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-rw-r--r--drivers/md/dm-crypt.c6
-rw-r--r--drivers/md/dm-delay.c6
-rw-r--r--drivers/md/dm-ioctl.c6
-rw-r--r--drivers/md/dm-linear.c6
-rw-r--r--drivers/md/dm-log.c40
-rw-r--r--drivers/md/dm-mpath.c6
-rw-r--r--drivers/md/dm-raid1.c24
-rw-r--r--drivers/md/dm-snap.c18
-rw-r--r--drivers/md/dm-stripe.c4
-rw-r--r--drivers/md/dm-table.c19
-rw-r--r--drivers/md/dm-target.c15
-rw-r--r--drivers/md/dm-zero.c5
-rw-r--r--drivers/md/dm.c58
-rw-r--r--drivers/md/dm.h1
-rw-r--r--include/linux/device-mapper.h27
15 files changed, 151 insertions, 90 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index ce26c84af064..dbc03c67fe98 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1322,11 +1322,7 @@ static int __init dm_crypt_init(void)
static void __exit dm_crypt_exit(void)
{
- int r = dm_unregister_target(&crypt_target);
-
- if (r < 0)
- DMERR("unregister failed %d", r);
-
+ dm_unregister_target(&crypt_target);
kmem_cache_destroy(_crypt_io_pool);
}
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 848b381f1173..59ee1b015d2d 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -364,11 +364,7 @@ bad_queue:
static void __exit dm_delay_exit(void)
{
- int r = dm_unregister_target(&delay_target);
-
- if (r < 0)
- DMERR("unregister failed %d", r);
-
+ dm_unregister_target(&delay_target);
kmem_cache_destroy(delayed_cache);
destroy_workqueue(kdelayd_wq);
}
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 777c948180f9..8da7a017b4ef 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1550,8 +1550,10 @@ int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid)
goto out;
}
- strcpy(name, hc->name);
- strcpy(uuid, hc->uuid ? : "");
+ if (name)
+ strcpy(name, hc->name);
+ if (uuid)
+ strcpy(uuid, hc->uuid ? : "");
out:
up_read(&_hash_lock);
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 44042becad8a..bfa107f59d96 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -142,6 +142,7 @@ static struct target_type linear_target = {
.status = linear_status,
.ioctl = linear_ioctl,
.merge = linear_merge,
+ .features = DM_TARGET_SUPPORTS_BARRIERS,
};
int __init dm_linear_init(void)
@@ -156,8 +157,5 @@ int __init dm_linear_init(void)
void dm_linear_exit(void)
{
- int r = dm_unregister_target(&linear_target);
-
- if (r < 0)
- DMERR("unregister failed %d", r);
+ dm_unregister_target(&linear_target);
}
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index a8c0fc79ca78..737961f275c1 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -326,8 +326,6 @@ static void header_from_disk(struct log_header *core, struct log_header *disk)
static int rw_header(struct log_c *lc, int rw)
{
lc->io_req.bi_rw = rw;
- lc->io_req.mem.ptr.vma = lc->disk_header;
- lc->io_req.notify.fn = NULL;
return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
}
@@ -362,10 +360,15 @@ static int read_header(struct log_c *log)
return 0;
}
-static inline int write_header(struct log_c *log)
+static int _check_region_size(struct dm_target *ti, uint32_t region_size)
{
- header_to_disk(&log->header, log->disk_header);
- return rw_header(log, WRITE);
+ if (region_size < 2 || region_size > ti->len)
+ return 0;
+
+ if (!is_power_of_2(region_size))
+ return 0;
+
+ return 1;
}
/*----------------------------------------------------------------
@@ -403,8 +406,9 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
}
}
- if (sscanf(argv[0], "%u", &region_size) != 1) {
- DMWARN("invalid region size string");
+ if (sscanf(argv[0], "%u", &region_size) != 1 ||
+ !_check_region_size(ti, region_size)) {
+ DMWARN("invalid region size %s", argv[0]);
return -EINVAL;
}
@@ -453,8 +457,18 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
*/
buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
bitset_size, ti->limits.hardsect_size);
+
+ if (buf_size > dev->bdev->bd_inode->i_size) {
+ DMWARN("log device %s too small: need %llu bytes",
+ dev->name, (unsigned long long)buf_size);
+ kfree(lc);
+ return -EINVAL;
+ }
+
lc->header_location.count = buf_size >> SECTOR_SHIFT;
+
lc->io_req.mem.type = DM_IO_VMA;
+ lc->io_req.notify.fn = NULL;
lc->io_req.client = dm_io_client_create(dm_div_up(buf_size,
PAGE_SIZE));
if (IS_ERR(lc->io_req.client)) {
@@ -467,10 +481,12 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
lc->disk_header = vmalloc(buf_size);
if (!lc->disk_header) {
DMWARN("couldn't allocate disk log buffer");
+ dm_io_client_destroy(lc->io_req.client);
kfree(lc);
return -ENOMEM;
}
+ lc->io_req.mem.ptr.vma = lc->disk_header;
lc->clean_bits = (void *)lc->disk_header +
(LOG_OFFSET << SECTOR_SHIFT);
}
@@ -482,6 +498,8 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
DMWARN("couldn't allocate sync bitset");
if (!dev)
vfree(lc->clean_bits);
+ else
+ dm_io_client_destroy(lc->io_req.client);
vfree(lc->disk_header);
kfree(lc);
return -ENOMEM;
@@ -495,6 +513,8 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
vfree(lc->sync_bits);
if (!dev)
vfree(lc->clean_bits);
+ else
+ dm_io_client_destroy(lc->io_req.client);
vfree(lc->disk_header);
kfree(lc);
return -ENOMEM;
@@ -631,8 +651,10 @@ static int disk_resume(struct dm_dirty_log *log)
/* set the correct number of regions in the header */
lc->header.nr_regions = lc->region_count;
+ header_to_disk(&lc->header, lc->disk_header);
+
/* write the new header */
- r = write_header(lc);
+ r = rw_header(lc, WRITE);
if (r) {
DMWARN("%s: Failed to write header on dirty region log device",
lc->log_dev->name);
@@ -682,7 +704,7 @@ static int disk_flush(struct dm_dirty_log *log)
if (!lc->touched)
return 0;
- r = write_header(lc);
+ r = rw_header(lc, WRITE);
if (r)
fail_log_device(lc);
else
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 3d7f4923cd13..345a26047ae0 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1495,14 +1495,10 @@ static int __init dm_multipath_init(void)
static void __exit dm_multipath_exit(void)
{
- int r;
-
destroy_workqueue(kmpath_handlerd);
destroy_workqueue(kmultipathd);
- r = dm_unregister_target(&multipath_target);
- if (r < 0)
- DMERR("target unregister failed %d", r);
+ dm_unregister_target(&multipath_target);
kmem_cache_destroy(_mpio_cache);
}
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index ec43f9fa4b2a..4d6bc101962e 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -197,9 +197,6 @@ static void fail_mirror(struct mirror *m, enum dm_raid1_error error_type)
struct mirror_set *ms = m->ms;
struct mirror *new;
- if (!errors_handled(ms))
- return;
-
/*
* error_count is used for nothing more than a
* simple way to tell if a device has encountered
@@ -210,6 +207,9 @@ static void fail_mirror(struct mirror *m, enum dm_raid1_error error_type)
if (test_and_set_bit(error_type, &m->error_type))
return;
+ if (!errors_handled(ms))
+ return;
+
if (m != get_default_mirror(ms))
goto out;
@@ -808,12 +808,6 @@ static void free_context(struct mirror_set *ms, struct dm_target *ti,
kfree(ms);
}
-static inline int _check_region_size(struct dm_target *ti, uint32_t size)
-{
- return !(size % (PAGE_SIZE >> 9) || !is_power_of_2(size) ||
- size > ti->len);
-}
-
static int get_mirror(struct mirror_set *ms, struct dm_target *ti,
unsigned int mirror, char **argv)
{
@@ -872,12 +866,6 @@ static struct dm_dirty_log *create_dirty_log(struct dm_target *ti,
return NULL;
}
- if (!_check_region_size(ti, dl->type->get_region_size(dl))) {
- ti->error = "Invalid region size";
- dm_dirty_log_destroy(dl);
- return NULL;
- }
-
return dl;
}
@@ -1300,11 +1288,7 @@ static int __init dm_mirror_init(void)
static void __exit dm_mirror_exit(void)
{
- int r;
-
- r = dm_unregister_target(&mirror_target);
- if (r < 0)
- DMERR("unregister failed %d", r);
+ dm_unregister_target(&mirror_target);
}
/* Module hooks */
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 6c96db26b87c..a8005b43a06b 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -9,6 +9,7 @@
#include <linux/blkdev.h>
#include <linux/ctype.h>
#include <linux/device-mapper.h>
+#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
@@ -735,7 +736,7 @@ static void snapshot_dtr(struct dm_target *ti)
unregister_snapshot(s);
while (atomic_read(&s->pending_exceptions_count))
- yield();
+ msleep(1);
/*
* Ensure instructions in mempool_destroy aren't reordered
* before atomic_read.
