Release 4.14 drivers/md/dm.c
/*
* Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
#include "dm-core.h"
#include "dm-rq.h"
#include "dm-uevent.h"
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/sched/signal.h>
#include <linux/blkpg.h>
#include <linux/bio.h>
#include <linux/mempool.h>
#include <linux/dax.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/uio.h>
#include <linux/hdreg.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/pr.h>
#define DM_MSG_PREFIX "core"
/*
* Cookies are numeric values sent with CHANGE and REMOVE
* uevents while resuming, removing or renaming the device.
*/
#define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE"
#define DM_COOKIE_LENGTH 24
static const char *_name = DM_NAME;
static unsigned int major = 0;
static unsigned int _major = 0;
static DEFINE_IDR(_minor_idr);
static DEFINE_SPINLOCK(_minor_lock);
static void do_deferred_remove(struct work_struct *w);
static DECLARE_WORK(deferred_remove_work, do_deferred_remove);
static struct workqueue_struct *deferred_remove_workqueue;
atomic_t dm_global_event_nr = ATOMIC_INIT(0);
DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq);
void dm_issue_global_event(void)
{
atomic_inc(&dm_global_event_nr);
wake_up(&dm_global_eventq);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 19 | 100.00% | 1 | 100.00% |
Total | 19 | 100.00% | 1 | 100.00% |
/*
* One of these is allocated per bio.
*/
struct dm_io {
struct mapped_device *md;
blk_status_t status;
atomic_t io_count;
struct bio *bio;
unsigned long start_time;
spinlock_t endio_lock;
struct dm_stats_aux stats_aux;
};
#define MINOR_ALLOCED ((void *)-1)
/*
* Bits for the md->flags field.
*/
#define DMF_BLOCK_IO_FOR_SUSPEND 0
#define DMF_SUSPENDED 1
#define DMF_FROZEN 2
#define DMF_FREEING 3
#define DMF_DELETING 4
#define DMF_NOFLUSH_SUSPENDING 5
#define DMF_DEFERRED_REMOVE 6
#define DMF_SUSPENDED_INTERNALLY 7
#define DM_NUMA_NODE NUMA_NO_NODE
static int dm_numa_node = DM_NUMA_NODE;
/*
* For mempools pre-allocation at the table loading time.
*/
struct dm_md_mempools {
mempool_t *io_pool;
struct bio_set *bs;
};
struct table_device {
struct list_head list;
atomic_t count;
struct dm_dev dm_dev;
};
static struct kmem_cache *_io_cache;
static struct kmem_cache *_rq_tio_cache;
static struct kmem_cache *_rq_cache;
/*
* Bio-based DM's mempools' reserved IOs set by the user.
*/
#define RESERVED_BIO_BASED_IOS 16
static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS;
static int __dm_get_module_param_int(int *module_param, int min, int max)
{
int param = ACCESS_ONCE(*module_param);
int modified_param = 0;
bool modified = true;
if (param < min)
modified_param = min;
else if (param > max)
modified_param = max;
else
modified = false;
if (modified) {
(void)cmpxchg(module_param, param, modified_param);
param = modified_param;
}
return param;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 57 | 66.28% | 2 | 40.00% |
Kiyoshi Ueda | 27 | 31.40% | 1 | 20.00% |
Alasdair G. Kergon | 1 | 1.16% | 1 | 20.00% |
Mikulas Patocka | 1 | 1.16% | 1 | 20.00% |
Total | 86 | 100.00% | 5 | 100.00% |
unsigned __dm_get_module_param(unsigned *module_param,
unsigned def, unsigned max)
{
unsigned param = ACCESS_ONCE(*module_param);
unsigned modified_param = 0;
if (!param)
modified_param = def;
else if (param > max)
modified_param = max;
if (modified_param) {
(void)cmpxchg(module_param, param, modified_param);
param = modified_param;
}
return param;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 62 | 83.78% | 4 | 40.00% |
Kiyoshi Ueda | 5 | 6.76% | 1 | 10.00% |
Keith Busch | 2 | 2.70% | 1 | 10.00% |
Andrew Morton | 2 | 2.70% | 2 | 20.00% |
Stefan Bader | 2 | 2.70% | 1 | 10.00% |
Alan Cox | 1 | 1.35% | 1 | 10.00% |
Total | 74 | 100.00% | 10 | 100.00% |
unsigned dm_get_reserved_bio_based_ios(void)
{
return __dm_get_module_param(&reserved_bio_based_ios,
RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 11 | 61.11% | 1 | 50.00% |
Kiyoshi Ueda | 7 | 38.89% | 1 | 50.00% |
Total | 18 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios);
static unsigned dm_get_numa_node(void)
{
return __dm_get_module_param_int(&dm_numa_node,
DM_NUMA_NODE, num_online_nodes() - 1);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 19 | 86.36% | 2 | 66.67% |
Kiyoshi Ueda | 3 | 13.64% | 1 | 33.33% |
Total | 22 | 100.00% | 3 | 100.00% |
static int __init local_init(void)
{
int r = -ENOMEM;
/* allocate a slab for the dm_ios */
_io_cache = KMEM_CACHE(dm_io, 0);
if (!_io_cache)
return r;
_rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0);
if (!_rq_tio_cache)
goto out_free_io_cache;
_rq_cache = kmem_cache_create("dm_old_clone_request", sizeof(struct request),
__alignof__(struct request), 0, NULL);
if (!_rq_cache)
goto out_free_rq_tio_cache;
r = dm_uevent_init();
if (r)
goto out_free_rq_cache;
deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1);
if (!deferred_remove_workqueue) {
r = -ENOMEM;
goto out_uevent_exit;
}
_major = major;
r = register_blkdev(_major, _name);
if (r < 0)
goto out_free_workqueue;
if (!_major)
_major = r;
return 0;
out_free_workqueue:
destroy_workqueue(deferred_remove_workqueue);
out_uevent_exit:
dm_uevent_exit();
out_free_rq_cache:
kmem_cache_destroy(_rq_cache);
out_free_rq_tio_cache:
kmem_cache_destroy(_rq_tio_cache);
out_free_io_cache:
kmem_cache_destroy(_io_cache);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 179 | 94.71% | 3 | 42.86% |
Kiyoshi Ueda | 4 | 2.12% | 1 | 14.29% |
Mikulas Patocka | 3 | 1.59% | 1 | 14.29% |
Bryn M. Reeves | 2 | 1.06% | 1 | 14.29% |
Alan Cox | 1 | 0.53% | 1 | 14.29% |
Total | 189 | 100.00% | 7 | 100.00% |
static void local_exit(void)
{
flush_scheduled_work();
destroy_workqueue(deferred_remove_workqueue);
kmem_cache_destroy(_rq_cache);
kmem_cache_destroy(_rq_tio_cache);
kmem_cache_destroy(_io_cache);
unregister_blkdev(_major, _name);
dm_uevent_exit();
_major = 0;
DMINFO("cleaned up");
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 34 | 68.00% | 3 | 75.00% |
Kiyoshi Ueda | 16 | 32.00% | 1 | 25.00% |
Total | 50 | 100.00% | 4 | 100.00% |
static int (*_inits[])(void) __initdata = {
local_init,
dm_target_init,
dm_linear_init,
dm_stripe_init,
dm_io_init,
dm_kcopyd_init,
dm_interface_init,
dm_statistics_init,
};
static void (*_exits[])(void) = {
local_exit,
dm_target_exit,
dm_linear_exit,
dm_stripe_exit,
dm_io_exit,
dm_kcopyd_exit,
dm_interface_exit,
dm_statistics_exit,
};
static int __init dm_init(void)
{
const int count = ARRAY_SIZE(_inits);
int r, i;
for (i = 0; i < count; i++) {
r = _inits[i]();
if (r)
goto bad;
}
return 0;
bad:
while (i--)
_exits[i]();
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 70 | 93.33% | 3 | 60.00% |
Kiyoshi Ueda | 4 | 5.33% | 1 | 20.00% |
Peter Osterlund | 1 | 1.33% | 1 | 20.00% |
Total | 75 | 100.00% | 5 | 100.00% |
static void __exit dm_exit(void)
{
int i = ARRAY_SIZE(_exits);
while (i--)
_exits[i]();
/*
* Should be empty by this point.
*/
idr_destroy(&_minor_idr);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 29 | 80.56% | 4 | 66.67% |
Kiyoshi Ueda | 4 | 11.11% | 1 | 16.67% |
Martin K. Petersen | 3 | 8.33% | 1 | 16.67% |
Total | 36 | 100.00% | 6 | 100.00% |
/*
* Block device functions
*/
int dm_deleting_md(struct mapped_device *md)
{
return test_bit(DMF_DELETING, &md->flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 15 | 71.43% | 3 | 50.00% |
Kiyoshi Ueda | 3 | 14.29% | 1 | 16.67% |
Martin K. Petersen | 2 | 9.52% | 1 | 16.67% |
Joe Thornber | 1 | 4.76% | 1 | 16.67% |
Total | 21 | 100.00% | 6 | 100.00% |
static int dm_blk_open(struct block_device *bdev, fmode_t mode)
{
struct mapped_device *md;
spin_lock(&_minor_lock);
md = bdev->bd_disk->private_data;
if (!md)
goto out;
if (test_bit(DMF_FREEING, &md->flags) ||
dm_deleting_md(md)) {
md = NULL;
goto out;
}
dm_get(md);
atomic_inc(&md->open_count);
out:
spin_unlock(&_minor_lock);
return md ? 0 : -ENXIO;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 79 | 82.29% | 3 | 60.00% |
Kiyoshi Ueda | 14 | 14.58% | 1 | 20.00% |
Mikulas Patocka | 3 | 3.12% | 1 | 20.00% |
Total | 96 | 100.00% | 5 | 100.00% |
static void dm_blk_close(struct gendisk *disk, fmode_t mode)
{
struct mapped_device *md;
spin_lock(&_minor_lock);
md = disk->private_data;
if (WARN_ON(!md))
goto out;
if (atomic_dec_and_test(&md->open_count) &&
(test_bit(DMF_DEFERRED_REMOVE, &md->flags)))
queue_work(deferred_remove_workqueue, &deferred_remove_work);
dm_put(md);
out:
spin_unlock(&_minor_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 66 | 77.65% | 3 | 42.86% |
Joe Thornber | 13 | 15.29% | 2 | 28.57% |
Alan Cox | 4 | 4.71% | 1 | 14.29% |
Kiyoshi Ueda | 2 | 2.35% | 1 | 14.29% |
Total | 85 | 100.00% | 7 | 100.00% |
int dm_open_count(struct mapped_device *md)
{
return atomic_read(&md->open_count);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 10 | 52.63% | 1 | 33.33% |
Martin K. Petersen | 5 | 26.32% | 1 | 33.33% |
Kiyoshi Ueda | 4 | 21.05% | 1 | 33.33% |
Total | 19 | 100.00% | 3 | 100.00% |
/*
* Guarantees nothing is using the device before it's deleted.
*/
int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred)
{
int r = 0;
spin_lock(&_minor_lock);
if (dm_open_count(md)) {
r = -EBUSY;
if (mark_deferred)
set_bit(DMF_DEFERRED_REMOVE, &md->flags);
} else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags))
r = -EEXIST;
else
set_bit(DMF_DELETING, &md->flags);
spin_unlock(&_minor_lock);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 79 | 82.29% | 3 | 50.00% |
Mikulas Patocka | 14 | 14.58% | 1 | 16.67% |
Keith Busch | 2 | 2.08% | 1 | 16.67% |
Alasdair G. Kergon | 1 | 1.04% | 1 | 16.67% |
Total | 96 | 100.00% | 6 | 100.00% |
int dm_cancel_deferred_remove(struct mapped_device *md)
{
int r = 0;
spin_lock(&_minor_lock);
if (test_bit(DMF_DELETING, &md->flags))
r = -EBUSY;
else
clear_bit(DMF_DEFERRED_REMOVE, &md->flags);
spin_unlock(&_minor_lock);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 51 | 87.93% | 3 | 60.00% |
Mikulas Patocka | 4 | 6.90% | 1 | 20.00% |
Kiyoshi Ueda | 3 | 5.17% | 1 | 20.00% |
Total | 58 | 100.00% | 5 | 100.00% |
static void do_deferred_remove(struct work_struct *w)
{
dm_deferred_remove();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 12 | 85.71% | 2 | 50.00% |
Kiyoshi Ueda | 1 | 7.14% | 1 | 25.00% |
Mikulas Patocka | 1 | 7.14% | 1 | 25.00% |
Total | 14 | 100.00% | 4 | 100.00% |
sector_t dm_get_size(struct mapped_device *md)
{
return get_capacity(md->disk);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 15 | 83.33% | 2 | 66.67% |
Mikulas Patocka | 3 | 16.67% | 1 | 33.33% |
Total | 18 | 100.00% | 3 | 100.00% |
struct request_queue *dm_get_md_queue(struct mapped_device *md)
{
return md->queue;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 17 | 100.00% | 2 | 100.00% |
Total | 17 | 100.00% | 2 | 100.00% |
struct dm_stats *dm_get_stats(struct mapped_device *md)
{
return &md->stats;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 18 | 100.00% | 2 | 100.00% |
Total | 18 | 100.00% | 2 | 100.00% |
static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct mapped_device *md = bdev->bd_disk->private_data;
return dm_get_geometry(md, geo);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 21 | 60.00% | 1 | 50.00% |
Mikulas Patocka | 14 | 40.00% | 1 | 50.00% |
Total | 35 | 100.00% | 2 | 100.00% |
static int dm_grab_bdev_for_ioctl(struct mapped_device *md,
struct block_device **bdev,
fmode_t *mode)
{
struct dm_target *tgt;
struct dm_table *map;
int srcu_idx, r;
retry:
r = -ENOTTY;
map = dm_get_live_table(md, &srcu_idx);
if (!map || !dm_table_get_size(map))
goto out;
/* We only support devices that have a single target */
if (dm_table_get_num_targets(map) != 1)
goto out;
tgt = dm_table_get_target(map, 0);
if (!tgt->type->prepare_ioctl)
goto out;
if (dm_suspended_md(md)) {
r = -EAGAIN;
goto out;
}
r = tgt->type->prepare_ioctl(tgt, bdev, mode);
if (r < 0)
goto out;
bdgrab(*bdev);
dm_put_live_table(md, srcu_idx);
return r;
out:
dm_put_live_table(md, srcu_idx);
if (r == -ENOTCONN && !fatal_signal_pending(current)) {
msleep(10);
goto retry;
}
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 124 | 64.25% | 1 | 11.11% |
Kiyoshi Ueda | 27 | 13.99% | 1 | 11.11% |
Alan Cox | 12 | 6.22% | 1 | 11.11% |
Joe Thornber | 11 | 5.70% | 1 | 11.11% |
Alasdair G. Kergon | 8 | 4.15% | 1 | 11.11% |
Jun'ichi Nomura | 4 | 2.07% | 1 | 11.11% |
Andrew Morton | 3 | 1.55% | 1 | 11.11% |
Mikulas Patocka | 2 | 1.04% | 1 | 11.11% |
Stefan Bader | 2 | 1.04% | 1 | 11.11% |
Total | 193 | 100.00% | 9 | 100.00% |
static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct mapped_device *md = bdev->bd_disk->private_data;
int r;
r = dm_grab_bdev_for_ioctl(md, &bdev, &mode);
if (r < 0)
return r;
if (r > 0) {
/*
* Target determined this ioctl is being issued against a
* subset of the parent bdev; require extra privileges.
*/
if (!capable(CAP_SYS_RAWIO)) {
DMWARN_LIMIT(
"%s: sending ioctl %x to DM device without required privilege.",
current->comm, cmd);
r = -ENOIOCTLCMD;
goto out;
}
}
r = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
out:
bdput(bdev);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 69 | 57.98% | 2 | 33.33% |
Christoph Hellwig | 21 | 17.65% | 1 | 16.67% |
Alasdair G. Kergon | 20 | 16.81% | 1 | 16.67% |
Kent Overstreet | 8 | 6.72% | 1 | 16.67% |
Mikulas Patocka | 1 | 0.84% | 1 | 16.67% |
Total | 119 | 100.00% | 6 | 100.00% |
static struct dm_io *alloc_io(struct mapped_device *md)
{
return mempool_alloc(md->io_pool, GFP_NOIO);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 8 | 34.78% | 1 | 20.00% |
Kiyoshi Ueda | 7 | 30.43% | 1 | 20.00% |
Kent Overstreet | 5 | 21.74% | 1 | 20.00% |
Mikulas Patocka | 2 | 8.70% | 1 | 20.00% |
Alasdair G. Kergon | 1 | 4.35% | 1 | 20.00% |
Total | 23 | 100.00% | 5 | 100.00% |
static void free_io(struct mapped_device *md, struct dm_io *io)
{
mempool_free(io, md->io_pool);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 11 | 44.00% | 1 | 20.00% |
Kiyoshi Ueda | 10 | 40.00% | 1 | 20.00% |
Mikulas Patocka | 3 | 12.00% | 2 | 40.00% |
Kent Overstreet | 1 | 4.00% | 1 | 20.00% |
Total | 25 | 100.00% | 5 | 100.00% |
static void free_tio(struct dm_target_io *tio)
{
bio_put(&tio->clone);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 19 | 100.00% | 2 | 100.00% |
Total | 19 | 100.00% | 2 | 100.00% |
int md_in_flight(struct mapped_device *md)
{
return atomic_read(&md->pending[READ]) +
atomic_read(&md->pending[WRITE]);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 22 | 66.67% | 2 | 40.00% |
Kent Overstreet | 6 | 18.18% | 1 | 20.00% |
Kiyoshi Ueda | 4 | 12.12% | 1 | 20.00% |
Alasdair G. Kergon | 1 | 3.03% | 1 | 20.00% |
Total | 33 | 100.00% | 5 | 100.00% |
static void start_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;
struct bio *bio = io->bio;
int cpu;
int rw = bio_data_dir(bio);
io->start_time = jiffies;
cpu = part_stat_lock();
part_round_stats(md->queue, cpu, &dm_disk(md)->part0);
part_stat_unlock();
atomic_set(&dm_disk(md)->part0.in_flight[rw],
atomic_inc_return(&md->pending[rw]));
if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio_data_dir(bio),
bio->bi_iter.bi_sector, bio_sectors(bio),
false, 0, &io->stats_aux);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 105 | 72.92% | 4 | 44.44% |
Kiyoshi Ueda | 26 | 18.06% | 1 | 11.11% |
Mikulas Patocka | 7 | 4.86% | 2 | 22.22% |
Jens Axboe | 4 | 2.78% | 1 | 11.11% |
Alasdair G. Kergon | 2 | 1.39% | 1 | 11.11% |
Total | 144 | 100.00% | 9 | 100.00% |
static void end_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;
struct bio *bio = io->bio;
unsigned long duration = jiffies - io->start_time;
int pending;
int rw = bio_data_dir(bio);
generic_end_io_acct(md->queue, rw, &dm_disk(md)->part0, io->start_time);
if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio_data_dir(bio),
bio->bi_iter.bi_sector, bio_sectors(bio),
true, duration, &io->stats_aux);
/*
* After this is decremented the bio must not be touched if it is
* a flush.
*/
pending = atomic_dec_return(&md->pending[rw]);
atomic_set(&dm_disk(md)->part0.in_flight[rw], pending);
pending += atomic_read(&md->pending[rw^0x1]);
/* nudge anyone waiting on suspend queue */
if (!pending)
wake_up(&md->wait);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 141 | 79.21% | 7 | 58.33% |
Kiyoshi Ueda | 22 | 12.36% | 1 | 8.33% |
Alasdair G. Kergon | 7 | 3.93% | 1 | 8.33% |
Jens Axboe | 4 | 2.25% | 1 | 8.33% |
Mikulas Patocka | 4 | 2.25% | 2 | 16.67% |
Total | 178 | 100.00% | 12 | 100.00% |
/*
* Add the bio to the list of deferred io.
*/
static void queue_io(struct mapped_device *md, struct bio *bio)
{
unsigned long flags;
spin_lock_irqsave(&md->deferred_lock, flags);
bio_list_add(&md->deferred, bio);
spin_unlock_irqrestore(&md->deferred_lock, flags);
queue_work(md->wq, &md->work);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 45 | 72.58% | 3 | 33.33% |
Alasdair G. Kergon | 10 | 16.13% | 3 | 33.33% |
Mikulas Patocka | 7 | 11.29% | 3 | 33.33% |
Total | 62 | 100.00% | 9 | 100.00% |
/*
* Everyone (including functions in this file), should use this
* function to access the md->map field, and make sure they call
* dm_put_live_table() when finished.
*/
struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier)
{
*srcu_idx = srcu_read_lock(&md->io_barrier);
return srcu_dereference(md->map, &md->io_barrier);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 42 | 91.30% | 4 | 66.67% |
Mikulas Patocka | 3 | 6.52% | 1 | 16.67% |
Alasdair G. Kergon | 1 | 2.17% | 1 | 16.67% |
Total | 46 | 100.00% | 6 | 100.00% |
void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier)
{
srcu_read_unlock(&md->io_barrier, srcu_idx);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 29 | 100.00% | 4 | 100.00% |
Total | 29 | 100.00% | 4 | 100.00% |
void dm_sync_table(struct mapped_device *md)
{
synchronize_srcu(&md->io_barrier);
synchronize_rcu_expedited();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 21 | 100.00% | 2 | 100.00% |
Total | 21 | 100.00% | 2 | 100.00% |
/*
* A fast alternative to dm_get_live_table/dm_put_live_table.
* The caller must not block between these two functions.
*/
static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU)
{
rcu_read_lock();
return rcu_dereference(md->map);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 28 | 100.00% | 2 | 100.00% |
Total | 28 | 100.00% | 2 | 100.00% |
static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU)
{
rcu_read_unlock();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 18 | 100.00% | 2 | 100.00% |
Total | 18 | 100.00% | 2 | 100.00% |
/*
* Open a table device so we can use it as a map destination.
*/
static int open_table_device(struct table_device *td, dev_t dev,
struct mapped_device *md)
{
static char *_claim_ptr = "I belong to device-mapper";
struct block_device *bdev;
int r;
BUG_ON(td->dm_dev.bdev);
bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _claim_ptr);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
r = bd_link_disk_holder(bdev, dm_disk(md));
if (r) {
blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL);
return r;
}
td->dm_dev.bdev = bdev;
td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 100 | 75.19% | 4 | 50.00% |
Dan J Williams | 15 | 11.28% | 1 | 12.50% |
Kiyoshi Ueda | 10 | 7.52% | 1 | 12.50% |
Alasdair G. Kergon | 8 | 6.02% | 2 | 25.00% |
Total | 133 | 100.00% | 8 | 100.00% |
/*
* Close a table device that we've been using.
*/
static void close_table_device(struct table_device *td, struct mapped_device *md)
{
if (!td->dm_dev.bdev)
return;
bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md));
blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL);
put_dax(td->dm_dev.dax_dev);
td->dm_dev.bdev = NULL;
td->dm_dev.dax_dev = NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 42 | 51.22% | 4 | 50.00% |
Dan J Williams | 17 | 20.73% | 1 | 12.50% |
Mikulas Patocka | 13 | 15.85% | 2 | 25.00% |
Kiyoshi Ueda | 10 | 12.20% | 1 | 12.50% |
Total | 82 | 100.00% | 8 | 100.00% |
static struct table_device *find_table_device(struct list_head *l, dev_t dev,
fmode_t mode) {
struct table_device *td;
list_for_each_entry(td, l, list)
if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode)
return td;
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 57 | 98.28% | 2 | 66.67% |
Kiyoshi Ueda | 1 | 1.72% | 1 | 33.33% |
Total | 58 | 100.00% | 3 | 100.00% |
int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
struct dm_dev **result) {
int r;
struct table_device *td;
mutex_lock(&md->table_devices_lock);
td = find_table_device(&md->table_devices, dev, mode);
if (!td) {
td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id);
if (!td) {
mutex_unlock(&md->table_devices_lock);
return -ENOMEM;
}
td->dm_dev.mode = mode;
td->dm_dev.bdev = NULL;
if ((r = open_table_device(td, dev, md))) {
mutex_unlock(&md->table_devices_lock);
kfree(td);
return r;
}
format_dev_t(td->dm_dev.name, dev);
atomic_set(&td->count, 0);
list_add(&td->list, &md->table_devices);
}
atomic_inc(&td->count);
mutex_unlock(&md->table_devices_lock);
*result = &td->dm_dev;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 129 | 62.93% | 4 | 33.33% |
Kiyoshi Ueda | 51 | 24.88% | 2 | 16.67% |
Alasdair G. Kergon | 15 | 7.32% | 1 | 8.33% |
Tejun Heo | 4 | 1.95% | 2 | 16.67% |
Michael Christie | 3 | 1.46% | 1 | 8.33% |
Kent Overstreet | 2 | 0.98% | 1 | 8.33% |
Mikulas Patocka | 1 | 0.49% | 1 | 8.33% |
Total | 205 | 100.00% | 12 | 100.00% |
EXPORT_SYMBOL_GPL(dm_get_table_device);
void dm_put_table_device(struct mapped_device *md, struct dm_dev *d)
{
struct table_device *td = container_of(d, struct table_device, dm_dev);
mutex_lock(&md->table_devices_lock);
if (atomic_dec_and_test(&td->count)) {
close_table_device(td, md);
list_del(&td->list);
kfree(td);
}
mutex_unlock(&md->table_devices_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 43 | 55.13% | 2 | 33.33% |
Mike Snitzer | 32 | 41.03% | 2 | 33.33% |
Tejun Heo | 2 | 2.56% | 1 | 16.67% |
Mikulas Patocka | 1 | 1.28% | 1 | 16.67% |
Total | 78 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL(dm_put_table_device);
static void free_table_devices(struct list_head *devices)
{
struct list_head *tmp, *next;
list_for_each_safe(tmp, next, devices) {
struct table_device *td = list_entry(tmp, struct table_device, list);
DMWARN("dm_destroy: %s still exists with %d references",
td->dm_dev.name, atomic_read(&td->count));
kfree(td);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 39 | 57.35% | 1 | 33.33% |
Kiyoshi Ueda | 25 | 36.76% | 1 | 33.33% |
Mikulas Patocka | 4 | 5.88% | 1 | 33.33% |
Total | 68 | 100.00% | 3 | 100.00% |
/*
* Get the geometry associated with a dm device
*/
int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo)
{
*geo = md->geometry;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 13 | 52.00% | 1 | 50.00% |
Kiyoshi Ueda | 12 | 48.00% | 1 | 50.00% |
Total | 25 | 100.00% | 2 | 100.00% |
/*
* Set the geometry of a device.
*/
int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo)
{
sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors;
if (geo->start > sz) {
DMWARN("Start sector is beyond the geometry limits.");
return -EINVAL;
}
md->geometry = *geo;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 36 | 58.06% | 1 | 16.67% |
Kiyoshi Ueda | 18 | 29.03% | 2 | 33.33% |
Jens Axboe | 4 | 6.45% | 1 | 16.67% |
Keith Busch | 3 | 4.84% | 1 | 16.67% |
Christoph Hellwig | 1 | 1.61% | 1 | 16.67% |
Total | 62 | 100.00% | 6 | 100.00% |
/*-----------------------------------------------------------------
* CRUD START:
* A more elegant soln is in the works that uses the queue
* merge fn, unfortunately there are a couple of changes to
* the block layer that I want to make for this. So in the
* interests of getting something for people to use I give
* you this clearly demarcated crap.
*---------------------------------------------------------------*/
static int __noflush_suspending(struct mapped_device *md)
{
return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 16 | 72.73% | 1 | 50.00% |
Mike Snitzer | 6 | 27.27% | 1 | 50.00% |
Total | 22 | 100.00% | 2 | 100.00% |
/*
* Decrements the number of outstanding ios that a bio has been
* cloned into, completing the original io if necc.
*/
static void dec_pending(struct dm_io *io, blk_status_t error)
{
unsigned long flags;
blk_status_t io_error;
struct bio *bio;
struct mapped_device *md = io->md;
/* Push-back supersedes any I/O errors */
if (unlikely(error)) {
spin_lock_irqsave(&io->endio_lock, flags);
if (!(io->status == BLK_STS_DM_REQUEUE &&
__noflush_suspending(md)))
io->status = error;
spin_unlock_irqrestore(&io->endio_lock, flags);
}
if (atomic_dec_and_test(&io->io_count)) {
if (io->status == BLK_STS_DM_REQUEUE) {
/*
* Target requested pushing back the I/O.
*/
spin_lock_irqsave(&md->deferred_lock, flags);
if (__noflush_suspending(md))
bio_list_add_head(&md->deferred, io->bio);
else
/* noflush suspend was interrupted. */
io->status = BLK_STS_IOERR;
spin_unlock_irqrestore(&md->deferred_lock, flags);
}
io_error = io->status;
bio = io->bio;
end_io_acct(io);
free_io(md, io);
if (io_error == BLK_STS_DM_REQUEUE)
return;
if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) {
/*
* Preflush done for flush with data, reissue
* without REQ_PREFLUSH.
