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authorChristoph Hellwig <hch@lst.de>2017-02-08 01:06:57 +0300
committerDarrick J. Wong <darrick.wong@oracle.com>2017-02-09 21:50:25 +0300
commitebf55872616c7d4754db5a318591a72a8d5e6896 (patch)
treefd88d14b7765f0834273807a14ee931519029438 /fs/xfs/xfs_mount.h
parent5e30c23d13919a718b22d4921dc5c0accc59da27 (diff)
downloadlinux-ebf55872616c7d4754db5a318591a72a8d5e6896.tar.xz
xfs: improve handling of busy extents in the low-level allocator
Currently we force the log and simply try again if we hit a busy extent, but especially with online discard enabled it might take a while after the log force for the busy extents to disappear, and we might have already completed our second pass. So instead we add a new waitqueue and a generation counter to the pag structure so that we can do wakeups once we've removed busy extents, and we replace the single retry with an unconditional one - after all we hold the AGF buffer lock, so no other allocations or frees can be racing with us in this AG. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/xfs_mount.h')
-rw-r--r--fs/xfs/xfs_mount.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 7f351f706b7a..20e2981a4aec 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -384,6 +384,8 @@ typedef struct xfs_perag {
xfs_agino_t pagl_rightrec;
spinlock_t pagb_lock; /* lock for pagb_tree */
struct rb_root pagb_tree; /* ordered tree of busy extents */
+ unsigned int pagb_gen; /* generation count for pagb_tree */
+ wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */
atomic_t pagf_fstrms; /* # of filestreams active in this AG */