[Feature][T106]ZXW P56U09 code
Only Configure: Yes
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: No
Doc Update: No
Change-Id: I3cbd8b420271eb20c2b40ebe5c78f83059cd42f3
diff --git a/ap/os/linux/linux-3.4.x/fs/xfs/xfs_bmap.c b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_bmap.c
new file mode 100644
index 0000000..85e7e32
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_bmap.c
@@ -0,0 +1,6159 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_types.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir2.h"
+#include "xfs_da_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_mount.h"
+#include "xfs_itable.h"
+#include "xfs_inode_item.h"
+#include "xfs_extfree_item.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_rw.h"
+#include "xfs_quota.h"
+#include "xfs_trans_space.h"
+#include "xfs_buf_item.h"
+#include "xfs_filestream.h"
+#include "xfs_vnodeops.h"
+#include "xfs_trace.h"
+
+
+kmem_zone_t *xfs_bmap_free_item_zone;
+
+/*
+ * Prototypes for internal bmap routines.
+ */
+
+#ifdef DEBUG
+STATIC void
+xfs_bmap_check_leaf_extents(
+ struct xfs_btree_cur *cur,
+ struct xfs_inode *ip,
+ int whichfork);
+#else
+#define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
+#endif
+
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle extents format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags); /* inode logging flags */
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle local format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_local(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags); /* inode logging flags */
+
+/*
+ * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
+ * It figures out where to ask the underlying allocator to put the new extent.
+ */
+STATIC int /* error */
+xfs_bmap_alloc(
+ xfs_bmalloca_t *ap); /* bmap alloc argument struct */
+
+/*
+ * Transform a btree format file with only one leaf node, where the
+ * extents list will fit in the inode, into an extents format file.
+ * Since the file extents are already in-core, all we have to do is
+ * give up the space for the btree root and pitch the leaf block.
+ */
+STATIC int /* error */
+xfs_bmap_btree_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_btree_cur_t *cur, /* btree cursor */
+ int *logflagsp, /* inode logging flags */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Remove the entry "free" from the free item list. Prev points to the
+ * previous entry, unless "free" is the head of the list.
+ */
+STATIC void
+xfs_bmap_del_free(
+ xfs_bmap_free_t *flist, /* free item list header */
+ xfs_bmap_free_item_t *prev, /* previous item on list, if any */
+ xfs_bmap_free_item_t *free); /* list item to be freed */
+
+/*
+ * Convert an extents-format file into a btree-format file.
+ * The new file will have a root block (in the inode) and a single child block.
+ */
+STATIC int /* error */
+xfs_bmap_extents_to_btree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first-block-allocated */
+ xfs_bmap_free_t *flist, /* blocks freed in xaction */
+ xfs_btree_cur_t **curp, /* cursor returned to caller */
+ int wasdel, /* converting a delayed alloc */
+ int *logflagsp, /* inode logging flags */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Convert a local file to an extents file.
+ * This code is sort of bogus, since the file data needs to get
+ * logged so it won't be lost. The bmap-level manipulations are ok, though.
+ */
+STATIC int /* error */
+xfs_bmap_local_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated in xaction */
+ xfs_extlen_t total, /* total blocks needed by transaction */
+ int *logflagsp, /* inode logging flags */
+ int whichfork); /* data or attr fork */
+
+/*
+ * Search the extents list for the inode, for the extent containing bno.
+ * If bno lies in a hole, point to the next entry. If bno lies past eof,
+ * *eofp will be set, and *prevp will contain the last entry (null if none).
+ * Else, *lastxp will be set to the index of the found
+ * entry; *gotp will contain the entry.
+ */
+STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
+xfs_bmap_search_extents(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fileoff_t bno, /* block number searched for */
+ int whichfork, /* data or attr fork */
+ int *eofp, /* out: end of file found */
+ xfs_extnum_t *lastxp, /* out: last extent index */
+ xfs_bmbt_irec_t *gotp, /* out: extent entry found */
+ xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
+
+/*
+ * Compute the worst-case number of indirect blocks that will be used
+ * for ip's delayed extent of length "len".
+ */
+STATIC xfs_filblks_t
+xfs_bmap_worst_indlen(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_filblks_t len); /* delayed extent length */
+
+#ifdef DEBUG
+/*
+ * Perform various validation checks on the values being returned
+ * from xfs_bmapi().
+ */
+STATIC void
+xfs_bmap_validate_ret(
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ int flags,
+ xfs_bmbt_irec_t *mval,
+ int nmap,
+ int ret_nmap);
+#else
+#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
+#endif /* DEBUG */
+
+STATIC int
+xfs_bmap_count_tree(
+ xfs_mount_t *mp,
+ xfs_trans_t *tp,
+ xfs_ifork_t *ifp,
+ xfs_fsblock_t blockno,
+ int levelin,
+ int *count);
+
+STATIC void
+xfs_bmap_count_leaves(
+ xfs_ifork_t *ifp,
+ xfs_extnum_t idx,
+ int numrecs,
+ int *count);
+
+STATIC void
+xfs_bmap_disk_count_leaves(
+ struct xfs_mount *mp,
+ struct xfs_btree_block *block,
+ int numrecs,
+ int *count);
+
+/*
+ * Bmap internal routines.
+ */
+
+STATIC int /* error */
+xfs_bmbt_lookup_eq(
+ struct xfs_btree_cur *cur,
+ xfs_fileoff_t off,
+ xfs_fsblock_t bno,
+ xfs_filblks_t len,
+ int *stat) /* success/failure */
+{
+ cur->bc_rec.b.br_startoff = off;
+ cur->bc_rec.b.br_startblock = bno;
+ cur->bc_rec.b.br_blockcount = len;
+ return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
+}
+
+STATIC int /* error */
+xfs_bmbt_lookup_ge(
+ struct xfs_btree_cur *cur,
+ xfs_fileoff_t off,
+ xfs_fsblock_t bno,
+ xfs_filblks_t len,
+ int *stat) /* success/failure */
+{
+ cur->bc_rec.b.br_startoff = off;
+ cur->bc_rec.b.br_startblock = bno;
+ cur->bc_rec.b.br_blockcount = len;
+ return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
+}
+
+/*
+ * Check if the inode needs to be converted to btree format.
+ */
+static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
+{
+ return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) >
+ XFS_IFORK_MAXEXT(ip, whichfork);
+}
+
+/*
+ * Check if the inode should be converted to extent format.
+ */
+static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
+{
+ return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) <=
+ XFS_IFORK_MAXEXT(ip, whichfork);
+}
+
+/*
+ * Update the record referred to by cur to the value given
+ * by [off, bno, len, state].
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+STATIC int
+xfs_bmbt_update(
+ struct xfs_btree_cur *cur,
+ xfs_fileoff_t off,
+ xfs_fsblock_t bno,
+ xfs_filblks_t len,
+ xfs_exntst_t state)
+{
+ union xfs_btree_rec rec;
+
+ xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
+ return xfs_btree_update(cur, &rec);
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle btree format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_btree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags) /* inode logging flags */
+{
+ xfs_btree_cur_t *cur; /* btree cursor */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* file system mount struct */
+ int stat; /* newroot status */
+
+ mp = ip->i_mount;
+ if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
+ *flags |= XFS_ILOG_DBROOT;
+ else {
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
+ cur->bc_private.b.flist = flist;
+ cur->bc_private.b.firstblock = *firstblock;
+ if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
+ goto error0;
+ /* must be at least one entry */
+ XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
+ if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
+ goto error0;
+ if (stat == 0) {
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ return XFS_ERROR(ENOSPC);
+ }
+ *firstblock = cur->bc_private.b.firstblock;
+ cur->bc_private.b.allocated = 0;
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ }
+ return 0;
+error0:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle extents format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags) /* inode logging flags */
+{
+ xfs_btree_cur_t *cur; /* bmap btree cursor */
+ int error; /* error return value */
+
+ if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
+ return 0;
+ cur = NULL;
+ error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
+ flags, XFS_DATA_FORK);
+ if (cur) {
+ cur->bc_private.b.allocated = 0;
+ xfs_btree_del_cursor(cur,
+ error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+ }
+ return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle local format files.
+ */
+STATIC int /* error */
+xfs_bmap_add_attrfork_local(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated */
+ xfs_bmap_free_t *flist, /* blocks to free at commit */
+ int *flags) /* inode logging flags */
+{
+ xfs_da_args_t dargs; /* args for dir/attr code */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* mount structure pointer */
+
+ if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
+ return 0;
+ if (S_ISDIR(ip->i_d.di_mode)) {
+ mp = ip->i_mount;
+ memset(&dargs, 0, sizeof(dargs));
+ dargs.dp = ip;
+ dargs.firstblock = firstblock;
+ dargs.flist = flist;
+ dargs.total = mp->m_dirblkfsbs;
+ dargs.whichfork = XFS_DATA_FORK;
+ dargs.trans = tp;
+ error = xfs_dir2_sf_to_block(&dargs);
+ } else
+ error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
+ XFS_DATA_FORK);
+ return error;
+}
+
+/*
+ * Convert a delayed allocation to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_delay_real(
+ struct xfs_bmalloca *bma)
+{
+ struct xfs_bmbt_irec *new = &bma->got;
+ int diff; /* temp value */
+ xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
+ int error; /* error return value */
+ int i; /* temp state */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_fileoff_t new_endoff; /* end offset of new entry */
+ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
+ /* left is 0, right is 1, prev is 2 */
+ int rval=0; /* return value (logging flags) */
+ int state = 0;/* state bits, accessed thru macros */
+ xfs_filblks_t da_new; /* new count del alloc blocks used */
+ xfs_filblks_t da_old; /* old count del alloc blocks used */
+ xfs_filblks_t temp=0; /* value for da_new calculations */
+ xfs_filblks_t temp2=0;/* value for da_new calculations */
+ int tmp_rval; /* partial logging flags */
+
+ ifp = XFS_IFORK_PTR(bma->ip, XFS_DATA_FORK);
+
+ ASSERT(bma->idx >= 0);
+ ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
+ ASSERT(!isnullstartblock(new->br_startblock));
+ ASSERT(!bma->cur ||
+ (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
+
+ XFS_STATS_INC(xs_add_exlist);
+
+#define LEFT r[0]
+#define RIGHT r[1]
+#define PREV r[2]
+
+ /*
+ * Set up a bunch of variables to make the tests simpler.
+ */
+ ep = xfs_iext_get_ext(ifp, bma->idx);
+ xfs_bmbt_get_all(ep, &PREV);
+ new_endoff = new->br_startoff + new->br_blockcount;
+ ASSERT(PREV.br_startoff <= new->br_startoff);
+ ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+
+ da_old = startblockval(PREV.br_startblock);
+ da_new = 0;
+
+ /*
+ * Set flags determining what part of the previous delayed allocation
+ * extent is being replaced by a real allocation.
+ */
+ if (PREV.br_startoff == new->br_startoff)
+ state |= BMAP_LEFT_FILLING;
+ if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
+ state |= BMAP_RIGHT_FILLING;
+
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ */
+ if (bma->idx > 0) {
+ state |= BMAP_LEFT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
+
+ if (isnullstartblock(LEFT.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
+ LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+ LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+ LEFT.br_state == new->br_state &&
+ LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ /*
+ * Check and set flags if this segment has a right neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ * Also check for all-three-contiguous being too large.
+ */
+ if (bma->idx < bma->ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
+ state |= BMAP_RIGHT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
+
+ if (isnullstartblock(RIGHT.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
+ new_endoff == RIGHT.br_startoff &&
+ new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
+ new->br_state == RIGHT.br_state &&
+ new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
+ ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING)) !=
+ (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING) ||
+ LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+ <= MAXEXTLEN))
+ state |= BMAP_RIGHT_CONTIG;
+
+ error = 0;
+ /*
+ * Switch out based on the FILLING and CONTIG state bits.
+ */
+ switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The left and right neighbors are both contiguous with new.
+ */
+ bma->idx--;
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
+ LEFT.br_blockcount + PREV.br_blockcount +
+ RIGHT.br_blockcount);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
+ bma->ip->i_d.di_nextents--;
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_btree_delete(bma->cur, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_btree_decrement(bma->cur, 0, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount +
+ PREV.br_blockcount +
+ RIGHT.br_blockcount, LEFT.br_state);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The left neighbor is contiguous, the right is not.
+ */
+ bma->idx--;
+
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
+ LEFT.br_blockcount + PREV.br_blockcount);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
+ LEFT.br_startblock, LEFT.br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount +
+ PREV.br_blockcount, LEFT.br_state);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * The right neighbor is contiguous, the left is not.
+ */
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_startblock(ep, new->br_startblock);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount + RIGHT.br_blockcount);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
+ new->br_startblock,
+ PREV.br_blockcount +
+ RIGHT.br_blockcount, PREV.br_state);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
+ /*
+ * Filling in all of a previously delayed allocation extent.
+ * Neither the left nor right neighbors are contiguous with
+ * the new one.
+ */
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_startblock(ep, new->br_startblock);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ bma->ip->i_d.di_nextents++;
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 0, done);
+ bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Filling in the first part of a previous delayed allocation.
+ * The left neighbor is contiguous.
+ */
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
+ LEFT.br_blockcount + new->br_blockcount);
+ xfs_bmbt_set_startoff(ep,
+ PREV.br_startoff + new->br_blockcount);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
+
+ temp = PREV.br_blockcount - new->br_blockcount;
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep, temp);
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
+ LEFT.br_startblock, LEFT.br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount +
+ new->br_blockcount,
+ LEFT.br_state);
+ if (error)
+ goto done;
+ }
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock));
+ xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ bma->idx--;
+ break;
+
+ case BMAP_LEFT_FILLING:
+ /*
+ * Filling in the first part of a previous delayed allocation.
+ * The left neighbor is not contiguous.
+ */
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_startoff(ep, new_endoff);
+ temp = PREV.br_blockcount - new->br_blockcount;
+ xfs_bmbt_set_blockcount(ep, temp);
+ xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
+ bma->ip->i_d.di_nextents++;
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 0, done);
+ bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+
+ if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ bma->firstblock, bma->flist,
+ &bma->cur, 1, &tmp_rval, XFS_DATA_FORK);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock) -
+ (bma->cur ? bma->cur->bc_private.b.allocated : 0));
+ ep = xfs_iext_get_ext(ifp, bma->idx + 1);
+ xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
+ trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
+ break;
+
+ case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Filling in the last part of a previous delayed allocation.
+ * The right neighbor is contiguous with the new allocation.
+ */
+ temp = PREV.br_blockcount - new->br_blockcount;
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep, temp);
+ xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
+ new->br_startoff, new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount,
+ RIGHT.br_state);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount +
+ RIGHT.br_blockcount,
+ RIGHT.br_state);
+ if (error)
+ goto done;
+ }
+
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock));
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ bma->idx++;
+ break;
+
+ case BMAP_RIGHT_FILLING:
+ /*
+ * Filling in the last part of a previous delayed allocation.
+ * The right neighbor is not contiguous.
+ */
+ temp = PREV.br_blockcount - new->br_blockcount;
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep, temp);
+ xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
+ bma->ip->i_d.di_nextents++;
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 0, done);
+ bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+
+ if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ bma->firstblock, bma->flist, &bma->cur, 1,
+ &tmp_rval, XFS_DATA_FORK);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock) -
+ (bma->cur ? bma->cur->bc_private.b.allocated : 0));
+ ep = xfs_iext_get_ext(ifp, bma->idx);
+ xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ bma->idx++;
+ break;
+
+ case 0:
+ /*
+ * Filling in the middle part of a previous delayed allocation.
+ * Contiguity is impossible here.
+ * This case is avoided almost all the time.
+ *
+ * We start with a delayed allocation:
+ *
+ * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
+ * PREV @ idx
+ *
+ * and we are allocating:
+ * +rrrrrrrrrrrrrrrrr+
+ * new
+ *
+ * and we set it up for insertion as:
+ * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
+ * new
+ * PREV @ idx LEFT RIGHT
+ * inserted at idx + 1
+ */
+ temp = new->br_startoff - PREV.br_startoff;
+ temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */
+ LEFT = *new;
+ RIGHT.br_state = PREV.br_state;
+ RIGHT.br_startblock = nullstartblock(
+ (int)xfs_bmap_worst_indlen(bma->ip, temp2));
+ RIGHT.br_startoff = new_endoff;
+ RIGHT.br_blockcount = temp2;
+ /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
+ xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
+ bma->ip->i_d.di_nextents++;
+ if (bma->cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 0, done);
+ bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+
+ if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ bma->firstblock, bma->flist, &bma->cur,
+ 1, &tmp_rval, XFS_DATA_FORK);
+ rval |= tmp_rval;
+ if (error)
+ goto done;
+ }
+ temp = xfs_bmap_worst_indlen(bma->ip, temp);
+ temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
+ diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
+ (bma->cur ? bma->cur->bc_private.b.allocated : 0));
+ if (diff > 0) {
+ error = xfs_icsb_modify_counters(bma->ip->i_mount,
+ XFS_SBS_FDBLOCKS,
+ -((int64_t)diff), 0);
+ ASSERT(!error);
+ if (error)
+ goto done;
+ }
+
+ ep = xfs_iext_get_ext(ifp, bma->idx);
+ xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
+ xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
+ nullstartblock((int)temp2));
+ trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
+
+ bma->idx++;
+ da_new = temp + temp2;
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_CONTIG:
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * These cases are all impossible.
+ */
+ ASSERT(0);
+ }
+
+ /* convert to a btree if necessary */
+ if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(bma->cur == NULL);
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ bma->firstblock, bma->flist, &bma->cur,
+ da_old > 0, &tmp_logflags, XFS_DATA_FORK);
+ bma->logflags |= tmp_logflags;
+ if (error)
+ goto done;
+ }
+
+ /* adjust for changes in reserved delayed indirect blocks */
+ if (da_old || da_new) {
+ temp = da_new;
+ if (bma->cur)
+ temp += bma->cur->bc_private.b.allocated;
+ ASSERT(temp <= da_old);
+ if (temp < da_old)
+ xfs_icsb_modify_counters(bma->ip->i_mount,
+ XFS_SBS_FDBLOCKS,
+ (int64_t)(da_old - temp), 0);
+ }
+
+ /* clear out the allocated field, done with it now in any case. */
+ if (bma->cur)
+ bma->cur->bc_private.b.allocated = 0;
+
+ xfs_bmap_check_leaf_extents(bma->cur, bma->ip, XFS_DATA_FORK);
+done:
+ bma->logflags |= rval;
+ return error;
+#undef LEFT
+#undef RIGHT
+#undef PREV
+}
+
+/*
+ * Convert an unwritten allocation to a real allocation or vice versa.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_unwritten_real(
+ struct xfs_trans *tp,
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t *idx, /* extent number to update/insert */
+ xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
+ xfs_bmbt_irec_t *new, /* new data to add to file extents */
+ xfs_fsblock_t *first, /* pointer to firstblock variable */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ int *logflagsp) /* inode logging flags */
+{
+ xfs_btree_cur_t *cur; /* btree cursor */
+ xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
+ int error; /* error return value */
+ int i; /* temp state */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_fileoff_t new_endoff; /* end offset of new entry */
+ xfs_exntst_t newext; /* new extent state */
+ xfs_exntst_t oldext; /* old extent state */
+ xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
+ /* left is 0, right is 1, prev is 2 */
+ int rval=0; /* return value (logging flags) */
+ int state = 0;/* state bits, accessed thru macros */
+
+ *logflagsp = 0;
+
+ cur = *curp;
+ ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+
+ ASSERT(*idx >= 0);
+ ASSERT(*idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
+ ASSERT(!isnullstartblock(new->br_startblock));
+
+ XFS_STATS_INC(xs_add_exlist);
+
+#define LEFT r[0]
+#define RIGHT r[1]
+#define PREV r[2]
+
+ /*
+ * Set up a bunch of variables to make the tests simpler.
+ */
+ error = 0;
+ ep = xfs_iext_get_ext(ifp, *idx);
+ xfs_bmbt_get_all(ep, &PREV);
+ newext = new->br_state;
+ oldext = (newext == XFS_EXT_UNWRITTEN) ?
+ XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
+ ASSERT(PREV.br_state == oldext);
+ new_endoff = new->br_startoff + new->br_blockcount;
+ ASSERT(PREV.br_startoff <= new->br_startoff);
+ ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+
+ /*
+ * Set flags determining what part of the previous oldext allocation
+ * extent is being replaced by a newext allocation.
+ */
+ if (PREV.br_startoff == new->br_startoff)
+ state |= BMAP_LEFT_FILLING;
+ if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
+ state |= BMAP_RIGHT_FILLING;
+
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ */
+ if (*idx > 0) {
+ state |= BMAP_LEFT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
+
+ if (isnullstartblock(LEFT.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
+ LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+ LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+ LEFT.br_state == newext &&
+ LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ /*
+ * Check and set flags if this segment has a right neighbor.
+ * Don't set contiguous if the combined extent would be too large.
+ * Also check for all-three-contiguous being too large.
+ */
+ if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
+ state |= BMAP_RIGHT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
+ if (isnullstartblock(RIGHT.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
+ new_endoff == RIGHT.br_startoff &&
+ new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
+ newext == RIGHT.br_state &&
+ new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
+ ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING)) !=
+ (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
+ BMAP_RIGHT_FILLING) ||
+ LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+ <= MAXEXTLEN))
+ state |= BMAP_RIGHT_CONTIG;
+
+ /*
+ * Switch out based on the FILLING and CONTIG state bits.
+ */
+ switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
+ BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The left and right neighbors are both contiguous with new.
+ */
+ --*idx;
+
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
+ LEFT.br_blockcount + PREV.br_blockcount +
+ RIGHT.br_blockcount);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ xfs_iext_remove(ip, *idx + 1, 2, state);
+ ip->i_d.di_nextents -= 2;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount + PREV.br_blockcount +
+ RIGHT.br_blockcount, LEFT.br_state)))
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The left neighbor is contiguous, the right is not.
+ */
+ --*idx;
+
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
+ LEFT.br_blockcount + PREV.br_blockcount);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ xfs_iext_remove(ip, *idx + 1, 1, state);
+ ip->i_d.di_nextents--;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount + PREV.br_blockcount,
+ LEFT.br_state)))
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * The right neighbor is contiguous, the left is not.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount + RIGHT.br_blockcount);
+ xfs_bmbt_set_state(ep, newext);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ xfs_iext_remove(ip, *idx + 1, 1, state);
+ ip->i_d.di_nextents--;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount,
+ newext)))
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
+ /*
+ * Setting all of a previous oldext extent to newext.
+ * Neither the left nor right neighbors are contiguous with
+ * the new one.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_state(ep, newext);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ newext)))
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
+ /*
+ * Setting the first part of a previous oldext extent to newext.
+ * The left neighbor is contiguous.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
+ LEFT.br_blockcount + new->br_blockcount);
+ xfs_bmbt_set_startoff(ep,
+ PREV.br_startoff + new->br_blockcount);
+ trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
+
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_startblock(ep,
+ new->br_startblock + new->br_blockcount);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ --*idx;
+
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur,
+ PREV.br_startoff + new->br_blockcount,
+ PREV.br_startblock + new->br_blockcount,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ if ((error = xfs_btree_decrement(cur, 0, &i)))
+ goto done;
+ error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock,
+ LEFT.br_blockcount + new->br_blockcount,
+ LEFT.br_state);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_FILLING:
+ /*
+ * Setting the first part of a previous oldext extent to newext.
+ * The left neighbor is not contiguous.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
+ xfs_bmbt_set_startoff(ep, new_endoff);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ xfs_bmbt_set_startblock(ep,
+ new->br_startblock + new->br_blockcount);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ xfs_iext_insert(ip, *idx, 1, new, state);
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur,
+ PREV.br_startoff + new->br_blockcount,
+ PREV.br_startblock + new->br_blockcount,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ cur->bc_rec.b = *new;
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+ break;
+
+ case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
+ /*
+ * Setting the last part of a previous oldext extent to newext.
+ * The right neighbor is contiguous with the new allocation.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ ++*idx;
+
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
+ new->br_startoff, new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount, newext);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ if (cur == NULL)
+ rval = XFS_ILOG_DEXT;
+ else {
+ rval = 0;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock,
+ PREV.br_blockcount, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ if ((error = xfs_btree_increment(cur, 0, &i)))
+ goto done;
+ if ((error = xfs_bmbt_update(cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount + RIGHT.br_blockcount,
+ newext)))
+ goto done;
+ }
+ break;
+
+ case BMAP_RIGHT_FILLING:
+ /*
+ * Setting the last part of a previous oldext extent to newext.
+ * The right neighbor is not contiguous.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep,
+ PREV.br_blockcount - new->br_blockcount);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ ++*idx;
+ xfs_iext_insert(ip, *idx, 1, new, state);
+
+ ip->i_d.di_nextents++;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock,
+ PREV.br_blockcount - new->br_blockcount,
+ oldext)))
+ goto done;
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 0, done);
+ cur->bc_rec.b.br_state = XFS_EXT_NORM;
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+ break;
+
+ case 0:
+ /*
+ * Setting the middle part of a previous oldext extent to
+ * newext. Contiguity is impossible here.
+ * One extent becomes three extents.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep,
+ new->br_startoff - PREV.br_startoff);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ r[0] = *new;
+ r[1].br_startoff = new_endoff;
+ r[1].br_blockcount =
+ PREV.br_startoff + PREV.br_blockcount - new_endoff;
+ r[1].br_startblock = new->br_startblock + new->br_blockcount;
+ r[1].br_state = oldext;
+
+ ++*idx;
+ xfs_iext_insert(ip, *idx, 2, &r[0], state);
+
+ ip->i_d.di_nextents += 2;
+ if (cur == NULL)
+ rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+ else {
+ rval = XFS_ILOG_CORE;
+ if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ /* new right extent - oldext */
+ if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
+ r[1].br_startblock, r[1].br_blockcount,
+ r[1].br_state)))
+ goto done;
+ /* new left extent - oldext */
+ cur->bc_rec.b = PREV;
+ cur->bc_rec.b.br_blockcount =
+ new->br_startoff - PREV.br_startoff;
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ /*
+ * Reset the cursor to the position of the new extent
+ * we are about to insert as we can't trust it after
+ * the previous insert.
+ */
+ if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+ new->br_startblock, new->br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 0, done);
+ /* new middle extent - newext */
+ cur->bc_rec.b.br_state = new->br_state;
+ if ((error = xfs_btree_insert(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+ break;
+
+ case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
+ case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ case BMAP_LEFT_CONTIG:
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * These cases are all impossible.
+ */
+ ASSERT(0);
+ }
+
+ /* convert to a btree if necessary */
+ if (xfs_bmap_needs_btree(ip, XFS_DATA_FORK)) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(tp, ip, first, flist, &cur,
+ 0, &tmp_logflags, XFS_DATA_FORK);
+ *logflagsp |= tmp_logflags;
+ if (error)
+ goto done;
+ }
+
+ /* clear out the allocated field, done with it now in any case. */
+ if (cur) {
+ cur->bc_private.b.allocated = 0;
+ *curp = cur;
+ }
+
+ xfs_bmap_check_leaf_extents(*curp, ip, XFS_DATA_FORK);
+done:
+ *logflagsp |= rval;
+ return error;
+#undef LEFT
+#undef RIGHT
+#undef PREV
+}
+
+/*
+ * Convert a hole to a delayed allocation.
+ */
+STATIC void
+xfs_bmap_add_extent_hole_delay(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t *idx, /* extent number to update/insert */
+ xfs_bmbt_irec_t *new) /* new data to add to file extents */
+{
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_irec_t left; /* left neighbor extent entry */
+ xfs_filblks_t newlen=0; /* new indirect size */
+ xfs_filblks_t oldlen=0; /* old indirect size */
+ xfs_bmbt_irec_t right; /* right neighbor extent entry */
+ int state; /* state bits, accessed thru macros */
+ xfs_filblks_t temp=0; /* temp for indirect calculations */
+
+ ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ state = 0;
+ ASSERT(isnullstartblock(new->br_startblock));
+
+ /*
+ * Check and set flags if this segment has a left neighbor
+ */
+ if (*idx > 0) {
+ state |= BMAP_LEFT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
+
+ if (isnullstartblock(left.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ /*
+ * Check and set flags if the current (right) segment exists.
+ * If it doesn't exist, we're converting the hole at end-of-file.
+ */
+ if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
+ state |= BMAP_RIGHT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
+
+ if (isnullstartblock(right.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ /*
+ * Set contiguity flags on the left and right neighbors.
+ * Don't let extents get too large, even if the pieces are contiguous.
+ */
+ if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
+ left.br_startoff + left.br_blockcount == new->br_startoff &&
+ left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
+ new->br_startoff + new->br_blockcount == right.br_startoff &&
+ new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
+ (!(state & BMAP_LEFT_CONTIG) ||
+ (left.br_blockcount + new->br_blockcount +
+ right.br_blockcount <= MAXEXTLEN)))
+ state |= BMAP_RIGHT_CONTIG;
+
+ /*
+ * Switch out based on the contiguity flags.
+ */
+ switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with delayed allocations
+ * on the left and on the right.
+ * Merge all three into a single extent record.
+ */
+ --*idx;
+ temp = left.br_blockcount + new->br_blockcount +
+ right.br_blockcount;
+
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
+ oldlen = startblockval(left.br_startblock) +
+ startblockval(new->br_startblock) +
+ startblockval(right.br_startblock);
+ newlen = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
+ nullstartblock((int)newlen));
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
+ xfs_iext_remove(ip, *idx + 1, 1, state);
+ break;
+
+ case BMAP_LEFT_CONTIG:
+ /*
+ * New allocation is contiguous with a delayed allocation
+ * on the left.
+ * Merge the new allocation with the left neighbor.
+ */
+ --*idx;
+ temp = left.br_blockcount + new->br_blockcount;
+
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
+ oldlen = startblockval(left.br_startblock) +
+ startblockval(new->br_startblock);
+ newlen = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
+ nullstartblock((int)newlen));
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ break;
+
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with a delayed allocation
+ * on the right.
+ * Merge the new allocation with the right neighbor.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ temp = new->br_blockcount + right.br_blockcount;
+ oldlen = startblockval(new->br_startblock) +
+ startblockval(right.br_startblock);
+ newlen = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
+ new->br_startoff,
+ nullstartblock((int)newlen), temp, right.br_state);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ break;
+
+ case 0:
+ /*
+ * New allocation is not contiguous with another
+ * delayed allocation.
+ * Insert a new entry.
+ */
+ oldlen = newlen = 0;
+ xfs_iext_insert(ip, *idx, 1, new, state);
+ break;
+ }
+ if (oldlen != newlen) {
+ ASSERT(oldlen > newlen);
+ xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
+ (int64_t)(oldlen - newlen), 0);
+ /*
+ * Nothing to do for disk quota accounting here.
+ */
+ }
+}
+
+/*
+ * Convert a hole to a real allocation.
+ */
+STATIC int /* error */
+xfs_bmap_add_extent_hole_real(
+ struct xfs_bmalloca *bma,
+ int whichfork)
+{
+ struct xfs_bmbt_irec *new = &bma->got;
+ int error; /* error return value */
+ int i; /* temp state */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_irec_t left; /* left neighbor extent entry */
+ xfs_bmbt_irec_t right; /* right neighbor extent entry */
+ int rval=0; /* return value (logging flags) */
+ int state; /* state bits, accessed thru macros */
+
+ ifp = XFS_IFORK_PTR(bma->ip, whichfork);
+
+ ASSERT(bma->idx >= 0);
+ ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
+ ASSERT(!isnullstartblock(new->br_startblock));
+ ASSERT(!bma->cur ||
+ !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
+
+ XFS_STATS_INC(xs_add_exlist);
+
+ state = 0;
+ if (whichfork == XFS_ATTR_FORK)
+ state |= BMAP_ATTRFORK;
+
+ /*
+ * Check and set flags if this segment has a left neighbor.
+ */
+ if (bma->idx > 0) {
+ state |= BMAP_LEFT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left);
+ if (isnullstartblock(left.br_startblock))
+ state |= BMAP_LEFT_DELAY;
+ }
+
+ /*
+ * Check and set flags if this segment has a current value.
+ * Not true if we're inserting into the "hole" at eof.
+ */
+ if (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
+ state |= BMAP_RIGHT_VALID;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right);
+ if (isnullstartblock(right.br_startblock))
+ state |= BMAP_RIGHT_DELAY;
+ }
+
+ /*
+ * We're inserting a real allocation between "left" and "right".
+ * Set the contiguity flags. Don't let extents get too large.
+ */
+ if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
+ left.br_startoff + left.br_blockcount == new->br_startoff &&
+ left.br_startblock + left.br_blockcount == new->br_startblock &&
+ left.br_state == new->br_state &&
+ left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
+ state |= BMAP_LEFT_CONTIG;
+
+ if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
+ new->br_startoff + new->br_blockcount == right.br_startoff &&
+ new->br_startblock + new->br_blockcount == right.br_startblock &&
+ new->br_state == right.br_state &&
+ new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
+ (!(state & BMAP_LEFT_CONTIG) ||
+ left.br_blockcount + new->br_blockcount +
+ right.br_blockcount <= MAXEXTLEN))
+ state |= BMAP_RIGHT_CONTIG;
+
+ error = 0;
+ /*
+ * Select which case we're in here, and implement it.
+ */
+ switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
+ case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with real allocations on the
+ * left and on the right.
+ * Merge all three into a single extent record.
+ */
+ --bma->idx;
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
+ left.br_blockcount + new->br_blockcount +
+ right.br_blockcount);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
+
+ XFS_IFORK_NEXT_SET(bma->ip, whichfork,
+ XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1);
+ if (bma->cur == NULL) {
+ rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
+ } else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff,
+ right.br_startblock, right.br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_btree_delete(bma->cur, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_btree_decrement(bma->cur, 0, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, left.br_startoff,
+ left.br_startblock,
+ left.br_blockcount +
+ new->br_blockcount +
+ right.br_blockcount,
+ left.br_state);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_LEFT_CONTIG:
+ /*
+ * New allocation is contiguous with a real allocation
+ * on the left.
+ * Merge the new allocation with the left neighbor.
+ */
+ --bma->idx;
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
+ left.br_blockcount + new->br_blockcount);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ if (bma->cur == NULL) {
+ rval = xfs_ilog_fext(whichfork);
+ } else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff,
+ left.br_startblock, left.br_blockcount,
+ &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, left.br_startoff,
+ left.br_startblock,
+ left.br_blockcount +
+ new->br_blockcount,
+ left.br_state);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case BMAP_RIGHT_CONTIG:
+ /*
+ * New allocation is contiguous with a real allocation
+ * on the right.
+ * Merge the new allocation with the right neighbor.
+ */
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx),
+ new->br_startoff, new->br_startblock,
+ new->br_blockcount + right.br_blockcount,
+ right.br_state);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
+ if (bma->cur == NULL) {
+ rval = xfs_ilog_fext(whichfork);
+ } else {
+ rval = 0;
+ error = xfs_bmbt_lookup_eq(bma->cur,
+ right.br_startoff,
+ right.br_startblock,
+ right.br_blockcount, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ error = xfs_bmbt_update(bma->cur, new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount +
+ right.br_blockcount,
+ right.br_state);
+ if (error)
+ goto done;
+ }
+ break;
+
+ case 0:
+ /*
+ * New allocation is not contiguous with another
+ * real allocation.
+ * Insert a new entry.
+ */
+ xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
+ XFS_IFORK_NEXT_SET(bma->ip, whichfork,
+ XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1);
+ if (bma->cur == NULL) {
+ rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
+ } else {
+ rval = XFS_ILOG_CORE;
+ error = xfs_bmbt_lookup_eq(bma->cur,
+ new->br_startoff,
+ new->br_startblock,
+ new->br_blockcount, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 0, done);
+ bma->cur->bc_rec.b.br_state = new->br_state;
+ error = xfs_btree_insert(bma->cur, &i);
+ if (error)
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+ break;
+ }
+
+ /* convert to a btree if necessary */
+ if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
+ int tmp_logflags; /* partial log flag return val */
+
+ ASSERT(bma->cur == NULL);
+ error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
+ bma->firstblock, bma->flist, &bma->cur,
+ 0, &tmp_logflags, whichfork);
+ bma->logflags |= tmp_logflags;
+ if (error)
+ goto done;
+ }
+
+ /* clear out the allocated field, done with it now in any case. */
+ if (bma->cur)
+ bma->cur->bc_private.b.allocated = 0;
+
+ xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
+done:
+ bma->logflags |= rval;
+ return error;
+}
+
+/*
+ * Adjust the size of the new extent based on di_extsize and rt extsize.
+ */
+STATIC int
+xfs_bmap_extsize_align(
+ xfs_mount_t *mp,
+ xfs_bmbt_irec_t *gotp, /* next extent pointer */
+ xfs_bmbt_irec_t *prevp, /* previous extent pointer */
+ xfs_extlen_t extsz, /* align to this extent size */
+ int rt, /* is this a realtime inode? */
+ int eof, /* is extent at end-of-file? */
+ int delay, /* creating delalloc extent? */
+ int convert, /* overwriting unwritten extent? */
+ xfs_fileoff_t *offp, /* in/out: aligned offset */
+ xfs_extlen_t *lenp) /* in/out: aligned length */
+{
+ xfs_fileoff_t orig_off; /* original offset */
+ xfs_extlen_t orig_alen; /* original length */
+ xfs_fileoff_t orig_end; /* original off+len */
+ xfs_fileoff_t nexto; /* next file offset */
+ xfs_fileoff_t prevo; /* previous file offset */
+ xfs_fileoff_t align_off; /* temp for offset */
+ xfs_extlen_t align_alen; /* temp for length */
+ xfs_extlen_t temp; /* temp for calculations */
+
+ if (convert)
+ return 0;
+
+ orig_off = align_off = *offp;
+ orig_alen = align_alen = *lenp;
+ orig_end = orig_off + orig_alen;
+
+ /*
+ * If this request overlaps an existing extent, then don't
+ * attempt to perform any additional alignment.
+ */
+ if (!delay && !eof &&
+ (orig_off >= gotp->br_startoff) &&
+ (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
+ return 0;
+ }
+
+ /*
+ * If the file offset is unaligned vs. the extent size
+ * we need to align it. This will be possible unless
+ * the file was previously written with a kernel that didn't
+ * perform this alignment, or if a truncate shot us in the
+ * foot.
+ */
+ temp = do_mod(orig_off, extsz);
+ if (temp) {
+ align_alen += temp;
+ align_off -= temp;
+ }
+ /*
+ * Same adjustment for the end of the requested area.
+ */
+ if ((temp = (align_alen % extsz))) {
+ align_alen += extsz - temp;
+ }
+ /*
+ * If the previous block overlaps with this proposed allocation
+ * then move the start forward without adjusting the length.
+ */
+ if (prevp->br_startoff != NULLFILEOFF) {
+ if (prevp->br_startblock == HOLESTARTBLOCK)
+ prevo = prevp->br_startoff;
+ else
+ prevo = prevp->br_startoff + prevp->br_blockcount;
+ } else
+ prevo = 0;
+ if (align_off != orig_off && align_off < prevo)
+ align_off = prevo;
+ /*
+ * If the next block overlaps with this proposed allocation
+ * then move the start back without adjusting the length,
+ * but not before offset 0.
+ * This may of course make the start overlap previous block,
+ * and if we hit the offset 0 limit then the next block
+ * can still overlap too.
+ */
+ if (!eof && gotp->br_startoff != NULLFILEOFF) {
+ if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
+ (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
+ nexto = gotp->br_startoff + gotp->br_blockcount;
+ else
+ nexto = gotp->br_startoff;
+ } else
+ nexto = NULLFILEOFF;
+ if (!eof &&
+ align_off + align_alen != orig_end &&
+ align_off + align_alen > nexto)
+ align_off = nexto > align_alen ? nexto - align_alen : 0;
+ /*
+ * If we're now overlapping the next or previous extent that
+ * means we can't fit an extsz piece in this hole. Just move
+ * the start forward to the first valid spot and set
+ * the length so we hit the end.
+ */
+ if (align_off != orig_off && align_off < prevo)
+ align_off = prevo;
+ if (align_off + align_alen != orig_end &&
+ align_off + align_alen > nexto &&
+ nexto != NULLFILEOFF) {
+ ASSERT(nexto > prevo);
+ align_alen = nexto - align_off;
+ }
+
+ /*
+ * If realtime, and the result isn't a multiple of the realtime
+ * extent size we need to remove blocks until it is.
+ */
+ if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
+ /*
+ * We're not covering the original request, or
+ * we won't be able to once we fix the length.
