Commit 802ea9d8 authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 'dm-3.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper changes from Mike Snitzer:

 - The most significant change this cycle is request-based DM now
   supports stacking ontop of blk-mq devices.  This blk-mq support
   changes the model request-based DM uses for cloning a request to
   relying on calling blk_get_request() directly from the underlying
   blk-mq device.

   An early consumer of this code is Intel's emerging NVMe hardware;
   thanks to Keith Busch for working on, and pushing for, these changes.

 - A few other small fixes and cleanups across other DM targets.

* tag 'dm-3.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: inherit QUEUE_FLAG_SG_GAPS flags from underlying queues
  dm snapshot: remove unnecessary NULL checks before vfree() calls
  dm mpath: simplify failure path of dm_multipath_init()
  dm thin metadata: remove unused dm_pool_get_data_block_size()
  dm ioctl: fix stale comment above dm_get_inactive_table()
  dm crypt: update url in CONFIG_DM_CRYPT help text
  dm bufio: fix time comparison to use time_after_eq()
  dm: use time_in_range() and time_after()
  dm raid: fix a couple integer overflows
  dm table: train hybrid target type detection to select blk-mq if appropriate
  dm: allocate requests in target when stacking on blk-mq devices
  dm: prepare for allocating blk-mq clone requests in target
  dm: submit stacked requests in irq enabled context
  dm: split request structure out from dm_rq_target_io structure
  dm: remove exports for request-based interfaces without external callers
parents 8494bcf5 a4afe76b
......@@ -231,9 +231,8 @@ config DM_CRYPT
transparently encrypts the data on it. You'll need to activate
the ciphers you're going to use in the cryptoapi configuration.
Information on how to use dm-crypt can be found on
<http://www.saout.de/misc/dm-crypt/>
For further information on dm-crypt and userspace tools see:
<http://code.google.com/p/cryptsetup/wiki/DMCrypt>
To compile this code as a module, choose M here: the module will
be called dm-crypt.
......
......@@ -11,6 +11,7 @@
#include <linux/device-mapper.h>
#include <linux/dm-io.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/vmalloc.h>
#include <linux/shrinker.h>
#include <linux/module.h>
......@@ -1739,7 +1740,7 @@ static unsigned get_max_age_hz(void)
static bool older_than(struct dm_buffer *b, unsigned long age_hz)
{
return (jiffies - b->last_accessed) >= age_hz;
return time_after_eq(jiffies, b->last_accessed + age_hz);
}
static void __evict_old_buffers(struct dm_bufio_client *c, unsigned long age_hz)
......
......@@ -11,6 +11,7 @@
#include <linux/dm-io.h>
#include <linux/dm-kcopyd.h>
#include <linux/jiffies.h>
#include <linux/init.h>
#include <linux/mempool.h>
#include <linux/module.h>
......@@ -1562,8 +1563,8 @@ static void process_bio(struct cache *cache, struct prealloc *structs,
static int need_commit_due_to_time(struct cache *cache)
{
return jiffies < cache->last_commit_jiffies ||
jiffies > cache->last_commit_jiffies + COMMIT_PERIOD;
return !time_in_range(jiffies, cache->last_commit_jiffies,
cache->last_commit_jiffies + COMMIT_PERIOD);
}
static int commit_if_needed(struct cache *cache)
......
......@@ -639,8 +639,8 @@ static int check_name(const char *name)
/*
* On successful return, the caller must not attempt to acquire
* _hash_lock without first calling dm_table_put, because dm_table_destroy
* waits for this dm_table_put and could be called under this lock.
* _hash_lock without first calling dm_put_live_table, because dm_table_destroy
* waits for this dm_put_live_table and could be called under this lock.
*/
static struct dm_table *dm_get_inactive_table(struct mapped_device *md, int *srcu_idx)
{
......
