From ec3ba85f4083d10e32fe58b46db02d78ef71f6b8 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Sun, 13 Feb 2011 13:26:42 +0000
Subject: [PATCH] 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>
---
fs/xfs/quota/xfs_qm.c | 7 -----
fs/xfs/xfs_inode.c | 5 ++--
fs/xfs/xfs_trans.h | 2 --
fs/xfs/xfs_trans_inode.c | 22 ---------------
fs/xfs/xfs_vnodeops.c | 61 +++++++++++-----------------------------
5 files changed, 19 insertions(+), 78 deletions(-)
diff --git a/fs/xfs/quota/xfs_qm.c b/fs/xfs/quota/xfs_qm.c
index 206a2815ced6..f517963aec07 100644
--- a/fs/xfs/quota/xfs_qm.c
+++ b/fs/xfs/quota/xfs_qm.c
@@ -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;
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index be7cf625421f..c39278b6c871 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -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 */
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index c2042b736b81..06a9759b6352 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -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 *);
diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c
index ccb34532768b..16084d8ea231 100644
--- a/fs/xfs/xfs_trans_inode.c
+++ b/fs/xfs/xfs_trans_inode.c
@@ -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.
*
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index d8e6f8cd6f0c..258d4f98eb9b 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -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:
+ out_release_inode:
+ /*
+ * Wait until after the current transaction is aborted to
+ * release the inode. This prevents recursive transactions
+ * and deadlocks from xfs_inactive.
+ */
+ if (ip)
+ IRELE(ip);
+
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:
- /*
- * 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;
}
#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;
--
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