diff options
Diffstat (limited to 'drivers/md/dm-era-target.c')
| -rw-r--r-- | drivers/md/dm-era-target.c | 58 |
1 files changed, 38 insertions, 20 deletions
diff --git a/drivers/md/dm-era-target.c b/drivers/md/dm-era-target.c index a96290103cca..c4fd79135794 100644 --- a/drivers/md/dm-era-target.c +++ b/drivers/md/dm-era-target.c @@ -22,9 +22,11 @@ #define INVALID_WRITESET_ROOT SUPERBLOCK_LOCATION #define MIN_BLOCK_SIZE 8 -/*---------------------------------------------------------------- +/* + *-------------------------------------------------------------- * Writeset - *--------------------------------------------------------------*/ + *-------------------------------------------------------------- + */ struct writeset_metadata { uint32_t nr_bits; dm_block_t root; @@ -148,9 +150,11 @@ static int writeset_test_and_set(struct dm_disk_bitset *info, return 1; } -/*---------------------------------------------------------------- +/* + *-------------------------------------------------------------- * On disk metadata layout - *--------------------------------------------------------------*/ + *-------------------------------------------------------------- + */ #define SPACE_MAP_ROOT_SIZE 128 #define UUID_LEN 16 @@ -186,9 +190,11 @@ struct superblock_disk { __le64 metadata_snap; } __packed; -/*---------------------------------------------------------------- +/* + *-------------------------------------------------------------- * Superblock validation - *--------------------------------------------------------------*/ + *-------------------------------------------------------------- + */ static void sb_prepare_for_write(struct dm_block_validator *v, struct dm_block *b, size_t sb_block_size) @@ -252,9 +258,11 @@ static struct dm_block_validator sb_validator = { .check = sb_check }; -/*---------------------------------------------------------------- +/* + *-------------------------------------------------------------- * Low level metadata handling - *--------------------------------------------------------------*/ + *-------------------------------------------------------------- + */ #define DM_ERA_METADATA_BLOCK_SIZE 4096 #define ERA_MAX_CONCURRENT_LOCKS 5 @@ -658,13 +666,15 @@ static void swap_writeset(struct era_metadata *md, struct writeset *new_writeset synchronize_rcu(); } -/*---------------------------------------------------------------- +/* + *------------------------------------------------------------------------ * Writesets get 'digested' into the main era array. * * We're using a coroutine here so the worker thread can do the digestion, * thus avoiding synchronisation of the metadata. Digesting a whole * writeset in one go would cause too much latency. - *--------------------------------------------------------------*/ + *------------------------------------------------------------------------ + */ struct digest { uint32_t era; unsigned int nr_bits, current_bit; @@ -784,10 +794,12 @@ static int metadata_digest_start(struct era_metadata *md, struct digest *d) return 0; } -/*---------------------------------------------------------------- - * High level metadata interface. Target methods should use these, and not - * the lower level ones. - *--------------------------------------------------------------*/ +/* + *----------------------------------------------------------------- + * High level metadata interface. Target methods should use these, + * and not the lower level ones. + *----------------------------------------------------------------- + */ static struct era_metadata *metadata_open(struct block_device *bdev, sector_t block_size, bool may_format) @@ -1189,9 +1201,11 @@ struct rpc { struct completion complete; }; -/*---------------------------------------------------------------- +/* + *--------------------------------------------------------------- * Remapping. - *---------------------------------------------------------------*/ + *--------------------------------------------------------------- + */ static bool block_size_is_power_of_two(struct era *era) { return era->sectors_per_block_shift >= 0; @@ -1214,9 +1228,11 @@ static void remap_to_origin(struct era *era, struct bio *bio) bio_set_dev(bio, era->origin_dev->bdev); } -/*---------------------------------------------------------------- +/* + *-------------------------------------------------------------- * Worker thread - *--------------------------------------------------------------*/ + *-------------------------------------------------------------- + */ static void wake_worker(struct era *era) { if (!atomic_read(&era->suspended)) @@ -1403,9 +1419,11 @@ static void stop_worker(struct era *era) drain_workqueue(era->wq); } -/*---------------------------------------------------------------- +/* + *-------------------------------------------------------------- * Target methods - *--------------------------------------------------------------*/ + *-------------------------------------------------------------- + */ static void era_destroy(struct era *era) { if (era->md) |