......@@ -6,6 +6,7 @@
#include <linux/bio.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/dm-dirty-log.h>
#include <linux/device-mapper.h>
#include <linux/dm-log-userspace.h>
......@@ -829,7 +830,7 @@ static int userspace_is_remote_recovering(struct dm_dirty_log *log,
int r;
uint64_t region64 = region;
struct log_c *lc = log->context;
static unsigned long long limit;
static unsigned long limit;
struct {
int64_t is_recovering;
uint64_t in_sync_hint;
......@@ -845,7 +846,7 @@ static int userspace_is_remote_recovering(struct dm_dirty_log *log,
*/
if (region < lc->in_sync_hint)
return 0;
else if (jiffies < limit)
else if (time_after(limit, jiffies))
return 1;
limit = jiffies + (HZ / 4);
......
......@@ -11,6 +11,7 @@
#include "dm-path-selector.h"
#include "dm-uevent.h"
#include <linux/blkdev.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/mempool.h>
......@@ -378,18 +379,18 @@ static int __must_push_back(struct multipath *m)
/*
* Map cloned requests
*/
static int multipath_map(struct dm_target *ti, struct request *clone,
union map_info *map_context)
static int __multipath_map(struct dm_target *ti, struct request *clone,
union map_info *map_context,
struct request *rq, struct request **__clone)
{
struct multipath *m = (struct multipath *) ti->private;
int r = DM_MAPIO_REQUEUE;
size_t nr_bytes = blk_rq_bytes(clone);
unsigned long flags;
size_t nr_bytes = clone ? blk_rq_bytes(clone) : blk_rq_bytes(rq);
struct pgpath *pgpath;
struct block_device *bdev;
struct dm_mpath_io *mpio;
spin_lock_irqsave(&m->lock, flags);
spin_lock_irq(&m->lock);
/* Do we need to select a new pgpath? */
if (!m->current_pgpath ||
......@@ -411,25 +412,61 @@ static int multipath_map(struct dm_target *ti, struct request *clone,
/* ENOMEM, requeue */
goto out_unlock;
mpio = map_context->ptr;
mpio->pgpath = pgpath;
mpio->nr_bytes = nr_bytes;
bdev = pgpath->path.dev->bdev;
spin_unlock_irq(&m->lock);
if (clone) {
/* Old request-based interface: allocated clone is passed in */
clone->q = bdev_get_queue(bdev);
clone->rq_disk = bdev->bd_disk;
clone->cmd_flags |= REQ_FAILFAST_TRANSPORT;
mpio = map_context->ptr;
mpio->pgpath = pgpath;
mpio->nr_bytes = nr_bytes;
} else {
/* blk-mq request-based interface */
*__clone = blk_get_request(bdev_get_queue(bdev),
rq_data_dir(rq), GFP_KERNEL);
if (IS_ERR(*__clone))
/* ENOMEM, requeue */
return r;
(*__clone)->bio = (*__clone)->biotail = NULL;
(*__clone)->rq_disk = bdev->bd_disk;
(*__clone)->cmd_flags |= REQ_FAILFAST_TRANSPORT;
}
if (pgpath->pg->ps.type->start_io)
pgpath->pg->ps.type->start_io(&pgpath->pg->ps,
&pgpath->path,
nr_bytes);
r = DM_MAPIO_REMAPPED;
return DM_MAPIO_REMAPPED;
out_unlock:
spin_unlock_irqrestore(&m->lock, flags);
spin_unlock_irq(&m->lock);
return r;
}
static int multipath_map(struct dm_target *ti, struct request *clone,
union map_info *map_context)
{
return __multipath_map(ti, clone, map_context, NULL, NULL);
}
static int multipath_clone_and_map(struct dm_target *ti, struct request *rq,
union map_info *map_context,
struct request **clone)
{
return __multipath_map(ti, NULL, map_context, rq, clone);
}
static void multipath_release_clone(struct request *clone)
{
blk_put_request(clone);
}
/*
* If we run out of usable paths, should we queue I/O or error it?
