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Btrfs: async delayed refs

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Delayed extent operations are triggered during transaction commits.
The goal is to queue up a healthly batch of changes to the extent
allocation tree and run through them in bulk.

This farms them off to async helper threads.  The goal is to have the
bulk of the delayed operations being done in the background, but this is
also important to limit our stack footprint.

Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Chris Mason
2014-05-22 16:18:52 -07:00
parent 40f765805f
commit a79b7d4b3e
5 changed files with 107 additions and 3 deletions
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fs/btrfs/inode.c
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@@ -2678,6 +2678,7 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
trans = NULL;
goto out_unlock;
}
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags))