- Enable DM core bioset's per-cpu bio cache if QUEUE_FLAG_POLL
set. This change improves DM's hipri bio polling (REQ_POLLED)
performance by 7 - 20% depending on the system.
- Update DM core to use jump_labels to further reduce cost of unlikely
branches for zoned block devices, dm-stats and swap_bios throttling.
- Various DM core changes to reduce bio-based DM overhead and simplify
IO accounting.
- Fundamental DM core improvements to dm_io reference counting and the
elimination of using bio_split()+bio_chain() -- instead DM's
bio-based IO accounting is updated to account that a split occurred.
- Improve DM core's abnormal bio processing to do less work.
- Improve DM core's hipri polling support to use a single list rather
than an hlist.
- Update DM core to pass NULL bdev to bio_alloc_clone() so that
initialization that isn't useful for DM can be elided.
- Add cond_resched to DM stats' various loops that loop over all
entries.
- Fix incorrect error code return from DM integrity's constructor.
- Make DM crypt's printing of the key constant-time.
- Update bio-based DM multipath to provide high-resolution timer to
the Historical Service Time (HST) path selector.
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-----END PGP SIGNATURE-----
Merge tag 'for-5.19/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull device mapper updates from Mike Snitzer:
- Enable DM core bioset's per-cpu bio cache if QUEUE_FLAG_POLL set.
This change improves DM's hipri bio polling (REQ_POLLED) performance
by 7 - 20% depending on the system.
- Update DM core to use jump_labels to further reduce cost of unlikely
branches for zoned block devices, dm-stats and swap_bios throttling.
- Various DM core changes to reduce bio-based DM overhead and simplify
IO accounting.
- Fundamental DM core improvements to dm_io reference counting and the
elimination of using bio_split()+bio_chain() -- instead DM's
bio-based IO accounting is updated to account that a split occurred.
- Improve DM core's abnormal bio processing to do less work.
- Improve DM core's hipri polling support to use a single list rather
than an hlist.
- Update DM core to pass NULL bdev to bio_alloc_clone() so that
initialization that isn't useful for DM can be elided.
- Add cond_resched to DM stats' various loops that loop over all
entries.
- Fix incorrect error code return from DM integrity's constructor.
- Make DM crypt's printing of the key constant-time.
- Update bio-based DM multipath to provide high-resolution timer to the
Historical Service Time (HST) path selector.
* tag 'for-5.19/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (26 commits)
dm: pass NULL bdev to bio_alloc_clone
dm cache metadata: remove unnecessary variable in __dump_mapping
dm mpath: provide high-resolution timer to HST for bio-based
dm crypt: make printing of the key constant-time
dm integrity: fix error code in dm_integrity_ctr()
dm stats: add cond_resched when looping over entries
dm: improve abnormal bio processing
dm: simplify bio-based IO accounting further
dm: put all polled dm_io instances into a single list
dm: improve dm_io reference counting
dm: don't grab target io reference in dm_zone_map_bio
dm: improve bio splitting and associated IO accounting
dm: switch to bdev based IO accounting interfaces
dm: pass dm_io instance to dm_io_acct directly
dm: don't pass bio to __dm_start_io_acct and dm_end_io_acct
dm: use bio_sectors in dm_aceept_partial_bio
dm: simplify basic targets
dm: conditionally enable branching for less used features
dm: introduce dm_{get,put}_live_table_bio called from dm_submit_bio
dm: move hot dm_io members to same cacheline as dm_target_io
...
This commit is contained in:
Linus Torvalds
commit
7e284070ab
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@ -1509,7 +1509,6 @@ int dm_cache_load_mappings(struct dm_cache_metadata *cmd,
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static int __dump_mapping(void *context, uint64_t cblock, void *leaf)
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{
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int r = 0;
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__le64 value;
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dm_oblock_t oblock;
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unsigned flags;
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@ -1517,7 +1516,7 @@ static int __dump_mapping(void *context, uint64_t cblock, void *leaf)
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memcpy(&value, leaf, sizeof(value));
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unpack_value(value, &oblock, &flags);
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return r;
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return 0;
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}
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static int __dump_mappings(struct dm_cache_metadata *cmd)
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|
|
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@ -13,6 +13,7 @@
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#include <linux/ktime.h>
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#include <linux/blk-mq.h>
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#include <linux/blk-crypto-profile.h>
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#include <linux/jump_label.h>
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#include <trace/events/block.h>
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@ -154,6 +155,10 @@ static inline struct dm_stats *dm_get_stats(struct mapped_device *md)
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return &md->stats;
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}
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DECLARE_STATIC_KEY_FALSE(stats_enabled);
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DECLARE_STATIC_KEY_FALSE(swap_bios_enabled);
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DECLARE_STATIC_KEY_FALSE(zoned_enabled);
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static inline bool dm_emulate_zone_append(struct mapped_device *md)
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{
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if (blk_queue_is_zoned(md->queue))
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|
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@ -237,6 +242,12 @@ static inline void dm_tio_set_flag(struct dm_target_io *tio, unsigned int bit)
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tio->flags |= (1U << bit);
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}
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static inline bool dm_tio_is_normal(struct dm_target_io *tio)
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{
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return (dm_tio_flagged(tio, DM_TIO_INSIDE_DM_IO) &&
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!dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO));
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}
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/*
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* One of these is allocated per original bio.
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* It contains the first clone used for that original.
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@ -245,16 +256,20 @@ static inline void dm_tio_set_flag(struct dm_target_io *tio, unsigned int bit)
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struct dm_io {
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unsigned short magic;
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blk_short_t flags;
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atomic_t io_count;
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struct mapped_device *md;
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struct bio *orig_bio;
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blk_status_t status;
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spinlock_t lock;
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unsigned long start_time;
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void *data;
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struct hlist_node node;
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struct task_struct *map_task;
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struct dm_io *next;
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struct dm_stats_aux stats_aux;
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blk_status_t status;
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atomic_t io_count;
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struct mapped_device *md;
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/* The three fields represent mapped part of original bio */
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struct bio *orig_bio;
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unsigned int sector_offset; /* offset to end of orig_bio */
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unsigned int sectors;
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/* last member of dm_target_io is 'struct bio' */
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struct dm_target_io tio;
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};
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@ -263,8 +278,8 @@ struct dm_io {
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* dm_io flags
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*/
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enum {
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DM_IO_START_ACCT,
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DM_IO_ACCOUNTED
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DM_IO_ACCOUNTED,
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DM_IO_WAS_SPLIT
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};
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static inline bool dm_io_flagged(struct dm_io *io, unsigned int bit)
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@ -277,13 +292,6 @@ static inline void dm_io_set_flag(struct dm_io *io, unsigned int bit)
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io->flags |= (1U << bit);
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}
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static inline void dm_io_inc_pending(struct dm_io *io)
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{
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atomic_inc(&io->io_count);
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}
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void dm_io_dec_pending(struct dm_io *io, blk_status_t error);
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static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
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{
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return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;
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|
|
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|
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@ -3439,6 +3439,11 @@ static int crypt_map(struct dm_target *ti, struct bio *bio)
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return DM_MAPIO_SUBMITTED;
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}
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static char hex2asc(unsigned char c)
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{
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return c + '0' + ((unsigned)(9 - c) >> 4 & 0x27);
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}
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static void crypt_status(struct dm_target *ti, status_type_t type,
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unsigned status_flags, char *result, unsigned maxlen)
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{
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|
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@ -3457,9 +3462,12 @@ static void crypt_status(struct dm_target *ti, status_type_t type,
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if (cc->key_size > 0) {
