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| author | Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com> | 2016-11-30 21:29:02 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-12-01 15:58:40 +0100 |
| commit | d262920998c891dfd87cf73f823f0ff60e20cdad (patch) | |
| tree | 3d612a7f233c8d714d5a23546e767211093fcf7c /drivers/nvme | |
| parent | nvme: add support for the Write Zeroes command (diff) | |
| download | linux-d262920998c891dfd87cf73f823f0ff60e20cdad.tar.xz linux-d262920998c891dfd87cf73f823f0ff60e20cdad.zip | |
nvmet: add support for the Write Zeroes command
Add support for handling write zeroes command on target.
Call into __blkdev_issue_zeroout, which the block layer expands into the
best suitable variant of zeroing the LBAs. Allow write zeroes operation
to deallocate the LBAs when calling __blkdev_issue_zeroout.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/target/admin-cmd.c | 3 | ||||
| -rw-r--r-- | drivers/nvme/target/io-cmd.c | 29 |
2 files changed, 31 insertions, 1 deletions
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index 7ab9c9381b98..383ea10b97cc 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -237,7 +237,8 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req) id->maxcmd = cpu_to_le16(NVMET_MAX_CMD); id->nn = cpu_to_le32(ctrl->subsys->max_nsid); - id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM); + id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM | + NVME_CTRL_ONCS_WRITE_ZEROES); /* XXX: don't report vwc if the underlying device is write through */ id->vwc = NVME_CTRL_VWC_PRESENT; diff --git a/drivers/nvme/target/io-cmd.c b/drivers/nvme/target/io-cmd.c index c4dc9ea8ade0..4195115c7e54 100644 --- a/drivers/nvme/target/io-cmd.c +++ b/drivers/nvme/target/io-cmd.c @@ -170,6 +170,32 @@ static void nvmet_execute_dsm(struct nvmet_req *req) } } +static void nvmet_execute_write_zeroes(struct nvmet_req *req) +{ + struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes; + struct bio *bio = NULL; + u16 status = NVME_SC_SUCCESS; + sector_t sector; + sector_t nr_sector; + + sector = le64_to_cpu(write_zeroes->slba) << + (req->ns->blksize_shift - 9); + nr_sector = (((sector_t)le32_to_cpu(write_zeroes->length)) << + (req->ns->blksize_shift - 9)) + 1; + + if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector, + GFP_KERNEL, &bio, true)) + status = NVME_SC_INTERNAL | NVME_SC_DNR; + + if (bio) { + bio->bi_private = req; + bio->bi_end_io = nvmet_bio_done; + submit_bio(bio); + } else { + nvmet_req_complete(req, status); + } +} + int nvmet_parse_io_cmd(struct nvmet_req *req) { struct nvme_command *cmd = req->cmd; @@ -207,6 +233,9 @@ int nvmet_parse_io_cmd(struct nvmet_req *req) req->data_len = le32_to_cpu(cmd->dsm.nr + 1) * sizeof(struct nvme_dsm_range); return 0; + case nvme_cmd_write_zeroes: + req->execute = nvmet_execute_write_zeroes; + return 0; default: pr_err("nvmet: unhandled cmd %d\n", cmd->common.opcode); return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; |