leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

xfs: remove all boilerplate defer init/finish code

Browse Source 
At this point, the transaction subsystem completely manages deferred
items internally such that the common and boilerplate
xfs_trans_alloc() -> xfs_defer_init() -> xfs_defer_finish() ->
xfs_trans_commit() sequence can be replaced with a simple
transaction allocation and commit.

Remove all such boilerplate deferred ops code. In doing so, we
change each case over to use the dfops in the transaction and
specifically eliminate:

- The on-stack dfops and associated xfs_defer_init() call, as the
  internal dfops is initialized on transaction allocation.
- xfs_bmap_finish() calls that precede a final xfs_trans_commit() of
  a transaction.
- xfs_defer_cancel() calls in error handlers that precede a
  transaction cancel.

The only deferred ops calls that remain are those that are
non-deterministic with respect to the final commit of the associated
transaction or are open-coded due to special handling.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster
2018-07-24 13:43:13 -07:00
committed by Darrick J. Wong
parent 91ef75b657
commit c8eac49ef7
13 changed files with 44 additions and 232 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
fs/xfs/libxfs/xfs_bmap.c
View File

@@ -1018,7 +1018,6 @@ xfs_bmap_add_attrfork(
int size, /* space new attribute needs */
int rsvd) /* xact may use reserved blks */
{
struct xfs_defer_ops dfops; /* freed extent records */
xfs_mount_t *mp; /* mount structure */
xfs_trans_t *tp; /* transaction pointer */
int blks; /* space reservation */
@@ -1037,7 +1036,6 @@ xfs_bmap_add_attrfork(
rsvd ? XFS_TRANS_RESERVE : 0, &tp);
if (error)
return error;
xfs_defer_init(tp, &dfops);
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
@@ -1102,7 +1100,7 @@ xfs_bmap_add_attrfork(
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (error)
goto bmap_cancel;
goto trans_cancel;
if (!xfs_sb_version_hasattr(&mp->m_sb) ||
(!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
bool log_sb = false;
@@ -1121,15 +1119,10 @@ xfs_bmap_add_attrfork(
xfs_log_sb(tp);
}
error = xfs_defer_finish(&tp, &dfops);
if (error)
goto bmap_cancel;
error = xfs_trans_commit(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
bmap_cancel:
xfs_defer_cancel(&dfops);
trans_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
@@ -5953,14 +5946,12 @@ xfs_bmap_split_extent(
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
struct xfs_defer_ops dfops;
int error;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write,
XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);
if (error)
return error;
xfs_defer_init(tp, &dfops);
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
@@ -5969,14 +5960,9 @@ xfs_bmap_split_extent(
if (error)
goto out;
error = xfs_defer_finish(&tp, &dfops);
if (error)
goto out;
return xfs_trans_commit(tp);
out:
xfs_defer_cancel(&dfops);
xfs_trans_cancel(tp);
return error;
}