From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org> To: axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org, martin.petersen-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, agk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, snitzer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, shli-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, philipp.reisner-63ez5xqkn6DQT0dZR+AlfA@public.gmane.org, lars.ellenberg-63ez5xqkn6DQT0dZR+AlfA@public.gmane.org Cc: linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-raid-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, drbd-dev-cunTk1MwBs8qoQakbn7OcQ@public.gmane.org Subject: [PATCH 01/27] sd: split sd_setup_discard_cmnd Date: Wed, 5 Apr 2017 16:21:39 +0200 [thread overview] Message-ID: <20170405142205.6477-2-hch@lst.de> (raw) In-Reply-To: <20170405142205.6477-1-hch-jcswGhMUV9g@public.gmane.org> Split sd_setup_discard_cmnd into one function per provisioning type. While this creates some very slight duplication of boilerplate code it keeps the code modular for additions of new provisioning types, and for reusing the write same functions for the upcoming scsi implementation of the Write Zeroes operation. Signed-off-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org> Reviewed-by: Martin K. Petersen <martin.petersen-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org> Reviewed-by: Hannes Reinecke <hare-IBi9RG/b67k@public.gmane.org> --- drivers/scsi/sd.c | 153 ++++++++++++++++++++++++++++++------------------------ 1 file changed, 84 insertions(+), 69 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index fcfeddc79331..b853f91fb3da 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -701,93 +701,97 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); } -/** - * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device - * @sdp: scsi device to operate on - * @rq: Request to prepare - * - * Will issue either UNMAP or WRITE SAME(16) depending on preference - * indicated by target device. - **/ -static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd) +static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) { - struct request *rq = cmd->request; struct scsi_device *sdp = cmd->device; - struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); - sector_t sector = blk_rq_pos(rq); - unsigned int nr_sectors = blk_rq_sectors(rq); - unsigned int len; - int ret; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + unsigned int data_len = 24; char *buf; - struct page *page; - sector >>= ilog2(sdp->sector_size) - 9; - nr_sectors >>= ilog2(sdp->sector_size) - 9; - - page = alloc_page(GFP_ATOMIC | __GFP_ZERO); - if (!page) + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; + rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - switch (sdkp->provisioning_mode) { - case SD_LBP_UNMAP: - buf = page_address(page); - - cmd->cmd_len = 10; - cmd->cmnd[0] = UNMAP; - cmd->cmnd[8] = 24; - - put_unaligned_be16(6 + 16, &buf[0]); - put_unaligned_be16(16, &buf[2]); - put_unaligned_be64(sector, &buf[8]); - put_unaligned_be32(nr_sectors, &buf[16]); + cmd->cmd_len = 10; + cmd->cmnd[0] = UNMAP; + cmd->cmnd[8] = 24; - len = 24; - break; + buf = page_address(rq->special_vec.bv_page); + put_unaligned_be16(6 + 16, &buf[0]); + put_unaligned_be16(16, &buf[2]); + put_unaligned_be64(sector, &buf[8]); + put_unaligned_be32(nr_sectors, &buf[16]); - case SD_LBP_WS16: - cmd->cmd_len = 16; - cmd->cmnd[0] = WRITE_SAME_16; - cmd->cmnd[1] = 0x8; /* UNMAP */ - put_unaligned_be64(sector, &cmd->cmnd[2]); - put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; + rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; - len = sdkp->device->sector_size; - break; + return scsi_init_io(cmd); +} - case SD_LBP_WS10: - case SD_LBP_ZERO: - cmd->cmd_len = 10; - cmd->cmnd[0] = WRITE_SAME; - if (sdkp->provisioning_mode == SD_LBP_WS10) - cmd->cmnd[1] = 0x8; /* UNMAP */ - put_unaligned_be32(sector, &cmd->cmnd[2]); - put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); +static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdp = cmd->device; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + u32 data_len = sdp->sector_size; - len = sdkp->device->sector_size; - break; + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) + return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; + rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - default: - ret = BLKPREP_INVALID; - goto out; - } + cmd->cmd_len = 16; + cmd->cmnd[0] = WRITE_SAME_16; + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be64(sector, &cmd->cmnd[2]); + put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; - cmd->transfersize = len; - cmd->allowed = SD_MAX_RETRIES; + return scsi_init_io(cmd); +} - rq->special_vec.bv_page = page; - rq->special_vec.bv_offset = 0; - rq->special_vec.bv_len = len; +static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap) +{ + struct scsi_device *sdp = cmd->device; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + u32 data_len = sdp->sector_size; + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) + return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - scsi_req(rq)->resid_len = len; - ret = scsi_init_io(cmd); -out: - if (ret != BLKPREP_OK) - __free_page(page); - return ret; + cmd->cmd_len = 10; + cmd->cmnd[0] = WRITE_SAME; + if (unmap) + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be32(sector, &cmd->cmnd[2]); + put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); + + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; + rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; + + return scsi_init_io(cmd); } static void sd_config_write_same(struct scsi_disk *sdkp) @@ -1155,7 +1159,18 @@ static int sd_init_command(struct scsi_cmnd *cmd) switch (req_op(rq)) { case REQ_OP_DISCARD: - return sd_setup_discard_cmnd(cmd); + switch (scsi_disk(rq->rq_disk)->provisioning_mode) { + case SD_LBP_UNMAP: + return sd_setup_unmap_cmnd(cmd); + case SD_LBP_WS16: + return sd_setup_write_same16_cmnd(cmd); + case SD_LBP_WS10: + return sd_setup_write_same10_cmnd(cmd, true); + case SD_LBP_ZERO: + return sd_setup_write_same10_cmnd(cmd, false); + default: + return BLKPREP_INVALID; + } case REQ_OP_WRITE_SAME: return sd_setup_write_same_cmnd(cmd); case REQ_OP_FLUSH: -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de> To: axboe@kernel.dk, martin.petersen@oracle.com, agk@redhat.com, snitzer@redhat.com, shli@kernel.org, philipp.reisner@linbit.com, lars.ellenberg@linbit.com Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, drbd-dev@lists.linbit.com, dm-devel@redhat.com, linux-raid@vger.kernel.org Subject: [PATCH 01/27] sd: split sd_setup_discard_cmnd Date: Wed, 5 Apr 2017 16:21:39 +0200 [thread overview] Message-ID: <20170405142205.6477-2-hch@lst.de> (raw) In-Reply-To: <20170405142205.6477-1-hch@lst.de> Split sd_setup_discard_cmnd into one function per provisioning type. While this creates some very slight duplication of boilerplate code it keeps the code modular for additions of new provisioning types, and for reusing the write same functions for the upcoming scsi implementation of the Write Zeroes operation. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.com> --- drivers/scsi/sd.c | 153 ++++++++++++++++++++++++++++++------------------------ 1 file changed, 84 insertions(+), 69 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index fcfeddc79331..b853f91fb3da 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -701,93 +701,97 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); } -/** - * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device - * @sdp: scsi device to operate on - * @rq: Request to prepare - * - * Will issue either UNMAP or WRITE SAME(16) depending on preference - * indicated by target device. - **/ -static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd) +static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) { - struct request *rq = cmd->request; struct scsi_device *sdp = cmd->device; - struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); - sector_t sector = blk_rq_pos(rq); - unsigned int nr_sectors = blk_rq_sectors(rq); - unsigned int len; - int ret; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + unsigned int data_len = 24; char *buf; - struct page *page; - sector >>= ilog2(sdp->sector_size) - 9; - nr_sectors >>= ilog2(sdp->sector_size) - 9; - - page = alloc_page(GFP_ATOMIC | __GFP_ZERO); - if (!page) + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; + rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - switch (sdkp->provisioning_mode) { - case SD_LBP_UNMAP: - buf = page_address(page); - - cmd->cmd_len = 10; - cmd->cmnd[0] = UNMAP; - cmd->cmnd[8] = 24; - - put_unaligned_be16(6 + 16, &buf[0]); - put_unaligned_be16(16, &buf[2]); - put_unaligned_be64(sector, &buf[8]); - put_unaligned_be32(nr_sectors, &buf[16]); + cmd->cmd_len = 10; + cmd->cmnd[0] = UNMAP; + cmd->cmnd[8] = 24; - len = 24; - break; + buf = page_address(rq->special_vec.bv_page); + put_unaligned_be16(6 + 16, &buf[0]); + put_unaligned_be16(16, &buf[2]); + put_unaligned_be64(sector, &buf[8]); + put_unaligned_be32(nr_sectors, &buf[16]); - case SD_LBP_WS16: - cmd->cmd_len = 16; - cmd->cmnd[0] = WRITE_SAME_16; - cmd->cmnd[1] = 0x8; /* UNMAP */ - put_unaligned_be64(sector, &cmd->cmnd[2]); - put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; + rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; - len = sdkp->device->sector_size; - break; + return scsi_init_io(cmd); +} - case SD_LBP_WS10: - case SD_LBP_ZERO: - cmd->cmd_len = 10; - cmd->cmnd[0] = WRITE_SAME; - if (sdkp->provisioning_mode == SD_LBP_WS10) - cmd->cmnd[1] = 0x8; /* UNMAP */ - put_unaligned_be32(sector, &cmd->cmnd[2]); - put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); +static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdp = cmd->device; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + u32 data_len = sdp->sector_size; - len = sdkp->device->sector_size; - break; + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) + return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; + rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - default: - ret = BLKPREP_INVALID; - goto out; - } + cmd->cmd_len = 16; + cmd->cmnd[0] = WRITE_SAME_16; + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be64(sector, &cmd->cmnd[2]); + put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; - cmd->transfersize = len; - cmd->allowed = SD_MAX_RETRIES; + return scsi_init_io(cmd); +} - rq->special_vec.bv_page = page; - rq->special_vec.bv_offset = 0; - rq->special_vec.bv_len = len; +static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap) +{ + struct scsi_device *sdp = cmd->device; + struct request *rq = cmd->request; + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); + u32 data_len = sdp->sector_size; + rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); + if (!rq->special_vec.bv_page) + return BLKPREP_DEFER; + rq->special_vec.bv_offset = 0; + rq->special_vec.bv_len = data_len; rq->rq_flags |= RQF_SPECIAL_PAYLOAD; - scsi_req(rq)->resid_len = len; - ret = scsi_init_io(cmd); -out: - if (ret != BLKPREP_OK) - __free_page(page); - return ret; + cmd->cmd_len = 10; + cmd->cmnd[0] = WRITE_SAME; + if (unmap) + cmd->cmnd[1] = 0x8; /* UNMAP */ + put_unaligned_be32(sector, &cmd->cmnd[2]); + put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); + + cmd->allowed = SD_MAX_RETRIES; + cmd->transfersize = data_len; + rq->timeout = SD_TIMEOUT; + scsi_req(rq)->resid_len = data_len; + + return scsi_init_io(cmd); } static void sd_config_write_same(struct scsi_disk *sdkp) @@ -1155,7 +1159,18 @@ static int sd_init_command(struct scsi_cmnd *cmd) switch (req_op(rq)) { case REQ_OP_DISCARD: - return sd_setup_discard_cmnd(cmd); + switch (scsi_disk(rq->rq_disk)->provisioning_mode) { + case SD_LBP_UNMAP: + return sd_setup_unmap_cmnd(cmd); + case SD_LBP_WS16: + return sd_setup_write_same16_cmnd(cmd); + case SD_LBP_WS10: + return sd_setup_write_same10_cmnd(cmd, true); + case SD_LBP_ZERO: + return sd_setup_write_same10_cmnd(cmd, false); + default: + return BLKPREP_INVALID; + } case REQ_OP_WRITE_SAME: return sd_setup_write_same_cmnd(cmd); case REQ_OP_FLUSH: -- 2.11.0
next prev parent reply other threads:[~2017-04-05 14:21 UTC|newest] Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-05 14:21 always use REQ_OP_WRITE_ZEROES for zeroing offload V2 Christoph Hellwig 2017-04-05 14:21 ` Christoph Hellwig [not found] ` <20170405142205.6477-1-hch-jcswGhMUV9g@public.gmane.org> 2017-04-05 14:21 ` Christoph Hellwig [this message] 2017-04-05 14:21 ` [PATCH 01/27] sd: split sd_setup_discard_cmnd Christoph Hellwig 2017-04-05 14:21 ` [PATCH 02/27] block: renumber REQ_OP_WRITE_ZEROES Christoph Hellwig 2017-04-05 14:21 ` Christoph Hellwig 2017-04-05 14:21 ` [PATCH 03/27] block: implement splitting of REQ_OP_WRITE_ZEROES bios Christoph Hellwig 2017-04-05 14:21 ` Christoph Hellwig 2017-04-10 19:40 ` Anthony Youngman 2017-04-05 14:51 ` always use REQ_OP_WRITE_ZEROES for zeroing offload V2 Christoph Hellwig 2017-04-05 14:51 ` Christoph Hellwig 2017-04-05 14:21 ` [PATCH 04/27] sd: implement REQ_OP_WRITE_ZEROES Christoph Hellwig 2017-04-05 14:21 ` [PATCH 05/27] md: support REQ_OP_WRITE_ZEROES Christoph Hellwig 2017-04-05 14:21 ` [PATCH 06/27] dm io: discards don't take a payload Christoph Hellwig 2017-04-05 14:21 ` [PATCH 07/27] dm: support REQ_OP_WRITE_ZEROES Christoph Hellwig 2017-04-05 14:21 ` [PATCH 08/27] dm kcopyd: switch to use REQ_OP_WRITE_ZEROES Christoph Hellwig 2017-04-05 14:21 ` [PATCH 09/27] block: stop using blkdev_issue_write_same for zeroing Christoph Hellwig 2017-04-05 14:21 ` [PATCH 10/27] block: add a flags argument to (__)blkdev_issue_zeroout Christoph Hellwig 2017-04-05 14:21 ` [PATCH 11/27] block: add a REQ_NOUNMAP flag for REQ_OP_WRITE_ZEROES Christoph Hellwig 2017-04-05 14:21 ` [PATCH 12/27] block: add a new BLKDEV_ZERO_NOFALLBACK flag Christoph Hellwig 2017-04-05 14:21 ` [PATCH 13/27] block_dev: use blkdev_issue_zerout for hole punches Christoph Hellwig 2017-04-05 14:21 ` [PATCH 14/27] sd: implement unmapping Write Zeroes Christoph Hellwig 2017-04-05 14:21 ` [PATCH 15/27] nvme: implement REQ_OP_WRITE_ZEROES Christoph Hellwig 2017-04-05 14:21 ` [PATCH 16/27] zram: " Christoph Hellwig 2017-04-05 14:21 ` [PATCH 17/27] loop: " Christoph Hellwig 2017-04-05 17:20 always use REQ_OP_WRITE_ZEROES for zeroing offload V2 Christoph Hellwig 2017-04-05 17:20 ` [PATCH 01/27] sd: split sd_setup_discard_cmnd Christoph Hellwig 2017-04-05 17:20 ` Christoph Hellwig
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