zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/xfs/xfs_vnodeops.c b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_vnodeops.c
new file mode 100644
index 0000000..64981d7
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_vnodeops.c
@@ -0,0 +1,2380 @@
+/*
+ * 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_mount.h"
+#include "xfs_da_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_inode_item.h"
+#include "xfs_itable.h"
+#include "xfs_ialloc.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_acl.h"
+#include "xfs_attr.h"
+#include "xfs_rw.h"
+#include "xfs_error.h"
+#include "xfs_quota.h"
+#include "xfs_utils.h"
+#include "xfs_rtalloc.h"
+#include "xfs_trans_space.h"
+#include "xfs_log_priv.h"
+#include "xfs_filestream.h"
+#include "xfs_vnodeops.h"
+#include "xfs_trace.h"
+
+/*
+ * The maximum pathlen is 1024 bytes. Since the minimum file system
+ * blocksize is 512 bytes, we can get a max of 2 extents back from
+ * bmapi.
+ */
+#define SYMLINK_MAPS 2
+
+STATIC int
+xfs_readlink_bmap(
+ xfs_inode_t *ip,
+ char *link)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ int pathlen = ip->i_d.di_size;
+ int nmaps = SYMLINK_MAPS;
+ xfs_bmbt_irec_t mval[SYMLINK_MAPS];
+ xfs_daddr_t d;
+ int byte_cnt;
+ int n;
+ xfs_buf_t *bp;
+ int error = 0;
+
+ error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
+ 0);
+ if (error)
+ goto out;
+
+ for (n = 0; n < nmaps; n++) {
+ d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
+ byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
+
+ bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt),
+ XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK);
+ if (!bp)
+ return XFS_ERROR(ENOMEM);
+ error = bp->b_error;
+ if (error) {
+ xfs_buf_ioerror_alert(bp, __func__);
+ xfs_buf_relse(bp);
+ goto out;
+ }
+ if (pathlen < byte_cnt)
+ byte_cnt = pathlen;
+ pathlen -= byte_cnt;
+
+ memcpy(link, bp->b_addr, byte_cnt);
+ xfs_buf_relse(bp);
+ }
+
+ link[ip->i_d.di_size] = '\0';
+ error = 0;
+
+ out:
+ return error;
+}
+
+int
+xfs_readlink(
+ xfs_inode_t *ip,
+ char *link)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_fsize_t pathlen;
+ int error = 0;
+
+ trace_xfs_readlink(ip);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ xfs_ilock(ip, XFS_ILOCK_SHARED);
+
+ pathlen = ip->i_d.di_size;
+ if (!pathlen)
+ goto out;
+
+ if (pathlen < 0 || pathlen > MAXPATHLEN) {
+ xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
+ __func__, (unsigned long long) ip->i_ino,
+ (long long) pathlen);
+ ASSERT(0);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto out;
+ }
+
+
+ if (ip->i_df.if_flags & XFS_IFINLINE) {
+ memcpy(link, ip->i_df.if_u1.if_data, pathlen);
+ link[pathlen] = '\0';
+ } else {
+ error = xfs_readlink_bmap(ip, link);
+ }
+
+ out:
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ return error;
+}
+
+/*
+ * Flags for xfs_free_eofblocks
+ */
+#define XFS_FREE_EOF_TRYLOCK (1<<0)
+
+/*
+ * This is called by xfs_inactive to free any blocks beyond eof
+ * when the link count isn't zero and by xfs_dm_punch_hole() when
+ * punching a hole to EOF.
+ */
+STATIC int
+xfs_free_eofblocks(
+ xfs_mount_t *mp,
+ xfs_inode_t *ip,
+ int flags)
+{
+ xfs_trans_t *tp;
+ int error;
+ xfs_fileoff_t end_fsb;
+ xfs_fileoff_t last_fsb;
+ xfs_filblks_t map_len;
+ int nimaps;
+ xfs_bmbt_irec_t imap;
+
+ /*
+ * Figure out if there are any blocks beyond the end
+ * of the file. If not, then there is nothing to do.
+ */
+ end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
+ last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
+ if (last_fsb <= end_fsb)
+ return 0;
+ map_len = last_fsb - end_fsb;
+
+ nimaps = 1;
+ xfs_ilock(ip, XFS_ILOCK_SHARED);
+ error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+
+ if (!error && (nimaps != 0) &&
+ (imap.br_startblock != HOLESTARTBLOCK ||
+ ip->i_delayed_blks)) {
+ /*
+ * Attach the dquots to the inode up front.
+ */
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return error;
+
+ /*
+ * There are blocks after the end of file.
+ * Free them up now by truncating the file to
+ * its current size.
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+
+ if (flags & XFS_FREE_EOF_TRYLOCK) {
+ if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
+ xfs_trans_cancel(tp, 0);
+ return 0;
+ }
+ } else {
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+ }
+
+ error = xfs_trans_reserve(tp, 0,
+ XFS_ITRUNCATE_LOG_RES(mp),
+ 0, XFS_TRANS_PERM_LOG_RES,
+ XFS_ITRUNCATE_LOG_COUNT);
+ if (error) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return error;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ /*
+ * Do not update the on-disk file size. If we update the
+ * on-disk file size and then the system crashes before the
+ * contents of the file are flushed to disk then the files
+ * may be full of holes (ie NULL files bug).
+ */
+ error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
+ XFS_ISIZE(ip));
+ if (error) {
+ /*
+ * If we get an error at this point we simply don't
+ * bother truncating the file.
+ */
+ xfs_trans_cancel(tp,
+ (XFS_TRANS_RELEASE_LOG_RES |
+ XFS_TRANS_ABORT));
+ } else {
+ error = xfs_trans_commit(tp,
+ XFS_TRANS_RELEASE_LOG_RES);
+ }
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL);
+ }
+ return error;
+}
+
+/*
+ * Free a symlink that has blocks associated with it.
+ */
+STATIC int
+xfs_inactive_symlink_rmt(
+ xfs_inode_t *ip,
+ xfs_trans_t **tpp)
+{
+ xfs_buf_t *bp;
+ int committed;
+ int done;
+ int error;
+ xfs_fsblock_t first_block;
+ xfs_bmap_free_t free_list;
+ int i;
+ xfs_mount_t *mp;
+ xfs_bmbt_irec_t mval[SYMLINK_MAPS];
+ int nmaps;
+ xfs_trans_t *ntp;
+ int size;
+ xfs_trans_t *tp;
+
+ tp = *tpp;
+ mp = ip->i_mount;
+ ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
+ /*
+ * We're freeing a symlink that has some
+ * blocks allocated to it. Free the
+ * blocks here. We know that we've got
+ * either 1 or 2 extents and that we can
+ * free them all in one bunmapi call.
+ */
+ ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
+ if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ *tpp = NULL;
+ return error;
+ }
+ /*
+ * Lock the inode, fix the size, and join it to the transaction.
+ * Hold it so in the normal path, we still have it locked for
+ * the second transaction. In the error paths we need it
+ * held so the cancel won't rele it, see below.
+ */
+ xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ size = (int)ip->i_d.di_size;
+ ip->i_d.di_size = 0;
+ xfs_trans_ijoin(tp, ip, 0);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ /*
+ * Find the block(s) so we can inval and unmap them.
+ */
+ done = 0;
+ xfs_bmap_init(&free_list, &first_block);
+ nmaps = ARRAY_SIZE(mval);
+ error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
+ mval, &nmaps, 0);
+ if (error)
+ goto error0;
+ /*
+ * Invalidate the block(s).
