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-rw-r--r--fs/inode.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 775cbabd4fa..3cc50432046 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1551,6 +1551,8 @@ void touch_atime(struct path *path)
* Btrfs), but since we touch atime while walking down the path we
* really don't care if we failed to update the atime of the file,
* so just ignore the return value.
+ * We may also fail on filesystems that have the ability to make parts
+ * of the fs read only, e.g. subvolumes in Btrfs.
*/
update_time(inode, &now, S_ATIME);
mnt_drop_write(mnt);