fuse: generic_write_checks() for direct_io

This fixes O_APPEND in direct IO mode.  Also checks writes against file size
limits, notably rlimits.

Reported by Greg Bruno.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index d0ed60bc3188..adf7995232b8 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -610,7 +610,9 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
         ssize_t res;
         /* Don't allow parallel writes to the same file */
         mutex_lock(&inode->i_mutex);
-        res = fuse_direct_io(file, buf, count, ppos, 1);
+        res = generic_write_checks(file, ppos, &count, 0);
+        if (!res)
+                res = fuse_direct_io(file, buf, count, ppos, 1);
         mutex_unlock(&inode->i_mutex);
         return res;
 }