+ */
+ for (i = 0; i < nmaps; i++) {
+ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
+ XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
+ if (!bp) {
+ error = ENOMEM;
+ goto error1;
+ }
+ xfs_trans_binval(tp, bp);
+ }
+ /*
+ * Unmap the dead block(s) to the free_list.
+ */
+ if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
+ &first_block, &free_list, &done)))
+ goto error1;
+ ASSERT(done);
+ /*
+ * Commit the first transaction. This logs the EFI and the inode.
+ */
+ if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
+ goto error1;
+ /*
+ * The transaction must have been committed, since there were
+ * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
+ * The new tp has the extent freeing and EFDs.
+ */
+ ASSERT(committed);
+ /*
+ * The first xact was committed, so add the inode to the new one.
+ * Mark it dirty so it will be logged and moved forward in the log as
+ * part of every commit.
+ */
+ xfs_trans_ijoin(tp, ip, 0);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ /*
+ * Get a new, empty transaction to return to our caller.
+ */
+ ntp = xfs_trans_dup(tp);
+ /*
+ * Commit the transaction containing extent freeing and EFDs.
+ * If we get an error on the commit here or on the reserve below,
+ * we need to unlock the inode since the new transaction doesn't
+ * have the inode attached.
+ */
+ error = xfs_trans_commit(tp, 0);
+ tp = ntp;
+ if (error) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ goto error0;
+ }
+ /*
+ * transaction commit worked ok so we can drop the extra ticket
+ * reference that we gained in xfs_trans_dup()
+ */
+ xfs_log_ticket_put(tp->t_ticket);
+
+ /*
+ * Remove the memory for extent descriptions (just bookkeeping).
+ */
+ if (ip->i_df.if_bytes)
+ xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
+ ASSERT(ip->i_df.if_bytes == 0);
+ /*
+ * Put an itruncate log reservation in the new transaction
+ * for our caller.
+ */
+ if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ goto error0;
+ }
+ /*
+ * Return with the inode locked but not joined to the transaction.
+ */
+ *tpp = tp;
+ return 0;
+
+ error1:
+ xfs_bmap_cancel(&free_list);
+ error0:
+ /*
+ * Have to come here with the inode locked and either
+ * (held and in the transaction) or (not in the transaction).
+ * If the inode isn't held then cancel would iput it, but
+ * that's wrong since this is inactive and the vnode ref
+ * count is 0 already.
+ * Cancel won't do anything to the inode if held, but it still
+ * needs to be locked until the cancel is done, if it was
+ * joined to the transaction.
+ */
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ *tpp = NULL;
+ return error;
+
+}
+
+STATIC int
+xfs_inactive_symlink_local(
+ xfs_inode_t *ip,
+ xfs_trans_t **tpp)
+{
+ int error;
+
+ ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
+ /*
+ * We're freeing a symlink which fit into
+ * the inode. Just free the memory used
+ * to hold the old symlink.
+ */
+ error = xfs_trans_reserve(*tpp, 0,
+ XFS_ITRUNCATE_LOG_RES(ip->i_mount),
+ 0, XFS_TRANS_PERM_LOG_RES,
+ XFS_ITRUNCATE_LOG_COUNT);
+
+ if (error) {
+ xfs_trans_cancel(*tpp, 0);
+ *tpp = NULL;
+ return error;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+
+ /*
+ * Zero length symlinks _can_ exist.
+ */
+ if (ip->i_df.if_bytes > 0) {
+ xfs_idata_realloc(ip,
+ -(ip->i_df.if_bytes),
+ XFS_DATA_FORK);
+ ASSERT(ip->i_df.if_bytes == 0);
+ }
+ return 0;
+}
+
+STATIC int
+xfs_inactive_attrs(
+ xfs_inode_t *ip,
+ xfs_trans_t **tpp)
+{
+ xfs_trans_t *tp;
+ int error;
+ xfs_mount_t *mp;
+
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
+ tp = *tpp;
+ mp = ip->i_mount;
+ ASSERT(ip->i_d.di_forkoff != 0);
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (error)
+ goto error_unlock;
+
+ error = xfs_attr_inactive(ip);
+ if (error)
+ goto error_unlock;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+ error = xfs_trans_reserve(tp, 0,
+ XFS_IFREE_LOG_RES(mp),
+ 0, XFS_TRANS_PERM_LOG_RES,
+ XFS_INACTIVE_LOG_COUNT);
+ if (error)
+ goto error_cancel;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+ xfs_idestroy_fork(ip, XFS_ATTR_FORK);
+
+ ASSERT(ip->i_d.di_anextents == 0);
+
+ *tpp = tp;
+ return 0;
+
+error_cancel:
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+error_unlock:
+ *tpp = NULL;
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return error;
+}
+
+int
+xfs_release(
+ xfs_inode_t *ip)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ int error;
+
+ if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
+ return 0;
+
+ /* If this is a read-only mount, don't do this (would generate I/O) */
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ return 0;
+
+ if (!XFS_FORCED_SHUTDOWN(mp)) {
+ int truncated;
+
+ /*
+ * If we are using filestreams, and we have an unlinked
+ * file that we are processing the last close on, then nothing
+ * will be able to reopen and write to this file. Purge this
+ * inode from the filestreams cache so that it doesn't delay
+ * teardown of the inode.
+ */
+ if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
+ xfs_filestream_deassociate(ip);
+
+ /*
+ * If we previously truncated this file and removed old data
+ * in the process, we want to initiate "early" writeout on
+ * the last close. This is an attempt to combat the notorious
+ * NULL files problem which is particularly noticeable from a
+ * truncate down, buffered (re-)write (delalloc), followed by
+ * a crash. What we are effectively doing here is
+ * significantly reducing the time window where we'd otherwise
+ * be exposed to that problem.
+ */
+ truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
+ if (truncated) {
+ xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
+ if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
+ xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
+ }
+ }
+
+ if (ip->i_d.di_nlink == 0)
+ return 0;
+
+ if ((S_ISREG(ip->i_d.di_mode) &&
+ (VFS_I(ip)->i_size > 0 ||
+ (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
+ (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
+ (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
+
+ /*
+ * If we can't get the iolock just skip truncating the blocks
+ * past EOF because we could deadlock with the mmap_sem
+ * otherwise. We'll get another chance to drop them once the
+ * last reference to the inode is dropped, so we'll never leak
+ * blocks permanently.
+ *
+ * Further, check if the inode is being opened, written and
+ * closed frequently and we have delayed allocation blocks
+ * outstanding (e.g. streaming writes from the NFS server),
+ * truncating the blocks past EOF will cause fragmentation to
+ * occur.
+ *
+ * In this case don't do the truncation, either, but we have to
+ * be careful how we detect this case. Blocks beyond EOF show
+ * up as i_delayed_blks even when the inode is clean, so we
+ * need to truncate them away first before checking for a dirty
+ * release. Hence on the first dirty close we will still remove
+ * the speculative allocation, but after that we will leave it
+ * in place.
+ */
+ if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
+ return 0;
+
+ error = xfs_free_eofblocks(mp, ip,
+ XFS_FREE_EOF_TRYLOCK);
+ if (error)
+ return error;
+
+ /* delalloc blocks after truncation means it really is dirty */
+ if (ip->i_delayed_blks)
+ xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
+ }
+ return 0;
+}
+
+/*
+ * xfs_inactive
+ *
+ * This is called when the vnode reference count for the vnode
+ * goes to zero. If the file has been unlinked, then it must
+ * now be truncated. Also, we clear all of the read-ahead state
+ * kept for the inode here since the file is now closed.
