fuse: update inode size and invalidate attributes on fallocate

An fallocate request without FALLOC_FL_KEEP_SIZE set can extend the
size of a file. Update the inode size after a successful fallocate.

Also invalidate the inode attributes after a successful fallocate
to ensure we pick up the latest attribute values (i.e., i_blocks).

Signed-off-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

1 files changed, 12 insertions, 3 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a200a2d80377..d9f467907791 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2492,11 +2492,20 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
         }
         fuse_put_request(fc, req);
 
+        if (err)
+                goto out;
+
+        /* we could have extended the file */
+        if (!(mode & FALLOC_FL_KEEP_SIZE))
+                fuse_write_update_size(inode, offset + length);
+
+        if (mode & FALLOC_FL_PUNCH_HOLE)
+                truncate_pagecache_range(inode, offset, offset + length - 1);
+
+        fuse_invalidate_attr(inode);
+
 out:
         if (mode & FALLOC_FL_PUNCH_HOLE) {
-                if (!err)
-                        truncate_pagecache_range(inode, offset,
-                                                 offset + length - 1);
                 fuse_release_nowrite(inode);
                 mutex_unlock(&inode->i_mutex);
         }