*/
......@@ -1666,11 +1703,13 @@ static int multipath_busy(struct dm_target *ti)
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
.version = {1, 7, 0},
.version = {1, 8, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
.map_rq = multipath_map,
.clone_and_map_rq = multipath_clone_and_map,
.release_clone_rq = multipath_release_clone,
.rq_end_io = multipath_end_io,
.presuspend = multipath_presuspend,
.postsuspend = multipath_postsuspend,
......@@ -1694,16 +1733,15 @@ static int __init dm_multipath_init(void)
r = dm_register_target(&multipath_target);
if (r < 0) {
DMERR("register failed %d", r);
kmem_cache_destroy(_mpio_cache);
return -EINVAL;
r = -EINVAL;
goto bad_register_target;
}
kmultipathd = alloc_workqueue("kmpathd", WQ_MEM_RECLAIM, 0);
if (!kmultipathd) {
DMERR("failed to create workqueue kmpathd");
dm_unregister_target(&multipath_target);
kmem_cache_destroy(_mpio_cache);
return -ENOMEM;
r = -ENOMEM;
goto bad_alloc_kmultipathd;
}
/*
......@@ -1716,16 +1754,23 @@ static int __init dm_multipath_init(void)
WQ_MEM_RECLAIM);
if (!kmpath_handlerd) {
DMERR("failed to create workqueue kmpath_handlerd");
destroy_workqueue(kmultipathd);
dm_unregister_target(&multipath_target);
kmem_cache_destroy(_mpio_cache);
return -ENOMEM;
r = -ENOMEM;
goto bad_alloc_kmpath_handlerd;
}
DMINFO("version %u.%u.%u loaded",
multipath_target.version[0], multipath_target.version[1],
multipath_target.version[2]);
return 0;
bad_alloc_kmpath_handlerd:
destroy_workqueue(kmultipathd);
bad_alloc_kmultipathd:
dm_unregister_target(&multipath_target);
bad_register_target:
kmem_cache_destroy(_mpio_cache);
return r;
}
......
......@@ -1237,7 +1237,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
argv++;
/* Skip over RAID params for now and find out # of devices */
if (num_raid_params + 1 > argc) {
if (num_raid_params >= argc) {
ti->error = "Arguments do not agree with counts given";
return -EINVAL;
}
......@@ -1248,6 +1248,12 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
return -EINVAL;
}
argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
if (argc != (num_raid_devs * 2)) {
ti->error = "Supplied RAID devices does not match the count given";
return -EINVAL;
}
rs = context_alloc(ti, rt, (unsigned)num_raid_devs);
if (IS_ERR(rs))
return PTR_ERR(rs);
......@@ -1256,16 +1262,8 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
if (ret)
goto bad;
ret = -EINVAL;
argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
argv += num_raid_params + 1;
if (argc != (num_raid_devs * 2)) {
ti->error = "Supplied RAID devices does not match the count given";
goto bad;
}
ret = dev_parms(rs, argv);
if (ret)
goto bad;
......
......@@ -200,15 +200,10 @@ static int alloc_area(struct pstore *ps)
static void free_area(struct pstore *ps)
{
if (ps->area)
vfree(ps->area);
ps->area = NULL;
if (ps->zero_area)
vfree(ps->zero_area);
ps->zero_area = NULL;
if (ps->header_area)
vfree(ps->header_area);
ps->header_area = NULL;
}
......@@ -605,7 +600,6 @@ static void persistent_dtr(struct dm_exception_store *store)
free_area(ps);
/* Allocated in persistent_read_metadata */
if (ps->callbacks)
vfree(ps->callbacks);
kfree(ps);
......
......@@ -827,10 +827,11 @@ static int dm_table_set_type(struct dm_table *t)
{
unsigned i;
unsigned bio_based = 0, request_based = 0, hybrid = 0;
bool use_blk_mq = false;
struct dm_target *tgt;
struct dm_dev_internal *dd;
struct list_head *devices;
unsigned live_md_type;
unsigned live_md_type = dm_get_md_type(t->md);
for (i = 0; i < t->num_targets; i++) {
tgt = t->targets + i;
......@@ -854,8 +855,8 @@ static int dm_table_set_type(struct dm_table *t)
* Determine the type from the live device.
* Default to bio-based if device is new.
*/
live_md_type = dm_get_md_type(t->md);
if (live_md_type == DM_TYPE_REQUEST_BASED)
if (live_md_type == DM_TYPE_REQUEST_BASED ||
live_md_type == DM_TYPE_MQ_REQUEST_BASED)
request_based = 1;
else
bio_based = 1;
......@@ -869,16 +870,6 @@ static int dm_table_set_type(struct dm_table *t)
BUG_ON(!request_based); /* No targets in this table */
/* Non-request-stackable devices can't be used for request-based dm */
devices = dm_table_get_devices(t);
list_for_each_entry(dd, devices, list) {
if (!blk_queue_stackable(bdev_get_queue(dd->dm_dev->bdev))) {
DMWARN("table load rejected: including"
" non-request-stackable devices");
return -EINVAL;
}
}
/*
* Request-based dm supports only tables that have a single target now.
* To support multiple targets, request splitting support is needed,
......@@ -890,6 +881,36 @@ static int dm_table_set_type(struct dm_table *t)
return -EINVAL;
}
/* Non-request-stackable devices can't be used for request-based dm */
devices = dm_table_get_devices(t);
list_for_each_entry(dd, devices, list) {
struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev);
if (!blk_queue_stackable(q)) {
DMERR("table load rejected: including"
" non-request-stackable devices");
return -EINVAL;
}
if (q->mq_ops)
use_blk_mq = true;
}
if (use_blk_mq) {
/* verify _all_ devices in the table are blk-mq devices */
list_for_each_entry(dd, devices, list)
if (!bdev_get_queue(dd->dm_dev->bdev)->mq_ops) {
DMERR("table load rejected: not all devices"
" are blk-mq request-stackable");
return -EINVAL;
}
t->type = DM_TYPE_MQ_REQUEST_BASED;
} else if (hybrid && list_empty(devices) && live_md_type != DM_TYPE_NONE) {
/* inherit live MD type */
t->type = live_md_type;
} else
t->type = DM_TYPE_REQUEST_BASED;
return 0;
......@@ -907,7 +928,15 @@ struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
bool dm_table_request_based(struct dm_table *t)
{
return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED;
unsigned table_type = dm_table_get_type(t);
return (table_type == DM_TYPE_REQUEST_BASED ||
table_type == DM_TYPE_MQ_REQUEST_BASED);
}
bool dm_table_mq_request_based(struct dm_table *t)
{
return dm_table_get_type(t) == DM_TYPE_MQ_REQUEST_BASED;
}
static int dm_table_alloc_md_mempools(struct dm_table *t)
......@@ -1360,6 +1389,14 @@ static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev,
return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags);
}
static int queue_supports_sg_gaps(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
return q && !test_bit(QUEUE_FLAG_SG_GAPS, &q->queue_flags);
}
static bool dm_table_all_devices_attribute(struct dm_table *t,
iterate_devices_callout_fn func)
{
......@@ -1480,6 +1517,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
else
queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
if (dm_table_all_devices_attribute(t, queue_supports_sg_gaps))
queue_flag_clear_unlocked(QUEUE_FLAG_SG_GAPS, q);
else
queue_flag_set_unlocked(QUEUE_FLAG_SG_GAPS, q);
dm_table_set_integrity(t);
/*
......
......@@ -137,13 +137,26 @@ static int io_err_map_rq(struct dm_target *ti, struct request *clone,
return -EIO;
}
static int io_err_clone_and_map_rq(struct dm_target *ti, struct request *rq,
union map_info *map_context,
struct request **clone)
{
return -EIO;
}
static void io_err_release_clone_rq(struct request *clone)
{
}
static struct target_type error_target = {
.name = "error",
.version = {1, 2, 0},
.version = {1, 3, 0},
.ctr = io_err_ctr,
.dtr = io_err_dtr,
.map = io_err_map,
.map_rq = io_err_map_rq,
.clone_and_map_rq = io_err_clone_and_map_rq,
.release_clone_rq = io_err_release_clone_rq,
};
int __init dm_target_init(void)
......
