aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorBrian Foster <bfoster@redhat.com>2017-04-21 12:40:44 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-07 12:07:51 +0200
commit10f0b2c3c225bae7eddf88a18466b9133a716c72 (patch)
tree2c746acdbf828d08d6e0503349014017744df2f2
parent95487d4be1e9eb7a43120d852c86c80803cfe51d (diff)
downloadlinux-aarch64-10f0b2c3c225bae7eddf88a18466b9133a716c72.tar.gz
xfs: fix up quotacheck buffer list error handling
commit 20e8a063786050083fe05b4f45be338c60b49126 upstream. The quotacheck error handling of the delwri buffer list assumes the resident buffers are locked and doesn't clear the _XBF_DELWRI_Q flag on the buffers that are dequeued. This can lead to assert failures on buffer release and possibly other locking problems. Move this code to a delwri queue cancel helper function to encapsulate the logic required to properly release buffers from a delwri queue. Update the helper to clear the delwri queue flag and call it from quotacheck. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/xfs/xfs_buf.c24
-rw-r--r--fs/xfs/xfs_buf.h1
-rw-r--r--fs/xfs/xfs_qm.c7
3 files changed, 26 insertions, 6 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 93a00c925eb9..16269271ebd6 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1066,6 +1066,8 @@ void
xfs_buf_unlock(
struct xfs_buf *bp)
{
+ ASSERT(xfs_buf_islocked(bp));
+
XB_CLEAR_OWNER(bp);
up(&bp->b_sema);
@@ -1804,6 +1806,28 @@ error:
}
/*
+ * Cancel a delayed write list.
+ *
+ * Remove each buffer from the list, clear the delwri queue flag and drop the
+ * associated buffer reference.
+ */
+void
+xfs_buf_delwri_cancel(
+ struct list_head *list)
+{
+ struct xfs_buf *bp;
+
+ while (!list_empty(list)) {
+ bp = list_first_entry(list, struct xfs_buf, b_list);
+
+ xfs_buf_lock(bp);
+ bp->b_flags &= ~_XBF_DELWRI_Q;
+ list_del_init(&bp->b_list);
+ xfs_buf_relse(bp);
+ }
+}
+
+/*
* Add a buffer to the delayed write list.
*
* This queues a buffer for writeout if it hasn't already been. Note that
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 2768b508280f..ad514a8025dd 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -329,6 +329,7 @@ extern void *xfs_buf_offset(struct xfs_buf *, size_t);
extern void xfs_buf_stale(struct xfs_buf *bp);
/* Delayed Write Buffer Routines */
+extern void xfs_buf_delwri_cancel(struct list_head *);
extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
extern int xfs_buf_delwri_submit(struct list_head *);
extern int xfs_buf_delwri_submit_nowait(struct list_head *);
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index b669b123287b..8b9a9f15f022 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -1384,12 +1384,7 @@ xfs_qm_quotacheck(
mp->m_qflags |= flags;
error_return:
- while (!list_empty(&buffer_list)) {
- struct xfs_buf *bp =
- list_first_entry(&buffer_list, struct xfs_buf, b_list);
- list_del_init(&bp->b_list);
- xfs_buf_relse(bp);
- }
+ xfs_buf_delwri_cancel(&buffer_list);
if (error) {
xfs_warn(mp,