+ */
+int
+xfs_inactive(
+ xfs_inode_t *ip)
+{
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ int committed;
+ xfs_trans_t *tp;
+ xfs_mount_t *mp;
+ int error;
+ int truncate;
+
+ /*
+ * If the inode is already free, then there can be nothing
+ * to clean up here.
+ */
+ if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
+ ASSERT(ip->i_df.if_real_bytes == 0);
+ ASSERT(ip->i_df.if_broot_bytes == 0);
+ return VN_INACTIVE_CACHE;
+ }
+
+ /*
+ * Only do a truncate if it's a regular file with
+ * some actual space in it. It's OK to look at the
+ * inode's fields without the lock because we're the
+ * only one with a reference to the inode.
+ */
+ truncate = ((ip->i_d.di_nlink == 0) &&
+ ((ip->i_d.di_size != 0) || XFS_ISIZE(ip) != 0 ||
+ (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
+ S_ISREG(ip->i_d.di_mode));
+
+ mp = ip->i_mount;
+
+ error = 0;
+
+ /* If this is a read-only mount, don't do this (would generate I/O) */
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ goto out;
+
+ if (ip->i_d.di_nlink != 0) {
+ if ((S_ISREG(ip->i_d.di_mode) &&
+ (VFS_I(ip)->i_size > 0 ||
+ (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
+ (ip->i_df.if_flags & XFS_IFEXTENTS) &&
+ (!(ip->i_d.di_flags &
+ (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
+ ip->i_delayed_blks != 0))) {
+ error = xfs_free_eofblocks(mp, ip, 0);
+ if (error)
+ return VN_INACTIVE_CACHE;
+ }
+ goto out;
+ }
+
+ ASSERT(ip->i_d.di_nlink == 0);
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return VN_INACTIVE_CACHE;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+ if (truncate) {
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+
+ error = xfs_trans_reserve(tp, 0,
+ XFS_ITRUNCATE_LOG_RES(mp),
+ 0, XFS_TRANS_PERM_LOG_RES,
+ XFS_ITRUNCATE_LOG_COUNT);
+ if (error) {
+ /* Don't call itruncate_cleanup */
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return VN_INACTIVE_CACHE;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ ip->i_d.di_size = 0;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
+ if (error) {
+ xfs_trans_cancel(tp,
+ XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ return VN_INACTIVE_CACHE;
+ }
+
+ ASSERT(ip->i_d.di_nextents == 0);
+ } else if (S_ISLNK(ip->i_d.di_mode)) {
+
+ /*
+ * If we get an error while cleaning up a
+ * symlink we bail out.
+ */
+ error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
+ xfs_inactive_symlink_rmt(ip, &tp) :
+ xfs_inactive_symlink_local(ip, &tp);
+
+ if (error) {
+ ASSERT(tp == NULL);
+ return VN_INACTIVE_CACHE;
+ }
+
+ xfs_trans_ijoin(tp, ip, 0);
+ } else {
+ error = xfs_trans_reserve(tp, 0,
+ XFS_IFREE_LOG_RES(mp),
+ 0, XFS_TRANS_PERM_LOG_RES,
+ XFS_INACTIVE_LOG_COUNT);
+ if (error) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ return VN_INACTIVE_CACHE;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+ }
+
+ /*
+ * If there are attributes associated with the file
+ * then blow them away now. The code calls a routine
+ * that recursively deconstructs the attribute fork.
+ * We need to just commit the current transaction
+ * because we can't use it for xfs_attr_inactive().
+ */
+ if (ip->i_d.di_anextents > 0) {
+ error = xfs_inactive_attrs(ip, &tp);
+ /*
+ * If we got an error, the transaction is already
+ * cancelled, and the inode is unlocked. Just get out.
+ */
+ if (error)
+ return VN_INACTIVE_CACHE;
+ } else if (ip->i_afp) {
+ xfs_idestroy_fork(ip, XFS_ATTR_FORK);
+ }
+
+ /*
+ * Free the inode.
+ */
+ xfs_bmap_init(&free_list, &first_block);
+ error = xfs_ifree(tp, ip, &free_list);
+ if (error) {
+ /*
+ * If we fail to free the inode, shut down. The cancel
+ * might do that, we need to make sure. Otherwise the
+ * inode might be lost for a long time or forever.
+ */
+ if (!XFS_FORCED_SHUTDOWN(mp)) {
+ xfs_notice(mp, "%s: xfs_ifree returned error %d",
+ __func__, error);
+ xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
+ }
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+ } else {
+ /*
+ * Credit the quota account(s). The inode is gone.
+ */
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
+
+ /*
+ * Just ignore errors at this point. There is nothing we can
+ * do except to try to keep going. Make sure it's not a silent
+ * error.
+ */
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error)
+ xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
+ __func__, error);
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ if (error)
+ xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
+ __func__, error);
+ }
+
+ /*
+ * Release the dquots held by inode, if any.
+ */
+ xfs_qm_dqdetach(ip);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+
+ out:
+ return VN_INACTIVE_CACHE;
+}
+
+/*
+ * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
+ * is allowed, otherwise it has to be an exact match. If a CI match is found,
+ * ci_name->name will point to a the actual name (caller must free) or
+ * will be set to NULL if an exact match is found.
+ */
+int
+xfs_lookup(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_inode_t **ipp,
+ struct xfs_name *ci_name)
+{
+ xfs_ino_t inum;
+ int error;
+ uint lock_mode;
+
+ trace_xfs_lookup(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(dp->i_mount))
+ return XFS_ERROR(EIO);
+
+ lock_mode = xfs_ilock_map_shared(dp);
+ error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
+ xfs_iunlock_map_shared(dp, lock_mode);
+
+ if (error)
+ goto out;
+
+ error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
+ if (error)
+ goto out_free_name;
+
+ return 0;
+
+out_free_name:
+ if (ci_name)
+ kmem_free(ci_name->name);
+out:
+ *ipp = NULL;
+ return error;
+}
+
+int
+xfs_create(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ umode_t mode,
+ xfs_dev_t rdev,
+ xfs_inode_t **ipp)
+{
+ int is_dir = S_ISDIR(mode);
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_inode *ip = NULL;
+ struct xfs_trans *tp = NULL;
+ int error;
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ boolean_t unlock_dp_on_error = B_FALSE;
+ uint cancel_flags;
+ int committed;
+ prid_t prid;
+ struct xfs_dquot *udqp = NULL;
+ struct xfs_dquot *gdqp = NULL;
+ uint resblks;
+ uint log_res;
+ uint log_count;
+
+ trace_xfs_create(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
+ prid = xfs_get_projid(dp);
+ else
+ prid = XFS_PROJID_DEFAULT;
+
+ /*
+ * Make sure that we have allocated dquot(s) on disk.
+ */
+ error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
+ XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
+ if (error)
+ return error;
+
+ if (is_dir) {
+ rdev = 0;
+ resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
+ log_res = XFS_MKDIR_LOG_RES(mp);
+ log_count = XFS_MKDIR_LOG_COUNT;
+ tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
+ } else {
+ resblks = XFS_CREATE_SPACE_RES(mp, name->len);
+ log_res = XFS_CREATE_LOG_RES(mp);
+ log_count = XFS_CREATE_LOG_COUNT;
+ tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
+ }
+
+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+
+ /*
+ * Initially assume that the file does not exist and
+ * reserve the resources for that case. If that is not
+ * the case we'll drop the one we have and get a more
+ * appropriate transaction later.
+ */
+ error = xfs_trans_reserve(tp, resblks, log_res, 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ if (error == ENOSPC) {
+ /* flush outstanding delalloc blocks and retry */
+ xfs_flush_inodes(dp);
+ error = xfs_trans_reserve(tp, resblks, log_res, 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ }
+ if (error == ENOSPC) {
+ /* No space at all so try a "no-allocation" reservation */
+ resblks = 0;
+ error = xfs_trans_reserve(tp, 0, log_res, 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ }
+ if (error) {
+ cancel_flags = 0;
+ goto out_trans_cancel;
+ }
+
+ xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
+ unlock_dp_on_error = B_TRUE;
+
+ xfs_bmap_init(&free_list, &first_block);
+
+ /*
+ * Reserve disk quota and the inode.
+ */
+ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
+ if (error)
+ goto out_trans_cancel;
+
+ error = xfs_dir_canenter(tp, dp, name, resblks);
+ if (error)
+ goto out_trans_cancel;
+
+ /*
+ * A newly created regular or special file just has one directory
+ * entry pointing to them, but a directory also the "." entry
+ * pointing to itself.
+ */
+ error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
+ prid, resblks > 0, &ip, &committed);
+ if (error) {
+ if (error == ENOSPC)
+ goto out_trans_cancel;
+ goto out_trans_abort;
+ }
+
+ /*
+ * Now we join the directory inode to the transaction. We do not do it
+ * earlier because xfs_dir_ialloc might commit the previous transaction
+ * (and release all the locks). An error from here on will result in
+ * the transaction cancel unlocking dp so don't do it explicitly in the
+ * error path.
+ */
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
+ unlock_dp_on_error = B_FALSE;
+
+ error = xfs_dir_createname(tp, dp, name, ip->i_ino,
+ &first_block, &free_list, resblks ?
+ resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
+ if (error) {
+ ASSERT(error != ENOSPC);
+ goto out_trans_abort;
+ }
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+
+ if (is_dir) {
+ error = xfs_dir_init(tp, ip, dp);
+ if (error)
+ goto out_bmap_cancel;
+
+ error = xfs_bumplink(tp, dp);
+ if (error)
+ goto out_bmap_cancel;
+ }
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * create transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ /*
+ * Attach the dquot(s) to the inodes and modify them incore.
+ * These ids of the inode couldn't have changed since the new
+ * inode has been locked ever since it was created.
+ */
+ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
+
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error)
+ goto out_bmap_cancel;
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ if (error)
+ goto out_release_inode;
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+
+ *ipp = ip;
+ return 0;
+
+ out_bmap_cancel:
+ xfs_bmap_cancel(&free_list);
+ out_trans_abort:
+ cancel_flags |= XFS_TRANS_ABORT;
+ out_trans_cancel:
+ xfs_trans_cancel(tp, cancel_flags);
+ out_release_inode:
+ /*
+ * Wait until after the current transaction is aborted to
+ * release the inode. This prevents recursive transactions
+ * and deadlocks from xfs_inactive.
+ */
+ if (ip)
+ IRELE(ip);
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+
+ if (unlock_dp_on_error)
+ xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ return error;
+}
+
+#ifdef DEBUG
+int xfs_locked_n;
+int xfs_small_retries;
+int xfs_middle_retries;
+int xfs_lots_retries;
+int xfs_lock_delays;
+#endif
+
+/*
+ * Bump the subclass so xfs_lock_inodes() acquires each lock with
+ * a different value
+ */
+static inline int
+xfs_lock_inumorder(int lock_mode, int subclass)
+{
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
+ lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
+ if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
+ lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
+
+ return lock_mode;
+}
+
+/*
+ * The following routine will lock n inodes in exclusive mode.
+ * We assume the caller calls us with the inodes in i_ino order.
+ *
+ * We need to detect deadlock where an inode that we lock
+ * is in the AIL and we start waiting for another inode that is locked
+ * by a thread in a long running transaction (such as truncate). This can
+ * result in deadlock since the long running trans might need to wait
+ * for the inode we just locked in order to push the tail and free space
+ * in the log.
+ */
+void
+xfs_lock_inodes(
+ xfs_inode_t **ips,
+ int inodes,
+ uint lock_mode)
+{
+ int attempts = 0, i, j, try_lock;
+ xfs_log_item_t *lp;
+
+ ASSERT(ips && (inodes >= 2)); /* we need at least two */
+
+ try_lock = 0;
+ i = 0;
+
+again:
+ for (; i < inodes; i++) {
+ ASSERT(ips[i]);
+
+ if (i && (ips[i] == ips[i-1])) /* Already locked */
+ continue;
+
+ /*
+ * If try_lock is not set yet, make sure all locked inodes
+ * are not in the AIL.
+ * If any are, set try_lock to be used later.
+ */
+
+ if (!try_lock) {
+ for (j = (i - 1); j >= 0 && !try_lock; j--) {
+ lp = (xfs_log_item_t *)ips[j]->i_itemp;
+ if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
+ try_lock++;
+ }
+ }
+ }
+
+ /*
+ * If any of the previous locks we have locked is in the AIL,
+ * we must TRY to get the second and subsequent locks. If
+ * we can't get any, we must release all we have
+ * and try again.
+ */
+
+ if (try_lock) {
+ /* try_lock must be 0 if i is 0. */
+ /*
+ * try_lock means we have an inode locked
+ * that is in the AIL.
+ */
+ ASSERT(i != 0);
+ if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
+ attempts++;
+
+ /*
+ * Unlock all previous guys and try again.
+ * xfs_iunlock will try to push the tail
+ * if the inode is in the AIL.
+ */
+
+ for(j = i - 1; j >= 0; j--) {
+
+ /*
+ * Check to see if we've already
+ * unlocked this one.
+ * Not the first one going back,
+ * and the inode ptr is the same.
+ */
+ if ((j != (i - 1)) && ips[j] ==
+ ips[j+1])
+ continue;
+
+ xfs_iunlock(ips[j], lock_mode);
+ }
+
+ if ((attempts % 5) == 0) {
+ delay(1); /* Don't just spin the CPU */
+#ifdef DEBUG
+ xfs_lock_delays++;
+#endif
+ }
+ i = 0;
+ try_lock = 0;
+ goto again;
+ }
+ } else {
+ xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
+ }
+ }
+
+#ifdef DEBUG
+ if (attempts) {
+ if (attempts < 5) xfs_small_retries++;
+ else if (attempts < 100) xfs_middle_retries++;
+ else xfs_lots_retries++;
+ } else {
+ xfs_locked_n++;
+ }
+#endif
+}
+
+/*
+ * xfs_lock_two_inodes() can only be used to lock one type of lock
+ * at a time - the iolock or the ilock, but not both at once. If
+ * we lock both at once, lockdep will report false positives saying
+ * we have violated locking orders.
