zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/xfs/xfs_dir2.c b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_dir2.c
new file mode 100644
index 0000000..a2e2701
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_dir2.c
@@ -0,0 +1,666 @@
+/*
+ * Copyright (c) 2000-2001,2005 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_mount.h"
+#include "xfs_da_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
+#include "xfs_dir2.h"
+#include "xfs_dir2_format.h"
+#include "xfs_dir2_priv.h"
+#include "xfs_error.h"
+#include "xfs_vnodeops.h"
+#include "xfs_trace.h"
+
+struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
+
+/*
+ * ASCII case-insensitive (ie. A-Z) support for directories that was
+ * used in IRIX.
+ */
+STATIC xfs_dahash_t
+xfs_ascii_ci_hashname(
+ struct xfs_name *name)
+{
+ xfs_dahash_t hash;
+ int i;
+
+ for (i = 0, hash = 0; i < name->len; i++)
+ hash = tolower(name->name[i]) ^ rol32(hash, 7);
+
+ return hash;
+}
+
+STATIC enum xfs_dacmp
+xfs_ascii_ci_compname(
+ struct xfs_da_args *args,
+ const unsigned char *name,
+ int len)
+{
+ enum xfs_dacmp result;
+ int i;
+
+ if (args->namelen != len)
+ return XFS_CMP_DIFFERENT;
+
+ result = XFS_CMP_EXACT;
+ for (i = 0; i < len; i++) {
+ if (args->name[i] == name[i])
+ continue;
+ if (tolower(args->name[i]) != tolower(name[i]))
+ return XFS_CMP_DIFFERENT;
+ result = XFS_CMP_CASE;
+ }
+
+ return result;
+}
+
+static struct xfs_nameops xfs_ascii_ci_nameops = {
+ .hashname = xfs_ascii_ci_hashname,
+ .compname = xfs_ascii_ci_compname,
+};
+
+void
+xfs_dir_mount(
+ xfs_mount_t *mp)
+{
+ ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
+ ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
+ XFS_MAX_BLOCKSIZE);
+ mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
+ mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
+ mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
+ mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
+ mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
+ mp->m_attr_node_ents =
+ (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
+ (uint)sizeof(xfs_da_node_entry_t);
+ mp->m_dir_node_ents =
+ (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
+ (uint)sizeof(xfs_da_node_entry_t);
+ mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
+ if (xfs_sb_version_hasasciici(&mp->m_sb))
+ mp->m_dirnameops = &xfs_ascii_ci_nameops;
+ else
+ mp->m_dirnameops = &xfs_default_nameops;
+}
+
+/*
+ * Return 1 if directory contains only "." and "..".
+ */
+int
+xfs_dir_isempty(
+ xfs_inode_t *dp)
+{
+ xfs_dir2_sf_hdr_t *sfp;
+
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+ if (dp->i_d.di_size == 0) /* might happen during shutdown. */
+ return 1;
+ if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
+ return 0;
+ sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
+ return !sfp->count;
+}
+
+/*
+ * Validate a given inode number.
+ */
+int
+xfs_dir_ino_validate(
+ xfs_mount_t *mp,
+ xfs_ino_t ino)
+{
+ xfs_agblock_t agblkno;
+ xfs_agino_t agino;
+ xfs_agnumber_t agno;
+ int ino_ok;
+ int ioff;
+
+ agno = XFS_INO_TO_AGNO(mp, ino);
+ agblkno = XFS_INO_TO_AGBNO(mp, ino);
+ ioff = XFS_INO_TO_OFFSET(mp, ino);
+ agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
+ ino_ok =
+ agno < mp->m_sb.sb_agcount &&
+ agblkno < mp->m_sb.sb_agblocks &&
+ agblkno != 0 &&
+ ioff < (1 << mp->m_sb.sb_inopblog) &&
+ XFS_AGINO_TO_INO(mp, agno, agino) == ino;
+ if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
+ XFS_RANDOM_DIR_INO_VALIDATE))) {
+ xfs_warn(mp, "Invalid inode number 0x%Lx",
+ (unsigned long long) ino);
+ XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ return 0;
+}
+
+/*
+ * Initialize a directory with its "." and ".." entries.
