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Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm 

* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (24 commits)
  dm crypt: add documentation
  dm: remove md argument from specific_minor
  dm table: remove unused dm_create_error_table
  dm table: drop void suspend_targets return
  dm: unplug queues in threads
  dm raid1: use timer
  dm: move include files
  dm kcopyd: rename
  dm: expose macros
  dm kcopyd: remove redundant client counting
  dm kcopyd: private mempool
  dm kcopyd: per device
  dm log: make module use tracking internal
  dm log: move register functions
  dm log: clean interface
  dm kcopyd: clean interface
  dm io: clean interface
  dm io: rename error to error_bits
  dm snapshot: store pointer to target instance
  dm log: move dirty region log code into separate module
  ...
This commit is contained in:
Linus Torvalds 2008-04-25 12:33:49 -07:00
parent 4b7227ca32 e3dcc5a387
commit 6f97b220f4
17 changed files with 667 additions and 608 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
Documentation/device-mapper/dm-crypt.txt Normal file
View File

@ -0,0 +1,52 @@
dm-crypt
=========
Device-Mapper's "crypt" target provides transparent encryption of block devices
using the kernel crypto API.
Parameters: <cipher> <key> <iv_offset> <device path> <offset>
<cipher>
Encryption cipher and an optional IV generation mode.
(In format cipher-chainmode-ivopts:ivmode).
Examples:
des
aes-cbc-essiv:sha256
twofish-ecb
/proc/crypto contains supported crypto modes
<key>
Key used for encryption. It is encoded as a hexadecimal number.
You can only use key sizes that are valid for the selected cipher.
<iv_offset>
The IV offset is a sector count that is added to the sector number
before creating the IV.
<device path>
This is the device that is going to be used as backend and contains the
encrypted data. You can specify it as a path like /dev/xxx or a device
number <major>:<minor>.
<offset>
Starting sector within the device where the encrypted data begins.
Example scripts
===============
LUKS (Linux Unified Key Setup) is now the preferred way to set up disk
encryption with dm-crypt using the 'cryptsetup' utility, see
http://luks.endorphin.org/
[[
#!/bin/sh
# Create a crypt device using dmsetup
dmsetup create crypt1 --table "0 `blockdev --getsize $1` crypt aes-cbc-essiv:sha256 babebabebabebabebabebabebabebabe 0 $1 0"
]]
[[
#!/bin/sh
# Create a crypt device using cryptsetup and LUKS header with default cipher
cryptsetup luksFormat $1
cryptsetup luksOpen $1 crypt1
]]

6
drivers/md/Makefile
View File

@ -3,10 +3,10 @@
#
dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \
dm-ioctl.o dm-io.o kcopyd.o
dm-ioctl.o dm-io.o dm-kcopyd.o
dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o
dm-snapshot-objs := dm-snap.o dm-exception-store.o
dm-mirror-objs := dm-log.o dm-raid1.o
dm-mirror-objs := dm-raid1.o
dm-rdac-objs := dm-mpath-rdac.o
dm-hp-sw-objs := dm-mpath-hp-sw.o
md-mod-objs := md.o bitmap.o
@ -39,7 +39,7 @@ obj-$(CONFIG_DM_MULTIPATH_EMC) += dm-emc.o
obj-$(CONFIG_DM_MULTIPATH_HP) += dm-hp-sw.o
obj-$(CONFIG_DM_MULTIPATH_RDAC) += dm-rdac.o
obj-$(CONFIG_DM_SNAPSHOT) += dm-snapshot.o
obj-$(CONFIG_DM_MIRROR) += dm-mirror.o
obj-$(CONFIG_DM_MIRROR) += dm-mirror.o dm-log.o
obj-$(CONFIG_DM_ZERO) += dm-zero.o
quiet_cmd_unroll = UNROLL $@

10
drivers/md/dm-exception-store.c
View File

@ -9,13 +9,13 @@
#include "dm.h"
#include "dm-snap.h"
#include "dm-io.h"
#include "kcopyd.h"
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/dm-io.h>
#include <linux/dm-kcopyd.h>
#define DM_MSG_PREFIX "snapshots"
#define DM_CHUNK_SIZE_DEFAULT_SECTORS 32 /* 16KB */
@ -131,7 +131,7 @@ struct pstore {
static unsigned sectors_to_pages(unsigned sectors)
{
return sectors / (PAGE_SIZE >> 9);
return DIV_ROUND_UP(sectors, PAGE_SIZE >> 9);
}
static int alloc_area(struct pstore *ps)
@ -159,7 +159,7 @@ static void free_area(struct pstore *ps)
}
struct mdata_req {
struct io_region *where;
struct dm_io_region *where;
struct dm_io_request *io_req;
struct work_struct work;
int result;
@ -177,7 +177,7 @@ static void do_metadata(struct work_struct *work)
*/
static int chunk_io(struct pstore *ps, uint32_t chunk, int rw, int metadata)
{
struct io_region where = {
struct dm_io_region where = {
.bdev = ps->snap->cow->bdev,
.sector = ps->snap->chunk_size * chunk,
.count = ps->snap->chunk_size,

38
drivers/md/dm-io.c
View File

@ -5,13 +5,14 @@
* This file is released under the GPL.
*/
#include "dm-io.h"
#include "dm.h"
#include <linux/bio.h>
#include <linux/mempool.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/dm-io.h>
struct dm_io_client {
mempool_t *pool;
@ -20,7 +21,7 @@ struct dm_io_client {
/* FIXME: can we shrink this ? */
struct io {
unsigned long error;
unsigned long error_bits;
atomic_t count;
struct task_struct *sleeper;
struct dm_io_client *client;
@ -107,14 +108,14 @@ static inline unsigned bio_get_region(struct bio *bio)
static void dec_count(struct io *io, unsigned int region, int error)
{
if (error)
set_bit(region, &io->error);
set_bit(region, &io->error_bits);
if (atomic_dec_and_test(&io->count)) {
if (io->sleeper)
wake_up_process(io->sleeper);
else {
unsigned long r = io->error;
unsigned long r = io->error_bits;
io_notify_fn fn = io->callback;
void *context = io->context;
@ -271,7 +272,7 @@ static void km_dp_init(struct dpages *dp, void *data)
/*-----------------------------------------------------------------
* IO routines that accept a list of pages.
*---------------------------------------------------------------*/
static void do_region(int rw, unsigned int region, struct io_region *where,
static void do_region(int rw, unsigned region, struct dm_io_region *where,
struct dpages *dp, struct io *io)
{
struct bio *bio;
@ -320,7 +321,7 @@ static void do_region(int rw, unsigned int region, struct io_region *where,
}
static void dispatch_io(int rw, unsigned int num_regions,
struct io_region *where, struct dpages *dp,
struct dm_io_region *where, struct dpages *dp,
struct io *io, int sync)
{
int i;
@ -347,17 +348,17 @@ static void dispatch_io(int rw, unsigned int num_regions,
}
static int sync_io(struct dm_io_client *client, unsigned int num_regions,
struct io_region *where, int rw, struct dpages *dp,
struct dm_io_region *where, int rw, struct dpages *dp,
unsigned long *error_bits)
{
struct io io;
if (num_regions > 1 && rw != WRITE) {
if (num_regions > 1 && (rw & RW_MASK) != WRITE) {
WARN_ON(1);
return -EIO;
}
io.error = 0;
io.error_bits = 0;
atomic_set(&io.count, 1); /* see dispatch_io() */
io.sleeper = current;
io.client = client;
@ -378,25 +379,25 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
return -EINTR;
if (error_bits)
*error_bits = io.error;
*error_bits = io.error_bits;
return io.error ? -EIO : 0;
return io.error_bits ? -EIO : 0;
}
static int async_io(struct dm_io_client *client, unsigned int num_regions,
struct io_region *where, int rw, struct dpages *dp,
struct dm_io_region *where, int rw, struct dpages *dp,
io_notify_fn fn, void *context)
{
struct io *io;
if (num_regions > 1 && rw != WRITE) {
if (num_regions > 1 && (rw & RW_MASK) != WRITE) {
WARN_ON(1);
fn(1, context);
return -EIO;
}
io = mempool_alloc(client->pool, GFP_NOIO);
io->error = 0;
io->error_bits = 0;
atomic_set(&io->count, 1); /* see dispatch_io() */
io->sleeper = NULL;
io->client = client;
@ -435,10 +436,15 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
}
/*
* New collapsed (a)synchronous interface
* New collapsed (a)synchronous interface.
*
* If the IO is asynchronous (i.e. it has notify.fn), you must either unplug
* the queue with blk_unplug() some time later or set the BIO_RW_SYNC bit in
* io_req->bi_rw. If you fail to do one of these, the IO will be submitted to
* the disk after q->unplug_delay, which defaults to 3ms in blk-settings.c.
*/
int dm_io(struct dm_io_request *io_req, unsigned num_regions,
struct io_region *where, unsigned long *sync_error_bits)
struct dm_io_region *where, unsigned long *sync_error_bits)
{
int r;
struct dpages dp;

