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-rw-r--r--Documentation/device-mapper/dm-raid.txt31
-rw-r--r--Documentation/device-mapper/statistics.txt4
-rw-r--r--drivers/md/dm-cache-policy-smq.c110
-rw-r--r--drivers/md/dm-cache-target.c39
-rw-r--r--drivers/md/dm-crypt.c4
-rw-r--r--drivers/md/dm-delay.c16
-rw-r--r--drivers/md/dm-flakey.c6
-rw-r--r--drivers/md/dm-linear.c7
-rw-r--r--drivers/md/dm-log-writes.c11
-rw-r--r--drivers/md/dm-raid1.c8
-rw-r--r--drivers/md/dm-snap-persistent.c2
-rw-r--r--drivers/md/dm-snap.c20
-rw-r--r--drivers/md/dm-stats.c14
-rw-r--r--drivers/md/dm-stripe.c8
-rw-r--r--drivers/md/dm-thin.c89
-rw-r--r--drivers/md/dm-verity.c17
-rw-r--r--drivers/md/dm.c2
-rw-r--r--drivers/md/persistent-data/dm-block-manager.c8
-rw-r--r--drivers/md/persistent-data/dm-btree-remove.c22
-rw-r--r--drivers/md/persistent-data/dm-btree.c6
-rw-r--r--include/uapi/linux/dm-ioctl.h4
21 files changed, 190 insertions, 238 deletions
diff --git a/Documentation/device-mapper/dm-raid.txt b/Documentation/device-mapper/dm-raid.txt
index cb12af3b51c2..df2d636b6088 100644
--- a/Documentation/device-mapper/dm-raid.txt
+++ b/Documentation/device-mapper/dm-raid.txt
@@ -209,6 +209,37 @@ include:
"repair" - Initiate a repair of the array.
"reshape"- Currently unsupported (-EINVAL).
+
+Discard Support
+---------------
+The implementation of discard support among hardware vendors varies.
+When a block is discarded, some storage devices will return zeroes when
+the block is read. These devices set the 'discard_zeroes_data'
+attribute. Other devices will return random data. Confusingly, some
+devices that advertise 'discard_zeroes_data' will not reliably return
+zeroes when discarded blocks are read! Since RAID 4/5/6 uses blocks
+from a number of devices to calculate parity blocks and (for performance
+reasons) relies on 'discard_zeroes_data' being reliable, it is important
+that the devices be consistent. Blocks may be discarded in the middle
+of a RAID 4/5/6 stripe and if subsequent read results are not
+consistent, the parity blocks may be calculated differently at any time;
+making the parity blocks useless for redundancy. It is important to
+understand how your hardware behaves with discards if you are going to
+enable discards with RAID 4/5/6.
+
+Since the behavior of storage devices is unreliable in this respect,
+even when reporting 'discard_zeroes_data', by default RAID 4/5/6
+discard support is disabled -- this ensures data integrity at the
+expense of losing some performance.
+
+Storage devices that properly support 'discard_zeroes_data' are
+increasingly whitelisted in the kernel and can thus be trusted.
+
+For trusted devices, the following dm-raid module parameter can be set
+to safely enable discard support for RAID 4/5/6:
+ 'devices_handle_discards_safely'
+
+
Version History
---------------
1.0.0 Initial version. Support for RAID 4/5/6
diff --git a/Documentation/device-mapper/statistics.txt b/Documentation/device-mapper/statistics.txt
index 4919b2dfd1b3..6f5ef944ca4c 100644
--- a/Documentation/device-mapper/statistics.txt
+++ b/Documentation/device-mapper/statistics.txt
@@ -121,6 +121,10 @@ Messages
Output format:
<region_id>: <start_sector>+<length> <step> <program_id> <aux_data>
+ precise_timestamps histogram:n1,n2,n3,...
+
+ The strings "precise_timestamps" and "histogram" are printed only
+ if they were specified when creating the region.
@stats_print <region_id> [<starting_line> <number_of_lines>]
diff --git a/drivers/md/dm-cache-policy-smq.c b/drivers/md/dm-cache-policy-smq.c
index 200366c62231..1ffbeb1b3ea6 100644
--- a/drivers/md/dm-cache-policy-smq.c
+++ b/drivers/md/dm-cache-policy-smq.c
@@ -772,7 +772,7 @@ struct smq_policy {
struct dm_cache_policy policy;
/* protects everything */
- struct mutex lock;
+ spinlock_t lock;
dm_cblock_t cache_size;
sector_t cache_block_size;
@@ -807,13 +807,7 @@ struct smq_policy {
/*
* Keeps track of time, incremented by the core. We use this to
* avoid attributing multiple hits within the same tick.