*/
bio->bi_opf &= ~REQ_PREFLUSH;
queue_io(md, bio);
} else {
/* done with normal IO or empty flush */
bio->bi_status = io_error;
bio_endio(bio);
}
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 190 | 80.51% | 5 | 41.67% |
Kiyoshi Ueda | 28 | 11.86% | 2 | 16.67% |
Christoph Hellwig | 13 | 5.51% | 1 | 8.33% |
Jens Axboe | 2 | 0.85% | 1 | 8.33% |
Alan Cox | 1 | 0.42% | 1 | 8.33% |
Joe Thornber | 1 | 0.42% | 1 | 8.33% |
Keith Busch | 1 | 0.42% | 1 | 8.33% |
Total | 236 | 100.00% | 12 | 100.00% |
void disable_write_same(struct mapped_device *md)
{
struct queue_limits *limits = dm_get_queue_limits(md);
/* device doesn't really support WRITE SAME, disable it */
limits->max_write_same_sectors = 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 22 | 81.48% | 1 | 50.00% |
Keith Busch | 5 | 18.52% | 1 | 50.00% |
Total | 27 | 100.00% | 2 | 100.00% |
void disable_write_zeroes(struct mapped_device *md)
{
struct queue_limits *limits = dm_get_queue_limits(md);
/* device doesn't really support WRITE ZEROES, disable it */
limits->max_write_zeroes_sectors = 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 27 | 100.00% | 1 | 100.00% |
Total | 27 | 100.00% | 1 | 100.00% |
static void clone_endio(struct bio *bio)
{
blk_status_t error = bio->bi_status;
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
struct dm_io *io = tio->io;
struct mapped_device *md = tio->io->md;
dm_endio_fn endio = tio->ti->type->end_io;
if (unlikely(error == BLK_STS_TARGET)) {
if (bio_op(bio) == REQ_OP_WRITE_SAME &&
!bio->bi_disk->queue->limits.max_write_same_sectors)
disable_write_same(md);
if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
!bio->bi_disk->queue->limits.max_write_zeroes_sectors)
disable_write_zeroes(md);
}
if (endio) {
int r = endio(tio->ti, bio, &error);
switch (r) {
case DM_ENDIO_REQUEUE:
error = BLK_STS_DM_REQUEUE;
/*FALLTHRU*/
case DM_ENDIO_DONE:
break;
case DM_ENDIO_INCOMPLETE:
/* The target will handle the io */
return;
default:
DMWARN("unimplemented target endio return value: %d", r);
BUG();
}
}
free_tio(tio);
dec_pending(io, error);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 93 | 48.44% | 4 | 36.36% |
Mike Snitzer | 74 | 38.54% | 5 | 45.45% |
Kiyoshi Ueda | 20 | 10.42% | 1 | 9.09% |
Keith Busch | 5 | 2.60% | 1 | 9.09% |
Total | 192 | 100.00% | 11 | 100.00% |
/*
* Return maximum size of I/O possible at the supplied sector up to the current
* target boundary.
*/
static sector_t max_io_len_target_boundary(sector_t sector, struct dm_target *ti)
{
sector_t target_offset = dm_target_offset(ti, sector);
return ti->len - target_offset;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 31 | 100.00% | 2 | 100.00% |
Total | 31 | 100.00% | 2 | 100.00% |
static sector_t max_io_len(sector_t sector, struct dm_target *ti)
{
sector_t len = max_io_len_target_boundary(sector, ti);
sector_t offset, max_len;
/*
* Does the target need to split even further?
*/
if (ti->max_io_len) {
offset = dm_target_offset(ti, sector);
if (unlikely(ti->max_io_len & (ti->max_io_len - 1)))
max_len = sector_div(offset, ti->max_io_len);
else
max_len = offset & (ti->max_io_len - 1);
max_len = ti->max_io_len - max_len;
if (len > max_len)
len = max_len;
}
return len;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 98 | 89.91% | 3 | 60.00% |
Kiyoshi Ueda | 9 | 8.26% | 1 | 20.00% |
Keith Busch | 2 | 1.83% | 1 | 20.00% |
Total | 109 | 100.00% | 5 | 100.00% |
int dm_set_target_max_io_len(struct dm_target *ti, sector_t len)
{
if (len > UINT_MAX) {
DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)",
(unsigned long long)len, UINT_MAX);
ti->error = "Maximum size of target IO is too large";
return -EINVAL;
}
ti->max_io_len = (uint32_t) len;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 30 | 52.63% | 1 | 14.29% |
Kiyoshi Ueda | 11 | 19.30% | 3 | 42.86% |
Alan Cox | 11 | 19.30% | 1 | 14.29% |
Mikulas Patocka | 4 | 7.02% | 1 | 14.29% |
Milan Broz | 1 | 1.75% | 1 | 14.29% |
Total | 57 | 100.00% | 7 | 100.00% |
EXPORT_SYMBOL_GPL(dm_set_target_max_io_len);
static struct dm_target *dm_dax_get_live_target(struct mapped_device *md,
sector_t sector, int *srcu_idx)
{
struct dm_table *map;
struct dm_target *ti;
map = dm_get_live_table(md, srcu_idx);
if (!map)
return NULL;
ti = dm_table_find_target(map, sector);
if (!dm_target_is_valid(ti))
return NULL;
return ti;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 62 | 88.57% | 1 | 33.33% |
Kiyoshi Ueda | 5 | 7.14% | 1 | 33.33% |
Toshi Kani | 3 | 4.29% | 1 | 33.33% |
Total | 70 | 100.00% | 3 | 100.00% |
static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
long nr_pages, void **kaddr, pfn_t *pfn)
{
struct mapped_device *md = dax_get_private(dax_dev);
sector_t sector = pgoff * PAGE_SECTORS;
struct dm_target *ti;
long len, ret = -EIO;
int srcu_idx;
ti = dm_dax_get_live_target(md, sector, &srcu_idx);
if (!ti)
goto out;
if (!ti->type->direct_access)
goto out;
len = max_io_len(sector, ti) / PAGE_SECTORS;
if (len < 1)
goto out;
nr_pages = min(len, nr_pages);
if (ti->type->direct_access)
ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn);
out:
dm_put_live_table(md, srcu_idx);
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Toshi Kani | 61 | 38.36% | 1 | 8.33% |
Dan J Williams | 53 | 33.33% | 2 | 16.67% |
Mike Snitzer | 16 | 10.06% | 3 | 25.00% |
Kiyoshi Ueda | 13 | 8.18% | 2 | 16.67% |
Alan Cox | 7 | 4.40% | 1 | 8.33% |
Jun'ichi Nomura | 4 | 2.52% | 1 | 8.33% |
Joe Thornber | 3 | 1.89% | 1 | 8.33% |
Keith Busch | 2 | 1.26% | 1 | 8.33% |
Total | 159 | 100.00% | 12 | 100.00% |
static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
void *addr, size_t bytes, struct iov_iter *i)
{
struct mapped_device *md = dax_get_private(dax_dev);
sector_t sector = pgoff * PAGE_SECTORS;
struct dm_target *ti;
long ret = 0;
int srcu_idx;
ti = dm_dax_get_live_target(md, sector, &srcu_idx);
if (!ti)
goto out;
if (!ti->type->dax_copy_from_iter) {
ret = copy_from_iter(addr, bytes, i);
goto out;
}
ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i);
out:
dm_put_live_table(md, srcu_idx);
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 132 | 100.00% | 1 | 100.00% |
Total | 132 | 100.00% | 1 | 100.00% |
/*
* A target may call dm_accept_partial_bio only from the map routine. It is
* allowed for all bio types except REQ_PREFLUSH.
*
* dm_accept_partial_bio informs the dm that the target only wants to process
* additional n_sectors sectors of the bio and the rest of the data should be
* sent in a next bio.
*
* A diagram that explains the arithmetics:
* +--------------------+---------------+-------+
* | 1 | 2 | 3 |
* +--------------------+---------------+-------+
*
* <-------------- *tio->len_ptr --------------->
* <------- bi_size ------->
* <-- n_sectors -->
*
* Region 1 was already iterated over with bio_advance or similar function.
* (it may be empty if the target doesn't use bio_advance)
* Region 2 is the remaining bio size that the target wants to process.
* (it may be empty if region 1 is non-empty, although there is no reason
* to make it empty)
* The target requires that region 3 is to be sent in the next bio.
*
* If the target wants to receive multiple copies of the bio (via num_*bios, etc),
* the partially processed part (the sum of regions 1+2) must be the same for all
* copies of the bio.
*/
void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
{
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT;
BUG_ON(bio->bi_opf & REQ_PREFLUSH);
BUG_ON(bi_size > *tio->len_ptr);
BUG_ON(n_sectors > bi_size);
*tio->len_ptr -= bi_size - n_sectors;
bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 62 | 73.81% | 6 | 60.00% |
Keith Busch | 18 | 21.43% | 2 | 20.00% |
Alan Cox | 3 | 3.57% | 1 | 10.00% |
Jens Axboe | 1 | 1.19% | 1 | 10.00% |
Total | 84 | 100.00% | 10 | 100.00% |
EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
/*
* The zone descriptors obtained with a zone report indicate
* zone positions within the target device. The zone descriptors
* must be remapped to match their position within the dm device.
* A target may call dm_remap_zone_report after completion of a
* REQ_OP_ZONE_REPORT bio to remap the zone descriptors obtained
* from the target device mapping to the dm device.
*/
void dm_remap_zone_report(struct dm_target *ti, struct bio *bio, sector_t start)
{
#ifdef CONFIG_BLK_DEV_ZONED
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
struct bio *report_bio = tio->io->bio;
struct blk_zone_report_hdr *hdr = NULL;
struct blk_zone *zone;
unsigned int nr_rep = 0;
unsigned int ofst;
struct bio_vec bvec;
struct bvec_iter iter;
void *addr;
if (bio->bi_status)
return;
/*
* Remap the start sector of the reported zones. For sequential zones,
* also remap the write pointer position.
*/
bio_for_each_segment(bvec, report_bio, iter) {
addr = kmap_atomic(bvec.bv_page);
/* Remember the report header in the first page */
if (!hdr) {
hdr = addr;
ofst = sizeof(struct blk_zone_report_hdr);
} else
ofst = 0;
/* Set zones start sector */
while (hdr->nr_zones && ofst < bvec.bv_len) {
zone = addr + ofst;
if (zone->start >= start + ti->len) {
hdr->nr_zones = 0;
break;
}
zone->start = zone->start + ti->begin - start;
if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) {
if (zone->cond == BLK_ZONE_COND_FULL)
zone->wp = zone->start + zone->len;
else if (zone->cond == BLK_ZONE_COND_EMPTY)
zone->wp = zone->start;
else
zone->wp = zone->wp + ti->begin - start;
}
ofst += sizeof(struct blk_zone);
hdr->nr_zones--;
nr_rep++;
}
if (addr != hdr)
kunmap_atomic(addr);
if (!hdr->nr_zones)
break;
}
if (hdr) {
hdr->nr_zones = nr_rep;
kunmap_atomic(hdr);
}
bio_advance(report_bio, report_bio->bi_iter.bi_size);
#else /* !CONFIG_BLK_DEV_ZONED */
bio->bi_status = BLK_STS_NOTSUPP;
#endif
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Damien Le Moal | 325 | 100.00% | 1 | 100.00% |
Total | 325 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(dm_remap_zone_report);
/*
* Flush current->bio_list when the target map method blocks.
* This fixes deadlocks in snapshot and possibly in other targets.
*/
struct dm_offload {
struct blk_plug plug;
struct blk_plug_cb cb;
};
static void flush_current_bio_list(struct blk_plug_cb *cb, bool from_schedule)
{
struct dm_offload *o = container_of(cb, struct dm_offload, cb);
struct bio_list list;
struct bio *bio;
int i;
INIT_LIST_HEAD(&o->cb.list);
if (unlikely(!current->bio_list))
return;
for (i = 0; i < 2; i++) {
list = current->bio_list[i];
bio_list_init(¤t->bio_list[i]);
while ((bio = bio_list_pop(&list))) {
struct bio_set *bs = bio->bi_pool;
if (unlikely(!bs) || bs == fs_bio_set ||
!bs->rescue_workqueue) {
bio_list_add(¤t->bio_list[i], bio);
continue;
}
spin_lock(&bs->rescue_lock);
bio_list_add(&bs->rescue_list, bio);
queue_work(bs->rescue_workqueue, &bs->rescue_work);
spin_unlock(&bs->rescue_lock);
}
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 157 | 82.20% | 1 | 33.33% |
Neil Brown | 34 | 17.80% | 2 | 66.67% |
Total | 191 | 100.00% | 3 | 100.00% |
static void dm_offload_start(struct dm_offload *o)
{
blk_start_plug(&o->plug);
o->cb.callback = flush_current_bio_list;
list_add(&o->cb.list, ¤t->plug->cb_list);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 44 | 100.00% | 1 | 100.00% |
Total | 44 | 100.00% | 1 | 100.00% |
static void dm_offload_end(struct dm_offload *o)
{
list_del(&o->cb.list);
blk_finish_plug(&o->plug);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 29 | 100.00% | 1 | 100.00% |
Total | 29 | 100.00% | 1 | 100.00% |
static void __map_bio(struct dm_target_io *tio)
{
int r;
sector_t sector;
struct dm_offload o;
struct bio *clone = &tio->clone;
struct dm_target *ti = tio->ti;
clone->bi_end_io = clone_endio;
/*
* Map the clone. If r == 0 we don't need to do
* anything, the target has assumed ownership of
* this io.