+ */
+ if (orig_off < align_off ||
+ orig_end > align_off + align_alen ||
+ align_alen - temp < orig_alen)
+ return XFS_ERROR(EINVAL);
+ /*
+ * Try to fix it by moving the start up.
+ */
+ if (align_off + temp <= orig_off) {
+ align_alen -= temp;
+ align_off += temp;
+ }
+ /*
+ * Try to fix it by moving the end in.
+ */
+ else if (align_off + align_alen - temp >= orig_end)
+ align_alen -= temp;
+ /*
+ * Set the start to the minimum then trim the length.
+ */
+ else {
+ align_alen -= orig_off - align_off;
+ align_off = orig_off;
+ align_alen -= align_alen % mp->m_sb.sb_rextsize;
+ }
+ /*
+ * Result doesn't cover the request, fail it.
+ */
+ if (orig_off < align_off || orig_end > align_off + align_alen)
+ return XFS_ERROR(EINVAL);
+ } else {
+ ASSERT(orig_off >= align_off);
+ ASSERT(orig_end <= align_off + align_alen);
+ }
+
+#ifdef DEBUG
+ if (!eof && gotp->br_startoff != NULLFILEOFF)
+ ASSERT(align_off + align_alen <= gotp->br_startoff);
+ if (prevp->br_startoff != NULLFILEOFF)
+ ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
+#endif
+
+ *lenp = align_alen;
+ *offp = align_off;
+ return 0;
+}
+
+#define XFS_ALLOC_GAP_UNITS 4
+
+STATIC void
+xfs_bmap_adjacent(
+ xfs_bmalloca_t *ap) /* bmap alloc argument struct */
+{
+ xfs_fsblock_t adjust; /* adjustment to block numbers */
+ xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
+ xfs_mount_t *mp; /* mount point structure */
+ int nullfb; /* true if ap->firstblock isn't set */
+ int rt; /* true if inode is realtime */
+
+#define ISVALID(x,y) \
+ (rt ? \
+ (x) < mp->m_sb.sb_rblocks : \
+ XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
+ XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
+ XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
+
+ mp = ap->ip->i_mount;
+ nullfb = *ap->firstblock == NULLFSBLOCK;
+ rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
+ fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
+ /*
+ * If allocating at eof, and there's a previous real block,
+ * try to use its last block as our starting point.
+ */
+ if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
+ !isnullstartblock(ap->prev.br_startblock) &&
+ ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
+ ap->prev.br_startblock)) {
+ ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
+ /*
+ * Adjust for the gap between prevp and us.
+ */
+ adjust = ap->offset -
+ (ap->prev.br_startoff + ap->prev.br_blockcount);
+ if (adjust &&
+ ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
+ ap->blkno += adjust;
+ }
+ /*
+ * If not at eof, then compare the two neighbor blocks.
+ * Figure out whether either one gives us a good starting point,
+ * and pick the better one.
+ */
+ else if (!ap->eof) {
+ xfs_fsblock_t gotbno; /* right side block number */
+ xfs_fsblock_t gotdiff=0; /* right side difference */
+ xfs_fsblock_t prevbno; /* left side block number */
+ xfs_fsblock_t prevdiff=0; /* left side difference */
+
+ /*
+ * If there's a previous (left) block, select a requested
+ * start block based on it.
+ */
+ if (ap->prev.br_startoff != NULLFILEOFF &&
+ !isnullstartblock(ap->prev.br_startblock) &&
+ (prevbno = ap->prev.br_startblock +
+ ap->prev.br_blockcount) &&
+ ISVALID(prevbno, ap->prev.br_startblock)) {
+ /*
+ * Calculate gap to end of previous block.
+ */
+ adjust = prevdiff = ap->offset -
+ (ap->prev.br_startoff +
+ ap->prev.br_blockcount);
+ /*
+ * Figure the startblock based on the previous block's
+ * end and the gap size.
+ * Heuristic!
+ * If the gap is large relative to the piece we're
+ * allocating, or using it gives us an invalid block
+ * number, then just use the end of the previous block.
+ */
+ if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
+ ISVALID(prevbno + prevdiff,
+ ap->prev.br_startblock))
+ prevbno += adjust;
+ else
+ prevdiff += adjust;
+ /*
+ * If the firstblock forbids it, can't use it,
+ * must use default.
+ */
+ if (!rt && !nullfb &&
+ XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
+ prevbno = NULLFSBLOCK;
+ }
+ /*
+ * No previous block or can't follow it, just default.
+ */
+ else
+ prevbno = NULLFSBLOCK;
+ /*
+ * If there's a following (right) block, select a requested
+ * start block based on it.
+ */
+ if (!isnullstartblock(ap->got.br_startblock)) {
+ /*
+ * Calculate gap to start of next block.
+ */
+ adjust = gotdiff = ap->got.br_startoff - ap->offset;
+ /*
+ * Figure the startblock based on the next block's
+ * start and the gap size.
+ */
+ gotbno = ap->got.br_startblock;
+ /*
+ * Heuristic!
+ * If the gap is large relative to the piece we're
+ * allocating, or using it gives us an invalid block
+ * number, then just use the start of the next block
+ * offset by our length.
+ */
+ if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
+ ISVALID(gotbno - gotdiff, gotbno))
+ gotbno -= adjust;
+ else if (ISVALID(gotbno - ap->length, gotbno)) {
+ gotbno -= ap->length;
+ gotdiff += adjust - ap->length;
+ } else
+ gotdiff += adjust;
+ /*
+ * If the firstblock forbids it, can't use it,
+ * must use default.
+ */
+ if (!rt && !nullfb &&
+ XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
+ gotbno = NULLFSBLOCK;
+ }
+ /*
+ * No next block, just default.
+ */
+ else
+ gotbno = NULLFSBLOCK;
+ /*
+ * If both valid, pick the better one, else the only good
+ * one, else ap->blkno is already set (to 0 or the inode block).
+ */
+ if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
+ ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
+ else if (prevbno != NULLFSBLOCK)
+ ap->blkno = prevbno;
+ else if (gotbno != NULLFSBLOCK)
+ ap->blkno = gotbno;
+ }
+#undef ISVALID
+}
+
+STATIC int
+xfs_bmap_rtalloc(
+ xfs_bmalloca_t *ap) /* bmap alloc argument struct */
+{
+ xfs_alloctype_t atype = 0; /* type for allocation routines */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* mount point structure */
+ xfs_extlen_t prod = 0; /* product factor for allocators */
+ xfs_extlen_t ralen = 0; /* realtime allocation length */
+ xfs_extlen_t align; /* minimum allocation alignment */
+ xfs_rtblock_t rtb;
+
+ mp = ap->ip->i_mount;
+ align = xfs_get_extsz_hint(ap->ip);
+ prod = align / mp->m_sb.sb_rextsize;
+ error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
+ align, 1, ap->eof, 0,
+ ap->conv, &ap->offset, &ap->length);
+ if (error)
+ return error;
+ ASSERT(ap->length);
+ ASSERT(ap->length % mp->m_sb.sb_rextsize == 0);
+
+ /*
+ * If the offset & length are not perfectly aligned
+ * then kill prod, it will just get us in trouble.
+ */
+ if (do_mod(ap->offset, align) || ap->length % align)
+ prod = 1;
+ /*
+ * Set ralen to be the actual requested length in rtextents.
+ */
+ ralen = ap->length / mp->m_sb.sb_rextsize;
+ /*
+ * If the old value was close enough to MAXEXTLEN that
+ * we rounded up to it, cut it back so it's valid again.
+ * Note that if it's a really large request (bigger than
+ * MAXEXTLEN), we don't hear about that number, and can't
+ * adjust the starting point to match it.
+ */
+ if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
+ ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
+
+ /*
+ * Lock out other modifications to the RT bitmap inode.
+ */
+ xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
+
+ /*
+ * If it's an allocation to an empty file at offset 0,
+ * pick an extent that will space things out in the rt area.
+ */
+ if (ap->eof && ap->offset == 0) {
+ xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
+
+ error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
+ if (error)
+ return error;
+ ap->blkno = rtx * mp->m_sb.sb_rextsize;
+ } else {
+ ap->blkno = 0;
+ }
+
+ xfs_bmap_adjacent(ap);
+
+ /*
+ * Realtime allocation, done through xfs_rtallocate_extent.
+ */
+ atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
+ do_div(ap->blkno, mp->m_sb.sb_rextsize);
+ rtb = ap->blkno;
+ ap->length = ralen;
+ if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length,
+ &ralen, atype, ap->wasdel, prod, &rtb)))
+ return error;
+ if (rtb == NULLFSBLOCK && prod > 1 &&
+ (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1,
+ ap->length, &ralen, atype,
+ ap->wasdel, 1, &rtb)))
+ return error;
+ ap->blkno = rtb;
+ if (ap->blkno != NULLFSBLOCK) {
+ ap->blkno *= mp->m_sb.sb_rextsize;
+ ralen *= mp->m_sb.sb_rextsize;
+ ap->length = ralen;
+ ap->ip->i_d.di_nblocks += ralen;
+ xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
+ if (ap->wasdel)
+ ap->ip->i_delayed_blks -= ralen;
+ /*
+ * Adjust the disk quota also. This was reserved
+ * earlier.
+ */
+ xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
+ ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
+ XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
+ } else {
+ ap->length = 0;
+ }
+ return 0;
+}
+
+STATIC int
+xfs_bmap_btalloc_nullfb(
+ struct xfs_bmalloca *ap,
+ struct xfs_alloc_arg *args,
+ xfs_extlen_t *blen)
+{
+ struct xfs_mount *mp = ap->ip->i_mount;
+ struct xfs_perag *pag;
+ xfs_agnumber_t ag, startag;
+ int notinit = 0;
+ int error;
+
+ if (ap->userdata && xfs_inode_is_filestream(ap->ip))
+ args->type = XFS_ALLOCTYPE_NEAR_BNO;
+ else
+ args->type = XFS_ALLOCTYPE_START_BNO;
+ args->total = ap->total;
+
+ /*
+ * Search for an allocation group with a single extent large enough
+ * for the request. If one isn't found, then adjust the minimum
+ * allocation size to the largest space found.
+ */
+ startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
+ if (startag == NULLAGNUMBER)
+ startag = ag = 0;
+
+ pag = xfs_perag_get(mp, ag);
+ while (*blen < args->maxlen) {
+ if (!pag->pagf_init) {
+ error = xfs_alloc_pagf_init(mp, args->tp, ag,
+ XFS_ALLOC_FLAG_TRYLOCK);
+ if (error) {
+ xfs_perag_put(pag);
+ return error;
+ }
+ }
+
+ /*
+ * See xfs_alloc_fix_freelist...
+ */
+ if (pag->pagf_init) {
+ xfs_extlen_t longest;
+ longest = xfs_alloc_longest_free_extent(mp, pag);
+ if (*blen < longest)
+ *blen = longest;
+ } else
+ notinit = 1;
+
+ if (xfs_inode_is_filestream(ap->ip)) {
+ if (*blen >= args->maxlen)
+ break;
+
+ if (ap->userdata) {
+ /*
+ * If startag is an invalid AG, we've
+ * come here once before and
+ * xfs_filestream_new_ag picked the
+ * best currently available.
+ *
+ * Don't continue looping, since we
+ * could loop forever.
+ */
+ if (startag == NULLAGNUMBER)
+ break;
+
+ error = xfs_filestream_new_ag(ap, &ag);
+ xfs_perag_put(pag);
+ if (error)
+ return error;
+
+ /* loop again to set 'blen'*/
+ startag = NULLAGNUMBER;
+ pag = xfs_perag_get(mp, ag);
+ continue;
+ }
+ }
+ if (++ag == mp->m_sb.sb_agcount)
+ ag = 0;
+ if (ag == startag)
+ break;
+ xfs_perag_put(pag);
+ pag = xfs_perag_get(mp, ag);
+ }
+ xfs_perag_put(pag);
+
+ /*
+ * Since the above loop did a BUF_TRYLOCK, it is
+ * possible that there is space for this request.
+ */
+ if (notinit || *blen < ap->minlen)
+ args->minlen = ap->minlen;
+ /*
+ * If the best seen length is less than the request
+ * length, use the best as the minimum.
+ */
+ else if (*blen < args->maxlen)
+ args->minlen = *blen;
+ /*
+ * Otherwise we've seen an extent as big as maxlen,
+ * use that as the minimum.
+ */
+ else
+ args->minlen = args->maxlen;
+
+ /*
+ * set the failure fallback case to look in the selected
+ * AG as the stream may have moved.
+ */
+ if (xfs_inode_is_filestream(ap->ip))
+ ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
+
+ return 0;
+}
+
+STATIC int
+xfs_bmap_btalloc(
+ xfs_bmalloca_t *ap) /* bmap alloc argument struct */
+{
+ xfs_mount_t *mp; /* mount point structure */
+ xfs_alloctype_t atype = 0; /* type for allocation routines */
+ xfs_extlen_t align; /* minimum allocation alignment */
+ xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
+ xfs_agnumber_t ag;
+ xfs_alloc_arg_t args;
+ xfs_extlen_t blen;
+ xfs_extlen_t nextminlen = 0;
+ int nullfb; /* true if ap->firstblock isn't set */
+ int isaligned;
+ int tryagain;
+ int error;
+
+ ASSERT(ap->length);
+
+ mp = ap->ip->i_mount;
+ align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
+ if (unlikely(align)) {
+ error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
+ align, 0, ap->eof, 0, ap->conv,
+ &ap->offset, &ap->length);
+ ASSERT(!error);
+ ASSERT(ap->length);
+ }
+ nullfb = *ap->firstblock == NULLFSBLOCK;
+ fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
+ if (nullfb) {
+ if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
+ ag = xfs_filestream_lookup_ag(ap->ip);
+ ag = (ag != NULLAGNUMBER) ? ag : 0;
+ ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
+ } else {
+ ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
+ }
+ } else
+ ap->blkno = *ap->firstblock;
+
+ xfs_bmap_adjacent(ap);
+
+ /*
+ * If allowed, use ap->blkno; otherwise must use firstblock since
+ * it's in the right allocation group.
+ */
+ if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
+ ;
+ else
+ ap->blkno = *ap->firstblock;
+ /*
+ * Normal allocation, done through xfs_alloc_vextent.
+ */
+ tryagain = isaligned = 0;
+ args.tp = ap->tp;
+ args.mp = mp;
+ args.fsbno = ap->blkno;
+
+ /* Trim the allocation back to the maximum an AG can fit. */
+ args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
+ args.firstblock = *ap->firstblock;
+ blen = 0;
+ if (nullfb) {
+ error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
+ if (error)
+ return error;
+ } else if (ap->flist->xbf_low) {
+ if (xfs_inode_is_filestream(ap->ip))
+ args.type = XFS_ALLOCTYPE_FIRST_AG;
+ else
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.total = args.minlen = ap->minlen;
+ } else {
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.total = ap->total;
+ args.minlen = ap->minlen;
+ }
+ /* apply extent size hints if obtained earlier */
+ if (unlikely(align)) {
+ args.prod = align;
+ if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
+ args.mod = (xfs_extlen_t)(args.prod - args.mod);
+ } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
+ args.prod = 1;
+ args.mod = 0;
+ } else {
+ args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
+ if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
+ args.mod = (xfs_extlen_t)(args.prod - args.mod);
+ }
+ /*
+ * If we are not low on available data blocks, and the
+ * underlying logical volume manager is a stripe, and
+ * the file offset is zero then try to allocate data
+ * blocks on stripe unit boundary.
+ * NOTE: ap->aeof is only set if the allocation length
+ * is >= the stripe unit and the allocation offset is
+ * at the end of file.
+ */
+ if (!ap->flist->xbf_low && ap->aeof) {
+ if (!ap->offset) {
+ args.alignment = mp->m_dalign;
+ atype = args.type;
+ isaligned = 1;
+ /*
+ * Adjust for alignment
+ */
+ if (blen > args.alignment && blen <= args.maxlen)
+ args.minlen = blen - args.alignment;
+ args.minalignslop = 0;
+ } else {
+ /*
+ * First try an exact bno allocation.
+ * If it fails then do a near or start bno
+ * allocation with alignment turned on.
+ */
+ atype = args.type;
+ tryagain = 1;
+ args.type = XFS_ALLOCTYPE_THIS_BNO;
+ args.alignment = 1;
+ /*
+ * Compute the minlen+alignment for the
+ * next case. Set slop so that the value
+ * of minlen+alignment+slop doesn't go up
+ * between the calls.
+ */
+ if (blen > mp->m_dalign && blen <= args.maxlen)
+ nextminlen = blen - mp->m_dalign;
+ else
+ nextminlen = args.minlen;
+ if (nextminlen + mp->m_dalign > args.minlen + 1)
+ args.minalignslop =
+ nextminlen + mp->m_dalign -
+ args.minlen - 1;
+ else
+ args.minalignslop = 0;
+ }
+ } else {
+ args.alignment = 1;
+ args.minalignslop = 0;
+ }
+ args.minleft = ap->minleft;
+ args.wasdel = ap->wasdel;
+ args.isfl = 0;
+ args.userdata = ap->userdata;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ if (tryagain && args.fsbno == NULLFSBLOCK) {
+ /*
+ * Exact allocation failed. Now try with alignment
+ * turned on.
+ */
+ args.type = atype;
+ args.fsbno = ap->blkno;
+ args.alignment = mp->m_dalign;
+ args.minlen = nextminlen;
+ args.minalignslop = 0;
+ isaligned = 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+ if (isaligned && args.fsbno == NULLFSBLOCK) {
+ /*
+ * allocation failed, so turn off alignment and
+ * try again.
+ */
+ args.type = atype;
+ args.fsbno = ap->blkno;
+ args.alignment = 0;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+ if (args.fsbno == NULLFSBLOCK && nullfb &&
+ args.minlen > ap->minlen) {
+ args.minlen = ap->minlen;
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.fsbno = ap->blkno;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+ if (args.fsbno == NULLFSBLOCK && nullfb) {
+ args.fsbno = 0;
+ args.type = XFS_ALLOCTYPE_FIRST_AG;
+ args.total = ap->minlen;
+ args.minleft = 0;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ ap->flist->xbf_low = 1;
+ }
+ if (args.fsbno != NULLFSBLOCK) {
+ /*
+ * check the allocation happened at the same or higher AG than
+ * the first block that was allocated.
+ */
+ ASSERT(*ap->firstblock == NULLFSBLOCK ||
+ XFS_FSB_TO_AGNO(mp, *ap->firstblock) ==
+ XFS_FSB_TO_AGNO(mp, args.fsbno) ||
+ (ap->flist->xbf_low &&
+ XFS_FSB_TO_AGNO(mp, *ap->firstblock) <
+ XFS_FSB_TO_AGNO(mp, args.fsbno)));
+
+ ap->blkno = args.fsbno;
+ if (*ap->firstblock == NULLFSBLOCK)
+ *ap->firstblock = args.fsbno;
+ ASSERT(nullfb || fb_agno == args.agno ||
+ (ap->flist->xbf_low && fb_agno < args.agno));
+ ap->length = args.len;
+ ap->ip->i_d.di_nblocks += args.len;
+ xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
+ if (ap->wasdel)
+ ap->ip->i_delayed_blks -= args.len;
+ /*
+ * Adjust the disk quota also. This was reserved
+ * earlier.
+ */
+ xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
+ ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
+ XFS_TRANS_DQ_BCOUNT,
+ (long) args.len);
+ } else {
+ ap->blkno = NULLFSBLOCK;
+ ap->length = 0;
+ }
+ return 0;
+}
+
+/*
+ * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
+ * It figures out where to ask the underlying allocator to put the new extent.
+ */
+STATIC int
+xfs_bmap_alloc(
+ xfs_bmalloca_t *ap) /* bmap alloc argument struct */
+{
+ if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
+ return xfs_bmap_rtalloc(ap);
+ return xfs_bmap_btalloc(ap);
+}
+
+/*
+ * Transform a btree format file with only one leaf node, where the
+ * extents list will fit in the inode, into an extents format file.
+ * Since the file extents are already in-core, all we have to do is
+ * give up the space for the btree root and pitch the leaf block.
