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Diffstat (limited to 'fs/xfs/xfs_file.c')
-rw-r--r--fs/xfs/xfs_file.c27
1 files changed, 17 insertions, 10 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 1f2e2845eb76..a7ceae90110e 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -529,18 +529,17 @@ xfs_file_dio_aio_write(
count = iov_iter_count(from);
/*
- * If we are doing unaligned IO, wait for all other IO to drain,
- * otherwise demote the lock if we had to take the exclusive lock
- * for other reasons in xfs_file_aio_write_checks.
+ * If we are doing unaligned IO, we can't allow any other overlapping IO
+ * in-flight at the same time or we risk data corruption. Wait for all
+ * other IO to drain before we submit. If the IO is aligned, demote the
+ * iolock if we had to take the exclusive lock in
+ * xfs_file_aio_write_checks() for other reasons.
*/
if (unaligned_io) {
- /* If we are going to wait for other DIO to finish, bail */
- if (iocb->ki_flags & IOCB_NOWAIT) {
- if (atomic_read(&inode->i_dio_count))
- return -EAGAIN;
- } else {
- inode_dio_wait(inode);
- }
+ /* unaligned dio always waits, bail */
+ if (iocb->ki_flags & IOCB_NOWAIT)
+ return -EAGAIN;
+ inode_dio_wait(inode);
} else if (iolock == XFS_IOLOCK_EXCL) {
xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
iolock = XFS_IOLOCK_SHARED;
@@ -548,6 +547,14 @@ xfs_file_dio_aio_write(
trace_xfs_file_direct_write(ip, count, iocb->ki_pos);
ret = iomap_dio_rw(iocb, from, &xfs_iomap_ops, xfs_dio_write_end_io);
+
+ /*
+ * If unaligned, this is the only IO in-flight. If it has not yet
+ * completed, wait on it before we release the iolock to prevent
+ * subsequent overlapping IO.
+ */
+ if (ret == -EIOCBQUEUED && unaligned_io)
+ inode_dio_wait(inode);
out:
xfs_iunlock(ip, iolock);