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Btrfs: Add a thread pool just for submit_bio

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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>
This commit is contained in:
Chris Mason
2008-06-12 14:46:17 -04:00
parent df5b5520b2
commit 1cc127b5d1
3 changed files with 10 additions and 1 deletions
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4
fs/btrfs/disk-io.c
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@@ -1233,8 +1233,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
* cannot dynamically grow.
*/
btrfs_init_workers(&fs_info->workers, fs_info->thread_pool_size);
btrfs_init_workers(&fs_info->submit_workers, fs_info->thread_pool_size);
btrfs_init_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
btrfs_start_workers(&fs_info->workers, 1);
btrfs_start_workers(&fs_info->submit_workers, 1);
btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
@@ -1343,6 +1345,7 @@ fail_sb_buffer:
extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
btrfs_stop_workers(&fs_info->workers);
btrfs_stop_workers(&fs_info->endio_workers);
btrfs_stop_workers(&fs_info->submit_workers);
fail_iput:
iput(fs_info->btree_inode);
fail:
@@ -1597,6 +1600,7 @@ int close_ctree(struct btrfs_root *root)
btrfs_stop_workers(&fs_info->workers);
btrfs_stop_workers(&fs_info->endio_workers);
btrfs_stop_workers(&fs_info->submit_workers);
iput(fs_info->btree_inode);
#if 0