+ */
+STATIC int /* error */
+xfs_bmap_btree_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_btree_cur_t *cur, /* btree cursor */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ /* REFERENCED */
+ struct xfs_btree_block *cblock;/* child btree block */
+ xfs_fsblock_t cbno; /* child block number */
+ xfs_buf_t *cbp; /* child block's buffer */
+ int error; /* error return value */
+ xfs_ifork_t *ifp; /* inode fork data */
+ xfs_mount_t *mp; /* mount point structure */
+ __be64 *pp; /* ptr to block address */
+ struct xfs_btree_block *rblock;/* root btree block */
+
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
+ rblock = ifp->if_broot;
+ ASSERT(be16_to_cpu(rblock->bb_level) == 1);
+ ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
+ ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
+ cbno = be64_to_cpu(*pp);
+ *logflagsp = 0;
+#ifdef DEBUG
+ if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
+ return error;
+#endif
+ if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ cblock = XFS_BUF_TO_BLOCK(cbp);
+ if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
+ return error;
+ xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
+ ip->i_d.di_nblocks--;
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
+ xfs_trans_binval(tp, cbp);
+ if (cur->bc_bufs[0] == cbp)
+ cur->bc_bufs[0] = NULL;
+ xfs_iroot_realloc(ip, -1, whichfork);
+ ASSERT(ifp->if_broot == NULL);
+ ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
+ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+ *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
+ return 0;
+}
+
+/*
+ * Called by xfs_bmapi to update file extent records and the btree
+ * after removing space (or undoing a delayed allocation).
+ */
+STATIC int /* error */
+xfs_bmap_del_extent(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_trans_t *tp, /* current transaction pointer */
+ xfs_extnum_t *idx, /* extent number to update/delete */
+ xfs_bmap_free_t *flist, /* list of extents to be freed */
+ xfs_btree_cur_t *cur, /* if null, not a btree */
+ xfs_bmbt_irec_t *del, /* data to remove from extents */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
+ xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
+ xfs_fsblock_t del_endblock=0; /* first block past del */
+ xfs_fileoff_t del_endoff; /* first offset past del */
+ int delay; /* current block is delayed allocated */
+ int do_fx; /* free extent at end of routine */
+ xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */
+ int error; /* error return value */
+ int flags; /* inode logging flags */
+ xfs_bmbt_irec_t got; /* current extent entry */
+ xfs_fileoff_t got_endoff; /* first offset past got */
+ int i; /* temp state */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_filblks_t nblks; /* quota/sb block count */
+ xfs_bmbt_irec_t new; /* new record to be inserted */
+ /* REFERENCED */
+ uint qfield; /* quota field to update */
+ xfs_filblks_t temp; /* for indirect length calculations */
+ xfs_filblks_t temp2; /* for indirect length calculations */
+ int state = 0;
+
+ XFS_STATS_INC(xs_del_exlist);
+
+ if (whichfork == XFS_ATTR_FORK)
+ state |= BMAP_ATTRFORK;
+
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
+ (uint)sizeof(xfs_bmbt_rec_t)));
+ ASSERT(del->br_blockcount > 0);
+ ep = xfs_iext_get_ext(ifp, *idx);
+ xfs_bmbt_get_all(ep, &got);
+ ASSERT(got.br_startoff <= del->br_startoff);
+ del_endoff = del->br_startoff + del->br_blockcount;
+ got_endoff = got.br_startoff + got.br_blockcount;
+ ASSERT(got_endoff >= del_endoff);
+ delay = isnullstartblock(got.br_startblock);
+ ASSERT(isnullstartblock(del->br_startblock) == delay);
+ flags = 0;
+ qfield = 0;
+ error = 0;
+ /*
+ * If deleting a real allocation, must free up the disk space.
+ */
+ if (!delay) {
+ flags = XFS_ILOG_CORE;
+ /*
+ * Realtime allocation. Free it and record di_nblocks update.
+ */
+ if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
+ xfs_fsblock_t bno;
+ xfs_filblks_t len;
+
+ ASSERT(do_mod(del->br_blockcount,
+ mp->m_sb.sb_rextsize) == 0);
+ ASSERT(do_mod(del->br_startblock,
+ mp->m_sb.sb_rextsize) == 0);
+ bno = del->br_startblock;
+ len = del->br_blockcount;
+ do_div(bno, mp->m_sb.sb_rextsize);
+ do_div(len, mp->m_sb.sb_rextsize);
+ error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
+ if (error)
+ goto done;
+ do_fx = 0;
+ nblks = len * mp->m_sb.sb_rextsize;
+ qfield = XFS_TRANS_DQ_RTBCOUNT;
+ }
+ /*
+ * Ordinary allocation.
+ */
+ else {
+ do_fx = 1;
+ nblks = del->br_blockcount;
+ qfield = XFS_TRANS_DQ_BCOUNT;
+ }
+ /*
+ * Set up del_endblock and cur for later.
+ */
+ del_endblock = del->br_startblock + del->br_blockcount;
+ if (cur) {
+ if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
+ got.br_startblock, got.br_blockcount,
+ &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ }
+ da_old = da_new = 0;
+ } else {
+ da_old = startblockval(got.br_startblock);
+ da_new = 0;
+ nblks = 0;
+ do_fx = 0;
+ }
+ /*
+ * Set flag value to use in switch statement.
+ * Left-contig is 2, right-contig is 1.
+ */
+ switch (((got.br_startoff == del->br_startoff) << 1) |
+ (got_endoff == del_endoff)) {
+ case 3:
+ /*
+ * Matches the whole extent. Delete the entry.
+ */
+ xfs_iext_remove(ip, *idx, 1,
+ whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
+ --*idx;
+ if (delay)
+ break;
+
+ XFS_IFORK_NEXT_SET(ip, whichfork,
+ XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
+ flags |= XFS_ILOG_CORE;
+ if (!cur) {
+ flags |= xfs_ilog_fext(whichfork);
+ break;
+ }
+ if ((error = xfs_btree_delete(cur, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ break;
+
+ case 2:
+ /*
+ * Deleting the first part of the extent.
+ */
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_startoff(ep, del_endoff);
+ temp = got.br_blockcount - del->br_blockcount;
+ xfs_bmbt_set_blockcount(ep, temp);
+ if (delay) {
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ da_old);
+ xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ da_new = temp;
+ break;
+ }
+ xfs_bmbt_set_startblock(ep, del_endblock);
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ if (!cur) {
+ flags |= xfs_ilog_fext(whichfork);
+ break;
+ }
+ if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
+ got.br_blockcount - del->br_blockcount,
+ got.br_state)))
+ goto done;
+ break;
+
+ case 1:
+ /*
+ * Deleting the last part of the extent.
+ */
+ temp = got.br_blockcount - del->br_blockcount;
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep, temp);
+ if (delay) {
+ temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+ da_old);
+ xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ da_new = temp;
+ break;
+ }
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ if (!cur) {
+ flags |= xfs_ilog_fext(whichfork);
+ break;
+ }
+ if ((error = xfs_bmbt_update(cur, got.br_startoff,
+ got.br_startblock,
+ got.br_blockcount - del->br_blockcount,
+ got.br_state)))
+ goto done;
+ break;
+
+ case 0:
+ /*
+ * Deleting the middle of the extent.
+ */
+ temp = del->br_startoff - got.br_startoff;
+ trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
+ xfs_bmbt_set_blockcount(ep, temp);
+ new.br_startoff = del_endoff;
+ temp2 = got_endoff - del_endoff;
+ new.br_blockcount = temp2;
+ new.br_state = got.br_state;
+ if (!delay) {
+ new.br_startblock = del_endblock;
+ flags |= XFS_ILOG_CORE;
+ if (cur) {
+ if ((error = xfs_bmbt_update(cur,
+ got.br_startoff,
+ got.br_startblock, temp,
+ got.br_state)))
+ goto done;
+ if ((error = xfs_btree_increment(cur, 0, &i)))
+ goto done;
+ cur->bc_rec.b = new;
+ error = xfs_btree_insert(cur, &i);
+ if (error && error != ENOSPC)
+ goto done;
+ /*
+ * If get no-space back from btree insert,
+ * it tried a split, and we have a zero
+ * block reservation.
+ * Fix up our state and return the error.
+ */
+ if (error == ENOSPC) {
+ /*
+ * Reset the cursor, don't trust
+ * it after any insert operation.
+ */
+ if ((error = xfs_bmbt_lookup_eq(cur,
+ got.br_startoff,
+ got.br_startblock,
+ temp, &i)))
+ goto done;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ /*
+ * Update the btree record back
+ * to the original value.
+ */
+ if ((error = xfs_bmbt_update(cur,
+ got.br_startoff,
+ got.br_startblock,
+ got.br_blockcount,
+ got.br_state)))
+ goto done;
+ /*
+ * Reset the extent record back
+ * to the original value.
+ */
+ xfs_bmbt_set_blockcount(ep,
+ got.br_blockcount);
+ flags = 0;
+ error = XFS_ERROR(ENOSPC);
+ goto done;
+ }
+ XFS_WANT_CORRUPTED_GOTO(i == 1, done);
+ } else
+ flags |= xfs_ilog_fext(whichfork);
+ XFS_IFORK_NEXT_SET(ip, whichfork,
+ XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
+ } else {
+ ASSERT(whichfork == XFS_DATA_FORK);
+ temp = xfs_bmap_worst_indlen(ip, temp);
+ xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
+ temp2 = xfs_bmap_worst_indlen(ip, temp2);
+ new.br_startblock = nullstartblock((int)temp2);
+ da_new = temp + temp2;
+ while (da_new > da_old) {
+ if (temp) {
+ temp--;
+ da_new--;
+ xfs_bmbt_set_startblock(ep,
+ nullstartblock((int)temp));
+ }
+ if (da_new == da_old)
+ break;
+ if (temp2) {
+ temp2--;
+ da_new--;
+ new.br_startblock =
+ nullstartblock((int)temp2);
+ }
+ }
+ }
+ trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+ xfs_iext_insert(ip, *idx + 1, 1, &new, state);
+ ++*idx;
+ break;
+ }
+ /*
+ * If we need to, add to list of extents to delete.
+ */
+ if (do_fx)
+ xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
+ mp);
+ /*
+ * Adjust inode # blocks in the file.
+ */
+ if (nblks)
+ ip->i_d.di_nblocks -= nblks;
+ /*
+ * Adjust quota data.
+ */
+ if (qfield)
+ xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
+
+ /*
+ * Account for change in delayed indirect blocks.
+ * Nothing to do for disk quota accounting here.
+ */
+ ASSERT(da_old >= da_new);
+ if (da_old > da_new) {
+ xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
+ (int64_t)(da_old - da_new), 0);
+ }
+done:
+ *logflagsp = flags;
+ return error;
+}
+
+/*
+ * Remove the entry "free" from the free item list. Prev points to the
+ * previous entry, unless "free" is the head of the list.
+ */
+STATIC void
+xfs_bmap_del_free(
+ xfs_bmap_free_t *flist, /* free item list header */
+ xfs_bmap_free_item_t *prev, /* previous item on list, if any */
+ xfs_bmap_free_item_t *free) /* list item to be freed */
+{
+ if (prev)
+ prev->xbfi_next = free->xbfi_next;
+ else
+ flist->xbf_first = free->xbfi_next;
+ flist->xbf_count--;
+ kmem_zone_free(xfs_bmap_free_item_zone, free);
+}
+
+/*
+ * Convert an extents-format file into a btree-format file.
+ * The new file will have a root block (in the inode) and a single child block.
+ */
+STATIC int /* error */
+xfs_bmap_extents_to_btree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first-block-allocated */
+ xfs_bmap_free_t *flist, /* blocks freed in xaction */
+ xfs_btree_cur_t **curp, /* cursor returned to caller */
+ int wasdel, /* converting a delayed alloc */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_btree_block *ablock; /* allocated (child) bt block */
+ xfs_buf_t *abp; /* buffer for ablock */
+ xfs_alloc_arg_t args; /* allocation arguments */
+ xfs_bmbt_rec_t *arp; /* child record pointer */
+ struct xfs_btree_block *block; /* btree root block */
+ xfs_btree_cur_t *cur; /* bmap btree cursor */
+ xfs_bmbt_rec_host_t *ep; /* extent record pointer */
+ int error; /* error return value */
+ xfs_extnum_t i, cnt; /* extent record index */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_key_t *kp; /* root block key pointer */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_extnum_t nextents; /* number of file extents */
+ xfs_bmbt_ptr_t *pp; /* root block address pointer */
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
+
+ /*
+ * Make space in the inode incore.
+ */
+ xfs_iroot_realloc(ip, 1, whichfork);
+ ifp->if_flags |= XFS_IFBROOT;
+
+ /*
+ * Fill in the root.
+ */
+ block = ifp->if_broot;
+ block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
+ block->bb_level = cpu_to_be16(1);
+ block->bb_numrecs = cpu_to_be16(1);
+ block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
+ block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
+
+ /*
+ * Need a cursor. Can't allocate until bb_level is filled in.
+ */
+ mp = ip->i_mount;
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_private.b.firstblock = *firstblock;
+ cur->bc_private.b.flist = flist;
+ cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
+ /*
+ * Convert to a btree with two levels, one record in root.
+ */
+ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
+ args.tp = tp;
+ args.mp = mp;
+ args.firstblock = *firstblock;
+ if (*firstblock == NULLFSBLOCK) {
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
+ } else if (flist->xbf_low) {
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ args.fsbno = *firstblock;
+ } else {
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.fsbno = *firstblock;
+ }
+ args.minlen = args.maxlen = args.prod = 1;
+ args.total = args.minleft = args.alignment = args.mod = args.isfl =
+ args.minalignslop = 0;
+ args.wasdel = wasdel;
+ *logflagsp = 0;
+ if ((error = xfs_alloc_vextent(&args))) {
+ xfs_iroot_realloc(ip, -1, whichfork);
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+ }
+ /*
+ * Allocation can't fail, the space was reserved.
+ */
+ ASSERT(args.fsbno != NULLFSBLOCK);
+ ASSERT(*firstblock == NULLFSBLOCK ||
+ args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
+ (flist->xbf_low &&
+ args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
+ *firstblock = cur->bc_private.b.firstblock = args.fsbno;
+ cur->bc_private.b.allocated++;
+ ip->i_d.di_nblocks++;
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
+ abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
+ /*
+ * Fill in the child block.
+ */
+ ablock = XFS_BUF_TO_BLOCK(abp);
+ ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
+ ablock->bb_level = 0;
+ ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
+ ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
+ arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ for (cnt = i = 0; i < nextents; i++) {
+ ep = xfs_iext_get_ext(ifp, i);
+ if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
+ arp->l0 = cpu_to_be64(ep->l0);
+ arp->l1 = cpu_to_be64(ep->l1);
+ arp++; cnt++;
+ }
+ }
+ ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
+ xfs_btree_set_numrecs(ablock, cnt);
+
+ /*
+ * Fill in the root key and pointer.
+ */
+ kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
+ arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
+ kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
+ pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
+ be16_to_cpu(block->bb_level)));
+ *pp = cpu_to_be64(args.fsbno);
+
+ /*
+ * Do all this logging at the end so that
+ * the root is at the right level.
+ */
+ xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
+ xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
+ ASSERT(*curp == NULL);
+ *curp = cur;
+ *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
+ return 0;
+}
+
+/*
+ * Calculate the default attribute fork offset for newly created inodes.
+ */
+uint
+xfs_default_attroffset(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ uint offset;
+
+ if (mp->m_sb.sb_inodesize == 256) {
+ offset = XFS_LITINO(mp) -
+ XFS_BMDR_SPACE_CALC(MINABTPTRS);
+ } else {
+ offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
+ }
+
+ ASSERT(offset < XFS_LITINO(mp));
+ return offset;
+}
+
+/*
+ * Helper routine to reset inode di_forkoff field when switching
+ * attribute fork from local to extent format - we reset it where
+ * possible to make space available for inline data fork extents.
+ */
+STATIC void
+xfs_bmap_forkoff_reset(
+ xfs_mount_t *mp,
+ xfs_inode_t *ip,
+ int whichfork)
+{
+ if (whichfork == XFS_ATTR_FORK &&
+ ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
+ ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
+ ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
+ uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
+
+ if (dfl_forkoff > ip->i_d.di_forkoff)
+ ip->i_d.di_forkoff = dfl_forkoff;
+ }
+}
+
+/*
+ * Convert a local file to an extents file.
+ * This code is out of bounds for data forks of regular files,
+ * since the file data needs to get logged so things will stay consistent.
+ * (The bmap-level manipulations are ok, though).
+ */
+STATIC int /* error */
+xfs_bmap_local_to_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fsblock_t *firstblock, /* first block allocated in xaction */
+ xfs_extlen_t total, /* total blocks needed by transaction */
+ int *logflagsp, /* inode logging flags */
+ int whichfork) /* data or attr fork */
+{
+ int error; /* error return value */
+ int flags; /* logging flags returned */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+
+ /*
+ * We don't want to deal with the case of keeping inode data inline yet.
+ * So sending the data fork of a regular inode is invalid.
+ */
+ ASSERT(!(S_ISREG(ip->i_d.di_mode) && whichfork == XFS_DATA_FORK));
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+ flags = 0;
+ error = 0;
+ if (ifp->if_bytes) {
+ xfs_alloc_arg_t args; /* allocation arguments */
+ xfs_buf_t *bp; /* buffer for extent block */
+ xfs_bmbt_rec_host_t *ep;/* extent record pointer */
+
+ args.tp = tp;
+ args.mp = ip->i_mount;
+ args.firstblock = *firstblock;
+ ASSERT((ifp->if_flags &
+ (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE);
+ /*
+ * Allocate a block. We know we need only one, since the
+ * file currently fits in an inode.
+ */
+ if (*firstblock == NULLFSBLOCK) {
+ args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
+ args.type = XFS_ALLOCTYPE_START_BNO;
+ } else {
+ args.fsbno = *firstblock;
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ }
+ args.total = total;
+ args.mod = args.minleft = args.alignment = args.wasdel =
+ args.isfl = args.minalignslop = 0;
+ args.minlen = args.maxlen = args.prod = 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ goto done;
+ /*
+ * Can't fail, the space was reserved.
+ */
+ ASSERT(args.fsbno != NULLFSBLOCK);
+ ASSERT(args.len == 1);
+ *firstblock = args.fsbno;
+ bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
+ memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
+ xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
+ xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
+ xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
+ xfs_iext_add(ifp, 0, 1);
+ ep = xfs_iext_get_ext(ifp, 0);
+ xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
+ trace_xfs_bmap_post_update(ip, 0,
+ whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
+ _THIS_IP_);
+ XFS_IFORK_NEXT_SET(ip, whichfork, 1);
+ ip->i_d.di_nblocks = 1;
+ xfs_trans_mod_dquot_byino(tp, ip,
+ XFS_TRANS_DQ_BCOUNT, 1L);
+ flags |= xfs_ilog_fext(whichfork);
+ } else {
+ ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
+ xfs_bmap_forkoff_reset(ip->i_mount, ip, whichfork);
+ }
+ ifp->if_flags &= ~XFS_IFINLINE;
+ ifp->if_flags |= XFS_IFEXTENTS;
+ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+ flags |= XFS_ILOG_CORE;
+done:
+ *logflagsp = flags;
+ return error;
+}
+
+/*
+ * Search the extent records for the entry containing block bno.
+ * If bno lies in a hole, point to the next entry. If bno lies
+ * past eof, *eofp will be set, and *prevp will contain the last
+ * entry (null if none). Else, *lastxp will be set to the index
+ * of the found entry; *gotp will contain the entry.
+ */
+STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
+xfs_bmap_search_multi_extents(
+ xfs_ifork_t *ifp, /* inode fork pointer */
+ xfs_fileoff_t bno, /* block number searched for */
+ int *eofp, /* out: end of file found */
+ xfs_extnum_t *lastxp, /* out: last extent index */
+ xfs_bmbt_irec_t *gotp, /* out: extent entry found */
+ xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
+{
+ xfs_bmbt_rec_host_t *ep; /* extent record pointer */
+ xfs_extnum_t lastx; /* last extent index */
+
+ /*
+ * Initialize the extent entry structure to catch access to
+ * uninitialized br_startblock field.
+ */
+ gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL;
+ gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL;
+ gotp->br_state = XFS_EXT_INVALID;
+#if XFS_BIG_BLKNOS
+ gotp->br_startblock = 0xffffa5a5a5a5a5a5LL;
+#else
+ gotp->br_startblock = 0xffffa5a5;
+#endif
+ prevp->br_startoff = NULLFILEOFF;
+
+ ep = xfs_iext_bno_to_ext(ifp, bno, &lastx);
+ if (lastx > 0) {
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp);
+ }
+ if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
+ xfs_bmbt_get_all(ep, gotp);
+ *eofp = 0;
+ } else {
+ if (lastx > 0) {
+ *gotp = *prevp;
+ }
+ *eofp = 1;
+ ep = NULL;
+ }
+ *lastxp = lastx;
+ return ep;
+}
+
+/*
+ * Search the extents list for the inode, for the extent containing bno.
