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for-4.18-rc5-tag

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Merge tag 'for-4.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fix from David Sterba:
 "A fix of a corruption regarding fsync and clone, under some very
  specific conditions explained in the patch.

  The fix is marked for stable 3.16+ so I'd like to get it merged now
  given the impact"

* tag 'for-4.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  Btrfs: fix file data corruption after cloning a range and fsync
This commit is contained in:
Linus Torvalds 2018-07-21 16:42:03 -07:00
commit 55b636b419
1 changed files with 5 additions and 2 deletions
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7
fs/btrfs/extent_io.c
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@ -4238,8 +4238,9 @@ int try_release_extent_mapping(struct page *page, gfp_t mask)
struct extent_map *em;
u64 start = page_offset(page);
u64 end = start + PAGE_SIZE - 1;
struct extent_io_tree *tree = &BTRFS_I(page->mapping->host)->io_tree;
struct extent_map_tree *map = &BTRFS_I(page->mapping->host)->extent_tree;
struct btrfs_inode *btrfs_inode = BTRFS_I(page->mapping->host);
struct extent_io_tree *tree = &btrfs_inode->io_tree;
struct extent_map_tree *map = &btrfs_inode->extent_tree;
if (gfpflags_allow_blocking(mask) &&
page->mapping->host->i_size > SZ_16M) {
@ -4262,6 +4263,8 @@ int try_release_extent_mapping(struct page *page, gfp_t mask)
extent_map_end(em) - 1,
EXTENT_LOCKED | EXTENT_WRITEBACK,
0, NULL)) {
set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
&btrfs_inode->runtime_flags);
remove_extent_mapping(map, em);
/* once for the rb tree */
free_extent_map(em);