Add a module option 'rd_logical_blksize' to allow the user to change the logical sector size of the RAM disks. Signed-off-by: Hannes Reinecke <hare@xxxxxxx> --- drivers/block/brd.c | 37 +++++++++++++++++++++++-------------- 1 file changed, 23 insertions(+), 14 deletions(-) diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 1ed114cd5cb0..dda791805aba 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -48,6 +48,8 @@ struct brd_device { u64 brd_nr_folios; unsigned int brd_sector_shift; unsigned int brd_sector_size; + unsigned int brd_logical_sector_shift; + unsigned int brd_logical_sector_size; }; /* @@ -57,7 +59,7 @@ static struct folio *brd_lookup_folio(struct brd_device *brd, sector_t sector) { pgoff_t idx; struct folio *folio; - unsigned int rd_sector_shift = brd->brd_sector_shift - SECTOR_SHIFT; + unsigned int rd_sector_shift = brd->brd_sector_shift - brd->brd_logical_sector_shift; /* * The folio lifetime is protected by the fact that we have opened the @@ -87,7 +89,7 @@ static int brd_insert_folio(struct brd_device *brd, sector_t sector, gfp_t gfp) { pgoff_t idx; struct folio *folio; - unsigned int rd_sector_shift = brd->brd_sector_shift - SECTOR_SHIFT; + unsigned int rd_sector_shift = brd->brd_sector_shift - brd->brd_logical_sector_shift; unsigned int rd_sector_order = get_order(brd->brd_sector_size); int ret = 0; @@ -172,10 +174,10 @@ static void brd_free_folios(struct brd_device *brd) static int copy_to_brd_setup(struct brd_device *brd, sector_t sector, size_t n, gfp_t gfp) { - unsigned int rd_sectors_shift = brd->brd_sector_shift - SECTOR_SHIFT; + unsigned int rd_sectors_shift = brd->brd_sector_shift - brd->brd_logical_sector_shift; unsigned int rd_sectors = 1 << rd_sectors_shift; unsigned int rd_sector_size = brd->brd_sector_size; - unsigned int offset = (sector & (rd_sectors - 1)) << SECTOR_SHIFT; + unsigned int offset = (sector & (rd_sectors - 1)) << brd->brd_logical_sector_shift; size_t copy; int ret; @@ -184,7 +186,7 @@ static int copy_to_brd_setup(struct brd_device *brd, sector_t sector, size_t n, if (ret) return ret; if (copy < n) { - sector += copy >> SECTOR_SHIFT; + sector += copy >> brd->brd_logical_sector_shift; ret = brd_insert_folio(brd, sector, gfp); } return ret; @@ -198,10 +200,10 @@ static void copy_to_brd(struct brd_device *brd, const void *src, { struct folio *folio; void *dst; - unsigned int rd_sectors_shift = brd->brd_sector_shift - SECTOR_SHIFT; + unsigned int rd_sectors_shift = brd->brd_sector_shift - brd->brd_logical_sector_shift; unsigned int rd_sectors = 1 << rd_sectors_shift; unsigned int rd_sector_size = brd->brd_sector_size; - unsigned int offset = (sector & (rd_sectors - 1)) << SECTOR_SHIFT; + unsigned int offset = (sector & (rd_sectors - 1)) << brd->brd_logical_sector_shift; size_t copy; copy = min_t(size_t, n, rd_sector_size - offset); @@ -214,7 +216,7 @@ static void copy_to_brd(struct brd_device *brd, const void *src, if (copy < n) { src += copy; - sector += copy >> SECTOR_SHIFT; + sector += copy >> brd->brd_logical_sector_shift; copy = n - copy; folio = brd_lookup_folio(brd, sector); BUG_ON(!folio); @@ -233,10 +235,10 @@ static void copy_from_brd(void *dst, struct brd_device *brd, { struct folio *folio; void *src; - unsigned int rd_sectors_shift = brd->brd_sector_shift - SECTOR_SHIFT; + unsigned int rd_sectors_shift = brd->brd_sector_shift - brd->brd_logical_sector_shift; unsigned int rd_sectors = 1 << rd_sectors_shift; unsigned int rd_sector_size = brd->brd_sector_size; - unsigned int offset = (sector & (rd_sectors - 1)) << SECTOR_SHIFT; + unsigned int offset = (sector & (rd_sectors - 1)) << brd->brd_logical_sector_shift; size_t copy; copy = min_t(size_t, n, rd_sector_size - offset); @@ -250,7 +252,7 @@ static void copy_from_brd(void *dst, struct brd_device *brd, if (copy < n) { dst += copy; - sector += copy >> SECTOR_SHIFT; + sector += copy >> brd->brd_logical_sector_shift; copy = n - copy; folio = brd_lookup_folio(brd, sector); if (folio) { @@ -309,8 +311,8 @@ static void brd_submit_bio(struct bio *bio) int err; /* Don't support un-aligned buffer */ - WARN_ON_ONCE((iter.offset & (SECTOR_SIZE - 1)) || - (len & (SECTOR_SIZE - 1))); + WARN_ON_ONCE((iter.offset & (brd->brd_logical_sector_size - 1)) || + (len & (brd->brd_logical_sector_size - 1))); err = brd_do_folio(brd, iter.folio, len, iter.offset, bio->bi_opf, sector); @@ -322,7 +324,7 @@ static void brd_submit_bio(struct bio *bio) bio_io_error(bio); return; } - sector += len >> SECTOR_SHIFT; + sector += len >> brd->brd_logical_sector_shift; } bio_endio(bio); @@ -353,6 +355,10 @@ static unsigned int rd_blksize = PAGE_SIZE; module_param(rd_blksize, uint, 0444); MODULE_PARM_DESC(rd_blksize, "Blocksize of each RAM disk in bytes."); +static unsigned int rd_logical_blksize = SECTOR_SIZE; +module_param(rd_logical_blksize, uint, 0444); +MODULE_PARM_DESC(rd_logical_blksize, "Logical blocksize of each RAM disk in bytes."); + MODULE_LICENSE("GPL"); MODULE_ALIAS_BLOCKDEV_MAJOR(RAMDISK_MAJOR); MODULE_ALIAS("rd"); @@ -391,6 +397,8 @@ static int brd_alloc(int i) list_add_tail(&brd->brd_list, &brd_devices); brd->brd_sector_shift = ilog2(rd_blksize); brd->brd_sector_size = rd_blksize; + brd->brd_logical_sector_shift = ilog2(rd_logical_blksize); + brd->brd_logical_sector_size = rd_logical_blksize; spin_lock_init(&brd->brd_lock); INIT_RADIX_TREE(&brd->brd_folios, GFP_ATOMIC); @@ -418,6 +426,7 @@ static int brd_alloc(int i) goto out_cleanup_disk; } blk_queue_physical_block_size(disk->queue, rd_blksize); + blk_queue_logical_block_size(disk->queue, rd_logical_blksize); blk_queue_max_hw_sectors(disk->queue, RD_MAX_SECTOR_SIZE); /* Tell the block layer that this is not a rotational device */ -- 2.35.3