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| author | Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> | 2018-05-23 06:34:39 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-05-25 16:50:12 +0200 |
| commit | d5eff33ee6f80864d889d64fd3f6ea7b78dd1b24 (patch) | |
| tree | c1fde2a87945df698f3a7bed7be6f76d11276e10 /drivers/nvme/target/nvmet.h | |
| parent | nvmet: remove duplicate NULL initialization for req->ns (diff) | |
| download | linux-d5eff33ee6f80864d889d64fd3f6ea7b78dd1b24.tar.xz linux-d5eff33ee6f80864d889d64fd3f6ea7b78dd1b24.zip | |
nvmet: add simple file backed ns support
This patch adds simple file backed namespace support for NVMeOF target.
The new file io-cmd-file.c is responsible for handling the code for I/O
commands when ns is file backed. Also, we introduce mempools based slow
path using sync I/Os for file backed ns to ensure forward progress under
reclaim.
The old block device based implementation is moved to io-cmd-bdev.c and
use a "nvmet_bdev_" symbol prefix. The enable/disable calls are also
move into the respective files.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
[hch: updated changelog, fixed double req->ns lookup in bdev case]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to '')
| -rw-r--r-- | drivers/nvme/target/nvmet.h | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index 15fd84ab21f8..2d09afcfe505 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -43,6 +43,7 @@ struct nvmet_ns { struct list_head dev_link; struct percpu_ref ref; struct block_device *bdev; + struct file *file; u32 nsid; u32 blksize_shift; loff_t size; @@ -57,6 +58,8 @@ struct nvmet_ns { struct config_group group; struct completion disable_done; + mempool_t *bvec_pool; + struct kmem_cache *bvec_cache; }; static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item) @@ -222,8 +225,18 @@ struct nvmet_req { struct nvmet_cq *cq; struct nvmet_ns *ns; struct scatterlist *sg; - struct bio inline_bio; struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; + union { + struct { + struct bio inline_bio; + } b; + struct { + bool mpool_alloc; + struct kiocb iocb; + struct bio_vec *bvec; + struct work_struct work; + } f; + }; int sg_cnt; /* data length as parsed from the command: */ size_t data_len; @@ -263,7 +276,8 @@ struct nvmet_async_event { }; u16 nvmet_parse_connect_cmd(struct nvmet_req *req); -u16 nvmet_parse_io_cmd(struct nvmet_req *req); +u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req); +u16 nvmet_file_parse_io_cmd(struct nvmet_req *req); u16 nvmet_parse_admin_cmd(struct nvmet_req *req); u16 nvmet_parse_discovery_cmd(struct nvmet_req *req); u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req); @@ -338,4 +352,14 @@ extern struct rw_semaphore nvmet_config_sem; bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, const char *hostnqn); +int nvmet_bdev_ns_enable(struct nvmet_ns *ns); +int nvmet_file_ns_enable(struct nvmet_ns *ns); +void nvmet_bdev_ns_disable(struct nvmet_ns *ns); +void nvmet_file_ns_disable(struct nvmet_ns *ns); + +static inline u32 nvmet_rw_len(struct nvmet_req *req) +{ + return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) << + req->ns->blksize_shift; +} #endif /* _NVMET_H */ |