--- /dev/null
+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 $1 crypt1
+]]
#
dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \
- dm-ioctl.o dm-io.o kcopyd.o
+ dm-ioctl.o dm-io.o dm-kcopyd.o
dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o
dm-snapshot-objs := dm-snap.o dm-exception-store.o
-dm-mirror-objs := dm-log.o dm-raid1.o
+dm-mirror-objs := dm-raid1.o
dm-rdac-objs := dm-mpath-rdac.o
dm-hp-sw-objs := dm-mpath-hp-sw.o
md-mod-objs := md.o bitmap.o
obj-$(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 $@
#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 */
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)
}
struct mdata_req {
- struct io_region *where;
+ struct dm_io_region *where;
struct dm_io_request *io_req;
struct work_struct work;
int result;
*/
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,
* 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;
/* 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;
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;
/*-----------------------------------------------------------------
* 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;
}
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;
}
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;
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;
}
/*
- * 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;
* 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>
#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;
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;
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;
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;
}
}
-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;
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);
* 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;
* 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;
* 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;
/*
#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;
}
* 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;
}
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);
}
/*
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))
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)
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);
}
/*
{
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,
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;
}
* 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);
job->write_err = (unsigned long) -1L;
else
job->read_err = 1;
- push(&_complete_jobs, job);
+ push(&kc->complete_jobs, job);
break;
}
/*
* 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.
* 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);
}
/*
*/
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
* 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;
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;
* after we've completed.
*/
job->fn(read_err, write_err, job->context);
- mempool_free(job, _job_pool);
+ mempool_free(job, job->kc->job_pool);
}
}
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.
return 0;
}
+EXPORT_SYMBOL(dm_kcopyd_copy);
/*
* Cancels a kcopyd job, eg. someone might be deactivating a
#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;
+ int r = -ENOMEM;
+ struct dm_kcopyd_client *kc;
-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);
+ kc = kmalloc(sizeof(*kc), GFP_KERNEL);
+ if (!kc)
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;
+ 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);
- r = kcopyd_init();
- if (r)
- return r;
+ kc->job_pool = mempool_create_slab_pool(MIN_JOBS, _job_cache);
+ if (!kc->job_pool)
+ goto bad_slab;
- kc = kmalloc(sizeof(*kc), GFP_KERNEL);
- if (!kc) {
- kcopyd_exit();
- return -ENOMEM;
- }
+ INIT_WORK(&kc->kcopyd_work, do_work);
+ kc->kcopyd_wq = create_singlethread_workqueue("kcopyd");
+ if (!kc->kcopyd_wq)
+ goto bad_workqueue;
- spin_lock_init(&kc->lock);
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;
+
+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 kcopyd_client_destroy(struct kcopyd_client *kc)
+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);
/*
* Copyright (C) 2003 Sistina Software
+ * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This file is released under the LGPL.
*/
#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"
-static LIST_HEAD(_log_types);
-static DEFINE_SPINLOCK(_lock);
+struct dm_dirty_log_internal {
+ struct dm_dirty_log_type *type;
-int dm_register_dirty_log_type(struct dirty_log_type *type)
-{
- spin_lock(&_lock);
- type->use_count = 0;
- list_add(&type->list, &_log_types);
- spin_unlock(&_lock);
+ struct list_head list;
+ long use;
+};
- return 0;
-}
+static LIST_HEAD(_log_types);
+static DEFINE_SPINLOCK(_lock);
-int dm_unregister_dirty_log_type(struct dirty_log_type *type)
+static struct dm_dirty_log_internal *__find_dirty_log_type(const char *name)
{
- spin_lock(&_lock);
-
- if (type->use_count)
- DMWARN("Attempt to unregister a log type that is still in use");
- else
- list_del(&type->list);
+ struct dm_dirty_log_internal *log_type;
- spin_unlock(&_lock);
+ list_for_each_entry(log_type, &_log_types, list)
+ if (!strcmp(name, log_type->type->name))
+ return log_type;
- return 0;
+ return NULL;
}
-static struct dirty_log_type *_get_type(const char *type_name)
+static struct dm_dirty_log_internal *_get_dirty_log_type(const char *name)
{
- struct dirty_log_type *type;
+ struct dm_dirty_log_internal *log_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 = __find_dirty_log_type(name);
+ if (log_type) {
+ if (!log_type->use && !try_module_get(log_type->type->module))
+ log_type = NULL;
+ else
+ 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'.
*
* 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;
+
+ if (!type_name)
+ return NULL;
- type = _get_type(type_name);
- if (type)
- return type;
+ 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) {
}
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,
- unsigned int argc, char **argv)
+static struct dm_dirty_log_internal *_alloc_dirty_log_type(struct dm_dirty_log_type *type)
{
- struct dirty_log_type *type;
- struct dirty_log *log;
+ 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 dm_dirty_log_type *type;
+ struct dm_dirty_log *log;
log = kmalloc(sizeof(*log), GFP_KERNEL);
if (!log)
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.
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;
};
* The touched member needs to be updated every time we access
* one of the bitsets.
*/
-static inline int log_test_bit(uint32_t *bs, unsigned bit)
+static inline int log_test_bit(uint32_t *bs, unsigned bit)
{
return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0;
}
* 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)
{
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;
}
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;
}
}
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);
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;
*
* 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;
}
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;
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;
/* 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);
/*
/* 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);
}
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;
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;
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;
}
}
-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;
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;
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;
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,
.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,
{
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");
#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>
#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
unsigned region_shift;
/* holds persistent region state */
- struct dirty_log *log;
+ struct dm_dirty_log *log;
/* hash table */
rwlock_t hash_lock;
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 */
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;
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;
}
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);
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(®->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(®->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(®->hash_list);
{
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;
}
/* 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;
}
{
int r;
struct region *reg;
- struct dirty_log *log = ms->rh.log;
+ struct dm_dirty_log *log = ms->rh.log;
/*
* Start quiescing some regions.
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;
/* 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,
{
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;
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,
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);
bio_list_merge(&ms->failures, failures);
spin_unlock_irq(&ms->lock);
- wake(ms);
+ delayed_wake(ms);
}
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);
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);
}
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;
/*
* 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";
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;
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;
}
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)
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;
}
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;
}
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);
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;
{
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);
}
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);
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 */
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))
{
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) {
{
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;
}
r = dm_unregister_target(&mirror_target);
if (r < 0)
DMERR("unregister failed %d", r);
-
- dm_dirty_log_exit();
}
/* Module hooks */
#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"
#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);
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)) {
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;
return 0;
bad6:
- kcopyd_client_destroy(s->kcopyd_client);
+ dm_kcopyd_client_destroy(s->kcopyd_client);
bad5:
s->store.destroy(&s->store);
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);
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)
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;
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);
}
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;
/*
struct dm_snapshot {
struct rw_semaphore lock;
- struct dm_table *table;
+ struct dm_target *ti;
struct dm_dev *origin;
struct dm_dev *cow;
/* 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;
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;
if (!t)
return;
- return suspend_targets(t, 0);
+ suspend_targets(t, 0);
}
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)
dm_target_init,
dm_linear_init,
dm_stripe_init,
+ dm_kcopyd_init,
dm_interface_init,
};
dm_target_exit,
dm_linear_exit,
dm_stripe_exit,
+ dm_kcopyd_exit,
dm_interface_exit,
};
/*
* 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;
return r;
}
-static int next_free_minor(struct mapped_device *md, int *minor)
+static int next_free_minor(int *minor)
{
int r, m;
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);
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) {
/* 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);
#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
*/
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);
/*
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
+++ /dev/null
-/*
- * 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
/*
* 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.
*/
#ifdef __KERNEL__
+#include <linux/bio.h>
+
struct dm_target;
struct dm_table;
struct dm_dev;
*/
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
+
+/*
+ * 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
+
+/*
+ * 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; \
+} \
+)
+
/*
- * 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().
+ * ceiling(n / size) * size
*/
-int dm_create_error_table(struct dm_table **result, struct mapped_device *md);
+#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 */
/*
* 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
+
+#ifdef __KERNEL__
-#include "dm.h"
+#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
* 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
* 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)
* 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);
-
-/*
- * init/exit functions.
- */
-int dm_dirty_log_init(void);
-void dm_dirty_log_exit(void);
+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);
-#endif
+#endif /* __KERNEL__ */
+#endif /* _LINUX_DM_DIRTY_LOG_H */
/*
* 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
+
+#ifdef __KERNEL__
-#include "dm.h"
+#include <linux/types.h>
-struct io_region {
+struct dm_io_region {
struct block_device *bdev;
sector_t sector;
sector_t count; /* If this is zero the region is ignored. */
* 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 */
--- /dev/null
+/*
+ * 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 */
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / commitdiff