302
drivers/md/kcopyd.c → drivers/md/dm-kcopyd.c
View File

@ -9,9 +9,8 @@
* completion notification.
*/
#include <asm/types.h>
#include <linux/types.h>
#include <asm/atomic.h>
#include <linux/blkdev.h>
#include <linux/fs.h>
#include <linux/init.h>
@ -23,24 +22,15 @@
#include <linux/vmalloc.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/dm-kcopyd.h>
#include "kcopyd.h"
static struct workqueue_struct *_kcopyd_wq;
static struct work_struct _kcopyd_work;
static void wake(void)
{
queue_work(_kcopyd_wq, &_kcopyd_work);
}
#include "dm.h"
/*-----------------------------------------------------------------
* Each kcopyd client has its own little pool of preallocated
* pages for kcopyd io.
*---------------------------------------------------------------*/
struct kcopyd_client {
struct list_head list;
struct dm_kcopyd_client {
spinlock_t lock;
struct page_list *pages;
unsigned int nr_pages;
@ -50,8 +40,32 @@ struct kcopyd_client {
wait_queue_head_t destroyq;
atomic_t nr_jobs;
mempool_t *job_pool;
struct workqueue_struct *kcopyd_wq;
struct work_struct kcopyd_work;
/*
* We maintain three lists of jobs:
*
* i) jobs waiting for pages
* ii) jobs that have pages, and are waiting for the io to be issued.
* iii) jobs that have completed.
*
* All three of these are protected by job_lock.
*/
spinlock_t job_lock;
struct list_head complete_jobs;
struct list_head io_jobs;
struct list_head pages_jobs;
};
static void wake(struct dm_kcopyd_client *kc)
{
queue_work(kc->kcopyd_wq, &kc->kcopyd_work);
}
static struct page_list *alloc_pl(void)
{
struct page_list *pl;
@ -75,7 +89,7 @@ static void free_pl(struct page_list *pl)
kfree(pl);
}
static int kcopyd_get_pages(struct kcopyd_client *kc,
static int kcopyd_get_pages(struct dm_kcopyd_client *kc,
unsigned int nr, struct page_list **pages)
{
struct page_list *pl;
@ -98,7 +112,7 @@ static int kcopyd_get_pages(struct kcopyd_client *kc,
return 0;
}
static void kcopyd_put_pages(struct kcopyd_client *kc, struct page_list *pl)
static void kcopyd_put_pages(struct dm_kcopyd_client *kc, struct page_list *pl)
{
struct page_list *cursor;
@ -126,7 +140,7 @@ static void drop_pages(struct page_list *pl)
}
}
static int client_alloc_pages(struct kcopyd_client *kc, unsigned int nr)
static int client_alloc_pages(struct dm_kcopyd_client *kc, unsigned int nr)
{
unsigned int i;
struct page_list *pl = NULL, *next;
@ -147,7 +161,7 @@ static int client_alloc_pages(struct kcopyd_client *kc, unsigned int nr)
return 0;
}
static void client_free_pages(struct kcopyd_client *kc)
static void client_free_pages(struct dm_kcopyd_client *kc)
{
BUG_ON(kc->nr_free_pages != kc->nr_pages);
drop_pages(kc->pages);
@ -161,7 +175,7 @@ static void client_free_pages(struct kcopyd_client *kc)
* ever having to do io (which could cause a deadlock).
*---------------------------------------------------------------*/
struct kcopyd_job {
struct kcopyd_client *kc;
struct dm_kcopyd_client *kc;
struct list_head list;
unsigned long flags;
@ -175,13 +189,13 @@ struct kcopyd_job {
* Either READ or WRITE
*/
int rw;
struct io_region source;
struct dm_io_region source;
/*
* The destinations for the transfer.
*/
unsigned int num_dests;
struct io_region dests[KCOPYD_MAX_REGIONS];
struct dm_io_region dests[DM_KCOPYD_MAX_REGIONS];
sector_t offset;
unsigned int nr_pages;
@ -191,7 +205,7 @@ struct kcopyd_job {
* Set this to ensure you are notified when the job has
* completed. 'context' is for callback to use.
*/
kcopyd_notify_fn fn;
dm_kcopyd_notify_fn fn;
void *context;
/*
@ -207,47 +221,19 @@ struct kcopyd_job {
#define MIN_JOBS 512
static struct kmem_cache *_job_cache;
static mempool_t *_job_pool;
/*
* We maintain three lists of jobs:
*
* i) jobs waiting for pages
* ii) jobs that have pages, and are waiting for the io to be issued.
* iii) jobs that have completed.
*
* All three of these are protected by job_lock.
*/
static DEFINE_SPINLOCK(_job_lock);
static LIST_HEAD(_complete_jobs);
static LIST_HEAD(_io_jobs);
static LIST_HEAD(_pages_jobs);
static int jobs_init(void)
int __init dm_kcopyd_init(void)
{
_job_cache = KMEM_CACHE(kcopyd_job, 0);
if (!_job_cache)
return -ENOMEM;
_job_pool = mempool_create_slab_pool(MIN_JOBS, _job_cache);
if (!_job_pool) {
kmem_cache_destroy(_job_cache);
return -ENOMEM;
}
return 0;
}
static void jobs_exit(void)
void dm_kcopyd_exit(void)
{
BUG_ON(!list_empty(&_complete_jobs));
BUG_ON(!list_empty(&_io_jobs));
BUG_ON(!list_empty(&_pages_jobs));
mempool_destroy(_job_pool);
kmem_cache_destroy(_job_cache);
_job_pool = NULL;
_job_cache = NULL;
}
@ -255,18 +241,19 @@ static void jobs_exit(void)
* Functions to push and pop a job onto the head of a given job
* list.
*/
static struct kcopyd_job *pop(struct list_head *jobs)
static struct kcopyd_job *pop(struct list_head *jobs,
struct dm_kcopyd_client *kc)
{
struct kcopyd_job *job = NULL;
unsigned long flags;
spin_lock_irqsave(&_job_lock, flags);
spin_lock_irqsave(&kc->job_lock, flags);
if (!list_empty(jobs)) {
job = list_entry(jobs->next, struct kcopyd_job, list);
list_del(&job->list);
}
spin_unlock_irqrestore(&_job_lock, flags);
spin_unlock_irqrestore(&kc->job_lock, flags);
return job;
}
@ -274,10 +261,11 @@ static struct kcopyd_job *pop(struct list_head *jobs)
static void push(struct list_head *jobs, struct kcopyd_job *job)
{
unsigned long flags;
struct dm_kcopyd_client *kc = job->kc;
spin_lock_irqsave(&_job_lock, flags);
spin_lock_irqsave(&kc->job_lock, flags);
list_add_tail(&job->list, jobs);
spin_unlock_irqrestore(&_job_lock, flags);
spin_unlock_irqrestore(&kc->job_lock, flags);
}
/*
@ -294,11 +282,11 @@ static int run_complete_job(struct kcopyd_job *job)
void *context = job->context;
int read_err = job->read_err;
unsigned long write_err = job->write_err;
kcopyd_notify_fn fn = job->fn;
struct kcopyd_client *kc = job->kc;
dm_kcopyd_notify_fn fn = job->fn;
struct dm_kcopyd_client *kc = job->kc;
kcopyd_put_pages(kc, job->pages);
mempool_free(job, _job_pool);
mempool_free(job, kc->job_pool);
fn(read_err, write_err, context);
if (atomic_dec_and_test(&kc->nr_jobs))
@ -310,6 +298,7 @@ static int run_complete_job(struct kcopyd_job *job)
static void complete_io(unsigned long error, void *context)
{
struct kcopyd_job *job = (struct kcopyd_job *) context;
struct dm_kcopyd_client *kc = job->kc;
if (error) {
if (job->rw == WRITE)
@ -317,22 +306,22 @@ static void complete_io(unsigned long error, void *context)
else
job->read_err = 1;
if (!test_bit(KCOPYD_IGNORE_ERROR, &job->flags)) {
push(&_complete_jobs, job);
wake();
if (!test_bit(DM_KCOPYD_IGNORE_ERROR, &job->flags)) {
push(&kc->complete_jobs, job);
wake(kc);
return;
}
}
if (job->rw == WRITE)
push(&_complete_jobs, job);
push(&kc->complete_jobs, job);
else {
job->rw = WRITE;
push(&_io_jobs, job);
push(&kc->io_jobs, job);
}
wake();
wake(kc);
}
/*
@ -343,7 +332,7 @@ static int run_io_job(struct kcopyd_job *job)
{
int r;
struct dm_io_request io_req = {
.bi_rw = job->rw,
.bi_rw = job->rw | (1 << BIO_RW_SYNC),
.mem.type = DM_IO_PAGE_LIST,
.mem.ptr.pl = job->pages,
.mem.offset = job->offset,
@ -369,7 +358,7 @@ static int run_pages_job(struct kcopyd_job *job)
r = kcopyd_get_pages(job->kc, job->nr_pages, &job->pages);
if (!r) {
