xfs: more sensible inode refcounting for ialloc

Currently we return iodes from xfs_ialloc with just a single reference held.
But we need two references, as one is dropped during transaction commit and
the second needs to be transfered to the VFS.  Change xfs_ialloc to use
xfs_iget plus xfs_trans_ijoin_ref to grab two references to the inode,
and remove the now superflous IHOLD calls from all callers.  This also
greatly simplifies the error handling in xfs_create and also allow to remove
xfs_trans_iget as no other callers are left.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-02-13 13:26:42 +00:00 committed by Alex Elder
parent 1050c71e29
commit ec3ba85f40
5 changed files with 20 additions and 79 deletions

View File

@ -1229,13 +1229,6 @@ xfs_qm_qino_alloc(
return error;
}
/*
* Keep an extra reference to this quota inode. This inode is
* locked exclusively and joined to the transaction already.
*/
ASSERT(xfs_isilocked(*ip, XFS_ILOCK_EXCL));
IHOLD(*ip);
/*
* Make the changes in the superblock, and log those too.
* sbfields arg may contain fields other than *QUOTINO;

View File

@ -1016,8 +1016,8 @@ xfs_ialloc(
* This is because we're setting fields here we need
* to prevent others from looking at until we're done.
*/
error = xfs_trans_iget(tp->t_mountp, tp, ino,
XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
error = xfs_iget(tp->t_mountp, tp, ino, XFS_IGET_CREATE,
XFS_ILOCK_EXCL, &ip);
if (error)
return error;
ASSERT(ip != NULL);
@ -1166,6 +1166,7 @@ xfs_ialloc(
/*
* Log the new values stuffed into the inode.
*/
xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
xfs_trans_log_inode(tp, ip, flags);
/* now that we have an i_mode we can setup inode ops and unlock */

View File

@ -469,8 +469,6 @@ void xfs_trans_inode_buf(xfs_trans_t *, struct xfs_buf *);
void xfs_trans_stale_inode_buf(xfs_trans_t *, struct xfs_buf *);
void xfs_trans_dquot_buf(xfs_trans_t *, struct xfs_buf *, uint);
void xfs_trans_inode_alloc_buf(xfs_trans_t *, struct xfs_buf *);
int xfs_trans_iget(struct xfs_mount *, xfs_trans_t *,
xfs_ino_t , uint, uint, struct xfs_inode **);
void xfs_trans_ichgtime(struct xfs_trans *, struct xfs_inode *, int);
void xfs_trans_ijoin_ref(struct xfs_trans *, struct xfs_inode *, uint);
void xfs_trans_ijoin(struct xfs_trans *, struct xfs_inode *);

View File

@ -43,28 +43,6 @@ xfs_trans_inode_broot_debug(
#define xfs_trans_inode_broot_debug(ip)
#endif
/*
* Get an inode and join it to the transaction.
*/
int
xfs_trans_iget(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_ino_t ino,
uint flags,
uint lock_flags,
xfs_inode_t **ipp)
{
int error;
error = xfs_iget(mp, tp, ino, flags, lock_flags, ipp);
if (!error && tp) {
xfs_trans_ijoin(tp, *ipp);
(*ipp)->i_itemp->ili_lock_flags = lock_flags;
}
return error;
}
/*
* Add a locked inode to the transaction.
*

View File

@ -1310,7 +1310,7 @@ xfs_create(
error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
if (error)
goto std_return;
return error;
if (is_dir) {
rdev = 0;
@ -1389,12 +1389,6 @@ xfs_create(
goto out_trans_abort;
}
/*
* At this point, we've gotten a newly allocated inode.
* It is locked (and joined to the transaction).
*/
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
/*
* Now we join the directory inode to the transaction. We do not do it
* earlier because xfs_dir_ialloc might commit the previous transaction
@ -1440,22 +1434,13 @@ xfs_create(
*/
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
/*
* xfs_trans_commit normally decrements the vnode ref count
* when it unlocks the inode. Since we want to return the
* vnode to the caller, we bump the vnode ref count now.
*/
IHOLD(ip);
error = xfs_bmap_finish(&tp, &free_list, &committed);
if (error)
goto out_abort_rele;
goto out_bmap_cancel;
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
if (error) {
IRELE(ip);
goto out_dqrele;
}
if (error)
goto out_release_inode;
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(gdqp);
@ -1469,27 +1454,21 @@ xfs_create(
cancel_flags |= XFS_TRANS_ABORT;
out_trans_cancel:
xfs_trans_cancel(tp, cancel_flags);
out_dqrele:
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(gdqp);
if (unlock_dp_on_error)
xfs_iunlock(dp, XFS_ILOCK_EXCL);
std_return:
return error;
out_abort_rele:
out_release_inode:
/*
* Wait until after the current transaction is aborted to
* release the inode. This prevents recursive transactions
* and deadlocks from xfs_inactive.
*/
xfs_bmap_cancel(&free_list);
cancel_flags |= XFS_TRANS_ABORT;
xfs_trans_cancel(tp, cancel_flags);
IRELE(ip);
unlock_dp_on_error = B_FALSE;
goto out_dqrele;
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
@ -2114,9 +2093,8 @@ xfs_symlink(
XFS_BMAPI_WRITE | XFS_BMAPI_METADATA,
&first_block, resblks, mval, &nmaps,
&free_list);
if (error) {
goto error1;
}
if (error)
goto error2;
if (resblks)
resblks -= fs_blocks;
@ -2148,7 +2126,7 @@ xfs_symlink(
error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
&first_block, &free_list, resblks);
if (error)
goto error1;
goto error2;
xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
@ -2161,13 +2139,6 @@ xfs_symlink(
xfs_trans_set_sync(tp);
}
/*
* xfs_trans_commit normally decrements the vnode ref count
* when it unlocks the inode. Since we want to return the
* vnode to the caller, we bump the vnode ref count now.
*/
IHOLD(ip);
error = xfs_bmap_finish(&tp, &free_list, &committed);
if (error) {
goto error2;