diff options
| author | Chris Mason | 2008-06-12 20:46:17 +0200 |
|---|---|---|
| committer | Chris Mason | 2008-09-25 17:04:03 +0200 |
| commit | 1cc127b5d1b71453091859301de4a7dd6ee96fa8 (patch) | |
| tree | cb1280305a04eb5e6838f91781e668e3bdeed208 /fs/btrfs/ctree.h | |
| parent | BTRFS_IOC_TRANS_START should be privilegued (diff) | |
| download | kernel-qcow2-linux-1cc127b5d1b71453091859301de4a7dd6ee96fa8.tar.gz kernel-qcow2-linux-1cc127b5d1b71453091859301de4a7dd6ee96fa8.tar.xz kernel-qcow2-linux-1cc127b5d1b71453091859301de4a7dd6ee96fa8.zip | |
Btrfs: Add a thread pool just for submit_bio
If a bio submission is after a lock holder waiting for the bio
on the work queue, it is possible to deadlock. Move the bios
into their own pool.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 181c81d29897..dcea9d706d9b 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -529,9 +529,13 @@ struct btrfs_fs_info { * can run with FS locks held, and the writers may be waiting for * those locks. We don't want ordering in the pending list to cause * deadlocks, and so the two are serviced separately. + * + * A third pool does submit_bio to avoid deadlocking with the other + * two */ struct btrfs_workers workers; struct btrfs_workers endio_workers; + struct btrfs_workers submit_workers; int thread_pool_size; #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |