[PATCH 3.16 047/132] fuse: honor RLIMIT_FSIZE in fuse_file_fallocate

[Ben Hutchings]

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Liu Bo <bo....@linux.alibaba.com>

commit 0cbade024ba501313da3b7e5dd2a188a6bc491b5 upstream.

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....@linux.alibaba.com>
Fixes: 05ba1f082300 ("fuse: add FALLOCATE operation")
Signed-off-by: Miklos Szeredi <mszer...@redhat.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 fs/fuse/file.c | 7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3017,6 +3017,13 @@ static long fuse_file_fallocate(struct f
                }
        }
 
+       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);