[PATCH v2] fuse: fuse_flush must check mapping->flags for errors

From: Maxim Patlasov
Date: Wed Jul 20 2016 - 05:45:57 EST


fuse_flush() calls write_inode_now() that triggers writeback, but actual
writeback will happen later, on fuse_sync_writes(). If an error happens,
fuse_writepage_end() will set error bit in mapping->flags. So, we have to
check mapping->flags after fuse_sync_writes().

Changed in v2:
- fixed silly type: check must be *after* fuse_sync_writes()

Signed-off-by: Maxim Patlasov <mpatlasov@xxxxxxxxxxxxx>
---
fs/fuse/file.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index ad1da83..6cac3dc 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -417,6 +417,15 @@ static int fuse_flush(struct file *file, fl_owner_t id)
fuse_sync_writes(inode);
inode_unlock(inode);

+ 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)
+ return err;
+
req = fuse_get_req_nofail_nopages(fc, file);
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;