[PATCH 3.16 124/346] fuse: fsync() did not return IO errors

[Ben Hutchings]

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

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

From: Alexey Kuznetsov <kuz...@parallels.com>

commit ac7f052b9e1534c8248f814b6f0068ad8d4a06d2 upstream.

Due to implementation of fuse writeback filemap_write_and_wait_range() does
not catch errors. We have to do this directly after fuse_sync_writes()

Signed-off-by: Alexey Kuznetsov <kuz...@virtuozzo.com>
Signed-off-by: Maxim Patlasov <mpatla...@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszer...@redhat.com>
Fixes: 4d99ff8f12eb ("fuse: Turn writeback cache on")
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 fs/fuse/file.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -499,6 +499,21 @@ int fuse_fsync_common(struct file *file,
                goto out;
 
        fuse_sync_writes(inode);
+
+       /*
+        * Due to implementation of fuse writeback
+        * filemap_write_and_wait_range() does not catch errors.
+        * We have to do this directly after fuse_sync_writes()
+        */
+       if (test_bit(AS_ENOSPC, &file->f_mapping->flags) &&
+           test_and_clear_bit(AS_ENOSPC, &file->f_mapping->flags))
+               err = -ENOSPC;
+       if (test_bit(AS_EIO, &file->f_mapping->flags) &&
+           test_and_clear_bit(AS_EIO, &file->f_mapping->flags))
+               err = -EIO;
+       if (err)
+               goto out;
+
        err = sync_inode_metadata(inode, 1);
        if (err)
                goto out;