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- A stable DM multipath fix to restore ability to pass integrity data

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- 2 DM multipath fixes for a fix that was merged into 4.15-rc5
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Merge tag 'for-4.16/dm-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - a stable DM multipath fix to restore ability to pass integrity data

 - two DM multipath fixes for a fix that was merged into 4.16-rc5

* tag 'for-4.16/dm-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm mpath: fix passing integrity data
  dm mpath: eliminate need to use scsi_device_from_queue
  dm mpath: fix uninitialized 'pg_init_wait' waitqueue_head NULL pointer
This commit is contained in:
Linus Torvalds 2018-03-15 11:04:46 -07:00
commit 667058ae60
1 changed files with 21 additions and 22 deletions
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43
drivers/md/dm-mpath.c
View File

@ -22,7 +22,6 @@
#include <linux/time.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_dh.h>
#include <linux/atomic.h>
#include <linux/blk-mq.h>
@ -223,6 +222,16 @@ static int alloc_multipath_stage2(struct dm_target *ti, struct multipath *m)
dm_table_set_type(ti->table, m->queue_mode);
/*
* Init fields that are only used when a scsi_dh is attached
* - must do this unconditionally (really doesn't hurt non-SCSI uses)
*/
set_bit(MPATHF_QUEUE_IO, &m->flags);
atomic_set(&m->pg_init_in_progress, 0);
atomic_set(&m->pg_init_count, 0);
m->pg_init_delay_msecs = DM_PG_INIT_DELAY_DEFAULT;
init_waitqueue_head(&m->pg_init_wait);
return 0;
}
@ -331,7 +340,6 @@ static void __switch_pg(struct multipath *m, struct priority_group *pg)
set_bit(MPATHF_PG_INIT_REQUIRED, &m->flags);
set_bit(MPATHF_QUEUE_IO, &m->flags);
} else {
/* FIXME: not needed if no scsi_dh is attached */
clear_bit(MPATHF_PG_INIT_REQUIRED, &m->flags);
clear_bit(MPATHF_QUEUE_IO, &m->flags);
}
@ -796,15 +804,14 @@ static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg,
return 0;
}
static int setup_scsi_dh(struct block_device *bdev, struct multipath *m, char **error)
static int setup_scsi_dh(struct block_device *bdev, struct multipath *m,
const char *attached_handler_name, char **error)
{
struct request_queue *q = bdev_get_queue(bdev);
const char *attached_handler_name;
int r;
if (test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags)) {
retain:
attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
if (attached_handler_name) {
/*
* Clear any hw_handler_params associated with a
@ -823,16 +830,6 @@ retain:
*/
kfree(m->hw_handler_name);
m->hw_handler_name = attached_handler_name;
/*
* Init fields that are only used when a scsi_dh is attached
*/
if (!test_and_set_bit(MPATHF_QUEUE_IO, &m->flags)) {
atomic_set(&m->pg_init_in_progress, 0);
atomic_set(&m->pg_init_count, 0);
m->pg_init_delay_msecs = DM_PG_INIT_DELAY_DEFAULT;
init_waitqueue_head(&m->pg_init_wait);
}
}
}
@ -868,7 +865,8 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps
int r;
struct pgpath *p;
struct multipath *m = ti->private;
struct scsi_device *sdev;
struct request_queue *q;
const char *attached_handler_name;
/* we need at least a path arg */
if (as->argc < 1) {
@ -887,11 +885,11 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps
goto bad;
}
sdev = scsi_device_from_queue(bdev_get_queue(p->path.dev->bdev));
if (sdev) {
put_device(&sdev->sdev_gendev);
q = bdev_get_queue(p->path.dev->bdev);
attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
if (attached_handler_name) {
INIT_DELAYED_WORK(&p->activate_path, activate_path_work);
r = setup_scsi_dh(p->path.dev->bdev, m, &ti->error);
r = setup_scsi_dh(p->path.dev->bdev, m, attached_handler_name, &ti->error);
if (r) {
dm_put_device(ti, p->path.dev);
goto bad;
@ -2022,8 +2020,9 @@ static int multipath_busy(struct dm_target *ti)
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
.version = {1, 12, 0},
.features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE,
.version = {1, 13, 0},
.features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE |
DM_TARGET_PASSES_INTEGRITY,
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,