+ * If bno lies in a hole, point to the next entry. If bno lies past eof,
+ * *eofp will be set, and *prevp will contain the last entry (null if none).
+ * Else, *lastxp will be set to the index of the found
+ * entry; *gotp will contain the entry.
+ */
+STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
+xfs_bmap_search_extents(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_fileoff_t bno, /* block number searched for */
+ int fork, /* data or attr fork */
+ int *eofp, /* out: end of file found */
+ xfs_extnum_t *lastxp, /* out: last extent index */
+ xfs_bmbt_irec_t *gotp, /* out: extent entry found */
+ xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
+{
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_bmbt_rec_host_t *ep; /* extent record pointer */
+
+ XFS_STATS_INC(xs_look_exlist);
+ ifp = XFS_IFORK_PTR(ip, fork);
+
+ ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
+
+ if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) &&
+ !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) {
+ xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
+ "Access to block zero in inode %llu "
+ "start_block: %llx start_off: %llx "
+ "blkcnt: %llx extent-state: %x lastx: %x\n",
+ (unsigned long long)ip->i_ino,
+ (unsigned long long)gotp->br_startblock,
+ (unsigned long long)gotp->br_startoff,
+ (unsigned long long)gotp->br_blockcount,
+ gotp->br_state, *lastxp);
+ *lastxp = NULLEXTNUM;
+ *eofp = 1;
+ return NULL;
+ }
+ return ep;
+}
+
+/*
+ * Compute the worst-case number of indirect blocks that will be used
+ * for ip's delayed extent of length "len".
+ */
+STATIC xfs_filblks_t
+xfs_bmap_worst_indlen(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_filblks_t len) /* delayed extent length */
+{
+ int level; /* btree level number */
+ int maxrecs; /* maximum record count at this level */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_filblks_t rval; /* return value */
+
+ mp = ip->i_mount;
+ maxrecs = mp->m_bmap_dmxr[0];
+ for (level = 0, rval = 0;
+ level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
+ level++) {
+ len += maxrecs - 1;
+ do_div(len, maxrecs);
+ rval += len;
+ if (len == 1)
+ return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
+ level - 1;
+ if (level == 0)
+ maxrecs = mp->m_bmap_dmxr[1];
+ }
+ return rval;
+}
+
+/*
+ * Convert inode from non-attributed to attributed.
+ * Must not be in a transaction, ip must not be locked.
+ */
+int /* error code */
+xfs_bmap_add_attrfork(
+ xfs_inode_t *ip, /* incore inode pointer */
+ int size, /* space new attribute needs */
+ int rsvd) /* xact may use reserved blks */
+{
+ xfs_fsblock_t firstblock; /* 1st block/ag allocated */
+ xfs_bmap_free_t flist; /* freed extent records */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_trans_t *tp; /* transaction pointer */
+ int blks; /* space reservation */
+ int version = 1; /* superblock attr version */
+ int committed; /* xaction was committed */
+ int logflags; /* logging flags */
+ int error; /* error return value */
+
+ ASSERT(XFS_IFORK_Q(ip) == 0);
+
+ mp = ip->i_mount;
+ ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
+ tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
+ blks = XFS_ADDAFORK_SPACE_RES(mp);
+ if (rsvd)
+ tp->t_flags |= XFS_TRANS_RESERVE;
+ if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
+ goto error0;
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
+ XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
+ XFS_QMOPT_RES_REGBLKS);
+ if (error) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
+ return error;
+ }
+ if (XFS_IFORK_Q(ip))
+ goto error1;
+ if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
+ /*
+ * For inodes coming from pre-6.2 filesystems.
+ */
+ ASSERT(ip->i_d.di_aformat == 0);
+ ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+ }
+ ASSERT(ip->i_d.di_anextents == 0);
+
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ switch (ip->i_d.di_format) {
+ case XFS_DINODE_FMT_DEV:
+ ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
+ break;
+ case XFS_DINODE_FMT_UUID:
+ ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
+ break;
+ case XFS_DINODE_FMT_LOCAL:
+ case XFS_DINODE_FMT_EXTENTS:
+ case XFS_DINODE_FMT_BTREE:
+ ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
+ if (!ip->i_d.di_forkoff)
+ ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
+ else if (mp->m_flags & XFS_MOUNT_ATTR2)
+ version = 2;
+ break;
+ default:
+ ASSERT(0);
+ error = XFS_ERROR(EINVAL);
+ goto error1;
+ }
+
+ ASSERT(ip->i_afp == NULL);
+ ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
+ ip->i_afp->if_flags = XFS_IFEXTENTS;
+ logflags = 0;
+ xfs_bmap_init(&flist, &firstblock);
+ switch (ip->i_d.di_format) {
+ case XFS_DINODE_FMT_LOCAL:
+ error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
+ &logflags);
+ break;
+ case XFS_DINODE_FMT_EXTENTS:
+ error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
+ &flist, &logflags);
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
+ &logflags);
+ break;
+ default:
+ error = 0;
+ break;
+ }
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ if (error)
+ goto error2;
+ if (!xfs_sb_version_hasattr(&mp->m_sb) ||
+ (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
+ __int64_t sbfields = 0;
+
+ spin_lock(&mp->m_sb_lock);
+ if (!xfs_sb_version_hasattr(&mp->m_sb)) {
+ xfs_sb_version_addattr(&mp->m_sb);
+ sbfields |= XFS_SB_VERSIONNUM;
+ }
+ if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
+ xfs_sb_version_addattr2(&mp->m_sb);
+ sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
+ }
+ if (sbfields) {
+ spin_unlock(&mp->m_sb_lock);
+ xfs_mod_sb(tp, sbfields);
+ } else
+ spin_unlock(&mp->m_sb_lock);
+ }
+
+ error = xfs_bmap_finish(&tp, &flist, &committed);
+ if (error)
+ goto error2;
+ return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+error2:
+ xfs_bmap_cancel(&flist);
+error1:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+error0:
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+ return error;
+}
+
+/*
+ * Add the extent to the list of extents to be free at transaction end.
+ * The list is maintained sorted (by block number).
+ */
+/* ARGSUSED */
+void
+xfs_bmap_add_free(
+ xfs_fsblock_t bno, /* fs block number of extent */
+ xfs_filblks_t len, /* length of extent */
+ xfs_bmap_free_t *flist, /* list of extents */
+ xfs_mount_t *mp) /* mount point structure */
+{
+ xfs_bmap_free_item_t *cur; /* current (next) element */
+ xfs_bmap_free_item_t *new; /* new element */
+ xfs_bmap_free_item_t *prev; /* previous element */
+#ifdef DEBUG
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+
+ ASSERT(bno != NULLFSBLOCK);
+ ASSERT(len > 0);
+ ASSERT(len <= MAXEXTLEN);
+ ASSERT(!isnullstartblock(bno));
+ agno = XFS_FSB_TO_AGNO(mp, bno);
+ agbno = XFS_FSB_TO_AGBNO(mp, bno);
+ ASSERT(agno < mp->m_sb.sb_agcount);
+ ASSERT(agbno < mp->m_sb.sb_agblocks);
+ ASSERT(len < mp->m_sb.sb_agblocks);
+ ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
+#endif
+ ASSERT(xfs_bmap_free_item_zone != NULL);
+ new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
+ new->xbfi_startblock = bno;
+ new->xbfi_blockcount = (xfs_extlen_t)len;
+ for (prev = NULL, cur = flist->xbf_first;
+ cur != NULL;
+ prev = cur, cur = cur->xbfi_next) {
+ if (cur->xbfi_startblock >= bno)
+ break;
+ }
+ if (prev)
+ prev->xbfi_next = new;
+ else
+ flist->xbf_first = new;
+ new->xbfi_next = cur;
+ flist->xbf_count++;
+}
+
+/*
+ * Compute and fill in the value of the maximum depth of a bmap btree
+ * in this filesystem. Done once, during mount.
+ */
+void
+xfs_bmap_compute_maxlevels(
+ xfs_mount_t *mp, /* file system mount structure */
+ int whichfork) /* data or attr fork */
+{
+ int level; /* btree level */
+ uint maxblocks; /* max blocks at this level */
+ uint maxleafents; /* max leaf entries possible */
+ int maxrootrecs; /* max records in root block */
+ int minleafrecs; /* min records in leaf block */
+ int minnoderecs; /* min records in node block */
+ int sz; /* root block size */
+
+ /*
+ * The maximum number of extents in a file, hence the maximum
+ * number of leaf entries, is controlled by the type of di_nextents
+ * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
+ * (a signed 16-bit number, xfs_aextnum_t).
+ *
+ * Note that we can no longer assume that if we are in ATTR1 that
+ * the fork offset of all the inodes will be
+ * (xfs_default_attroffset(ip) >> 3) because we could have mounted
+ * with ATTR2 and then mounted back with ATTR1, keeping the
+ * di_forkoff's fixed but probably at various positions. Therefore,
+ * for both ATTR1 and ATTR2 we have to assume the worst case scenario
+ * of a minimum size available.
+ */
+ if (whichfork == XFS_DATA_FORK) {
+ maxleafents = MAXEXTNUM;
+ sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
+ } else {
+ maxleafents = MAXAEXTNUM;
+ sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
+ }
+ maxrootrecs = xfs_bmdr_maxrecs(mp, sz, 0);
+ minleafrecs = mp->m_bmap_dmnr[0];
+ minnoderecs = mp->m_bmap_dmnr[1];
+ maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
+ for (level = 1; maxblocks > 1; level++) {
+ if (maxblocks <= maxrootrecs)
+ maxblocks = 1;
+ else
+ maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
+ }
+ mp->m_bm_maxlevels[whichfork] = level;
+}
+
+/*
+ * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
+ * caller. Frees all the extents that need freeing, which must be done
+ * last due to locking considerations. We never free any extents in
+ * the first transaction.
+ *
+ * Return 1 if the given transaction was committed and a new one
+ * started, and 0 otherwise in the committed parameter.
+ */
+int /* error */
+xfs_bmap_finish(
+ xfs_trans_t **tp, /* transaction pointer addr */
+ xfs_bmap_free_t *flist, /* i/o: list extents to free */
+ int *committed) /* xact committed or not */
+{
+ xfs_efd_log_item_t *efd; /* extent free data */
+ xfs_efi_log_item_t *efi; /* extent free intention */
+ int error; /* error return value */
+ xfs_bmap_free_item_t *free; /* free extent item */
+ unsigned int logres; /* new log reservation */
+ unsigned int logcount; /* new log count */
+ xfs_mount_t *mp; /* filesystem mount structure */
+ xfs_bmap_free_item_t *next; /* next item on free list */
+ xfs_trans_t *ntp; /* new transaction pointer */
+
+ ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
+ if (flist->xbf_count == 0) {
+ *committed = 0;
+ return 0;
+ }
+ ntp = *tp;
+ efi = xfs_trans_get_efi(ntp, flist->xbf_count);
+ for (free = flist->xbf_first; free; free = free->xbfi_next)
+ xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
+ free->xbfi_blockcount);
+ logres = ntp->t_log_res;
+ logcount = ntp->t_log_count;
+ ntp = xfs_trans_dup(*tp);
+ error = xfs_trans_commit(*tp, 0);
+ *tp = ntp;
+ *committed = 1;
+ /*
+ * We have a new transaction, so we should return committed=1,
+ * even though we're returning an error.
+ */
+ if (error)
+ return error;
+
+ /*
+ * transaction commit worked ok so we can drop the extra ticket
+ * reference that we gained in xfs_trans_dup()
+ */
+ xfs_log_ticket_put(ntp->t_ticket);
+
+ if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
+ logcount)))
+ return error;
+ efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
+ for (free = flist->xbf_first; free != NULL; free = next) {
+ next = free->xbfi_next;
+ if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
+ free->xbfi_blockcount))) {
+ /*
+ * The bmap free list will be cleaned up at a
+ * higher level. The EFI will be canceled when
+ * this transaction is aborted.
+ * Need to force shutdown here to make sure it
+ * happens, since this transaction may not be
+ * dirty yet.
+ */
+ mp = ntp->t_mountp;
+ if (!XFS_FORCED_SHUTDOWN(mp))
+ xfs_force_shutdown(mp,
+ (error == EFSCORRUPTED) ?
+ SHUTDOWN_CORRUPT_INCORE :
+ SHUTDOWN_META_IO_ERROR);
+ return error;
+ }
+ xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
+ free->xbfi_blockcount);
+ xfs_bmap_del_free(flist, NULL, free);
+ }
+ return 0;
+}
+
+/*
+ * Free up any items left in the list.
+ */
+void
+xfs_bmap_cancel(
+ xfs_bmap_free_t *flist) /* list of bmap_free_items */
+{
+ xfs_bmap_free_item_t *free; /* free list item */
+ xfs_bmap_free_item_t *next;
+
+ if (flist->xbf_count == 0)
+ return;
+ ASSERT(flist->xbf_first != NULL);
+ for (free = flist->xbf_first; free; free = next) {
+ next = free->xbfi_next;
+ xfs_bmap_del_free(flist, NULL, free);
+ }
+ ASSERT(flist->xbf_count == 0);
+}
+
+/*
+ * Returns the file-relative block number of the first unused block(s)
+ * in the file with at least "len" logically contiguous blocks free.
+ * This is the lowest-address hole if the file has holes, else the first block
+ * past the end of file.
+ * Return 0 if the file is currently local (in-inode).
+ */
+int /* error */
+xfs_bmap_first_unused(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ xfs_extlen_t len, /* size of hole to find */
+ xfs_fileoff_t *first_unused, /* unused block */
+ int whichfork) /* data or attr fork */
+{
+ int error; /* error return value */
+ int idx; /* extent record index */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_fileoff_t lastaddr; /* last block number seen */
+ xfs_fileoff_t lowest; /* lowest useful block */
+ xfs_fileoff_t max; /* starting useful block */
+ xfs_fileoff_t off; /* offset for this block */
+ xfs_extnum_t nextents; /* number of extent entries */
+
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
+ XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
+ XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+ *first_unused = 0;
+ return 0;
+ }
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ lowest = *first_unused;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
+ xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
+ off = xfs_bmbt_get_startoff(ep);
+ /*
+ * See if the hole before this extent will work.
+ */
+ if (off >= lowest + len && off - max >= len) {
+ *first_unused = max;
+ return 0;
+ }
+ lastaddr = off + xfs_bmbt_get_blockcount(ep);
+ max = XFS_FILEOFF_MAX(lastaddr, lowest);
+ }
+ *first_unused = max;
+ return 0;
+}
+
+/*
+ * Returns the file-relative block number of the last block + 1 before
+ * last_block (input value) in the file.
+ * This is not based on i_size, it is based on the extent records.
+ * Returns 0 for local files, as they do not have extent records.
+ */
+int /* error */
+xfs_bmap_last_before(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ xfs_fileoff_t *last_block, /* last block */
+ int whichfork) /* data or attr fork */
+{
+ xfs_fileoff_t bno; /* input file offset */
+ int eof; /* hit end of file */
+ xfs_bmbt_rec_host_t *ep; /* pointer to last extent */
+ int error; /* error return value */
+ xfs_bmbt_irec_t got; /* current extent value */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t lastx; /* last extent used */
+ xfs_bmbt_irec_t prev; /* previous extent value */
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
+ return XFS_ERROR(EIO);
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+ *last_block = 0;
+ return 0;
+ }
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ bno = *last_block - 1;
+ ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+ &prev);
+ if (eof || xfs_bmbt_get_startoff(ep) > bno) {
+ if (prev.br_startoff == NULLFILEOFF)
+ *last_block = 0;
+ else
+ *last_block = prev.br_startoff + prev.br_blockcount;
+ }
+ /*
+ * Otherwise *last_block is already the right answer.
+ */
+ return 0;
+}
+
+STATIC int
+xfs_bmap_last_extent(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_bmbt_irec *rec,
+ int *is_empty)
+{
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
+ int error;
+ int nextents;
+
+ if (!(ifp->if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ return error;
+ }
+
+ nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
+ if (nextents == 0) {
+ *is_empty = 1;
+ return 0;
+ }
+
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec);
+ *is_empty = 0;
+ return 0;
+}
+
+/*
+ * Check the last inode extent to determine whether this allocation will result
+ * in blocks being allocated at the end of the file. When we allocate new data
+ * blocks at the end of the file which do not start at the previous data block,
+ * we will try to align the new blocks at stripe unit boundaries.
+ *
+ * Returns 0 in bma->aeof if the file (fork) is empty as any new write will be
+ * at, or past the EOF.
+ */
+STATIC int
+xfs_bmap_isaeof(
+ struct xfs_bmalloca *bma,
+ int whichfork)
+{
+ struct xfs_bmbt_irec rec;
+ int is_empty;
+ int error;
+
+ bma->aeof = 0;
+ error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
+ &is_empty);
+ if (error || is_empty)
+ return error;
+
+ /*
+ * Check if we are allocation or past the last extent, or at least into
+ * the last delayed allocated extent.
+ */
+ bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
+ (bma->offset >= rec.br_startoff &&
+ isnullstartblock(rec.br_startblock));
+ return 0;
+}
+
+/*
+ * Check if the endoff is outside the last extent. If so the caller will grow
+ * the allocation to a stripe unit boundary. All offsets are considered outside
+ * the end of file for an empty fork, so 1 is returned in *eof in that case.
+ */
+int
+xfs_bmap_eof(
+ struct xfs_inode *ip,
+ xfs_fileoff_t endoff,
+ int whichfork,
+ int *eof)
+{
+ struct xfs_bmbt_irec rec;
+ int error;
+
+ error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof);
+ if (error || *eof)
+ return error;
+
+ *eof = endoff >= rec.br_startoff + rec.br_blockcount;
+ return 0;
+}
+
+/*
+ * Returns the file-relative block number of the first block past eof in
+ * the file. This is not based on i_size, it is based on the extent records.
+ * Returns 0 for local files, as they do not have extent records.
+ */
+int
+xfs_bmap_last_offset(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ xfs_fileoff_t *last_block,
+ int whichfork)
+{
+ struct xfs_bmbt_irec rec;
+ int is_empty;
+ int error;
+
+ *last_block = 0;
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL)
+ return 0;
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+ return XFS_ERROR(EIO);
+
+ error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
+ if (error || is_empty)
+ return error;
+
+ *last_block = rec.br_startoff + rec.br_blockcount;
+ return 0;
+}
+
+/*
+ * Returns whether the selected fork of the inode has exactly one
+ * block or not. For the data fork we check this matches di_size,
+ * implying the file's range is 0..bsize-1.
+ */
+int /* 1=>1 block, 0=>otherwise */
+xfs_bmap_one_block(
+ xfs_inode_t *ip, /* incore inode */
+ int whichfork) /* data or attr fork */
+{
+ xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ int rval; /* return value */
+ xfs_bmbt_irec_t s; /* internal version of extent */
+
+#ifndef DEBUG
+ if (whichfork == XFS_DATA_FORK)
+ return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
+#endif /* !DEBUG */
+ if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
+ return 0;
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+ return 0;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+ ep = xfs_iext_get_ext(ifp, 0);
+ xfs_bmbt_get_all(ep, &s);
+ rval = s.br_startoff == 0 && s.br_blockcount == 1;
+ if (rval && whichfork == XFS_DATA_FORK)
+ ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
+ return rval;
+}
+
+STATIC int
+xfs_bmap_sanity_check(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp,
+ int level)
+{
+ struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
+
+ if (block->bb_magic != cpu_to_be32(XFS_BMAP_MAGIC) ||
+ be16_to_cpu(block->bb_level) != level ||
+ be16_to_cpu(block->bb_numrecs) == 0 ||
+ be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
+ return 0;
+ return 1;
+}
+
+/*
+ * Read in the extents to if_extents.
+ * All inode fields are set up by caller, we just traverse the btree
+ * and copy the records in. If the file system cannot contain unwritten
+ * extents, the records are checked for no "state" flags.
