@@ -1078,6 +1078,10 @@ xfs_file_iomap_end_delalloc(
xfs_fileoff_t end_fsb;
int error = 0;
+ /* behave as if the write failed if drop writes is enabled */
+ if (xfs_mp_drop_writes(mp))
+ written = 0;
+
start_fsb = XFS_B_TO_FSB(mp, offset + written);
if (unlikely(!written))
start_fsb = XFS_B_TO_FSBT(mp, offset);
@@ -200,11 +200,12 @@ typedef struct xfs_mount {
/*
* DEBUG mode instrumentation to test and/or trigger delayed allocation
* block killing in the event of failed writes. When enabled, all
- * buffered writes are forced to fail. All delalloc blocks in the range
- * of the write (including pre-existing delalloc blocks!) are tossed as
- * part of the write failure error handling sequence.
+ * buffered writes are silenty dropped and handled as if they failed.
+ * All delalloc blocks in the range of the write (including pre-existing
+ * delalloc blocks!) are tossed as part of the write failure error
+ * handling sequence.
*/
- bool m_fail_writes;
+ bool m_drop_writes;
#endif
} xfs_mount_t;
@@ -325,13 +326,13 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
#ifdef DEBUG
static inline bool
-xfs_mp_fail_writes(struct xfs_mount *mp)
+xfs_mp_drop_writes(struct xfs_mount *mp)
{
- return mp->m_fail_writes;
+ return mp->m_drop_writes;
}
#else
static inline bool
-xfs_mp_fail_writes(struct xfs_mount *mp)
+xfs_mp_drop_writes(struct xfs_mount *mp)
{
return 0;
}
@@ -93,7 +93,7 @@ to_mp(struct kobject *kobject)
#ifdef DEBUG
STATIC ssize_t
-fail_writes_store(
+drop_writes_store(
struct kobject *kobject,
const char *buf,
size_t count)
@@ -107,9 +107,9 @@ fail_writes_store(
return ret;
if (val == 1)
- mp->m_fail_writes = true;
+ mp->m_drop_writes = true;
else if (val == 0)
- mp->m_fail_writes = false;
+ mp->m_drop_writes = false;
else
return -EINVAL;
@@ -117,21 +117,21 @@ fail_writes_store(
}
STATIC ssize_t
-fail_writes_show(
+drop_writes_show(
struct kobject *kobject,
char *buf)
{
struct xfs_mount *mp = to_mp(kobject);
- return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_writes ? 1 : 0);
+ return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_drop_writes ? 1 : 0);
}
-XFS_SYSFS_ATTR_RW(fail_writes);
+XFS_SYSFS_ATTR_RW(drop_writes);
#endif /* DEBUG */
static struct attribute *xfs_mp_attrs[] = {
#ifdef DEBUG
- ATTR_LIST(fail_writes),
+ ATTR_LIST(drop_writes),
#endif
NULL,
};
A debug mode write failure mechanism was introduced to XFS in commit 801cc4e17a ("xfs: debug mode forced buffered write failure") to facilitate targeted testing of delalloc indirect reservation management from userspace. This code was subsequently rendered ineffective by the move to iomap based buffered writes in commit 68a9f5e700 ("xfs: implement iomap based buffered write path"). This likely went unnoticed because the associated userspace code had not made it into xfstests. Resurrect this mechanism to facilitate effective indlen reservation testing from xfstests. The move to iomap based buffered writes relocated the hook this mechanism needs to return write failure from XFS to generic code. The failure trigger must remain in XFS. Given that limitation, convert this from a write failure mechanism to one that simply drops writes without returning failure to userspace. Rename all "fail_writes" references to "drop_writes" to illustrate the point. This is more hacky than preferred, but still triggers the XFS error handling behavior required to drive the indlen tests. This is only available in DEBUG mode and for testing purposes only. Signed-off-by: Brian Foster <bfoster@redhat.com> --- fs/xfs/xfs_iomap.c | 4 ++++ fs/xfs/xfs_mount.h | 15 ++++++++------- fs/xfs/xfs_sysfs.c | 14 +++++++------- 3 files changed, 19 insertions(+), 14 deletions(-)