+ */
+int
+xfs_dir_init(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ xfs_inode_t *pdp)
+{
+ xfs_da_args_t args;
+ int error;
+
+ memset((char *)&args, 0, sizeof(args));
+ args.dp = dp;
+ args.trans = tp;
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+ if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
+ return error;
+ return xfs_dir2_sf_create(&args, pdp->i_ino);
+}
+
+/*
+ Enter a name in a directory.
+ */
+int
+xfs_dir_createname(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_ino_t inum, /* new entry inode number */
+ xfs_fsblock_t *first, /* bmap's firstblock */
+ xfs_bmap_free_t *flist, /* bmap's freeblock list */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ xfs_da_args_t args;
+ int rval;
+ int v; /* type-checking value */
+
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+ if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
+ return rval;
+ XFS_STATS_INC(xs_dir_create);
+
+ memset(&args, 0, sizeof(xfs_da_args_t));
+ args.name = name->name;
+ args.namelen = name->len;
+ args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args.inumber = inum;
+ args.dp = dp;
+ args.firstblock = first;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+ args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ rval = xfs_dir2_sf_addname(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_block_addname(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_leaf_addname(&args);
+ else
+ rval = xfs_dir2_node_addname(&args);
+ return rval;
+}
+
+/*
+ * If doing a CI lookup and case-insensitive match, dup actual name into
+ * args.value. Return EEXIST for success (ie. name found) or an error.
+ */
+int
+xfs_dir_cilookup_result(
+ struct xfs_da_args *args,
+ const unsigned char *name,
+ int len)
+{
+ if (args->cmpresult == XFS_CMP_DIFFERENT)
+ return ENOENT;
+ if (args->cmpresult != XFS_CMP_CASE ||
+ !(args->op_flags & XFS_DA_OP_CILOOKUP))
+ return EEXIST;
+
+ args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
+ if (!args->value)
+ return ENOMEM;
+
+ memcpy(args->value, name, len);
+ args->valuelen = len;
+ return EEXIST;
+}
+
+/*
+ * Lookup a name in a directory, give back the inode number.
+ * If ci_name is not NULL, returns the actual name in ci_name if it differs
+ * to name, or ci_name->name is set to NULL for an exact match.
+ */
+
+int
+xfs_dir_lookup(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_ino_t *inum, /* out: inode number */
+ struct xfs_name *ci_name) /* out: actual name if CI match */
+{
+ xfs_da_args_t args;
+ int rval;
+ int v; /* type-checking value */
+
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+ XFS_STATS_INC(xs_dir_lookup);
+
+ memset(&args, 0, sizeof(xfs_da_args_t));
+ args.name = name->name;
+ args.namelen = name->len;
+ args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args.dp = dp;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+ args.op_flags = XFS_DA_OP_OKNOENT;
+ if (ci_name)
+ args.op_flags |= XFS_DA_OP_CILOOKUP;
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ rval = xfs_dir2_sf_lookup(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_block_lookup(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_leaf_lookup(&args);
+ else
+ rval = xfs_dir2_node_lookup(&args);
+ if (rval == EEXIST)
+ rval = 0;
+ if (!rval) {
+ *inum = args.inumber;
+ if (ci_name) {
+ ci_name->name = args.value;
+ ci_name->len = args.valuelen;
+ }
+ }
+ return rval;
+}
+
+/*
+ * Remove an entry from a directory.
