xfs: add debug knob to slow down writeback for fun

Add a new error injection knob so that we can arbitrarily slow down
writeback to test for race conditions and aberrant reclaim behavior if
the writeback mechanisms are slow to issue writeback.  This will enable
functional testing for the ifork sequence counters introduced in commit
745b3f76d1c8 ("xfs: maintain a sequence count for inode fork
manipulations").

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
index 580ccbd..f5f6291 100644 (file)
--- a/fs/xfs/libxfs/xfs_errortag.h
+++ b/fs/xfs/libxfs/xfs_errortag.h
@@ -61,7 +61,8 @@
 #define XFS_ERRTAG_LARP                                        39
 #define XFS_ERRTAG_DA_LEAF_SPLIT                       40
 #define XFS_ERRTAG_ATTR_LEAF_TO_NODE                   41
-#define XFS_ERRTAG_MAX                                 42
+#define XFS_ERRTAG_WB_DELAY_MS                         42
+#define XFS_ERRTAG_MAX                                 43
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -107,5 +108,6 @@
 #define XFS_RANDOM_LARP                                        1
 #define XFS_RANDOM_DA_LEAF_SPLIT                       1
 #define XFS_RANDOM_ATTR_LEAF_TO_NODE                   1
+#define XFS_RANDOM_WB_DELAY_MS                         3000
 
 #endif /* __XFS_ERRORTAG_H_ */

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index a22d90a..4173420 100644 (file)
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -17,6 +17,8 @@
 #include "xfs_bmap.h"
 #include "xfs_bmap_util.h"
 #include "xfs_reflink.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
 
 struct xfs_writepage_ctx {
        struct iomap_writepage_ctx ctx;
@@ -217,11 +219,17 @@ xfs_imap_valid(
         * checked (and found nothing at this offset) could have added
         * overlapping blocks.
         */
-       if (XFS_WPC(wpc)->data_seq != READ_ONCE(ip->i_df.if_seq))
+       if (XFS_WPC(wpc)->data_seq != READ_ONCE(ip->i_df.if_seq)) {
+               trace_xfs_wb_data_iomap_invalid(ip, &wpc->iomap,
+                               XFS_WPC(wpc)->data_seq, XFS_DATA_FORK);
                return false;
+       }
        if (xfs_inode_has_cow_data(ip) &&
-           XFS_WPC(wpc)->cow_seq != READ_ONCE(ip->i_cowfp->if_seq))
+           XFS_WPC(wpc)->cow_seq != READ_ONCE(ip->i_cowfp->if_seq)) {
+               trace_xfs_wb_cow_iomap_invalid(ip, &wpc->iomap,
+                               XFS_WPC(wpc)->cow_seq, XFS_COW_FORK);
                return false;
+       }
        return true;
 }
 
@@ -285,6 +293,8 @@ xfs_map_blocks(
        if (xfs_is_shutdown(mp))
                return -EIO;
 
+       XFS_ERRORTAG_DELAY(mp, XFS_ERRTAG_WB_DELAY_MS);
+
        /*
         * COW fork blocks can overlap data fork blocks even if the blocks
         * aren't shared.  COW I/O always takes precedent, so we must always

diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index dea3c06..2d6e3c7 100644 (file)
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -60,6 +60,7 @@ static unsigned int xfs_errortag_random_default[] = {
        XFS_RANDOM_LARP,
        XFS_RANDOM_DA_LEAF_SPLIT,
        XFS_RANDOM_ATTR_LEAF_TO_NODE,
+       XFS_RANDOM_WB_DELAY_MS,
 };
 
 struct xfs_errortag_attr {
@@ -175,6 +176,7 @@ XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
 XFS_ERRORTAG_ATTR_RW(larp,             XFS_ERRTAG_LARP);
 XFS_ERRORTAG_ATTR_RW(da_leaf_split,    XFS_ERRTAG_DA_LEAF_SPLIT);
 XFS_ERRORTAG_ATTR_RW(attr_leaf_to_node,        XFS_ERRTAG_ATTR_LEAF_TO_NODE);
+XFS_ERRORTAG_ATTR_RW(wb_delay_ms,      XFS_ERRTAG_WB_DELAY_MS);
 
 static struct attribute *xfs_errortag_attrs[] = {
        XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -218,6 +220,7 @@ static struct attribute *xfs_errortag_attrs[] = {
        XFS_ERRORTAG_ATTR_LIST(larp),
        XFS_ERRORTAG_ATTR_LIST(da_leaf_split),
        XFS_ERRORTAG_ATTR_LIST(attr_leaf_to_node),
+       XFS_ERRORTAG_ATTR_LIST(wb_delay_ms),
        NULL,
 };
 ATTRIBUTE_GROUPS(xfs_errortag);
@@ -268,6 +271,19 @@ xfs_errortag_valid(
 }
 
 bool
+xfs_errortag_enabled(
+       struct xfs_mount        *mp,
+       unsigned int            tag)
+{
+       if (!mp->m_errortag)
+               return false;
+       if (!xfs_errortag_valid(tag))
+               return false;
+
+       return mp->m_errortag[tag] != 0;
+}
+
+bool
 xfs_errortag_test(
        struct xfs_mount        *mp,
        const char              *expression,

diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index 5191e91..dbe6c37 100644 (file)
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -45,6 +45,18 @@ extern bool xfs_errortag_test(struct xfs_mount *mp, const char *expression,
                const char *file, int line, unsigned int error_tag);
 #define XFS_TEST_ERROR(expr, mp, tag)          \
        ((expr) || xfs_errortag_test((mp), #expr, __FILE__, __LINE__, (tag)))
+bool xfs_errortag_enabled(struct xfs_mount *mp, unsigned int tag);
+#define XFS_ERRORTAG_DELAY(mp, tag)            \
+       do { \
+               might_sleep(); \
+               if (!xfs_errortag_enabled((mp), (tag))) \
+                       break; \
+               xfs_warn_ratelimited((mp), \
+"Injecting %ums delay at file %s, line %d, on filesystem \"%s\"", \
+                               (mp)->m_errortag[(tag)], __FILE__, __LINE__, \
+                               (mp)->m_super->s_id); \
+               mdelay((mp)->m_errortag[(tag)]); \
+       } while (0)
 
 extern int xfs_errortag_get(struct xfs_mount *mp, unsigned int error_tag);
 extern int xfs_errortag_set(struct xfs_mount *mp, unsigned int error_tag,
@@ -55,6 +67,7 @@ extern int xfs_errortag_clearall(struct xfs_mount *mp);
 #define xfs_errortag_init(mp)                  (0)
 #define xfs_errortag_del(mp)
 #define XFS_TEST_ERROR(expr, mp, tag)          (expr)
+#define XFS_ERRORTAG_DELAY(mp, tag)            ((void)0)
 #define xfs_errortag_set(mp, tag, val)         (ENOSYS)
 #define xfs_errortag_add(mp, tag)              (ENOSYS)
 #define xfs_errortag_clearall(mp)              (ENOSYS)

diff --git a/fs/xfs/xfs_trace.c b/fs/xfs/xfs_trace.c
index d269ef5..8a5dc15 100644 (file)
--- a/fs/xfs/xfs_trace.c
+++ b/fs/xfs/xfs_trace.c
@@ -34,6 +34,8 @@
 #include "xfs_ag.h"
 #include "xfs_ag_resv.h"
 #include "xfs_error.h"
+#include <linux/iomap.h>
+#include "xfs_iomap.h"
 
 /*
  * We include this last to have the helpers above available for the trace

diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 372d871..c9ada95 100644 (file)
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -3352,6 +3352,50 @@ DEFINE_EVENT(xfs_inode_irec_class, name, \
        TP_PROTO(struct xfs_inode *ip, struct xfs_bmbt_irec *irec), \
        TP_ARGS(ip, irec))
 
+/* inode iomap invalidation events */
+DECLARE_EVENT_CLASS(xfs_wb_invalid_class,
+       TP_PROTO(struct xfs_inode *ip, const struct iomap *iomap, unsigned int wpcseq, int whichfork),
+       TP_ARGS(ip, iomap, wpcseq, whichfork),
+       TP_STRUCT__entry(
+               __field(dev_t, dev)
+               __field(xfs_ino_t, ino)
+               __field(u64, addr)
+               __field(loff_t, pos)
+               __field(u64, len)
+               __field(u16, type)
+               __field(u16, flags)
+               __field(u32, wpcseq)
+               __field(u32, forkseq)
+       ),
+       TP_fast_assign(
+               __entry->dev = VFS_I(ip)->i_sb->s_dev;
+               __entry->ino = ip->i_ino;
+               __entry->addr = iomap->addr;
+               __entry->pos = iomap->offset;
+               __entry->len = iomap->length;
+               __entry->type = iomap->type;
+               __entry->flags = iomap->flags;
+               __entry->wpcseq = wpcseq;
+               __entry->forkseq = READ_ONCE(xfs_ifork_ptr(ip, whichfork)->if_seq);
+       ),
+       TP_printk("dev %d:%d ino 0x%llx pos 0x%llx addr 0x%llx bytecount 0x%llx type 0x%x flags 0x%x wpcseq 0x%x forkseq 0x%x",
+                 MAJOR(__entry->dev), MINOR(__entry->dev),
+                 __entry->ino,
+                 __entry->pos,
+                 __entry->addr,
+                 __entry->len,
+                 __entry->type,
+                 __entry->flags,
+                 __entry->wpcseq,
+                 __entry->forkseq)
+);
+#define DEFINE_WB_INVALID_EVENT(name) \
+DEFINE_EVENT(xfs_wb_invalid_class, name, \
+       TP_PROTO(struct xfs_inode *ip, const struct iomap *iomap, unsigned int wpcseq, int whichfork), \
+       TP_ARGS(ip, iomap, wpcseq, whichfork))
+DEFINE_WB_INVALID_EVENT(xfs_wb_cow_iomap_invalid);
+DEFINE_WB_INVALID_EVENT(xfs_wb_data_iomap_invalid);
+
 /* refcount/reflink tracepoint definitions */
 
 /* reflink tracepoints */