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| author | Chaitanya Kulkarni | 2018-06-20 06:01:41 +0200 |
|---|---|---|
| committer | Christoph Hellwig | 2018-07-23 09:35:14 +0200 |
| commit | 55eb942eda2ccbbbea61db4c1a774ba22b618046 (patch) | |
| tree | cfeeeaadeaf87b88e73a6bdf2ec878fc846b8b11 /drivers/nvme/target/core.c | |
| parent | nvmet: add commands supported and effects log page (diff) | |
| download | kernel-qcow2-linux-55eb942eda2ccbbbea61db4c1a774ba22b618046.tar.gz kernel-qcow2-linux-55eb942eda2ccbbbea61db4c1a774ba22b618046.tar.xz kernel-qcow2-linux-55eb942eda2ccbbbea61db4c1a774ba22b618046.zip | |
nvmet: add buffered I/O support for file backed ns
Add a new "buffered_io" attribute, which disabled direct I/O and thus
enables page cache based caching when enabled. The attribute can only
be changed when the namespace is disabled as the file has to be reopend
for the change to take effect.
The possibly blocking read/write are deferred to a newly introduced
global workqueue.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme/target/core.c')
| -rw-r--r-- | drivers/nvme/target/core.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 74d4b785d2da..96eafbd419e7 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -18,6 +18,7 @@ #include "nvmet.h" +struct workqueue_struct *buffered_io_wq; static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX]; static DEFINE_IDA(cntlid_ida); @@ -437,6 +438,7 @@ struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid) ns->nsid = nsid; ns->subsys = subsys; uuid_gen(&ns->uuid); + ns->buffered_io = false; return ns; } @@ -1109,6 +1111,12 @@ static int __init nvmet_init(void) { int error; + buffered_io_wq = alloc_workqueue("nvmet-buffered-io-wq", + WQ_MEM_RECLAIM, 0); + if (!buffered_io_wq) { + error = -ENOMEM; + goto out; + } error = nvmet_init_discovery(); if (error) goto out; @@ -1129,6 +1137,7 @@ static void __exit nvmet_exit(void) nvmet_exit_configfs(); nvmet_exit_discovery(); ida_destroy(&cntlid_ida); + destroy_workqueue(buffered_io_wq); BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_entry) != 1024); BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_hdr) != 1024); |