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xfs: split out inode walk inode grabbing

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When doing read side inode cache walks, the code to validate and
grab an inode is common to all callers. Split it out of the execute
callbacks in preparation for batching lookups. Similarly, split out
the inode reference dropping from the execute callbacks into the
main lookup look to be symmetric with the grab.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-09-28 12:28:06 +10:00 committed by Alex Elder
parent 65d0f20533
commit e13de955ca
2 changed files with 34 additions and 54 deletions
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79
fs/xfs/linux-2.6/xfs_sync.c
View File

@ -39,6 +39,33 @@
#include <linux/kthread.h>
#include <linux/freezer.h>
STATIC int
xfs_inode_ag_walk_grab(
struct xfs_inode *ip)
{
struct inode *inode = VFS_I(ip);
/* nothing to sync during shutdown */
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return EFSCORRUPTED;
/* avoid new or reclaimable inodes. Leave for reclaim code to flush */
if (xfs_iflags_test(ip, XFS_INEW | XFS_IRECLAIMABLE | XFS_IRECLAIM))
return ENOENT;
/* If we can't grab the inode, it must on it's way to reclaim. */
if (!igrab(inode))
return ENOENT;
if (is_bad_inode(inode)) {
IRELE(ip);
return ENOENT;
}
/* inode is valid */
return 0;
}
STATIC int
xfs_inode_ag_walk(
@ -80,8 +107,14 @@ restart:
if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
done = 1;
/* execute releases pag->pag_ici_lock */
if (xfs_inode_ag_walk_grab(ip)) {
read_unlock(&pag->pag_ici_lock);
continue;
}
read_unlock(&pag->pag_ici_lock);
error = execute(ip, pag, flags);
IRELE(ip);
if (error == EAGAIN) {
skipped++;
continue;
@ -128,40 +161,6 @@ xfs_inode_ag_iterator(
return XFS_ERROR(last_error);
}
/* must be called with pag_ici_lock held and releases it */
int
xfs_sync_inode_valid(
struct xfs_inode *ip,
struct xfs_perag *pag)
{
struct inode *inode = VFS_I(ip);
int error = EFSCORRUPTED;
/* nothing to sync during shutdown */
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
goto out_unlock;
/* avoid new or reclaimable inodes. Leave for reclaim code to flush */
error = ENOENT;
if (xfs_iflags_test(ip, XFS_INEW | XFS_IRECLAIMABLE | XFS_IRECLAIM))
goto out_unlock;
/* If we can't grab the inode, it must on it's way to reclaim. */
if (!igrab(inode))
goto out_unlock;
if (is_bad_inode(inode)) {
IRELE(ip);
goto out_unlock;
}
/* inode is valid */
error = 0;
out_unlock:
read_unlock(&pag->pag_ici_lock);
return error;
}
STATIC int
xfs_sync_inode_data(
struct xfs_inode *ip,
@ -172,10 +171,6 @@ xfs_sync_inode_data(
struct address_space *mapping = inode->i_mapping;
int error = 0;
error = xfs_sync_inode_valid(ip, pag);
if (error)
return error;
if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
goto out_wait;
@ -192,7 +187,6 @@ xfs_sync_inode_data(
out_wait:
if (flags & SYNC_WAIT)
xfs_ioend_wait(ip);
IRELE(ip);
return error;
}
@ -204,10 +198,6 @@ xfs_sync_inode_attr(
{
int error = 0;
error = xfs_sync_inode_valid(ip, pag);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_SHARED);
if (xfs_inode_clean(ip))
goto out_unlock;
@ -226,7 +216,6 @@ xfs_sync_inode_attr(
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_SHARED);
IRELE(ip);
return error;
}

9
fs/xfs/quota/xfs_qm_syscalls.c
View File

@ -875,21 +875,14 @@ xfs_dqrele_inode(
struct xfs_perag *pag,
int flags)
{
int error;
/* skip quota inodes */
if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
ip == ip->i_mount->m_quotainfo->qi_gquotaip) {
ASSERT(ip->i_udquot == NULL);
ASSERT(ip->i_gdquot == NULL);
read_unlock(&pag->pag_ici_lock);
return 0;
}
error = xfs_sync_inode_valid(ip, pag);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
xfs_qm_dqrele(ip->i_udquot);
@ -900,8 +893,6 @@ xfs_dqrele_inode(
ip->i_gdquot = NULL;
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
IRELE(ip);
return 0;
}