diff options
author | Anand Avati <avati@redhat.com> | 2012-02-17 12:46:25 -0500 |
---|---|---|
committer | Miklos Szeredi <mszeredi@suse.cz> | 2012-03-05 15:48:11 +0100 |
commit | 4273b793ec68753cc3fcf5be7cbfd88c2be2058d (patch) | |
tree | b00b18e0c50d9c2f1a93077307c8c2e9dac1ae9b /fs/fuse/inode.c | |
parent | ac45d61357e86b9a0cf14e45e8e09dfb626970ef (diff) | |
download | op-kernel-dev-4273b793ec68753cc3fcf5be7cbfd88c2be2058d.zip op-kernel-dev-4273b793ec68753cc3fcf5be7cbfd88c2be2058d.tar.gz |
fuse: O_DIRECT support for files
Implement ->direct_IO() method in aops. The ->direct_IO() method combines
the existing fuse_direct_read/fuse_direct_write methods to implement
O_DIRECT functionality.
Reaching ->direct_IO() in the read path via generic_file_aio_read ensures
proper synchronization with page cache with its existing framework.
Reaching ->direct_IO() in the write path via fuse_file_aio_write is made
to come via generic_file_direct_write() which makes it play nice with
the page cache w.r.t other mmap pages etc.
On files marked 'direct_io' by the filesystem server, IO always follows
the fuse_direct_read/write path. There is no effect of fcntl(O_DIRECT)
and it always succeeds.
On files not marked with 'direct_io' by the filesystem server, the IO
path depends on O_DIRECT flag by the application. This can be passed
at the time of open() as well as via fcntl().
Note that asynchronous O_DIRECT iocb jobs are completed synchronously
always (this has been the case with FUSE even before this patch)
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse/inode.c')
0 files changed, 0 insertions, 0 deletions