- *
- * Access to tick_protected should be done with the spin lock held.
- * It's copied to tick at the start of the map function (within the
- * mutex).
*/
- spinlock_t tick_lock;
- unsigned tick_protected;
unsigned tick;
/*
@@ -1296,46 +1290,20 @@ static void smq_destroy(struct dm_cache_policy *p)
kfree(mq);
}
-static void copy_tick(struct smq_policy *mq)
-{
- unsigned long flags, tick;
-
- spin_lock_irqsave(&mq->tick_lock, flags);
- tick = mq->tick_protected;
- if (tick != mq->tick) {
- update_sentinels(mq);
- end_hotspot_period(mq);
- end_cache_period(mq);
- mq->tick = tick;
- }
- spin_unlock_irqrestore(&mq->tick_lock, flags);
-}
-
-static bool maybe_lock(struct smq_policy *mq, bool can_block)
-{
- if (can_block) {
- mutex_lock(&mq->lock);
- return true;
- } else
- return mutex_trylock(&mq->lock);
-}
-
static int smq_map(struct dm_cache_policy *p, dm_oblock_t oblock,
bool can_block, bool can_migrate, bool fast_promote,
struct bio *bio, struct policy_locker *locker,
struct policy_result *result)
{
int r;
+ unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
result->op = POLICY_MISS;
- if (!maybe_lock(mq, can_block))
- return -EWOULDBLOCK;
-
- copy_tick(mq);
+ spin_lock_irqsave(&mq->lock, flags);
r = map(mq, bio, oblock, can_migrate, fast_promote, locker, result);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
@@ -1343,20 +1311,18 @@ static int smq_map(struct dm_cache_policy *p, dm_oblock_t oblock,
static int smq_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock)
{
int r;
+ unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
struct entry *e;
- if (!mutex_trylock(&mq->lock))
- return -EWOULDBLOCK;
-
+ spin_lock_irqsave(&mq->lock, flags);
e = h_lookup(&mq->table, oblock);
if (e) {
*cblock = infer_cblock(mq, e);
r = 0;
} else
r = -ENOENT;
-
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
@@ -1375,20 +1341,22 @@ static void __smq_set_clear_dirty(struct smq_policy *mq, dm_oblock_t oblock, boo
static void smq_set_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
{
+ unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
- mutex_lock(&mq->lock);
+ spin_lock_irqsave(&mq->lock, flags);
__smq_set_clear_dirty(mq, oblock, true);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
}
static void smq_clear_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
{
struct smq_policy *mq = to_smq_policy(p);
+ unsigned long flags;
- mutex_lock(&mq->lock);
+ spin_lock_irqsave(&mq->lock, flags);
__smq_set_clear_dirty(mq, oblock, false);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
}
static int smq_load_mapping(struct dm_cache_policy *p,
@@ -1433,14 +1401,14 @@ static int smq_walk_mappings(struct dm_cache_policy *p, policy_walk_fn fn,
struct smq_policy *mq = to_smq_policy(p);
int r = 0;
- mutex_lock(&mq->lock);
-
+ /*
+ * We don't need to lock here since this method is only called once
+ * the IO has stopped.
+ */
r = smq_save_hints(mq, &mq->clean, fn, context);
if (!r)
r = smq_save_hints(mq, &mq->dirty, fn, context);
- mutex_unlock(&mq->lock);
-
return r;
}
@@ -1458,10 +1426,11 @@ static void __remove_mapping(struct smq_policy *mq, dm_oblock_t oblock)
static void smq_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock)
{
struct smq_policy *mq = to_smq_policy(p);
+ unsigned long flags;
- mutex_lock(&mq->lock);
+ spin_lock_irqsave(&mq->lock, flags);
__remove_mapping(mq, oblock);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
}
static int __remove_cblock(struct smq_policy *mq, dm_cblock_t cblock)
@@ -1480,11 +1449,12 @@ static int __remove_cblock(struct smq_policy *mq, dm_cblock_t cblock)
static int smq_remove_cblock(struct dm_cache_policy *p, dm_cblock_t cblock)
{
int r;
+ unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
- mutex_lock(&mq->lock);
+ spin_lock_irqsave(&mq->lock, flags);
r = __remove_cblock(mq, cblock);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
@@ -1537,11 +1507,12 @@ static int smq_writeback_work(struct dm_cache_policy *p, dm_oblock_t *oblock,
dm_cblock_t *cblock, bool critical_only)
{
int r;
+ unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
- mutex_lock(&mq->lock);
+ spin_lock_irqsave(&mq->lock, flags);
r = __smq_writeback_work(mq, oblock, cblock, critical_only);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
@@ -1562,21 +1533,23 @@ static void __force_mapping(struct smq_policy *mq,
static void smq_force_mapping(struct dm_cache_policy *p,
dm_oblock_t current_oblock, dm_oblock_t new_oblock)
{
+ unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
- mutex_lock(&mq->lock);
+ spin_lock_irqsave(&mq->lock, flags);
__force_mapping(mq, current_oblock, new_oblock);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
}
static dm_cblock_t smq_residency(struct dm_cache_policy *p)
{
dm_cblock_t r;
+ unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
- mutex_lock(&mq->lock);
+ spin_lock_irqsave(&mq->lock, flags);
r = to_cblock(mq->cache_alloc.nr_allocated);
- mutex_unlock(&mq->lock);
+ spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
@@ -1586,15 +1559,12 @@ static void smq_tick(struct dm_cache_policy *p, bool can_block)
struct smq_policy *mq = to_smq_policy(p);
unsigned long flags;
- spin_lock_irqsave(&mq->tick_lock, flags);
- mq->tick_protected++;
- spin_unlock_irqrestore(&mq->tick_lock, flags);
-
- if (can_block) {
- mutex_lock(&mq->lock);
- copy_tick(mq);
- mutex_unlock(&mq->lock);
- }
+ spin_lock_irqsave(&mq->lock, flags);
+ mq->tick++;
+ update_sentinels(mq);
+ end_hotspot_period(mq);
+ end_cache_period(mq);
+ spin_unlock_irqrestore(&mq->lock, flags);
}
/* Init the policy plugin interface function pointers. */
@@ -1694,10 +1664,8 @@ static struct dm_cache_policy *smq_create(dm_cblock_t cache_size,
} else
mq->cache_hit_bits = NULL;
- mq->tick_protected = 0;
mq->tick = 0;
- mutex_init(&mq->lock);
- spin_lock_init(&mq->tick_lock);
+ spin_lock_init(&mq->lock);
q_init(&mq->hotspot, &mq->es, NR_HOTSPOT_LEVELS);
mq->hotspot.nr_top_levels = 8;
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 7245071778db..dd90d1236f4a 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -424,7 +424,6 @@ static void free_migration(struct dm_cache_migration *mg)
wake_up(&cache->migration_wait);
mempool_free(mg, cache->migration_pool);
- wake_worker(cache);
}
static int prealloc_data_structs(struct cache *cache, struct prealloc *p)
@@ -1064,14 +1063,6 @@ static void dec_io_migrations(struct cache *cache)
atomic_dec(&cache->nr_io_migrations);
}
-static void __cell_release(struct cache *cache, struct dm_bio_prison_cell *cell,
- bool holder, struct bio_list *bios)
-{
- (holder ? dm_cell_release : dm_cell_release_no_holder)
- (cache->prison, cell, bios);
- free_prison_cell(cache, cell);
-}
-
static bool discard_or_flush(struct bio *bio)
{
return bio->bi_rw & (REQ_FLUSH | REQ_FUA | REQ_DISCARD);
@@ -1079,14 +1070,13 @@ static bool discard_or_flush(struct bio *bio)
static void __cell_defer(struct cache *cache, struct dm_bio_prison_cell *cell)
{
- if (discard_or_flush(cell->holder))
+ if (discard_or_flush(cell->holder)) {
/*
- * We have to handle these bios
- * individually.
+ * We have to handle these bios individually.
*/
- __cell_release(cache, cell, true, &cache->deferred_bios);
-
- else
+ dm_cell_release(cache->prison, cell, &cache->deferred_bios);
+ free_prison_cell(cache, cell);
+ } else
list_add_tail(&cell->user_list, &cache->deferred_cells);
}
@@ -1113,7 +1103,7 @@ static void cell_defer(struct cache *cache, struct dm_bio_prison_cell *cell, boo
static void cell_error_with_code(struct cache *cache, struct dm_bio_prison_cell *cell, int err)
{
dm_cell_error(cache->prison, cell, err);
- dm_bio_prison_free_cell(cache->prison, cell);
+ free_prison_cell(cache, cell);
}
static void cell_requeue(struct cache *cache, struct dm_bio_prison_cell *cell)
@@ -1123,8 +1113,11 @@ static void cell_requeue(struct cache *cache, struct dm_bio_prison_cell *cell)
static void free_io_migration(struct dm_cache_migration *mg)
{
- dec_io_migrations(mg->cache);
+ struct cache *cache = mg->cache;
+
+ dec_io_migrations(cache);
free_migration(mg);
+ wake_worker(cache);
}
static void migration_failure(struct dm_cache_migration *mg)
@@ -1351,16 +1344,18 @@ static void issue_discard(struct dm_cache_migration *mg)
{
dm_dblock_t b, e;
struct bio *bio = mg->new_ocell->holder;
+ struct cache *cache = mg->cache;
- calc_discard_block_range(mg->cache, bio, &b, &e);
+ calc_discard_block_range(cache, bio, &b, &e);
while (b != e) {
- set_discard(mg->cache, b);
+ set_discard(cache, b);
b = to_dblock(from_dblock(b) + 1);
}
bio_endio(bio);
- cell_defer(mg->cache, mg->new_ocell, false);
+ cell_defer(cache, mg->new_ocell, false);
free_migration(mg);
+ wake_worker(cache);
}
static void issue_copy_or_discard(struct dm_cache_migration *mg)
@@ -1729,6 +1724,8 @@ static void remap_cell_to_origin_clear_discard(struct cache *cache,
remap_to_origin(cache, bio);
issue(cache, bio);
}
+
+ free_prison_cell(cache, cell);
}
static void remap_cell_to_cache_dirty(struct cache *cache, struct dm_bio_prison_cell *cell,
@@ -1763,6 +1760,8 @@ static void remap_cell_to_cache_dirty(struct cache *cache, struct dm_bio_prison_
remap_to_cache(cache, bio, cblock);
issue(cache, bio);
}
+
+ free_prison_cell(cache, cell);
}
/*----------------------------------------------------------------*/
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index ba5c2105f4e6..d60c88df5234 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1811,11 +1811,13 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
cc->iv_offset = tmpll;
- if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev)) {
+ ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), &cc->dev);
+ if (ret) {
ti->error = "Device lookup failed";
goto bad;
}
+ ret = -EINVAL;
if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
ti->error = "Invalid device sector";
goto bad;
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 57b6a1901c91..b34f6e27293d 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -129,6 +129,7 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
struct delay_c *dc;
unsigned long long tmpll;
char dummy;
+ int ret;
if (argc != 3 && argc != 6) {
ti->error = "requires exactly 3 or 6 arguments";
@@ -143,6 +144,7 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
dc->reads = dc->writes = 0;
+ ret = -EINVAL;
if (sscanf(argv[1], "%llu%c", &tmpll, &dummy) != 1) {
ti->error = "Invalid device sector";
goto bad;
@@ -154,12 +156,14 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad;
}
- if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
- &dc->dev_read)) {
+ ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
+ &dc->dev_read);
+ if (ret) {
ti->error = "Device lookup failed";
goto bad;
}
+ ret = -EINVAL;
dc->dev_write = NULL;
if (argc == 3)
goto out;
@@ -175,13 +179,15 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad_dev_read;
}
- if (dm_get_device(ti, argv[3], dm_table_get_mode(ti->table),
- &dc->dev_write)) {
+ ret = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table),
+ &dc->dev_write);
+ if (ret) {
ti->error = "Write device lookup failed";
goto bad_dev_read;
}
out:
+ ret = -EINVAL;
dc->kdelayd_wq = alloc_workqueue("kdelayd", WQ_MEM_RECLAIM, 0);
if (!dc->kdelayd_wq) {
DMERR("Couldn't start kdelayd");
@@ -208,7 +214,7 @@ bad_dev_read:
dm_put_device(ti, dc->dev_read);
bad:
kfree(dc);
- return -EINVAL;
+ return ret;
}
static void delay_dtr(struct dm_target *ti)
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index afab13bd683e..645e8b4f808e 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -183,6 +183,7 @@ static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
devname = dm_shift_arg(&as);
+ r = -EINVAL;
if (sscanf(dm_shift_arg(&as), "%llu%c", &tmpll, &dummy) != 1) {
ti->error = "Invalid device sector";
goto bad;
@@ -211,7 +212,8 @@ static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (r)
goto bad;