+ */
+int /* error */
+xfs_bmap_read_extents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_btree_block *block; /* current btree block */
+ xfs_fsblock_t bno; /* block # of "block" */
+ xfs_buf_t *bp; /* buffer for "block" */
+ int error; /* error return value */
+ xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
+ xfs_extnum_t i, j; /* index into the extents list */
+ xfs_ifork_t *ifp; /* fork structure */
+ int level; /* btree level, for checking */
+ xfs_mount_t *mp; /* file system mount structure */
+ __be64 *pp; /* pointer to block address */
+ /* REFERENCED */
+ xfs_extnum_t room; /* number of entries there's room for */
+
+ bno = NULLFSBLOCK;
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
+ XFS_EXTFMT_INODE(ip);
+ block = ifp->if_broot;
+ /*
+ * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+ */
+ level = be16_to_cpu(block->bb_level);
+ ASSERT(level > 0);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
+ bno = be64_to_cpu(*pp);
+ ASSERT(bno != NULLDFSBNO);
+ ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
+ ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
+ /*
+ * Go down the tree until leaf level is reached, following the first
+ * pointer (leftmost) at each level.
+ */
+ while (level-- > 0) {
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ block = XFS_BUF_TO_BLOCK(bp);
+ XFS_WANT_CORRUPTED_GOTO(
+ xfs_bmap_sanity_check(mp, bp, level),
+ error0);
+ if (level == 0)
+ break;
+ pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
+ bno = be64_to_cpu(*pp);
+ XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
+ xfs_trans_brelse(tp, bp);
+ }
+ /*
+ * Here with bp and block set to the leftmost leaf node in the tree.
+ */
+ room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ i = 0;
+ /*
+ * Loop over all leaf nodes. Copy information to the extent records.
+ */
+ for (;;) {
+ xfs_bmbt_rec_t *frp;
+ xfs_fsblock_t nextbno;
+ xfs_extnum_t num_recs;
+ xfs_extnum_t start;
+
+ num_recs = xfs_btree_get_numrecs(block);
+ if (unlikely(i + num_recs > room)) {
+ ASSERT(i + num_recs <= room);
+ xfs_warn(ip->i_mount,
+ "corrupt dinode %Lu, (btree extents).",
+ (unsigned long long) ip->i_ino);
+ XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
+ XFS_ERRLEVEL_LOW, ip->i_mount, block);
+ goto error0;
+ }
+ XFS_WANT_CORRUPTED_GOTO(
+ xfs_bmap_sanity_check(mp, bp, 0),
+ error0);
+ /*
+ * Read-ahead the next leaf block, if any.
+ */
+ nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
+ if (nextbno != NULLFSBLOCK)
+ xfs_btree_reada_bufl(mp, nextbno, 1);
+ /*
+ * Copy records into the extent records.
+ */
+ frp = XFS_BMBT_REC_ADDR(mp, block, 1);
+ start = i;
+ for (j = 0; j < num_recs; j++, i++, frp++) {
+ xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
+ trp->l0 = be64_to_cpu(frp->l0);
+ trp->l1 = be64_to_cpu(frp->l1);
+ }
+ if (exntf == XFS_EXTFMT_NOSTATE) {
+ /*
+ * Check all attribute bmap btree records and
+ * any "older" data bmap btree records for a
+ * set bit in the "extent flag" position.
+ */
+ if (unlikely(xfs_check_nostate_extents(ifp,
+ start, num_recs))) {
+ XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
+ XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ goto error0;
+ }
+ }
+ xfs_trans_brelse(tp, bp);
+ bno = nextbno;
+ /*
+ * If we've reached the end, stop.
+ */
+ if (bno == NULLFSBLOCK)
+ break;
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ block = XFS_BUF_TO_BLOCK(bp);
+ }
+ ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
+ ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
+ XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
+ return 0;
+error0:
+ xfs_trans_brelse(tp, bp);
+ return XFS_ERROR(EFSCORRUPTED);
+}
+
+#ifdef DEBUG
+/*
+ * Add bmap trace insert entries for all the contents of the extent records.
+ */
+void
+xfs_bmap_trace_exlist(
+ xfs_inode_t *ip, /* incore inode pointer */
+ xfs_extnum_t cnt, /* count of entries in the list */
+ int whichfork, /* data or attr fork */
+ unsigned long caller_ip)
+{
+ xfs_extnum_t idx; /* extent record index */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ int state = 0;
+
+ if (whichfork == XFS_ATTR_FORK)
+ state |= BMAP_ATTRFORK;
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)));
+ for (idx = 0; idx < cnt; idx++)
+ trace_xfs_extlist(ip, idx, whichfork, caller_ip);
+}
+
+/*
+ * Validate that the bmbt_irecs being returned from bmapi are valid
+ * given the callers original parameters. Specifically check the
+ * ranges of the returned irecs to ensure that they only extent beyond
+ * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
+ */
+STATIC void
+xfs_bmap_validate_ret(
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ int flags,
+ xfs_bmbt_irec_t *mval,
+ int nmap,
+ int ret_nmap)
+{
+ int i; /* index to map values */
+
+ ASSERT(ret_nmap <= nmap);
+
+ for (i = 0; i < ret_nmap; i++) {
+ ASSERT(mval[i].br_blockcount > 0);
+ if (!(flags & XFS_BMAPI_ENTIRE)) {
+ ASSERT(mval[i].br_startoff >= bno);
+ ASSERT(mval[i].br_blockcount <= len);
+ ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
+ bno + len);
+ } else {
+ ASSERT(mval[i].br_startoff < bno + len);
+ ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
+ bno);
+ }
+ ASSERT(i == 0 ||
+ mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
+ mval[i].br_startoff);
+ ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
+ mval[i].br_startblock != HOLESTARTBLOCK);
+ ASSERT(mval[i].br_state == XFS_EXT_NORM ||
+ mval[i].br_state == XFS_EXT_UNWRITTEN);
+ }
+}
+#endif /* DEBUG */
+
+
+/*
+ * Trim the returned map to the required bounds
+ */
+STATIC void
+xfs_bmapi_trim_map(
+ struct xfs_bmbt_irec *mval,
+ struct xfs_bmbt_irec *got,
+ xfs_fileoff_t *bno,
+ xfs_filblks_t len,
+ xfs_fileoff_t obno,
+ xfs_fileoff_t end,
+ int n,
+ int flags)
+{
+ if ((flags & XFS_BMAPI_ENTIRE) ||
+ got->br_startoff + got->br_blockcount <= obno) {
+ *mval = *got;
+ if (isnullstartblock(got->br_startblock))
+ mval->br_startblock = DELAYSTARTBLOCK;
+ return;
+ }
+
+ if (obno > *bno)
+ *bno = obno;
+ ASSERT((*bno >= obno) || (n == 0));
+ ASSERT(*bno < end);
+ mval->br_startoff = *bno;
+ if (isnullstartblock(got->br_startblock))
+ mval->br_startblock = DELAYSTARTBLOCK;
+ else
+ mval->br_startblock = got->br_startblock +
+ (*bno - got->br_startoff);
+ /*
+ * Return the minimum of what we got and what we asked for for
+ * the length. We can use the len variable here because it is
+ * modified below and we could have been there before coming
+ * here if the first part of the allocation didn't overlap what
+ * was asked for.
+ */
+ mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
+ got->br_blockcount - (*bno - got->br_startoff));
+ mval->br_state = got->br_state;
+ ASSERT(mval->br_blockcount <= len);
+ return;
+}
+
+/*
+ * Update and validate the extent map to return
+ */
+STATIC void
+xfs_bmapi_update_map(
+ struct xfs_bmbt_irec **map,
+ xfs_fileoff_t *bno,
+ xfs_filblks_t *len,
+ xfs_fileoff_t obno,
+ xfs_fileoff_t end,
+ int *n,
+ int flags)
+{
+ xfs_bmbt_irec_t *mval = *map;
+
+ ASSERT((flags & XFS_BMAPI_ENTIRE) ||
+ ((mval->br_startoff + mval->br_blockcount) <= end));
+ ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
+ (mval->br_startoff < obno));
+
+ *bno = mval->br_startoff + mval->br_blockcount;
+ *len = end - *bno;
+ if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
+ /* update previous map with new information */
+ ASSERT(mval->br_startblock == mval[-1].br_startblock);
+ ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
+ ASSERT(mval->br_state == mval[-1].br_state);
+ mval[-1].br_blockcount = mval->br_blockcount;
+ mval[-1].br_state = mval->br_state;
+ } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
+ mval[-1].br_startblock != DELAYSTARTBLOCK &&
+ mval[-1].br_startblock != HOLESTARTBLOCK &&
+ mval->br_startblock == mval[-1].br_startblock +
+ mval[-1].br_blockcount &&
+ ((flags & XFS_BMAPI_IGSTATE) ||
+ mval[-1].br_state == mval->br_state)) {
+ ASSERT(mval->br_startoff ==
+ mval[-1].br_startoff + mval[-1].br_blockcount);
+ mval[-1].br_blockcount += mval->br_blockcount;
+ } else if (*n > 0 &&
+ mval->br_startblock == DELAYSTARTBLOCK &&
+ mval[-1].br_startblock == DELAYSTARTBLOCK &&
+ mval->br_startoff ==
+ mval[-1].br_startoff + mval[-1].br_blockcount) {
+ mval[-1].br_blockcount += mval->br_blockcount;
+ mval[-1].br_state = mval->br_state;
+ } else if (!((*n == 0) &&
+ ((mval->br_startoff + mval->br_blockcount) <=
+ obno))) {
+ mval++;
+ (*n)++;
+ }
+ *map = mval;
+}
+
+/*
+ * Map file blocks to filesystem blocks without allocation.
+ */
+int
+xfs_bmapi_read(
+ struct xfs_inode *ip,
+ xfs_fileoff_t bno,
+ xfs_filblks_t len,
+ struct xfs_bmbt_irec *mval,
+ int *nmap,
+ int flags)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp;
+ struct xfs_bmbt_irec got;
+ struct xfs_bmbt_irec prev;
+ xfs_fileoff_t obno;
+ xfs_fileoff_t end;
+ xfs_extnum_t lastx;
+ int error;
+ int eof;
+ int n = 0;
+ int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+
+ ASSERT(*nmap >= 1);
+ ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
+ XFS_BMAPI_IGSTATE)));
+
+ if (unlikely(XFS_TEST_ERROR(
+ (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
+ mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
+ XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ XFS_STATS_INC(xs_blk_mapr);
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+
+ if (!(ifp->if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, whichfork);
+ if (error)
+ return error;
+ }
+
+ xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev);
+ end = bno + len;
+ obno = bno;
+
+ while (bno < end && n < *nmap) {
+ /* Reading past eof, act as though there's a hole up to end. */
+ if (eof)
+ got.br_startoff = end;
+ if (got.br_startoff > bno) {
+ /* Reading in a hole. */
+ mval->br_startoff = bno;
+ mval->br_startblock = HOLESTARTBLOCK;
+ mval->br_blockcount =
+ XFS_FILBLKS_MIN(len, got.br_startoff - bno);
+ mval->br_state = XFS_EXT_NORM;
+ bno += mval->br_blockcount;
+ len -= mval->br_blockcount;
+ mval++;
+ n++;
+ continue;
+ }
+
+ /* set up the extent map to return. */
+ xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
+ xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
+
+ /* If we're done, stop now. */
+ if (bno >= end || n >= *nmap)
+ break;
+
+ /* Else go on to the next record. */
+ if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
+ else
+ eof = 1;
+ }
+ *nmap = n;
+ return 0;
+}
+
+STATIC int
+xfs_bmapi_reserve_delalloc(
+ struct xfs_inode *ip,
+ xfs_fileoff_t aoff,
+ xfs_filblks_t len,
+ struct xfs_bmbt_irec *got,
+ struct xfs_bmbt_irec *prev,
+ xfs_extnum_t *lastx,
+ int eof)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ xfs_extlen_t alen;
+ xfs_extlen_t indlen;
+ char rt = XFS_IS_REALTIME_INODE(ip);
+ xfs_extlen_t extsz;
+ int error;
+
+ alen = XFS_FILBLKS_MIN(len, MAXEXTLEN);
+ if (!eof)
+ alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
+
+ /* Figure out the extent size, adjust alen */
+ extsz = xfs_get_extsz_hint(ip);
+ if (extsz) {
+ /*
+ * Make sure we don't exceed a single extent length when we
+ * align the extent by reducing length we are going to
+ * allocate by the maximum amount extent size aligment may
+ * require.
+ */
+ alen = XFS_FILBLKS_MIN(len, MAXEXTLEN - (2 * extsz - 1));
+ error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof,
+ 1, 0, &aoff, &alen);
+ ASSERT(!error);
+ }
+
+ if (rt)
+ extsz = alen / mp->m_sb.sb_rextsize;
+
+ /*
+ * Make a transaction-less quota reservation for delayed allocation
+ * blocks. This number gets adjusted later. We return if we haven't
+ * allocated blocks already inside this loop.
+ */
+ error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
+ rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
+ if (error)
+ return error;
+
+ /*
+ * Split changing sb for alen and indlen since they could be coming
+ * from different places.
+ */
+ indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
+ ASSERT(indlen > 0);
+
+ if (rt) {
+ error = xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
+ -((int64_t)extsz), 0);
+ } else {
+ error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
+ -((int64_t)alen), 0);
+ }
+
+ if (error)
+ goto out_unreserve_quota;
+
+ error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
+ -((int64_t)indlen), 0);
+ if (error)
+ goto out_unreserve_blocks;
+
+
+ ip->i_delayed_blks += alen;
+
+ got->br_startoff = aoff;
+ got->br_startblock = nullstartblock(indlen);
+ got->br_blockcount = alen;
+ got->br_state = XFS_EXT_NORM;
+ xfs_bmap_add_extent_hole_delay(ip, lastx, got);
+
+ /*
+ * Update our extent pointer, given that xfs_bmap_add_extent_hole_delay
+ * might have merged it into one of the neighbouring ones.
+ */
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got);
+
+ ASSERT(got->br_startoff <= aoff);
+ ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen);
+ ASSERT(isnullstartblock(got->br_startblock));
+ ASSERT(got->br_state == XFS_EXT_NORM);
+ return 0;
+
+out_unreserve_blocks:
+ if (rt)
+ xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS, extsz, 0);
+ else
+ xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, alen, 0);
+out_unreserve_quota:
+ if (XFS_IS_QUOTA_ON(mp))
+ xfs_trans_unreserve_quota_nblks(NULL, ip, alen, 0, rt ?
+ XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
+ return error;
+}
+
+/*
+ * Map file blocks to filesystem blocks, adding delayed allocations as needed.
+ */
+int
+xfs_bmapi_delay(
+ struct xfs_inode *ip, /* incore inode */
+ xfs_fileoff_t bno, /* starting file offs. mapped */
+ xfs_filblks_t len, /* length to map in file */
+ struct xfs_bmbt_irec *mval, /* output: map values */
+ int *nmap, /* i/o: mval size/count */
+ int flags) /* XFS_BMAPI_... */
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ struct xfs_bmbt_irec got; /* current file extent record */
+ struct xfs_bmbt_irec prev; /* previous file extent record */
+ xfs_fileoff_t obno; /* old block number (offset) */
+ xfs_fileoff_t end; /* end of mapped file region */
+ xfs_extnum_t lastx; /* last useful extent number */
+ int eof; /* we've hit the end of extents */
+ int n = 0; /* current extent index */
+ int error = 0;
+
+ ASSERT(*nmap >= 1);
+ ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
+ ASSERT(!(flags & ~XFS_BMAPI_ENTIRE));
+
+ if (unlikely(XFS_TEST_ERROR(
+ (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
+ mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
+ XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ XFS_STATS_INC(xs_blk_mapw);
+
+ if (!(ifp->if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
+ if (error)
+ return error;
+ }
+
+ xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev);
+ end = bno + len;
+ obno = bno;
+
+ while (bno < end && n < *nmap) {
+ if (eof || got.br_startoff > bno) {
+ error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
+ &prev, &lastx, eof);
+ if (error) {
+ if (n == 0) {
+ *nmap = 0;
+ return error;
+ }
+ break;
+ }
+ }
+
+ /* set up the extent map to return. */
+ xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
+ xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
+
+ /* If we're done, stop now. */
+ if (bno >= end || n >= *nmap)
+ break;
+
+ /* Else go on to the next record. */
+ prev = got;
+ if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
+ else
+ eof = 1;
+ }
+
+ *nmap = n;
+ return 0;
+}
+
+
+STATIC int
+xfs_bmapi_allocate(
+ struct xfs_bmalloca *bma,
+ int flags)
+{
+ struct xfs_mount *mp = bma->ip->i_mount;
+ int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
+ int tmp_logflags = 0;
+ int error;
+ int rt;
+
+ ASSERT(bma->length > 0);
+
+ rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(bma->ip);
+
+ /*
+ * For the wasdelay case, we could also just allocate the stuff asked
+ * for in this bmap call but that wouldn't be as good.
+ */
+ if (bma->wasdel) {
+ bma->length = (xfs_extlen_t)bma->got.br_blockcount;
+ bma->offset = bma->got.br_startoff;
+ if (bma->idx != NULLEXTNUM && bma->idx) {
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1),
+ &bma->prev);
+ }
+ } else {
+ bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
+ if (!bma->eof)
+ bma->length = XFS_FILBLKS_MIN(bma->length,
+ bma->got.br_startoff - bma->offset);
+ }
+
+ /*
+ * Indicate if this is the first user data in the file, or just any
+ * user data.
+ */
+ if (!(flags & XFS_BMAPI_METADATA)) {
+ bma->userdata = (bma->offset == 0) ?
+ XFS_ALLOC_INITIAL_USER_DATA : XFS_ALLOC_USERDATA;
+ }
+
+ bma->minlen = (flags & XFS_BMAPI_CONTIG) ? bma->length : 1;
+
+ /*
+ * Only want to do the alignment at the eof if it is userdata and
+ * allocation length is larger than a stripe unit.
+ */
+ if (mp->m_dalign && bma->length >= mp->m_dalign &&
+ !(flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {
+ error = xfs_bmap_isaeof(bma, whichfork);
+ if (error)
+ return error;
+ }
+
+ error = xfs_bmap_alloc(bma);
+ if (error)
+ return error;
+
+ if (bma->flist->xbf_low)
+ bma->minleft = 0;
+ if (bma->cur)
+ bma->cur->bc_private.b.firstblock = *bma->firstblock;
+ if (bma->blkno == NULLFSBLOCK)
+ return 0;
+ if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
+ bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
+ bma->cur->bc_private.b.firstblock = *bma->firstblock;
+ bma->cur->bc_private.b.flist = bma->flist;
+ }
+ /*
+ * Bump the number of extents we've allocated
+ * in this call.
+ */
+ bma->nallocs++;
+
+ if (bma->cur)
+ bma->cur->bc_private.b.flags =
+ bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
+
+ bma->got.br_startoff = bma->offset;
+ bma->got.br_startblock = bma->blkno;
+ bma->got.br_blockcount = bma->length;
+ bma->got.br_state = XFS_EXT_NORM;
+
+ /*
+ * A wasdelay extent has been initialized, so shouldn't be flagged
+ * as unwritten.
+ */
+ if (!bma->wasdel && (flags & XFS_BMAPI_PREALLOC) &&
+ xfs_sb_version_hasextflgbit(&mp->m_sb))
+ bma->got.br_state = XFS_EXT_UNWRITTEN;
+
+ if (bma->wasdel)
+ error = xfs_bmap_add_extent_delay_real(bma);
+ else
+ error = xfs_bmap_add_extent_hole_real(bma, whichfork);
+
+ bma->logflags |= tmp_logflags;
+ if (error)
+ return error;
+
+ /*
+ * Update our extent pointer, given that xfs_bmap_add_extent_delay_real
+ * or xfs_bmap_add_extent_hole_real might have merged it into one of
+ * the neighbouring ones.
+ */
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
+
+ ASSERT(bma->got.br_startoff <= bma->offset);
+ ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
+ bma->offset + bma->length);
+ ASSERT(bma->got.br_state == XFS_EXT_NORM ||
+ bma->got.br_state == XFS_EXT_UNWRITTEN);
+ return 0;
+}
+
+STATIC int
+xfs_bmapi_convert_unwritten(
+ struct xfs_bmalloca *bma,
+ struct xfs_bmbt_irec *mval,
+ xfs_filblks_t len,
+ int flags)
+{
+ int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
+ int tmp_logflags = 0;
+ int error;
+
+ /* check if we need to do unwritten->real conversion */
+ if (mval->br_state == XFS_EXT_UNWRITTEN &&
+ (flags & XFS_BMAPI_PREALLOC))
+ return 0;
+
+ /* check if we need to do real->unwritten conversion */
+ if (mval->br_state == XFS_EXT_NORM &&
+ (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
+ (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
+ return 0;
+
+ /*
+ * Modify (by adding) the state flag, if writing.
