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xfs: convert drop_writes to use the errortag mechanism 

We now have enhanced error injection that can control the frequency
with which errors happen, so convert drop_writes to use this.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-06-20 17:54:48 -07:00
parent 9e24cfd044
commit f8c47250ba
5 changed files with 15 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/xfs/xfs_error.c
View File

@ -55,6 +55,7 @@ static unsigned int xfs_errortag_random_default[] = {
XFS_RANDOM_REFCOUNT_FINISH_ONE,
XFS_RANDOM_BMAP_FINISH_ONE,
XFS_RANDOM_AG_RESV_CRITICAL,
XFS_RANDOM_DROP_WRITES,
};
struct xfs_errortag_attr {
@ -157,6 +158,7 @@ XFS_ERRORTAG_ATTR_RW(refcount_continue_update, XFS_ERRTAG_REFCOUNT_CONTINUE_UPDA
XFS_ERRORTAG_ATTR_RW(refcount_finish_one, XFS_ERRTAG_REFCOUNT_FINISH_ONE);
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);
static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(noerror),
@ -187,6 +189,7 @@ static struct attribute *xfs_errortag_attrs[] = {
XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
XFS_ERRORTAG_ATTR_LIST(drop_writes),
NULL,
};

12
fs/xfs/xfs_error.h
View File

@ -96,7 +96,16 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25
#define XFS_ERRTAG_BMAP_FINISH_ONE 26
#define XFS_ERRTAG_AG_RESV_CRITICAL 27
#define XFS_ERRTAG_MAX 28
/*
* DEBUG mode instrumentation to test and/or trigger delayed allocation
* block killing in the event of failed writes. When enabled, all
* 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.
*/
#define XFS_ERRTAG_DROP_WRITES 28
#define XFS_ERRTAG_MAX 29
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@ -129,6 +138,7 @@ extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_RANDOM_REFCOUNT_FINISH_ONE 1
#define XFS_RANDOM_BMAP_FINISH_ONE 1
#define XFS_RANDOM_AG_RESV_CRITICAL 4
#define XFS_RANDOM_DROP_WRITES 1
#ifdef DEBUG
extern int xfs_errortag_init(struct xfs_mount *mp);

2
fs/xfs/xfs_iomap.c
View File

@ -1097,7 +1097,7 @@ xfs_file_iomap_end_delalloc(
* Behave as if the write failed if drop writes is enabled. Set the NEW
* flag to force delalloc cleanup.
*/
if (xfs_mp_drop_writes(mp)) {
if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DROP_WRITES)) {
iomap->flags |= IOMAP_F_NEW;
written = 0;
}

24
fs/xfs/xfs_mount.h
View File

@ -205,16 +205,6 @@ typedef struct xfs_mount {
*/
unsigned int *m_errortag;
struct xfs_kobj m_errortag_kobj;
/*
* DEBUG mode instrumentation to test and/or trigger delayed allocation
* block killing in the event of failed writes. When enabled, all
* 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_drop_writes;
#endif
} xfs_mount_t;
@ -333,20 +323,6 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
}
#ifdef DEBUG
static inline bool
xfs_mp_drop_writes(struct xfs_mount *mp)
{
return mp->m_drop_writes;
}
#else
static inline bool
xfs_mp_drop_writes(struct xfs_mount *mp)
{
return 0;
}
#endif
/* per-AG block reservation data structures*/
enum xfs_ag_resv_type {
XFS_AG_RESV_NONE = 0,

42
fs/xfs/xfs_sysfs.c
View File

@ -90,49 +90,7 @@ to_mp(struct kobject *kobject)
return container_of(kobj, struct xfs_mount, m_kobj);
}
#ifdef DEBUG
STATIC ssize_t
drop_writes_store(
struct kobject *kobject,
const char *buf,
size_t count)
{
struct xfs_mount *mp = to_mp(kobject);
int ret;
int val;
ret = kstrtoint(buf, 0, &val);
if (ret)
return ret;
if (val == 1)
mp->m_drop_writes = true;
else if (val == 0)
mp->m_drop_writes = false;
else
return -EINVAL;
return count;
}
STATIC ssize_t
drop_writes_show(
struct kobject *kobject,
char *buf)
{
struct xfs_mount *mp = to_mp(kobject);
return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_drop_writes ? 1 : 0);
}
XFS_SYSFS_ATTR_RW(drop_writes);
#endif /* DEBUG */
static struct attribute *xfs_mp_attrs[] = {
#ifdef DEBUG
ATTR_LIST(drop_writes),
#endif
NULL,
};