@@ -888,10 +889,10 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
/*
* Check for conflicting reads. This is extremely improbable,
- * so yield() is sufficient and there is no need for a wait queue.
+ * so msleep(1) is sufficient and there is no need for a wait queue.
*/
while (__chunk_is_tracked(s, pe->e.old_chunk))
- yield();
+ msleep(1);
/*
* Add a proper exception, and remove the
@@ -1469,17 +1470,10 @@ static int __init dm_snapshot_init(void)
static void __exit dm_snapshot_exit(void)
{
- int r;
-
destroy_workqueue(ksnapd);
- r = dm_unregister_target(&snapshot_target);
- if (r)
- DMERR("snapshot unregister failed %d", r);
-
- r = dm_unregister_target(&origin_target);
- if (r)
- DMERR("origin unregister failed %d", r);
+ dm_unregister_target(&snapshot_target);
+ dm_unregister_target(&origin_target);
exit_origin_hash();
kmem_cache_destroy(pending_cache);
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 9e4ef88d421e..41569bc60abc 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -337,9 +337,7 @@ int __init dm_stripe_init(void)
void dm_stripe_exit(void)
{
- if (dm_unregister_target(&stripe_target))
- DMWARN("target unregistration failed");
-
+ dm_unregister_target(&stripe_target);
destroy_workqueue(kstriped);
return;
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 04e5fd742c2c..ebaaf72cd822 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -38,6 +38,8 @@ struct dm_table {
sector_t *highs;
struct dm_target *targets;
+ unsigned barriers_supported:1;
+
/*
* Indicates the rw permissions for the new logical
* device. This should be a combination of FMODE_READ
@@ -227,6 +229,7 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
INIT_LIST_HEAD(&t->devices);
atomic_set(&t->holders, 1);
+ t->barriers_supported = 1;
if (!num_targets)
num_targets = KEYS_PER_NODE;
@@ -728,6 +731,10 @@ int dm_table_add_target(struct dm_table *t, const char *type,
/* FIXME: the plan is to combine high here and then have
* the merge fn apply the target level restrictions. */
combine_restrictions_low(&t->limits, &tgt->limits);
+
+ if (!(tgt->type->features & DM_TARGET_SUPPORTS_BARRIERS))
+ t->barriers_supported = 0;
+
return 0;
bad:
@@ -772,6 +779,12 @@ int dm_table_complete(struct dm_table *t)
check_for_valid_limits(&t->limits);
+ /*
+ * We only support barriers if there is exactly one underlying device.
+ */
+ if (!list_is_singular(&t->devices))
+ t->barriers_supported = 0;
+
/* how many indexes will the btree have ? */
leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);
t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);
@@ -986,6 +999,12 @@ struct mapped_device *dm_table_get_md(struct dm_table *t)
return t->md;
}
+int dm_table_barrier_ok(struct dm_table *t)
+{
+ return t->barriers_supported;
+}
+EXPORT_SYMBOL(dm_table_barrier_ok);
+
EXPORT_SYMBOL(dm_vcalloc);
EXPORT_SYMBOL(dm_get_device);
EXPORT_SYMBOL(dm_put_device);
diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c
index 835cf95b857f..7decf10006e4 100644
--- a/drivers/md/dm-target.c
+++ b/drivers/md/dm-target.c
@@ -130,26 +130,26 @@ int dm_register_target(struct target_type *t)
return rv;
}
-int dm_unregister_target(struct target_type *t)
+void dm_unregister_target(struct target_type *t)
{
struct tt_internal *ti;
down_write(&_lock);
if (!(ti = __find_target_type(t->name))) {
- up_write(&_lock);
- return -EINVAL;
+ DMCRIT("Unregistering unrecognised target: %s", t->name);
+ BUG();
}
if (ti->use) {
- up_write(&_lock);
- return -ETXTBSY;
+ DMCRIT("Attempt to unregister target still in use: %s",
+ t->name);
+ BUG();
}
list_del(&ti->list);
kfree(ti);
up_write(&_lock);
- return 0;
}
/*
@@ -187,8 +187,7 @@ int __init dm_target_init(void)
void dm_target_exit(void)
{
- if (dm_unregister_target(&error_target))
- DMWARN("error target unregistration failed");
+ dm_unregister_target(&error_target);
}
EXPORT_SYMBOL(dm_register_target);
diff --git a/drivers/md/dm-zero.c b/drivers/md/dm-zero.c
index cdbf126ec106..bbc97030c0c2 100644
--- a/drivers/md/dm-zero.c
+++ b/drivers/md/dm-zero.c
@@ -69,10 +69,7 @@ static int __init dm_zero_init(void)
static void __exit dm_zero_exit(void)
{
- int r = dm_unregister_target(&zero_target);
-
- if (r < 0)
- DMERR("unregister failed %d", r);
+ dm_unregister_target(&zero_target);
}
module_init(dm_zero_init)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 343094c3feeb..b194bb606dba 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -32,6 +32,7 @@ static unsigned int _major = 0;
static DEFINE_SPINLOCK(_minor_lock);
/*
+ * For bio-based dm.
* One of these is allocated per bio.
*/
struct dm_io {
@@ -43,6 +44,7 @@ struct dm_io {
};
/*
+ * For bio-based dm.
* One of these is allocated per target within a bio. Hopefully
* this will be simplified out one day.
*/
@@ -52,6 +54,27 @@ struct dm_target_io {
union map_info info;
};
+/*
+ * For request-based dm.
+ * One of these is allocated per request.
+ */
+struct dm_rq_target_io {
+ struct mapped_device *md;
+ struct dm_target *ti;
+ struct request *orig, clone;
+ int error;
+ union map_info info;
+};
+
+/*
+ * For request-based dm.
+ * One of these is allocated per bio.
+ */
+struct dm_rq_clone_bio_info {
+ struct bio *orig;
+ struct request *rq;
+};
+
DEFINE_TRACE(block_bio_complete);
union map_info *dm_get_mapinfo(struct bio *bio)
@@ -149,6 +172,8 @@ struct mapped_device {
#define MIN_IOS 256
static struct kmem_cache *_io_cache;
static struct kmem_cache *_tio_cache;
+static struct kmem_cache *_rq_tio_cache;
+static struct kmem_cache *_rq_bio_info_cache;
static int __init local_init(void)
{
@@ -164,9 +189,17 @@ static int __init local_init(void)
if (!_tio_cache)
goto out_free_io_cache;
+ _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0);
+ if (!_rq_tio_cache)
+ goto out_free_tio_cache;
+
+ _rq_bio_info_cache = KMEM_CACHE(dm_rq_clone_bio_info, 0);
+ if (!_rq_bio_info_cache)
+ goto out_free_rq_tio_cache;
+
r = dm_uevent_init();
if (r)
- goto out_free_tio_cache;
+ goto out_free_rq_bio_info_cache;
_major = major;
r = register_blkdev(_major, _name);
@@ -180,6 +213,10 @@ static int __init local_init(void)
out_uevent_exit:
dm_uevent_exit();
+out_free_rq_bio_info_cache:
+ kmem_cache_destroy(_rq_bio_info_cache);
+out_free_rq_tio_cache:
+ kmem_cache_destroy(_rq_tio_cache);
out_free_tio_cache:
kmem_cache_destroy(_tio_cache);
out_free_io_cache:
@@ -190,6 +227,8 @@ out_free_io_cache:
static void local_exit(void)
{
+ kmem_cache_destroy(_rq_bio_info_cache);
+ kmem_cache_destroy(_rq_tio_cache);
kmem_cache_destroy(_tio_cache);
kmem_cache_destroy(_io_cache);
unregister_blkdev(_major, _name);
@@ -796,7 +835,11 @@ static int __split_bio(struct mapped_device *md, struct bio *bio)
ci.map = dm_get_table(md);
if (unlikely(!ci.map))
return -EIO;
-
+ if (unlikely(bio_barrier(bio) && !dm_table_barrier_ok(ci.map))) {
+ dm_table_put(ci.map);
+ bio_endio(bio, -EOPNOTSUPP);
+ return 0;
+ }
ci.md = md;
ci.bio = bio;
ci.io = alloc_io(md);
@@ -880,15 +923,6 @@ static int dm_request(struct request_queue *q, struct bio *bio)
struct mapped_device *md = q->queuedata;
int cpu;
- /*
- * There is no use in forwarding any barrier request since we can't
- * guarantee it is (or can be) handled by the targets correctly.
- */
- if (unlikely(bio_barrier(bio))) {
- bio_endio(bio, -EOPNOTSUPP);
- return 0;
- }
-
down_read(&md->io_lock);
cpu = part_stat_lock();
@@ -1330,8 +1364,8 @@ void dm_put(struct mapped_device *md)
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
- __unbind(md);
dm_table_put(map);
+ __unbind(md);
free_dev(md);
}
}
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 0ade60cdef42..5b5d08ba9e92 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -51,6 +51,7 @@ int dm_table_any_congested(struct dm_table *t, int bdi_bits);
* To check the return value from dm_table_find_target().
*/
#define dm_target_is_valid(t) ((t)->table)
+int dm_table_barrier_ok(struct dm_table *t);
/*-----------------------------------------------------------------
* A registry of target types.
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index c17fd334e574..79c4000442d4 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -45,6 +45,8 @@ typedef void (*dm_dtr_fn) (struct dm_target *ti);
*/
typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio,
union map_info *map_context);
+typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone,
+ union map_info *map_context);
/*
* Returns:
@@ -57,6 +59,9 @@ typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio,
typedef int (*dm_endio_fn) (struct dm_target *ti,
struct bio *bio, int error,
union map_info *map_context);
+typedef int (*dm_request_endio_fn) (struct dm_target *ti,
+ struct request *clone, int error,
+ union map_info *map_context);
typedef void (*dm_flush_fn) (struct dm_target *ti);
typedef void (*dm_presuspend_fn) (struct dm_target *ti);
@@ -75,6 +80,13 @@ typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd,
typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
struct bio_vec *biovec, int max_size);
+/*
+ * Returns:
+ * 0: The target can handle the next I/O immediately.
+ * 1: The target can't handle the next I/O immediately.
+ */
+typedef int (*dm_busy_fn) (struct dm_target *ti);
+
void dm_error(const char *message);
/*
@@ -100,14 +112,23 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d);
/*
* Information about a target type
*/
+
+/*
+ * Target features
+ */
+#define DM_TARGET_SUPPORTS_BARRIERS 0x00000001
+
struct target_type {
+ uint64_t features;
const char *name;
struct module *module;
unsigned version[3];
dm_ctr_fn ctr;
dm_dtr_fn dtr;
dm_map_fn map;
+ dm_map_request_fn map_rq;
dm_endio_fn end_io;
+ dm_request_endio_fn rq_end_io;
dm_flush_fn flush;
dm_presuspend_fn presuspend;
dm_postsuspend_fn postsuspend;
@@ -117,6 +138,7 @@ struct target_type {
dm_message_fn message;
dm_ioctl_fn ioctl;
dm_merge_fn merge;
+ dm_busy_fn busy;
};
struct io_restrictions {
@@ -157,7 +179,7 @@ struct dm_target {
};
int dm_register_target(struct target_type *t);
-int dm_unregister_target(struct target_type *t);
+void dm_unregister_target(struct target_type *t);
/*-----------------------------------------------------------------
@@ -276,6 +298,9 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
*---------------------------------------------------------------*/
#define DM_NAME "device-mapper"
+#define DMCRIT(f, arg...) \
+ printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
+
#define DMERR(f, arg...) \
printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMERR_LIMIT(f, arg...) \
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-19 06:47:24 +0000