Btrfs: fix wrong skipping compression for an inode

If a file's compression ratios is bad, we will set NOCOMPRESS
flag for it, and it will skip compression for that inode next time.

However, if we remount fs to COMPRESS_FORCE, it still should try
if we could compress pages for that inode, this patch fix wrong
check for this problem.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 177508a..48a2886 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -348,6 +348,23 @@ static noinline int add_async_extent(struct async_cow *cow,
        return 0;
 }
 
+static inline int inode_need_compress(struct inode *inode)
+{
+       struct btrfs_root *root = BTRFS_I(inode)->root;
+
+       /* force compress */
+       if (btrfs_test_opt(root, FORCE_COMPRESS))
+               return 1;
+       /* bad compression ratios */
+       if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
+               return 0;
+       if (btrfs_test_opt(root, COMPRESS) ||
+           BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS ||
+           BTRFS_I(inode)->force_compress)
+               return 1;
+       return 0;
+}
+
 /*
  * we create compressed extents in two phases.  The first
  * phase compresses a range of pages that have already been
@@ -444,10 +461,7 @@ again:
         * inode has not been flagged as nocompress.  This flag can
         * change at any time if we discover bad compression ratios.
         */
-       if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) &&
-           (btrfs_test_opt(root, COMPRESS) ||
-            (BTRFS_I(inode)->force_compress) ||
-            (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) {
+       if (inode_need_compress(inode)) {
                WARN_ON(pages);
                pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
                if (!pages) {
@@ -1094,7 +1108,8 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
                async_cow->locked_page = locked_page;
                async_cow->start = start;
 
-               if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
+               if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS &&
+                   !btrfs_test_opt(root, FORCE_COMPRESS))
                        cur_end = end;
                else
                        cur_end = min(end, start + 512 * 1024 - 1);