diff options
| -rw-r--r-- | fs/xfs/xfs_buf.c | 16 | ||||
| -rw-r--r-- | fs/xfs/xfs_buf.h | 5 | ||||
| -rw-r--r-- | fs/xfs/xfs_error.c | 3 | ||||
| -rw-r--r-- | fs/xfs/xfs_error.h | 4 |
4 files changed, 23 insertions, 5 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index 2f97c12ca75e..d481dd2b29a6 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -42,6 +42,7 @@ #include "xfs_mount.h" #include "xfs_trace.h" #include "xfs_log.h" +#include "xfs_error.h" static kmem_zone_t *xfs_buf_zone; @@ -2129,3 +2130,18 @@ xfs_buf_terminate(void) { kmem_zone_destroy(xfs_buf_zone); } + +void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + + /* + * Set the lru reference count to 0 based on the error injection tag. + * This allows userspace to disrupt buffer caching for debug/testing + * purposes. + */ + if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BUF_LRU_REF)) + lru_ref = 0; + + atomic_set(&bp->b_lru_ref, lru_ref); +} diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index bf71507ddb16..f873bb786824 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -352,10 +352,7 @@ extern void xfs_buf_terminate(void); #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) -static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) -{ - atomic_set(&bp->b_lru_ref, lru_ref); -} +void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref); static inline int xfs_buf_ispinned(struct xfs_buf *bp) { diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c index eaf86f55b7f2..6732b0a0d826 100644 --- a/fs/xfs/xfs_error.c +++ b/fs/xfs/xfs_error.c @@ -58,6 +58,7 @@ static unsigned int xfs_errortag_random_default[] = { XFS_RANDOM_DROP_WRITES, XFS_RANDOM_LOG_BAD_CRC, XFS_RANDOM_LOG_ITEM_PIN, + XFS_RANDOM_BUF_LRU_REF, }; struct xfs_errortag_attr { @@ -163,6 +164,7 @@ 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); +XFS_ERRORTAG_ATTR_RW(buf_lru_ref, XFS_ERRTAG_BUF_LRU_REF); static struct attribute *xfs_errortag_attrs[] = { XFS_ERRORTAG_ATTR_LIST(noerror), @@ -196,6 +198,7 @@ static struct attribute *xfs_errortag_attrs[] = { XFS_ERRORTAG_ATTR_LIST(drop_writes), XFS_ERRORTAG_ATTR_LIST(log_bad_crc), XFS_ERRORTAG_ATTR_LIST(log_item_pin), + XFS_ERRORTAG_ATTR_LIST(buf_lru_ref), NULL, }; diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h index 7c4bef3bddb7..78a7f43f8d01 100644 --- a/fs/xfs/xfs_error.h +++ b/fs/xfs/xfs_error.h @@ -107,7 +107,8 @@ 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_LOG_ITEM_PIN 30 -#define XFS_ERRTAG_MAX 31 +#define XFS_ERRTAG_BUF_LRU_REF 31 +#define XFS_ERRTAG_MAX 32 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -143,6 +144,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp); #define XFS_RANDOM_DROP_WRITES 1 #define XFS_RANDOM_LOG_BAD_CRC 1 #define XFS_RANDOM_LOG_ITEM_PIN 1 +#define XFS_RANDOM_BUF_LRU_REF 2 #ifdef DEBUG extern int xfs_errortag_init(struct xfs_mount *mp); |