+ */
+int
+xfs_dir_removename(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_ino_t ino,
+ xfs_fsblock_t *first, /* bmap's firstblock */
+ xfs_bmap_free_t *flist, /* bmap's freeblock list */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ xfs_da_args_t args;
+ int rval;
+ int v; /* type-checking value */
+
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+ XFS_STATS_INC(xs_dir_remove);
+
+ memset(&args, 0, sizeof(xfs_da_args_t));
+ args.name = name->name;
+ args.namelen = name->len;
+ args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args.inumber = ino;
+ args.dp = dp;
+ args.firstblock = first;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ rval = xfs_dir2_sf_removename(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_block_removename(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_leaf_removename(&args);
+ else
+ rval = xfs_dir2_node_removename(&args);
+ return rval;
+}
+
+/*
+ * Read a directory.
+ */
+int
+xfs_readdir(
+ xfs_inode_t *dp,
+ void *dirent,
+ size_t bufsize,
+ xfs_off_t *offset,
+ filldir_t filldir)
+{
+ int rval; /* return value */
+ int v; /* type-checking value */
+
+ trace_xfs_readdir(dp);
+
+ if (XFS_FORCED_SHUTDOWN(dp->i_mount))
+ return XFS_ERROR(EIO);
+
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+ XFS_STATS_INC(xs_dir_getdents);
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
+ else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
+ ;
+ else if (v)
+ rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
+ else
+ rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
+ filldir);
+ return rval;
+}
+
+/*
+ * Replace the inode number of a directory entry.
+ */
+int
+xfs_dir_replace(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ struct xfs_name *name, /* name of entry to replace */
+ xfs_ino_t inum, /* new inode number */
+ xfs_fsblock_t *first, /* bmap's firstblock */
+ xfs_bmap_free_t *flist, /* bmap's freeblock list */
+ xfs_extlen_t total) /* bmap's total block count */
+{
+ xfs_da_args_t args;
+ int rval;
+ int v; /* type-checking value */
+
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+
+ if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
+ return rval;
+
+ memset(&args, 0, sizeof(xfs_da_args_t));
+ args.name = name->name;
+ args.namelen = name->len;
+ args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args.inumber = inum;
+ args.dp = dp;
+ args.firstblock = first;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ rval = xfs_dir2_sf_replace(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_block_replace(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_leaf_replace(&args);
+ else
+ rval = xfs_dir2_node_replace(&args);
+ return rval;
+}
+
+/*
+ * See if this entry can be added to the directory without allocating space.
+ * First checks that the caller couldn't reserve enough space (resblks = 0).
+ */
+int
+xfs_dir_canenter(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ struct xfs_name *name, /* name of entry to add */
+ uint resblks)
+{
+ xfs_da_args_t args;
+ int rval;
+ int v; /* type-checking value */
+
+ if (resblks)
+ return 0;
+
+ ASSERT(S_ISDIR(dp->i_d.di_mode));
+
+ memset(&args, 0, sizeof(xfs_da_args_t));
+ args.name = name->name;
+ args.namelen = name->len;
+ args.hashval = dp->i_mount->m_dirnameops->hashname(name);
+ args.dp = dp;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = tp;
+ args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
+ XFS_DA_OP_OKNOENT;
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ rval = xfs_dir2_sf_addname(&args);
+ else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_block_addname(&args);
+ else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
+ return rval;
+ else if (v)
+ rval = xfs_dir2_leaf_addname(&args);
+ else
+ rval = xfs_dir2_node_addname(&args);
+ return rval;
+}
+
+/*
+ * Utility routines.
+ */
+
+/*
+ * Add a block to the directory.
+ *
+ * This routine is for data and free blocks, not leaf/node blocks which are
+ * handled by xfs_da_grow_inode.
+ */
+int
+xfs_dir2_grow_inode(
+ struct xfs_da_args *args,
+ int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
+ xfs_dir2_db_t *dbp) /* out: block number added */
+{
+ struct xfs_inode *dp = args->dp;
+ struct xfs_mount *mp = dp->i_mount;
+ xfs_fileoff_t bno; /* directory offset of new block */
+ int count; /* count of filesystem blocks */
+ int error;
+
+ trace_xfs_dir2_grow_inode(args, space);
+
+ /*
+ * Set lowest possible block in the space requested.