/* this job is ready for io */
push(&_io_jobs, job);
push(&job->kc->io_jobs, job);
return 0;
}
@ -384,12 +373,13 @@ static int run_pages_job(struct kcopyd_job *job)
* Run through a list for as long as possible. Returns the count
* of successful jobs.
*/
static int process_jobs(struct list_head *jobs, int (*fn) (struct kcopyd_job *))
static int process_jobs(struct list_head *jobs, struct dm_kcopyd_client *kc,
int (*fn) (struct kcopyd_job *))
{
struct kcopyd_job *job;
int r, count = 0;
while ((job = pop(jobs))) {
while ((job = pop(jobs, kc))) {
r = fn(job);
@ -399,7 +389,7 @@ static int process_jobs(struct list_head *jobs, int (*fn) (struct kcopyd_job *))
job->write_err = (unsigned long) -1L;
else
job->read_err = 1;
push(&_complete_jobs, job);
push(&kc->complete_jobs, job);
break;
}
@ -421,8 +411,11 @@ static int process_jobs(struct list_head *jobs, int (*fn) (struct kcopyd_job *))
/*
* kcopyd does this every time it's woken up.
*/
static void do_work(struct work_struct *ignored)
static void do_work(struct work_struct *work)
{
struct dm_kcopyd_client *kc = container_of(work,
struct dm_kcopyd_client, kcopyd_work);
/*
* The order that these are called is *very* important.
* complete jobs can free some pages for pages jobs.
@ -430,9 +423,9 @@ static void do_work(struct work_struct *ignored)
* list. io jobs call wake when they complete and it all
* starts again.
*/
process_jobs(&_complete_jobs, run_complete_job);
process_jobs(&_pages_jobs, run_pages_job);
process_jobs(&_io_jobs, run_io_job);
process_jobs(&kc->complete_jobs, kc, run_complete_job);
process_jobs(&kc->pages_jobs, kc, run_pages_job);
process_jobs(&kc->io_jobs, kc, run_io_job);
}
/*
@ -442,9 +435,10 @@ static void do_work(struct work_struct *ignored)
*/
static void dispatch_job(struct kcopyd_job *job)
{
atomic_inc(&job->kc->nr_jobs);
push(&_pages_jobs, job);
wake();
struct dm_kcopyd_client *kc = job->kc;
atomic_inc(&kc->nr_jobs);
push(&kc->pages_jobs, job);
wake(kc);
}
#define SUB_JOB_SIZE 128
@ -469,7 +463,7 @@ static void segment_complete(int read_err, unsigned long write_err,
* Only dispatch more work if there hasn't been an error.
*/
if ((!job->read_err && !job->write_err) ||
test_bit(KCOPYD_IGNORE_ERROR, &job->flags)) {
test_bit(DM_KCOPYD_IGNORE_ERROR, &job->flags)) {
/* get the next chunk of work */
progress = job->progress;
count = job->source.count - progress;
@ -484,7 +478,8 @@ static void segment_complete(int read_err, unsigned long write_err,
if (count) {
int i;
struct kcopyd_job *sub_job = mempool_alloc(_job_pool, GFP_NOIO);
struct kcopyd_job *sub_job = mempool_alloc(job->kc->job_pool,
GFP_NOIO);
*sub_job = *job;
sub_job->source.sector += progress;
@ -508,7 +503,7 @@ static void segment_complete(int read_err, unsigned long write_err,
* after we've completed.
*/
job->fn(read_err, write_err, job->context);
mempool_free(job, _job_pool);
mempool_free(job, job->kc->job_pool);
}
}
@ -526,16 +521,16 @@ static void split_job(struct kcopyd_job *job)
segment_complete(0, 0u, job);
}
int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
unsigned int num_dests, struct io_region *dests,
unsigned int flags, kcopyd_notify_fn fn, void *context)
int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
unsigned int num_dests, struct dm_io_region *dests,
unsigned int flags, dm_kcopyd_notify_fn fn, void *context)
{
struct kcopyd_job *job;
/*
* Allocate a new job.
*/
job = mempool_alloc(_job_pool, GFP_NOIO);
job = mempool_alloc(kc->job_pool, GFP_NOIO);
/*
* set up for the read.
@ -569,6 +564,7 @@ int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
return 0;
}
EXPORT_SYMBOL(dm_kcopyd_copy);
/*
* Cancels a kcopyd job, eg. someone might be deactivating a
@ -583,126 +579,76 @@ int kcopyd_cancel(struct kcopyd_job *job, int block)
#endif /* 0 */
/*-----------------------------------------------------------------
* Unit setup
* Client setup
*---------------------------------------------------------------*/
static DEFINE_MUTEX(_client_lock);
static LIST_HEAD(_clients);
static void client_add(struct kcopyd_client *kc)
int dm_kcopyd_client_create(unsigned int nr_pages,
struct dm_kcopyd_client **result)
{
mutex_lock(&_client_lock);
list_add(&kc->list, &_clients);
mutex_unlock(&_client_lock);
}
static void client_del(struct kcopyd_client *kc)
{
mutex_lock(&_client_lock);
list_del(&kc->list);
mutex_unlock(&_client_lock);
}
static DEFINE_MUTEX(kcopyd_init_lock);
static int kcopyd_clients = 0;
static int kcopyd_init(void)
{
int r;
mutex_lock(&kcopyd_init_lock);
if (kcopyd_clients) {
/* Already initialized. */
kcopyd_clients++;
mutex_unlock(&kcopyd_init_lock);
return 0;
}
r = jobs_init();
if (r) {
mutex_unlock(&kcopyd_init_lock);
return r;
}
_kcopyd_wq = create_singlethread_workqueue("kcopyd");
if (!_kcopyd_wq) {
jobs_exit();
mutex_unlock(&kcopyd_init_lock);
return -ENOMEM;
}
kcopyd_clients++;
INIT_WORK(&_kcopyd_work, do_work);
mutex_unlock(&kcopyd_init_lock);
return 0;
}
static void kcopyd_exit(void)
{
mutex_lock(&kcopyd_init_lock);
kcopyd_clients--;
if (!kcopyd_clients) {
jobs_exit();
destroy_workqueue(_kcopyd_wq);
_kcopyd_wq = NULL;
}
mutex_unlock(&kcopyd_init_lock);
}
int kcopyd_client_create(unsigned int nr_pages, struct kcopyd_client **result)
{
int r = 0;
struct kcopyd_client *kc;
r = kcopyd_init();
if (r)
return r;
int r = -ENOMEM;
struct dm_kcopyd_client *kc;
kc = kmalloc(sizeof(*kc), GFP_KERNEL);
if (!kc) {
kcopyd_exit();
if (!kc)
return -ENOMEM;
}
spin_lock_init(&kc->lock);
spin_lock_init(&kc->job_lock);
INIT_LIST_HEAD(&kc->complete_jobs);
INIT_LIST_HEAD(&kc->io_jobs);
INIT_LIST_HEAD(&kc->pages_jobs);
kc->job_pool = mempool_create_slab_pool(MIN_JOBS, _job_cache);
if (!kc->job_pool)
goto bad_slab;
INIT_WORK(&kc->kcopyd_work, do_work);
kc->kcopyd_wq = create_singlethread_workqueue("kcopyd");
if (!kc->kcopyd_wq)
goto bad_workqueue;
kc->pages = NULL;
kc->nr_pages = kc->nr_free_pages = 0;
r = client_alloc_pages(kc, nr_pages);
if (r) {
kfree(kc);
kcopyd_exit();
return r;
}
if (r)
goto bad_client_pages;
kc->io_client = dm_io_client_create(nr_pages);
if (IS_ERR(kc->io_client)) {
r = PTR_ERR(kc->io_client);
client_free_pages(kc);
kfree(kc);
kcopyd_exit();
return r;
goto bad_io_client;
}
init_waitqueue_head(&kc->destroyq);
atomic_set(&kc->nr_jobs, 0);
client_add(kc);
*result = kc;
return 0;
}
void kcopyd_client_destroy(struct kcopyd_client *kc)
bad_io_client:
client_free_pages(kc);
bad_client_pages:
destroy_workqueue(kc->kcopyd_wq);
bad_workqueue:
mempool_destroy(kc->job_pool);
bad_slab:
kfree(kc);
return r;
}
EXPORT_SYMBOL(dm_kcopyd_client_create);
void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc)
{
/* Wait for completion of all jobs submitted by this client. */
wait_event(kc->destroyq, !atomic_read(&kc->nr_jobs));
BUG_ON(!list_empty(&kc->complete_jobs));
BUG_ON(!list_empty(&kc->io_jobs));
BUG_ON(!list_empty(&kc->pages_jobs));
destroy_workqueue(kc->kcopyd_wq);
dm_io_client_destroy(kc->io_client);
client_free_pages(kc);
client_del(kc);
mempool_destroy(kc->job_pool);
kfree(kc);
kcopyd_exit();
}
EXPORT_SYMBOL(kcopyd_client_create);
EXPORT_SYMBOL(kcopyd_client_destroy);
EXPORT_SYMBOL(kcopyd_copy);
EXPORT_SYMBOL(dm_kcopyd_client_destroy);