+ */
+ ASSERT(mval->br_blockcount <= len);
+ if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
+ bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
+ bma->ip, whichfork);
+ bma->cur->bc_private.b.firstblock = *bma->firstblock;
+ bma->cur->bc_private.b.flist = bma->flist;
+ }
+ mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
+ ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
+
+ error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, &bma->idx,
+ &bma->cur, mval, bma->firstblock, bma->flist,
+ &tmp_logflags);
+ bma->logflags |= tmp_logflags;
+ if (error)
+ return error;
+
+ /*
+ * Update our extent pointer, given that
+ * xfs_bmap_add_extent_unwritten_real might have merged it into one
+ * of the neighbouring ones.
+ */
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
+
+ /*
+ * We may have combined previously unwritten space with written space,
+ * so generate another request.
+ */
+ if (mval->br_blockcount < len)
+ return EAGAIN;
+ return 0;
+}
+
+/*
+ * Map file blocks to filesystem blocks, and allocate blocks or convert the
+ * extent state if necessary. Details behaviour is controlled by the flags
+ * parameter. Only allocates blocks from a single allocation group, to avoid
+ * locking problems.
+ *
+ * The returned value in "firstblock" from the first call in a transaction
+ * must be remembered and presented to subsequent calls in "firstblock".
+ * An upper bound for the number of blocks to be allocated is supplied to
+ * the first call in "total"; if no allocation group has that many free
+ * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
+ */
+int
+xfs_bmapi_write(
+ struct xfs_trans *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode */
+ xfs_fileoff_t bno, /* starting file offs. mapped */
+ xfs_filblks_t len, /* length to map in file */
+ int flags, /* XFS_BMAPI_... */
+ xfs_fsblock_t *firstblock, /* first allocated block
+ controls a.g. for allocs */
+ xfs_extlen_t total, /* total blocks needed */
+ struct xfs_bmbt_irec *mval, /* output: map values */
+ int *nmap, /* i/o: mval size/count */
+ struct xfs_bmap_free *flist) /* i/o: list extents to free */
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp;
+ struct xfs_bmalloca bma = { 0 }; /* args for xfs_bmap_alloc */
+ xfs_fileoff_t end; /* end of mapped file region */
+ int eof; /* after the end of extents */
+ int error; /* error return */
+ int n; /* current extent index */
+ xfs_fileoff_t obno; /* old block number (offset) */
+ int whichfork; /* data or attr fork */
+ char inhole; /* current location is hole in file */
+ char wasdelay; /* old extent was delayed */
+
+#ifdef DEBUG
+ xfs_fileoff_t orig_bno; /* original block number value */
+ int orig_flags; /* original flags arg value */
+ xfs_filblks_t orig_len; /* original value of len arg */
+ struct xfs_bmbt_irec *orig_mval; /* original value of mval */
+ int orig_nmap; /* original value of *nmap */
+
+ orig_bno = bno;
+ orig_len = len;
+ orig_flags = flags;
+ orig_mval = mval;
+ orig_nmap = *nmap;
+#endif
+
+ ASSERT(*nmap >= 1);
+ ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
+ ASSERT(!(flags & XFS_BMAPI_IGSTATE));
+ ASSERT(tp != NULL);
+ ASSERT(len > 0);
+
+ whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+
+ if (unlikely(XFS_TEST_ERROR(
+ (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
+ mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
+ XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+
+ XFS_STATS_INC(xs_blk_mapw);
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+ error = xfs_bmap_local_to_extents(tp, ip, firstblock, total,
+ &bma.logflags, whichfork);
+ if (error)
+ goto error0;
+ }
+
+ if (*firstblock == NULLFSBLOCK) {
+ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
+ bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
+ else
+ bma.minleft = 1;
+ } else {
+ bma.minleft = 0;
+ }
+
+ if (!(ifp->if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(tp, ip, whichfork);
+ if (error)
+ goto error0;
+ }
+
+ xfs_bmap_search_extents(ip, bno, whichfork, &eof, &bma.idx, &bma.got,
+ &bma.prev);
+ n = 0;
+ end = bno + len;
+ obno = bno;
+
+ bma.tp = tp;
+ bma.ip = ip;
+ bma.total = total;
+ bma.userdata = 0;
+ bma.flist = flist;
+ bma.firstblock = firstblock;
+
+ while (bno < end && n < *nmap) {
+ inhole = eof || bma.got.br_startoff > bno;
+ wasdelay = !inhole && isnullstartblock(bma.got.br_startblock);
+
+ /*
+ * First, deal with the hole before the allocated space
+ * that we found, if any.
+ */
+ if (inhole || wasdelay) {
+ bma.eof = eof;
+ bma.conv = !!(flags & XFS_BMAPI_CONVERT);
+ bma.wasdel = wasdelay;
+ bma.offset = bno;
+
+ /*
+ * There's a 32/64 bit type mismatch between the
+ * allocation length request (which can be 64 bits in
+ * length) and the bma length request, which is
+ * xfs_extlen_t and therefore 32 bits. Hence we have to
+ * check for 32-bit overflows and handle them here.
+ */
+ if (len > (xfs_filblks_t)MAXEXTLEN)
+ bma.length = MAXEXTLEN;
+ else
+ bma.length = len;
+
+ ASSERT(len > 0);
+ ASSERT(bma.length > 0);
+ error = xfs_bmapi_allocate(&bma, flags);
+ if (error)
+ goto error0;
+ if (bma.blkno == NULLFSBLOCK)
+ break;
+ }
+
+ /* Deal with the allocated space we found. */
+ xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
+ end, n, flags);
+
+ /* Execute unwritten extent conversion if necessary */
+ error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
+ if (error == EAGAIN)
+ continue;
+ if (error)
+ goto error0;
+
+ /* update the extent map to return */
+ xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
+
+ /*
+ * If we're done, stop now. Stop when we've allocated
+ * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
+ * the transaction may get too big.
+ */
+ if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
+ break;
+
+ /* Else go on to the next record. */
+ bma.prev = bma.got;
+ if (++bma.idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) {
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma.idx),
+ &bma.got);
+ } else
+ eof = 1;
+ }
+ *nmap = n;
+
+ /*
+ * Transform from btree to extents, give it cur.
+ */
+ if (xfs_bmap_wants_extents(ip, whichfork)) {
+ int tmp_logflags = 0;
+
+ ASSERT(bma.cur);
+ error = xfs_bmap_btree_to_extents(tp, ip, bma.cur,
+ &tmp_logflags, whichfork);
+ bma.logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ }
+
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
+ XFS_IFORK_NEXTENTS(ip, whichfork) >
+ XFS_IFORK_MAXEXT(ip, whichfork));
+ error = 0;
+error0:
+ /*
+ * Log everything. Do this after conversion, there's no point in
+ * logging the extent records if we've converted to btree format.
+ */
+ if ((bma.logflags & xfs_ilog_fext(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+ bma.logflags &= ~xfs_ilog_fext(whichfork);
+ else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
+ bma.logflags &= ~xfs_ilog_fbroot(whichfork);
+ /*
+ * Log whatever the flags say, even if error. Otherwise we might miss
+ * detecting a case where the data is changed, there's an error,
+ * and it's not logged so we don't shutdown when we should.
+ */
+ if (bma.logflags)
+ xfs_trans_log_inode(tp, ip, bma.logflags);
+
+ if (bma.cur) {
+ if (!error) {
+ ASSERT(*firstblock == NULLFSBLOCK ||
+ XFS_FSB_TO_AGNO(mp, *firstblock) ==
+ XFS_FSB_TO_AGNO(mp,
+ bma.cur->bc_private.b.firstblock) ||
+ (flist->xbf_low &&
+ XFS_FSB_TO_AGNO(mp, *firstblock) <
+ XFS_FSB_TO_AGNO(mp,
+ bma.cur->bc_private.b.firstblock)));
+ *firstblock = bma.cur->bc_private.b.firstblock;
+ }
+ xfs_btree_del_cursor(bma.cur,
+ error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+ }
+ if (!error)
+ xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
+ orig_nmap, *nmap);
+ return error;
+}
+
+/*
+ * Unmap (remove) blocks from a file.
+ * If nexts is nonzero then the number of extents to remove is limited to
+ * that value. If not all extents in the block range can be removed then
+ * *done is set.
+ */
+int /* error */
+xfs_bunmapi(
+ xfs_trans_t *tp, /* transaction pointer */
+ struct xfs_inode *ip, /* incore inode */
+ xfs_fileoff_t bno, /* starting offset to unmap */
+ xfs_filblks_t len, /* length to unmap in file */
+ int flags, /* misc flags */
+ xfs_extnum_t nexts, /* number of extents max */
+ xfs_fsblock_t *firstblock, /* first allocated block
+ controls a.g. for allocs */
+ xfs_bmap_free_t *flist, /* i/o: list extents to free */
+ int *done) /* set if not done yet */
+{
+ xfs_btree_cur_t *cur; /* bmap btree cursor */
+ xfs_bmbt_irec_t del; /* extent being deleted */
+ int eof; /* is deleting at eof */
+ xfs_bmbt_rec_host_t *ep; /* extent record pointer */
+ int error; /* error return value */
+ xfs_extnum_t extno; /* extent number in list */
+ xfs_bmbt_irec_t got; /* current extent record */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ int isrt; /* freeing in rt area */
+ xfs_extnum_t lastx; /* last extent index used */
+ int logflags; /* transaction logging flags */
+ xfs_extlen_t mod; /* rt extent offset */
+ xfs_mount_t *mp; /* mount structure */
+ xfs_extnum_t nextents; /* number of file extents */
+ xfs_bmbt_irec_t prev; /* previous extent record */
+ xfs_fileoff_t start; /* first file offset deleted */
+ int tmp_logflags; /* partial logging flags */
+ int wasdel; /* was a delayed alloc extent */
+ int whichfork; /* data or attribute fork */
+ xfs_fsblock_t sum;
+
+ trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
+
+ whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+ XFS_ATTR_FORK : XFS_DATA_FORK;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if (unlikely(
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
+ XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ mp = ip->i_mount;
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ ASSERT(len > 0);
+ ASSERT(nexts >= 0);
+
+ if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+ (error = xfs_iread_extents(tp, ip, whichfork)))
+ return error;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ if (nextents == 0) {
+ *done = 1;
+ return 0;
+ }
+ XFS_STATS_INC(xs_blk_unmap);
+ isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
+ start = bno;
+ bno = start + len - 1;
+ ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+ &prev);
+
+ /*
+ * Check to see if the given block number is past the end of the
+ * file, back up to the last block if so...
+ */
+ if (eof) {
+ ep = xfs_iext_get_ext(ifp, --lastx);
+ xfs_bmbt_get_all(ep, &got);
+ bno = got.br_startoff + got.br_blockcount - 1;
+ }
+ logflags = 0;
+ if (ifp->if_flags & XFS_IFBROOT) {
+ ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
+ cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
+ cur->bc_private.b.firstblock = *firstblock;
+ cur->bc_private.b.flist = flist;
+ cur->bc_private.b.flags = 0;
+ } else
+ cur = NULL;
+
+ if (isrt) {
+ /*
+ * Synchronize by locking the bitmap inode.
+ */
+ xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
+ }
+
+ extno = 0;
+ while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
+ (nexts == 0 || extno < nexts)) {
+ /*
+ * Is the found extent after a hole in which bno lives?
+ * Just back up to the previous extent, if so.
+ */
+ if (got.br_startoff > bno) {
+ if (--lastx < 0)
+ break;
+ ep = xfs_iext_get_ext(ifp, lastx);
+ xfs_bmbt_get_all(ep, &got);
+ }
+ /*
+ * Is the last block of this extent before the range
+ * we're supposed to delete? If so, we're done.
+ */
+ bno = XFS_FILEOFF_MIN(bno,
+ got.br_startoff + got.br_blockcount - 1);
+ if (bno < start)
+ break;
+ /*
+ * Then deal with the (possibly delayed) allocated space
+ * we found.
+ */
+ ASSERT(ep != NULL);
+ del = got;
+ wasdel = isnullstartblock(del.br_startblock);
+ if (got.br_startoff < start) {
+ del.br_startoff = start;
+ del.br_blockcount -= start - got.br_startoff;
+ if (!wasdel)
+ del.br_startblock += start - got.br_startoff;
+ }
+ if (del.br_startoff + del.br_blockcount > bno + 1)
+ del.br_blockcount = bno + 1 - del.br_startoff;
+ sum = del.br_startblock + del.br_blockcount;
+ if (isrt &&
+ (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
+ /*
+ * Realtime extent not lined up at the end.
+ * The extent could have been split into written
+ * and unwritten pieces, or we could just be
+ * unmapping part of it. But we can't really
+ * get rid of part of a realtime extent.
+ */
+ if (del.br_state == XFS_EXT_UNWRITTEN ||
+ !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
+ /*
+ * This piece is unwritten, or we're not
+ * using unwritten extents. Skip over it.
+ */
+ ASSERT(bno >= mod);
+ bno -= mod > del.br_blockcount ?
+ del.br_blockcount : mod;
+ if (bno < got.br_startoff) {
+ if (--lastx >= 0)
+ xfs_bmbt_get_all(xfs_iext_get_ext(
+ ifp, lastx), &got);
+ }
+ continue;
+ }
+ /*
+ * It's written, turn it unwritten.
+ * This is better than zeroing it.
+ */
+ ASSERT(del.br_state == XFS_EXT_NORM);
+ ASSERT(xfs_trans_get_block_res(tp) > 0);
+ /*
+ * If this spans a realtime extent boundary,
+ * chop it back to the start of the one we end at.
+ */
+ if (del.br_blockcount > mod) {
+ del.br_startoff += del.br_blockcount - mod;
+ del.br_startblock += del.br_blockcount - mod;
+ del.br_blockcount = mod;
+ }
+ del.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent_unwritten_real(tp, ip,
+ &lastx, &cur, &del, firstblock, flist,
+ &logflags);
+ if (error)
+ goto error0;
+ goto nodelete;
+ }
+ if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
+ /*
+ * Realtime extent is lined up at the end but not
+ * at the front. We'll get rid of full extents if
+ * we can.
+ */
+ mod = mp->m_sb.sb_rextsize - mod;
+ if (del.br_blockcount > mod) {
+ del.br_blockcount -= mod;
+ del.br_startoff += mod;
+ del.br_startblock += mod;
+ } else if ((del.br_startoff == start &&
+ (del.br_state == XFS_EXT_UNWRITTEN ||
+ xfs_trans_get_block_res(tp) == 0)) ||
+ !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
+ /*
+ * Can't make it unwritten. There isn't
+ * a full extent here so just skip it.
+ */
+ ASSERT(bno >= del.br_blockcount);
+ bno -= del.br_blockcount;
+ if (got.br_startoff > bno) {
+ if (--lastx >= 0) {
+ ep = xfs_iext_get_ext(ifp,
+ lastx);
+ xfs_bmbt_get_all(ep, &got);
+ }
+ }
+ continue;
+ } else if (del.br_state == XFS_EXT_UNWRITTEN) {
+ /*
+ * This one is already unwritten.
+ * It must have a written left neighbor.
+ * Unwrite the killed part of that one and
+ * try again.
+ */
+ ASSERT(lastx > 0);
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp,
+ lastx - 1), &prev);
+ ASSERT(prev.br_state == XFS_EXT_NORM);
+ ASSERT(!isnullstartblock(prev.br_startblock));
+ ASSERT(del.br_startblock ==
+ prev.br_startblock + prev.br_blockcount);
+ if (prev.br_startoff < start) {
+ mod = start - prev.br_startoff;
+ prev.br_blockcount -= mod;
+ prev.br_startblock += mod;
+ prev.br_startoff = start;
+ }
+ prev.br_state = XFS_EXT_UNWRITTEN;
+ lastx--;
+ error = xfs_bmap_add_extent_unwritten_real(tp,
+ ip, &lastx, &cur, &prev,
+ firstblock, flist, &logflags);
+ if (error)
+ goto error0;
+ goto nodelete;
+ } else {
+ ASSERT(del.br_state == XFS_EXT_NORM);
+ del.br_state = XFS_EXT_UNWRITTEN;
+ error = xfs_bmap_add_extent_unwritten_real(tp,
+ ip, &lastx, &cur, &del,
+ firstblock, flist, &logflags);
+ if (error)
+ goto error0;
+ goto nodelete;
+ }
+ }
+ if (wasdel) {
+ ASSERT(startblockval(del.br_startblock) > 0);
+ /* Update realtime/data freespace, unreserve quota */
+ if (isrt) {
+ xfs_filblks_t rtexts;
+
+ rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
+ do_div(rtexts, mp->m_sb.sb_rextsize);
+ xfs_mod_incore_sb(mp, XFS_SBS_FREXTENTS,
+ (int64_t)rtexts, 0);
+ (void)xfs_trans_reserve_quota_nblks(NULL,
+ ip, -((long)del.br_blockcount), 0,
+ XFS_QMOPT_RES_RTBLKS);
+ } else {
+ xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
+ (int64_t)del.br_blockcount, 0);
+ (void)xfs_trans_reserve_quota_nblks(NULL,
+ ip, -((long)del.br_blockcount), 0,
+ XFS_QMOPT_RES_REGBLKS);
+ }
+ ip->i_delayed_blks -= del.br_blockcount;
+ if (cur)
+ cur->bc_private.b.flags |=
+ XFS_BTCUR_BPRV_WASDEL;
+ } else if (cur)
+ cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
+ /*
+ * If it's the case where the directory code is running
+ * with no block reservation, and the deleted block is in
+ * the middle of its extent, and the resulting insert
+ * of an extent would cause transformation to btree format,
+ * then reject it. The calling code will then swap
+ * blocks around instead.
+ * We have to do this now, rather than waiting for the
+ * conversion to btree format, since the transaction
+ * will be dirty.
+ */
+ if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
+ XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_NEXTENTS(ip, whichfork) >= /* Note the >= */
+ XFS_IFORK_MAXEXT(ip, whichfork) &&
+ del.br_startoff > got.br_startoff &&
+ del.br_startoff + del.br_blockcount <
+ got.br_startoff + got.br_blockcount) {
+ error = XFS_ERROR(ENOSPC);
+ goto error0;
+ }
+ error = xfs_bmap_del_extent(ip, tp, &lastx, flist, cur, &del,
+ &tmp_logflags, whichfork);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ bno = del.br_startoff - 1;
+nodelete:
+ /*
+ * If not done go on to the next (previous) record.
+ */
+ if (bno != (xfs_fileoff_t)-1 && bno >= start) {
+ if (lastx >= 0) {
+ ep = xfs_iext_get_ext(ifp, lastx);
+ if (xfs_bmbt_get_startoff(ep) > bno) {
+ if (--lastx >= 0)
+ ep = xfs_iext_get_ext(ifp,
+ lastx);
+ }
+ xfs_bmbt_get_all(ep, &got);
+ }
+ extno++;
+ }
+ }
+ *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
+
+ /*
+ * Convert to a btree if necessary.
+ */
+ if (xfs_bmap_needs_btree(ip, whichfork)) {
+ ASSERT(cur == NULL);
+ error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
+ &cur, 0, &tmp_logflags, whichfork);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ }
+ /*
+ * transform from btree to extents, give it cur
+ */
+ else if (xfs_bmap_wants_extents(ip, whichfork)) {
+ ASSERT(cur != NULL);
+ error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
+ whichfork);
+ logflags |= tmp_logflags;
+ if (error)
+ goto error0;
+ }
+ /*
+ * transform from extents to local?
+ */
+ error = 0;
+error0:
+ /*
+ * Log everything. Do this after conversion, there's no point in
+ * logging the extent records if we've converted to btree format.
+ */
+ if ((logflags & xfs_ilog_fext(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+ logflags &= ~xfs_ilog_fext(whichfork);
+ else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
+ logflags &= ~xfs_ilog_fbroot(whichfork);
+ /*
+ * Log inode even in the error case, if the transaction
+ * is dirty we'll need to shut down the filesystem.
+ */
+ if (logflags)
+ xfs_trans_log_inode(tp, ip, logflags);
+ if (cur) {
+ if (!error) {
+ *firstblock = cur->bc_private.b.firstblock;
+ cur->bc_private.b.allocated = 0;
+ }
+ xfs_btree_del_cursor(cur,
+ error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+ }
+ return error;
+}
+
+/*
+ * returns 1 for success, 0 if we failed to map the extent.