+ */
+void
+xfs_lock_two_inodes(
+ xfs_inode_t *ip0,
+ xfs_inode_t *ip1,
+ uint lock_mode)
+{
+ xfs_inode_t *temp;
+ int attempts = 0;
+ xfs_log_item_t *lp;
+
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
+ ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
+ ASSERT(ip0->i_ino != ip1->i_ino);
+
+ if (ip0->i_ino > ip1->i_ino) {
+ temp = ip0;
+ ip0 = ip1;
+ ip1 = temp;
+ }
+
+ again:
+ xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
+
+ /*
+ * If the first lock we have locked is in the AIL, we must TRY to get
+ * the second lock. If we can't get it, we must release the first one
+ * and try again.
+ */
+ lp = (xfs_log_item_t *)ip0->i_itemp;
+ if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
+ if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
+ xfs_iunlock(ip0, lock_mode);
+ if ((++attempts % 5) == 0)
+ delay(1); /* Don't just spin the CPU */
+ goto again;
+ }
+ } else {
+ xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
+ }
+}
+
+int
+xfs_remove(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_inode_t *ip)
+{
+ xfs_mount_t *mp = dp->i_mount;
+ xfs_trans_t *tp = NULL;
+ int is_dir = S_ISDIR(ip->i_d.di_mode);
+ int error = 0;
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ int cancel_flags;
+ int committed;
+ int link_zero;
+ uint resblks;
+ uint log_count;
+
+ trace_xfs_remove(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ error = xfs_qm_dqattach(dp, 0);
+ if (error)
+ goto std_return;
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ goto std_return;
+
+ if (is_dir) {
+ tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
+ log_count = XFS_DEFAULT_LOG_COUNT;
+ } else {
+ tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
+ log_count = XFS_REMOVE_LOG_COUNT;
+ }
+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+
+ /*
+ * We try to get the real space reservation first,
+ * allowing for directory btree deletion(s) implying
+ * possible bmap insert(s). If we can't get the space
+ * reservation then we use 0 instead, and avoid the bmap
+ * btree insert(s) in the directory code by, if the bmap
+ * insert tries to happen, instead trimming the LAST
+ * block from the directory.
+ */
+ resblks = XFS_REMOVE_SPACE_RES(mp);
+ error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ if (error == ENOSPC) {
+ resblks = 0;
+ error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ }
+ if (error) {
+ ASSERT(error != ENOSPC);
+ cancel_flags = 0;
+ goto out_trans_cancel;
+ }
+
+ xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
+
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ /*
+ * If we're removing a directory perform some additional validation.
+ */
+ if (is_dir) {
+ ASSERT(ip->i_d.di_nlink >= 2);
+ if (ip->i_d.di_nlink != 2) {
+ error = XFS_ERROR(ENOTEMPTY);
+ goto out_trans_cancel;
+ }
+ if (!xfs_dir_isempty(ip)) {
+ error = XFS_ERROR(ENOTEMPTY);
+ goto out_trans_cancel;
+ }
+ }
+
+ xfs_bmap_init(&free_list, &first_block);
+ error = xfs_dir_removename(tp, dp, name, ip->i_ino,
+ &first_block, &free_list, resblks);
+ if (error) {
+ ASSERT(error != ENOENT);
+ goto out_bmap_cancel;
+ }
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+
+ if (is_dir) {
+ /*
+ * Drop the link from ip's "..".
+ */
+ error = xfs_droplink(tp, dp);
+ if (error)
+ goto out_bmap_cancel;
+
+ /*
+ * Drop the "." link from ip to self.
+ */
+ error = xfs_droplink(tp, ip);
+ if (error)
+ goto out_bmap_cancel;
+ } else {
+ /*
+ * When removing a non-directory we need to log the parent
+ * inode here. For a directory this is done implicitly
+ * by the xfs_droplink call for the ".." entry.
+ */
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ }
+
+ /*
+ * Drop the link from dp to ip.
+ */
+ error = xfs_droplink(tp, ip);
+ if (error)
+ goto out_bmap_cancel;
+
+ /*
+ * Determine if this is the last link while
+ * we are in the transaction.
+ */
+ link_zero = (ip->i_d.di_nlink == 0);
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * remove transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error)
+ goto out_bmap_cancel;
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ if (error)
+ goto std_return;
+
+ /*
+ * If we are using filestreams, kill the stream association.
+ * If the file is still open it may get a new one but that
+ * will get killed on last close in xfs_close() so we don't
+ * have to worry about that.
+ */
+ if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
+ xfs_filestream_deassociate(ip);
+
+ return 0;
+
+ out_bmap_cancel:
+ xfs_bmap_cancel(&free_list);
+ cancel_flags |= XFS_TRANS_ABORT;
+ out_trans_cancel:
+ xfs_trans_cancel(tp, cancel_flags);
+ std_return:
+ return error;
+}
+
+int
+xfs_link(
+ xfs_inode_t *tdp,
+ xfs_inode_t *sip,
+ struct xfs_name *target_name)
+{
+ xfs_mount_t *mp = tdp->i_mount;
+ xfs_trans_t *tp;
+ int error;
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ int cancel_flags;
+ int committed;
+ int resblks;
+
+ trace_xfs_link(tdp, target_name);
+
+ ASSERT(!S_ISDIR(sip->i_d.di_mode));
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ error = xfs_qm_dqattach(sip, 0);
+ if (error)
+ goto std_return;
+
+ error = xfs_qm_dqattach(tdp, 0);
+ if (error)
+ goto std_return;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+ resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
+ error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
+ if (error == ENOSPC) {
+ resblks = 0;
+ error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
+ }
+ if (error) {
+ cancel_flags = 0;
+ goto error_return;
+ }
+
+ xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
+
+ xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
+
+ /*
+ * If we are using project inheritance, we only allow hard link
+ * creation in our tree when the project IDs are the same; else
+ * the tree quota mechanism could be circumvented.
+ */
+ if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
+ (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
+ error = XFS_ERROR(EXDEV);
+ goto error_return;
+ }
+
+ error = xfs_dir_canenter(tp, tdp, target_name, resblks);
+ if (error)
+ goto error_return;
+
+ xfs_bmap_init(&free_list, &first_block);
+
+ error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
+ &first_block, &free_list, resblks);
+ if (error)
+ goto abort_return;
+ xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
+
+ error = xfs_bumplink(tp, sip);
+ if (error)
+ goto abort_return;
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * link transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
+ xfs_trans_set_sync(tp);
+ }
+
+ error = xfs_bmap_finish (&tp, &free_list, &committed);
+ if (error) {
+ xfs_bmap_cancel(&free_list);
+ goto abort_return;
+ }
+
+ return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+
+ abort_return:
+ cancel_flags |= XFS_TRANS_ABORT;
+ error_return:
+ xfs_trans_cancel(tp, cancel_flags);
+ std_return:
+ return error;
+}
+
+int
+xfs_symlink(
+ xfs_inode_t *dp,
+ struct xfs_name *link_name,
+ const char *target_path,
+ umode_t mode,
+ xfs_inode_t **ipp)
+{
+ xfs_mount_t *mp = dp->i_mount;
+ xfs_trans_t *tp;
+ xfs_inode_t *ip;
+ int error;
+ int pathlen;
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ boolean_t unlock_dp_on_error = B_FALSE;
+ uint cancel_flags;
+ int committed;
+ xfs_fileoff_t first_fsb;
+ xfs_filblks_t fs_blocks;
+ int nmaps;
+ xfs_bmbt_irec_t mval[SYMLINK_MAPS];
+ xfs_daddr_t d;
+ const char *cur_chunk;
+ int byte_cnt;
+ int n;
+ xfs_buf_t *bp;
+ prid_t prid;
+ struct xfs_dquot *udqp, *gdqp;
+ uint resblks;
+
+ *ipp = NULL;
+ error = 0;
+ ip = NULL;
+ tp = NULL;
+
+ trace_xfs_symlink(dp, link_name);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ /*
+ * Check component lengths of the target path name.
