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authorAnthony Iliopoulos <ailiopoulos@suse.com>2019-05-18 01:25:07 +0200
committerAnthony Iliopoulos <ailiopoulos@suse.com>2019-05-18 01:25:07 +0200
commitededccfbc3d5f71ae772b0834e214341cf333cfb (patch)
treeeec48472fc0373a956074e3ba29048c1d9fcfbff
parent3dd8a674a713e8bd75a8116f36d51418843ef18c (diff)
xfs: add log item pinning error injection tag (bsc#1114427).
-rw-r--r--fs/xfs/xfs_error.c3
-rw-r--r--fs/xfs/xfs_error.h4
-rw-r--r--fs/xfs/xfs_trans_ail.c17
3 files changed, 22 insertions, 2 deletions
diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index 7478dd1dc985..c20771fb91b0 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -57,6 +57,7 @@ static unsigned int xfs_errortag_random_default[] = {
XFS_RANDOM_AG_RESV_CRITICAL,
XFS_RANDOM_DROP_WRITES,
XFS_RANDOM_LOG_BAD_CRC,
+ XFS_RANDOM_LOG_ITEM_PIN,
};
struct xfs_errortag_attr {
@@ -161,6 +162,7 @@ XFS_ERRORTAG_ATTR_RW(bmap_finish_one, XFS_ERRTAG_BMAP_FINISH_ONE);
XFS_ERRORTAG_ATTR_RW(ag_resv_critical, XFS_ERRTAG_AG_RESV_CRITICAL);
XFS_ERRORTAG_ATTR_RW(drop_writes, XFS_ERRTAG_DROP_WRITES);
XFS_ERRORTAG_ATTR_RW(log_bad_crc, XFS_ERRTAG_LOG_BAD_CRC);
+XFS_ERRORTAG_ATTR_RW(log_item_pin, XFS_ERRTAG_LOG_ITEM_PIN);
static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -193,6 +195,7 @@ static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
XFS_ERRORTAG_ATTR_LIST(drop_writes),
XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
+ XFS_ERRORTAG_ATTR_LIST(log_item_pin),
NULL,
};
diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index 7577be5f09bc..7c4bef3bddb7 100644
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -106,7 +106,8 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
*/
#define XFS_ERRTAG_DROP_WRITES 28
#define XFS_ERRTAG_LOG_BAD_CRC 29
-#define XFS_ERRTAG_MAX 30
+#define XFS_ERRTAG_LOG_ITEM_PIN 30
+#define XFS_ERRTAG_MAX 31
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -141,6 +142,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_RANDOM_AG_RESV_CRITICAL 4
#define XFS_RANDOM_DROP_WRITES 1
#define XFS_RANDOM_LOG_BAD_CRC 1
+#define XFS_RANDOM_LOG_ITEM_PIN 1
#ifdef DEBUG
extern int xfs_errortag_init(struct xfs_mount *mp);
diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index 70f5ab017323..354368a906e5 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -325,6 +325,21 @@ xfs_ail_delete(
xfs_trans_ail_cursor_clear(ailp, lip);
}
+static inline uint
+xfsaild_push_item(
+ struct xfs_ail *ailp,
+ struct xfs_log_item *lip)
+{
+ /*
+ * If log item pinning is enabled, skip the push and track the item as
+ * pinned. This can help induce head-behind-tail conditions.
+ */
+ if (XFS_TEST_ERROR(false, ailp->xa_mount, XFS_ERRTAG_LOG_ITEM_PIN))
+ return XFS_ITEM_PINNED;
+
+ return lip->li_ops->iop_push(lip, &ailp->xa_buf_list);
+}
+
static long
xfsaild_push(
struct xfs_ail *ailp)
@@ -382,7 +397,7 @@ xfsaild_push(
* rely on the AIL cursor implementation to be able to deal with
* the dropped lock.
*/
- lock_result = lip->li_ops->iop_push(lip, &ailp->xa_buf_list);
+ lock_result = xfsaild_push_item(ailp, lip);
switch (lock_result) {
case XFS_ITEM_SUCCESS:
XFS_STATS_INC(mp, xs_push_ail_success);