diff options
| author | Christoph Hellwig <hch@lst.de> | 2017-02-08 01:06:57 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-02-09 21:50:25 +0300 |
| commit | ebf55872616c7d4754db5a318591a72a8d5e6896 (patch) | |
| tree | fd88d14b7765f0834273807a14ee931519029438 /fs/xfs/xfs_mount.c | |
| parent | 5e30c23d13919a718b22d4921dc5c0accc59da27 (diff) | |
| download | linux-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.c')
| -rw-r--r-- | fs/xfs/xfs_mount.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 1f1e4ae44150..566eb79666ad 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -45,6 +45,7 @@ #include "xfs_rmap_btree.h" #include "xfs_refcount_btree.h" #include "xfs_reflink.h" +#include "xfs_extent_busy.h" static DEFINE_MUTEX(xfs_uuid_table_mutex); @@ -213,6 +214,7 @@ xfs_initialize_perag( INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); if (xfs_buf_hash_init(pag)) goto out_free_pag; + init_waitqueue_head(&pag->pagb_wait); if (radix_tree_preload(GFP_NOFS)) goto out_hash_destroy; @@ -1079,6 +1081,12 @@ xfs_unmountfs( xfs_log_force(mp, XFS_LOG_SYNC); /* + * Wait for all busy extents to be freed, including completion of + * any discard operation. + */ + xfs_extent_busy_wait_all(mp); + + /* * We now need to tell the world we are unmounting. This will allow * us to detect that the filesystem is going away and we should error * out anything that we have been retrying in the background. This will |