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authorAndrew Gallagher <agallagher@fb.com>2013-11-05 16:05:52 +0100
committerMiklos Szeredi <mszeredi@suse.cz>2014-01-22 19:36:59 +0100
commit7678ac50615d9c7a491d9861e020e4f5f71b594c (patch)
tree0625a52697800b032fd60b652833cf0ba04e43ae /net
parent451418fc928b5ec1ee96a9afac807b6312811a2a (diff)
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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>
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