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| author | Goldwyn Rodrigues <rgoldwyn@suse.com> | 2017-10-16 12:43:21 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-10-30 12:28:01 +0100 |
| commit | 79f015f216539dfdf0d3ef0b3bbb9dc7754364cd (patch) | |
| tree | 4aae4ca874dbb7a4f485ff80d2539b169e8e9a60 /fs/btrfs | |
| parent | btrfs: use BLK_STS defines where needed (diff) | |
| download | linux-79f015f216539dfdf0d3ef0b3bbb9dc7754364cd.tar.xz linux-79f015f216539dfdf0d3ef0b3bbb9dc7754364cd.zip | |
btrfs: cleanup extent locking sequence
Code cleanup for better understanding:
Variable needs_unlock to be called extent_locked to show state as
opposed to action. Changed the type to int, to reduce code in the
critical path.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/file.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index d3c1725f03e4..4de174b664ff 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1590,7 +1590,6 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, int ret = 0; bool only_release_metadata = false; bool force_page_uptodate = false; - bool need_unlock; nrptrs = min(DIV_ROUND_UP(iov_iter_count(i), PAGE_SIZE), PAGE_SIZE / (sizeof(struct page *))); @@ -1613,6 +1612,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, size_t copied; size_t dirty_sectors; size_t num_sectors; + int extents_locked; WARN_ON(num_pages > nrptrs); @@ -1669,7 +1669,6 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, } release_bytes = reserve_bytes; - need_unlock = false; again: /* * This is going to setup the pages array with the number of @@ -1682,16 +1681,15 @@ again: if (ret) break; - ret = lock_and_cleanup_extent_if_need(BTRFS_I(inode), pages, + extents_locked = lock_and_cleanup_extent_if_need( + BTRFS_I(inode), pages, num_pages, pos, write_bytes, &lockstart, &lockend, &cached_state); - if (ret < 0) { - if (ret == -EAGAIN) + if (extents_locked < 0) { + if (extents_locked == -EAGAIN) goto again; + ret = extents_locked; break; - } else if (ret > 0) { - need_unlock = true; - ret = 0; } copied = btrfs_copy_from_user(pos, write_bytes, pages, i); @@ -1756,7 +1754,7 @@ again: if (copied > 0) ret = btrfs_dirty_pages(inode, pages, dirty_pages, pos, copied, NULL); - if (need_unlock) + if (extents_locked) unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, &cached_state, GFP_NOFS); |