......@@ -1635,15 +1635,6 @@ int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
return r;
}
int dm_pool_get_data_block_size(struct dm_pool_metadata *pmd, sector_t *result)
{
down_read(&pmd->root_lock);
*result = pmd->data_block_size;
up_read(&pmd->root_lock);
return 0;
}
int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result)
{
int r = -EINVAL;
......
......@@ -182,8 +182,6 @@ int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd,
int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
dm_block_t *result);
int dm_pool_get_data_block_size(struct dm_pool_metadata *pmd, sector_t *result);
int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result);
int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result);
......
......@@ -11,6 +11,7 @@
#include <linux/device-mapper.h>
#include <linux/dm-io.h>
#include <linux/dm-kcopyd.h>
#include <linux/jiffies.h>
#include <linux/log2.h>
#include <linux/list.h>
#include <linux/rculist.h>
......@@ -1700,8 +1701,8 @@ static void process_cell_fail(struct thin_c *tc, struct dm_bio_prison_cell *cell
*/
static int need_commit_due_to_time(struct pool *pool)
{
return jiffies < pool->last_commit_jiffies ||
jiffies > pool->last_commit_jiffies + COMMIT_PERIOD;
return !time_in_range(jiffies, pool->last_commit_jiffies,
pool->last_commit_jiffies + COMMIT_PERIOD);
}
#define thin_pbd(node) rb_entry((node), struct dm_thin_endio_hook, rb_node)
......
This diff is collapsed.
......@@ -37,6 +37,7 @@
#define DM_TYPE_NONE 0
#define DM_TYPE_BIO_BASED 1
#define DM_TYPE_REQUEST_BASED 2
#define DM_TYPE_MQ_REQUEST_BASED 3
/*
* List of devices that a metadevice uses and should open/close.
......@@ -73,6 +74,7 @@ int dm_table_any_busy_target(struct dm_table *t);
unsigned dm_table_get_type(struct dm_table *t);
struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
bool dm_table_request_based(struct dm_table *t);
bool dm_table_mq_request_based(struct dm_table *t);
void dm_table_free_md_mempools(struct dm_table *t);
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
......@@ -99,7 +101,8 @@ int dm_setup_md_queue(struct mapped_device *md);
/*
* To check whether the target type is request-based or not (bio-based).
*/
#define dm_target_request_based(t) ((t)->type->map_rq != NULL)
#define dm_target_request_based(t) (((t)->type->map_rq != NULL) || \
((t)->type->clone_and_map_rq != NULL))
/*
* To check whether the target type is a hybrid (capable of being
......
......@@ -48,6 +48,11 @@ typedef void (*dm_dtr_fn) (struct dm_target *ti);
typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio);
typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone,
union map_info *map_context);
typedef int (*dm_clone_and_map_request_fn) (struct dm_target *ti,
struct request *rq,
union map_info *map_context,
struct request **clone);
typedef void (*dm_release_clone_request_fn) (struct request *clone);
/*
* Returns:
......@@ -143,6 +148,8 @@ struct target_type {
dm_dtr_fn dtr;
dm_map_fn map;
dm_map_request_fn map_rq;
dm_clone_and_map_request_fn clone_and_map_rq;
dm_release_clone_request_fn release_clone_rq;
dm_endio_fn end_io;
dm_request_endio_fn rq_end_io;
dm_presuspend_fn presuspend;
......@@ -600,9 +607,6 @@ static inline unsigned long to_bytes(sector_t n)
/*-----------------------------------------------------------------
* Helper for block layer and dm core operations
*---------------------------------------------------------------*/
void dm_dispatch_request(struct request *rq);
void dm_requeue_unmapped_request(struct request *rq);
void dm_kill_unmapped_request(struct request *rq, int error);
int dm_underlying_device_busy(struct request_queue *q);
#endif /* _LINUX_DEVICE_MAPPER_H */
......@@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 29
#define DM_VERSION_MINOR 30
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2014-10-28)"
#define DM_VERSION_EXTRA "-ioctl (2014-12-22)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
......
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