Merge branch 'for-linus' into for-4.12/block

We've added a considerable amount of fixes for stalls and issues
with the blk-mq scheduling in the 4.11 series since forking
off the for-4.12/block branch. We need to do improvements on
top of that for 4.12, so pull in the previous fixes to make
our lives easier going forward.

Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c40060cc481f..231503935652 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -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;
 }