From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
A failure to lock i_rwsem would mean there is I/O being performed
by another thread. So, let's bail.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
mm/filemap.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index d8d7df8..50cee70 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2885,7 +2885,12 @@ ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct inode *inode = file->f_mapping->host;
ssize_t ret;
- inode_lock(inode);
+ /* Don't sleep on inode rwsem */
+ if (iocb->ki_flags & IOCB_NONBLOCKING) {
+ if (!inode_trylock(inode))
+ return -EAGAIN;
+ } else
+ inode_lock(inode);
ret = generic_write_checks(iocb, from);
if (ret > 0)
ret = __generic_file_write_iter(iocb, from);
--
2.10.2
