nvmet: add simple file backed ns support

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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>

...

This commit is contained in:

Chaitanya Kulkarni 2018-05-23 00:34:39 -04:00 • committed by Christoph Hellwig

parent 618cff4285

commit d5eff33ee6

7 changed files with 610 additions and 249 deletions

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4

drivers/nvme/target/Makefile

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8

drivers/nvme/target/admin-cmd.c

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50

drivers/nvme/target/core.c

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75

drivers/nvme/target/io-cmd.c → drivers/nvme/target/io-cmd-bdev.c

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300

drivers/nvme/target/io-cmd-file.c

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28

drivers/nvme/target/nvmet.h

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