xfs: split out inode walk inode grabbing
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>
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@ -39,6 +39,33 @@
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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STATIC int
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xfs_inode_ag_walk_grab(
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struct xfs_inode *ip)
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{
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struct inode *inode = VFS_I(ip);
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/* nothing to sync during shutdown */
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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return EFSCORRUPTED;
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/* avoid new or reclaimable inodes. Leave for reclaim code to flush */
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if (xfs_iflags_test(ip, XFS_INEW | XFS_IRECLAIMABLE | XFS_IRECLAIM))
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return ENOENT;
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/* If we can't grab the inode, it must on it's way to reclaim. */
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if (!igrab(inode))
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return ENOENT;
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if (is_bad_inode(inode)) {
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IRELE(ip);
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return ENOENT;
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}
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/* inode is valid */
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return 0;
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}
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STATIC int
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xfs_inode_ag_walk(
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@ -80,8 +107,14 @@ restart:
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if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
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done = 1;
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/* execute releases pag->pag_ici_lock */
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if (xfs_inode_ag_walk_grab(ip)) {
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read_unlock(&pag->pag_ici_lock);
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continue;
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}
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read_unlock(&pag->pag_ici_lock);
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error = execute(ip, pag, flags);
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IRELE(ip);
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if (error == EAGAIN) {
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skipped++;
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continue;
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@ -128,40 +161,6 @@ xfs_inode_ag_iterator(
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return XFS_ERROR(last_error);
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}
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/* must be called with pag_ici_lock held and releases it */
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int
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xfs_sync_inode_valid(
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struct xfs_inode *ip,
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struct xfs_perag *pag)
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{
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struct inode *inode = VFS_I(ip);
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int error = EFSCORRUPTED;
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/* nothing to sync during shutdown */
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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goto out_unlock;
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/* avoid new or reclaimable inodes. Leave for reclaim code to flush */
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error = ENOENT;
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if (xfs_iflags_test(ip, XFS_INEW | XFS_IRECLAIMABLE | XFS_IRECLAIM))
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goto out_unlock;
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/* If we can't grab the inode, it must on it's way to reclaim. */
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if (!igrab(inode))
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goto out_unlock;
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if (is_bad_inode(inode)) {
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IRELE(ip);
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goto out_unlock;
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}
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/* inode is valid */
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error = 0;
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out_unlock:
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read_unlock(&pag->pag_ici_lock);
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return error;
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}
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STATIC int
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xfs_sync_inode_data(
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struct xfs_inode *ip,
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@ -172,10 +171,6 @@ xfs_sync_inode_data(
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struct address_space *mapping = inode->i_mapping;
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int error = 0;
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error = xfs_sync_inode_valid(ip, pag);
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if (error)
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return error;
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if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
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goto out_wait;
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@ -192,7 +187,6 @@ xfs_sync_inode_data(
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out_wait:
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if (flags & SYNC_WAIT)
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xfs_ioend_wait(ip);
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IRELE(ip);
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return error;
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}
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@ -204,10 +198,6 @@ xfs_sync_inode_attr(
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{
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int error = 0;
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error = xfs_sync_inode_valid(ip, pag);
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if (error)
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return error;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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if (xfs_inode_clean(ip))
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goto out_unlock;
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@ -226,7 +216,6 @@ xfs_sync_inode_attr(
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out_unlock:
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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IRELE(ip);
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return error;
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}
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@ -875,21 +875,14 @@ xfs_dqrele_inode(
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struct xfs_perag *pag,
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int flags)
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{
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int error;
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/* skip quota inodes */
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if (ip == ip->i_mount->m_quotainfo->qi_uquotaip ||
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ip == ip->i_mount->m_quotainfo->qi_gquotaip) {
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ASSERT(ip->i_udquot == NULL);
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ASSERT(ip->i_gdquot == NULL);
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read_unlock(&pag->pag_ici_lock);
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return 0;
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}
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error = xfs_sync_inode_valid(ip, pag);
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if (error)
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return error;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
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xfs_qm_dqrele(ip->i_udquot);
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ip->i_gdquot = NULL;
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}
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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IRELE(ip);
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return 0;
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}
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