*/
atomic_inc(&tio->io->io_count);
sector = clone->bi_iter.bi_sector;
dm_offload_start(&o);
r = ti->type->map(ti, clone);
dm_offload_end(&o);
switch (r) {
case DM_MAPIO_SUBMITTED:
break;
case DM_MAPIO_REMAPPED:
/* the bio has been remapped so dispatch it */
trace_block_bio_remap(clone->bi_disk->queue, clone,
bio_dev(tio->io->bio), sector);
generic_make_request(clone);
break;
case DM_MAPIO_KILL:
dec_pending(tio->io, BLK_STS_IOERR);
free_tio(tio);
break;
case DM_MAPIO_REQUEUE:
dec_pending(tio->io, BLK_STS_DM_REQUEUE);
free_tio(tio);
break;
default:
DMWARN("unimplemented target map return value: %d", r);
BUG();
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 71 | 39.66% | 6 | 40.00% |
Mikulas Patocka | 39 | 21.79% | 2 | 13.33% |
Christoph Hellwig | 38 | 21.23% | 3 | 20.00% |
Kiyoshi Ueda | 20 | 11.17% | 1 | 6.67% |
Jun'ichi Nomura | 4 | 2.23% | 1 | 6.67% |
Keith Busch | 4 | 2.23% | 1 | 6.67% |
Joe Thornber | 3 | 1.68% | 1 | 6.67% |
Total | 179 | 100.00% | 15 | 100.00% |
struct clone_info {
struct mapped_device *md;
struct dm_table *map;
struct bio *bio;
struct dm_io *io;
sector_t sector;
unsigned sector_count;
};
static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len)
{
bio->bi_iter.bi_sector = sector;
bio->bi_iter.bi_size = to_bytes(len);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 36 | 100.00% | 2 | 100.00% |
Total | 36 | 100.00% | 2 | 100.00% |
/*
* Creates a bio that consists of range of complete bvecs.
*/
static int clone_bio(struct dm_target_io *tio, struct bio *bio,
sector_t sector, unsigned len)
{
struct bio *clone = &tio->clone;
__bio_clone_fast(clone, bio);
if (unlikely(bio_integrity(bio) != NULL)) {
int r;
if (unlikely(!dm_target_has_integrity(tio->ti->type) &&
!dm_target_passes_integrity(tio->ti->type))) {
DMWARN("%s: the target %s doesn't support integrity data.",
dm_device_name(tio->io->md),
tio->ti->type->name);
return -EIO;
}
r = bio_integrity_clone(clone, bio, GFP_NOIO);
if (r < 0)
return r;
}
if (bio_op(bio) != REQ_OP_ZONE_REPORT)
bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
clone->bi_iter.bi_size = to_bytes(len);
if (unlikely(bio_integrity(bio) != NULL))
bio_integrity_trim(clone);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 83 | 44.86% | 5 | 38.46% |
Mikulas Patocka | 69 | 37.30% | 2 | 15.38% |
Damien Le Moal | 9 | 4.86% | 1 | 7.69% |
Milan Broz | 8 | 4.32% | 1 | 7.69% |
Kiyoshi Ueda | 7 | 3.78% | 2 | 15.38% |
Keith Busch | 5 | 2.70% | 1 | 7.69% |
Tejun Heo | 4 | 2.16% | 1 | 7.69% |
Total | 185 | 100.00% | 13 | 100.00% |
static struct dm_target_io *alloc_tio(struct clone_info *ci,
struct dm_target *ti,
unsigned target_bio_nr)
{
struct dm_target_io *tio;
struct bio *clone;
clone = bio_alloc_bioset(GFP_NOIO, 0, ci->md->bs);
tio = container_of(clone, struct dm_target_io, clone);
tio->io = ci->io;
tio->ti = ti;
tio->target_bio_nr = target_bio_nr;
return tio;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 65 | 80.25% | 5 | 50.00% |
Keith Busch | 9 | 11.11% | 1 | 10.00% |
Kiyoshi Ueda | 6 | 7.41% | 3 | 30.00% |
Milan Broz | 1 | 1.23% | 1 | 10.00% |
Total | 81 | 100.00% | 10 | 100.00% |
static void __clone_and_map_simple_bio(struct clone_info *ci,
struct dm_target *ti,
unsigned target_bio_nr, unsigned *len)
{
struct dm_target_io *tio = alloc_tio(ci, ti, target_bio_nr);
struct bio *clone = &tio->clone;
tio->len_ptr = len;
__bio_clone_fast(clone, ci->bio);
if (len)
bio_setup_sector(clone, ci->sector, *len);
__map_bio(tio);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 52 | 62.65% | 3 | 50.00% |
Andrew Morton | 20 | 24.10% | 1 | 16.67% |
Mikulas Patocka | 9 | 10.84% | 1 | 16.67% |
Kiyoshi Ueda | 2 | 2.41% | 1 | 16.67% |
Total | 83 | 100.00% | 6 | 100.00% |
static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
unsigned num_bios, unsigned *len)
{
unsigned target_bio_nr;
for (target_bio_nr = 0; target_bio_nr < num_bios; target_bio_nr++)
__clone_and_map_simple_bio(ci, ti, target_bio_nr, len);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 40 | 80.00% | 2 | 66.67% |
Alan Cox | 10 | 20.00% | 1 | 33.33% |
Total | 50 | 100.00% | 3 | 100.00% |
static int __send_empty_flush(struct clone_info *ci)
{
unsigned target_nr = 0;
struct dm_target *ti;
BUG_ON(bio_has_data(ci->bio));
while ((ti = dm_table_get_target(ci->map, target_nr++)))
__send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 41 | 65.08% | 2 | 25.00% |
Alan Cox | 12 | 19.05% | 2 | 25.00% |
Kevin Corry | 7 | 11.11% | 2 | 25.00% |
Tejun Heo | 2 | 3.17% | 1 | 12.50% |
Jeff Mahoney | 1 | 1.59% | 1 | 12.50% |
Total | 63 | 100.00% | 8 | 100.00% |
static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti,
sector_t sector, unsigned *len)
{
struct bio *bio = ci->bio;
struct dm_target_io *tio;
unsigned target_bio_nr;
unsigned num_target_bios = 1;
int r = 0;
/*
* Does the target want to receive duplicate copies of the bio?
*/
if (bio_data_dir(bio) == WRITE && ti->num_write_bios)
num_target_bios = ti->num_write_bios(ti, bio);
for (target_bio_nr = 0; target_bio_nr < num_target_bios; target_bio_nr++) {
tio = alloc_tio(ci, ti, target_bio_nr);
tio->len_ptr = len;
r = clone_bio(tio, bio, sector, *len);
if (r < 0) {
free_tio(tio);
break;
}
__map_bio(tio);
}
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 84 | 58.74% | 4 | 26.67% |
Milan Broz | 12 | 8.39% | 1 | 6.67% |
Alan Cox | 11 | 7.69% | 2 | 13.33% |
Tejun Heo | 10 | 6.99% | 1 | 6.67% |
Kiyoshi Ueda | 10 | 6.99% | 3 | 20.00% |
Keith Busch | 9 | 6.29% | 1 | 6.67% |
Kevin Corry | 6 | 4.20% | 2 | 13.33% |
Joe Thornber | 1 | 0.70% | 1 | 6.67% |
Total | 143 | 100.00% | 15 | 100.00% |
typedef unsigned (*get_num_bios_fn)(struct dm_target *ti);
static unsigned get_num_discard_bios(struct dm_target *ti)
{
return ti->num_discard_bios;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 11 | 68.75% | 1 | 50.00% |
Mikulas Patocka | 5 | 31.25% | 1 | 50.00% |
Total | 16 | 100.00% | 2 | 100.00% |
static unsigned get_num_write_same_bios(struct dm_target *ti)
{
return ti->num_write_same_bios;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 15 | 93.75% | 3 | 75.00% |
Mikulas Patocka | 1 | 6.25% | 1 | 25.00% |
Total | 16 | 100.00% | 4 | 100.00% |
static unsigned get_num_write_zeroes_bios(struct dm_target *ti)
{
return ti->num_write_zeroes_bios;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 16 | 100.00% | 1 | 100.00% |
Total | 16 | 100.00% | 1 | 100.00% |
typedef bool (*is_split_required_fn)(struct dm_target *ti);
static bool is_split_required_for_discard(struct dm_target *ti)
{
return ti->split_discard_bios;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 16 | 100.00% | 3 | 100.00% |
Total | 16 | 100.00% | 3 | 100.00% |
static int __send_changing_extent_only(struct clone_info *ci,
get_num_bios_fn get_num_bios,
is_split_required_fn is_split_required)
{
struct dm_target *ti;
unsigned len;
unsigned num_bios;
do {
ti = dm_table_find_target(ci->map, ci->sector);
if (!dm_target_is_valid(ti))
return -EIO;
/*
* Even though the device advertised support for this type of
* request, that does not mean every target supports it, and
* reconfiguration might also have changed that since the
* check was performed.
*/
num_bios = get_num_bios ? get_num_bios(ti) : 0;
if (!num_bios)
return -EOPNOTSUPP;
if (is_split_required && !is_split_required(ti))
len = min((sector_t)ci->sector_count, max_io_len_target_boundary(ci->sector, ti));
else
len = min((sector_t)ci->sector_count, max_io_len(ci->sector, ti));
__send_duplicate_bios(ci, ti, num_bios, &len);
ci->sector += len;
} while (ci->sector_count -= len);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 142 | 88.75% | 3 | 33.33% |
Andrew Morton | 8 | 5.00% | 1 | 11.11% |
Alan Cox | 7 | 4.38% | 2 | 22.22% |
Chandra Seetharaman | 1 | 0.62% | 1 | 11.11% |
Mikulas Patocka | 1 | 0.62% | 1 | 11.11% |
Kiyoshi Ueda | 1 | 0.62% | 1 | 11.11% |
Total | 160 | 100.00% | 9 | 100.00% |
static int __send_discard(struct clone_info *ci)
{
return __send_changing_extent_only(ci, get_num_discard_bios,
is_split_required_for_discard);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 13 | 61.90% | 2 | 28.57% |
Alan Cox | 5 | 23.81% | 2 | 28.57% |
Kevin Corry | 2 | 9.52% | 2 | 28.57% |
Tejun Heo | 1 | 4.76% | 1 | 14.29% |
Total | 21 | 100.00% | 7 | 100.00% |
static int __send_write_same(struct clone_info *ci)
{
return __send_changing_extent_only(ci, get_num_write_same_bios, NULL);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 19 | 90.48% | 2 | 50.00% |
Tejun Heo | 1 | 4.76% | 1 | 25.00% |
Alan Cox | 1 | 4.76% | 1 | 25.00% |
Total | 21 | 100.00% | 4 | 100.00% |
static int __send_write_zeroes(struct clone_info *ci)
{
return __send_changing_extent_only(ci, get_num_write_zeroes_bios, NULL);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 21 | 100.00% | 1 | 100.00% |
Total | 21 | 100.00% | 1 | 100.00% |
/*
* Select the correct strategy for processing a non-flush bio.
*/
static int __split_and_process_non_flush(struct clone_info *ci)
{
struct bio *bio = ci->bio;
struct dm_target *ti;
unsigned len;
int r;
if (unlikely(bio_op(bio) == REQ_OP_DISCARD))
return __send_discard(ci);
else if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME))
return __send_write_same(ci);
else if (unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES))
return __send_write_zeroes(ci);
ti = dm_table_find_target(ci->map, ci->sector);
if (!dm_target_is_valid(ti))
return -EIO;
if (bio_op(bio) == REQ_OP_ZONE_REPORT)
len = ci->sector_count;
else
len = min_t(sector_t, max_io_len(ci->sector, ti),
ci->sector_count);
r = __clone_and_map_data_bio(ci, ti, ci->sector, &len);
if (r < 0)
return r;
ci->sector += len;
ci->sector_count -= len;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 91 | 48.40% | 5 | 29.41% |
Alan Cox | 31 | 16.49% | 2 | 11.76% |
Christoph Hellwig | 19 | 10.11% | 1 | 5.88% |
Damien Le Moal | 16 | 8.51% | 1 | 5.88% |
Mikulas Patocka | 8 | 4.26% | 1 | 5.88% |
Kevin Corry | 6 | 3.19% | 2 | 11.76% |
Alasdair G. Kergon | 5 | 2.66% | 2 | 11.76% |
Jeff Mahoney | 4 | 2.13% | 1 | 5.88% |
Joe Thornber | 4 | 2.13% | 1 | 5.88% |
Tejun Heo | 4 | 2.13% | 1 | 5.88% |
Total | 188 | 100.00% | 17 | 100.00% |
/*
* Entry point to split a bio into clones and submit them to the targets.
*/
static void __split_and_process_bio(struct mapped_device *md,
struct dm_table *map, struct bio *bio)
{
struct clone_info ci;
int error = 0;
if (unlikely(!map)) {
bio_io_error(bio);
return;
}
ci.map = map;
ci.md = md;
ci.io = alloc_io(md);
ci.io->status = 0;
atomic_set(&ci.io->io_count, 1);
ci.io->bio = bio;
ci.io->md = md;
spin_lock_init(&ci.io->endio_lock);
ci.sector = bio->bi_iter.bi_sector;
start_io_acct(ci.io);
if (bio->bi_opf & REQ_PREFLUSH) {
ci.bio = &ci.md->flush_bio;
ci.sector_count = 0;
error = __send_empty_flush(&ci);
/* dec_pending submits any data associated with flush */
} else if (bio_op(bio) == REQ_OP_ZONE_RESET) {
ci.bio = bio;
ci.sector_count = 0;
error = __split_and_process_non_flush(&ci);
} else {
ci.bio = bio;
ci.sector_count = bio_sectors(bio);
while (ci.sector_count && !error)
error = __split_and_process_non_flush(&ci);
}
/* drop the extra reference count */
dec_pending(ci.io, errno_to_blk_status(error));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 147 | 59.76% | 5 | 22.73% |
Damien Le Moal | 32 | 13.01% | 1 | 4.55% |
Mike Anderson | 15 | 6.10% | 1 | 4.55% |
Alan Cox | 9 | 3.66% | 1 | 4.55% |
Jens Axboe | 9 | 3.66% | 2 | 9.09% |
Mikulas Patocka | 5 | 2.03% | 1 | 4.55% |
Jeff Mahoney | 5 | 2.03% | 1 | 4.55% |
Andrew Morton | 5 | 2.03% | 2 | 9.09% |
Benjamin Marzinski | 5 | 2.03% | 1 | 4.55% |
Alasdair G. Kergon | 4 | 1.63% | 2 | 9.09% |
Nikanth Karthikesan | 3 | 1.22% | 1 | 4.55% |
Kiyoshi Ueda | 3 | 1.22% | 2 | 9.09% |
Bart Van Assche | 3 | 1.22% | 1 | 4.55% |
Christoph Hellwig | 1 | 0.41% | 1 | 4.55% |
Total | 246 | 100.00% | 22 | 100.00% |
/*-----------------------------------------------------------------
* CRUD END
*---------------------------------------------------------------*/
/*
* The request function that just remaps the bio built up by
* dm_merge_bvec.
*/
static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
int srcu_idx;
struct dm_table *map;
map = dm_get_live_table(md, &srcu_idx);
generic_start_io_acct(q, rw, bio_sectors(bio), &dm_disk(md)->part0);
/* if we're suspended, we have to queue this io for later */
if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) {
dm_put_live_table(md, srcu_idx);
if (!(bio->bi_opf & REQ_RAHEAD))
queue_io(md, bio);
else
bio_io_error(bio);
return BLK_QC_T_NONE;
}
__split_and_process_bio(md, map, bio);
dm_put_live_table(md, srcu_idx);
return BLK_QC_T_NONE;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 90 | 63.38% | 2 | 16.67% |
Alan Cox | 16 | 11.27% | 1 | 8.33% |
Mikulas Patocka | 10 | 7.04% | 2 | 16.67% |
Jeff Mahoney | 9 | 6.34% | 1 | 8.33% |
Mike Anderson | 6 | 4.23% | 1 | 8.33% |
Linus Torvalds | 4 | 2.82% | 1 | 8.33% |
Jens Axboe | 3 | 2.11% | 2 | 16.67% |
Milan Broz | 3 | 2.11% | 1 | 8.33% |
Tejun Heo | 1 | 0.70% | 1 | 8.33% |
Total | 142 | 100.00% | 12 | 100.00% |
static int dm_any_congested(void *congested_data, int bdi_bits)
{
int r = bdi_bits;
struct mapped_device *md = congested_data;
struct dm_table *map;
if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
if (dm_request_based(md)) {
/*
* With request-based DM we only need to check the
* top-level queue for congestion.
*/
r = md->queue->backing_dev_info->wb.state & bdi_bits;
} else {
map = dm_get_live_table_fast(md);
if (map)
r = dm_table_any_congested(map, bdi_bits);
dm_put_live_table_fast(md);
}
}
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 83 | 83.00% | 2 | 40.00% |
Mikulas Patocka | 10 | 10.00% | 1 | 20.00% |
Milan Broz | 6 | 6.00% | 1 | 20.00% |
Jan Kara | 1 | 1.00% | 1 | 20.00% |
Total | 100 | 100.00% | 5 | 100.00% |
/*-----------------------------------------------------------------
* An IDR is used to keep track of allocated minor numbers.
*---------------------------------------------------------------*/
static void free_minor(int minor)
{
spin_lock(&_minor_lock);
idr_remove(&_minor_idr, minor);
spin_unlock(&_minor_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alan Cox | 9 | 31.03% | 1 | 20.00% |
Mike Snitzer | 9 | 31.03% | 1 | 20.00% |
Tejun Heo | 5 | 17.24% | 1 | 20.00% |
Michael Christie | 4 | 13.79% | 1 | 20.00% |
Mikulas Patocka | 2 | 6.90% | 1 | 20.00% |
Total | 29 | 100.00% | 5 | 100.00% |
/*
* See if the device with a specific minor # is free.
*/
static int specific_minor(int minor)
{
int r;
if (minor >= (1 << MINORBITS))
return -EINVAL;
idr_preload(GFP_KERNEL);
spin_lock(&_minor_lock);
r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT);
spin_unlock(&_minor_lock);
idr_preload_end();
if (r < 0)
return r == -ENOSPC ? -EBUSY : r;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 47 | 55.95% | 1 | 14.29% |
Jeff Mahoney | 22 | 26.19% | 2 | 28.57% |
Mikulas Patocka | 8 | 9.52% | 2 | 28.57% |
Alasdair G. Kergon | 5 | 5.95% | 1 | 14.29% |
Alan Cox | 2 | 2.38% | 1 | 14.29% |
Total | 84 | 100.00% | 7 | 100.00% |
static int next_free_minor(int *minor)
{
int r;
idr_preload(GFP_KERNEL);
spin_lock(&_minor_lock);
r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT);
spin_unlock(&_minor_lock);
idr_preload_end();
if (r < 0)
return r;
*minor = r;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 48 | 70.59% | 2 | 22.22% |
Andrew Morton | 8 | 11.76% | 1 | 11.11% |
Mikulas Patocka | 3 | 4.41% | 1 | 11.11% |
Jeff Mahoney | 3 | 4.41% | 1 | 11.11% |
Alan Cox | 2 | 2.94% | 1 | 11.11% |
Alasdair G. Kergon | 2 | 2.94% | 1 | 11.11% |
Kiyoshi Ueda | 1 | 1.47% | 1 | 11.11% |
Benjamin Marzinski | 1 | 1.47% | 1 | 11.11% |
Total | 68 | 100.00% | 9 | 100.00% |
static const struct block_device_operations dm_blk_dops;
static const struct dax_operations dm_dax_ops;
static void dm_wq_work(struct work_struct *work);
void dm_init_md_queue(struct mapped_device *md)
{
/*
* Request-based dm devices cannot be stacked on top of bio-based dm
* devices. The type of this dm device may not have been decided yet.
* The type is decided at the first table loading time.
* To prevent problematic device stacking, clear the queue flag
* for request stacking support until then.
*
* This queue is new, so no concurrency on the queue_flags.
*/
queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue);
/*
* Initialize data that will only be used by a non-blk-mq DM queue
* - must do so here (in alloc_dev callchain) before queue is used
*/
md->queue->queuedata = md;
md->queue->backing_dev_info->congested_data = md;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 28 | 71.79% | 1 | 20.00% |
Mike Anderson | 5 | 12.82% | 1 | 20.00% |
Alasdair G. Kergon | 3 | 7.69% | 1 | 20.00% |
Andrew Morton | 2 | 5.13% | 1 | 20.00% |
Jan Kara | 1 | 2.56% | 1 | 20.00% |
Total | 39 | 100.00% | 5 | 100.00% |
void dm_init_normal_md_queue(struct mapped_device *md)
{
md->use_blk_mq = false;
dm_init_md_queue(md);
/*
* Initialize aspects of queue that aren't relevant for blk-mq
*/
md->queue->backing_dev_info->congested_fn = dm_any_congested;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 13 | 40.62% | 1 | 14.29% |
Jun'ichi Nomura | 7 | 21.88% | 1 | 14.29% |
Mike Anderson | 4 | 12.50% | 1 | 14.29% |
Alan Cox | 3 | 9.38% | 1 | 14.29% |
Benjamin Marzinski | 3 | 9.38% | 1 | 14.29% |
Jan Kara | 1 | 3.12% | 1 | 14.29% |
Jens Axboe | 1 | 3.12% | 1 | 14.29% |
Total | 32 | 100.00% | 7 | 100.00% |
static void cleanup_mapped_device(struct mapped_device *md)
{
if (md->wq)
destroy_workqueue(md->wq);
if (md->kworker_task)
kthread_stop(md->kworker_task);
mempool_destroy(md->io_pool);
if (md->bs)
bioset_free(md->bs);
if (md->dax_dev) {
kill_dax(md->dax_dev);
put_dax(md->dax_dev);
md->dax_dev = NULL;
}
if (md->disk) {
spin_lock(&_minor_lock);
md->disk->private_data = NULL;
spin_unlock(&_minor_lock);
del_gendisk(md->disk);
put_disk(md->disk);
}
if (md->queue)
blk_cleanup_queue(md->queue);
cleanup_srcu_struct(&md->io_barrier);
if (md->bdev) {
bdput(md->bdev);
md->bdev = NULL;
}
dm_mq_cleanup_mapped_device(md);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 79 | 45.40% | 8 | 44.44% |
Dan J Williams | 28 | 16.09% | 1 | 5.56% |
Kiyoshi Ueda | 21 | 12.07% | 1 | 5.56% |
Alan Cox | 17 | 9.77% | 1 | 5.56% |
Tahsin Erdogan | 8 | 4.60% | 1 | 5.56% |
Mikulas Patocka | 7 | 4.02% | 1 | 5.56% |
Jens Axboe | 7 | 4.02% | 1 | 5.56% |
Jeff Mahoney | 5 | 2.87% | 2 | 11.11% |
Stefan Bader | 1 | 0.57% | 1 | 5.56% |
Jun'ichi Nomura | 1 | 0.57% | 1 | 5.56% |
Total | 174 | 100.00% | 18 | 100.00% |
/*
* Allocate and initialise a blank device with a given minor.
*/
static struct mapped_device *alloc_dev(int minor)
{
int r, numa_node_id = dm_get_numa_node();
struct dax_device *dax_dev;
struct mapped_device *md;
void *old_md;
md = kzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id);
if (!md) {
DMWARN("unable to allocate device, out of memory.");
return NULL;
}
if (!try_module_get(THIS_MODULE))
goto bad_module_get;
/* get a minor number for the dev */
if (minor == DM_ANY_MINOR)
r = next_free_minor(&minor);
else
r = specific_minor(minor);
if (r < 0)
goto bad_minor;
r = init_srcu_struct(&md->io_barrier);
if (r < 0)
goto bad_io_barrier;
md->numa_node_id = numa_node_id;
md->use_blk_mq = dm_use_blk_mq_default();
md->init_tio_pdu = false;
md->type = DM_TYPE_NONE;
mutex_init(&md->suspend_lock);
mutex_init(&md->type_lock);
mutex_init(&md->table_devices_lock);
spin_lock_init(&md->deferred_lock);
atomic_set(&md->holders, 1);
atomic_set(&md->open_count, 0);
atomic_set(&md->event_nr, 0);
atomic_set(&md->uevent_seq, 0);
INIT_LIST_HEAD(&md->uevent_list);
INIT_LIST_HEAD(&md->table_devices);
spin_lock_init(&md->uevent_lock);
md->queue = blk_alloc_queue_node(GFP_KERNEL, numa_node_id);
if (!md->queue)
goto bad;
dm_init_md_queue(md);
md->disk = alloc_disk_node(1, numa_node_id);
if (!md->disk)
goto bad;
atomic_set(&md->pending[0], 0);
atomic_set(&md->pending[1], 0);
init_waitqueue_head(&md->wait);
INIT_WORK(&md->work, dm_wq_work);
init_waitqueue_head(&md->eventq);
init_completion(&md->kobj_holder.completion);
md->kworker_task = NULL;
md->disk->major = _major;
md->disk->first_minor = minor;
md->disk->fops = &dm_blk_dops;
md->disk->queue = md->queue;
md->disk->private_data = md;
sprintf(md->disk->disk_name, "dm-%d", minor);
dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops);
if (!dax_dev)
goto bad;
md->dax_dev = dax_dev;
add_disk(md->disk);
format_dev_t(md->name, MKDEV(_major, minor));
md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0);
if (!md->wq)
goto bad;
md->bdev = bdget_disk(md->disk, 0);
if (!md->bdev)
goto bad;
bio_init(&md->flush_bio, NULL, 0);
bio_set_dev(&md->flush_bio, md->bdev);
md->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC;
dm_stats_init(&md->stats);
/* Populate the mapping, nobody knows we exist yet */
spin_lock(&_minor_lock);
old_md = idr_replace(&_minor_idr, md, minor);
spin_unlock(&_minor_lock);
BUG_ON(old_md != MINOR_ALLOCED);
return md;
bad:
cleanup_mapped_device(md);
bad_io_barrier:
free_minor(minor);
bad_minor:
module_put(THIS_MODULE);
bad_module_get:
kfree(md);
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 362 | 58.01% | 11 | 25.58% |
Andrew Morton | 53 | 8.49% | 6 | 13.95% |
Dan J Williams | 35 | 5.61% | 1 | 2.33% |
Alan Cox | 28 | 4.49% | 1 | 2.33% |
Mike Anderson | 22 | 3.53% | 2 | 4.65% |
Kiyoshi Ueda | 21 | 3.37% | 1 | 2.33% |
Mikulas Patocka | 20 | 3.21% | 4 | 9.30% |
Alasdair G. Kergon | 19 | 3.04% | 4 | 9.30% |
Darrick J. Wong | 16 | 2.56% | 1 | 2.33% |
Christoph Hellwig | 10 | 1.60% | 2 | 4.65% |
Milan Broz | 9 | 1.44% | 2 | 4.65% |
Jeff Mahoney | 8 | 1.28% | 2 | 4.65% |
Tejun Heo | 7 | 1.12% | 2 | 4.65% |
Eric Dumazet | 5 | 0.80% | 1 | 2.33% |
Lei Ming | 4 | 0.64% | 1 | 2.33% |
Pranith Kumar | 3 | 0.48% | 1 | 2.33% |
Jan Kara | 2 | 0.32% | 1 | 2.33% |
Total | 624 | 100.00% | 43 | 100.00% |
static void unlock_fs(struct mapped_device *md);
static void free_dev(struct mapped_device *md)
{
int minor = MINOR(disk_devt(md->disk));
unlock_fs(md);
cleanup_mapped_device(md);
free_table_devices(&md->table_devices);
dm_stats_cleanup(&md->stats);
free_minor(minor);
module_put(THIS_MODULE);
kfree(md);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 55 | 84.62% | 4 | 40.00% |
Keith Busch | 3 | 4.62% | 1 | 10.00% |
Alasdair G. Kergon | 2 | 3.08% | 1 | 10.00% |
Kiyoshi Ueda | 2 | 3.08% | 1 | 10.00% |
Alan Cox | 1 | 1.54% | 1 | 10.00% |
Andrew Morton | 1 | 1.54% | 1 | 10.00% |
Eric Dumazet | 1 | 1.54% | 1 | 10.00% |
Total | 65 | 100.00% | 10 | 100.00% |
static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
{
struct dm_md_mempools *p = dm_table_get_md_mempools(t);
if (md->bs) {
/* The md already has necessary mempools. */
if (dm_table_bio_based(t)) {
/*
* Reload bioset because front_pad may have changed
* because a different table was loaded.
*/
bioset_free(md->bs);
md->bs = p->bs;
p->bs = NULL;
}
/*
* There's no need to reload with request-based dm
* because the size of front_pad doesn't change.
* Note for future: If you are to reload bioset,
* prep-ed requests in the queue may refer
* to bio from the old bioset, so you must walk
* through the queue to unprep.
*/
goto out;
}
BUG_ON(!p || md->io_pool || md->bs);
md->io_pool = p->io_pool;
p->io_pool = NULL;
md->bs = p->bs;
p->bs = NULL;
out:
/* mempool bind completed, no longer need any mempools in the table */
dm_table_free_md_mempools(t);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 100 | 83.33% | 4 | 33.33% |
Alan Cox | 8 | 6.67% | 1 | 8.33% |
Andrew Morton | 7 | 5.83% | 3 | 25.00% |
Pranith Kumar | 2 | 1.67% | 1 | 8.33% |
Milan Broz | 1 | 0.83% | 1 | 8.33% |
Mikulas Patocka | 1 | 0.83% | 1 | 8.33% |
Toshi Kani | 1 | 0.83% | 1 | 8.33% |
Total | 120 | 100.00% | 12 | 100.00% |
/*
* Bind a table to the device.
*/
static void event_callback(void *context)
{
unsigned long flags;
LIST_HEAD(uevents);
struct mapped_device *md = (struct mapped_device *) context;
spin_lock_irqsave(&md->uevent_lock, flags);
list_splice_init(&md->uevent_list, &uevents);
spin_unlock_irqrestore(&md->uevent_lock, flags);
dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj);
atomic_inc(&md->event_nr);
wake_up(&md->eventq);
dm_issue_global_event();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 93 | 95.88% | 8 | 72.73% |
Mikulas Patocka | 3 | 3.09% | 2 | 18.18% |
Alasdair G. Kergon | 1 | 1.03% | 1 | 9.09% |
Total | 97 | 100.00% | 11 | 100.00% |
/*
* Protected by md->suspend_lock obtained by dm_swap_table().
*/
static void __set_size(struct mapped_device *md, sector_t size)
{
lockdep_assert_held(&md->suspend_lock);
set_capacity(md->disk, size);
i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 34 | 72.34% | 4 | 66.67% |
Bart Van Assche | 8 | 17.02% | 1 | 16.67% |
Mikulas Patocka | 5 | 10.64% | 1 | 16.67% |
Total | 47 | 100.00% | 6 | 100.00% |
/*
* Returns old map, which caller must destroy.
*/
static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
struct queue_limits *limits)
{
struct dm_table *old_map;
struct request_queue *q = md->queue;
sector_t size;
lockdep_assert_held(&md->suspend_lock);
size = dm_table_get_size(t);
/*
* Wipe any geometry if the size of the table changed.
*/
if (size != dm_get_size(md))
memset(&md->geometry, 0, sizeof(md->geometry));
__set_size(md, size);
dm_table_event_callback(t, event_callback, md);
/*
* The queue hasn't been stopped yet, if the old table type wasn't
* for request-based during suspension. So stop it to prevent
* I/O mapping before resume.
* This must be done before setting the queue restrictions,
* because request-based dm may be run just after the setting.
*/
if (dm_table_request_based(t)) {
dm_stop_queue(q);
/*
* Leverage the fact that request-based DM targets are
* immutable singletons and establish md->immutable_target
* - used to optimize both dm_request_fn and dm_mq_queue_rq
*/
md->immutable_target = dm_table_get_immutable_target(t);
}
__bind_mempools(md, t);
old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
rcu_assign_pointer(md->map, (void *)t);
md->immutable_target_type = dm_table_get_immutable_target_type(t);
dm_table_set_restrictions(t, q, limits);
if (old_map)
dm_sync_table(md);
return old_map;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 180 | 94.74% | 9 | 81.82% |
Bart Van Assche | 8 | 4.21% | 1 | 9.09% |
Keith Busch | 2 | 1.05% | 1 | 9.09% |
Total | 190 | 100.00% | 11 | 100.00% |
/*
* Returns unbound table for the caller to free.
*/
static struct dm_table *__unbind(struct mapped_device *md)
{
struct dm_table *map = rcu_dereference_protected(md->map, 1);
if (!map)
return NULL;
dm_table_event_callback(map, NULL, NULL);
RCU_INIT_POINTER(md->map, NULL);
dm_sync_table(md);
return map;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 59 | 96.72% | 5 | 83.33% |
Mikulas Patocka | 2 | 3.28% | 1 | 16.67% |
Total | 61 | 100.00% | 6 | 100.00% |
/*
* Constructor for a new device.
*/
int dm_create(int minor, struct mapped_device **result)
{
struct mapped_device *md;
md = alloc_dev(minor);
if (!md)
return -ENXIO;
dm_sysfs_init(md);
*result = md;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 48 | 100.00% | 5 | 100.00% |
Total | 48 | 100.00% | 5 | 100.00% |
/*
* Functions to manage md->type.
* All are required to hold md->type_lock.
*/
void dm_lock_md_type(struct mapped_device *md)
{
mutex_lock(&md->type_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 18 | 100.00% | 4 | 100.00% |
Total | 18 | 100.00% | 4 | 100.00% |
void dm_unlock_md_type(struct mapped_device *md)
{
mutex_unlock(&md->type_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 18 | 100.00% | 3 | 100.00% |
Total | 18 | 100.00% | 3 | 100.00% |
void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type)
{
BUG_ON(!mutex_is_locked(&md->type_lock));
md->type = type;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 30 | 93.75% | 3 | 75.00% |
Bart Van Assche | 2 | 6.25% | 1 | 25.00% |
Total | 32 | 100.00% | 4 | 100.00% |
enum dm_queue_mode dm_get_md_type(struct mapped_device *md)
{
return md->type;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 14 | 87.50% | 2 | 66.67% |
Bart Van Assche | 2 | 12.50% | 1 | 33.33% |
Total | 16 | 100.00% | 3 | 100.00% |
struct target_type *dm_get_immutable_target_type(struct mapped_device *md)
{
return md->immutable_target_type;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 17 | 100.00% | 3 | 100.00% |
Total | 17 | 100.00% | 3 | 100.00% |
/*
* The queue_limits are only valid as long as you have a reference
* count on 'md'.
*/
struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
{
BUG_ON(!atomic_read(&md->holders));
return &md->queue->limits;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 32 | 100.00% | 4 | 100.00% |
Total | 32 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(dm_get_queue_limits);
/*
* Setup the DM device's queue based on md's type
*/
int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
{
int r;
enum dm_queue_mode type = dm_get_md_type(md);
switch (type) {
case DM_TYPE_REQUEST_BASED:
r = dm_old_init_request_queue(md, t);
if (r) {
DMERR("Cannot initialize queue for request-based mapped device");
return r;
}
break;
case DM_TYPE_MQ_REQUEST_BASED:
r = dm_mq_init_request_queue(md, t);
if (r) {
DMERR("Cannot initialize queue for request-based dm-mq mapped device");
return r;
}
break;
case DM_TYPE_BIO_BASED:
case DM_TYPE_DAX_BIO_BASED:
dm_init_normal_md_queue(md);
blk_queue_make_request(md->queue, dm_make_request);
/*
* DM handles splitting bios as needed. Free the bio_split bioset
* since it won't be used (saves 1 process per bio-based DM device).
*/
bioset_free(md->queue->bio_split);
md->queue->bio_split = NULL;
if (type == DM_TYPE_DAX_BIO_BASED)
queue_flag_set_unlocked(QUEUE_FLAG_DAX, md->queue);
break;
case DM_TYPE_NONE:
WARN_ON_ONCE(true);
break;
}
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 102 | 66.67% | 6 | 60.00% |
Toshi Kani | 20 | 13.07% | 1 | 10.00% |
Mikulas Patocka | 18 | 11.76% | 1 | 10.00% |
Bart Van Assche | 11 | 7.19% | 1 | 10.00% |
Christoph Hellwig | 2 | 1.31% | 1 | 10.00% |
Total | 153 | 100.00% | 10 | 100.00% |
struct mapped_device *dm_get_md(dev_t dev)
{
struct mapped_device *md;
unsigned minor = MINOR(dev);
if (MAJOR(dev) != _major || minor >= (1 << MINORBITS))
return NULL;
spin_lock(&_minor_lock);
md = idr_find(&_minor_idr, minor);
if (md) {
if ((md == MINOR_ALLOCED ||
(MINOR(disk_devt(dm_disk(md))) != minor) ||
dm_deleting_md(md) ||
test_bit(DMF_FREEING, &md->flags))) {
md = NULL;
goto out;
}
dm_get(md);
}
out:
spin_unlock(&_minor_lock);
return md;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alasdair G. Kergon | 73 | 57.03% | 1 | 11.11% |
Jeff Mahoney | 24 | 18.75% | 3 | 33.33% |
Mikulas Patocka | 11 | 8.59% | 1 | 11.11% |
David Teigland | 9 | 7.03% | 2 | 22.22% |
Tejun Heo | 6 | 4.69% | 1 | 11.11% |
Kiyoshi Ueda | 5 | 3.91% | 1 | 11.11% |
Total | 128 | 100.00% | 9 | 100.00% |
EXPORT_SYMBOL_GPL(dm_get_md);
void *dm_get_mdptr(struct mapped_device *md)
{
return md->interface_ptr;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
David Teigland | 11 | 68.75% | 1 | 33.33% |
Alasdair G. Kergon | 5 | 31.25% | 2 | 66.67% |
Total | 16 | 100.00% | 3 | 100.00% |
void dm_set_mdptr(struct mapped_device *md, void *ptr)
{
md->interface_ptr = ptr;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alasdair G. Kergon | 20 | 100.00% | 1 | 100.00% |
Total | 20 | 100.00% | 1 | 100.00% |
void dm_get(struct mapped_device *md)
{
atomic_inc(&md->holders);
BUG_ON(test_bit(DMF_FREEING, &md->flags));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alan Cox | 18 | 58.06% | 1 | 50.00% |
Kiyoshi Ueda | 13 | 41.94% | 1 | 50.00% |
Total | 31 | 100.00% | 2 | 100.00% |
int dm_hold(struct mapped_device *md)
{
spin_lock(&_minor_lock);
if (test_bit(DMF_FREEING, &md->flags)) {
spin_unlock(&_minor_lock);
return -EBUSY;
}
dm_get(md);
spin_unlock(&_minor_lock);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 54 | 100.00% | 1 | 100.00% |
Total | 54 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(dm_hold);
const char *dm_device_name(struct mapped_device *md)
{
return md->name;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alasdair G. Kergon | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(dm_device_name);
static void __dm_destroy(struct mapped_device *md, bool wait)
{
struct request_queue *q = dm_get_md_queue(md);
struct dm_table *map;
int srcu_idx;
might_sleep();
spin_lock(&_minor_lock);
idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md))));
set_bit(DMF_FREEING, &md->flags);
spin_unlock(&_minor_lock);
blk_set_queue_dying(q);
if (dm_request_based(md) && md->kworker_task)
kthread_flush_worker(&md->kworker);
/*
* Take suspend_lock so that presuspend and postsuspend methods
* do not race with internal suspend.
*/
mutex_lock(&md->suspend_lock);
map = dm_get_live_table(md, &srcu_idx);
if (!dm_suspended_md(md)) {
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
/* dm_put_live_table must be before msleep, otherwise deadlock is possible */
dm_put_live_table(md, srcu_idx);
mutex_unlock(&md->suspend_lock);
/*
* Rare, but there may be I/O requests still going to complete,
* for example. Wait for all references to disappear.
* No one should increment the reference count of the mapped_device,
* after the mapped_device state becomes DMF_FREEING.
*/
if (wait)
while (atomic_read(&md->holders))
msleep(1);
else if (atomic_read(&md->holders))
DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)",
dm_device_name(md), atomic_read(&md->holders));
dm_sysfs_exit(md);
dm_table_destroy(__unbind(md));
free_dev(md);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 57 | 25.68% | 2 | 8.70% |
Jeff Mahoney | 30 | 13.51% | 3 | 13.04% |
Mikulas Patocka | 22 | 9.91% | 3 | 13.04% |
Jun'ichi Nomura | 18 | 8.11% | 1 | 4.35% |
Bart Van Assche | 15 | 6.76% | 2 | 8.70% |
Keith Busch | 14 | 6.31% | 1 | 4.35% |
Alan Cox | 12 | 5.41% | 1 | 4.35% |
Alasdair G. Kergon | 11 | 4.95% | 2 | 8.70% |
Joe Thornber | 11 | 4.95% | 1 | 4.35% |
Mike Snitzer | 10 | 4.50% | 2 | 8.70% |
Andrew Morton | 8 | 3.60% | 1 | 4.35% |
Tejun Heo | 6 | 2.70% | 1 | 4.35% |
Milan Broz | 5 | 2.25% | 1 | 4.35% |
Mike Anderson | 2 | 0.90% | 1 | 4.35% |
Petr Mladek | 1 | 0.45% | 1 | 4.35% |
Total | 222 | 100.00% | 23 | 100.00% |
void dm_destroy(struct mapped_device *md)
{
__dm_destroy(md, true);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
void dm_destroy_immediate(struct mapped_device *md)
{
__dm_destroy(md, false);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
void dm_put(struct mapped_device *md)
{
atomic_dec(&md->holders);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 17 | 94.44% | 1 | 50.00% |
Mike Anderson | 1 | 5.56% | 1 | 50.00% |
Total | 18 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(dm_put);
static int dm_wait_for_completion(struct mapped_device *md, long task_state)
{
int r = 0;
DEFINE_WAIT(wait);
while (1) {
prepare_to_wait(&md->wait, &wait, task_state);
if (!md_in_flight(md))
break;
if (signal_pending_state(task_state, current)) {
r = -EINTR;
break;
}
io_schedule();
}
finish_wait(&md->wait, &wait);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Milan Broz | 41 | 47.67% | 1 | 11.11% |
Mikulas Patocka | 23 | 26.74% | 2 | 22.22% |
Bart Van Assche | 15 | 17.44% | 3 | 33.33% |
Kiyoshi Ueda | 5 | 5.81% | 2 | 22.22% |
Nikanth Karthikesan | 2 | 2.33% | 1 | 11.11% |
Total | 86 | 100.00% | 9 | 100.00% |
/*
* Process the deferred bios
*/
static void dm_wq_work(struct work_struct *work)
{
struct mapped_device *md = container_of(work, struct mapped_device,
work);
struct bio *c;
int srcu_idx;
struct dm_table *map;
map = dm_get_live_table(md, &srcu_idx);
while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
spin_lock_irq(&md->deferred_lock);
c = bio_list_pop(&md->deferred);
spin_unlock_irq(&md->deferred_lock);
if (!c)
break;
if (dm_request_based(md))
generic_make_request(c);
else
__split_and_process_bio(md, map, c);
}
dm_put_live_table(md, srcu_idx);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 89 | 71.20% | 7 | 46.67% |
Kiyoshi Ueda | 20 | 16.00% | 3 | 20.00% |
Milan Broz | 6 | 4.80% | 2 | 13.33% |
Alasdair G. Kergon | 5 | 4.00% | 1 | 6.67% |
Alan Cox | 4 | 3.20% | 1 | 6.67% |
Andrew Morton | 1 | 0.80% | 1 | 6.67% |
Total | 125 | 100.00% | 15 | 100.00% |
static void dm_queue_flush(struct mapped_device *md)
{
clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
smp_mb__after_atomic();
queue_work(md->wq, &md->work);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 35 | 97.22% | 2 | 66.67% |
Peter Zijlstra | 1 | 2.78% | 1 | 33.33% |
Total | 36 | 100.00% | 3 | 100.00% |
/*
* Swap in a new table, returning the old one for the caller to destroy.
