nvmet: add buffered I/O support for file backed ns

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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>

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This commit is contained in:

Chaitanya Kulkarni 2018-06-20 00:01:41 -04:00 • committed by Christoph Hellwig

parent 0866bf0c37

commit 55eb942eda

4 changed files with 67 additions and 5 deletions

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29

drivers/nvme/target/configfs.c

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9

drivers/nvme/target/core.c

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31

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

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3

drivers/nvme/target/nvmet.h

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