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

* master.kernel.org:/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (29 commits)
  dm crypt: tidy pending
  dm mpath: send uevents
  dm: uevent generate events
  dm: add uevent to core
  dm: export name and uuid
  dm raid1: add mirror_set to struct mirror
  dm log: split suspend
  dm mpath: hp retry if not ready
  dm mpath: add hp handler
  dm mpath: add retry pg init
  dm crypt: tidy labels
  dm crypt: tidy whitespace
  dm crypt: add post processing queue
  dm crypt: use per device singlethread workqueues
  dm mpath: emc fix an error message
  dm: bio_list macro renaming
  dm io:ctl remove vmalloc void cast
  dm: tidy bio_io_error usage
  kcopyd use mutex instead of semaphore
  dm: use kzalloc
  ...
This commit is contained in:
Linus Torvalds 2007-10-19 19:17:56 -07:00
parent c1cb8e48bd 80fd662683
commit a5f08c1ce0
27 changed files with 984 additions and 172 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
Documentation/device-mapper/dm-uevent.txt Normal file
View File

@ -0,0 +1,97 @@
The device-mapper uevent code adds the capability to device-mapper to create
and send kobject uevents (uevents). Previously device-mapper events were only
available through the ioctl interface. The advantage of the uevents interface
is the event contains environment attributes providing increased context for
the event avoiding the need to query the state of the device-mapper device after
the event is received.
There are two functions currently for device-mapper events. The first function
listed creates the event and the second function sends the event(s).
void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti,
const char *path, unsigned nr_valid_paths)
void dm_send_uevents(struct list_head *events, struct kobject *kobj)
The variables added to the uevent environment are:
Variable Name: DM_TARGET
Uevent Action(s): KOBJ_CHANGE
Type: string
Description:
Value: Name of device-mapper target that generated the event.
Variable Name: DM_ACTION
Uevent Action(s): KOBJ_CHANGE
Type: string
Description:
Value: Device-mapper specific action that caused the uevent action.
PATH_FAILED - A path has failed.
PATH_REINSTATED - A path has been reinstated.
Variable Name: DM_SEQNUM
Uevent Action(s): KOBJ_CHANGE
Type: unsigned integer
Description: A sequence number for this specific device-mapper device.
Value: Valid unsigned integer range.
Variable Name: DM_PATH
Uevent Action(s): KOBJ_CHANGE
Type: string
Description: Major and minor number of the path device pertaining to this
event.
Value: Path name in the form of "Major:Minor"
Variable Name: DM_NR_VALID_PATHS
Uevent Action(s): KOBJ_CHANGE
Type: unsigned integer
Description:
Value: Valid unsigned integer range.
Variable Name: DM_NAME
Uevent Action(s): KOBJ_CHANGE
Type: string
Description: Name of the device-mapper device.
Value: Name
Variable Name: DM_UUID
Uevent Action(s): KOBJ_CHANGE
Type: string
Description: UUID of the device-mapper device.
Value: UUID. (Empty string if there isn't one.)
An example of the uevents generated as captured by udevmonitor is shown
below.
1.) Path failure.
UEVENT[1192521009.711215] change@/block/dm-3
ACTION=change
DEVPATH=/block/dm-3
SUBSYSTEM=block
DM_TARGET=multipath
DM_ACTION=PATH_FAILED
DM_SEQNUM=1
DM_PATH=8:32
DM_NR_VALID_PATHS=0
DM_NAME=mpath2
DM_UUID=mpath-35333333000002328
MINOR=3
MAJOR=253
SEQNUM=1130
2.) Path reinstate.
UEVENT[1192521132.989927] change@/block/dm-3
ACTION=change
DEVPATH=/block/dm-3
SUBSYSTEM=block
DM_TARGET=multipath
DM_ACTION=PATH_REINSTATED
DM_SEQNUM=2
DM_PATH=8:32
DM_NR_VALID_PATHS=1
DM_NAME=mpath2
DM_UUID=mpath-35333333000002328
MINOR=3
MAJOR=253
SEQNUM=1131

12
drivers/md/Kconfig
View File

@ -267,6 +267,12 @@ config DM_MULTIPATH_RDAC
---help---
Multipath support for LSI/Engenio RDAC.
config DM_MULTIPATH_HP
tristate "HP MSA multipath support (EXPERIMENTAL)"
depends on DM_MULTIPATH && BLK_DEV_DM && EXPERIMENTAL
---help---
Multipath support for HP MSA (Active/Passive) series hardware.
config DM_DELAY
tristate "I/O delaying target (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
@ -276,4 +282,10 @@ config DM_DELAY
If unsure, say N.
config DM_UEVENT
bool "DM uevents (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
---help---
Generate udev events for DM events.
endif # MD

6
drivers/md/Makefile
View File

@ -8,6 +8,7 @@ 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-rdac-objs := dm-mpath-rdac.o
dm-hp-sw-objs := dm-mpath-hp-sw.o
md-mod-objs := md.o bitmap.o
raid456-objs := raid5.o raid6algos.o raid6recov.o raid6tables.o \
raid6int1.o raid6int2.o raid6int4.o \
@ -35,6 +36,7 @@ obj-$(CONFIG_DM_CRYPT) += dm-crypt.o
obj-$(CONFIG_DM_DELAY) += dm-delay.o
obj-$(CONFIG_DM_MULTIPATH) += dm-multipath.o dm-round-robin.o
obj-$(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
@ -48,6 +50,10 @@ ifeq ($(CONFIG_ALTIVEC),y)
altivec_flags := -maltivec -mabi=altivec
endif
ifeq ($(CONFIG_DM_UEVENT),y)
dm-mod-objs += dm-uevent.o
endif
targets += raid6int1.c
$(obj)/raid6int1.c: UNROLL := 1
$(obj)/raid6int1.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE

5
drivers/md/dm-bio-list.h
View File

@ -21,11 +21,6 @@ static inline int bio_list_empty(const struct bio_list *bl)
return bl->head == NULL;
}
#define BIO_LIST_INIT { .head = NULL, .tail = NULL }
#define BIO_LIST(bl) \
struct bio_list bl = BIO_LIST_INIT
static inline void bio_list_init(struct bio_list *bl)
{
bl->head = bl->tail = NULL;

