AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

[XFS] kill usesless IHOLD calls in xfs_remove and xfs_rmdir

Browse Source 
The VFS always has an inode reference when we call these functions. So we
only need to grab a signle reference to each inode that's joined to a
transaction - all the other bumping and dropping is as useless as the
comments describing the IRIX semantics.

SGI-PV: 976035
SGI-Modid: xfs-linux-melb:xfs-kern:30912a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
Christoph Hellwig 2008-04-22 17:34:24 +10:00 committed by Lachlan McIlroy
parent 82dab941a1
commit 5df78e73d3
1 changed files with 4 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
fs/xfs/xfs_vnodeops.c
View File

@ -2162,20 +2162,6 @@ xfs_remove(
return error;
}
/*
* We need to get a reference to ip before we get our log
* reservation. The reason for this is that we cannot call
* xfs_iget for an inode for which we do not have a reference
* once we've acquired a log reservation. This is because the
* inode we are trying to get might be in xfs_inactive going
* for a log reservation. Since we'll have to wait for the
* inactive code to complete before returning from xfs_iget,
* we need to make sure that we don't have log space reserved
* when we call xfs_iget. Instead we get an unlocked reference
* to the inode before getting our log reservation.
*/
IHOLD(ip);
xfs_itrace_entry(ip);
xfs_itrace_ref(ip);
@ -2184,7 +2170,6 @@ xfs_remove(
error = XFS_QM_DQATTACH(mp, ip, 0);
if (error) {
REMOVE_DEBUG_TRACE(__LINE__);
IRELE(ip);
goto std_return;
}
@ -2211,7 +2196,6 @@ xfs_remove(
ASSERT(error != ENOSPC);
REMOVE_DEBUG_TRACE(__LINE__);
xfs_trans_cancel(tp, 0);
IRELE(ip);
return error;
}
@ -2219,7 +2203,6 @@ xfs_remove(
if (error) {
REMOVE_DEBUG_TRACE(__LINE__);
xfs_trans_cancel(tp, cancel_flags);
IRELE(ip);
goto std_return;
}
@ -2227,6 +2210,7 @@ xfs_remove(
* At this point, we've gotten both the directory and the entry
* inodes locked.
*/
IHOLD(ip);
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
IHOLD(dp);
@ -2259,12 +2243,6 @@ xfs_remove(
*/
link_zero = (ip)->i_d.di_nlink==0;
/*
* Take an extra ref on the inode so that it doesn't
* go to xfs_inactive() from within the commit.
*/
IHOLD(ip);
/*
* If this is a synchronous mount, make sure that the
* remove transaction goes to disk before returning to
@ -2281,10 +2259,8 @@ xfs_remove(
}
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
if (error) {
IRELE(ip);
if (error)
goto std_return;
}
/*
* If we are using filestreams, kill the stream association.
@ -2296,7 +2272,6 @@ xfs_remove(
xfs_filestream_deassociate(ip);
xfs_itrace_exit(ip);
IRELE(ip);
/* Fall through to std_return with error = 0 */
std_return:
@ -2325,8 +2300,6 @@ xfs_remove(
cancel_flags |= XFS_TRANS_ABORT;
xfs_trans_cancel(tp, cancel_flags);
IRELE(ip);
goto std_return;
}
@ -2698,7 +2671,6 @@ xfs_rmdir(
struct xfs_name *name,
xfs_inode_t *cdp)
{
bhv_vnode_t *dir_vp = XFS_ITOV(dp);
xfs_mount_t *mp = dp->i_mount;
xfs_trans_t *tp;
int error;
@ -2723,20 +2695,6 @@ xfs_rmdir(
return XFS_ERROR(error);
}
/*
* We need to get a reference to cdp before we get our log
* reservation. The reason for this is that we cannot call
* xfs_iget for an inode for which we do not have a reference
* once we've acquired a log reservation. This is because the
* inode we are trying to get might be in xfs_inactive going
* for a log reservation. Since we'll have to wait for the
* inactive code to complete before returning from xfs_iget,
* we need to make sure that we don't have log space reserved
* when we call xfs_iget. Instead we get an unlocked reference
* to the inode before getting our log reservation.
*/
IHOLD(cdp);
/*
* Get the dquots for the inodes.
*/
@ -2744,7 +2702,6 @@ xfs_rmdir(
if (!error)
error = XFS_QM_DQATTACH(mp, cdp, 0);
if (error) {
IRELE(cdp);
REMOVE_DEBUG_TRACE(__LINE__);
goto std_return;
}
@ -2771,7 +2728,6 @@ xfs_rmdir(
if (error) {
ASSERT(error != ENOSPC);
cancel_flags = 0;
IRELE(cdp);
goto error_return;
}
XFS_BMAP_INIT(&free_list, &first_block);
@ -2785,14 +2741,13 @@ xfs_rmdir(
error = xfs_lock_dir_and_entry(dp, cdp);
if (error) {
xfs_trans_cancel(tp, cancel_flags);
IRELE(cdp);
goto std_return;
}
IHOLD(dp);
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
VN_HOLD(dir_vp);
xfs_itrace_ref(cdp);
IHOLD(cdp);
xfs_trans_ijoin(tp, cdp, XFS_ILOCK_EXCL);
ASSERT(cdp->i_d.di_nlink >= 2);
@ -2845,12 +2800,6 @@ xfs_rmdir(
/* Determine these before committing transaction */
last_cdp_link = (cdp)->i_d.di_nlink==0;
/*
* Take an extra ref on the child vnode so that it
* does not go to xfs_inactive() from within the commit.
*/
IHOLD(cdp);
/*
* If this is a synchronous mount, make sure that the
* rmdir transaction goes to disk before returning to
@ -2865,19 +2814,15 @@ xfs_rmdir(
xfs_bmap_cancel(&free_list);
xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
XFS_TRANS_ABORT));
IRELE(cdp);
goto std_return;
}
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
if (error) {
IRELE(cdp);
goto std_return;
}
IRELE(cdp);
/* Fall through to std_return with error = 0 or the errno
* from xfs_trans_commit. */
std_return: