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.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
mm/filemap.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 1694623..e08f3b9 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2982,7 +2982,12 @@ 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);
+ if (!inode_trylock(inode)) {
+ /* Don't sleep on inode rwsem */
+ if (iocb->ki_flags & IOCB_NOWAIT)
+ return -EAGAIN;
+ inode_lock(inode);
+ }
ret = generic_write_checks(iocb, from);
if (ret > 0)
ret = __generic_file_write_iter(iocb, from);
--
2.10.2
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