170
drivers/md/dm-crypt.c
View File

@ -36,7 +36,6 @@ struct dm_crypt_io {
struct work_struct work;
atomic_t pending;
int error;
int post_process;
};
/*
@ -57,7 +56,7 @@ struct crypt_config;
struct crypt_iv_operations {
int (*ctr)(struct crypt_config *cc, struct dm_target *ti,
const char *opts);
const char *opts);
void (*dtr)(struct crypt_config *cc);
const char *(*status)(struct crypt_config *cc);
int (*generator)(struct crypt_config *cc, u8 *iv, sector_t sector);
@ -80,6 +79,8 @@ struct crypt_config {
mempool_t *page_pool;
struct bio_set *bs;
struct workqueue_struct *io_queue;
struct workqueue_struct *crypt_queue;
/*
* crypto related data
*/
@ -137,7 +138,7 @@ static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
}
static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
const char *opts)
const char *opts)
{
struct crypto_cipher *essiv_tfm;
struct crypto_hash *hash_tfm;
@ -175,6 +176,7 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
if (err) {
ti->error = "Error calculating hash in ESSIV";
kfree(salt);
return err;
}
@ -188,7 +190,7 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
if (crypto_cipher_blocksize(essiv_tfm) !=
crypto_blkcipher_ivsize(cc->tfm)) {
ti->error = "Block size of ESSIV cipher does "
"not match IV size of block cipher";
"not match IV size of block cipher";
crypto_free_cipher(essiv_tfm);
kfree(salt);
return -EINVAL;
@ -319,10 +321,10 @@ crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
return r;
}
static void
crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx,
struct bio *bio_out, struct bio *bio_in,
sector_t sector, int write)
static void crypt_convert_init(struct crypt_config *cc,
struct convert_context *ctx,
struct bio *bio_out, struct bio *bio_in,
sector_t sector, int write)
{
ctx->bio_in = bio_in;
ctx->bio_out = bio_out;
@ -338,7 +340,7 @@ crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx,
* Encrypt / decrypt data from one bio to another one (can be the same one)
*/
static int crypt_convert(struct crypt_config *cc,
struct convert_context *ctx)
struct convert_context *ctx)
{
int r = 0;
@ -370,7 +372,7 @@ static int crypt_convert(struct crypt_config *cc,
}
r = crypt_convert_scatterlist(cc, &sg_out, &sg_in, sg_in.length,
ctx->write, ctx->sector);
ctx->write, ctx->sector);
if (r < 0)
break;
@ -380,13 +382,13 @@ static int crypt_convert(struct crypt_config *cc,
return r;
}
static void dm_crypt_bio_destructor(struct bio *bio)
{
static void dm_crypt_bio_destructor(struct bio *bio)
{
struct dm_crypt_io *io = bio->bi_private;
struct crypt_config *cc = io->target->private;
bio_free(bio, cc->bs);
}
}
/*
* Generate a new unfragmented bio with the given size
@ -458,7 +460,7 @@ static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
* One of the bios was finished. Check for completion of
* the whole request and correctly clean up the buffer.
*/
static void dec_pending(struct dm_crypt_io *io, int error)
static void crypt_dec_pending(struct dm_crypt_io *io, int error)
{
struct crypt_config *cc = (struct crypt_config *) io->target->private;
@ -474,18 +476,36 @@ static void dec_pending(struct dm_crypt_io *io, int error)
}
/*
* kcryptd:
* kcryptd/kcryptd_io:
*
* Needed because it would be very unwise to do decryption in an
* interrupt context.
*
* kcryptd performs the actual encryption or decryption.
*
* kcryptd_io performs the IO submission.
*
* They must be separated as otherwise the final stages could be
* starved by new requests which can block in the first stages due
* to memory allocation.
*/
static struct workqueue_struct *_kcryptd_workqueue;
static void kcryptd_do_work(struct work_struct *work);
static void kcryptd_do_crypt(struct work_struct *work);
static void kcryptd_queue_io(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
INIT_WORK(&io->work, kcryptd_do_work);
queue_work(_kcryptd_workqueue, &io->work);
queue_work(cc->io_queue, &io->work);
}
static void kcryptd_queue_crypt(struct dm_crypt_io *io)
{
struct crypt_config *cc = io->target->private;
INIT_WORK(&io->work, kcryptd_do_crypt);
queue_work(cc->crypt_queue, &io->work);
}
static void crypt_endio(struct bio *clone, int error)
@ -508,13 +528,12 @@ static void crypt_endio(struct bio *clone, int error)
}
bio_put(clone);
io->post_process = 1;
kcryptd_queue_io(io);
kcryptd_queue_crypt(io);
return;
out:
bio_put(clone);
dec_pending(io, error);
crypt_dec_pending(io, error);
}
static void clone_init(struct dm_crypt_io *io, struct bio *clone)
@ -544,7 +563,7 @@ static void process_read(struct dm_crypt_io *io)
*/
clone = bio_alloc_bioset(GFP_NOIO, bio_segments(base_bio), cc->bs);
if (unlikely(!clone)) {
dec_pending(io, -ENOMEM);
crypt_dec_pending(io, -ENOMEM);
return;
}
@ -579,7 +598,7 @@ static void process_write(struct dm_crypt_io *io)
while (remaining) {
clone = crypt_alloc_buffer(io, remaining);
if (unlikely(!clone)) {
dec_pending(io, -ENOMEM);
crypt_dec_pending(io, -ENOMEM);
return;
}
@ -589,7 +608,7 @@ static void process_write(struct dm_crypt_io *io)
if (unlikely(crypt_convert(cc, &ctx) < 0)) {
crypt_free_buffer_pages(cc, clone);
bio_put(clone);
dec_pending(io, -EIO);
crypt_dec_pending(io, -EIO);
return;
}
@ -624,17 +643,23 @@ static void process_read_endio(struct dm_crypt_io *io)
crypt_convert_init(cc, &ctx, io->base_bio, io->base_bio,
io->base_bio->bi_sector - io->target->begin, 0);
dec_pending(io, crypt_convert(cc, &ctx));
crypt_dec_pending(io, crypt_convert(cc, &ctx));
}
static void kcryptd_do_work(struct work_struct *work)
{
struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
if (io->post_process)
process_read_endio(io);
else if (bio_data_dir(io->base_bio) == READ)
if (bio_data_dir(io->base_bio) == READ)
process_read(io);
}
static void kcryptd_do_crypt(struct work_struct *work)
{
struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work);
if (bio_data_dir(io->base_bio) == READ)
process_read_endio(io);
else
process_write(io);
}
@ -690,7 +715,7 @@ static int crypt_set_key(struct crypt_config *cc, char *key)
cc->key_size = key_size; /* initial settings */
if ((!key_size && strcmp(key, "-")) ||
(key_size && crypt_decode_key(cc->key, key, key_size) < 0))
(key_size && crypt_decode_key(cc->key, key, key_size) < 0))
return -EINVAL;
set_bit(DM_CRYPT_KEY_VALID, &cc->flags);
@ -746,7 +771,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (crypt_set_key(cc, argv[1])) {
ti->error = "Error decoding key";
goto bad1;
goto bad_cipher;
}
/* Compatiblity mode for old dm-crypt cipher strings */
@ -757,19 +782,19 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (strcmp(chainmode, "ecb") && !ivmode) {
ti->error = "This chaining mode requires an IV mechanism";
goto bad1;
goto bad_cipher;
}
if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode,
cipher) >= CRYPTO_MAX_ALG_NAME) {
if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)",
chainmode, cipher) >= CRYPTO_MAX_ALG_NAME) {
ti->error = "Chain mode + cipher name is too long";
goto bad1;
goto bad_cipher;
}
tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm)) {
ti->error = "Error allocating crypto tfm";
goto bad1;
goto bad_cipher;
}
strcpy(cc->cipher, cipher);
@ -793,18 +818,18 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
cc->iv_gen_ops = &crypt_iv_null_ops;
else {
ti->error = "Invalid IV mode";
goto bad2;
goto bad_ivmode;
}
if (cc->iv_gen_ops && cc->iv_gen_ops->ctr &&
cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
goto bad2;
goto bad_ivmode;
cc->iv_size = crypto_blkcipher_ivsize(tfm);
if (cc->iv_size)
/* at least a 64 bit sector number should fit in our buffer */
cc->iv_size = max(cc->iv_size,
(unsigned int)(sizeof(u64) / sizeof(u8)));
(unsigned int)(sizeof(u64) / sizeof(u8)));
else {
if (cc->iv_gen_ops) {
DMWARN("Selected cipher does not support IVs");
@ -817,13 +842,13 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
cc->io_pool = mempool_create_slab_pool(MIN_IOS, _crypt_io_pool);
if (!cc->io_pool) {
ti->error = "Cannot allocate crypt io mempool";
goto bad3;
goto bad_slab_pool;
}
cc->page_pool = mempool_create_page_pool(MIN_POOL_PAGES, 0);
if (!cc->page_pool) {
ti->error = "Cannot allocate page mempool";
goto bad4;
goto bad_page_pool;
}
cc->bs = bioset_create(MIN_IOS, MIN_IOS);
@ -834,25 +859,25 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) {
ti->error = "Error setting key";
goto bad5;
goto bad_device;
}
if (sscanf(argv[2], "%llu", &tmpll) != 1) {
ti->error = "Invalid iv_offset sector";
goto bad5;
goto bad_device;
}
cc->iv_offset = tmpll;
if (sscanf(argv[4], "%llu", &tmpll) != 1) {
ti->error = "Invalid device sector";
goto bad5;
goto bad_device;
}
cc->start = tmpll;
if (dm_get_device(ti, argv[3], cc->start, ti->len,
dm_table_get_mode(ti->table), &cc->dev)) {
dm_table_get_mode(ti->table), &cc->dev)) {
ti->error = "Device lookup failed";
goto bad5;
goto bad_device;
}
if (ivmode && cc->iv_gen_ops) {
@ -861,27 +886,45 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
cc->iv_mode = kmalloc(strlen(ivmode) + 1, GFP_KERNEL);
if (!cc->iv_mode) {
ti->error = "Error kmallocing iv_mode string";
goto bad5;
goto bad_ivmode_string;
}
strcpy(cc->iv_mode, ivmode);
} else
cc->iv_mode = NULL;
cc->io_queue = create_singlethread_workqueue("kcryptd_io");
if (!cc->io_queue) {
ti->error = "Couldn't create kcryptd io queue";
goto bad_io_queue;
}
cc->crypt_queue = create_singlethread_workqueue("kcryptd");
if (!cc->crypt_queue) {
ti->error = "Couldn't create kcryptd queue";
goto bad_crypt_queue;
}
ti->private = cc;
return 0;
bad5:
bad_crypt_queue:
destroy_workqueue(cc->io_queue);
bad_io_queue:
kfree(cc->iv_mode);
bad_ivmode_string:
dm_put_device(ti, cc->dev);
bad_device:
bioset_free(cc->bs);
bad_bs:
mempool_destroy(cc->page_pool);
bad4:
bad_page_pool:
mempool_destroy(cc->io_pool);
bad3:
bad_slab_pool:
if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
cc->iv_gen_ops->dtr(cc);
bad2:
bad_ivmode:
crypto_free_blkcipher(tfm);
bad1:
bad_cipher:
/* Must zero key material before freeing */
memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
kfree(cc);
@ -892,7 +935,8 @@ static void crypt_dtr(struct dm_target *ti)
{
struct crypt_config *cc = (struct crypt_config *) ti->private;
flush_workqueue(_kcryptd_workqueue);
destroy_workqueue(cc->io_queue);
destroy_workqueue(cc->crypt_queue);
bioset_free(cc->bs);
mempool_destroy(cc->page_pool);
@ -918,9 +962,13 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
io = mempool_alloc(cc->io_pool, GFP_NOIO);
io->target = ti;
io->base_bio = bio;
io->error = io->post_process = 0;
io->error = 0;
atomic_set(&io->pending, 0);
kcryptd_queue_io(io);
if (bio_data_dir(io->base_bio) == READ)
kcryptd_queue_io(io);
else
kcryptd_queue_crypt(io);
return DM_MAPIO_SUBMITTED;
}
@ -1037,25 +1085,12 @@ static int __init dm_crypt_init(void)
if (!_crypt_io_pool)
return -ENOMEM;
_kcryptd_workqueue = create_workqueue("kcryptd");
if (!_kcryptd_workqueue) {
r = -ENOMEM;
DMERR("couldn't create kcryptd");
goto bad1;
}
r = dm_register_target(&crypt_target);
if (r < 0) {
DMERR("register failed %d", r);
goto bad2;
kmem_cache_destroy(_crypt_io_pool);
}
return 0;
bad2:
destroy_workqueue(_kcryptd_workqueue);
bad1:
kmem_cache_destroy(_crypt_io_pool);
return r;
}
@ -1066,7 +1101,6 @@ static void __exit dm_crypt_exit(void)
if (r < 0)
DMERR("unregister failed %d", r);
destroy_workqueue(_kcryptd_workqueue);
kmem_cache_destroy(_crypt_io_pool);
}

23
drivers/md/dm-delay.c
View File

@ -83,7 +83,7 @@ static struct bio *flush_delayed_bios(struct delay_c *dc, int flush_all)
struct dm_delay_info *delayed, *next;
unsigned long next_expires = 0;
int start_timer = 0;
BIO_LIST(flush_bios);
struct bio_list flush_bios = { };
mutex_lock(&delayed_bios_lock);
list_for_each_entry_safe(delayed, next, &dc->delayed_bios, list) {
@ -163,34 +163,32 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad;
}
if (argc == 3) {
dc->dev_write = NULL;
dc->dev_write = NULL;
if (argc == 3)
goto out;
}
if (sscanf(argv[4], "%llu", &tmpll) != 1) {
ti->error = "Invalid write device sector";
goto bad;
goto bad_dev_read;
}
dc->start_write = tmpll;
if (sscanf(argv[5], "%u", &dc->write_delay) != 1) {
ti->error = "Invalid write delay";
goto bad;
goto bad_dev_read;
}
if (dm_get_device(ti, argv[3], dc->start_write, ti->len,
dm_table_get_mode(ti->table), &dc->dev_write)) {
ti->error = "Write device lookup failed";
dm_put_device(ti, dc->dev_read);
goto bad;
goto bad_dev_read;
}
out:
dc->delayed_pool = mempool_create_slab_pool(128, delayed_cache);
if (!dc->delayed_pool) {
DMERR("Couldn't create delayed bio pool.");
goto bad;
goto bad_dev_write;
}
setup_timer(&dc->delay_timer, handle_delayed_timer, (unsigned long)dc);
@ -203,6 +201,11 @@ out:
ti->private = dc;
return 0;
bad_dev_write:
if (dc->dev_write)
dm_put_device(ti, dc->dev_write);
bad_dev_read:
dm_put_device(ti, dc->dev_read);
bad:
kfree(dc);
return -EINVAL;
@ -305,7 +308,7 @@ static int delay_status(struct dm_target *ti, status_type_t type,
(unsigned long long) dc->start_read,
dc->read_delay);
if (dc->dev_write)
DMEMIT("%s %llu %u", dc->dev_write->name,
DMEMIT(" %s %llu %u", dc->dev_write->name,
(unsigned long long) dc->start_write,
dc->write_delay);
break;

8
drivers/md/dm-emc.c
View File

@ -81,7 +81,7 @@ static struct bio *get_failover_bio(struct dm_path *path, unsigned data_size)
}
if (bio_add_page(bio, page, data_size, 0) != data_size) {
DMERR("get_failover_bio: alloc_page() failed.");
DMERR("get_failover_bio: bio_add_page() failed.");
__free_page(page);
bio_put(bio);
return NULL;
@ -211,12 +211,10 @@ fail_path:
static struct emc_handler *alloc_emc_handler(void)
{
struct emc_handler *h = kmalloc(sizeof(*h), GFP_KERNEL);
struct emc_handler *h = kzalloc(sizeof(*h), GFP_KERNEL);
if (h) {
memset(h, 0, sizeof(*h));
if (h)
spin_lock_init(&h->lock);
}
return h;
}

6
drivers/md/dm-hw-handler.c
View File

@ -91,12 +91,10 @@ void dm_put_hw_handler(struct hw_handler_type *hwht)
static struct hwh_internal *_alloc_hw_handler(struct hw_handler_type *hwht)
{
struct hwh_internal *hwhi = kmalloc(sizeof(*hwhi), GFP_KERNEL);
struct hwh_internal *hwhi = kzalloc(sizeof(*hwhi), GFP_KERNEL);
if (hwhi) {
memset(hwhi, 0, sizeof(*hwhi));
if (hwhi)
hwhi->hwht = *hwht;
}
return hwhi;
}

1
drivers/md/dm-hw-handler.h
View File

@ -58,5 +58,6 @@ unsigned dm_scsi_err_handler(struct hw_handler *hwh, struct bio *bio);
#define MP_FAIL_PATH 1
#define MP_BYPASS_PG 2
#define MP_ERROR_IO 4 /* Don't retry this I/O */
#define MP_RETRY 8
#endif

40
drivers/md/dm-ioctl.c
View File

@ -700,7 +700,7 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
int r;
char *new_name = (char *) param + param->data_start;
if (new_name < (char *) (param + 1) ||
if (new_name < (char *) param->data ||
invalid_str(new_name, (void *) param + param_size)) {
DMWARN("Invalid new logical volume name supplied.");
return -EINVAL;
@ -726,7 +726,7 @@ static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
if (!md)
return -ENXIO;
if (geostr < (char *) (param + 1) ||
if (geostr < (char *) param->data ||
invalid_str(geostr, (void *) param + param_size)) {
DMWARN("Invalid geometry supplied.");
goto out;
@ -1233,7 +1233,7 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
if (r)
goto out;
if (tmsg < (struct dm_target_msg *) (param + 1) ||
if (tmsg < (struct dm_target_msg *) param->data ||
invalid_str(tmsg->message, (void *) param + param_size)) {
DMWARN("Invalid target message parameters.");
r = -EINVAL;
@ -1358,7 +1358,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param)
if (tmp.data_size < sizeof(tmp))
return -EINVAL;
dmi = (struct dm_ioctl *) vmalloc(tmp.data_size);
dmi = vmalloc(tmp.data_size);
if (!dmi)
return -ENOMEM;
@ -1515,3 +1515,35 @@ void dm_interface_exit(void)
dm_hash_exit();
}
/**
* dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers
* @md: Pointer to mapped_device
* @name: Buffer (size DM_NAME_LEN) for name
* @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined
*/
int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid)
{
int r = 0;
struct hash_cell *hc;
if (!md)
return -ENXIO;
dm_get(md);
down_read(&_hash_lock);
hc = dm_get_mdptr(md);
if (!hc || hc->md != md) {
r = -ENXIO;
goto out;
}
strcpy(name, hc->name);
strcpy(uuid, hc->uuid ? : "");
out:
up_read(&_hash_lock);
dm_put(md);
return r;
}

2
drivers/md/dm-log.c
View File

@ -696,7 +696,7 @@ static struct dirty_log_type _disk_type = {
.module = THIS_MODULE,
.ctr = disk_ctr,
.dtr = disk_dtr,
.suspend = disk_flush,
.postsuspend = disk_flush,
.resume = disk_resume,
.get_region_size = core_get_region_size,
.is_clean = core_is_clean,

3
drivers/md/dm-log.h
View File

@ -32,7 +32,8 @@ struct dirty_log_type {
* There are times when we don't want the log to touch
* the disk.
*/
int (*suspend)(struct dirty_log *log);
int (*presuspend)(struct dirty_log *log);
int (*postsuspend)(struct dirty_log *log);
int (*resume)(struct dirty_log *log);
/*

248
drivers/md/dm-mpath-hp-sw.c Normal file
View File

@ -0,0 +1,248 @@
/*
* Copyright (C) 2005 Mike Christie, All rights reserved.
* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
* Authors: Mike Christie
* Dave Wysochanski
*
* This file is released under the GPL.
*
* This module implements the specific path activation code for
* HP StorageWorks and FSC FibreCat Asymmetric (Active/Passive)
* storage arrays.
* These storage arrays have controller-based failover, not
* LUN-based failover. However, LUN-based failover is the design
* of dm-multipath. Thus, this module is written for LUN-based failover.
*/
#include <linux/blkdev.h>
#include <linux/list.h>
#include <linux/types.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include "dm.h"
#include "dm-hw-handler.h"
#define DM_MSG_PREFIX "multipath hp-sw"
#define DM_HP_HWH_NAME "hp-sw"
#define DM_HP_HWH_VER "1.0.0"
struct hp_sw_context {
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
};
/*
* hp_sw_error_is_retryable - Is an HP-specific check condition retryable?
* @req: path activation request
*
* Examine error codes of request and determine whether the error is retryable.
* Some error codes are already retried by scsi-ml (see
* scsi_decide_disposition), but some HP specific codes are not.
* The intent of this routine is to supply the logic for the HP specific
* check conditions.
*
* Returns:
* 1 - command completed with retryable error
* 0 - command completed with non-retryable error
*
* Possible optimizations
* 1. More hardware-specific error codes
*/
static int hp_sw_error_is_retryable(struct request *req)
{
/*
* NOT_READY is known to be retryable
* For now we just dump out the sense data and call it retryable
*/
if (status_byte(req->errors) == CHECK_CONDITION)
__scsi_print_sense(DM_HP_HWH_NAME, req->sense, req->sense_len);
/*
* At this point we don't have complete information about all the error
* codes from this hardware, so we are just conservative and retry
* when in doubt.
*/
return 1;
}
/*
* hp_sw_end_io - Completion handler for HP path activation.
* @req: path activation request
* @error: scsi-ml error
*
* Check sense data, free request structure, and notify dm that
* pg initialization has completed.
*
* Context: scsi-ml softirq
*
*/
static void hp_sw_end_io(struct request *req, int error)
{
struct dm_path *path = req->end_io_data;
unsigned err_flags = 0;
if (!error) {
DMDEBUG("%s path activation command - success",
path->dev->name);
goto out;
}
if (hp_sw_error_is_retryable(req)) {
DMDEBUG("%s path activation command - retry",
path->dev->name);
err_flags = MP_RETRY;
goto out;
}
DMWARN("%s path activation fail - error=0x%x",
path->dev->name, error);
err_flags = MP_FAIL_PATH;
out:
req->end_io_data = NULL;
__blk_put_request(req->q, req);
dm_pg_init_complete(path, err_flags);
}
/*
* hp_sw_get_request - Allocate an HP specific path activation request
* @path: path on which request will be sent (needed for request queue)
*
* The START command is used for path activation request.
* These arrays are controller-based failover, not LUN based.
* One START command issued to a single path will fail over all
* LUNs for the same controller.
*
* Possible optimizations
* 1. Make timeout configurable
* 2. Preallocate request
*/
static struct request *hp_sw_get_request(struct dm_path *path)
{
struct request *req;
struct block_device *bdev = path->dev->bdev;
struct request_queue *q = bdev_get_queue(bdev);
struct hp_sw_context *h = path->hwhcontext;
req = blk_get_request(q, WRITE, GFP_NOIO);
if (!req)
goto out;
req->timeout = 60 * HZ;
req->errors = 0;
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
req->end_io_data = path;
req->sense = h->sense;
memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE);
memset(&req->cmd, 0, BLK_MAX_CDB);
req->cmd[0] = START_STOP;
req->cmd[4] = 1;
req->cmd_len = COMMAND_SIZE(req->cmd[0]);
out:
return req;
}
/*
* hp_sw_pg_init - HP path activation implementation.
* @hwh: hardware handler specific data
* @bypassed: unused; is the path group bypassed? (see dm-mpath.c)
* @path: path to send initialization command
*
* Send an HP-specific path activation command on 'path'.
* Do not try to optimize in any way, just send the activation command.
* More than one path activation command may be sent to the same controller.
* This seems to work fine for basic failover support.
*
* Possible optimizations
* 1. Detect an in-progress activation request and avoid submitting another one
* 2. Model the controller and only send a single activation request at a time
* 3. Determine the state of a path before sending an activation request
*
* Context: kmpathd (see process_queued_ios() in dm-mpath.c)
*/
static void hp_sw_pg_init(struct hw_handler *hwh, unsigned bypassed,
struct dm_path *path)
{
struct request *req;
struct hp_sw_context *h;
path->hwhcontext = hwh->context;
h = hwh->context;
req = hp_sw_get_request(path);
if (!req) {
DMERR("%s path activation command - allocation fail",
path->dev->name);
goto retry;
}
DMDEBUG("%s path activation command - sent", path->dev->name);
blk_execute_rq_nowait(req->q, NULL, req, 1, hp_sw_end_io);
return;
retry:
dm_pg_init_complete(path, MP_RETRY);
}
static int hp_sw_create(struct hw_handler *hwh, unsigned argc, char **argv)
{
struct hp_sw_context *h;
h = kmalloc(sizeof(*h), GFP_KERNEL);
if (!h)
return -ENOMEM;
hwh->context = h;
return 0;
}
static void hp_sw_destroy(struct hw_handler *hwh)
{
struct hp_sw_context *h = hwh->context;
kfree(h);
}
static struct hw_handler_type hp_sw_hwh = {
.name = DM_HP_HWH_NAME,
.module = THIS_MODULE,
.create = hp_sw_create,
.destroy = hp_sw_destroy,
.pg_init = hp_sw_pg_init,
};
static int __init hp_sw_init(void)
{
int r;
r = dm_register_hw_handler(&hp_sw_hwh);
if (r < 0)
DMERR("register failed %d", r);
else
DMINFO("version " DM_HP_HWH_VER " loaded");
return r;
}
static void __exit hp_sw_exit(void)
{
int r;
r = dm_unregister_hw_handler(&hp_sw_hwh);
if (r < 0)
DMERR("unregister failed %d", r);
}
module_init(hp_sw_init);
module_exit(hp_sw_exit);
MODULE_DESCRIPTION("DM Multipath HP StorageWorks / FSC FibreCat (A/P) support");
MODULE_AUTHOR("Mike Christie, Dave Wysochanski <dm-devel@redhat.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION(DM_HP_HWH_VER);

15
drivers/md/dm-mpath-rdac.c
View File

@ -664,20 +664,21 @@ static struct hw_handler_type rdac_handler = {
static int __init rdac_init(void)
{
int r = dm_register_hw_handler(&rdac_handler);
if (r < 0) {
DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
return r;
}
int r;
rdac_wkqd = create_singlethread_workqueue("rdac_wkqd");
if (!rdac_wkqd) {
DMERR("Failed to create workqueue rdac_wkqd.");
dm_unregister_hw_handler(&rdac_handler);
return -ENOMEM;
}
r = dm_register_hw_handler(&rdac_handler);
if (r < 0) {
DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
destroy_workqueue(rdac_wkqd);
return r;
}
DMINFO("%s: version %s loaded", RDAC_DM_HWH_NAME, RDAC_DM_HWH_VER);
return 0;
}

88
drivers/md/dm-mpath.c
View File

@ -10,6 +10,7 @@
#include "dm-hw-handler.h"
#include "dm-bio-list.h"
#include "dm-bio-record.h"
#include "dm-uevent.h"
#include <linux/ctype.h>
#include <linux/init.h>
@ -75,6 +76,8 @@ struct multipath {
unsigned queue_io; /* Must we queue all I/O? */
unsigned queue_if_no_path; /* Queue I/O if last path fails? */
unsigned saved_queue_if_no_path;/* Saved state during suspension */
unsigned pg_init_retries; /* Number of times to retry pg_init */
unsigned pg_init_count; /* Number of times pg_init called */
struct work_struct process_queued_ios;
struct bio_list queued_ios;
@ -225,6 +228,8 @@ static void __switch_pg(struct multipath *m, struct pgpath *pgpath)
m->pg_init_required = 0;
m->queue_io = 0;
}
m->pg_init_count = 0;
}
static int __choose_path_in_pg(struct multipath *m, struct priority_group *pg)
@ -424,6 +429,7 @@ static void process_queued_ios(struct work_struct *work)
must_queue = 0;
if (m->pg_init_required && !m->pg_init_in_progress) {
m->pg_init_count++;
m->pg_init_required = 0;
m->pg_init_in_progress = 1;
init_required = 1;
@ -689,9 +695,11 @@ static int parse_features(struct arg_set *as, struct multipath *m)
int r;
unsigned argc;
struct dm_target *ti = m->ti;
const char *param_name;
static struct param _params[] = {
{0, 1, "invalid number of feature args"},
{0, 3, "invalid number of feature args"},
{1, 50, "pg_init_retries must be between 1 and 50"},
};
r = read_param(_params, shift(as), &argc, &ti->error);
@ -701,12 +709,28 @@ static int parse_features(struct arg_set *as, struct multipath *m)
if (!argc)
return 0;
if (!strnicmp(shift(as), MESG_STR("queue_if_no_path")))
return queue_if_no_path(m, 1, 0);
else {
do {
param_name = shift(as);
argc--;
if (!strnicmp(param_name, MESG_STR("queue_if_no_path"))) {
r = queue_if_no_path(m, 1, 0);
continue;
}
if (!strnicmp(param_name, MESG_STR("pg_init_retries")) &&
(argc >= 1)) {
r = read_param(_params + 1, shift(as),
&m->pg_init_retries, &ti->error);
argc--;
continue;
}
ti->error = "Unrecognised multipath feature request";
return -EINVAL;
}
r = -EINVAL;
} while (argc && !r);
return r;
}
static int multipath_ctr(struct dm_target *ti, unsigned int argc,
@ -834,6 +858,9 @@ static int fail_path(struct pgpath *pgpath)
if (pgpath == m->current_pgpath)
m->current_pgpath = NULL;
dm_path_uevent(DM_UEVENT_PATH_FAILED, m->ti,
pgpath->path.dev->name, m->nr_valid_paths);
queue_work(kmultipathd, &m->trigger_event);
out:
@ -873,6 +900,9 @@ static int reinstate_path(struct pgpath *pgpath)
if (!m->nr_valid_paths++ && m->queue_size)
queue_work(kmultipathd, &m->process_queued_ios);
dm_path_uevent(DM_UEVENT_PATH_REINSTATED, m->ti,
pgpath->path.dev->name, m->nr_valid_paths);
queue_work(kmultipathd, &m->trigger_event);
out:
@ -975,6 +1005,26 @@ static int bypass_pg_num(struct multipath *m, const char *pgstr, int bypassed)
return 0;
}
/*
* Should we retry pg_init immediately?
*/
static int pg_init_limit_reached(struct multipath *m, struct pgpath *pgpath)
{
unsigned long flags;
int limit_reached = 0;
spin_lock_irqsave(&m->lock, flags);
if (m->pg_init_count <= m->pg_init_retries)
m->pg_init_required = 1;
else
limit_reached = 1;
spin_unlock_irqrestore(&m->lock, flags);
return limit_reached;
}
/*
* pg_init must call this when it has completed its initialisation
*/
@ -985,8 +1035,14 @@ void dm_pg_init_complete(struct dm_path *path, unsigned err_flags)
struct multipath *m = pg->m;
unsigned long flags;
/* We insist on failing the path if the PG is already bypassed. */
if (err_flags && pg->bypassed)
/*
* If requested, retry pg_init until maximum number of retries exceeded.
* If retry not requested and PG already bypassed, always fail the path.
*/
if (err_flags & MP_RETRY) {
if (pg_init_limit_reached(m, pgpath))
err_flags |= MP_FAIL_PATH;
} else if (err_flags && pg->bypassed)
err_flags |= MP_FAIL_PATH;
if (err_flags & MP_FAIL_PATH)
@ -996,7 +1052,7 @@ void dm_pg_init_complete(struct dm_path *path, unsigned err_flags)
bypass_pg(m, pg, 1);
spin_lock_irqsave(&m->lock, flags);
if (err_flags) {
if (err_flags & ~MP_RETRY) {
m->current_pgpath = NULL;
m->current_pg = NULL;
} else if (!m->pg_init_required)
@ -1148,11 +1204,15 @@ static int multipath_status(struct dm_target *ti, status_type_t type,
/* Features */
if (type == STATUSTYPE_INFO)
DMEMIT("1 %u ", m->queue_size);
else if (m->queue_if_no_path)
DMEMIT("1 queue_if_no_path ");
else
DMEMIT("0 ");
DMEMIT("2 %u %u ", m->queue_size, m->pg_init_count);
else {
DMEMIT("%u ", m->queue_if_no_path +
(m->pg_init_retries > 0) * 2);
if (m->queue_if_no_path)
DMEMIT("queue_if_no_path ");
if (m->pg_init_retries)
DMEMIT("pg_init_retries %u ", m->pg_init_retries);
}
if (hwh->type && hwh->type->status)
sz += hwh->type->status(hwh, type, result + sz, maxlen - sz);

6
drivers/md/dm-path-selector.c
View File

@ -94,12 +94,10 @@ out:
static struct ps_internal *_alloc_path_selector(struct path_selector_type *pst)
{
struct ps_internal *psi = kmalloc(sizeof(*psi), GFP_KERNEL);
struct ps_internal *psi = kzalloc(sizeof(*psi), GFP_KERNEL);
if (psi) {
memset(psi, 0, sizeof(*psi));
if (psi)
psi->pst = *pst;
}
return psi;
}

35
drivers/md/dm-raid1.c
View File

@ -19,6 +19,7 @@
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/workqueue.h>
#include <linux/log2.h>
#define DM_MSG_PREFIX "raid1"
#define DM_IO_PAGES 64
@ -113,6 +114,7 @@ struct region {
* Mirror set structures.
*---------------------------------------------------------------*/
struct mirror {
struct mirror_set *ms;
atomic_t error_count;
struct dm_dev *dev;
sector_t offset;
@ -974,6 +976,7 @@ static struct mirror_set *alloc_context(unsigned int nr_mirrors,
if (rh_init(&ms->rh, ms, dl, region_size, ms->nr_regions)) {
ti->error = "Error creating dirty region hash";
dm_io_client_destroy(ms->io_client);
kfree(ms);
return NULL;
}
@ -994,7 +997,7 @@ static void free_context(struct mirror_set *ms, struct dm_target *ti,
static inline int _check_region_size(struct dm_target *ti, uint32_t size)
{
return !(size % (PAGE_SIZE >> 9) || (size & (size - 1)) ||
return !(size % (PAGE_SIZE >> 9) || !is_power_of_2(size) ||
size > ti->len);
}
@ -1015,6 +1018,7 @@ static int get_mirror(struct mirror_set *ms, struct dm_target *ti,
return -ENXIO;
}
ms->mirror[mirror].ms = ms;
ms->mirror[mirror].offset = offset;
return 0;
@ -1163,16 +1167,14 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ms->kmirrord_wq = create_singlethread_workqueue("kmirrord");
if (!ms->kmirrord_wq) {
DMERR("couldn't start kmirrord");
free_context(ms, ti, m);
return -ENOMEM;
r = -ENOMEM;
goto err_free_context;
}
INIT_WORK(&ms->kmirrord_work, do_mirror);
r = parse_features(ms, argc, argv, &args_used);
if (r) {
free_context(ms, ti, ms->nr_mirrors);
return r;
}
if (r)
goto err_destroy_wq;
argv += args_used;
argc -= args_used;
@ -1188,19 +1190,22 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (argc) {
ti->error = "Too many mirror arguments";
free_context(ms, ti, ms->nr_mirrors);
return -EINVAL;
r = -EINVAL;
goto err_destroy_wq;
}
r = kcopyd_client_create(DM_IO_PAGES, &ms->kcopyd_client);
if (r) {
destroy_workqueue(ms->kmirrord_wq);
free_context(ms, ti, ms->nr_mirrors);
return r;
}
if (r)
goto err_destroy_wq;
wake(ms);
return 0;
err_destroy_wq:
destroy_workqueue(ms->kmirrord_wq);
err_free_context:
free_context(ms, ti, ms->nr_mirrors);
return r;
}
static void mirror_dtr(struct dm_target *ti)
@ -1302,7 +1307,7 @@ static void mirror_postsuspend(struct dm_target *ti)
wait_event(_kmirrord_recovery_stopped,
!atomic_read(&ms->rh.recovery_in_flight));
if (log->type->suspend && log->type->suspend(log))
if (log->type->postsuspend && log->type->postsuspend(log))
/* FIXME: need better error handling */
DMWARN("log suspend failed");
}

3
drivers/md/dm-snap.c
View File

@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/log2.h>
#include "dm-snap.h"
#include "dm-bio-list.h"
@ -415,7 +416,7 @@ static int set_chunk_size(struct dm_snapshot *s, const char *chunk_size_arg,
chunk_size = round_up(chunk_size, PAGE_SIZE >> 9);
/* Check chunk_size is a power of 2 */
if (chunk_size & (chunk_size - 1)) {
if (!is_power_of_2(chunk_size)) {
*error = "Chunk size is not a power of 2";
return -EINVAL;
}

3
drivers/md/dm-stripe.c
View File

@ -11,6 +11,7 @@
#include <linux/blkdev.h>
#include <linux/bio.h>
#include <linux/slab.h>
#include <linux/log2.h>
#define DM_MSG_PREFIX "striped"
@ -99,7 +100,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
/*
* chunk_size is a power of two
*/
if (!chunk_size || (chunk_size & (chunk_size - 1)) ||
if (!is_power_of_2(chunk_size) ||
(chunk_size < (PAGE_SIZE >> SECTOR_SHIFT))) {
ti->error = "Invalid chunk size";
return -EINVAL;

3
drivers/md/dm-table.c
View File

@ -213,12 +213,11 @@ static int alloc_targets(struct dm_table *t, unsigned int num)
int dm_table_create(struct dm_table **result, int mode,
unsigned num_targets, struct mapped_device *md)
{
struct dm_table *t = kmalloc(sizeof(*t), GFP_KERNEL);
struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
return -ENOMEM;
memset(t, 0, sizeof(*t));
INIT_LIST_HEAD(&t->devices);
atomic_set(&t->holders, 1);

6
drivers/md/dm-target.c
View File

@ -88,12 +88,10 @@ void dm_put_target_type(struct target_type *t)
static struct tt_internal *alloc_target(struct target_type *t)
{
struct tt_internal *ti = kmalloc(sizeof(*ti), GFP_KERNEL);
struct tt_internal *ti = kzalloc(sizeof(*ti), GFP_KERNEL);
if (ti) {
memset(ti, 0, sizeof(*ti));
if (ti)
ti->tt = *t;
}
return ti;
}

222
drivers/md/dm-uevent.c Normal file
View File

@ -0,0 +1,222 @@
/*
* Device Mapper Uevent Support (dm-uevent)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright IBM Corporation, 2007
* Author: Mike Anderson <andmike@linux.vnet.ibm.com>
*/
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/kobject.h>
#include <linux/dm-ioctl.h>
#include "dm.h"
#include "dm-uevent.h"
#define DM_MSG_PREFIX "uevent"
static const struct {
enum dm_uevent_type type;
enum kobject_action action;
char *name;
} _dm_uevent_type_names[] = {
{DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"},
{DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"},
};
static struct kmem_cache *_dm_event_cache;
struct dm_uevent {
struct mapped_device *md;
enum kobject_action action;
struct kobj_uevent_env ku_env;
struct list_head elist;
char name[DM_NAME_LEN];
char uuid[DM_UUID_LEN];
};
static void dm_uevent_free(struct dm_uevent *event)
{
kmem_cache_free(_dm_event_cache, event);
}
static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
{
struct dm_uevent *event;
event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC);
if (!event)
return NULL;
INIT_LIST_HEAD(&event->elist);
event->md = md;
return event;
}
static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md,
struct dm_target *ti,
enum kobject_action action,
const char *dm_action,
const char *path,
unsigned nr_valid_paths)
{
struct dm_uevent *event;
event = dm_uevent_alloc(md);
if (!event) {
DMERR("%s: dm_uevent_alloc() failed", __FUNCTION__);
goto err_nomem;
}
event->action = action;
if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) {
DMERR("%s: add_uevent_var() for DM_TARGET failed",
__FUNCTION__);
goto err_add;
}
if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) {
DMERR("%s: add_uevent_var() for DM_ACTION failed",
__FUNCTION__);
goto err_add;
}
if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u",
dm_next_uevent_seq(md))) {
DMERR("%s: add_uevent_var() for DM_SEQNUM failed",
__FUNCTION__);
goto err_add;
}
if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) {
DMERR("%s: add_uevent_var() for DM_PATH failed", __FUNCTION__);
goto err_add;
}
if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d",
nr_valid_paths)) {
DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed",
__FUNCTION__);
goto err_add;
}
return event;
err_add:
dm_uevent_free(event);
err_nomem:
return ERR_PTR(-ENOMEM);
}
/**
* dm_send_uevents - send uevents for given list
*
* @events: list of events to send
* @kobj: kobject generating event
*
*/
void dm_send_uevents(struct list_head *events, struct kobject *kobj)
{
int r;
struct dm_uevent *event, *next;
list_for_each_entry_safe(event, next, events, elist) {
list_del_init(&event->elist);
/*
* Need to call dm_copy_name_and_uuid from here for now.
* Context of previous var adds and locking used for
* hash_cell not compatable.
*/
if (dm_copy_name_and_uuid(event->md, event->name,
event->uuid)) {
DMERR("%s: dm_copy_name_and_uuid() failed",
__FUNCTION__);
goto uevent_free;
}
if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) {
DMERR("%s: add_uevent_var() for DM_NAME failed",
__FUNCTION__);
goto uevent_free;
}
if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) {
DMERR("%s: add_uevent_var() for DM_UUID failed",
__FUNCTION__);
goto uevent_free;
}
r = kobject_uevent_env(kobj, event->action, event->ku_env.envp);
if (r)
DMERR("%s: kobject_uevent_env failed", __FUNCTION__);
uevent_free:
dm_uevent_free(event);
}
}
EXPORT_SYMBOL_GPL(dm_send_uevents);
/**
* dm_path_uevent - called to create a new path event and queue it
*
* @event_type: path event type enum
* @ti: pointer to a dm_target
* @path: string containing pathname
* @nr_valid_paths: number of valid paths remaining
*
*/
void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti,
const char *path, unsigned nr_valid_paths)
{
struct mapped_device *md = dm_table_get_md(ti->table);
struct dm_uevent *event;
if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) {
DMERR("%s: Invalid event_type %d", __FUNCTION__, event_type);
goto out;
}
event = dm_build_path_uevent(md, ti,
_dm_uevent_type_names[event_type].action,
_dm_uevent_type_names[event_type].name,
path, nr_valid_paths);
if (IS_ERR(event))
goto out;
dm_uevent_add(md, &event->elist);
out:
dm_put(md);
}
EXPORT_SYMBOL_GPL(dm_path_uevent);
int dm_uevent_init(void)
{
_dm_event_cache = KMEM_CACHE(dm_uevent, 0);
if (!_dm_event_cache)
return -ENOMEM;
DMINFO("version 1.0.3");
return 0;
}
void dm_uevent_exit(void)
{
kmem_cache_destroy(_dm_event_cache);
}

59
drivers/md/dm-uevent.h Normal file
View File

@ -0,0 +1,59 @@
/*
* Device Mapper Uevent Support
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright IBM Corporation, 2007
* Author: Mike Anderson <andmike@linux.vnet.ibm.com>
*/
#ifndef DM_UEVENT_H
#define DM_UEVENT_H
enum dm_uevent_type {
DM_UEVENT_PATH_FAILED,
DM_UEVENT_PATH_REINSTATED,
};
#ifdef CONFIG_DM_UEVENT
extern int dm_uevent_init(void);
extern void dm_uevent_exit(void);
extern void dm_send_uevents(struct list_head *events, struct kobject *kobj);
extern void dm_path_uevent(enum dm_uevent_type event_type,
struct dm_target *ti, const char *path,
unsigned nr_valid_paths);
#else
static inline int dm_uevent_init(void)
{
return 0;
}
static inline void dm_uevent_exit(void)
{
}
static inline void dm_send_uevents(struct list_head *events,
struct kobject *kobj)
{
}
static inline void dm_path_uevent(enum dm_uevent_type event_type,
struct dm_target *ti, const char *path,
unsigned nr_valid_paths)
{
}
#endif /* CONFIG_DM_UEVENT */
#endif /* DM_UEVENT_H */