248
drivers/md/dm-log.c
View File

@ -1,5 +1,6 @@
/*
* Copyright (C) 2003 Sistina Software
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This file is released under the LGPL.
*/
@ -8,64 +9,58 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/dm-io.h>
#include <linux/dm-dirty-log.h>
#include "dm-log.h"
#include "dm-io.h"
#include "dm.h"
#define DM_MSG_PREFIX "mirror log"
#define DM_MSG_PREFIX "dirty region log"
struct dm_dirty_log_internal {
struct dm_dirty_log_type *type;
struct list_head list;
long use;
};
static LIST_HEAD(_log_types);
static DEFINE_SPINLOCK(_lock);
int dm_register_dirty_log_type(struct dirty_log_type *type)
static struct dm_dirty_log_internal *__find_dirty_log_type(const char *name)
{
spin_lock(&_lock);
type->use_count = 0;
list_add(&type->list, &_log_types);
spin_unlock(&_lock);
struct dm_dirty_log_internal *log_type;
return 0;
list_for_each_entry(log_type, &_log_types, list)
if (!strcmp(name, log_type->type->name))
return log_type;
return NULL;
}
int dm_unregister_dirty_log_type(struct dirty_log_type *type)
static struct dm_dirty_log_internal *_get_dirty_log_type(const char *name)
{
struct dm_dirty_log_internal *log_type;
spin_lock(&_lock);
if (type->use_count)
DMWARN("Attempt to unregister a log type that is still in use");
log_type = __find_dirty_log_type(name);
if (log_type) {
if (!log_type->use && !try_module_get(log_type->type->module))
log_type = NULL;
else
list_del(&type->list);
spin_unlock(&_lock);
return 0;
}
static struct dirty_log_type *_get_type(const char *type_name)
{
struct dirty_log_type *type;
spin_lock(&_lock);
list_for_each_entry (type, &_log_types, list)
if (!strcmp(type_name, type->name)) {
if (!type->use_count && !try_module_get(type->module)){
spin_unlock(&_lock);
return NULL;
}
type->use_count++;
spin_unlock(&_lock);
return type;
log_type->use++;
}
spin_unlock(&_lock);
return NULL;
return log_type;
}
/*
* get_type
* @type_name
*
* Attempt to retrieve the dirty_log_type by name. If not already
* Attempt to retrieve the dm_dirty_log_type by name. If not already
* available, attempt to load the appropriate module.
*
* Log modules are named "dm-log-" followed by the 'type_name'.
@ -78,14 +73,17 @@ static struct dirty_log_type *_get_type(const char *type_name)
*
* Returns: dirty_log_type* on success, NULL on failure
*/
static struct dirty_log_type *get_type(const char *type_name)
static struct dm_dirty_log_type *get_type(const char *type_name)
{
char *p, *type_name_dup;
struct dirty_log_type *type;
struct dm_dirty_log_internal *log_type;
type = _get_type(type_name);
if (type)
return type;
if (!type_name)
return NULL;
log_type = _get_dirty_log_type(type_name);
if (log_type)
return log_type->type;
type_name_dup = kstrdup(type_name, GFP_KERNEL);
if (!type_name_dup) {
@ -95,34 +93,106 @@ static struct dirty_log_type *get_type(const char *type_name)
}
while (request_module("dm-log-%s", type_name_dup) ||
!(type = _get_type(type_name))) {
!(log_type = _get_dirty_log_type(type_name))) {
p = strrchr(type_name_dup, '-');
if (!p)
break;
p[0] = '\0';
}
if (!type)
if (!log_type)
DMWARN("Module for logging type \"%s\" not found.", type_name);
kfree(type_name_dup);
return type;
return log_type ? log_type->type : NULL;
}
static void put_type(struct dirty_log_type *type)
static void put_type(struct dm_dirty_log_type *type)
{
struct dm_dirty_log_internal *log_type;
if (!type)
return;
spin_lock(&_lock);
if (!--type->use_count)
log_type = __find_dirty_log_type(type->name);
if (!log_type)
goto out;
if (!--log_type->use)
module_put(type->module);
BUG_ON(log_type->use < 0);
out:
spin_unlock(&_lock);
}
struct dirty_log *dm_create_dirty_log(const char *type_name, struct dm_target *ti,
static struct dm_dirty_log_internal *_alloc_dirty_log_type(struct dm_dirty_log_type *type)
{
struct dm_dirty_log_internal *log_type = kzalloc(sizeof(*log_type),
GFP_KERNEL);
if (log_type)
log_type->type = type;
return log_type;
}
int dm_dirty_log_type_register(struct dm_dirty_log_type *type)
{
struct dm_dirty_log_internal *log_type = _alloc_dirty_log_type(type);
int r = 0;
if (!log_type)
return -ENOMEM;
spin_lock(&_lock);
if (!__find_dirty_log_type(type->name))
list_add(&log_type->list, &_log_types);
else {
kfree(log_type);
r = -EEXIST;
}
spin_unlock(&_lock);
return r;
}
EXPORT_SYMBOL(dm_dirty_log_type_register);
int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type)
{
struct dm_dirty_log_internal *log_type;
spin_lock(&_lock);
log_type = __find_dirty_log_type(type->name);
if (!log_type) {
spin_unlock(&_lock);
return -EINVAL;
}
if (log_type->use) {
spin_unlock(&_lock);
return -ETXTBSY;
}
list_del(&log_type->list);
spin_unlock(&_lock);
kfree(log_type);
return 0;
}
EXPORT_SYMBOL(dm_dirty_log_type_unregister);
struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
struct dm_target *ti,
unsigned int argc, char **argv)
{
struct dirty_log_type *type;
struct dirty_log *log;
struct dm_dirty_log_type *type;
struct dm_dirty_log *log;
log = kmalloc(sizeof(*log), GFP_KERNEL);
if (!log)
@ -143,13 +213,15 @@ struct dirty_log *dm_create_dirty_log(const char *type_name, struct dm_target *t
return log;
}
EXPORT_SYMBOL(dm_dirty_log_create);
void dm_destroy_dirty_log(struct dirty_log *log)
void dm_dirty_log_destroy(struct dm_dirty_log *log)
{
log->type->dtr(log);
put_type(log->type);
kfree(log);
}
EXPORT_SYMBOL(dm_dirty_log_destroy);
/*-----------------------------------------------------------------
* Persistent and core logs share a lot of their implementation.
@ -207,7 +279,7 @@ struct log_c {
struct dm_dev *log_dev;
struct log_header header;
struct io_region header_location;
struct dm_io_region header_location;
struct log_header *disk_header;
};
@ -302,7 +374,7 @@ static inline int write_header(struct log_c *log)
* argv contains region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
#define BYTE_SHIFT 3
static int create_log_context(struct dirty_log *log, struct dm_target *ti,
static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv,
struct dm_dev *dev)
{
@ -315,7 +387,7 @@ static int create_log_context(struct dirty_log *log, struct dm_target *ti,
int r;
if (argc < 1 || argc > 2) {
DMWARN("wrong number of arguments to mirror log");
DMWARN("wrong number of arguments to dirty region log");
return -EINVAL;
}
@ -325,8 +397,8 @@ static int create_log_context(struct dirty_log *log, struct dm_target *ti,
else if (!strcmp(argv[1], "nosync"))
sync = NOSYNC;
else {
DMWARN("unrecognised sync argument to mirror log: %s",
argv[1]);
DMWARN("unrecognised sync argument to "