+ */
+ bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
+ count = mp->m_dirblkfsbs;
+
+ error = xfs_da_grow_inode_int(args, &bno, count);
+ if (error)
+ return error;
+
+ *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
+
+ /*
+ * Update file's size if this is the data space and it grew.
+ */
+ if (space == XFS_DIR2_DATA_SPACE) {
+ xfs_fsize_t size; /* directory file (data) size */
+
+ size = XFS_FSB_TO_B(mp, bno + count);
+ if (size > dp->i_d.di_size) {
+ dp->i_d.di_size = size;
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
+ }
+ }
+ return 0;
+}
+
+/*
+ * See if the directory is a single-block form directory.
+ */
+int
+xfs_dir2_isblock(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ int *vp) /* out: 1 is block, 0 is not block */
+{
+ xfs_fileoff_t last; /* last file offset */
+ xfs_mount_t *mp;
+ int rval;
+
+ mp = dp->i_mount;
+ if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
+ return rval;
+ rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
+ ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
+ *vp = rval;
+ return 0;
+}
+
+/*
+ * See if the directory is a single-leaf form directory.
+ */
+int
+xfs_dir2_isleaf(
+ xfs_trans_t *tp,
+ xfs_inode_t *dp,
+ int *vp) /* out: 1 is leaf, 0 is not leaf */
+{
+ xfs_fileoff_t last; /* last file offset */
+ xfs_mount_t *mp;
+ int rval;
+
+ mp = dp->i_mount;
+ if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
+ return rval;
+ *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
+ return 0;
+}
+
+/*
+ * Remove the given block from the directory.
+ * This routine is used for data and free blocks, leaf/node are done
+ * by xfs_da_shrink_inode.
+ */
+int
+xfs_dir2_shrink_inode(
+ xfs_da_args_t *args,
+ xfs_dir2_db_t db,
+ xfs_dabuf_t *bp)
+{
+ xfs_fileoff_t bno; /* directory file offset */
+ xfs_dablk_t da; /* directory file offset */
+ int done; /* bunmap is finished */
+ xfs_inode_t *dp;
+ int error;
+ xfs_mount_t *mp;
+ xfs_trans_t *tp;
+
+ trace_xfs_dir2_shrink_inode(args, db);
+
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ da = xfs_dir2_db_to_da(mp, db);
+ /*
+ * Unmap the fsblock(s).
+ */
+ if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
+ XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
+ &done))) {
+ /*
+ * ENOSPC actually can happen if we're in a removename with
+ * no space reservation, and the resulting block removal
+ * would cause a bmap btree split or conversion from extents
+ * to btree. This can only happen for un-fragmented
+ * directory blocks, since you need to be punching out
+ * the middle of an extent.
+ * In this case we need to leave the block in the file,
+ * and not binval it.
+ * So the block has to be in a consistent empty state
+ * and appropriately logged.
+ * We don't free up the buffer, the caller can tell it
+ * hasn't happened since it got an error back.
+ */
+ return error;
+ }
+ ASSERT(done);
+ /*
+ * Invalidate the buffer from the transaction.
+ */
+ xfs_da_binval(tp, bp);
+ /*
+ * If it's not a data block, we're done.
+ */
+ if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
+ return 0;
+ /*
+ * If the block isn't the last one in the directory, we're done.
+ */
+ if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
+ return 0;
+ bno = da;
+ if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
+ /*
+ * This can't really happen unless there's kernel corruption.
+ */
+ return error;
+ }
+ if (db == mp->m_dirdatablk)
+ ASSERT(bno == 0);
+ else
+ ASSERT(bno > 0);
+ /*
+ * Set the size to the new last block.
+ */
+ dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ return 0;
+}