Btrfs: let the user know space caching is enabled

If you mount -o space_cache, the option will be persistent across mounts, but to
make sure the user knows that they did this, emit a message telling them if they
didn't mount with -o space_cache but the feature is still used.

Signed-off-by: Josef Bacik <josef@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 1a94ee4c4fbb..d2a7ff53e99a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8200,6 +8200,8 @@ int btrfs_read_block_groups(struct btrfs_root *root)
                 need_clear = 1;
         if (btrfs_test_opt(root, CLEAR_CACHE))
                 need_clear = 1;
+        if (!btrfs_test_opt(root, SPACE_CACHE) && cache_gen)
+                printk(KERN_INFO "btrfs: disk space caching is enabled\n");
 
         while (1) {
                 ret = find_first_block_group(root, path, &key);