diff options
Diffstat (limited to 'drivers/md/dm-stripe.c')
| -rw-r--r-- | drivers/md/dm-stripe.c | 83 |
1 files changed, 46 insertions, 37 deletions
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 35c94ff24ad5..9e8f4cc63d6c 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -26,14 +26,12 @@ struct stripe { struct stripe_c { uint32_t stripes; int stripes_shift; - sector_t stripes_mask; /* The size of this target / num. stripes */ sector_t stripe_width; - /* stripe chunk size */ - uint32_t chunk_shift; - sector_t chunk_mask; + uint32_t chunk_size; + int chunk_size_shift; /* Needed for handling events */ struct dm_target *ti; @@ -91,7 +89,7 @@ static int get_stripe(struct dm_target *ti, struct stripe_c *sc, /* * Construct a striped mapping. - * <number of stripes> <chunk size (2^^n)> [<dev_path> <offset>]+ + * <number of stripes> <chunk size> [<dev_path> <offset>]+ */ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) { @@ -99,7 +97,6 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) sector_t width; uint32_t stripes; uint32_t chunk_size; - char *end; int r; unsigned int i; @@ -108,34 +105,23 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) return -EINVAL; } - stripes = simple_strtoul(argv[0], &end, 10); - if (!stripes || *end) { + if (kstrtouint(argv[0], 10, &stripes) || !stripes) { ti->error = "Invalid stripe count"; return -EINVAL; } - chunk_size = simple_strtoul(argv[1], &end, 10); - if (*end) { + if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) { ti->error = "Invalid chunk_size"; return -EINVAL; } - /* - * chunk_size is a power of two - */ - if (!is_power_of_2(chunk_size) || - (chunk_size < (PAGE_SIZE >> SECTOR_SHIFT))) { - ti->error = "Invalid chunk size"; - return -EINVAL; - } - - if (ti->len & (chunk_size - 1)) { + width = ti->len; + if (sector_div(width, chunk_size)) { ti->error = "Target length not divisible by " "chunk size"; return -EINVAL; } - width = ti->len; if (sector_div(width, stripes)) { ti->error = "Target length not divisible by " "number of stripes"; @@ -167,17 +153,21 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) if (stripes & (stripes - 1)) sc->stripes_shift = -1; - else { - sc->stripes_shift = ffs(stripes) - 1; - sc->stripes_mask = ((sector_t) stripes) - 1; - } + else + sc->stripes_shift = __ffs(stripes); + + r = dm_set_target_max_io_len(ti, chunk_size); + if (r) + return r; - ti->split_io = chunk_size; ti->num_flush_requests = stripes; ti->num_discard_requests = stripes; - sc->chunk_shift = ffs(chunk_size) - 1; - sc->chunk_mask = ((sector_t) chunk_size) - 1; + sc->chunk_size = chunk_size; + if (chunk_size & (chunk_size - 1)) + sc->chunk_size_shift = -1; + else + sc->chunk_size_shift = __ffs(chunk_size); /* * Get the stripe destinations. @@ -216,17 +206,29 @@ static void stripe_dtr(struct dm_target *ti) static void stripe_map_sector(struct stripe_c *sc, sector_t sector, uint32_t *stripe, sector_t *result) { - sector_t offset = dm_target_offset(sc->ti, sector); - sector_t chunk = offset >> sc->chunk_shift; + sector_t chunk = dm_target_offset(sc->ti, sector); + sector_t chunk_offset; + + if (sc->chunk_size_shift < 0) + chunk_offset = sector_div(chunk, sc->chunk_size); + else { + chunk_offset = chunk & (sc->chunk_size - 1); + chunk >>= sc->chunk_size_shift; + } if (sc->stripes_shift < 0) *stripe = sector_div(chunk, sc->stripes); else { - *stripe = chunk & sc->stripes_mask; + *stripe = chunk & (sc->stripes - 1); chunk >>= sc->stripes_shift; } - *result = (chunk << sc->chunk_shift) | (offset & sc->chunk_mask); + if (sc->chunk_size_shift < 0) + chunk *= sc->chunk_size; + else + chunk <<= sc->chunk_size_shift; + + *result = chunk + chunk_offset; } static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector, @@ -237,9 +239,16 @@ static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector, stripe_map_sector(sc, sector, &stripe, result); if (stripe == target_stripe) return; - *result &= ~sc->chunk_mask; /* round down */ + + /* round down */ + sector = *result; + if (sc->chunk_size_shift < 0) + *result -= sector_div(sector, sc->chunk_size); + else + *result = sector & ~(sector_t)(sc->chunk_size - 1); + if (target_stripe < stripe) - *result += sc->chunk_mask + 1; /* next chunk */ + *result += sc->chunk_size; /* next chunk */ } static int stripe_map_discard(struct stripe_c *sc, struct bio *bio, @@ -324,7 +333,7 @@ static int stripe_status(struct dm_target *ti, case STATUSTYPE_TABLE: DMEMIT("%d %llu", sc->stripes, - (unsigned long long)sc->chunk_mask + 1); + (unsigned long long)sc->chunk_size); for (i = 0; i < sc->stripes; i++) DMEMIT(" %s %llu", sc->stripe[i].dev->name, (unsigned long long)sc->stripe[i].physical_start); @@ -391,7 +400,7 @@ static void stripe_io_hints(struct dm_target *ti, struct queue_limits *limits) { struct stripe_c *sc = ti->private; - unsigned chunk_size = (sc->chunk_mask + 1) << 9; + unsigned chunk_size = sc->chunk_size << SECTOR_SHIFT; blk_limits_io_min(limits, chunk_size); blk_limits_io_opt(limits, chunk_size * sc->stripes); @@ -419,7 +428,7 @@ static int stripe_merge(struct dm_target *ti, struct bvec_merge_data *bvm, static struct target_type stripe_target = { .name = "striped", - .version = {1, 4, 0}, + .version = {1, 5, 0}, .module = THIS_MODULE, .ctr = stripe_ctr, .dtr = stripe_dtr, |