79
drivers/md/dm.c
View File

@ -7,6 +7,7 @@
#include "dm.h"
#include "dm-bio-list.h"
#include "dm-uevent.h"
#include <linux/init.h>
#include <linux/module.h>
@ -112,6 +113,9 @@ struct mapped_device {
*/
atomic_t event_nr;
wait_queue_head_t eventq;
atomic_t uevent_seq;
struct list_head uevent_list;
spinlock_t uevent_lock; /* Protect access to uevent_list */
/*
* freeze/thaw support require holding onto a super block
@ -143,11 +147,19 @@ static int __init local_init(void)
return -ENOMEM;
}
r = dm_uevent_init();
if (r) {
kmem_cache_destroy(_tio_cache);
kmem_cache_destroy(_io_cache);
return r;
}
_major = major;
r = register_blkdev(_major, _name);
if (r < 0) {
kmem_cache_destroy(_tio_cache);
kmem_cache_destroy(_io_cache);
dm_uevent_exit();
return r;
}
@ -162,6 +174,7 @@ static void local_exit(void)
kmem_cache_destroy(_tio_cache);
kmem_cache_destroy(_io_cache);
unregister_blkdev(_major, _name);
dm_uevent_exit();
_major = 0;
@ -751,15 +764,13 @@ static void __clone_and_map(struct clone_info *ci)
/*
* Split the bio into several clones.
*/
static void __split_bio(struct mapped_device *md, struct bio *bio)
static int __split_bio(struct mapped_device *md, struct bio *bio)
{
struct clone_info ci;
ci.map = dm_get_table(md);
if (!ci.map) {
bio_io_error(bio);
return;
}
if (unlikely(!ci.map))
return -EIO;
ci.md = md;
ci.bio = bio;
@ -779,6 +790,8 @@ static void __split_bio(struct mapped_device *md, struct bio *bio)
/* drop the extra reference count */
dec_pending(ci.io, 0);
dm_table_put(ci.map);
return 0;
}
/*-----------------------------------------------------------------
* CRUD END
@ -790,7 +803,7 @@ static void __split_bio(struct mapped_device *md, struct bio *bio)
*/
static int dm_request(struct request_queue *q, struct bio *bio)
{
int r;
int r = -EIO;
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
@ -815,18 +828,11 @@ static int dm_request(struct request_queue *q, struct bio *bio)
while (test_bit(DMF_BLOCK_IO, &md->flags)) {
up_read(&md->io_lock);
if (bio_rw(bio) == READA) {
bio_io_error(bio);
return 0;
}
if (bio_rw(bio) != READA)
r = queue_io(md, bio);
r = queue_io(md, bio);
if (r < 0) {
bio_io_error(bio);
return 0;
} else if (r == 0)
return 0; /* deferred successfully */
if (r <= 0)
goto out_req;
/*
* We're in a while loop, because someone could suspend
@ -835,8 +841,13 @@ static int dm_request(struct request_queue *q, struct bio *bio)
down_read(&md->io_lock);
}
__split_bio(md, bio);
r = __split_bio(md, bio);
up_read(&md->io_lock);
out_req:
if (r < 0)
bio_io_error(bio);
return 0;
}
@ -977,6 +988,9 @@ static struct mapped_device *alloc_dev(int minor)
atomic_set(&md->holders, 1);
atomic_set(&md->open_count, 0);
atomic_set(&md->event_nr, 0);
atomic_set(&md->uevent_seq, 0);
INIT_LIST_HEAD(&md->uevent_list);
spin_lock_init(&md->uevent_lock);
md->queue = blk_alloc_queue(GFP_KERNEL);
if (!md->queue)
@ -1044,12 +1058,14 @@ static struct mapped_device *alloc_dev(int minor)
return NULL;
}
static void unlock_fs(struct mapped_device *md);
static void free_dev(struct mapped_device *md)
{
int minor = md->disk->first_minor;
if (md->suspended_bdev) {
thaw_bdev(md->suspended_bdev, NULL);
unlock_fs(md);
bdput(md->suspended_bdev);
}
mempool_destroy(md->tio_pool);
@ -1073,8 +1089,16 @@ static void free_dev(struct mapped_device *md)
*/
static void event_callback(void *context)
{
unsigned long flags;
LIST_HEAD(uevents);
struct mapped_device *md = (struct mapped_device *) context;
spin_lock_irqsave(&md->uevent_lock, flags);
list_splice_init(&md->uevent_list, &uevents);
spin_unlock_irqrestore(&md->uevent_lock, flags);
dm_send_uevents(&uevents, &md->disk->kobj);
atomic_inc(&md->event_nr);
wake_up(&md->eventq);
}
@ -1233,7 +1257,8 @@ static void __flush_deferred_io(struct mapped_device *md, struct bio *c)
while (c) {
n = c->bi_next;
c->bi_next = NULL;
__split_bio(md, c);
if (__split_bio(md, c))
bio_io_error(c);
c = n;
}
}
@ -1491,6 +1516,11 @@ out:
/*-----------------------------------------------------------------
* Event notification.
*---------------------------------------------------------------*/
uint32_t dm_next_uevent_seq(struct mapped_device *md)
{
return atomic_add_return(1, &md->uevent_seq);
}
uint32_t dm_get_event_nr(struct mapped_device *md)
{
return atomic_read(&md->event_nr);
@ -1502,6 +1532,15 @@ int dm_wait_event(struct mapped_device *md, int event_nr)
(event_nr != atomic_read(&md->event_nr)));
}
void dm_uevent_add(struct mapped_device *md, struct list_head *elist)
{
unsigned long flags;
spin_lock_irqsave(&md->uevent_lock, flags);
list_add(elist, &md->uevent_list);
spin_unlock_irqrestore(&md->uevent_lock, flags);
}
/*
* The gendisk is only valid as long as you have a reference
* count on 'md'.

8
drivers/md/kcopyd.c
View File

@ -198,7 +198,7 @@ struct kcopyd_job {
* These fields are only used if the job has been split
* into more manageable parts.
*/
struct semaphore lock;
struct mutex lock;
atomic_t sub_jobs;
sector_t progress;
};
@ -456,7 +456,7 @@ static void segment_complete(int read_err,
sector_t count = 0;
struct kcopyd_job *job = (struct kcopyd_job *) context;
down(&job->lock);
mutex_lock(&job->lock);
/* update the error */
if (read_err)
@ -480,7 +480,7 @@ static void segment_complete(int read_err,
job->progress += count;
}
}
up(&job->lock);
mutex_unlock(&job->lock);
if (count) {
int i;
@ -562,7 +562,7 @@ int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
dispatch_job(job);
else {
init_MUTEX(&job->lock);
mutex_init(&job->lock);
job->progress = 0;
split_job(job);
}

3
include/linux/device-mapper.h
View File

@ -183,11 +183,14 @@ int dm_resume(struct mapped_device *md);
*/
uint32_t dm_get_event_nr(struct mapped_device *md);
int dm_wait_event(struct mapped_device *md, int event_nr);
uint32_t dm_next_uevent_seq(struct mapped_device *md);
void dm_uevent_add(struct mapped_device *md, struct list_head *elist);
/*
* Info functions.
*/
const char *dm_device_name(struct mapped_device *md);
int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
struct gendisk *dm_disk(struct mapped_device *md);
int dm_suspended(struct mapped_device *md);
int dm_noflush_suspending(struct dm_target *ti);

5
include/linux/dm-ioctl.h
View File

@ -131,6 +131,7 @@ struct dm_ioctl {
char name[DM_NAME_LEN]; /* device name */
char uuid[DM_UUID_LEN]; /* unique identifier for
* the block device */
char data[7]; /* padding or data */
};
/*
@ -285,9 +286,9 @@ typedef char ioctl_struct[308];
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 11
#define DM_VERSION_MINOR 12
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2006-10-12)"
#define DM_VERSION_EXTRA "-ioctl (2007-10-02)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */