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| author | Nikolay Borisov <nborisov@suse.com> | 2019-05-07 09:19:22 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-07-01 13:34:59 +0200 |
| commit | ffa87214c1100c7ea38e85a3cf981d0d47b1c744 (patch) | |
| tree | 6f8e12740a03383376cb4321fef14eeeeb3034e6 /fs/btrfs/ordered-data.c | |
| parent | btrfs: remove the incorrect comment on RO fs when btrfs_run_delalloc_range() ... (diff) | |
| download | linux-ffa87214c1100c7ea38e85a3cf981d0d47b1c744.tar.xz linux-ffa87214c1100c7ea38e85a3cf981d0d47b1c744.zip | |
btrfs: add new helper btrfs_lock_and_flush_ordered_range
There is a certain idiom used in multiple places in btrfs' codebase,
dealing with flushing an ordered range. Factor this in a separate
function that can be reused. Future patches will replace the existing
code with that function.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ordered-data.c')
| -rw-r--r-- | fs/btrfs/ordered-data.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index 52889da69113..37401cc04a6b 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -962,6 +962,39 @@ out: return index; } +/* + * btrfs_flush_ordered_range - Lock the passed range and ensures all pending + * ordered extents in it are run to completion. + * + * @tree: IO tree used for locking out other users of the range + * @inode: Inode whose ordered tree is to be searched + * @start: Beginning of range to flush + * @end: Last byte of range to lock + * @cached_state: If passed, will return the extent state responsible for the + * locked range. It's the caller's responsibility to free the cached state. + * + * This function always returns with the given range locked, ensuring after it's + * called no order extent can be pending. + */ +void btrfs_lock_and_flush_ordered_range(struct extent_io_tree *tree, + struct btrfs_inode *inode, u64 start, + u64 end, + struct extent_state **cached_state) +{ + struct btrfs_ordered_extent *ordered; + + while (1) { + lock_extent_bits(tree, start, end, cached_state); + ordered = btrfs_lookup_ordered_range(inode, start, + end - start + 1); + if (!ordered) + break; + unlock_extent_cached(tree, start, end, cached_state); + btrfs_start_ordered_extent(&inode->vfs_inode, ordered, 1); + btrfs_put_ordered_extent(ordered); + } +} + int __init ordered_data_init(void) { btrfs_ordered_extent_cache = kmem_cache_create("btrfs_ordered_extent", |