- if (dm_get_device(ti, devname, dm_table_get_mode(ti->table), &fc->dev)) {
+ r = dm_get_device(ti, devname, dm_table_get_mode(ti->table), &fc->dev);
+ if (r) {
ti->error = "Device lookup failed";
goto bad;
}
@@ -224,7 +226,7 @@ static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
bad:
kfree(fc);
- return -EINVAL;
+ return r;
}
static void flakey_dtr(struct dm_target *ti)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 7dd5fc8e3eea..436f5c9b6aea 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -30,6 +30,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
struct linear_c *lc;
unsigned long long tmp;
char dummy;
+ int ret;
if (argc != 2) {
ti->error = "Invalid argument count";
@@ -42,13 +43,15 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
return -ENOMEM;
}
+ ret = -EINVAL;
if (sscanf(argv[1], "%llu%c", &tmp, &dummy) != 1) {
ti->error = "dm-linear: Invalid device sector";
goto bad;
}
lc->start = tmp;
- if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &lc->dev)) {
+ ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &lc->dev);
+ if (ret) {
ti->error = "dm-linear: Device lookup failed";
goto bad;
}
@@ -61,7 +64,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
bad:
kfree(lc);
- return -EINVAL;
+ return ret;
}
static void linear_dtr(struct dm_target *ti)
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 316cc3fb741f..b2912dbac8bc 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -417,6 +417,7 @@ static int log_writes_ctr(struct dm_target *ti, unsigned int argc, char **argv)
struct log_writes_c *lc;
struct dm_arg_set as;
const char *devname, *logdevname;
+ int ret;
as.argc = argc;
as.argv = argv;
@@ -440,18 +441,22 @@ static int log_writes_ctr(struct dm_target *ti, unsigned int argc, char **argv)
atomic_set(&lc->pending_blocks, 0);
devname = dm_shift_arg(&as);
- if (dm_get_device(ti, devname, dm_table_get_mode(ti->table), &lc->dev)) {
+ ret = dm_get_device(ti, devname, dm_table_get_mode(ti->table), &lc->dev);
+ if (ret) {
ti->error = "Device lookup failed";
goto bad;
}
logdevname = dm_shift_arg(&as);
- if (dm_get_device(ti, logdevname, dm_table_get_mode(ti->table), &lc->logdev)) {
+ ret = dm_get_device(ti, logdevname, dm_table_get_mode(ti->table),
+ &lc->logdev);
+ if (ret) {
ti->error = "Log device lookup failed";
dm_put_device(ti, lc->dev);
goto bad;
}
+ ret = -EINVAL;
lc->log_kthread = kthread_run(log_writes_kthread, lc, "log-write");
if (!lc->log_kthread) {
ti->error = "Couldn't alloc kthread";
@@ -476,7 +481,7 @@ static int log_writes_ctr(struct dm_target *ti, unsigned int argc, char **argv)
bad:
kfree(lc);
- return -EINVAL;
+ return ret;
}
static int log_mark(struct log_writes_c *lc, char *data)
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index e1eabfb2f52d..f2a363a89629 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -945,16 +945,18 @@ static int get_mirror(struct mirror_set *ms, struct dm_target *ti,
{
unsigned long long offset;
char dummy;
+ int ret;
if (sscanf(argv[1], "%llu%c", &offset, &dummy) != 1) {
ti->error = "Invalid offset";
return -EINVAL;
}
- if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
- &ms->mirror[mirror].dev)) {
+ ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
+ &ms->mirror[mirror].dev);
+ if (ret) {
ti->error = "Device lookup failure";
- return -ENXIO;
+ return ret;
}
ms->mirror[mirror].ms = ms;
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 808b8419bc48..bf71583296f7 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -533,7 +533,7 @@ static int read_exceptions(struct pstore *ps,
chunk = area_location(ps, ps->current_area);
area = dm_bufio_read(client, chunk, &bp);
- if (unlikely(IS_ERR(area))) {
+ if (IS_ERR(area)) {
r = PTR_ERR(area);
goto ret_destroy_bufio;
}
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index d10b6876018e..c0bcd6516dfe 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -63,6 +63,13 @@ struct dm_snapshot {
*/
int valid;
+ /*
+ * The snapshot overflowed because of a write to the snapshot device.
+ * We don't have to invalidate the snapshot in this case, but we need
+ * to prevent further writes.
+ */
+ int snapshot_overflowed;
+
/* Origin writes don't trigger exceptions until this is set */
int active;
@@ -1152,6 +1159,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
s->ti = ti;
s->valid = 1;
+ s->snapshot_overflowed = 0;
s->active = 0;
atomic_set(&s->pending_exceptions_count, 0);
s->exception_start_sequence = 0;
@@ -1301,6 +1309,7 @@ static void __handover_exceptions(struct dm_snapshot *snap_src,
snap_dest->ti->max_io_len = snap_dest->store->chunk_size;
snap_dest->valid = snap_src->valid;
+ snap_dest->snapshot_overflowed = snap_src->snapshot_overflowed;
/*
* Set source invalid to ensure it receives no further I/O.