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if (cc->key_string)
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DMEMIT(":%u:%s", cc->key_size, cc->key_string);
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else
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for (i = 0; i < cc->key_size; i++)
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DMEMIT("%02x", cc->key[i]);
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else {
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for (i = 0; i < cc->key_size; i++) {
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DMEMIT("%c%c", hex2asc(cc->key[i] >> 4),
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hex2asc(cc->key[i] & 0xf));
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}
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}
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} else
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DMEMIT("-");
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|
|
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|
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@ -296,8 +296,7 @@ static int delay_map(struct dm_target *ti, struct bio *bio)
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}
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delayed->class = c;
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bio_set_dev(bio, c->dev->bdev);
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if (bio_sectors(bio))
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bio->bi_iter.bi_sector = c->start + dm_target_offset(ti, bio->bi_iter.bi_sector);
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bio->bi_iter.bi_sector = c->start + dm_target_offset(ti, bio->bi_iter.bi_sector);
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return delay_bio(dc, c, bio);
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}
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|
|
|
|||
|
|
@ -280,9 +280,7 @@ static void flakey_map_bio(struct dm_target *ti, struct bio *bio)
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struct flakey_c *fc = ti->private;
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bio_set_dev(bio, fc->dev->bdev);
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if (bio_sectors(bio) || op_is_zone_mgmt(bio_op(bio)))
|
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bio->bi_iter.bi_sector =
|
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flakey_map_sector(ti, bio->bi_iter.bi_sector);
|
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bio->bi_iter.bi_sector = flakey_map_sector(ti, bio->bi_iter.bi_sector);
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}
|
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static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
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|
|
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|||
|
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@ -4494,8 +4494,6 @@ try_smaller_buffer:
|
|||
}
|
||||
|
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if (should_write_sb) {
|
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int r;
|
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|
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init_journal(ic, 0, ic->journal_sections, 0);
|
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r = dm_integrity_failed(ic);
|
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if (unlikely(r)) {
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|
|
|
|||
|
|
@ -84,19 +84,12 @@ static sector_t linear_map_sector(struct dm_target *ti, sector_t bi_sector)
|
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return lc->start + dm_target_offset(ti, bi_sector);
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}
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static void linear_map_bio(struct dm_target *ti, struct bio *bio)
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static int linear_map(struct dm_target *ti, struct bio *bio)
|
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{
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struct linear_c *lc = ti->private;
|
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|
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bio_set_dev(bio, lc->dev->bdev);
|
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if (bio_sectors(bio) || op_is_zone_mgmt(bio_op(bio)))
|
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bio->bi_iter.bi_sector =
|
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linear_map_sector(ti, bio->bi_iter.bi_sector);
|
||||
}
|
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|
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static int linear_map(struct dm_target *ti, struct bio *bio)
|
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{
|
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linear_map_bio(ti, bio);
|
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bio->bi_iter.bi_sector = linear_map_sector(ti, bio->bi_iter.bi_sector);
|
||||
|
||||
return DM_MAPIO_REMAPPED;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -105,6 +105,7 @@ struct multipath {
|
|||
struct dm_mpath_io {
|
||||
struct pgpath *pgpath;
|
||||
size_t nr_bytes;
|
||||
u64 start_time_ns;
|
||||
};
|
||||
|
||||
typedef int (*action_fn) (struct pgpath *pgpath);
|
||||
|
|
@ -295,6 +296,7 @@ static void multipath_init_per_bio_data(struct bio *bio, struct dm_mpath_io **mp
|
|||
|
||||
mpio->nr_bytes = bio->bi_iter.bi_size;
|
||||
mpio->pgpath = NULL;
|
||||
mpio->start_time_ns = 0;
|
||||
*mpio_p = mpio;
|
||||
|
||||
dm_bio_record(bio_details, bio);
|
||||
|
|
@ -647,6 +649,9 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio,
|
|||
|
||||
mpio->pgpath = pgpath;
|
||||
|
||||
if (dm_ps_use_hr_timer(pgpath->pg->ps.type))
|
||||
mpio->start_time_ns = ktime_get_ns();
|
||||
|
||||
bio->bi_status = 0;
|
||||
bio_set_dev(bio, pgpath->path.dev->bdev);
|
||||
bio->bi_opf |= REQ_FAILFAST_TRANSPORT;
|
||||
|
|
@ -1713,7 +1718,8 @@ done:
|
|||
|
||||
if (ps->type->end_io)
|
||||
ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes,
|
||||
dm_start_time_ns_from_clone(clone));
|
||||
(mpio->start_time_ns ?:
|
||||
dm_start_time_ns_from_clone(clone)));
|
||||
}
|
||||
|
||||
return r;
|
||||
|
|
|
|||
|
|
@ -26,11 +26,26 @@ struct path_selector {
|
|||
void *context;
|
||||
};
|
||||
|
||||
/*
|
||||
* If a path selector uses this flag, a high resolution timer is used
|
||||
* (via ktime_get_ns) to account for IO start time in BIO-based mpath.
|
||||
* This improves performance of some path selectors (i.e. HST), in
|
||||
* exchange for slightly higher overhead when submitting the BIO.
|
||||
* The extra cost is usually offset by improved path selection for
|
||||
* some benchmarks.
|
||||
*
|
||||
* This has no effect for request-based mpath, since it already uses a
|
||||
* higher precision timer by default.
|
||||
*/
|
||||
#define DM_PS_USE_HR_TIMER 0x00000001
|
||||
#define dm_ps_use_hr_timer(type) ((type)->features & DM_PS_USE_HR_TIMER)
|
||||
|
||||
/* Information about a path selector type */
|
||||
struct path_selector_type {
|
||||
char *name;
|
||||
struct module *module;
|
||||
|
||||
unsigned int features;
|
||||
unsigned int table_args;
|
||||
unsigned int info_args;
|
||||
|
||||
|
|
|
|||
|
|
@ -523,6 +523,7 @@ static int hst_end_io(struct path_selector *ps, struct dm_path *path,
|
|||
static struct path_selector_type hst_ps = {
|
||||
.name = "historical-service-time",
|
||||
.module = THIS_MODULE,
|
||||
.features = DM_PS_USE_HR_TIMER,
|
||||
.table_args = 1,
|
||||
.info_args = 3,
|
||||
.create = hst_create,
|
||||
|
|
|
|||
|
|
@ -225,6 +225,7 @@ void dm_stats_cleanup(struct dm_stats *stats)
|
|||
atomic_read(&shared->in_flight[READ]),
|
||||
atomic_read(&shared->in_flight[WRITE]));
|
||||
}
|
||||
cond_resched();
|
||||
}
|
||||
dm_stat_free(&s->rcu_head);
|
||||
}
|
||||
|
|
@ -330,6 +331,7 @@ static int dm_stats_create(struct dm_stats *stats, sector_t start, sector_t end,
|
|||
for (ni = 0; ni < n_entries; ni++) {
|
||||
atomic_set(&s->stat_shared[ni].in_flight[READ], 0);
|
||||
atomic_set(&s->stat_shared[ni].in_flight[WRITE], 0);
|
||||
cond_resched();
|
||||
}
|
||||
|
||||
if (s->n_histogram_entries) {
|
||||
|
|
@ -342,6 +344,7 @@ static int dm_stats_create(struct dm_stats *stats, sector_t start, sector_t end,
|
|||
for (ni = 0; ni < n_entries; ni++) {
|
||||
s->stat_shared[ni].tmp.histogram = hi;
|
||||
hi += s->n_histogram_entries + 1;
|
||||
cond_resched();
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -362,6 +365,7 @@ static int dm_stats_create(struct dm_stats *stats, sector_t start, sector_t end,
|
|||
for (ni = 0; ni < n_entries; ni++) {
|
||||
p[ni].histogram = hi;
|
||||
hi += s->n_histogram_entries + 1;
|
||||
cond_resched();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -396,6 +400,9 @@ static int dm_stats_create(struct dm_stats *stats, sector_t start, sector_t end,
|
|||
|
||||
dm_stats_recalc_precise_timestamps(stats);
|
||||
|
||||
if (!static_key_enabled(&stats_enabled.key))
|
||||
static_branch_enable(&stats_enabled);
|
||||
|
||||
mutex_unlock(&stats->mutex);
|
||||
|
||||
resume_callback(md);
|
||||
|
|
@ -497,6 +504,7 @@ static int dm_stats_list(struct dm_stats *stats, const char *program,
|
|||
}
|
||||
DMEMIT("\n");
|
||||
}
|
||||
cond_resched();
|
||||
}
|
||||
mutex_unlock(&stats->mutex);
|
||||
|
||||
|
|
@ -774,6 +782,7 @@ static void __dm_stat_clear(struct dm_stat *s, size_t idx_start, size_t idx_end,
|
|||
local_irq_enable();
|
||||
}
|
||||
}
|
||||
cond_resched();
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -889,6 +898,8 @@ static int dm_stats_print(struct dm_stats *stats, int id,
|
|||
|
||||
if (unlikely(sz + 1 >= maxlen))
|
||||
goto buffer_overflow;
|
||||
|
||||
cond_resched();
|
||||
}
|
||||
|
||||
if (clear)
|
||||
|
|
|
|||
|
|
@ -719,6 +719,9 @@ int dm_table_add_target(struct dm_table *t, const char *type,
|
|||
DMWARN("%s: %s: ignoring discards_supported because num_discard_bios is zero.",
|
||||
dm_device_name(t->md), type);
|
||||
|
||||
if (tgt->limit_swap_bios && !static_key_enabled(&swap_bios_enabled.key))
|
||||
static_branch_enable(&swap_bios_enabled);
|
||||
|
||||
return 0;
|
||||
|
||||
bad:
|
||||
|
|
@ -1002,6 +1005,8 @@ bool dm_table_request_based(struct dm_table *t)
|
|||
return __table_type_request_based(dm_table_get_type(t));
|
||||
}
|
||||
|
||||
static int dm_table_supports_poll(struct dm_table *t);
|
||||
|
||||
static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
|
||||
{
|
||||
enum dm_queue_mode type = dm_table_get_type(t);
|
||||
|
|
@ -1009,21 +1014,24 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
|
|||
unsigned min_pool_size = 0;
|
||||
struct dm_target *ti;
|
||||
unsigned i;
|
||||
bool poll_supported = false;
|
||||
|
||||
if (unlikely(type == DM_TYPE_NONE)) {
|
||||
DMWARN("no table type is set, can't allocate mempools");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (__table_type_bio_based(type))
|
||||
if (__table_type_bio_based(type)) {
|
||||
for (i = 0; i < t->num_targets; i++) {
|
||||
ti = t->targets + i;
|
||||
per_io_data_size = max(per_io_data_size, ti->per_io_data_size);
|
||||
min_pool_size = max(min_pool_size, ti->num_flush_bios);
|
||||
}
|
||||
poll_supported = !!dm_table_supports_poll(t);
|
||||
}
|
||||
|
||||
t->mempools = dm_alloc_md_mempools(md, type, t->integrity_supported,
|
||||
per_io_data_size, min_pool_size);
|
||||
t->mempools = dm_alloc_md_mempools(md, type, per_io_data_size, min_pool_size,
|
||||
t->integrity_supported, poll_supported);
|
||||
if (!t->mempools)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -2035,6 +2043,8 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
|
|||
r = dm_set_zones_restrictions(t, q);
|
||||
if (r)
|
||||
return r;
|
||||
if (!static_key_enabled(&zoned_enabled.key))
|
||||
static_branch_enable(&zoned_enabled);
|
||||
}
|
||||
|
||||
dm_update_crypto_profile(q, t);
|
||||
|
|
|
|||
|
|
@ -550,13 +550,6 @@ int dm_zone_map_bio(struct dm_target_io *tio)
|
|||
return DM_MAPIO_KILL;
|
||||
}
|
||||
|
||||
/*
|
||||
* The target map function may issue and complete the IO quickly.
|
||||
* Take an extra reference on the IO to make sure it does disappear
|
||||
* until we run dm_zone_map_bio_end().
|
||||
*/
|
||||
dm_io_inc_pending(io);
|
||||
|
||||
/* Let the target do its work */
|
||||
r = ti->type->map(ti, clone);
|
||||
switch (r) {
|
||||
|
|
@ -587,9 +580,6 @@ int dm_zone_map_bio(struct dm_target_io *tio)
|
|||
break;
|
||||
}
|
||||
|
||||
/* Drop the extra reference on the IO */
|
||||
dm_io_dec_pending(io, sts);
|
||||
|
||||
if (sts != BLK_STS_OK)
|
||||
return DM_MAPIO_KILL;
|
||||
|
||||
|
|
|
|||
558
drivers/md/dm.c
558
drivers/md/dm.c
|
|
@ -71,6 +71,10 @@ void dm_issue_global_event(void)
|
|||
wake_up(&dm_global_eventq);
|
||||
}
|
||||
|
||||
DEFINE_STATIC_KEY_FALSE(stats_enabled);
|
||||
DEFINE_STATIC_KEY_FALSE(swap_bios_enabled);
|
||||
DEFINE_STATIC_KEY_FALSE(zoned_enabled);
|
||||
|
||||
/*
|
||||
* One of these is allocated (on-stack) per original bio.
|
||||
*/
|
||||
|
|
@ -80,7 +84,8 @@ struct clone_info {
|
|||
struct dm_io *io;
|
||||
sector_t sector;
|
||||
unsigned sector_count;
|
||||
bool submit_as_polled;
|
||||
bool is_abnormal_io:1;
|
||||
bool submit_as_polled:1;
|
||||
};
|
||||
|
||||
#define DM_TARGET_IO_BIO_OFFSET (offsetof(struct dm_target_io, clone))
|
||||
|
|
@ -498,69 +503,76 @@ static bool bio_is_flush_with_data(struct bio *bio)
|
|||
return ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size);
|
||||
}
|
||||
|
||||
static void dm_io_acct(bool end, struct mapped_device *md, struct bio *bio,
|
||||
unsigned long start_time, struct dm_stats_aux *stats_aux)
|
||||
static void dm_io_acct(struct dm_io *io, bool end)
|
||||
{
|
||||
bool is_flush_with_data;
|
||||
unsigned int bi_size;
|
||||
struct dm_stats_aux *stats_aux = &io->stats_aux;
|
||||
unsigned long start_time = io->start_time;
|
||||
struct mapped_device *md = io->md;
|
||||
struct bio *bio = io->orig_bio;
|
||||
unsigned int sectors;
|
||||
|
||||
/* If REQ_PREFLUSH set save any payload but do not account it */
|
||||
is_flush_with_data = bio_is_flush_with_data(bio);
|
||||
if (is_flush_with_data) {
|
||||
bi_size = bio->bi_iter.bi_size;
|
||||
bio->bi_iter.bi_size = 0;
|
||||
}
|
||||
/*
|
||||
* If REQ_PREFLUSH set, don't account payload, it will be
|
||||
* submitted (and accounted) after this flush completes.
|
||||
*/
|
||||
if (bio_is_flush_with_data(bio))
|
||||
sectors = 0;
|
||||
else if (likely(!(dm_io_flagged(io, DM_IO_WAS_SPLIT))))
|
||||
sectors = bio_sectors(bio);
|
||||
else
|
||||
sectors = io->sectors;
|
||||
|
||||
if (!end)
|
||||
bio_start_io_acct_time(bio, start_time);
|
||||
bdev_start_io_acct(bio->bi_bdev, sectors, bio_op(bio),
|
||||
start_time);
|
||||
else
|
||||
bio_end_io_acct(bio, start_time);
|
||||
bdev_end_io_acct(bio->bi_bdev, bio_op(bio), start_time);
|
||||
|
||||
if (static_branch_unlikely(&stats_enabled) &&
|
||||
unlikely(dm_stats_used(&md->stats))) {
|
||||
sector_t sector;
|
||||
|
||||
if (likely(!dm_io_flagged(io, DM_IO_WAS_SPLIT)))
|
||||
sector = bio->bi_iter.bi_sector;
|
||||
else
|
||||
sector = bio_end_sector(bio) - io->sector_offset;
|
||||
|
||||
if (unlikely(dm_stats_used(&md->stats)))
|
||||
dm_stats_account_io(&md->stats, bio_data_dir(bio),
|
||||
bio->bi_iter.bi_sector, bio_sectors(bio),
|
||||
sector, sectors,
|
||||
end, start_time, stats_aux);
|
||||
|
||||
/* Restore bio's payload so it does get accounted upon requeue */
|
||||
if (is_flush_with_data)
|
||||
bio->bi_iter.bi_size = bi_size;
|
||||
}
|
||||
}
|
||||
|
||||
static void __dm_start_io_acct(struct dm_io *io, struct bio *bio)
|
||||
static void __dm_start_io_acct(struct dm_io *io)
|
||||
{
|
||||
dm_io_acct(false, io->md, bio, io->start_time, &io->stats_aux);
|
||||
dm_io_acct(io, false);
|
||||
}
|
||||
|
||||
static void dm_start_io_acct(struct dm_io *io, struct bio *clone)
|
||||
{
|
||||
/* Must account IO to DM device in terms of orig_bio */
|
||||
struct bio *bio = io->orig_bio;
|
||||
|
||||
/*
|
||||
* Ensure IO accounting is only ever started once.
|
||||
* Expect no possibility for race unless DM_TIO_IS_DUPLICATE_BIO.
