From: Dave Chinner <dchinner@xxxxxxxxxx>
The setup of the transaction is done after a random smattering of
checks and before another bunch of ioperations specific
validity checks. Pull all the preamble out into a helper function
that returns a transaction or error.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
fs/xfs/xfs_ioctl.c | 96 +++++++++++++++++++++++++++++-------------------------
1 file changed, 51 insertions(+), 45 deletions(-)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index ba98412..d06f596 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1042,7 +1042,6 @@ xfs_ioctl_setattr_xflags(
!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
- xfs_trans_ijoin(tp, ip, 0);
xfs_set_diflags(ip, fa->fsx_xflags);
xfs_diflags_to_linux(ip);
xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
@@ -1051,6 +1050,54 @@ xfs_ioctl_setattr_xflags(
return 0;
}
+/*
+ * Set up the transaction structure for the setattr operation, checking that we
+ * have permission to do so. On success, return a clean transaction and the
+ * inode locked exclusively ready for futher operation specific checks. On
+ * failure, return an error without modifying or locking the inode.
+ */
+static struct xfs_trans *
+xfs_ioctl_setattr_get_trans(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ int error;
+
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ return ERR_PTR(-EROFS);
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return ERR_PTR(-EIO);
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
+ error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
+ if (error)
+ goto out_cancel;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ /*
+ * CAP_FOWNER overrides the following restrictions:
+ *
+ * The user ID of the calling process must be equal to the file owner
+ * ID, except in cases where the CAP_FSETID capability is applicable.
+ */
+ if (!inode_owner_or_capable(VFS_I(ip))) {
+ error = -EPERM;
+ goto out_cancel;
+ }
+
+ if (mp->m_flags & XFS_MOUNT_WSYNC)
+ xfs_trans_set_sync(tp);
+
+ return tp;
+
+out_cancel:
+ xfs_trans_cancel(tp, 0);
+ return ERR_PTR(error);
+}
+
#define FSX_PROJID 1
#define FSX_EXTSIZE 2
#define FSX_XFLAGS 4
@@ -1063,7 +1110,6 @@ xfs_ioctl_setattr(
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
- unsigned int lock_flags = 0;
struct xfs_dquot *udqp = NULL;
struct xfs_dquot *pdqp = NULL;
struct xfs_dquot *olddquot = NULL;
@@ -1071,11 +1117,6 @@ xfs_ioctl_setattr(
trace_xfs_ioctl_setattr(ip);
- if (mp->m_flags & XFS_MOUNT_RDONLY)
- return -EROFS;
- if (XFS_FORCED_SHUTDOWN(mp))
- return -EIO;
-
/*
* Disallow 32bit project ids when projid32bit feature is not enabled.
*/
@@ -1099,29 +1140,9 @@ xfs_ioctl_setattr(
return code;
}
- /*
- * For the other attributes, we acquire the inode lock and
- * first do an error checking pass.
- */
- tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
- code = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
- if (code)
- goto error_return;
-
- lock_flags = XFS_ILOCK_EXCL;
- xfs_ilock(ip, lock_flags);
-
- /*
- * CAP_FOWNER overrides the following restrictions:
- *
- * The user ID of the calling process must be equal
- * to the file owner ID, except in cases where the
- * CAP_FSETID capability is applicable.
- */
- if (!inode_owner_or_capable(VFS_I(ip))) {
- code = -EPERM;
- goto error_return;
- }
+ tp = xfs_ioctl_setattr_get_trans(ip);
+ if (IS_ERR(tp))
+ return PTR_ERR(tp);
/*
* Do a quota reservation only if projid is actually going to change.
@@ -1244,20 +1265,7 @@ xfs_ioctl_setattr(
ip->i_d.di_extsize = extsize;
}
- /*
- * If this is a synchronous mount, make sure that the
- * transaction goes to disk before returning to the user.
- * This is slightly sub-optimal in that truncates require
- * two sync transactions instead of one for wsync filesystems.
- * One for the truncate and one for the timestamps since we
- * don't want to change the timestamps unless we're sure the
- * truncate worked. Truncates are less than 1% of the laddis
- * mix so this probably isn't worth the trouble to optimize.
- */
- if (mp->m_flags & XFS_MOUNT_WSYNC)
- xfs_trans_set_sync(tp);
code = xfs_trans_commit(tp, 0);
- xfs_iunlock(ip, lock_flags);
/*
* Release any dquot(s) the inode had kept before chown.
@@ -1272,8 +1280,6 @@ xfs_ioctl_setattr(
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(pdqp);
xfs_trans_cancel(tp, 0);
- if (lock_flags)
- xfs_iunlock(ip, lock_flags);
return code;
}
--
2.0.0
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