+ */
+ pathlen = strlen(target_path);
+ if (pathlen >= MAXPATHLEN) /* total string too long */
+ return XFS_ERROR(ENAMETOOLONG);
+
+ udqp = gdqp = NULL;
+ if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
+ prid = xfs_get_projid(dp);
+ else
+ prid = XFS_PROJID_DEFAULT;
+
+ /*
+ * Make sure that we have allocated dquot(s) on disk.
+ */
+ error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
+ XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
+ if (error)
+ goto std_return;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+ /*
+ * The symlink will fit into the inode data fork?
+ * There can't be any attributes so we get the whole variable part.
+ */
+ if (pathlen <= XFS_LITINO(mp))
+ fs_blocks = 0;
+ else
+ fs_blocks = XFS_B_TO_FSB(mp, pathlen);
+ resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
+ error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
+ if (error == ENOSPC && fs_blocks == 0) {
+ resblks = 0;
+ error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
+ }
+ if (error) {
+ cancel_flags = 0;
+ goto error_return;
+ }
+
+ xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
+ unlock_dp_on_error = B_TRUE;
+
+ /*
+ * Check whether the directory allows new symlinks or not.
+ */
+ if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
+ error = XFS_ERROR(EPERM);
+ goto error_return;
+ }
+
+ /*
+ * Reserve disk quota : blocks and inode.
+ */
+ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
+ if (error)
+ goto error_return;
+
+ /*
+ * Check for ability to enter directory entry, if no space reserved.
+ */
+ error = xfs_dir_canenter(tp, dp, link_name, resblks);
+ if (error)
+ goto error_return;
+ /*
+ * Initialize the bmap freelist prior to calling either
+ * bmapi or the directory create code.
+ */
+ xfs_bmap_init(&free_list, &first_block);
+
+ /*
+ * Allocate an inode for the symlink.
+ */
+ error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
+ prid, resblks > 0, &ip, NULL);
+ if (error) {
+ if (error == ENOSPC)
+ goto error_return;
+ goto error1;
+ }
+
+ /*
+ * An error after we've joined dp to the transaction will result in the
+ * transaction cancel unlocking dp so don't do it explicitly in the
+ * error path.
+ */
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
+ unlock_dp_on_error = B_FALSE;
+
+ /*
+ * Also attach the dquot(s) to it, if applicable.
+ */
+ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
+
+ if (resblks)
+ resblks -= XFS_IALLOC_SPACE_RES(mp);
+ /*
+ * If the symlink will fit into the inode, write it inline.
+ */
+ if (pathlen <= XFS_IFORK_DSIZE(ip)) {
+ xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
+ memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
+ ip->i_d.di_size = pathlen;
+
+ /*
+ * The inode was initially created in extent format.
+ */
+ ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
+ ip->i_df.if_flags |= XFS_IFINLINE;
+
+ ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
+
+ } else {
+ first_fsb = 0;
+ nmaps = SYMLINK_MAPS;
+
+ error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
+ XFS_BMAPI_METADATA, &first_block, resblks,
+ mval, &nmaps, &free_list);
+ if (error)
+ goto error2;
+
+ if (resblks)
+ resblks -= fs_blocks;
+ ip->i_d.di_size = pathlen;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ cur_chunk = target_path;
+ for (n = 0; n < nmaps; n++) {
+ d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
+ byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
+ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
+ BTOBB(byte_cnt), 0);
+ if (!bp) {
+ error = ENOMEM;
+ goto error2;
+ }
+ if (pathlen < byte_cnt) {
+ byte_cnt = pathlen;
+ }
+ pathlen -= byte_cnt;
+
+ memcpy(bp->b_addr, cur_chunk, byte_cnt);
+ cur_chunk += byte_cnt;
+
+ xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
+ }
+ }
+
+ /*
+ * Create the directory entry for the symlink.
+ */
+ error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
+ &first_block, &free_list, resblks);
+ if (error)
+ goto error2;
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * symlink transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
+ xfs_trans_set_sync(tp);
+ }
+
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error) {
+ goto error2;
+ }
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+
+ *ipp = ip;
+ return 0;
+
+ error2:
+ IRELE(ip);
+ error1:
+ xfs_bmap_cancel(&free_list);
+ cancel_flags |= XFS_TRANS_ABORT;
+ error_return:
+ xfs_trans_cancel(tp, cancel_flags);
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+
+ if (unlock_dp_on_error)
+ xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ std_return:
+ return error;
+}
+
+int
+xfs_set_dmattrs(
+ xfs_inode_t *ip,
+ u_int evmask,
+ u_int16_t state)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_trans_t *tp;
+ int error;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return XFS_ERROR(EPERM);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
+ error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
+ if (error) {
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ ip->i_d.di_dmevmask = evmask;
+ ip->i_d.di_dmstate = state;
+
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ error = xfs_trans_commit(tp, 0);
+
+ return error;
+}
+
+/*
+ * xfs_alloc_file_space()
+ * This routine allocates disk space for the given file.
+ *
+ * If alloc_type == 0, this request is for an ALLOCSP type
+ * request which will change the file size. In this case, no
+ * DMAPI event will be generated by the call. A TRUNCATE event
+ * will be generated later by xfs_setattr.
+ *
+ * If alloc_type != 0, this request is for a RESVSP type
+ * request, and a DMAPI DM_EVENT_WRITE will be generated if the
+ * lower block boundary byte address is less than the file's
+ * length.
+ *
+ * RETURNS:
+ * 0 on success
+ * errno on error
+ *
+ */
+STATIC int
+xfs_alloc_file_space(
+ xfs_inode_t *ip,
+ xfs_off_t offset,
+ xfs_off_t len,
+ int alloc_type,
+ int attr_flags)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_off_t count;
+ xfs_filblks_t allocated_fsb;
+ xfs_filblks_t allocatesize_fsb;
+ xfs_extlen_t extsz, temp;
+ xfs_fileoff_t startoffset_fsb;
+ xfs_fsblock_t firstfsb;
+ int nimaps;
+ int quota_flag;
+ int rt;
+ xfs_trans_t *tp;
+ xfs_bmbt_irec_t imaps[1], *imapp;
+ xfs_bmap_free_t free_list;
+ uint qblocks, resblks, resrtextents;
+ int committed;
+ int error;
+
+ trace_xfs_alloc_file_space(ip);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return error;
+
+ if (len <= 0)
+ return XFS_ERROR(EINVAL);
+
+ rt = XFS_IS_REALTIME_INODE(ip);
+ extsz = xfs_get_extsz_hint(ip);
+
+ count = len;
+ imapp = &imaps[0];
+ nimaps = 1;
+ startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
+ allocatesize_fsb = XFS_B_TO_FSB(mp, count);
+
+ /*
+ * Allocate file space until done or until there is an error
+ */
+ while (allocatesize_fsb && !error) {
+ xfs_fileoff_t s, e;
+
+ /*
+ * Determine space reservations for data/realtime.
+ */
+ if (unlikely(extsz)) {
+ s = startoffset_fsb;
+ do_div(s, extsz);
+ s *= extsz;
+ e = startoffset_fsb + allocatesize_fsb;
+ if ((temp = do_mod(startoffset_fsb, extsz)))
+ e += temp;
+ if ((temp = do_mod(e, extsz)))
+ e += extsz - temp;
+ } else {
+ s = 0;
+ e = allocatesize_fsb;
+ }
+
+ /*
+ * The transaction reservation is limited to a 32-bit block
+ * count, hence we need to limit the number of blocks we are
+ * trying to reserve to avoid an overflow. We can't allocate
+ * more than @nimaps extents, and an extent is limited on disk
+ * to MAXEXTLEN (21 bits), so use that to enforce the limit.
+ */
+ resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
+ if (unlikely(rt)) {
+ resrtextents = qblocks = resblks;
+ resrtextents /= mp->m_sb.sb_rextsize;
+ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+ quota_flag = XFS_QMOPT_RES_RTBLKS;
+ } else {
+ resrtextents = 0;
+ resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
+ quota_flag = XFS_QMOPT_RES_REGBLKS;
+ }
+
+ /*
+ * Allocate and setup the transaction.
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
+ error = xfs_trans_reserve(tp, resblks,
+ XFS_WRITE_LOG_RES(mp), resrtextents,
+ XFS_TRANS_PERM_LOG_RES,
+ XFS_WRITE_LOG_COUNT);
+ /*
+ * Check for running out of space
+ */
+ if (error) {
+ /*
+ * Free the transaction structure.
+ */
+ ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ break;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
+ 0, quota_flag);
+ if (error)
+ goto error1;
+
+ xfs_trans_ijoin(tp, ip, 0);
+
+ xfs_bmap_init(&free_list, &firstfsb);
+ error = xfs_bmapi_write(tp, ip, startoffset_fsb,
+ allocatesize_fsb, alloc_type, &firstfsb,
+ 0, imapp, &nimaps, &free_list);
+ if (error) {
+ goto error0;
+ }
+
+ /*
+ * Complete the transaction
+ */
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error) {
+ goto error0;
+ }
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (error) {
+ break;
+ }
+
+ allocated_fsb = imapp->br_blockcount;
+
+ if (nimaps == 0) {
+ error = XFS_ERROR(ENOSPC);
+ break;
+ }
+
+ startoffset_fsb += allocated_fsb;
+ allocatesize_fsb -= allocated_fsb;
+ }
+
+ return error;
+
+error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
+ xfs_bmap_cancel(&free_list);
+ xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
+
+error1: /* Just cancel transaction */
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+/*
+ * Zero file bytes between startoff and endoff inclusive.
+ * The iolock is held exclusive and no blocks are buffered.
+ *
+ * This function is used by xfs_free_file_space() to zero
+ * partial blocks when the range to free is not block aligned.
+ * When unreserving space with boundaries that are not block
+ * aligned we round up the start and round down the end
+ * boundaries and then use this function to zero the parts of
+ * the blocks that got dropped during the rounding.
+ */
+STATIC int
+xfs_zero_remaining_bytes(
+ xfs_inode_t *ip,
+ xfs_off_t startoff,
+ xfs_off_t endoff)
+{
+ xfs_bmbt_irec_t imap;
+ xfs_fileoff_t offset_fsb;
+ xfs_off_t lastoffset;
+ xfs_off_t offset;
+ xfs_buf_t *bp;
+ xfs_mount_t *mp = ip->i_mount;
+ int nimap;
+ int error = 0;
+
+ /*
+ * Avoid doing I/O beyond eof - it's not necessary
+ * since nothing can read beyond eof. The space will
+ * be zeroed when the file is extended anyway.
+ */
+ if (startoff >= XFS_ISIZE(ip))
+ return 0;
+
+ if (endoff > XFS_ISIZE(ip))
+ endoff = XFS_ISIZE(ip);
+
+ bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
+ mp->m_rtdev_targp : mp->m_ddev_targp,
+ mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
+ if (!bp)
+ return XFS_ERROR(ENOMEM);
+
+ xfs_buf_unlock(bp);
+
+ for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ nimap = 1;
+ error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
+ if (error || nimap < 1)
+ break;
+ ASSERT(imap.br_blockcount >= 1);
+ ASSERT(imap.br_startoff == offset_fsb);
+ lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
+ if (lastoffset > endoff)
+ lastoffset = endoff;
+ if (imap.br_startblock == HOLESTARTBLOCK)
+ continue;
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ if (imap.br_state == XFS_EXT_UNWRITTEN)
+ continue;
+ XFS_BUF_UNDONE(bp);
+ XFS_BUF_UNWRITE(bp);
+ XFS_BUF_READ(bp);
+ XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
+ xfsbdstrat(mp, bp);
+ error = xfs_buf_iowait(bp);
+ if (error) {
+ xfs_buf_ioerror_alert(bp,
+ "xfs_zero_remaining_bytes(read)");
+ break;
+ }
+ memset(bp->b_addr +
+ (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
+ 0, lastoffset - offset + 1);
+ XFS_BUF_UNDONE(bp);
+ XFS_BUF_UNREAD(bp);
+ XFS_BUF_WRITE(bp);
+ xfsbdstrat(mp, bp);
+ error = xfs_buf_iowait(bp);
+ if (error) {
+ xfs_buf_ioerror_alert(bp,
+ "xfs_zero_remaining_bytes(write)");
+ break;
+ }
+ }
+ xfs_buf_free(bp);
+ return error;
+}
+
+/*
+ * xfs_free_file_space()
+ * This routine frees disk space for the given file.
+ *
+ * This routine is only called by xfs_change_file_space
+ * for an UNRESVSP type call.
+ *
+ * RETURNS:
+ * 0 on success
+ * errno on error
+ *
+ */
+STATIC int
+xfs_free_file_space(
+ xfs_inode_t *ip,
+ xfs_off_t offset,
+ xfs_off_t len,
+ int attr_flags)
+{
+ int committed;
+ int done;
+ xfs_fileoff_t endoffset_fsb;
+ int error;
+ xfs_fsblock_t firstfsb;
+ xfs_bmap_free_t free_list;
+ xfs_bmbt_irec_t imap;
+ xfs_off_t ioffset;
+ xfs_extlen_t mod=0;
+ xfs_mount_t *mp;
+ int nimap;
+ uint resblks;
+ uint rounding;
+ int rt;
+ xfs_fileoff_t startoffset_fsb;
+ xfs_trans_t *tp;
+ int need_iolock = 1;
+
+ mp = ip->i_mount;
+
+ trace_xfs_free_file_space(ip);
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return error;
+
+ error = 0;
+ if (len <= 0) /* if nothing being freed */
+ return error;
+ rt = XFS_IS_REALTIME_INODE(ip);
+ startoffset_fsb = XFS_B_TO_FSB(mp, offset);
+ endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
+
+ if (attr_flags & XFS_ATTR_NOLOCK)
+ need_iolock = 0;
+ if (need_iolock) {
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+ /* wait for the completion of any pending DIOs */
+ inode_dio_wait(VFS_I(ip));
+ }
+
+ rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
+ ioffset = offset & ~(rounding - 1);
+
+ if (VN_CACHED(VFS_I(ip)) != 0) {
+ error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
+ if (error)
+ goto out_unlock_iolock;
+ }
+
+ /*
+ * Need to zero the stuff we're not freeing, on disk.
+ * If it's a realtime file & can't use unwritten extents then we
+ * actually need to zero the extent edges. Otherwise xfs_bunmapi
+ * will take care of it for us.
+ */
+ if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
+ nimap = 1;
+ error = xfs_bmapi_read(ip, startoffset_fsb, 1,
+ &imap, &nimap, 0);
+ if (error)
+ goto out_unlock_iolock;
+ ASSERT(nimap == 0 || nimap == 1);
+ if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
+ xfs_daddr_t block;
+
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ block = imap.br_startblock;
+ mod = do_div(block, mp->m_sb.sb_rextsize);
+ if (mod)
+ startoffset_fsb += mp->m_sb.sb_rextsize - mod;
+ }
+ nimap = 1;
+ error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
+ &imap, &nimap, 0);
+ if (error)
+ goto out_unlock_iolock;
+ ASSERT(nimap == 0 || nimap == 1);
+ if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ mod++;
+ if (mod && (mod != mp->m_sb.sb_rextsize))
+ endoffset_fsb -= mod;
+ }
+ }
+ if ((done = (endoffset_fsb <= startoffset_fsb)))
+ /*
+ * One contiguous piece to clear
+ */
+ error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
+ else {
+ /*
+ * Some full blocks, possibly two pieces to clear
+ */
+ if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
+ error = xfs_zero_remaining_bytes(ip, offset,
+ XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
+ if (!error &&
+ XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
+ error = xfs_zero_remaining_bytes(ip,
+ XFS_FSB_TO_B(mp, endoffset_fsb),
+ offset + len - 1);
+ }
+
+ /*
+ * free file space until done or until there is an error
+ */
+ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+ while (!error && !done) {
+
+ /*
+ * allocate and setup the transaction. Allow this
+ * transaction to dip into the reserve blocks to ensure
+ * the freeing of the space succeeds at ENOSPC.
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
+ tp->t_flags |= XFS_TRANS_RESERVE;
+ error = xfs_trans_reserve(tp,
+ resblks,
+ XFS_WRITE_LOG_RES(mp),
+ 0,
+ XFS_TRANS_PERM_LOG_RES,
+ XFS_WRITE_LOG_COUNT);
+
+ /*
+ * check for running out of space
+ */
+ if (error) {
+ /*
+ * Free the transaction structure.
+ */
+ ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ break;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_trans_reserve_quota(tp, mp,
+ ip->i_udquot, ip->i_gdquot,
+ resblks, 0, XFS_QMOPT_RES_REGBLKS);
+ if (error)
+ goto error1;
+
+ xfs_trans_ijoin(tp, ip, 0);
+
+ /*
+ * issue the bunmapi() call to free the blocks
+ */
+ xfs_bmap_init(&free_list, &firstfsb);
+ error = xfs_bunmapi(tp, ip, startoffset_fsb,
+ endoffset_fsb - startoffset_fsb,
+ 0, 2, &firstfsb, &free_list, &done);
+ if (error) {
+ goto error0;
+ }
+
+ /*
+ * complete the transaction
+ */
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error) {
+ goto error0;
+ }
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+
+ out_unlock_iolock:
+ if (need_iolock)
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return error;
+
+ error0:
+ xfs_bmap_cancel(&free_list);
+ error1:
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
+ XFS_ILOCK_EXCL);
+ return error;
+}
+
+/*
+ * xfs_change_file_space()
+ * This routine allocates or frees disk space for the given file.
+ * The user specified parameters are checked for alignment and size
+ * limitations.
+ *
+ * RETURNS:
+ * 0 on success
+ * errno on error
+ *
+ */
+int
+xfs_change_file_space(
+ xfs_inode_t *ip,
+ int cmd,
+ xfs_flock64_t *bf,
+ xfs_off_t offset,
+ int attr_flags)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ int clrprealloc;
+ int error;
+ xfs_fsize_t fsize;
+ int setprealloc;
+ xfs_off_t startoffset;
+ xfs_off_t llen;
+ xfs_trans_t *tp;
+ struct iattr iattr;
+ int prealloc_type;
+
+ if (!S_ISREG(ip->i_d.di_mode))
+ return XFS_ERROR(EINVAL);
+
+ switch (bf->l_whence) {
+ case 0: /*SEEK_SET*/
+ break;
+ case 1: /*SEEK_CUR*/
+ bf->l_start += offset;
+ break;
+ case 2: /*SEEK_END*/
+ bf->l_start += XFS_ISIZE(ip);
+ break;
+ default:
+ return XFS_ERROR(EINVAL);
+ }
+
+ llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
+
+ if ( (bf->l_start < 0)
+ || (bf->l_start > XFS_MAXIOFFSET(mp))
+ || (bf->l_start + llen < 0)
+ || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
+ return XFS_ERROR(EINVAL);
+
+ bf->l_whence = 0;
+
+ startoffset = bf->l_start;
+ fsize = XFS_ISIZE(ip);
+
+ /*
+ * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
+ * file space.
+ * These calls do NOT zero the data space allocated to the file,
+ * nor do they change the file size.
+ *
+ * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
+ * space.
+ * These calls cause the new file data to be zeroed and the file
+ * size to be changed.
+ */
+ setprealloc = clrprealloc = 0;
+ prealloc_type = XFS_BMAPI_PREALLOC;
+
+ switch (cmd) {
+ case XFS_IOC_ZERO_RANGE:
+ prealloc_type |= XFS_BMAPI_CONVERT;
+ xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
+ /* FALLTHRU */
+ case XFS_IOC_RESVSP:
+ case XFS_IOC_RESVSP64:
+ error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
+ prealloc_type, attr_flags);
+ if (error)
+ return error;
+ setprealloc = 1;
+ break;
+
+ case XFS_IOC_UNRESVSP:
+ case XFS_IOC_UNRESVSP64:
+ if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
+ attr_flags)))
+ return error;
+ break;
+
+ case XFS_IOC_ALLOCSP:
+ case XFS_IOC_ALLOCSP64:
+ case XFS_IOC_FREESP:
+ case XFS_IOC_FREESP64:
+ if (startoffset > fsize) {
+ error = xfs_alloc_file_space(ip, fsize,
+ startoffset - fsize, 0, attr_flags);
+ if (error)
+ break;
+ }
+
+ iattr.ia_valid = ATTR_SIZE;
+ iattr.ia_size = startoffset;
+
+ error = xfs_setattr_size(ip, &iattr, attr_flags);
+
+ if (error)
+ return error;
+
+ clrprealloc = 1;
+ break;
+
+ default:
+ ASSERT(0);
+ return XFS_ERROR(EINVAL);
+ }
+
+ /*
+ * update the inode timestamp, mode, and prealloc flag bits
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
+
+ if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
+ 0, 0, 0))) {
+ /* ASSERT(0); */
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ if ((attr_flags & XFS_ATTR_DMI) == 0) {
+ ip->i_d.di_mode &= ~S_ISUID;
+
+ /*
+ * Note that we don't have to worry about mandatory
+ * file locking being disabled here because we only
+ * clear the S_ISGID bit if the Group execute bit is
+ * on, but if it was on then mandatory locking wouldn't
+ * have been enabled.
+ */
+ if (ip->i_d.di_mode & S_IXGRP)
+ ip->i_d.di_mode &= ~S_ISGID;
+
+ xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ }
+ if (setprealloc)
+ ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
+ else if (clrprealloc)
+ ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
+
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ if (attr_flags & XFS_ATTR_SYNC)
+ xfs_trans_set_sync(tp);
+ return xfs_trans_commit(tp, 0);
+}