|
||||
*/
|
||||
if (!clone ||
|
||||
likely(!dm_tio_flagged(clone_to_tio(clone), DM_TIO_IS_DUPLICATE_BIO))) {
|
||||
if (WARN_ON_ONCE(dm_io_flagged(io, DM_IO_ACCOUNTED)))
|
||||
return;
|
||||
if (dm_io_flagged(io, DM_IO_ACCOUNTED))
|
||||
return;
|
||||
|
||||
/* Expect no possibility for race unless DM_TIO_IS_DUPLICATE_BIO. */
|
||||
if (!clone || likely(dm_tio_is_normal(clone_to_tio(clone)))) {
|
||||
dm_io_set_flag(io, DM_IO_ACCOUNTED);
|
||||
} else {
|
||||
unsigned long flags;
|
||||
if (dm_io_flagged(io, DM_IO_ACCOUNTED))
|
||||
return;
|
||||
/* Can afford locking given DM_TIO_IS_DUPLICATE_BIO */
|
||||
spin_lock_irqsave(&io->lock, flags);
|
||||
dm_io_set_flag(io, DM_IO_ACCOUNTED);
|
||||
spin_unlock_irqrestore(&io->lock, flags);
|
||||
}
|
||||
|
||||
__dm_start_io_acct(io, bio);
|
||||
__dm_start_io_acct(io);
|
||||
}
|
||||
|
||||
static void dm_end_io_acct(struct dm_io *io, struct bio *bio)
|
||||
static void dm_end_io_acct(struct dm_io *io)
|
||||
{
|
||||
dm_io_acct(true, io->md, bio, io->start_time, &io->stats_aux);
|
||||
dm_io_acct(io, true);
|
||||
}
|
||||
|
||||
static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
|
||||
|
|
@ -569,7 +581,9 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
|
|||
struct dm_target_io *tio;
|
||||
struct bio *clone;
|
||||
|
||||
clone = bio_alloc_clone(bio->bi_bdev, bio, GFP_NOIO, &md->io_bs);
|
||||
clone = bio_alloc_clone(NULL, bio, GFP_NOIO, &md->io_bs);
|
||||
/* Set default bdev, but target must bio_set_dev() before issuing IO */
|
||||
clone->bi_bdev = md->disk->part0;
|
||||
|
||||
tio = clone_to_tio(clone);
|
||||
tio->flags = 0;
|
||||
|
|
@ -578,17 +592,19 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
|
|||
|
||||
io = container_of(tio, struct dm_io, tio);
|
||||
io->magic = DM_IO_MAGIC;
|
||||
io->status = 0;
|
||||
atomic_set(&io->io_count, 1);
|
||||
io->status = BLK_STS_OK;
|
||||
|
||||
/* one ref is for submission, the other is for completion */
|
||||
atomic_set(&io->io_count, 2);
|
||||
this_cpu_inc(*md->pending_io);
|
||||
io->orig_bio = NULL;
|
||||
io->orig_bio = bio;
|
||||
io->md = md;
|
||||
io->map_task = current;
|
||||
spin_lock_init(&io->lock);
|
||||
io->start_time = jiffies;
|
||||
io->flags = 0;
|
||||
|
||||
dm_stats_record_start(&md->stats, &io->stats_aux);
|
||||
if (static_branch_unlikely(&stats_enabled))
|
||||
dm_stats_record_start(&md->stats, &io->stats_aux);
|
||||
|
||||
return io;
|
||||
}
|
||||
|
|
@ -599,7 +615,7 @@ static void free_io(struct dm_io *io)
|
|||
}
|
||||
|
||||
static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
|
||||
unsigned target_bio_nr, unsigned *len, gfp_t gfp_mask)
|
||||
unsigned target_bio_nr, unsigned *len, gfp_t gfp_mask)
|
||||
{
|
||||
struct dm_target_io *tio;
|
||||
struct bio *clone;
|
||||
|
|
@ -610,10 +626,13 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
|
|||
/* alloc_io() already initialized embedded clone */
|
||||
clone = &tio->clone;
|
||||
} else {
|
||||
clone = bio_alloc_clone(ci->bio->bi_bdev, ci->bio,
|
||||
gfp_mask, &ci->io->md->bs);
|
||||
struct mapped_device *md = ci->io->md;
|
||||
|
||||
clone = bio_alloc_clone(NULL, ci->bio, gfp_mask, &md->bs);
|
||||
if (!clone)
|
||||
return NULL;
|
||||
/* Set default bdev, but target must bio_set_dev() before issuing IO */
|
||||
clone->bi_bdev = md->disk->part0;
|
||||
|
||||
/* REQ_DM_POLL_LIST shouldn't be inherited */
|
||||
clone->bi_opf &= ~REQ_DM_POLL_LIST;
|
||||
|
|
@ -663,14 +682,16 @@ static void queue_io(struct mapped_device *md, struct bio *bio)
|
|||
* function to access the md->map field, and make sure they call
|
||||
* dm_put_live_table() when finished.
|
||||
*/
|
||||
struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier)
|
||||
struct dm_table *dm_get_live_table(struct mapped_device *md,
|
||||
int *srcu_idx) __acquires(md->io_barrier)
|
||||
{
|
||||
*srcu_idx = srcu_read_lock(&md->io_barrier);
|
||||
|
||||
return srcu_dereference(md->map, &md->io_barrier);
|
||||
}
|
||||
|
||||
void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier)
|
||||
void dm_put_live_table(struct mapped_device *md,
|
||||
int srcu_idx) __releases(md->io_barrier)
|
||||
{
|
||||
srcu_read_unlock(&md->io_barrier, srcu_idx);
|
||||
}
|
||||
|
|
@ -696,6 +717,24 @@ static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU)
|
|||
rcu_read_unlock();
|
||||
}
|
||||
|
||||
static inline struct dm_table *dm_get_live_table_bio(struct mapped_device *md,
|
||||
int *srcu_idx, struct bio *bio)
|
||||
{
|
||||
if (bio->bi_opf & REQ_NOWAIT)
|
||||
return dm_get_live_table_fast(md);
|
||||
else
|
||||
return dm_get_live_table(md, srcu_idx);
|
||||
}
|
||||
|
||||
static inline void dm_put_live_table_bio(struct mapped_device *md, int srcu_idx,
|
||||
struct bio *bio)
|
||||
{
|
||||
if (bio->bi_opf & REQ_NOWAIT)
|
||||
dm_put_live_table_fast(md);
|
||||
else
|
||||
dm_put_live_table(md, srcu_idx);
|
||||
}
|
||||
|
||||
static char *_dm_claim_ptr = "I belong to device-mapper";
|
||||
|
||||
/*
|
||||
|
|
@ -875,14 +914,14 @@ static void dm_io_complete(struct dm_io *io)
|
|||
|
||||
io_error = io->status;
|
||||
if (dm_io_flagged(io, DM_IO_ACCOUNTED))
|
||||
dm_end_io_acct(io, bio);
|
||||
dm_end_io_acct(io);
|
||||
else if (!io_error) {
|
||||
/*
|
||||
* Must handle target that DM_MAPIO_SUBMITTED only to
|
||||
* then bio_endio() rather than dm_submit_bio_remap()
|
||||
*/
|
||||
__dm_start_io_acct(io, bio);
|
||||
dm_end_io_acct(io, bio);
|
||||
__dm_start_io_acct(io);
|
||||
dm_end_io_acct(io);
|
||||
}
|
||||
free_io(io);
|
||||
smp_wmb();
|
||||
|
|
@ -899,7 +938,7 @@ static void dm_io_complete(struct dm_io *io)
|
|||
* may only reflect a subset of the pre-split original)
|
||||
* so clear REQ_POLLED in case of requeue.
|
||||
*/
|
||||
bio->bi_opf &= ~REQ_POLLED;
|
||||
bio_clear_polled(bio);
|
||||
if (io_error == BLK_STS_AGAIN) {
|
||||
/* io_uring doesn't handle BLK_STS_AGAIN (yet) */
|
||||
queue_io(md, bio);
|
||||
|
|
@ -923,32 +962,37 @@ static void dm_io_complete(struct dm_io *io)
|
|||
}
|
||||
}
|
||||
|
||||
static inline bool dm_tio_is_normal(struct dm_target_io *tio)
|
||||
{
|
||||
return (dm_tio_flagged(tio, DM_TIO_INSIDE_DM_IO) &&
|
||||
!dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO));
|
||||
}
|
||||
|
||||
/*
|
||||
* Decrements the number of outstanding ios that a bio has been
|
||||
* cloned into, completing the original io if necc.
|
||||
*/
|
||||
void dm_io_dec_pending(struct dm_io *io, blk_status_t error)
|
||||
static inline void __dm_io_dec_pending(struct dm_io *io)
|
||||
{
|
||||
/* Push-back supersedes any I/O errors */
|
||||
if (unlikely(error)) {
|
||||
unsigned long flags;
|
||||
spin_lock_irqsave(&io->lock, flags);
|
||||
if (!(io->status == BLK_STS_DM_REQUEUE &&
|
||||
__noflush_suspending(io->md)))
|
||||
io->status = error;
|
||||
spin_unlock_irqrestore(&io->lock, flags);
|
||||
}
|
||||
|
||||
if (atomic_dec_and_test(&io->io_count))
|
||||
dm_io_complete(io);
|
||||
}
|
||||
|
||||
static void dm_io_set_error(struct dm_io *io, blk_status_t error)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
/* Push-back supersedes any I/O errors */
|
||||
spin_lock_irqsave(&io->lock, flags);
|
||||
if (!(io->status == BLK_STS_DM_REQUEUE &&
|
||||
__noflush_suspending(io->md))) {
|
||||
io->status = error;
|
||||
}
|
||||
spin_unlock_irqrestore(&io->lock, flags);
|
||||
}
|
||||
|
||||
static void dm_io_dec_pending(struct dm_io *io, blk_status_t error)
|
||||
{
|
||||
if (unlikely(error))
|
||||
dm_io_set_error(io, error);
|
||||
|
||||
__dm_io_dec_pending(io);
|
||||
}
|
||||
|
||||
void disable_discard(struct mapped_device *md)
|
||||
{
|
||||
struct queue_limits *limits = dm_get_queue_limits(md);
|
||||
|
|
@ -974,35 +1018,43 @@ static void clone_endio(struct bio *bio)
|
|||
{
|
||||
blk_status_t error = bio->bi_status;
|
||||
struct dm_target_io *tio = clone_to_tio(bio);
|
||||
struct dm_target *ti = tio->ti;
|
||||
dm_endio_fn endio = ti->type->end_io;
|
||||
struct dm_io *io = tio->io;
|
||||
struct mapped_device *md = tio->io->md;
|
||||
dm_endio_fn endio = tio->ti->type->end_io;
|
||||
struct request_queue *q = bio->bi_bdev->bd_disk->queue;
|
||||
struct mapped_device *md = io->md;
|
||||
|
||||
if (unlikely(error == BLK_STS_TARGET)) {
|
||||
if (bio_op(bio) == REQ_OP_DISCARD &&
|
||||
!bdev_max_discard_sectors(bio->bi_bdev))
|
||||
disable_discard(md);
|
||||
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
|
||||
!q->limits.max_write_zeroes_sectors)
|
||||
disable_write_zeroes(md);
|
||||
if (likely(bio->bi_bdev != md->disk->part0)) {
|
||||
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
|
||||
|
||||
if (unlikely(error == BLK_STS_TARGET)) {
|
||||
if (bio_op(bio) == REQ_OP_DISCARD &&
|
||||
!bdev_max_discard_sectors(bio->bi_bdev))
|
||||
disable_discard(md);
|
||||
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
|
||||
!q->limits.max_write_zeroes_sectors)
|
||||
disable_write_zeroes(md);
|
||||
}
|
||||
|
||||
if (static_branch_unlikely(&zoned_enabled) &&
|
||||
unlikely(blk_queue_is_zoned(q)))
|
||||
dm_zone_endio(io, bio);
|
||||
}
|
||||
|
||||
if (blk_queue_is_zoned(q))
|
||||
dm_zone_endio(io, bio);
|
||||
|
||||
if (endio) {
|
||||
int r = endio(tio->ti, bio, &error);
|
||||
int r = endio(ti, bio, &error);
|
||||
switch (r) {
|
||||
case DM_ENDIO_REQUEUE:
|
||||
/*
|
||||
* Requeuing writes to a sequential zone of a zoned
|
||||
* target will break the sequential write pattern:
|
||||
* fail such IO.
|
||||
*/
|
||||
if (WARN_ON_ONCE(dm_is_zone_write(md, bio)))
|
||||
error = BLK_STS_IOERR;
|
||||
else
|
||||
if (static_branch_unlikely(&zoned_enabled)) {
|
||||
/*
|
||||
* Requeuing writes to a sequential zone of a zoned
|
||||
* target will break the sequential write pattern:
|
||||
* fail such IO.
|
||||
*/
|
||||
if (WARN_ON_ONCE(dm_is_zone_write(md, bio)))
|
||||
error = BLK_STS_IOERR;
|
||||
else
|
||||
error = BLK_STS_DM_REQUEUE;
|
||||
} else
|
||||
error = BLK_STS_DM_REQUEUE;
|
||||
fallthrough;
|
||||
case DM_ENDIO_DONE:
|
||||
|
|
@ -1016,10 +1068,9 @@ static void clone_endio(struct bio *bio)
|
|||
}
|
||||
}
|
||||
|
||||
if (unlikely(swap_bios_limit(tio->ti, bio))) {
|
||||
struct mapped_device *md = io->md;
|
||||
if (static_branch_unlikely(&swap_bios_enabled) &&
|
||||
unlikely(swap_bios_limit(ti, bio)))
|
||||
up(&md->swap_bios_semaphore);
|
||||
}
|
||||
|
||||
free_tio(bio);
|
||||
dm_io_dec_pending(io, error);
|
||||
|
|
@ -1161,7 +1212,7 @@ static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
|
|||
* +--------------------+---------------+-------+
|
||||
*
|
||||
* <-------------- *tio->len_ptr --------------->
|
||||
* <------- bi_size ------->
|
||||
* <----- bio_sectors ----->
|
||||
* <-- n_sectors -->
|
||||
*
|
||||
* Region 1 was already iterated over with bio_advance or similar function.
|
||||
|
|
@ -1178,26 +1229,26 @@ static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
|
|||
void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
|
||||
{
|
||||
struct dm_target_io *tio = clone_to_tio(bio);
|
||||
unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT;
|
||||
unsigned bio_sectors = bio_sectors(bio);
|
||||
|
||||
BUG_ON(dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO));
|
||||
BUG_ON(op_is_zone_mgmt(bio_op(bio)));
|
||||
BUG_ON(bio_op(bio) == REQ_OP_ZONE_APPEND);
|
||||
BUG_ON(bi_size > *tio->len_ptr);
|
||||
BUG_ON(n_sectors > bi_size);
|
||||
BUG_ON(bio_sectors > *tio->len_ptr);
|
||||
BUG_ON(n_sectors > bio_sectors);
|
||||
|
||||
*tio->len_ptr -= bi_size - n_sectors;
|
||||
*tio->len_ptr -= bio_sectors - n_sectors;
|
||||
bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT;
|
||||
|
||||
/*
|
||||
* __split_and_process_bio() may have already saved mapped part
|
||||
* for accounting but it is being reduced so update accordingly.
|
||||
*/
|
||||
dm_io_set_flag(tio->io, DM_IO_WAS_SPLIT);
|
||||
tio->io->sectors = n_sectors;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
|
||||
|
||||
static inline void __dm_submit_bio_remap(struct bio *clone,
|
||||
dev_t dev, sector_t old_sector)
|
||||
{
|
||||
trace_block_bio_remap(clone, dev, old_sector);
|
||||
submit_bio_noacct(clone);
|
||||
}
|
||||
|
||||
/*
|
||||
* @clone: clone bio that DM core passed to target's .map function
|
||||
* @tgt_clone: clone of @clone bio that target needs submitted
|
||||
|
|
@ -1212,8 +1263,6 @@ void dm_submit_bio_remap(struct bio *clone, struct bio *tgt_clone)
|
|||
struct dm_target_io *tio = clone_to_tio(clone);
|
||||
struct dm_io *io = tio->io;
|
||||
|
||||
WARN_ON_ONCE(!tio->ti->accounts_remapped_io);
|
||||
|
||||
/* establish bio that will get submitted */
|
||||
if (!tgt_clone)
|
||||
tgt_clone = clone;
|
||||
|
|
@ -1222,22 +1271,11 @@ void dm_submit_bio_remap(struct bio *clone, struct bio *tgt_clone)
|
|||
* Account io->origin_bio to DM dev on behalf of target
|
||||
* that took ownership of IO with DM_MAPIO_SUBMITTED.
|
||||
*/
|
||||
if (io->map_task == current) {
|
||||
/* Still in target's map function */
|
||||
dm_io_set_flag(io, DM_IO_START_ACCT);
|
||||
} else {
|
||||
/*
|
||||
* Called by another thread, managed by DM target,
|
||||
* wait for dm_split_and_process_bio() to store
|
||||
* io->orig_bio
|
||||
*/
|
||||
while (unlikely(!smp_load_acquire(&io->orig_bio)))
|
||||
msleep(1);
|
||||
dm_start_io_acct(io, clone);
|
||||
}
|
||||
dm_start_io_acct(io, clone);
|
||||
|
||||
__dm_submit_bio_remap(tgt_clone, disk_devt(io->md->disk),
|
||||
trace_block_bio_remap(tgt_clone, disk_devt(io->md->disk),
|
||||
tio->old_sector);
|
||||
submit_bio_noacct(tgt_clone);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dm_submit_bio_remap);
|
||||
|
||||
|
|
@ -1260,55 +1298,53 @@ static noinline void __set_swap_bios_limit(struct mapped_device *md, int latch)
|
|||
static void __map_bio(struct bio *clone)
|
||||
{
|
||||
struct dm_target_io *tio = clone_to_tio(clone);
|
||||
int r;
|
||||
struct dm_io *io = tio->io;
|
||||
struct dm_target *ti = tio->ti;
|
||||
struct dm_io *io = tio->io;
|
||||
struct mapped_device *md = io->md;
|
||||
int r;
|
||||
|
||||
clone->bi_end_io = clone_endio;
|
||||
|
||||
/*
|
||||
* Map the clone.
|
||||
*/
|
||||
dm_io_inc_pending(io);
|
||||
tio->old_sector = clone->bi_iter.bi_sector;
|
||||
|
||||
if (unlikely(swap_bios_limit(ti, clone))) {
|
||||
struct mapped_device *md = io->md;
|
||||
if (static_branch_unlikely(&swap_bios_enabled) &&
|
||||
unlikely(swap_bios_limit(ti, clone))) {
|
||||
int latch = get_swap_bios();
|
||||
if (unlikely(latch != md->swap_bios))
|
||||
__set_swap_bios_limit(md, latch);
|
||||
down(&md->swap_bios_semaphore);
|
||||
}
|
||||
|
||||
/*
|
||||
* Check if the IO needs a special mapping due to zone append emulation
|
||||
* on zoned target. In this case, dm_zone_map_bio() calls the target
|
||||
* map operation.
|
||||
*/
|
||||
if (dm_emulate_zone_append(io->md))
|
||||
r = dm_zone_map_bio(tio);
|
||||
else
|
||||
if (static_branch_unlikely(&zoned_enabled)) {
|
||||
/*
|
||||
* Check if the IO needs a special mapping due to zone append
|
||||
* emulation on zoned target. In this case, dm_zone_map_bio()
|
||||
* calls the target map operation.
|
||||
*/
|
||||
if (unlikely(dm_emulate_zone_append(md)))
|
||||
r = dm_zone_map_bio(tio);
|
||||
else
|
||||
r = ti->type->map(ti, clone);
|
||||
} else
|
||||
r = ti->type->map(ti, clone);
|
||||
|
||||
switch (r) {
|
||||
case DM_MAPIO_SUBMITTED:
|
||||
/* target has assumed ownership of this io */
|
||||
if (!ti->accounts_remapped_io)
|
||||
dm_io_set_flag(io, DM_IO_START_ACCT);
|
||||
dm_start_io_acct(io, clone);
|
||||
break;
|
||||
case DM_MAPIO_REMAPPED:
|
||||
/*
|
||||
* the bio has been remapped so dispatch it, but defer
|
||||
* dm_start_io_acct() until after possible bio_split().
|
||||
*/
|
||||
__dm_submit_bio_remap(clone, disk_devt(io->md->disk),
|
||||
tio->old_sector);
|
||||
dm_io_set_flag(io, DM_IO_START_ACCT);
|
||||
dm_submit_bio_remap(clone, NULL);
|
||||
break;
|
||||
case DM_MAPIO_KILL:
|
||||
case DM_MAPIO_REQUEUE:
|
||||
if (unlikely(swap_bios_limit(ti, clone)))
|
||||
up(&io->md->swap_bios_semaphore);
|
||||
if (static_branch_unlikely(&swap_bios_enabled) &&
|
||||
unlikely(swap_bios_limit(ti, clone)))
|
||||
up(&md->swap_bios_semaphore);
|
||||
free_tio(clone);
|
||||
if (r == DM_MAPIO_KILL)
|
||||
dm_io_dec_pending(io, BLK_STS_IOERR);
|
||||
|
|
@ -1321,6 +1357,31 @@ static void __map_bio(struct bio *clone)
|
|||
}
|
||||
}
|
||||
|
||||
static void setup_split_accounting(struct clone_info *ci, unsigned len)
|
||||
{
|
||||
struct dm_io *io = ci->io;
|
||||
|
||||
if (ci->sector_count > len) {
|
||||
/*
|
||||
* Split needed, save the mapped part for accounting.
|
||||
* NOTE: dm_accept_partial_bio() will update accordingly.
|
||||
*/
|
||||
dm_io_set_flag(io, DM_IO_WAS_SPLIT);
|
||||
io->sectors = len;
|
||||
}
|
||||
|
||||
if (static_branch_unlikely(&stats_enabled) &&
|
||||
unlikely(dm_stats_used(&io->md->stats))) {
|
||||
/*
|
||||
* Save bi_sector in terms of its offset from end of
|
||||
* original bio, only needed for DM-stats' benefit.
|
||||
* - saved regardless of whether split needed so that
|
||||
* dm_accept_partial_bio() doesn't need to.
|
||||
*/
|
||||
io->sector_offset = bio_end_sector(ci->bio) - ci->sector;
|
||||
}
|
||||
}
|
||||
|
||||
static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci,
|
||||
struct dm_target *ti, unsigned num_bios)
|
||||
{
|
||||
|
|
@ -1350,18 +1411,22 @@ static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci,
|
|||
}
|
||||
}
|
||||
|
||||
static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
|
||||
static int __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
|
||||
unsigned num_bios, unsigned *len)
|
||||
{
|
||||
struct bio_list blist = BIO_EMPTY_LIST;
|
||||
struct bio *clone;
|
||||
int ret = 0;
|
||||
|
||||
switch (num_bios) {
|
||||
case 0:
|
||||
break;
|
||||
case 1:
|
||||
if (len)
|
||||
setup_split_accounting(ci, *len);
|
||||
clone = alloc_tio(ci, ti, 0, len, GFP_NOIO);
|
||||
__map_bio(clone);
|
||||
ret = 1;
|
||||
break;
|
||||
default:
|
||||
/* dm_accept_partial_bio() is not supported with shared tio->len_ptr */
|
||||
|
|
@ -1369,9 +1434,12 @@ static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
|
|||
while ((clone = bio_list_pop(&blist))) {
|
||||
dm_tio_set_flag(clone_to_tio(clone), DM_TIO_IS_DUPLICATE_BIO);
|
||||
__map_bio(clone);
|
||||
ret += 1;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __send_empty_flush(struct clone_info *ci)
|
||||
|
|
@ -1392,8 +1460,19 @@ static void __send_empty_flush(struct clone_info *ci)
|
|||
ci->sector_count = 0;
|
||||
ci->io->tio.clone.bi_iter.bi_size = 0;
|
||||
|
||||
while ((ti = dm_table_get_target(ci->map, target_nr++)))
|
||||
__send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL);
|
||||
while ((ti = dm_table_get_target(ci->map, target_nr++))) {
|
||||
int bios;
|
||||
|
||||
atomic_add(ti->num_flush_bios, &ci->io->io_count);
|
||||
bios = __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL);
|
||||
atomic_sub(ti->num_flush_bios - bios, &ci->io->io_count);
|
||||
}
|
||||
|
||||
/*
|
||||
* alloc_io() takes one extra reference for submission, so the
|
||||
* reference won't reach 0 without the following subtraction
|
||||
*/
|
||||
atomic_sub(1, &ci->io->io_count);
|
||||
|
||||
bio_uninit(ci->bio);
|
||||
}
|
||||
|
|
@ -1402,11 +1481,18 @@ static void __send_changing_extent_only(struct clone_info *ci, struct dm_target
|
|||
unsigned num_bios)
|
||||
{
|
||||
unsigned len;
|
||||
int bios;
|
||||
|
||||
len = min_t(sector_t, ci->sector_count,
|
||||
max_io_len_target_boundary(ti, dm_target_offset(ti, ci->sector)));
|
||||
|
||||
__send_duplicate_bios(ci, ti, num_bios, &len);
|
||||
atomic_add(num_bios, &ci->io->io_count);
|
||||
bios = __send_duplicate_bios(ci, ti, num_bios, &len);
|
||||
/*
|
||||
* alloc_io() takes one extra reference for submission, so the
|
||||
* reference won't reach 0 without the following (+1) subtraction
|
||||
*/
|
||||
atomic_sub(num_bios - bios + 1, &ci->io->io_count);
|
||||
|
||||
ci->sector += len;
|
||||
ci->sector_count -= len;
|
||||
|
|
@ -1414,21 +1500,24 @@ static void __send_changing_extent_only(struct clone_info *ci, struct dm_target
|
|||
|
||||
static bool is_abnormal_io(struct bio *bio)
|
||||
{
|
||||
bool r = false;
|
||||
unsigned int op = bio_op(bio);
|
||||
|
||||
switch (bio_op(bio)) {
|
||||
case REQ_OP_DISCARD:
|
||||
case REQ_OP_SECURE_ERASE:
|
||||
case REQ_OP_WRITE_ZEROES:
|
||||
r = true;
|
||||
break;
|
||||
if (op != REQ_OP_READ && op != REQ_OP_WRITE && op != REQ_OP_FLUSH) {
|
||||
switch (op) {
|
||||
case REQ_OP_DISCARD:
|
||||
case REQ_OP_SECURE_ERASE:
|
||||
case REQ_OP_WRITE_ZEROES:
|
||||
return true;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return r;
|
||||
return false;
|
||||
}
|
||||
|
||||
static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
|
||||
int *result)
|
||||
static blk_status_t __process_abnormal_io(struct clone_info *ci,
|
||||
struct dm_target *ti)
|
||||
{
|
||||
unsigned num_bios = 0;
|
||||
|
||||
|
|
@ -1442,8 +1531,6 @@ static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
|
|||
case REQ_OP_WRITE_ZEROES:
|
||||
num_bios = ti->num_write_zeroes_bios;
|
||||
break;
|
||||
default:
|
||||
return false;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1452,17 +1539,15 @@ static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
|
|||
* reconfiguration might also have changed that since the
|
||||
* check was performed.
|
||||
*/
|
||||
if (!num_bios)
|
||||
*result = -EOPNOTSUPP;
|
||||
else {
|
||||
__send_changing_extent_only(ci, ti, num_bios);
|
||||
*result = 0;
|
||||
}
|
||||
return true;
|
||||
if (unlikely(!num_bios))
|
||||
return BLK_STS_NOTSUPP;
|
||||
|
||||
__send_changing_extent_only(ci, ti, num_bios);
|
||||
return BLK_STS_OK;
|
||||
}
|
||||
|
||||
/*
|
||||
* Reuse ->bi_private as hlist head for storing all dm_io instances
|
||||
* Reuse ->bi_private as dm_io list head for storing all dm_io instances
|
||||
* associated with this bio, and this bio's bi_private needs to be
|
||||
* stored in dm_io->data before the reuse.
|
||||
*
|
||||
|
|
@ -1470,54 +1555,53 @@ static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
|
|||
* touch it after splitting. Meantime it won't be changed by anyone after
|
||||
* bio is submitted. So this reuse is safe.
|
||||
*/
|
||||
static inline struct hlist_head *dm_get_bio_hlist_head(struct bio *bio)
|
||||
static inline struct dm_io **dm_poll_list_head(struct bio *bio)
|
||||
{
|
||||
return (struct hlist_head *)&bio->bi_private;
|
||||
return (struct dm_io **)&bio->bi_private;
|
||||
}
|
||||
|
||||
static void dm_queue_poll_io(struct bio *bio, struct dm_io *io)
|
||||
{
|
||||
struct hlist_head *head = dm_get_bio_hlist_head(bio);
|
||||
struct dm_io **head = dm_poll_list_head(bio);
|
||||
|
||||
if (!(bio->bi_opf & REQ_DM_POLL_LIST)) {
|
||||
bio->bi_opf |= REQ_DM_POLL_LIST;
|
||||
/*
|
||||
* Save .bi_private into dm_io, so that we can reuse
|
||||
* .bi_private as hlist head for storing dm_io list
|
||||
* .bi_private as dm_io list head for storing dm_io list
|
||||
*/
|
||||
io->data = bio->bi_private;
|
||||
|
||||
INIT_HLIST_HEAD(head);
|
||||
|
||||
/* tell block layer to poll for completion */
|
||||
bio->bi_cookie = ~BLK_QC_T_NONE;
|
||||
|
||||
io->next = NULL;
|
||||
} else {
|
||||
/*
|
||||
* bio recursed due to split, reuse original poll list,
|
||||
* and save bio->bi_private too.
|
||||
*/
|
||||
io->data = hlist_entry(head->first, struct dm_io, node)->data;
|
||||
io->data = (*head)->data;
|
||||
io->next = *head;
|
||||
}
|
||||
|
||||
hlist_add_head(&io->node, head);
|
||||
*head = io;
|
||||
}
|
||||
|
||||
/*
|
||||
* Select the correct strategy for processing a non-flush bio.
|
||||
*/
|
||||
static int __split_and_process_bio(struct clone_info *ci)
|
||||
static blk_status_t __split_and_process_bio(struct clone_info *ci)
|
||||
{
|
||||
struct bio *clone;
|
||||
struct dm_target *ti;
|
||||
unsigned len;
|
||||
int r;
|
||||
|
||||
ti = dm_table_find_target(ci->map, ci->sector);
|
||||
if (!ti)
|
||||
return -EIO;
|
||||
|
||||
if (__process_abnormal_io(ci, ti, &r))
|
||||
return r;
|
||||
if (unlikely(!ti))
|
||||
return BLK_STS_IOERR;
|
||||
else if (unlikely(ci->is_abnormal_io))
|
||||
return __process_abnormal_io(ci, ti);
|
||||
|
||||
/*
|
||||
* Only support bio polling for normal IO, and the target io is
|
||||
|
|
@ -1526,27 +1610,30 @@ static int __split_and_process_bio(struct clone_info *ci)
|
|||
ci->submit_as_polled = ci->bio->bi_opf & REQ_POLLED;
|
||||
|
||||
len = min_t(sector_t, max_io_len(ti, ci->sector), ci->sector_count);
|
||||
setup_split_accounting(ci, len);
|
||||
clone = alloc_tio(ci, ti, 0, &len, GFP_NOIO);
|
||||
__map_bio(clone);
|
||||
|
||||
ci->sector += len;
|
||||
ci->sector_count -= len;
|
||||
|
||||
return 0;
|
||||
return BLK_STS_OK;
|
||||
}
|
||||
|
||||
static void init_clone_info(struct clone_info *ci, struct mapped_device *md,
|
||||
struct dm_table *map, struct bio *bio)
|
||||
struct dm_table *map, struct bio *bio, bool is_abnormal)
|
||||
{
|
||||
ci->map = map;
|
||||
ci->io = alloc_io(md, bio);
|
||||
ci->bio = bio;
|
||||
ci->is_abnormal_io = is_abnormal;
|
||||
ci->submit_as_polled = false;
|
||||
ci->sector = bio->bi_iter.bi_sector;
|
||||
ci->sector_count = bio_sectors(bio);
|
||||
|
||||
/* Shouldn't happen but sector_count was being set to 0 so... */
|
||||
if (WARN_ON_ONCE(op_is_zone_mgmt(bio_op(bio)) && ci->sector_count))
|
||||
if (static_branch_unlikely(&zoned_enabled) &&
|
||||
WARN_ON_ONCE(op_is_zone_mgmt(bio_op(bio)) && ci->sector_count))
|
||||
ci->sector_count = 0;
|
||||
}
|
||||
|
||||
|
|
@ -1557,10 +1644,21 @@ static void dm_split_and_process_bio(struct mapped_device *md,
|
|||
struct dm_table *map, struct bio *bio)
|
||||
{
|
||||
struct clone_info ci;
|
||||
struct bio *orig_bio = NULL;
|
||||
int error = 0;
|
||||
struct dm_io *io;
|
||||
blk_status_t error = BLK_STS_OK;
|
||||
bool is_abnormal;
|
||||
|
||||
init_clone_info(&ci, md, map, bio);
|
||||
is_abnormal = is_abnormal_io(bio);
|
||||
if (unlikely(is_abnormal)) {
|
||||
/*
|
||||
* Use blk_queue_split() for abnormal IO (e.g. discard, etc)
|
||||
* otherwise associated queue_limits won't be imposed.
