[PATCH] XFS: random cleanups of xfs_swap_extents
Josef 'Jeff' Sipek
jeffpc at josefsipek.net
Mon Dec 22 08:58:25 CST 2008
On Mon, Dec 22, 2008 at 08:02:02AM -0500, Christoph Hellwig wrote:
> On Wed, Nov 12, 2008 at 10:39:03AM -0500, Josef 'Jeff' Sipek wrote:
> > > With the one case that does a trans_cancel with partially unlocked
> > > inodes handcoding most of it.
> >
> > Ok, I'll do that.
>
> Did you manage to actually do it? :)
I did, I just didn't have time to run it through xfsqa (well, set up a test
box for xfsqa). Use at your own risk :)
Josef 'Jeff' Sipek.
--
XFS: use multiple labels and gotos for error handling in xfs_swap_extents
Signed-off-by: Josef 'Jeff' Sipek <jeffpc at josefsipek.net>
diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c
index 75b0cd4..ec832bc 100644
--- a/fs/xfs/xfs_dfrag.c
+++ b/fs/xfs/xfs_dfrag.c
@@ -132,19 +132,17 @@ xfs_swap_extents(
xfs_bstat_t *sbp = &sxp->sx_stat;
xfs_ifork_t *tempifp, *ifp, *tifp;
int ilf_fields, tilf_fields;
- static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
int error = 0;
int aforkblks = 0;
int taforkblks = 0;
__uint64_t tmp;
- char locked = 0;
mp = ip->i_mount;
tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
if (!tempifp) {
error = XFS_ERROR(ENOMEM);
- goto error0;
+ goto out;
}
sbp = &sxp->sx_stat;
@@ -157,25 +155,24 @@ xfs_swap_extents(
*/
xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
- locked = 1;
/* Verify that both files have the same format */
if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
error = XFS_ERROR(EINVAL);
- goto error0;
+ goto out_unlock;
}
/* Verify both files are either real-time or non-realtime */
if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
error = XFS_ERROR(EINVAL);
- goto error0;
+ goto out_unlock;
}
/* Should never get a local format */
if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
error = XFS_ERROR(EINVAL);
- goto error0;
+ goto out_unlock;
}
if (VN_CACHED(VFS_I(tip)) != 0) {
@@ -183,13 +180,13 @@ xfs_swap_extents(
error = xfs_flushinval_pages(tip, 0, -1,
FI_REMAPF_LOCKED);
if (error)
- goto error0;
+ goto out_unlock;
}
/* Verify O_DIRECT for ftmp */
if (VN_CACHED(VFS_I(tip)) != 0) {
error = XFS_ERROR(EINVAL);
- goto error0;
+ goto out_unlock;
}
/* Verify all data are being swapped */
@@ -197,7 +194,7 @@ xfs_swap_extents(
sxp->sx_length != ip->i_d.di_size ||
sxp->sx_length != tip->i_d.di_size) {
error = XFS_ERROR(EFAULT);
- goto error0;
+ goto out_unlock;
}
/*
@@ -207,7 +204,7 @@ xfs_swap_extents(
*/
if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
error = XFS_ERROR(EINVAL);
- goto error0;
+ goto out_unlock;
}
/*
@@ -222,7 +219,7 @@ xfs_swap_extents(
(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
error = XFS_ERROR(EBUSY);
- goto error0;
+ goto out_unlock;
}
/* We need to fail if the file is memory mapped. Once we have tossed
@@ -233,7 +230,7 @@ xfs_swap_extents(
*/
if (VN_MAPPED(VFS_I(ip))) {
error = XFS_ERROR(EBUSY);
- goto error0;
+ goto out_unlock;
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
@@ -256,8 +253,7 @@ xfs_swap_extents(
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
xfs_iunlock(tip, XFS_IOLOCK_EXCL);
xfs_trans_cancel(tp, 0);
- locked = 0;
- goto error0;
+ goto out;
}
xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
@@ -267,19 +263,15 @@ xfs_swap_extents(
if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
- if (error) {
- xfs_trans_cancel(tp, 0);
- goto error0;
- }
+ if (error)
+ goto out_trans_cancel;
}
if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
&taforkblks);
- if (error) {
- xfs_trans_cancel(tp, 0);
- goto error0;
- }
+ if (error)
+ goto out_trans_cancel;
}
/*
@@ -346,10 +338,10 @@ xfs_swap_extents(
IHOLD(ip);
- xfs_trans_ijoin(tp, ip, lock_flags);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
IHOLD(tip);
- xfs_trans_ijoin(tp, tip, lock_flags);
+ xfs_trans_ijoin(tp, tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
xfs_trans_log_inode(tp, ip, ilf_fields);
xfs_trans_log_inode(tp, tip, tilf_fields);
@@ -358,19 +350,19 @@ xfs_swap_extents(
* If this is a synchronous mount, make sure that the
* transaction goes to disk before returning to the user.
*/
- if (mp->m_flags & XFS_MOUNT_WSYNC) {
+ if (mp->m_flags & XFS_MOUNT_WSYNC)
xfs_trans_set_sync(tp);
- }
error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
- locked = 0;
- error0:
- if (locked) {
- xfs_iunlock(ip, lock_flags);
- xfs_iunlock(tip, lock_flags);
- }
- if (tempifp != NULL)
- kmem_free(tempifp);
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+out:
+ kmem_free(tempifp);
return error;
+
+out_trans_cancel:
+ xfs_trans_cancel(tp, 0);
+ goto out_unlock;
}
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