Btrfs: Add O_DIRECT read and write (writes == buffered + cache flush)

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This adds basic O_DIRECT read and write support.  In the write case, we
just do a normal buffered write followed by a cache flush.  O_DIRECT +
O_SYNC are required to trigger metadata syncs.

In the read case, there is a basic btrfs_get_block call for use by
the generic O_DIRECT code.  This does honor multi-volume mapping rules
but it skips all checksumming.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Chris Mason 2008-04-10 10:23:21 -04:00

parent 85d824c4a4

commit 1643298592

2 changed files with 75 additions and 2 deletions

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11

fs/btrfs/file.c

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66

fs/btrfs/inode.c

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