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authorDave Chinner <dchinner@redhat.com>2010-09-24 18:40:15 +1000
committerAlex Elder <aelder@sgi.com>2010-10-18 15:07:52 -0500
commit65d0f20533c503b50bd5e7e86434512af7761eea (patch)
tree0e04d6898fc0c729886067a3daf79b10a7a19992 /fs/xfs/xfs_mount.c
parent69d6cc76cff3573ceefda178b75e20878866fdc3 (diff)
downloadop-kernel-dev-65d0f20533c503b50bd5e7e86434512af7761eea.zip
op-kernel-dev-65d0f20533c503b50bd5e7e86434512af7761eea.tar.gz
xfs: split inode AG walking into separate code for reclaim
The reclaim walk requires different locking and has a slightly different walk algorithm, so separate it out so that it can be optimised separately. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_mount.c')
-rw-r--r--fs/xfs/xfs_mount.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 912101d..d66e87c 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -219,6 +219,32 @@ xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno)
return pag;
}
+/*
+ * search from @first to find the next perag with the given tag set.
+ */
+struct xfs_perag *
+xfs_perag_get_tag(
+ struct xfs_mount *mp,
+ xfs_agnumber_t first,
+ int tag)
+{
+ struct xfs_perag *pag;
+ int found;
+ int ref;
+
+ rcu_read_lock();
+ found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
+ (void **)&pag, first, 1, tag);
+ if (found <= 0) {
+ rcu_read_unlock();
+ return NULL;
+ }
+ ref = atomic_inc_return(&pag->pag_ref);
+ rcu_read_unlock();
+ trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
+ return pag;
+}
+
void
xfs_perag_put(struct xfs_perag *pag)
{
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