"dirty region log: %s", argv[1]);
return -EINVAL;
}
}
@ -434,7 +506,7 @@ static int create_log_context(struct dirty_log *log, struct dm_target *ti,
return 0;
}
static int core_ctr(struct dirty_log *log, struct dm_target *ti,
static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
return create_log_context(log, ti, argc, argv, NULL);
@ -447,7 +519,7 @@ static void destroy_log_context(struct log_c *lc)
kfree(lc);
}
static void core_dtr(struct dirty_log *log)
static void core_dtr(struct dm_dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
@ -460,14 +532,14 @@ static void core_dtr(struct dirty_log *log)
*
* argv contains log_device region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
int r;
struct dm_dev *dev;
if (argc < 2 || argc > 3) {
DMWARN("wrong number of arguments to disk mirror log");
DMWARN("wrong number of arguments to disk dirty region log");
return -EINVAL;
}
@ -485,7 +557,7 @@ static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
return 0;
}
static void disk_dtr(struct dirty_log *log)
static void disk_dtr(struct dm_dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
@ -514,7 +586,7 @@ static void fail_log_device(struct log_c *lc)
dm_table_event(lc->ti->table);
}
static int disk_resume(struct dirty_log *log)
static int disk_resume(struct dm_dirty_log *log)
{
int r;
unsigned i;
@ -524,7 +596,7 @@ static int disk_resume(struct dirty_log *log)
/* read the disk header */
r = read_header(lc);
if (r) {
DMWARN("%s: Failed to read header on mirror log device",
DMWARN("%s: Failed to read header on dirty region log device",
lc->log_dev->name);
fail_log_device(lc);
/*
@ -562,7 +634,7 @@ static int disk_resume(struct dirty_log *log)
/* write the new header */
r = write_header(lc);
if (r) {
DMWARN("%s: Failed to write header on mirror log device",
DMWARN("%s: Failed to write header on dirty region log device",
lc->log_dev->name);
fail_log_device(lc);
}
@ -570,38 +642,38 @@ static int disk_resume(struct dirty_log *log)
return r;
}
static uint32_t core_get_region_size(struct dirty_log *log)
static uint32_t core_get_region_size(struct dm_dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
return lc->region_size;
}
static int core_resume(struct dirty_log *log)
static int core_resume(struct dm_dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
lc->sync_search = 0;
return 0;
}
static int core_is_clean(struct dirty_log *log, region_t region)
static int core_is_clean(struct dm_dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
return log_test_bit(lc->clean_bits, region);
}
static int core_in_sync(struct dirty_log *log, region_t region, int block)
static int core_in_sync(struct dm_dirty_log *log, region_t region, int block)
{
struct log_c *lc = (struct log_c *) log->context;
return log_test_bit(lc->sync_bits, region);
}
static int core_flush(struct dirty_log *log)
static int core_flush(struct dm_dirty_log *log)
{
/* no op */
return 0;
}
static int disk_flush(struct dirty_log *log)
static int disk_flush(struct dm_dirty_log *log)
{
int r;
struct log_c *lc = (struct log_c *) log->context;
@ -619,19 +691,19 @@ static int disk_flush(struct dirty_log *log)
return r;
}
static void core_mark_region(struct dirty_log *log, region_t region)
static void core_mark_region(struct dm_dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
log_clear_bit(lc, lc->clean_bits, region);
}
static void core_clear_region(struct dirty_log *log, region_t region)
static void core_clear_region(struct dm_dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
log_set_bit(lc, lc->clean_bits, region);
}
static int core_get_resync_work(struct dirty_log *log, region_t *region)
static int core_get_resync_work(struct dm_dirty_log *log, region_t *region)
{
struct log_c *lc = (struct log_c *) log->context;
@ -654,7 +726,7 @@ static int core_get_resync_work(struct dirty_log *log, region_t *region)
return 1;
}
static void core_set_region_sync(struct dirty_log *log, region_t region,
static void core_set_region_sync(struct dm_dirty_log *log, region_t region,
int in_sync)
{
struct log_c *lc = (struct log_c *) log->context;
@ -669,7 +741,7 @@ static void core_set_region_sync(struct dirty_log *log, region_t region,
}
}
static region_t core_get_sync_count(struct dirty_log *log)
static region_t core_get_sync_count(struct dm_dirty_log *log)
{
struct log_c *lc = (struct log_c *) log->context;
@ -680,7 +752,7 @@ static region_t core_get_sync_count(struct dirty_log *log)
if (lc->sync != DEFAULTSYNC) \
DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "")
static int core_status(struct dirty_log *log, status_type_t status,
static int core_status(struct dm_dirty_log *log, status_type_t status,
char *result, unsigned int maxlen)
{
int sz = 0;
@ -700,7 +772,7 @@ static int core_status(struct dirty_log *log, status_type_t status,
return sz;
}
static int disk_status(struct dirty_log *log, status_type_t status,
static int disk_status(struct dm_dirty_log *log, status_type_t status,
char *result, unsigned int maxlen)
{
int sz = 0;
@ -722,7 +794,7 @@ static int disk_status(struct dirty_log *log, status_type_t status,
return sz;
}
static struct dirty_log_type _core_type = {
static struct dm_dirty_log_type _core_type = {
.name = "core",
.module = THIS_MODULE,
.ctr = core_ctr,
@ -740,7 +812,7 @@ static struct dirty_log_type _core_type = {
.status = core_status,
};
static struct dirty_log_type _disk_type = {
static struct dm_dirty_log_type _disk_type = {
.name = "disk",
.module = THIS_MODULE,
.ctr = disk_ctr,
@ -763,26 +835,28 @@ int __init dm_dirty_log_init(void)
{
int r;
r = dm_register_dirty_log_type(&_core_type);
r = dm_dirty_log_type_register(&_core_type);
if (r)
DMWARN("couldn't register core log");
r = dm_register_dirty_log_type(&_disk_type);
r = dm_dirty_log_type_register(&_disk_type);
if (r) {
DMWARN("couldn't register disk type");
dm_unregister_dirty_log_type(&_core_type);
dm_dirty_log_type_unregister(&_core_type);
}
return r;
}
void dm_dirty_log_exit(void)
void __exit dm_dirty_log_exit(void)
{
dm_unregister_dirty_log_type(&_disk_type);
dm_unregister_dirty_log_type(&_core_type);
dm_dirty_log_type_unregister(&_disk_type);
dm_dirty_log_type_unregister(&_core_type);
}
EXPORT_SYMBOL(dm_register_dirty_log_type);
EXPORT_SYMBOL(dm_unregister_dirty_log_type);
EXPORT_SYMBOL(dm_create_dirty_log);
EXPORT_SYMBOL(dm_destroy_dirty_log);
module_init(dm_dirty_log_init);
module_exit(dm_dirty_log_exit);
MODULE_DESCRIPTION(DM_NAME " dirty region log");
MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>");
MODULE_LICENSE("GPL");