@@ -1691,7 +1700,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
* to copy an exception */
down_write(&s->lock);
- if (!s->valid) {
+ if (!s->valid || (unlikely(s->snapshot_overflowed) && bio_rw(bio) == WRITE)) {
r = -EIO;
goto out_unlock;
}
@@ -1715,7 +1724,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
pe = alloc_pending_exception(s);
down_write(&s->lock);
- if (!s->valid) {
+ if (!s->valid || s->snapshot_overflowed) {
free_pending_exception(pe);
r = -EIO;
goto out_unlock;
@@ -1730,7 +1739,8 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
pe = __find_pending_exception(s, pe, chunk);
if (!pe) {
- __invalidate_snapshot(s, -ENOMEM);
+ s->snapshot_overflowed = 1;
+ DMERR("Snapshot overflowed: Unable to allocate exception.");
r = -EIO;
goto out_unlock;
}
@@ -1990,6 +2000,8 @@ static void snapshot_status(struct dm_target *ti, status_type_t type,
DMEMIT("Invalid");
else if (snap->merge_failed)
DMEMIT("Merge failed");
+ else if (snap->snapshot_overflowed)
+ DMEMIT("Overflow");
else {
if (snap->store->type->usage) {
sector_t total_sectors, sectors_allocated,
@@ -2353,7 +2365,7 @@ static struct target_type origin_target = {
static struct target_type snapshot_target = {
.name = "snapshot",
- .version = {1, 13, 0},
+ .version = {1, 14, 0},
.module = THIS_MODULE,
.ctr = snapshot_ctr,
.dtr = snapshot_dtr,
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 8a8b48fa901a..8289804ccd99 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -457,12 +457,24 @@ static int dm_stats_list(struct dm_stats *stats, const char *program,
list_for_each_entry(s, &stats->list, list_entry) {
if (!program || !strcmp(program, s->program_id)) {
len = s->end - s->start;
- DMEMIT("%d: %llu+%llu %llu %s %s\n", s->id,
+ DMEMIT("%d: %llu+%llu %llu %s %s", s->id,
(unsigned long long)s->start,
(unsigned long long)len,
(unsigned long long)s->step,
s->program_id,
s->aux_data);
+ if (s->stat_flags & STAT_PRECISE_TIMESTAMPS)
+ DMEMIT(" precise_timestamps");
+ if (s->n_histogram_entries) {
+ unsigned i;
+ DMEMIT(" histogram:");
+ for (i = 0; i < s->n_histogram_entries; i++) {
+ if (i)
+ DMEMIT(",");
+ DMEMIT("%llu", s->histogram_boundaries[i]);
+ }
+ }
+ DMEMIT("\n");
}
}
mutex_unlock(&stats->mutex);
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 484029db8cba..797ddb900b06 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -75,13 +75,15 @@ static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
{
unsigned long long start;
char dummy;
+ int ret;
if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1)
return -EINVAL;
- if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
- &sc->stripe[stripe].dev))
- return -ENXIO;
+ ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
+ &sc->stripe[stripe].dev);
+ if (ret)
+ return ret;
sc->stripe[stripe].physical_start = start;
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 271a66249363..6578b7bc1fbb 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -332,9 +332,6 @@ struct thin_c {
*
* Description:
* Asynchronously issue a discard request for the sectors in question.
- * NOTE: this variant of blk-core's blkdev_issue_discard() is a stop-gap
- * that is being kept local to DM thinp until the block changes to allow
- * late bio splitting land upstream.
*/
static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, unsigned long flags,
@@ -342,91 +339,36 @@ static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sect
{
struct request_queue *q = bdev_get_queue(bdev);
int type = REQ_WRITE | REQ_DISCARD;
- unsigned int max_discard_sectors, granularity;
- int alignment;
struct bio *bio;
- int ret = 0;
- struct blk_plug plug;
- if (!q)
+ if (!q || !nr_sects)
return -ENXIO;
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
- /* Zero-sector (unknown) and one-sector granularities are the same. */
- granularity = max(q->limits.discard_granularity >> 9, 1U);
- alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
-
- /*
- * Ensure that max_discard_sectors is of the proper
- * granularity, so that requests stay aligned after a split.
- */
- max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9);
- max_discard_sectors -= max_discard_sectors % granularity;
- if (unlikely(!max_discard_sectors)) {
- /* Avoid infinite loop below. Being cautious never hurts. */
- return -EOPNOTSUPP;
- }
-
if (flags & BLKDEV_DISCARD_SECURE) {
if (!blk_queue_secdiscard(q))
return -EOPNOTSUPP;
type |= REQ_SECURE;
}
- blk_start_plug(&plug);
- while (nr_sects) {
- unsigned int req_sects;
- sector_t end_sect, tmp;
-
- /*
- * Required bio_put occurs in bio_endio thanks to bio_chain below
- */
- bio = bio_alloc(gfp_mask, 1);
- if (!bio) {
- ret = -ENOMEM;
- break;
- }
-
- req_sects = min_t(sector_t, nr_sects, max_discard_sectors);
-
- /*
- * If splitting a request, and the next starting sector would be
- * misaligned, stop the discard at the previous aligned sector.
- */
- end_sect = sector + req_sects;
- tmp = end_sect;
- if (req_sects < nr_sects &&
- sector_div(tmp, granularity) != alignment) {
- end_sect = end_sect - alignment;
- sector_div(end_sect, granularity);
- end_sect = end_sect * granularity + alignment;
- req_sects = end_sect - sector;
- }
-
- bio_chain(bio, parent_bio);
-
- bio->bi_iter.bi_sector = sector;
- bio->bi_bdev = bdev;
+ /*
+ * Required bio_put occurs in bio_endio thanks to bio_chain below
+ */
+ bio = bio_alloc(gfp_mask, 1);
+ if (!bio)
+ return -ENOMEM;
- bio->bi_iter.bi_size = req_sects << 9;
- nr_sects -= req_sects;
- sector = end_sect;
+ bio_chain(bio, parent_bio);
- submit_bio(type, bio);
+ bio->bi_iter.bi_sector = sector;
+ bio->bi_bdev = bdev;
+ bio->bi_iter.bi_size = nr_sects << 9;
- /*
- * We can loop for a long time in here, if someone does
- * full device discards (like mkfs). Be nice and allow
- * us to schedule out to avoid softlocking if preempt
- * is disabled.
- */
- cond_resched();
- }
- blk_finish_plug(&plug);
+ submit_bio(type, bio);
- return ret;
+ return 0;
}
static bool block_size_is_power_of_two(struct pool *pool)
@@ -1543,9 +1485,8 @@ static void process_discard_cell_no_passdown(struct thin_c *tc,
}
/*
- * FIXME: DM local hack to defer parent bios's end_io until we
- * _know_ all chained sub range discard bios have completed.
- * Will go away once late bio splitting lands upstream!
+ * __bio_inc_remaining() is used to defer parent bios's end_io until
+ * we _know_ all chained sub range discard bios have completed.
*/
static inline void __bio_inc_remaining(struct bio *bio)
{
diff --git a/drivers/md/dm-verity.c b/drivers/md/dm-verity.c
index c137dcb147b8..edc624bccf9a 100644
--- a/drivers/md/dm-verity.c
+++ b/drivers/md/dm-verity.c
@@ -26,8 +26,6 @@
#define DM_VERITY_ENV_LENGTH 42
#define DM_VERITY_ENV_VAR_NAME "DM_VERITY_ERR_BLOCK_NR"
-#define DM_VERITY_IO_VEC_INLINE 16
-#define DM_VERITY_MEMPOOL_SIZE 4
#define DM_VERITY_DEFAULT_PREFETCH_SIZE 262144
#define DM_VERITY_MAX_LEVELS 63
@@ -76,8 +74,6 @@ struct dm_verity {
enum verity_mode mode; /* mode for handling verification errors */
unsigned corrupted_errs;/* Number of errors for corrupted blocks */
- mempool_t *vec_mempool; /* mempool of bio vector */
-
struct workqueue_struct *verify_wq;
/* starting blocks for each tree level. 0 is the lowest level. */
@@ -271,7 +267,7 @@ static int verity_verify_level(struct dm_verity_io *io, sector_t block,
verity_hash_at_level(v, block, level, &hash_block, &offset);
data = dm_bufio_read(v->bufio, hash_block, &buf);
- if (unlikely(IS_ERR(data)))
+ if (IS_ERR(data))
return PTR_ERR(data);
aux = dm_bufio_get_aux_data(buf);
@@ -677,9 +673,6 @@ static void verity_dtr(struct dm_target *ti)
if (v->verify_wq)
destroy_workqueue(v->verify_wq);
- if (v->vec_mempool)
- mempool_destroy(v->vec_mempool);
-
if (v->bufio)
dm_bufio_client_destroy(v->bufio);
@@ -948,14 +941,6 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv)
ti->per_bio_data_size = roundup(sizeof(struct dm_verity_io) + v->shash_descsize + v->digest_size * 2, __alignof__(struct dm_verity_io));
- v->vec_mempool = mempool_create_kmalloc_pool(DM_VERITY_MEMPOOL_SIZE,
- BIO_MAX_PAGES * sizeof(struct bio_vec));
- if (!v->vec_mempool) {
- ti->error = "Cannot allocate vector mempool";
- r = -ENOMEM;
- goto bad;
- }
-
/* WQ_UNBOUND greatly improves performance when running on ramdisk */
v->verify_wq = alloc_workqueue("kverityd", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND, num_online_cpus());
if (!v->verify_wq) {
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 6ffc01bb85f2..6264781dc69a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1464,7 +1464,7 @@ static void __map_bio(struct dm_target_io *tio)
md = tio->io->md;
dec_pending(tio->io, r);
free_tio(md, tio);
- } else if (r) {
+ } else if (r != DM_MAPIO_SUBMITTED) {
DMWARN("unimplemented target map return value: %d", r);
BUG();
}
diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c
index 4d6c9b689eaa..88dbe7b97c2c 100644
--- a/drivers/md/persistent-data/dm-block-manager.c
+++ b/drivers/md/persistent-data/dm-block-manager.c
@@ -454,7 +454,7 @@ int dm_bm_read_lock(struct dm_block_manager *bm, dm_block_t b,
int r;
p = dm_bufio_read(bm->bufio, b, (struct dm_buffer **) result);
- if (unlikely(IS_ERR(p)))
+ if (IS_ERR(p))
return PTR_ERR(p);
aux = dm_bufio_get_aux_data(to_buffer(*result));
@@ -490,7 +490,7 @@ int dm_bm_write_lock(struct dm_block_manager *bm,
return -EPERM;
p = dm_bufio_read(bm->bufio, b, (struct dm_buffer **) result);
- if (unlikely(IS_ERR(p)))
+ if (IS_ERR(p))
return PTR_ERR(p);
aux = dm_bufio_get_aux_data(to_buffer(*result));
@@ -523,7 +523,7 @@ int dm_bm_read_try_lock(struct dm_block_manager *bm,
int r;
p = dm_bufio_get(bm->bufio, b, (struct dm_buffer **) result);
- if (unlikely(IS_ERR(p)))
+ if (IS_ERR(p))
return PTR_ERR(p);
if (unlikely(!p))
return -EWOULDBLOCK;
@@ -559,7 +559,7 @@ int dm_bm_write_lock_zero(struct dm_block_manager *bm,
return -EPERM;
p = dm_bufio_new(bm->bufio, b, (struct dm_buffer **) result);
- if (unlikely(IS_ERR(p)))
+ if (IS_ERR(p))
return PTR_ERR(p);
memset(p, 0, dm_bm_block_size(bm));
diff --git a/drivers/md/persistent-data/dm-btree-remove.c b/drivers/md/persistent-data/dm-btree-remove.c
index 4222f774cf36..421a36c593e3 100644
--- a/drivers/md/persistent-data/dm-btree-remove.c
+++ b/drivers/md/persistent-data/dm-btree-remove.c
@@ -409,29 +409,11 @@ static int rebalance3(struct shadow_spine *s, struct dm_btree_info *info,
return 0;
}
-static int get_nr_entries(struct dm_transaction_manager *tm,
- dm_block_t b, uint32_t *result)
-{
- int r;
- struct dm_block *block;
- struct btree_node *n;
-
- r = dm_tm_read_lock(tm, b, &btree_node_validator, &block);
- if (r)
- return r;
-
- n = dm_block_data(block);
- *result = le32_to_cpu(n->header.nr_entries);
-
- return dm_tm_unlock(tm, block);
-}
-
static int rebalance_children(struct shadow_spine *s,
struct dm_btree_info *info,
struct dm_btree_value_type *vt, uint64_t key)
{
int i, r, has_left_sibling, has_right_sibling;
- uint32_t child_entries;
struct btree_node *n;
n = dm_block_data(shadow_current(s));
@@ -458,10 +440,6 @@ static int rebalance_children(struct shadow_spine *s,
if (i < 0)
return -ENODATA;
- r = get_nr_entries(info->tm, value64(n, i), &child_entries);
- if (r)
- return r;
-
has_left_sibling = i > 0;
has_right_sibling = i < (le32_to_cpu(n->header.nr_entries) - 1);
diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index c7726cebc495..b6cec258cc21 100644
--- a/drivers/md/persistent-data/dm-btree.c
+++ b/drivers/md/persistent-data/dm-btree.c
@@ -420,8 +420,8 @@ EXPORT_SYMBOL_GPL(dm_btree_lookup);
*
* Where A* is a shadow of A.
*/
-static int btree_split_sibling(struct shadow_spine *s, dm_block_t root,
- unsigned parent_index, uint64_t key)
+static int btree_split_sibling(struct shadow_spine *s, unsigned parent_index,
+ uint64_t key)
{
int r;
size_t size;
@@ -625,7 +625,7 @@ static int btree_insert_raw(struct shadow_spine *s, dm_block_t root,
if (top)
r = btree_split_beneath(s, key);
else
- r = btree_split_sibling(s, root, i, key);
+ r = btree_split_sibling(s, i, key);
if (r < 0)
return r;
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index 061aca3a962d..d34611e35a30 100644
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 32
+#define DM_VERSION_MINOR 33
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2015-6-26)"
+#define DM_VERSION_EXTRA "-ioctl (2015-8-18)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 16:31:22 +0000