|
||||
*/
|
||||
blk_queue_split(&bio);
|
||||
}
|
||||
|
||||
init_clone_info(&ci, md, map, bio, is_abnormal);
|
||||
io = ci.io;
|
||||
|
||||
if (bio->bi_opf & REQ_PREFLUSH) {
|
||||
__send_empty_flush(&ci);
|
||||
|
|
@ -1569,40 +1667,34 @@ static void dm_split_and_process_bio(struct mapped_device *md,
|
|||
}
|
||||
|
||||
error = __split_and_process_bio(&ci);
|
||||
ci.io->map_task = NULL;
|
||||
if (error || !ci.sector_count)
|
||||
goto out;
|
||||
|
||||
/*
|
||||
* Remainder must be passed to submit_bio_noacct() so it gets handled
|
||||
* *after* bios already submitted have been completely processed.
|
||||
* We take a clone of the original to store in ci.io->orig_bio to be
|
||||
* used by dm_end_io_acct() and for dm_io_complete() to use for
|
||||
* completion handling.
|
||||
*/
|
||||
orig_bio = bio_split(bio, bio_sectors(bio) - ci.sector_count,
|
||||
GFP_NOIO, &md->queue->bio_split);
|
||||
bio_chain(orig_bio, bio);
|
||||
trace_block_split(orig_bio, bio->bi_iter.bi_sector);
|
||||
bio_trim(bio, io->sectors, ci.sector_count);
|
||||
trace_block_split(bio, bio->bi_iter.bi_sector);
|
||||
bio_inc_remaining(bio);
|
||||
submit_bio_noacct(bio);
|
||||
out:
|
||||
if (!orig_bio)
|
||||
orig_bio = bio;
|
||||
smp_store_release(&ci.io->orig_bio, orig_bio);
|
||||
if (dm_io_flagged(ci.io, DM_IO_START_ACCT))
|
||||
dm_start_io_acct(ci.io, NULL);
|
||||
|
||||
/*
|
||||
* Drop the extra reference count for non-POLLED bio, and hold one
|
||||
* reference for POLLED bio, which will be released in dm_poll_bio
|
||||
*
|
||||
* Add every dm_io instance into the hlist_head which is stored in
|
||||
* bio->bi_private, so that dm_poll_bio can poll them all.
|
||||
* Add every dm_io instance into the dm_io list head which is stored
|
||||
* in bio->bi_private, so that dm_poll_bio can poll them all.
|
||||
*/
|
||||
if (error || !ci.submit_as_polled)
|
||||
dm_io_dec_pending(ci.io, errno_to_blk_status(error));
|
||||
else
|
||||
dm_queue_poll_io(bio, ci.io);
|
||||
if (error || !ci.submit_as_polled) {
|
||||
/*
|
||||
* In case of submission failure, the extra reference for
|
||||
* submitting io isn't consumed yet
|
||||
*/
|
||||
if (error)
|
||||
atomic_dec(&io->io_count);
|
||||
dm_io_dec_pending(io, error);
|
||||
} else
|
||||
dm_queue_poll_io(bio, io);
|
||||
}
|
||||
|
||||
static void dm_submit_bio(struct bio *bio)
|
||||
|
|
@ -1611,7 +1703,7 @@ static void dm_submit_bio(struct bio *bio)
|
|||
int srcu_idx;
|
||||
struct dm_table *map;
|
||||
|
||||
map = dm_get_live_table(md, &srcu_idx);
|
||||
map = dm_get_live_table_bio(md, &srcu_idx, bio);
|
||||
|
||||
/* If suspended, or map not yet available, queue this IO for later */
|
||||
if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) ||
|
||||
|
|
@ -1625,16 +1717,9 @@ static void dm_submit_bio(struct bio *bio)
|
|||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* Use blk_queue_split() for abnormal IO (e.g. discard, writesame, etc)
|
||||
* otherwise associated queue_limits won't be imposed.
|
||||
*/
|
||||
if (is_abnormal_io(bio))
|
||||
blk_queue_split(&bio);
|
||||
|
||||
dm_split_and_process_bio(md, map, bio);
|
||||
out:
|
||||
dm_put_live_table(md, srcu_idx);
|
||||
dm_put_live_table_bio(md, srcu_idx, bio);
|
||||
}
|
||||
|
||||
static bool dm_poll_dm_io(struct dm_io *io, struct io_comp_batch *iob,
|
||||
|
|
@ -1653,18 +1738,16 @@ static bool dm_poll_dm_io(struct dm_io *io, struct io_comp_batch *iob,
|
|||
static int dm_poll_bio(struct bio *bio, struct io_comp_batch *iob,
|
||||
unsigned int flags)
|
||||
{
|
||||
struct hlist_head *head = dm_get_bio_hlist_head(bio);
|
||||
struct hlist_head tmp = HLIST_HEAD_INIT;
|
||||
struct hlist_node *next;
|
||||
struct dm_io *io;
|
||||
struct dm_io **head = dm_poll_list_head(bio);
|
||||
struct dm_io *list = *head;
|
||||
struct dm_io *tmp = NULL;
|
||||
struct dm_io *curr, *next;
|
||||
|
||||
/* Only poll normal bio which was marked as REQ_DM_POLL_LIST */
|
||||
if (!(bio->bi_opf & REQ_DM_POLL_LIST))
|
||||
return 0;
|
||||
|
||||
WARN_ON_ONCE(hlist_empty(head));
|
||||
|
||||
hlist_move_list(head, &tmp);
|
||||
WARN_ON_ONCE(!list);
|
||||
|
||||
/*
|
||||
* Restore .bi_private before possibly completing dm_io.
|
||||
|
|
@ -1675,24 +1758,27 @@ static int dm_poll_bio(struct bio *bio, struct io_comp_batch *iob,
|
|||
* clearing REQ_DM_POLL_LIST here.
|
||||
*/
|
||||
bio->bi_opf &= ~REQ_DM_POLL_LIST;
|
||||
bio->bi_private = hlist_entry(tmp.first, struct dm_io, node)->data;
|
||||
bio->bi_private = list->data;
|
||||
|
||||
hlist_for_each_entry_safe(io, next, &tmp, node) {
|
||||
if (dm_poll_dm_io(io, iob, flags)) {
|
||||
hlist_del_init(&io->node);
|
||||
for (curr = list, next = curr->next; curr; curr = next, next =
|
||||
curr ? curr->next : NULL) {
|
||||
if (dm_poll_dm_io(curr, iob, flags)) {
|
||||
/*
|
||||
* clone_endio() has already occurred, so passing
|
||||
* error as 0 here doesn't override io->status
|
||||
* clone_endio() has already occurred, so no
|
||||
* error handling is needed here.
|
||||
*/
|
||||
dm_io_dec_pending(io, 0);
|
||||
__dm_io_dec_pending(curr);
|
||||
} else {
|
||||
curr->next = tmp;
|
||||
tmp = curr;
|
||||
}
|
||||
}
|
||||
|
||||
/* Not done? */
|
||||
if (!hlist_empty(&tmp)) {
|
||||
if (tmp) {
|
||||
bio->bi_opf |= REQ_DM_POLL_LIST;
|
||||
/* Reset bio->bi_private to dm_io list head */
|
||||
hlist_move_list(&tmp, head);
|
||||
*head = tmp;
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
|
|
@ -2901,8 +2987,8 @@ int dm_noflush_suspending(struct dm_target *ti)
|
|||
EXPORT_SYMBOL_GPL(dm_noflush_suspending);
|
||||
|
||||
struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
|
||||
unsigned integrity, unsigned per_io_data_size,
|
||||
unsigned min_pool_size)
|
||||
unsigned per_io_data_size, unsigned min_pool_size,
|
||||
bool integrity, bool poll)
|
||||
{
|
||||
struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id);
|
||||
unsigned int pool_size = 0;
|
||||
|
|
@ -2918,7 +3004,7 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_qu
|
|||
pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
|
||||
front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET;
|
||||
io_front_pad = roundup(per_io_data_size, __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET;
|
||||
ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0);
|
||||
ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, poll ? BIOSET_PERCPU_CACHE : 0);
|
||||
if (ret)
|
||||
goto out;
|
||||
if (integrity && bioset_integrity_create(&pools->io_bs, pool_size))
|
||||
|
|
|
|||
|
|
@ -221,8 +221,8 @@ void dm_kcopyd_exit(void);
|
|||
* Mempool operations
|
||||
*/
|
||||
struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
|
||||
unsigned integrity, unsigned per_bio_data_size,
|
||||
unsigned min_pool_size);
|
||||
unsigned per_io_data_size, unsigned min_pool_size,
|
||||
bool integrity, bool poll);
|
||||
void dm_free_md_mempools(struct dm_md_mempools *pools);
|
||||
|
||||
/*
|
||||
|
|
|
|||
Loading…
Reference in New Issue