132
drivers/md/dm-raid1.c
View File

@ -7,9 +7,6 @@
#include "dm.h"
#include "dm-bio-list.h"
#include "dm-bio-record.h"
#include "dm-io.h"
#include "dm-log.h"
#include "kcopyd.h"
#include <linux/ctype.h>
#include <linux/init.h>
@ -22,6 +19,9 @@
#include <linux/workqueue.h>
#include <linux/log2.h>
#include <linux/hardirq.h>
#include <linux/dm-io.h>
#include <linux/dm-dirty-log.h>
#include <linux/dm-kcopyd.h>
#define DM_MSG_PREFIX "raid1"
#define DM_IO_PAGES 64
@ -74,7 +74,7 @@ struct region_hash {
unsigned region_shift;
/* holds persistent region state */
struct dirty_log *log;
struct dm_dirty_log *log;
/* hash table */
rwlock_t hash_lock;
@ -133,7 +133,7 @@ struct mirror_set {
struct dm_target *ti;
struct list_head list;
struct region_hash rh;
struct kcopyd_client *kcopyd_client;
struct dm_kcopyd_client *kcopyd_client;
uint64_t features;
spinlock_t lock; /* protects the lists */
@ -154,6 +154,9 @@ struct mirror_set {
struct workqueue_struct *kmirrord_wq;
struct work_struct kmirrord_work;
struct timer_list timer;
unsigned long timer_pending;
struct work_struct trigger_event;
unsigned int nr_mirrors;
@ -178,13 +181,32 @@ static void wake(struct mirror_set *ms)
queue_work(ms->kmirrord_wq, &ms->kmirrord_work);
}
static void delayed_wake_fn(unsigned long data)
{
struct mirror_set *ms = (struct mirror_set *) data;
clear_bit(0, &ms->timer_pending);
wake(ms);
}
static void delayed_wake(struct mirror_set *ms)
{
if (test_and_set_bit(0, &ms->timer_pending))
return;
ms->timer.expires = jiffies + HZ / 5;
ms->timer.data = (unsigned long) ms;
ms->timer.function = delayed_wake_fn;
add_timer(&ms->timer);
}
/* FIXME move this */
static void queue_bio(struct mirror_set *ms, struct bio *bio, int rw);
#define MIN_REGIONS 64
#define MAX_RECOVERY 1
static int rh_init(struct region_hash *rh, struct mirror_set *ms,
struct dirty_log *log, uint32_t region_size,
struct dm_dirty_log *log, uint32_t region_size,
region_t nr_regions)
{
unsigned int nr_buckets, max_buckets;
@ -249,7 +271,7 @@ static void rh_exit(struct region_hash *rh)
}
if (rh->log)
dm_destroy_dirty_log(rh->log);
dm_dirty_log_destroy(rh->log);
if (rh->region_pool)
mempool_destroy(rh->region_pool);
vfree(rh->buckets);
@ -405,24 +427,22 @@ static void rh_update_states(struct region_hash *rh)
write_lock_irq(&rh->hash_lock);
spin_lock(&rh->region_lock);
if (!list_empty(&rh->clean_regions)) {
list_splice(&rh->clean_regions, &clean);
INIT_LIST_HEAD(&rh->clean_regions);
list_splice_init(&rh->clean_regions, &clean);
list_for_each_entry(reg, &clean, list)
list_del(&reg->hash_list);
}
if (!list_empty(&rh->recovered_regions)) {
list_splice(&rh->recovered_regions, &recovered);
INIT_LIST_HEAD(&rh->recovered_regions);
list_splice_init(&rh->recovered_regions, &recovered);
list_for_each_entry (reg, &recovered, list)
list_del(&reg->hash_list);
}
if (!list_empty(&rh->failed_recovered_regions)) {
list_splice(&rh->failed_recovered_regions, &failed_recovered);
INIT_LIST_HEAD(&rh->failed_recovered_regions);
list_splice_init(&rh->failed_recovered_regions,
&failed_recovered);
list_for_each_entry(reg, &failed_recovered, list)
list_del(&reg->hash_list);
@ -790,7 +810,7 @@ static int recover(struct mirror_set *ms, struct region *reg)
{
int r;
unsigned int i;
struct io_region from, to[KCOPYD_MAX_REGIONS], *dest;
struct dm_io_region from, to[DM_KCOPYD_MAX_REGIONS], *dest;
struct mirror *m;
unsigned long flags = 0;
@ -822,9 +842,9 @@ static int recover(struct mirror_set *ms, struct region *reg)
}
/* hand to kcopyd */
set_bit(KCOPYD_IGNORE_ERROR, &flags);
r = kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to, flags,
recovery_complete, reg);
set_bit(DM_KCOPYD_IGNORE_ERROR, &flags);
r = dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to,
flags, recovery_complete, reg);
return r;
}
@ -833,7 +853,7 @@ static void do_recovery(struct mirror_set *ms)
{
int r;
struct region *reg;
struct dirty_log *log = ms->rh.log;
struct dm_dirty_log *log = ms->rh.log;
/*
* Start quiescing some regions.
@ -909,7 +929,7 @@ static void map_bio(struct mirror *m, struct bio *bio)
bio->bi_sector = map_sector(m, bio);
}
static void map_region(struct io_region *io, struct mirror *m,
static void map_region(struct dm_io_region *io, struct mirror *m,
struct bio *bio)
{
io->bdev = m->dev->bdev;
@ -951,7 +971,7 @@ static void read_callback(unsigned long error, void *context)
/* Asynchronous read. */
static void read_async_bio(struct mirror *m, struct bio *bio)
{
struct io_region io;
struct dm_io_region io;
struct dm_io_request io_req = {
.bi_rw = READ,
.mem.type = DM_IO_BVEC,
@ -1019,7 +1039,7 @@ static void __bio_mark_nosync(struct mirror_set *ms,
{
unsigned long flags;
struct region_hash *rh = &ms->rh;
struct dirty_log *log = ms->rh.log;
struct dm_dirty_log *log = ms->rh.log;
struct region *reg;
region_t region = bio_to_region(rh, bio);
int recovering = 0;
@ -1107,7 +1127,7 @@ out:
static void do_write(struct mirror_set *ms, struct bio *bio)
{
unsigned int i;
struct io_region io[ms->nr_mirrors], *dest = io;
struct dm_io_region io[ms->nr_mirrors], *dest = io;
struct mirror *m;
struct dm_io_request io_req = {
.bi_rw = WRITE,
@ -1182,6 +1202,7 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes)
spin_lock_irq(&ms->lock);
bio_list_merge(&ms->failures, &sync);
spin_unlock_irq(&ms->lock);
wake(ms);
} else
while ((bio = bio_list_pop(&sync)))
do_write(ms, bio);
@ -1241,7 +1262,7 @@ static void do_failures(struct mirror_set *ms, struct bio_list *failures)
bio_list_merge(&ms->failures, failures);
spin_unlock_irq(&ms->lock);
wake(ms);
delayed_wake(ms);
}
static void trigger_event(struct work_struct *work)
@ -1255,7 +1276,7 @@ static void trigger_event(struct work_struct *work)
/*-----------------------------------------------------------------
* kmirrord
*---------------------------------------------------------------*/
static int _do_mirror(struct work_struct *work)
static void do_mirror(struct work_struct *work)
{
struct mirror_set *ms =container_of(work, struct mirror_set,
kmirrord_work);
@ -1277,23 +1298,7 @@ static int _do_mirror(struct work_struct *work)
do_writes(ms, &writes);
do_failures(ms, &failures);
return (ms->failures.head) ? 1 : 0;
}
static void do_mirror(struct work_struct *work)
{
/*
* If _do_mirror returns 1, we give it
* another shot. This helps for cases like
* 'suspend' where we call flush_workqueue
* and expect all work to be finished. If
* a failure happens during a suspend, we
* couldn't issue a 'wake' because it would
* not be honored. Therefore, we return '1'
* from _do_mirror, and retry here.
*/
while (_do_mirror(work))
schedule();
dm_table_unplug_all(ms->ti->table);
}
@ -1303,7 +1308,7 @@ static void do_mirror(struct work_struct *work)
static struct mirror_set *alloc_context(unsigned int nr_mirrors,
uint32_t region_size,
struct dm_target *ti,
struct dirty_log *dl)
struct dm_dirty_log *dl)
{
size_t len;
struct mirror_set *ms = NULL;
@ -1403,12 +1408,12 @@ static int get_mirror(struct mirror_set *ms, struct dm_target *ti,
/*
* Create dirty log: log_type #log_params <log_params>
*/
static struct dirty_log *create_dirty_log(struct dm_target *ti,
static struct dm_dirty_log *create_dirty_log(struct dm_target *ti,
unsigned int argc, char **argv,
unsigned int *args_used)
{
unsigned int param_count;
struct dirty_log *dl;
struct dm_dirty_log *dl;
if (argc < 2) {
ti->error = "Insufficient mirror log arguments";
@ -1427,7 +1432,7 @@ static struct dirty_log *create_dirty_log(struct dm_target *ti,
return NULL;
}
dl = dm_create_dirty_log(argv[0], ti, param_count, argv + 2);
dl = dm_dirty_log_create(argv[0], ti, param_count, argv + 2);
if (!dl) {
ti->error = "Error creating mirror dirty log";
return NULL;
@ -1435,7 +1440,7 @@ static struct dirty_log *create_dirty_log(struct dm_target *ti,
if (!_check_region_size(ti, dl->type->get_region_size(dl))) {
ti->error = "Invalid region size";
dm_destroy_dirty_log(dl);
dm_dirty_log_destroy(dl);
return NULL;
}
@ -1496,7 +1501,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
int r;
unsigned int nr_mirrors, m, args_used;
struct mirror_set *ms;
struct dirty_log *dl;
struct dm_dirty_log *dl;
dl = create_dirty_log(ti, argc, argv, &args_used);
if (!dl)
@ -1506,9 +1511,9 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
argc -= args_used;
if (!argc || sscanf(argv[0], "%u", &nr_mirrors) != 1 ||
nr_mirrors < 2 || nr_mirrors > KCOPYD_MAX_REGIONS + 1) {
nr_mirrors < 2 || nr_mirrors > DM_KCOPYD_MAX_REGIONS + 1) {
ti->error = "Invalid number of mirrors";
dm_destroy_dirty_log(dl);
dm_dirty_log_destroy(dl);
return -EINVAL;
}
@ -1516,13 +1521,13 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (argc < nr_mirrors * 2) {
ti->error = "Too few mirror arguments";
dm_destroy_dirty_log(dl);
dm_dirty_log_destroy(dl);
return -EINVAL;
}
ms = alloc_context(nr_mirrors, dl->type->get_region_size(dl), ti, dl);
if (!ms) {
dm_destroy_dirty_log(dl);
dm_dirty_log_destroy(dl);
return -ENOMEM;
}
@ -1547,6 +1552,8 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto err_free_context;
}
INIT_WORK(&ms->kmirrord_work, do_mirror);
init_timer(&ms->timer);
ms->timer_pending = 0;
INIT_WORK(&ms->trigger_event, trigger_event);
r = parse_features(ms, argc, argv, &args_used);
@ -1571,7 +1578,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto err_destroy_wq;
}
r = kcopyd_client_create(DM_IO_PAGES, &ms->kcopyd_client);
r = dm_kcopyd_client_create(DM_IO_PAGES, &ms->kcopyd_client);
if (r)
goto err_destroy_wq;
@ -1589,8 +1596,9 @@ static void mirror_dtr(struct dm_target *ti)
{
struct mirror_set *ms = (struct mirror_set *) ti->private;
del_timer_sync(&ms->timer);
flush_workqueue(ms->kmirrord_wq);
kcopyd_client_destroy(ms->kcopyd_client);
dm_kcopyd_client_destroy(ms->kcopyd_client);
destroy_workqueue(ms->kmirrord_wq);
free_context(ms, ti, ms->nr_mirrors);
}
@ -1734,7 +1742,7 @@ out:
static void mirror_presuspend(struct dm_target *ti)
{
struct mirror_set *ms = (struct mirror_set *) ti->private;
struct dirty_log *log = ms->rh.log;
struct dm_dirty_log *log = ms->rh.log;
atomic_set(&ms->suspend, 1);
@ -1763,7 +1771,7 @@ static void mirror_presuspend(struct dm_target *ti)
static void mirror_postsuspend(struct dm_target *ti)
{
struct mirror_set *ms = ti->private;
struct dirty_log *log = ms->rh.log;
struct dm_dirty_log *log = ms->rh.log;
if (log->type->postsuspend && log->type->postsuspend(log))
/* FIXME: need better error handling */
@ -1773,7 +1781,7 @@ static void mirror_postsuspend(struct dm_target *ti)
static void mirror_resume(struct dm_target *ti)
{
struct mirror_set *ms = ti->private;
struct dirty_log *log = ms->rh.log;
struct dm_dirty_log *log = ms->rh.log;
atomic_set(&ms->suspend, 0);
if (log->type->resume && log->type->resume(log))
@ -1811,7 +1819,7 @@ static int mirror_status(struct dm_target *ti, status_type_t type,
{
unsigned int m, sz = 0;
struct mirror_set *ms = (struct mirror_set *) ti->private;
struct dirty_log *log = ms->rh.log;
struct dm_dirty_log *log = ms->rh.log;
char buffer[ms->nr_mirrors + 1];
switch (type) {
@ -1864,15 +1872,9 @@ static int __init dm_mirror_init(void)
{
int r;
r = dm_dirty_log_init();
if (r)
return r;
r = dm_register_target(&mirror_target);
if (r < 0) {
if (r < 0)
DMERR("Failed to register mirror target");
dm_dirty_log_exit();
}
return r;
}
@ -1884,8 +1886,6 @@ static void __exit dm_mirror_exit(void)
r = dm_unregister_target(&mirror_target);
if (r < 0)
DMERR("unregister failed %d", r);
dm_dirty_log_exit();
}
/* Module hooks */

