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xfs: push down inactive transaction mgmt for remote symlinks
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Push down the transaction management for remote symlinks from
xfs_inactive() down to xfs_inactive_symlink_rmt(). The latter is
cleaned up to avoid transaction management intended for the
calling context (i.e., trans duplication, reservation, item
attachment).

Signed-off-by: Brian Foster <[email protected]>
Reviewed-by: Dave Chinner <[email protected]>
Signed-off-by: Ben Myers <[email protected]>
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Brian Foster authored and Ben Myers committed Oct 8, 2013
1 parent 2900a57 commit 36b21dd
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Showing 3 changed files with 49 additions and 54 deletions.
15 changes: 8 additions & 7 deletions fs/xfs/xfs_inode.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1724,9 +1724,14 @@ xfs_inactive(
if (error)
return VN_INACTIVE_CACHE;

if (S_ISLNK(ip->i_d.di_mode)) {
error = xfs_inactive_symlink(ip);
if (error)
goto out;
}

tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
resp = (truncate || S_ISLNK(ip->i_d.di_mode)) ?
&M_RES(mp)->tr_itruncate : &M_RES(mp)->tr_ifree;
resp = truncate ? &M_RES(mp)->tr_itruncate : &M_RES(mp)->tr_ifree;

error = xfs_trans_reserve(tp, resp, 0, 0);
if (error) {
Expand All @@ -1738,11 +1743,7 @@ xfs_inactive(
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, 0);

if (S_ISLNK(ip->i_d.di_mode)) {
error = xfs_inactive_symlink(ip, &tp);
if (error)
goto out_cancel;
} else if (truncate) {
if (truncate) {
ip->i_d.di_size = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

Expand Down
86 changes: 40 additions & 46 deletions fs/xfs/xfs_symlink.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -424,8 +424,7 @@ xfs_symlink(
*/
STATIC int
xfs_inactive_symlink_rmt(
xfs_inode_t *ip,
xfs_trans_t **tpp)
struct xfs_inode *ip)
{
xfs_buf_t *bp;
int committed;
Expand All @@ -437,11 +436,9 @@ xfs_inactive_symlink_rmt(
xfs_mount_t *mp;
xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
int nmaps;
xfs_trans_t *ntp;
int size;
xfs_trans_t *tp;

tp = *tpp;
mp = ip->i_mount;
ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);
/*
Expand All @@ -453,6 +450,16 @@ xfs_inactive_symlink_rmt(
*/
ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);

tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
if (error) {
xfs_trans_cancel(tp, 0);
return error;
}

xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, 0);

/*
* 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
Expand All @@ -471,7 +478,7 @@ xfs_inactive_symlink_rmt(
error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
mval, &nmaps, 0);
if (error)
goto error0;
goto error_trans_cancel;
/*
* Invalidate the block(s). No validation is done.
*/
Expand All @@ -481,22 +488,24 @@ xfs_inactive_symlink_rmt(
XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
if (!bp) {
error = ENOMEM;
goto error1;
goto error_bmap_cancel;
}
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;
error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
&first_block, &free_list, &done);
if (error)
goto error_bmap_cancel;
ASSERT(done);
/*
* Commit the first transaction. This logs the EFI and the inode.
*/
if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
goto error1;
error = xfs_bmap_finish(&tp, &free_list, &committed);
if (error)
goto error_bmap_cancel;
/*
* The transaction must have been committed, since there were
* actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
Expand All @@ -510,51 +519,31 @@ xfs_inactive_symlink_rmt(
*/
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;
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
if (error) {
ASSERT(XFS_FORCED_SHUTDOWN(mp));
goto error0;
goto error_unlock;
}
/*
* 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.
*/
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
if (error) {
ASSERT(XFS_FORCED_SHUTDOWN(mp));
goto error0;
}

xfs_trans_ijoin(tp, ip, 0);
*tpp = tp;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return 0;

error1:
error_bmap_cancel:
xfs_bmap_cancel(&free_list);
error0:
error_trans_cancel:
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
error_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}

Expand All @@ -563,41 +552,46 @@ xfs_inactive_symlink_rmt(
*/
int
xfs_inactive_symlink(
struct xfs_inode *ip,
struct xfs_trans **tp)
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
int pathlen;

trace_xfs_inactive_symlink(ip);

ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);

xfs_ilock(ip, XFS_ILOCK_EXCL);

/*
* Zero length symlinks _can_ exist.
*/
pathlen = (int)ip->i_d.di_size;
if (!pathlen)
if (!pathlen) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return 0;
}

if (pathlen < 0 || pathlen > MAXPATHLEN) {
xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
__func__, (unsigned long long)ip->i_ino, pathlen);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
ASSERT(0);
return XFS_ERROR(EFSCORRUPTED);
}

if (ip->i_df.if_flags & XFS_IFINLINE) {
if (ip->i_df.if_bytes > 0)
if (ip->i_df.if_bytes > 0)
xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
XFS_DATA_FORK);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
ASSERT(ip->i_df.if_bytes == 0);
return 0;
}

xfs_iunlock(ip, XFS_ILOCK_EXCL);

/* remove the remote symlink */
return xfs_inactive_symlink_rmt(ip, tp);
return xfs_inactive_symlink_rmt(ip);
}
2 changes: 1 addition & 1 deletion fs/xfs/xfs_symlink.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,6 @@
int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
const char *target_path, umode_t mode, struct xfs_inode **ipp);
int xfs_readlink(struct xfs_inode *ip, char *link);
int xfs_inactive_symlink(struct xfs_inode *ip, struct xfs_trans **tpp);
int xfs_inactive_symlink(struct xfs_inode *ip);

#endif /* __XFS_SYMLINK_H */

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