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| author | Dave Chinner <dchinner@redhat.com> | 2010-09-24 18:40:15 +1000 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2010-10-18 15:07:52 -0500 |
| commit | 65d0f20533c503b50bd5e7e86434512af7761eea (patch) | |
| tree | 0e04d6898fc0c729886067a3daf79b10a7a19992 /fs/xfs/xfs_mount.c | |
| parent | 69d6cc76cff3573ceefda178b75e20878866fdc3 (diff) | |
| download | linux-65d0f20533c503b50bd5e7e86434512af7761eea.tar.gz linux-65d0f20533c503b50bd5e7e86434512af7761eea.tar.bz2 linux-65d0f20533c503b50bd5e7e86434512af7761eea.zip | |
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.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 912101d280bf..d66e87c7c3a6 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) { |