22
drivers/md/dm-snap.c
View File

@ -18,10 +18,10 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/log2.h>
#include <linux/dm-kcopyd.h>
#include "dm-snap.h"
#include "dm-bio-list.h"
#include "kcopyd.h"
#define DM_MSG_PREFIX "snapshots"
@ -36,9 +36,9 @@
#define SNAPSHOT_COPY_PRIORITY 2
/*
* Each snapshot reserves this many pages for io
* Reserve 1MB for each snapshot initially (with minimum of 1 page).
*/
#define SNAPSHOT_PAGES 256
#define SNAPSHOT_PAGES (((1UL << 20) >> PAGE_SHIFT) ? : 1)
static struct workqueue_struct *ksnapd;
static void flush_queued_bios(struct work_struct *work);
@ -536,7 +536,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
s->last_percent = 0;
init_rwsem(&s->lock);
spin_lock_init(&s->pe_lock);
s->table = ti->table;
s->ti = ti;
/* Allocate hash table for COW data */
if (init_hash_tables(s)) {
@ -558,7 +558,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad4;
}
r = kcopyd_client_create(SNAPSHOT_PAGES, &s->kcopyd_client);
r = dm_kcopyd_client_create(SNAPSHOT_PAGES, &s->kcopyd_client);
if (r) {
ti->error = "Could not create kcopyd client";
goto bad5;
@ -591,7 +591,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
return 0;
bad6:
kcopyd_client_destroy(s->kcopyd_client);
dm_kcopyd_client_destroy(s->kcopyd_client);
bad5:
s->store.destroy(&s->store);
@ -613,7 +613,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
static void __free_exceptions(struct dm_snapshot *s)
{
kcopyd_client_destroy(s->kcopyd_client);
dm_kcopyd_client_destroy(s->kcopyd_client);
s->kcopyd_client = NULL;
exit_exception_table(&s->pending, pending_cache);
@ -699,7 +699,7 @@ static void __invalidate_snapshot(struct dm_snapshot *s, int err)
s->valid = 0;
dm_table_event(s->table);
dm_table_event(s->ti->table);
}
static void get_pending_exception(struct dm_snap_pending_exception *pe)
@ -824,7 +824,7 @@ static void copy_callback(int read_err, unsigned long write_err, void *context)
static void start_copy(struct dm_snap_pending_exception *pe)
{
struct dm_snapshot *s = pe->snap;
struct io_region src, dest;
struct dm_io_region src, dest;
struct block_device *bdev = s->origin->bdev;
sector_t dev_size;
@ -839,7 +839,7 @@ static void start_copy(struct dm_snap_pending_exception *pe)
dest.count = src.count;
/* Hand over to kcopyd */
kcopyd_copy(s->kcopyd_client,
dm_kcopyd_copy(s->kcopyd_client,
&src, 1, &dest, 0, copy_callback, pe);
}
@ -1060,7 +1060,7 @@ static int __origin_write(struct list_head *snapshots, struct bio *bio)
goto next_snapshot;
/* Nothing to do if writing beyond end of snapshot */
if (bio->bi_sector >= dm_table_get_size(snap->table))
if (bio->bi_sector >= dm_table_get_size(snap->ti->table))
goto next_snapshot;
/*

4
drivers/md/dm-snap.h
View File

@ -132,7 +132,7 @@ struct exception_store {
struct dm_snapshot {
struct rw_semaphore lock;
struct dm_table *table;
struct dm_target *ti;
struct dm_dev *origin;
struct dm_dev *cow;
@ -169,7 +169,7 @@ struct dm_snapshot {
/* The on disk metadata handler */
struct exception_store store;
struct kcopyd_client *kcopyd_client;
struct dm_kcopyd_client *kcopyd_client;
/* Queue of snapshot writes for ksnapd to flush */
struct bio_list queued_bios;

42
drivers/md/dm-table.c
View File

@ -245,44 +245,6 @@ int dm_table_create(struct dm_table **result, int mode,
return 0;
}
int dm_create_error_table(struct dm_table **result, struct mapped_device *md)
{
struct dm_table *t;
sector_t dev_size = 1;
int r;
/*
* Find current size of device.
* Default to 1 sector if inactive.
*/
t = dm_get_table(md);
if (t) {
dev_size = dm_table_get_size(t);
dm_table_put(t);
}
r = dm_table_create(&t, FMODE_READ, 1, md);
if (r)
return r;
r = dm_table_add_target(t, "error", 0, dev_size, NULL);
if (r)
goto out;
r = dm_table_complete(t);
if (r)
goto out;
*result = t;
out:
if (r)
dm_table_put(t);
return r;
}
EXPORT_SYMBOL_GPL(dm_create_error_table);
static void free_devices(struct list_head *devices)
{
struct list_head *tmp, *next;
@ -954,7 +916,7 @@ void dm_table_presuspend_targets(struct dm_table *t)
if (!t)
return;
return suspend_targets(t, 0);
suspend_targets(t, 0);
}
void dm_table_postsuspend_targets(struct dm_table *t)
@ -962,7 +924,7 @@ void dm_table_postsuspend_targets(struct dm_table *t)
if (!t)
return;
return suspend_targets(t, 1);
suspend_targets(t, 1);
}
int dm_table_resume_targets(struct dm_table *t)

16
drivers/md/dm.c
View File

@ -204,6 +204,7 @@ static int (*_inits[])(void) __initdata = {
dm_target_init,
dm_linear_init,
dm_stripe_init,
dm_kcopyd_init,
dm_interface_init,
};
@ -212,6 +213,7 @@ static void (*_exits[])(void) = {
dm_target_exit,
dm_linear_exit,
dm_stripe_exit,
dm_kcopyd_exit,
dm_interface_exit,
};
@ -922,7 +924,7 @@ static void free_minor(int minor)
/*
* See if the device with a specific minor # is free.
*/
static int specific_minor(struct mapped_device *md, int minor)
static int specific_minor(int minor)
{
int r, m;
@ -955,7 +957,7 @@ out:
return r;
}
static int next_free_minor(struct mapped_device *md, int *minor)
static int next_free_minor(int *minor)
{
int r, m;
@ -966,9 +968,8 @@ static int next_free_minor(struct mapped_device *md, int *minor)
spin_lock(&_minor_lock);
r = idr_get_new(&_minor_idr, MINOR_ALLOCED, &m);
if (r) {
if (r)
goto out;
}
if (m >= (1 << MINORBITS)) {
idr_remove(&_minor_idr, m);
@ -991,7 +992,7 @@ static struct block_device_operations dm_blk_dops;
static struct mapped_device *alloc_dev(int minor)
{
int r;
struct mapped_device *md = kmalloc(sizeof(*md), GFP_KERNEL);
struct mapped_device *md = kzalloc(sizeof(*md), GFP_KERNEL);
void *old_md;
if (!md) {
@ -1004,13 +1005,12 @@ static struct mapped_device *alloc_dev(int minor)
/* get a minor number for the dev */
if (minor == DM_ANY_MINOR)
r = next_free_minor(md, &minor);
r = next_free_minor(&minor);
else
r = specific_minor(md, minor);
r = specific_minor(minor);
if (r < 0)
goto bad_minor;
memset(md, 0, sizeof(*md));
init_rwsem(&md->io_lock);
mutex_init(&md->suspend_lock);
spin_lock_init(&md->pushback_lock);

98
drivers/md/dm.h
View File

@ -16,67 +16,6 @@
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#define DM_NAME "device-mapper"
#define DMERR(f, arg...) \
printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMERR_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
f "\n", ## arg); \
} while (0)
#define DMWARN(f, arg...) \
printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMWARN_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
f "\n", ## arg); \
} while (0)
#define DMINFO(f, arg...) \
printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMINFO_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
"\n", ## arg); \
} while (0)
#ifdef CONFIG_DM_DEBUG
# define DMDEBUG(f, arg...) \
printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
# define DMDEBUG_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
"\n", ## arg); \
} while (0)
#else
# define DMDEBUG(f, arg...) do {} while (0)
# define DMDEBUG_LIMIT(f, arg...) do {} while (0)
#endif
#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
0 : scnprintf(result + sz, maxlen - sz, x))
#define SECTOR_SHIFT 9
/*
* Definitions of return values from target end_io function.
*/
#define DM_ENDIO_INCOMPLETE 1
#define DM_ENDIO_REQUEUE 2
/*
* Definitions of return values from target map function.
*/
#define DM_MAPIO_SUBMITTED 0
#define DM_MAPIO_REMAPPED 1
#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
/*
* Suspend feature flags
*/
@ -136,34 +75,6 @@ static inline int array_too_big(unsigned long fixed, unsigned long obj,
return (num > (ULONG_MAX - fixed) / obj);
}
/*
* Ceiling(n / sz)
*/
#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
#define dm_sector_div_up(n, sz) ( \
{ \
sector_t _r = ((n) + (sz) - 1); \
sector_div(_r, (sz)); \
_r; \
} \
)
/*
* ceiling(n / size) * size
*/
#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
static inline sector_t to_sector(unsigned long n)
{
return (n >> 9);
}
static inline unsigned long to_bytes(sector_t n)
{
return (n << 9);
}
int dm_split_args(int *argc, char ***argvp, char *input);
/*
@ -189,4 +100,13 @@ int dm_lock_for_deletion(struct mapped_device *md);
void dm_kobject_uevent(struct mapped_device *md);
/*
* Dirty log
*/
int dm_dirty_log_init(void);
void dm_dirty_log_exit(void);
int dm_kcopyd_init(void);
void dm_kcopyd_exit(void);
#endif

42
drivers/md/kcopyd.h
View File

@ -1,42 +0,0 @@
/*
* Copyright (C) 2001 Sistina Software
*
* This file is released under the GPL.
*
* Kcopyd provides a simple interface for copying an area of one
* block-device to one or more other block-devices, with an asynchronous
* completion notification.
*/
#ifndef DM_KCOPYD_H
#define DM_KCOPYD_H
#include "dm-io.h"
/* FIXME: make this configurable */
#define KCOPYD_MAX_REGIONS 8
#define KCOPYD_IGNORE_ERROR 1
/*
* To use kcopyd you must first create a kcopyd client object.
*/
struct kcopyd_client;
int kcopyd_client_create(unsigned int num_pages, struct kcopyd_client **result);
void kcopyd_client_destroy(struct kcopyd_client *kc);
/*
* Submit a copy job to kcopyd. This is built on top of the
* previous three fns.
*
* read_err is a boolean,
* write_err is a bitset, with 1 bit for each destination region
*/
typedef void (*kcopyd_notify_fn)(int read_err, unsigned long write_err,
void *context);
int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
unsigned int num_dests, struct io_region *dests,
unsigned int flags, kcopyd_notify_fn fn, void *context);
#endif

96
include/linux/device-mapper.h
View File

@ -1,6 +1,6 @@
/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This file is released under the LGPL.
*/
@ -10,6 +10,8 @@
#ifdef __KERNEL__
#include <linux/bio.h>
struct dm_target;
struct dm_table;
struct dm_dev;
@ -250,11 +252,97 @@ void dm_table_event(struct dm_table *t);
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *t);
/*-----------------------------------------------------------------
* Macros.
*---------------------------------------------------------------*/
#define DM_NAME "device-mapper"
#define DMERR(f, arg...) \
printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMERR_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
f "\n", ## arg); \
} while (0)
#define DMWARN(f, arg...) \
printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMWARN_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
f "\n", ## arg); \
} while (0)
#define DMINFO(f, arg...) \
printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMINFO_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
"\n", ## arg); \
} while (0)
#ifdef CONFIG_DM_DEBUG
# define DMDEBUG(f, arg...) \
printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
# define DMDEBUG_LIMIT(f, arg...) \
do { \
if (printk_ratelimit()) \
printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
"\n", ## arg); \
} while (0)
#else
# define DMDEBUG(f, arg...) do {} while (0)
# define DMDEBUG_LIMIT(f, arg...) do {} while (0)
#endif
#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
0 : scnprintf(result + sz, maxlen - sz, x))
#define SECTOR_SHIFT 9
/*
* Prepare a table for a device that will error all I/O.
* To make it active, call dm_suspend(), dm_swap_table() then dm_resume().
* Definitions of return values from target end_io function.
*/
int dm_create_error_table(struct dm_table **result, struct mapped_device *md);
#define DM_ENDIO_INCOMPLETE 1
#define DM_ENDIO_REQUEUE 2
/*
* Definitions of return values from target map function.
*/
#define DM_MAPIO_SUBMITTED 0
#define DM_MAPIO_REMAPPED 1
#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
/*
* Ceiling(n / sz)
*/
#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
#define dm_sector_div_up(n, sz) ( \
{ \
sector_t _r = ((n) + (sz) - 1); \
sector_div(_r, (sz)); \
_r; \
} \
)
/*
* ceiling(n / size) * size
*/
#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
static inline sector_t to_sector(unsigned long n)
{
return (n >> SECTOR_SHIFT);
}
static inline unsigned long to_bytes(sector_t n)
{
return (n << SECTOR_SHIFT);
}
#endif /* __KERNEL__ */
#endif /* _LINUX_DEVICE_MAPPER_H */

78
drivers/md/dm-log.h → include/linux/dm-dirty-log.h
View File

@ -1,52 +1,56 @@
/*
* Copyright (C) 2003 Sistina Software
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* Device-Mapper dirty region log.
*
* This file is released under the LGPL.
*/
#ifndef DM_DIRTY_LOG
#define DM_DIRTY_LOG
#ifndef _LINUX_DM_DIRTY_LOG
#define _LINUX_DM_DIRTY_LOG
#include "dm.h"
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/device-mapper.h>
typedef sector_t region_t;
struct dirty_log_type;
struct dm_dirty_log_type;
struct dirty_log {
struct dirty_log_type *type;
struct dm_dirty_log {
struct dm_dirty_log_type *type;
void *context;
};
struct dirty_log_type {
struct list_head list;
struct dm_dirty_log_type {
const char *name;
struct module *module;
unsigned int use_count;
int (*ctr)(struct dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv);
void (*dtr)(struct dirty_log *log);
int (*ctr)(struct dm_dirty_log *log, struct dm_target *ti,
unsigned argc, char **argv);
void (*dtr)(struct dm_dirty_log *log);
/*
* There are times when we don't want the log to touch
* the disk.
*/
int (*presuspend)(struct dirty_log *log);
int (*postsuspend)(struct dirty_log *log);
int (*resume)(struct dirty_log *log);
int (*presuspend)(struct dm_dirty_log *log);
int (*postsuspend)(struct dm_dirty_log *log);
int (*resume)(struct dm_dirty_log *log);
/*
* Retrieves the smallest size of region that the log can
* deal with.
*/
uint32_t (*get_region_size)(struct dirty_log *log);
uint32_t (*get_region_size)(struct dm_dirty_log *log);
/*
* A predicate to say whether a region is clean or not.
* May block.
*/
int (*is_clean)(struct dirty_log *log, region_t region);
int (*is_clean)(struct dm_dirty_log *log, region_t region);
/*
* Returns: 0, 1, -EWOULDBLOCK, < 0
@ -59,13 +63,14 @@ struct dirty_log_type {
* passed to a daemon to deal with, since a daemon is
* allowed to block.
*/
int (*in_sync)(struct dirty_log *log, region_t region, int can_block);
int (*in_sync)(struct dm_dirty_log *log, region_t region,
int can_block);
/*
* Flush the current log state (eg, to disk). This
* function may block.
*/
int (*flush)(struct dirty_log *log);
int (*flush)(struct dm_dirty_log *log);
/*
* Mark an area as clean or dirty. These functions may
@ -73,8 +78,8 @@ struct dirty_log_type {
* be extremely rare (eg, allocating another chunk of
* memory for some reason).
*/
void (*mark_region)(struct dirty_log *log, region_t region);
void (*clear_region)(struct dirty_log *log, region_t region);
void (*mark_region)(struct dm_dirty_log *log, region_t region);
void (*clear_region)(struct dm_dirty_log *log, region_t region);
/*
* Returns: <0 (error), 0 (no region), 1 (region)
@ -88,44 +93,39 @@ struct dirty_log_type {
* tells you if an area is synchronised, the other
* assigns recovery work.
*/
int (*get_resync_work)(struct dirty_log *log, region_t *region);
int (*get_resync_work)(struct dm_dirty_log *log, region_t *region);
/*
* This notifies the log that the resync status of a region
* has changed. It also clears the region from the recovering
* list (if present).
*/
void (*set_region_sync)(struct dirty_log *log,
void (*set_region_sync)(struct dm_dirty_log *log,
region_t region, int in_sync);
/*
* Returns the number of regions that are in sync.
*/
region_t (*get_sync_count)(struct dirty_log *log);
region_t (*get_sync_count)(struct dm_dirty_log *log);
/*
* Support function for mirror status requests.
*/
int (*status)(struct dirty_log *log, status_type_t status_type,
char *result, unsigned int maxlen);
int (*status)(struct dm_dirty_log *log, status_type_t status_type,
char *result, unsigned maxlen);
};
int dm_register_dirty_log_type(struct dirty_log_type *type);
int dm_unregister_dirty_log_type(struct dirty_log_type *type);
int dm_dirty_log_type_register(struct dm_dirty_log_type *type);
int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type);
/*
* Make sure you use these two functions, rather than calling
* type->constructor/destructor() directly.
*/
struct dirty_log *dm_create_dirty_log(const char *type_name, struct dm_target *ti,
unsigned int argc, char **argv);
void dm_destroy_dirty_log(struct dirty_log *log);
struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
struct dm_target *ti,
unsigned argc, char **argv);
void dm_dirty_log_destroy(struct dm_dirty_log *log);
/*
* init/exit functions.
*/
int dm_dirty_log_init(void);
void dm_dirty_log_exit(void);
#endif
#endif /* __KERNEL__ */
#endif /* _LINUX_DM_DIRTY_LOG_H */

18
drivers/md/dm-io.h → include/linux/dm-io.h
View File

@ -1,15 +1,20 @@
/*
* Copyright (C) 2003 Sistina Software
* Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
*
* Device-Mapper low-level I/O.
*
* This file is released under the GPL.
*/
#ifndef _DM_IO_H
#define _DM_IO_H
#ifndef _LINUX_DM_IO_H
#define _LINUX_DM_IO_H
#include "dm.h"
#ifdef __KERNEL__
struct io_region {
#include <linux/types.h>
struct dm_io_region {
struct block_device *bdev;
sector_t sector;
sector_t count; /* If this is zero the region is ignored. */
@ -74,6 +79,7 @@ void dm_io_client_destroy(struct dm_io_client *client);
* error occurred doing io to the corresponding region.
*/
int dm_io(struct dm_io_request *io_req, unsigned num_regions,
struct io_region *region, unsigned long *sync_error_bits);
struct dm_io_region *region, unsigned long *sync_error_bits);
#endif
#endif /* __KERNEL__ */
#endif /* _LINUX_DM_IO_H */

47
include/linux/dm-kcopyd.h Normal file
View File

@ -0,0 +1,47 @@
/*
* Copyright (C) 2001 - 2003 Sistina Software
* Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
*
* kcopyd provides a simple interface for copying an area of one
* block-device to one or more other block-devices, either synchronous
* or with an asynchronous completion notification.
*
* This file is released under the GPL.
*/
#ifndef _LINUX_DM_KCOPYD_H
#define _LINUX_DM_KCOPYD_H
#ifdef __KERNEL__
#include <linux/dm-io.h>
/* FIXME: make this configurable */
#define DM_KCOPYD_MAX_REGIONS 8
#define DM_KCOPYD_IGNORE_ERROR 1
/*
* To use kcopyd you must first create a dm_kcopyd_client object.
*/
struct dm_kcopyd_client;
int dm_kcopyd_client_create(unsigned num_pages,
struct dm_kcopyd_client **result);
void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);
/*
* Submit a copy job to kcopyd. This is built on top of the
* previous three fns.
*
* read_err is a boolean,
* write_err is a bitset, with 1 bit for each destination region
*/
typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
void *context);
int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
unsigned num_dests, struct dm_io_region *dests,
unsigned flags, dm_kcopyd_notify_fn fn, void *context);
#endif /* __KERNEL__ */
#endif /* _LINUX_DM_KCOPYD_H */