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| author | Andrew Gallagher <agallagher@fb.com> | 2013-11-05 19:05:52 +0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2014-01-22 22:36:59 +0400 |
| commit | 7678ac50615d9c7a491d9861e020e4f5f71b594c (patch) | |
| tree | 0625a52697800b032fd60b652833cf0ba04e43ae /fs/fuse/fuse_i.h | |
| parent | 451418fc928b5ec1ee96a9afac807b6312811a2a (diff) | |
| download | linux-7678ac50615d9c7a491d9861e020e4f5f71b594c.tar.xz | |
fuse: support clients that don't implement 'open'
open/release operations require userspace transitions to keep track
of the open count and to perform any FS-specific setup. However,
for some purely read-only FSs which don't need to perform any setup
at open/release time, we can avoid the performance overhead of
calling into userspace for open/release calls.
This patch adds the necessary support to the fuse kernel modules to prevent
open/release operations from hitting in userspace. When the client returns
ENOSYS, we avoid sending the subsequent release to userspace, and also
remember this so that future opens also don't trigger a userspace
operation.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse/fuse_i.h')
| -rw-r--r-- | fs/fuse/fuse_i.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index dc44b9e3a0c9..2da5db2c8bdb 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -485,6 +485,9 @@ struct fuse_conn { * and hence races in setting them will not cause malfunction */ + /** Is open/release not implemented by fs? */ + unsigned no_open:1; + /** Is fsync not implemented by fs? */ unsigned no_fsync:1; |