*/
struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL);
struct queue_limits limits;
int r;
mutex_lock(&md->suspend_lock);
/* device must be suspended */
if (!dm_suspended_md(md))
goto out;
/*
* If the new table has no data devices, retain the existing limits.
* This helps multipath with queue_if_no_path if all paths disappear,
* then new I/O is queued based on these limits, and then some paths
* reappear.
*/
if (dm_table_has_no_data_devices(table)) {
live_map = dm_get_live_table_fast(md);
if (live_map)
limits = md->queue->limits;
dm_put_live_table_fast(md);
}
if (!live_map) {
r = dm_calculate_queue_limits(table, &limits);
if (r) {
map = ERR_PTR(r);
goto out;
}
}
map = __bind(md, table, &limits);
dm_issue_global_event();
out:
mutex_unlock(&md->suspend_lock);
return map;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 82 | 52.90% | 4 | 40.00% |
Mike Snitzer | 34 | 21.94% | 1 | 10.00% |
Alasdair G. Kergon | 24 | 15.48% | 2 | 20.00% |
Mike Christie | 9 | 5.81% | 1 | 10.00% |
Mikulas Patocka | 6 | 3.87% | 2 | 20.00% |
Total | 155 | 100.00% | 10 | 100.00% |
/*
* Functions to lock and unlock any filesystem running on the
* device.
*/
static int lock_fs(struct mapped_device *md)
{
int r;
WARN_ON(md->frozen_sb);
md->frozen_sb = freeze_bdev(md->bdev);
if (IS_ERR(md->frozen_sb)) {
r = PTR_ERR(md->frozen_sb);
md->frozen_sb = NULL;
return r;
}
set_bit(DMF_FROZEN, &md->flags);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alasdair G. Kergon | 48 | 64.86% | 6 | 75.00% |
Andrew Morton | 25 | 33.78% | 1 | 12.50% |
Mikulas Patocka | 1 | 1.35% | 1 | 12.50% |
Total | 74 | 100.00% | 8 | 100.00% |
static void unlock_fs(struct mapped_device *md)
{
if (!test_bit(DMF_FROZEN, &md->flags))
return;
thaw_bdev(md->bdev, md->frozen_sb);
md->frozen_sb = NULL;
clear_bit(DMF_FROZEN, &md->flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alasdair G. Kergon | 30 | 57.69% | 4 | 66.67% |
Andrew Morton | 21 | 40.38% | 1 | 16.67% |
Mikulas Patocka | 1 | 1.92% | 1 | 16.67% |
Total | 52 | 100.00% | 6 | 100.00% |
/*
* @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG
* @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE
* @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY
*
* If __dm_suspend returns 0, the device is completely quiescent
* now. There is no request-processing activity. All new requests
* are being added to md->deferred list.
*/
static int __dm_suspend(struct mapped_device *md, struct dm_table *map,
unsigned suspend_flags, long task_state,
int dmf_suspended_flag)
{
bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG;
bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG;
int r;
lockdep_assert_held(&md->suspend_lock);
/*
* DMF_NOFLUSH_SUSPENDING must be set before presuspend.
* This flag is cleared before dm_suspend returns.
*/
if (noflush)
set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
else
pr_debug("%s: suspending with flush\n", dm_device_name(md));
/*
* This gets reverted if there's an error later and the targets
* provide the .presuspend_undo hook.
*/
dm_table_presuspend_targets(map);
/*
* Flush I/O to the device.
* Any I/O submitted after lock_fs() may not be flushed.
* noflush takes precedence over do_lockfs.
* (lock_fs() flushes I/Os and waits for them to complete.)
*/
if (!noflush && do_lockfs) {
r = lock_fs(md);
if (r) {
dm_table_presuspend_undo_targets(map);
return r;
}
}
/*
* Here we must make sure that no processes are submitting requests
* to target drivers i.e. no one may be executing
* __split_and_process_bio. This is called from dm_request and
* dm_wq_work.
*
* To get all processes out of __split_and_process_bio in dm_request,
* we take the write lock. To prevent any process from reentering
* __split_and_process_bio from dm_request and quiesce the thread
* (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call
* flush_workqueue(md->wq).
*/
set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
if (map)
synchronize_srcu(&md->io_barrier);
/*
* Stop md->queue before flushing md->wq in case request-based
* dm defers requests to md->wq from md->queue.
*/
if (dm_request_based(md)) {
dm_stop_queue(md->queue);
if (md->kworker_task)
kthread_flush_worker(&md->kworker);
}
flush_workqueue(md->wq);
/*
* At this point no more requests are entering target request routines.
* We call dm_wait_for_completion to wait for all existing requests
* to finish.
*/
r = dm_wait_for_completion(md, task_state);
if (!r)
set_bit(dmf_suspended_flag, &md->flags);
if (noflush)
clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
if (map)
synchronize_srcu(&md->io_barrier);
/* were we interrupted ? */
if (r < 0) {
dm_queue_flush(md);
if (dm_request_based(md))
dm_start_queue(md->queue);
unlock_fs(md);
dm_table_presuspend_undo_targets(map);
/* pushback list is already flushed, so skip flush */
}
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 70 | 26.22% | 5 | 12.20% |
Mike Snitzer | 54 | 20.22% | 5 | 12.20% |
Alasdair G. Kergon | 35 | 13.11% | 7 | 17.07% |
Bart Van Assche | 22 | 8.24% | 3 | 7.32% |
Alan Cox | 17 | 6.37% | 1 | 2.44% |
Milan Broz | 14 | 5.24% | 4 | 9.76% |
Mikulas Patocka | 13 | 4.87% | 5 | 12.20% |
Jun'ichi Nomura | 10 | 3.75% | 2 | 4.88% |
Andrew Morton | 9 | 3.37% | 2 | 4.88% |
Keith Busch | 9 | 3.37% | 1 | 2.44% |
Hannes Reinecke | 8 | 3.00% | 1 | 2.44% |
Joe Thornber | 3 | 1.12% | 2 | 4.88% |
Tejun Heo | 2 | 0.75% | 2 | 4.88% |
Petr Mladek | 1 | 0.37% | 1 | 2.44% |
Total | 267 | 100.00% | 41 | 100.00% |
/*
* We need to be able to change a mapping table under a mounted
* filesystem. For example we might want to move some data in
* the background. Before the table can be swapped with
* dm_bind_table, dm_suspend must be called to flush any in
* flight bios and ensure that any further io gets deferred.
*/
/*
* Suspend mechanism in request-based dm.
*
* 1. Flush all I/Os by lock_fs() if needed.
* 2. Stop dispatching any I/O by stopping the request_queue.
* 3. Wait for all in-flight I/Os to be completed or requeued.
*
* To abort suspend, start the request_queue.
*/
int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
{
struct dm_table *map = NULL;
int r = 0;
retry:
mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING);
if (dm_suspended_md(md)) {
r = -EINVAL;
goto out_unlock;
}
if (dm_suspended_internally_md(md)) {
/* already internally suspended, wait for internal resume */
mutex_unlock(&md->suspend_lock);
r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE);
if (r)
return r;
goto retry;
}
map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED);
if (r)
goto out_unlock;
dm_table_postsuspend_targets(map);
out_unlock:
mutex_unlock(&md->suspend_lock);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 74 | 48.37% | 2 | 16.67% |
Alan Cox | 27 | 17.65% | 1 | 8.33% |
Alasdair G. Kergon | 24 | 15.69% | 2 | 16.67% |
Eric Dumazet | 9 | 5.88% | 1 | 8.33% |
Kiyoshi Ueda | 9 | 5.88% | 2 | 16.67% |
Andrew Morton | 5 | 3.27% | 1 | 8.33% |
Joe Thornber | 3 | 1.96% | 1 | 8.33% |
Milan Broz | 1 | 0.65% | 1 | 8.33% |
Daniel Walker | 1 | 0.65% | 1 | 8.33% |
Total | 153 | 100.00% | 12 | 100.00% |
static int __dm_resume(struct mapped_device *md, struct dm_table *map)
{
if (map) {
int r = dm_table_resume_targets(map);
if (r)
return r;
}
dm_queue_flush(md);
/*
* Flushing deferred I/Os must be done after targets are resumed
* so that mapping of targets can work correctly.
* Request-based dm is queueing the deferred I/Os in its request_queue.
*/
if (dm_request_based(md))
dm_start_queue(md->queue);
unlock_fs(md);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 60 | 92.31% | 2 | 66.67% |
Mikulas Patocka | 5 | 7.69% | 1 | 33.33% |
Total | 65 | 100.00% | 3 | 100.00% |
int dm_resume(struct mapped_device *md)
{
int r;
struct dm_table *map = NULL;
retry:
r = -EINVAL;
mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING);
if (!dm_suspended_md(md))
goto out;
if (dm_suspended_internally_md(md)) {
/* already internally suspended, wait for internal resume */
mutex_unlock(&md->suspend_lock);
r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE);
if (r)
return r;
goto retry;
}
map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
if (!map || !dm_table_get_size(map))
goto out;
r = __dm_resume(md, map);
if (r)
goto out;
clear_bit(DMF_SUSPENDED, &md->flags);
out:
mutex_unlock(&md->suspend_lock);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 146 | 91.25% | 1 | 33.33% |
Eric Dumazet | 9 | 5.62% | 1 | 33.33% |
Minfei Huang | 5 | 3.12% | 1 | 33.33% |
Total | 160 | 100.00% | 3 | 100.00% |
/*
* Internal suspend/resume works like userspace-driven suspend. It waits
* until all bios finish and prevents issuing new bios to the target drivers.
* It may be used only from the kernel.
*/
static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags)
{
struct dm_table *map = NULL;
lockdep_assert_held(&md->suspend_lock);
if (md->internal_suspend_count++)
return; /* nested internal suspend */
if (dm_suspended_md(md)) {
set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
return; /* nest suspend */
}
map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
/*
* Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is
* supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend
* would require changing .presuspend to return an error -- avoid this
* until there is a need for more elaborate variants of internal suspend.
*/
(void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE,
DMF_SUSPENDED_INTERNALLY);
dm_table_postsuspend_targets(map);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 78 | 79.59% | 2 | 40.00% |
Eric Dumazet | 9 | 9.18% | 1 | 20.00% |
Bart Van Assche | 8 | 8.16% | 1 | 20.00% |
Mikulas Patocka | 3 | 3.06% | 1 | 20.00% |
Total | 98 | 100.00% | 5 | 100.00% |
static void __dm_internal_resume(struct mapped_device *md)
{
BUG_ON(!md->internal_suspend_count);
if (--md->internal_suspend_count)
return; /* resume from nested internal suspend */
if (dm_suspended_md(md))
goto done; /* resume from nested suspend */
/*
* NOTE: existing callers don't need to call dm_table_resume_targets
* (which may fail -- so best to avoid it for now by passing NULL map)
*/
(void) __dm_resume(md, NULL);
done:
clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
smp_mb__after_atomic();
wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 64 | 85.33% | 1 | 50.00% |
Mikulas Patocka | 11 | 14.67% | 1 | 50.00% |
Total | 75 | 100.00% | 2 | 100.00% |
void dm_internal_suspend_noflush(struct mapped_device *md)
{
mutex_lock(&md->suspend_lock);
__dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG);
mutex_unlock(&md->suspend_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 33 | 100.00% | 1 | 100.00% |
Total | 33 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush);
void dm_internal_resume(struct mapped_device *md)
{
mutex_lock(&md->suspend_lock);
__dm_internal_resume(md);
mutex_unlock(&md->suspend_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 31 | 100.00% | 1 | 100.00% |
Total | 31 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(dm_internal_resume);
/*
* Fast variants of internal suspend/resume hold md->suspend_lock,
* which prevents interaction with userspace-driven suspend.
*/
void dm_internal_suspend_fast(struct mapped_device *md)
{
mutex_lock(&md->suspend_lock);
if (dm_suspended_md(md) || dm_suspended_internally_md(md))
return;
set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
synchronize_srcu(&md->io_barrier);
flush_workqueue(md->wq);
dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 49 | 77.78% | 1 | 50.00% |
Mike Snitzer | 14 | 22.22% | 1 | 50.00% |
Total | 63 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(dm_internal_suspend_fast);
void dm_internal_resume_fast(struct mapped_device *md)
{
if (dm_suspended_md(md) || dm_suspended_internally_md(md))
goto done;
dm_queue_flush(md);
done:
mutex_unlock(&md->suspend_lock);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 34 | 85.00% | 1 | 50.00% |
Mike Snitzer | 6 | 15.00% | 1 | 50.00% |
Total | 40 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(dm_internal_resume_fast);
/*-----------------------------------------------------------------
* Event notification.
*---------------------------------------------------------------*/
int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
unsigned cookie)
{
char udev_cookie[DM_COOKIE_LENGTH];
char *envp[] = { udev_cookie, NULL };
if (!cookie)
return kobject_uevent(&disk_to_dev(md->disk)->kobj, action);
else {
snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u",
DM_COOKIE_ENV_VAR_NAME, cookie);
return kobject_uevent_env(&disk_to_dev(md->disk)->kobj,
action, envp);
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Milan Broz | 61 | 68.54% | 1 | 25.00% |
Alasdair G. Kergon | 20 | 22.47% | 1 | 25.00% |
Peter Rajnoha | 5 | 5.62% | 1 | 25.00% |
Tejun Heo | 3 | 3.37% | 1 | 25.00% |
Total | 89 | 100.00% | 4 | 100.00% |
uint32_t dm_next_uevent_seq(struct mapped_device *md)
{
return atomic_add_return(1, &md->uevent_seq);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Anderson | 21 | 100.00% | 1 | 100.00% |
Total | 21 | 100.00% | 1 | 100.00% |
uint32_t dm_get_event_nr(struct mapped_device *md)
{
return atomic_read(&md->event_nr);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Andrew Morton | 19 | 100.00% | 2 | 100.00% |
Total | 19 | 100.00% | 2 | 100.00% |
int dm_wait_event(struct mapped_device *md, int event_nr)
{
return wait_event_interruptible(md->eventq,
(event_nr != atomic_read(&md->event_nr)));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Andrew Morton | 33 | 100.00% | 2 | 100.00% |
Total | 33 | 100.00% | 2 | 100.00% |
void dm_uevent_add(struct mapped_device *md, struct list_head *elist)
{
unsigned long flags;
spin_lock_irqsave(&md->uevent_lock, flags);
list_add(elist, &md->uevent_list);
spin_unlock_irqrestore(&md->uevent_lock, flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Anderson | 49 | 100.00% | 1 | 100.00% |
Total | 49 | 100.00% | 1 | 100.00% |
/*
* The gendisk is only valid as long as you have a reference
* count on 'md'.
*/
struct gendisk *dm_disk(struct mapped_device *md)
{
return md->disk;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alan Cox | 11 | 64.71% | 1 | 50.00% |
Al Viro | 6 | 35.29% | 1 | 50.00% |
Total | 17 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(dm_disk);
struct kobject *dm_kobject(struct mapped_device *md)
{
return &md->kobj_holder.kobj;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Milan Broz | 18 | 90.00% | 1 | 50.00% |
Mikulas Patocka | 2 | 10.00% | 1 | 50.00% |
Total | 20 | 100.00% | 2 | 100.00% |
struct mapped_device *dm_get_from_kobject(struct kobject *kobj)
{
struct mapped_device *md;
md = container_of(kobj, struct mapped_device, kobj_holder.kobj);
if (test_bit(DMF_FREEING, &md->flags) ||
dm_deleting_md(md))
return NULL;
dm_get(md);
return md;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Milan Broz | 56 | 94.92% | 2 | 50.00% |
Mikulas Patocka | 2 | 3.39% | 1 | 25.00% |
Mike Anderson | 1 | 1.69% | 1 | 25.00% |
Total | 59 | 100.00% | 4 | 100.00% |
int dm_suspended_md(struct mapped_device *md)
{
return test_bit(DMF_SUSPENDED, &md->flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alan Cox | 17 | 80.95% | 1 | 33.33% |
Mike Snitzer | 3 | 14.29% | 1 | 33.33% |
Kiyoshi Ueda | 1 | 4.76% | 1 | 33.33% |
Total | 21 | 100.00% | 3 | 100.00% |
int dm_suspended_internally_md(struct mapped_device *md)
{
return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 18 | 85.71% | 1 | 50.00% |
Alan Cox | 3 | 14.29% | 1 | 50.00% |
Total | 21 | 100.00% | 2 | 100.00% |
int dm_test_deferred_remove_flag(struct mapped_device *md)
{
return test_bit(DMF_DEFERRED_REMOVE, &md->flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mikulas Patocka | 21 | 100.00% | 1 | 100.00% |
Total | 21 | 100.00% | 1 | 100.00% |
int dm_suspended(struct dm_target *ti)
{
return dm_suspended_md(dm_table_get_md(ti->table));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 21 | 100.00% | 2 | 100.00% |
Total | 21 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(dm_suspended);
int dm_noflush_suspending(struct dm_target *ti)
{
return __noflush_suspending(dm_table_get_md(ti->table));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 21 | 100.00% | 2 | 100.00% |
Total | 21 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(dm_noflush_suspending);
struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
unsigned integrity, unsigned per_io_data_size)
{
struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id);
unsigned int pool_size = 0;
unsigned int front_pad;
if (!pools)
return NULL;
switch (type) {
case DM_TYPE_BIO_BASED:
case DM_TYPE_DAX_BIO_BASED:
pool_size = dm_get_reserved_bio_based_ios();
front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
pools->io_pool = mempool_create_slab_pool(pool_size, _io_cache);
if (!pools->io_pool)
goto out;
break;
case DM_TYPE_REQUEST_BASED:
case DM_TYPE_MQ_REQUEST_BASED:
pool_size = dm_get_reserved_rq_based_ios();
front_pad = offsetof(struct dm_rq_clone_bio_info, clone);
/* per_io_data_size is used for blk-mq pdu at queue allocation */
break;
default:
BUG();
}
pools->bs = bioset_create(pool_size, front_pad, BIOSET_NEED_RESCUER);
if (!pools->bs)
goto out;
if (integrity && bioset_integrity_create(pools->bs, pool_size))
goto out;
return pools;
out:
dm_free_md_mempools(pools);
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 93 | 46.73% | 7 | 36.84% |
Kiyoshi Ueda | 47 | 23.62% | 1 | 5.26% |
Jun'ichi Nomura | 19 | 9.55% | 2 | 10.53% |
Mikulas Patocka | 13 | 6.53% | 1 | 5.26% |
Christoph Hellwig | 10 | 5.03% | 2 | 10.53% |
Martin K. Petersen | 5 | 2.51% | 1 | 5.26% |
Kent Overstreet | 4 | 2.01% | 1 | 5.26% |
Neil Brown | 3 | 1.51% | 2 | 10.53% |
Toshi Kani | 3 | 1.51% | 1 | 5.26% |
Bart Van Assche | 2 | 1.01% | 1 | 5.26% |
Total | 199 | 100.00% | 19 | 100.00% |
void dm_free_md_mempools(struct dm_md_mempools *pools)
{
if (!pools)
return;
mempool_destroy(pools->io_pool);
if (pools->bs)
bioset_free(pools->bs);
kfree(pools);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Kiyoshi Ueda | 36 | 87.80% | 1 | 50.00% |
Mike Snitzer | 5 | 12.20% | 1 | 50.00% |
Total | 41 | 100.00% | 2 | 100.00% |
struct dm_pr {
u64 old_key;
u64 new_key;
u32 flags;
bool fail_early;
};
static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn,
void *data)
{
struct mapped_device *md = bdev->bd_disk->private_data;
struct dm_table *table;
struct dm_target *ti;
int ret = -ENOTTY, srcu_idx;
table = dm_get_live_table(md, &srcu_idx);
if (!table || !dm_table_get_size(table))
goto out;
/* We only support devices that have a single target */
if (dm_table_get_num_targets(table) != 1)
goto out;
ti = dm_table_get_target(table, 0);
ret = -EINVAL;
if (!ti->type->iterate_devices)
goto out;
ret = ti->type->iterate_devices(ti, fn, data);
out:
dm_put_live_table(md, srcu_idx);
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 132 | 96.35% | 2 | 50.00% |
Alan Cox | 4 | 2.92% | 1 | 25.00% |
Andrew Morton | 1 | 0.73% | 1 | 25.00% |
Total | 137 | 100.00% | 4 | 100.00% |
/*
* For register / unregister we need to manually call out to every path.
*/
static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
struct dm_pr *pr = data;
const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops;
if (!ops || !ops->pr_register)
return -EOPNOTSUPP;
return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 77 | 90.59% | 2 | 50.00% |
Kiyoshi Ueda | 5 | 5.88% | 1 | 25.00% |
Mike Snitzer | 3 | 3.53% | 1 | 25.00% |
Total | 85 | 100.00% | 4 | 100.00% |
static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
u32 flags)
{
struct dm_pr pr = {
.old_key = old_key,
.new_key = new_key,
.flags = flags,
.fail_early = true,
};
int ret;
ret = dm_call_pr(bdev, __dm_pr_register, &pr);
if (ret && new_key) {
/* unregister all paths if we failed to register any path */
pr.old_key = new_key;
pr.new_key = 0;
pr.flags = 0;
pr.fail_early = false;
dm_call_pr(bdev, __dm_pr_register, &pr);
}
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 99 | 92.52% | 2 | 33.33% |
Alan Cox | 4 | 3.74% | 1 | 16.67% |
Darrick J. Wong | 2 | 1.87% | 1 | 16.67% |
Mike Snitzer | 1 | 0.93% | 1 | 16.67% |
Andrew Morton | 1 | 0.93% | 1 | 16.67% |
Total | 107 | 100.00% | 6 | 100.00% |
static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
u32 flags)
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
fmode_t mode;
int r;
r = dm_grab_bdev_for_ioctl(md, &bdev, &mode);
if (r < 0)
return r;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_reserve)
r = ops->pr_reserve(bdev, key, type, flags);
else
r = -EOPNOTSUPP;
bdput(bdev);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 105 | 92.92% | 1 | 20.00% |
Alan Cox | 3 | 2.65% | 1 | 20.00% |
Mike Snitzer | 3 | 2.65% | 1 | 20.00% |
Milan Broz | 1 | 0.88% | 1 | 20.00% |
Darrick J. Wong | 1 | 0.88% | 1 | 20.00% |
Total | 113 | 100.00% | 5 | 100.00% |
static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
fmode_t mode;
int r;
r = dm_grab_bdev_for_ioctl(md, &bdev, &mode);
if (r < 0)
return r;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_release)
r = ops->pr_release(bdev, key, type);
else
r = -EOPNOTSUPP;
bdput(bdev);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 105 | 97.22% | 1 | 50.00% |
Mike Snitzer | 3 | 2.78% | 1 | 50.00% |
Total | 108 | 100.00% | 2 | 100.00% |
static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
enum pr_type type, bool abort)
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
fmode_t mode;
int r;
r = dm_grab_bdev_for_ioctl(md, &bdev, &mode);
if (r < 0)
return r;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_preempt)
r = ops->pr_preempt(bdev, old_key, new_key, type, abort);
else
r = -EOPNOTSUPP;
bdput(bdev);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 115 | 97.46% | 1 | 50.00% |
Mike Snitzer | 3 | 2.54% | 1 | 50.00% |
Total | 118 | 100.00% | 2 | 100.00% |
static int dm_pr_clear(struct block_device *bdev, u64 key)
{
struct mapped_device *md = bdev->bd_disk->private_data;
const struct pr_ops *ops;
fmode_t mode;
int r;
r = dm_grab_bdev_for_ioctl(md, &bdev, &mode);
if (r < 0)
return r;
ops = bdev->bd_disk->fops->pr_ops;
if (ops && ops->pr_clear)
r = ops->pr_clear(bdev, key);
else
r = -EOPNOTSUPP;
bdput(bdev);
return r;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 99 | 97.06% | 1 | 50.00% |
Mike Snitzer | 3 | 2.94% | 1 | 50.00% |
Total | 102 | 100.00% | 2 | 100.00% |
static const struct pr_ops dm_pr_ops = {
.pr_register = dm_pr_register,
.pr_reserve = dm_pr_reserve,
.pr_release = dm_pr_release,
.pr_preempt = dm_pr_preempt,
.pr_clear = dm_pr_clear,
};
static const struct block_device_operations dm_blk_dops = {
.open = dm_blk_open,
.release = dm_blk_close,
.ioctl = dm_blk_ioctl,
.getgeo = dm_blk_getgeo,
.pr_ops = &dm_pr_ops,
.owner = THIS_MODULE
};
static const struct dax_operations dm_dax_ops = {
.direct_access = dm_dax_direct_access,
.copy_from_iter = dm_dax_copy_from_iter,
};
/*
* module hooks
*/
module_init(dm_init);
module_exit(dm_exit);
module_param(major, uint, 0);
MODULE_PARM_DESC(major, "The major number of the device mapper");
module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools");
module_param(dm_numa_node, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations");
MODULE_DESCRIPTION(DM_NAME " driver");
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
MODULE_LICENSE("GPL");
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Mike Snitzer | 6021 | 48.53% | 51 | 18.21% |
Christoph Hellwig | 1090 | 8.79% | 12 | 4.29% |
Kiyoshi Ueda | 1068 | 8.61% | 20 | 7.14% |
Mikulas Patocka | 1006 | 8.11% | 41 | 14.64% |
Alasdair G. Kergon | 462 | 3.72% | 29 | 10.36% |
Alan Cox | 450 | 3.63% | 2 | 0.71% |
Damien Le Moal | 388 | 3.13% | 3 | 1.07% |
Dan J Williams | 372 | 3.00% | 3 | 1.07% |
Milan Broz | 254 | 2.05% | 12 | 4.29% |
Andrew Morton | 242 | 1.95% | 13 | 4.64% |
Mike Anderson | 129 | 1.04% | 5 | 1.79% |
Jeff Mahoney | 125 | 1.01% | 6 | 2.14% |
Bart Van Assche | 97 | 0.78% | 10 | 3.57% |
Keith Busch | 95 | 0.77% | 2 | 0.71% |
Toshi Kani | 88 | 0.71% | 1 | 0.36% |
Jun'ichi Nomura | 74 | 0.60% | 11 | 3.93% |
Tejun Heo | 58 | 0.47% | 7 | 2.50% |
Joe Thornber | 56 | 0.45% | 6 | 2.14% |
Jens Axboe | 39 | 0.31% | 6 | 2.14% |
Neil Brown | 37 | 0.30% | 3 | 1.07% |
Eric Dumazet | 33 | 0.27% | 1 | 0.36% |
Kent Overstreet | 28 | 0.23% | 3 | 1.07% |
Kevin Corry | 24 | 0.19% | 2 | 0.71% |
Darrick J. Wong | 24 | 0.19% | 1 | 0.36% |
David Teigland | 20 | 0.16% | 2 | 0.71% |
Martin K. Petersen | 15 | 0.12% | 2 | 0.71% |
Benjamin Marzinski | 10 | 0.08% | 1 | 0.36% |
Mike Christie | 9 | 0.07% | 1 | 0.36% |
Tahsin Erdogan | 8 | 0.06% | 1 | 0.36% |
Hannes Reinecke | 8 | 0.06% | 1 | 0.36% |
Michael Christie | 7 | 0.06% | 1 | 0.36% |
Al Viro | 6 | 0.05% | 1 | 0.36% |
Stefan Bader | 5 | 0.04% | 1 | 0.36% |
Peter Rajnoha | 5 | 0.04% | 1 | 0.36% |
Edward Goggin | 5 | 0.04% | 1 | 0.36% |
Pranith Kumar | 5 | 0.04% | 1 | 0.36% |
Minfei Huang | 5 | 0.04% | 1 | 0.36% |
Nikanth Karthikesan | 5 | 0.04% | 1 | 0.36% |
Jan Kara | 5 | 0.04% | 2 | 0.71% |
Sami Tolvanen | 5 | 0.04% | 1 | 0.36% |
Lei Ming | 4 | 0.03% | 1 | 0.36% |
Linus Torvalds | 4 | 0.03% | 1 | 0.36% |
Ingo Molnar | 3 | 0.02% | 1 | 0.36% |
Richard Kennedy | 3 | 0.02% | 1 | 0.36% |
Petr Mladek | 2 | 0.02% | 1 | 0.36% |
Arjan van de Ven | 2 | 0.02% | 1 | 0.36% |
Bryn M. Reeves | 2 | 0.02% | 1 | 0.36% |
Chandra Seetharaman | 1 | 0.01% | 1 | 0.36% |
Daniel Walker | 1 | 0.01% | 1 | 0.36% |
Peter Osterlund | 1 | 0.01% | 1 | 0.36% |
Peter Zijlstra | 1 | 0.01% | 1 | 0.36% |
Total | 12407 | 100.00% | 280 | 100.00% |
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