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Merge branch 'for-linus-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

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Pull btrfs fixes from Chris Mason:
 "Zygo tracked down a very old bug with inline compressed extents.

  I didn't tag this one for stable because I want to do individual
  tested backports. It's a little tricky and I'd rather do some extra
  testing on it along the way"

* 'for-linus-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: add missing memset while reading compressed inline extents
  Btrfs: fix regression in lock_delalloc_pages
  btrfs: remove btrfs_err_str function from uapi/linux/btrfs.h
This commit is contained in:
Linus Torvalds
2017-03-23 11:39:33 -07:00
parent f341d9f08a e1699d2d7b
commit 131fbf4f9c
3 changed files with 16 additions and 28 deletions
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14
fs/btrfs/inode.c
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@@ -6709,6 +6709,20 @@ static noinline int uncompress_inline(struct btrfs_path *path,
max_size = min_t(unsigned long, PAGE_SIZE, max_size);
ret = btrfs_decompress(compress_type, tmp, page,
extent_offset, inline_size, max_size);
/*
* decompression code contains a memset to fill in any space between the end
* of the uncompressed data and the end of max_size in case the decompressed
* data ends up shorter than ram_bytes. That doesn't cover the hole between
* the end of an inline extent and the beginning of the next block, so we
* cover that region here.
*/
if (max_size + pg_offset < PAGE_SIZE) {
char *map = kmap(page);
memset(map + pg_offset + max_size, 0, PAGE_SIZE - max_size - pg_offset);
kunmap(page);
}
kfree(tmp);
return ret;
}