fuse: honor RLIMIT_FSIZE in fuse_file_fallocate

fstests generic/228 reported this failure that fuse fallocate does not
honor what 'ulimit -f' has set.

This adds the necessary inode_newsize_ok() check.

Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Fixes: 05ba1f082300 ("fuse: add FALLOCATE operation")
Cc: <stable@vger.kernel.org> # v3.5
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 5428c81879b2..f811af4f6507 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3044,6 +3044,13 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
                 }
         }
 
+        if (!(mode & FALLOC_FL_KEEP_SIZE) &&
+            offset + length > i_size_read(inode)) {
+                err = inode_newsize_ok(inode, offset + length);
+                if (err)
+                        return err;
+        }
+
         if (!(mode & FALLOC_FL_KEEP_SIZE))
                 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);