+ */
+STATIC int
+xfs_getbmapx_fix_eof_hole(
+ xfs_inode_t *ip, /* xfs incore inode pointer */
+ struct getbmapx *out, /* output structure */
+ int prealloced, /* this is a file with
+ * preallocated data space */
+ __int64_t end, /* last block requested */
+ xfs_fsblock_t startblock)
+{
+ __int64_t fixlen;
+ xfs_mount_t *mp; /* file system mount point */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t lastx; /* last extent pointer */
+ xfs_fileoff_t fileblock;
+
+ if (startblock == HOLESTARTBLOCK) {
+ mp = ip->i_mount;
+ out->bmv_block = -1;
+ fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip)));
+ fixlen -= out->bmv_offset;
+ if (prealloced && out->bmv_offset + out->bmv_length == end) {
+ /* Came to hole at EOF. Trim it. */
+ if (fixlen <= 0)
+ return 0;
+ out->bmv_length = fixlen;
+ }
+ } else {
+ if (startblock == DELAYSTARTBLOCK)
+ out->bmv_block = -2;
+ else
+ out->bmv_block = xfs_fsb_to_db(ip, startblock);
+ fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
+ ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
+ (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
+ out->bmv_oflags |= BMV_OF_LAST;
+ }
+
+ return 1;
+}
+
+/*
+ * Get inode's extents as described in bmv, and format for output.
+ * Calls formatter to fill the user's buffer until all extents
+ * are mapped, until the passed-in bmv->bmv_count slots have
+ * been filled, or until the formatter short-circuits the loop,
+ * if it is tracking filled-in extents on its own.
+ */
+int /* error code */
+xfs_getbmap(
+ xfs_inode_t *ip,
+ struct getbmapx *bmv, /* user bmap structure */
+ xfs_bmap_format_t formatter, /* format to user */
+ void *arg) /* formatter arg */
+{
+ __int64_t bmvend; /* last block requested */
+ int error = 0; /* return value */
+ __int64_t fixlen; /* length for -1 case */
+ int i; /* extent number */
+ int lock; /* lock state */
+ xfs_bmbt_irec_t *map; /* buffer for user's data */
+ xfs_mount_t *mp; /* file system mount point */
+ int nex; /* # of user extents can do */
+ int nexleft; /* # of user extents left */
+ int subnex; /* # of bmapi's can do */
+ int nmap; /* number of map entries */
+ struct getbmapx *out; /* output structure */
+ int whichfork; /* data or attr fork */
+ int prealloced; /* this is a file with
+ * preallocated data space */
+ int iflags; /* interface flags */
+ int bmapi_flags; /* flags for xfs_bmapi */
+ int cur_ext = 0;
+
+ mp = ip->i_mount;
+ iflags = bmv->bmv_iflags;
+ whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
+
+ if (whichfork == XFS_ATTR_FORK) {
+ if (XFS_IFORK_Q(ip)) {
+ if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
+ ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
+ ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
+ return XFS_ERROR(EINVAL);
+ } else if (unlikely(
+ ip->i_d.di_aformat != 0 &&
+ ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
+ XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
+ ip->i_mount);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ prealloced = 0;
+ fixlen = 1LL << 32;
+ } else {
+ if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
+ ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
+ ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
+ return XFS_ERROR(EINVAL);
+
+ if (xfs_get_extsz_hint(ip) ||
+ ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
+ prealloced = 1;
+ fixlen = XFS_MAXIOFFSET(mp);
+ } else {
+ prealloced = 0;
+ fixlen = XFS_ISIZE(ip);
+ }
+ }
+
+ if (bmv->bmv_length == -1) {
+ fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
+ bmv->bmv_length =
+ max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
+ } else if (bmv->bmv_length == 0) {
+ bmv->bmv_entries = 0;
+ return 0;
+ } else if (bmv->bmv_length < 0) {
+ return XFS_ERROR(EINVAL);
+ }
+
+ nex = bmv->bmv_count - 1;
+ if (nex <= 0)
+ return XFS_ERROR(EINVAL);
+ bmvend = bmv->bmv_offset + bmv->bmv_length;
+
+
+ if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
+ return XFS_ERROR(ENOMEM);
+ out = kmem_zalloc(bmv->bmv_count * sizeof(struct getbmapx), KM_MAYFAIL);
+ if (!out) {
+ out = kmem_zalloc_large(bmv->bmv_count *
+ sizeof(struct getbmapx));
+ if (!out)
+ return XFS_ERROR(ENOMEM);
+ }
+
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
+ if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
+ if (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size) {
+ error = xfs_flush_pages(ip, 0, -1, 0, FI_REMAPF);
+ if (error)
+ goto out_unlock_iolock;
+ }
+ /*
+ * even after flushing the inode, there can still be delalloc
+ * blocks on the inode beyond EOF due to speculative
+ * preallocation. These are not removed until the release
+ * function is called or the inode is inactivated. Hence we
+ * cannot assert here that ip->i_delayed_blks == 0.
+ */
+ }
+
+ lock = xfs_ilock_map_shared(ip);
+
+ /*
+ * Don't let nex be bigger than the number of extents
+ * we can have assuming alternating holes and real extents.
+ */
+ if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
+ nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
+
+ bmapi_flags = xfs_bmapi_aflag(whichfork);
+ if (!(iflags & BMV_IF_PREALLOC))
+ bmapi_flags |= XFS_BMAPI_IGSTATE;
+
+ /*
+ * Allocate enough space to handle "subnex" maps at a time.
+ */
+ error = ENOMEM;
+ subnex = 16;
+ map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
+ if (!map)
+ goto out_unlock_ilock;
+
+ bmv->bmv_entries = 0;
+
+ if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
+ (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
+ error = 0;
+ goto out_free_map;
+ }
+
+ nexleft = nex;
+
+ do {
+ nmap = (nexleft > subnex) ? subnex : nexleft;
+ error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
+ XFS_BB_TO_FSB(mp, bmv->bmv_length),
+ map, &nmap, bmapi_flags);
+ if (error)
+ goto out_free_map;
+ ASSERT(nmap <= subnex);
+
+ for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
+ out[cur_ext].bmv_oflags = 0;
+ if (map[i].br_state == XFS_EXT_UNWRITTEN)
+ out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
+ else if (map[i].br_startblock == DELAYSTARTBLOCK)
+ out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
+ out[cur_ext].bmv_offset =
+ XFS_FSB_TO_BB(mp, map[i].br_startoff);
+ out[cur_ext].bmv_length =
+ XFS_FSB_TO_BB(mp, map[i].br_blockcount);
+ out[cur_ext].bmv_unused1 = 0;
+ out[cur_ext].bmv_unused2 = 0;
+ ASSERT(((iflags & BMV_IF_DELALLOC) != 0) ||
+ (map[i].br_startblock != DELAYSTARTBLOCK));
+ if (map[i].br_startblock == HOLESTARTBLOCK &&
+ whichfork == XFS_ATTR_FORK) {
+ /* came to the end of attribute fork */
+ out[cur_ext].bmv_oflags |= BMV_OF_LAST;
+ goto out_free_map;
+ }
+
+ if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
+ prealloced, bmvend,
+ map[i].br_startblock))
+ goto out_free_map;
+
+ bmv->bmv_offset =
+ out[cur_ext].bmv_offset +
+ out[cur_ext].bmv_length;
+ bmv->bmv_length =
+ max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
+
+ /*
+ * In case we don't want to return the hole,
+ * don't increase cur_ext so that we can reuse
+ * it in the next loop.
+ */
+ if ((iflags & BMV_IF_NO_HOLES) &&
+ map[i].br_startblock == HOLESTARTBLOCK) {
+ memset(&out[cur_ext], 0, sizeof(out[cur_ext]));
+ continue;
+ }
+
+ nexleft--;
+ bmv->bmv_entries++;
+ cur_ext++;
+ }
+ } while (nmap && nexleft && bmv->bmv_length);
+
+ out_free_map:
+ kmem_free(map);
+ out_unlock_ilock:
+ xfs_iunlock_map_shared(ip, lock);
+ out_unlock_iolock:
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+
+ for (i = 0; i < cur_ext; i++) {
+ int full = 0; /* user array is full */
+
+ /* format results & advance arg */
+ error = formatter(&arg, &out[i], &full);
+ if (error || full)
+ break;
+ }
+
+ if (is_vmalloc_addr(out))
+ kmem_free_large(out);
+ else
+ kmem_free(out);
+ return error;
+}
+
+#ifdef DEBUG
+STATIC struct xfs_buf *
+xfs_bmap_get_bp(
+ struct xfs_btree_cur *cur,
+ xfs_fsblock_t bno)
+{
+ struct xfs_log_item_desc *lidp;
+ int i;
+
+ if (!cur)
+ return NULL;
+
+ for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
+ if (!cur->bc_bufs[i])
+ break;
+ if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
+ return cur->bc_bufs[i];
+ }
+
+ /* Chase down all the log items to see if the bp is there */
+ list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
+ struct xfs_buf_log_item *bip;
+ bip = (struct xfs_buf_log_item *)lidp->lid_item;
+ if (bip->bli_item.li_type == XFS_LI_BUF &&
+ XFS_BUF_ADDR(bip->bli_buf) == bno)
+ return bip->bli_buf;
+ }
+
+ return NULL;
+}
+
+STATIC void
+xfs_check_block(
+ struct xfs_btree_block *block,
+ xfs_mount_t *mp,
+ int root,
+ short sz)
+{
+ int i, j, dmxr;
+ __be64 *pp, *thispa; /* pointer to block address */
+ xfs_bmbt_key_t *prevp, *keyp;
+
+ ASSERT(be16_to_cpu(block->bb_level) > 0);
+
+ prevp = NULL;
+ for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
+ dmxr = mp->m_bmap_dmxr[0];
+ keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
+
+ if (prevp) {
+ ASSERT(be64_to_cpu(prevp->br_startoff) <
+ be64_to_cpu(keyp->br_startoff));
+ }
+ prevp = keyp;
+
+ /*
+ * Compare the block numbers to see if there are dups.
+ */
+ if (root)
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
+ else
+ pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
+
+ for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
+ if (root)
+ thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
+ else
+ thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
+ if (*thispa == *pp) {
+ xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
+ __func__, j, i,
+ (unsigned long long)be64_to_cpu(*thispa));
+ panic("%s: ptrs are equal in node\n",
+ __func__);
+ }
+ }
+ }
+}
+
+/*
+ * Check that the extents for the inode ip are in the right order in all
+ * btree leaves.
+ */
+
+STATIC void
+xfs_bmap_check_leaf_extents(
+ xfs_btree_cur_t *cur, /* btree cursor or null */
+ xfs_inode_t *ip, /* incore inode pointer */
+ int whichfork) /* data or attr fork */
+{
+ struct xfs_btree_block *block; /* current btree block */
+ xfs_fsblock_t bno; /* block # of "block" */
+ xfs_buf_t *bp; /* buffer for "block" */
+ int error; /* error return value */
+ xfs_extnum_t i=0, j; /* index into the extents list */
+ xfs_ifork_t *ifp; /* fork structure */
+ int level; /* btree level, for checking */
+ xfs_mount_t *mp; /* file system mount structure */
+ __be64 *pp; /* pointer to block address */
+ xfs_bmbt_rec_t *ep; /* pointer to current extent */
+ xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
+ xfs_bmbt_rec_t *nextp; /* pointer to next extent */
+ int bp_release = 0;
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
+ return;
+ }
+
+ bno = NULLFSBLOCK;
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ block = ifp->if_broot;
+ /*
+ * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+ */
+ level = be16_to_cpu(block->bb_level);
+ ASSERT(level > 0);
+ xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
+ bno = be64_to_cpu(*pp);
+
+ ASSERT(bno != NULLDFSBNO);
+ ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
+ ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
+
+ /*
+ * Go down the tree until leaf level is reached, following the first
+ * pointer (leftmost) at each level.
+ */
+ while (level-- > 0) {
+ /* See if buf is in cur first */
+ bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+ if (bp) {
+ bp_release = 0;
+ } else {
+ bp_release = 1;
+ }
+ if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ goto error_norelse;
+ block = XFS_BUF_TO_BLOCK(bp);
+ XFS_WANT_CORRUPTED_GOTO(
+ xfs_bmap_sanity_check(mp, bp, level),
+ error0);
+ if (level == 0)
+ break;
+
+ /*
+ * Check this block for basic sanity (increasing keys and
+ * no duplicate blocks).
+ */
+
+ xfs_check_block(block, mp, 0, 0);
+ pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
+ bno = be64_to_cpu(*pp);
+ XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, bno), error0);
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ }
+
+ /*
+ * Here with bp and block set to the leftmost leaf node in the tree.
+ */
+ i = 0;
+
+ /*
+ * Loop over all leaf nodes checking that all extents are in the right order.
+ */
+ for (;;) {
+ xfs_fsblock_t nextbno;
+ xfs_extnum_t num_recs;
+
+
+ num_recs = xfs_btree_get_numrecs(block);
+
+ /*
+ * Read-ahead the next leaf block, if any.
+ */
+
+ nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
+
+ /*
+ * Check all the extents to make sure they are OK.
+ * If we had a previous block, the last entry should
+ * conform with the first entry in this one.
+ */
+
+ ep = XFS_BMBT_REC_ADDR(mp, block, 1);
+ if (i) {
+ ASSERT(xfs_bmbt_disk_get_startoff(&last) +
+ xfs_bmbt_disk_get_blockcount(&last) <=
+ xfs_bmbt_disk_get_startoff(ep));
+ }
+ for (j = 1; j < num_recs; j++) {
+ nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
+ ASSERT(xfs_bmbt_disk_get_startoff(ep) +
+ xfs_bmbt_disk_get_blockcount(ep) <=
+ xfs_bmbt_disk_get_startoff(nextp));
+ ep = nextp;
+ }
+
+ last = *ep;
+ i += num_recs;
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ bno = nextbno;
+ /*
+ * If we've reached the end, stop.
+ */
+ if (bno == NULLFSBLOCK)
+ break;
+
+ bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+ if (bp) {
+ bp_release = 0;
+ } else {
+ bp_release = 1;
+ }
+ if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ goto error_norelse;
+ block = XFS_BUF_TO_BLOCK(bp);
+ }
+ if (bp_release) {
+ bp_release = 0;
+ xfs_trans_brelse(NULL, bp);
+ }
+ return;
+
+error0:
+ xfs_warn(mp, "%s: at error0", __func__);
+ if (bp_release)
+ xfs_trans_brelse(NULL, bp);
+error_norelse:
+ xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
+ __func__, i);
+ panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
+ return;
+}
+#endif
+
+/*
+ * Count fsblocks of the given fork.
+ */
+int /* error */
+xfs_bmap_count_blocks(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *ip, /* incore inode */
+ int whichfork, /* data or attr fork */
+ int *count) /* out: count of blocks */
+{
+ struct xfs_btree_block *block; /* current btree block */
+ xfs_fsblock_t bno; /* block # of "block" */
+ xfs_ifork_t *ifp; /* fork structure */
+ int level; /* btree level, for checking */
+ xfs_mount_t *mp; /* file system mount structure */
+ __be64 *pp; /* pointer to block address */
+
+ bno = NULLFSBLOCK;
+ mp = ip->i_mount;
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
+ xfs_bmap_count_leaves(ifp, 0,
+ ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
+ count);
+ return 0;
+ }
+
+ /*
+ * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+ */
+ block = ifp->if_broot;
+ level = be16_to_cpu(block->bb_level);
+ ASSERT(level > 0);
+ pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
+ bno = be64_to_cpu(*pp);
+ ASSERT(bno != NULLDFSBNO);
+ ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
+ ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
+
+ if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
+ XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
+ mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ return 0;
+}
+
+/*
+ * Recursively walks each level of a btree
+ * to count total fsblocks is use.
+ */
+STATIC int /* error */
+xfs_bmap_count_tree(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_ifork_t *ifp, /* inode fork pointer */
+ xfs_fsblock_t blockno, /* file system block number */
+ int levelin, /* level in btree */
+ int *count) /* Count of blocks */
+{
+ int error;
+ xfs_buf_t *bp, *nbp;
+ int level = levelin;
+ __be64 *pp;
+ xfs_fsblock_t bno = blockno;
+ xfs_fsblock_t nextbno;
+ struct xfs_btree_block *block, *nextblock;
+ int numrecs;
+
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
+ return error;
+ *count += 1;
+ block = XFS_BUF_TO_BLOCK(bp);
+
+ if (--level) {
+ /* Not at node above leaves, count this level of nodes */
+ nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
+ while (nextbno != NULLFSBLOCK) {
+ if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
+ 0, &nbp, XFS_BMAP_BTREE_REF)))
+ return error;
+ *count += 1;
+ nextblock = XFS_BUF_TO_BLOCK(nbp);
+ nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
+ xfs_trans_brelse(tp, nbp);
+ }
+
+ /* Dive to the next level */
+ pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
+ bno = be64_to_cpu(*pp);
+ if (unlikely((error =
+ xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
+ xfs_trans_brelse(tp, bp);
+ XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ xfs_trans_brelse(tp, bp);
+ } else {
+ /* count all level 1 nodes and their leaves */
+ for (;;) {
+ nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
+ numrecs = be16_to_cpu(block->bb_numrecs);
+ xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
+ xfs_trans_brelse(tp, bp);
+ if (nextbno == NULLFSBLOCK)
+ break;
+ bno = nextbno;
+ if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+ XFS_BMAP_BTREE_REF)))
+ return error;
+ *count += 1;
+ block = XFS_BUF_TO_BLOCK(bp);
+ }
+ }
+ return 0;
+}
+
+/*
+ * Count leaf blocks given a range of extent records.
+ */
+STATIC void
+xfs_bmap_count_leaves(
+ xfs_ifork_t *ifp,
+ xfs_extnum_t idx,
+ int numrecs,
+ int *count)
+{
+ int b;
+
+ for (b = 0; b < numrecs; b++) {
+ xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
+ *count += xfs_bmbt_get_blockcount(frp);
+ }
+}
+
+/*
+ * Count leaf blocks given a range of extent records originally
+ * in btree format.
+ */
+STATIC void
+xfs_bmap_disk_count_leaves(
+ struct xfs_mount *mp,
+ struct xfs_btree_block *block,
+ int numrecs,
+ int *count)
+{
+ int b;
+ xfs_bmbt_rec_t *frp;
+
+ for (b = 1; b <= numrecs; b++) {
+ frp = XFS_BMBT_REC_ADDR(mp, block, b);
+ *count += xfs_bmbt_disk_get_blockcount(frp);
+ }
+}
+
+/*
+ * dead simple method of punching delalyed allocation blocks from a range in
+ * the inode. Walks a block at a time so will be slow, but is only executed in
+ * rare error cases so the overhead is not critical. This will alays punch out
+ * both the start and end blocks, even if the ranges only partially overlap
+ * them, so it is up to the caller to ensure that partial blocks are not
+ * passed in.
+ */
+int
+xfs_bmap_punch_delalloc_range(
+ struct xfs_inode *ip,
+ xfs_fileoff_t start_fsb,
+ xfs_fileoff_t length)
+{
+ xfs_fileoff_t remaining = length;
+ int error = 0;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+ do {
+ int done;
+ xfs_bmbt_irec_t imap;
+ int nimaps = 1;
+ xfs_fsblock_t firstblock;
+ xfs_bmap_free_t flist;
+
+ /*
+ * Map the range first and check that it is a delalloc extent
+ * before trying to unmap the range. Otherwise we will be
+ * trying to remove a real extent (which requires a
+ * transaction) or a hole, which is probably a bad idea...
+ */
+ error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps,
+ XFS_BMAPI_ENTIRE);
+
+ if (error) {
+ /* something screwed, just bail */
+ if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
+ xfs_alert(ip->i_mount,
+ "Failed delalloc mapping lookup ino %lld fsb %lld.",
+ ip->i_ino, start_fsb);
+ }
+ break;
+ }
+ if (!nimaps) {
+ /* nothing there */
+ goto next_block;
+ }
+ if (imap.br_startblock != DELAYSTARTBLOCK) {
+ /* been converted, ignore */
+ goto next_block;
+ }
+ WARN_ON(imap.br_blockcount == 0);
+
+ /*
+ * Note: while we initialise the firstblock/flist pair, they
+ * should never be used because blocks should never be
+ * allocated or freed for a delalloc extent and hence we need
+ * don't cancel or finish them after the xfs_bunmapi() call.
+ */
+ xfs_bmap_init(&flist, &firstblock);
+ error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
+ &flist, &done);
+ if (error)
+ break;
+
+ ASSERT(!flist.xbf_count && !flist.xbf_first);
+next_block:
+ start_fsb++;
+ remaining--;
+ } while(remaining > 0);
+
+ return error;
+}