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authorDavid Howells <dhowells@redhat.com>2013-09-21 03:09:31 +0400
committerDavid Howells <dhowells@redhat.com>2013-09-27 21:40:25 +0400
commit8fb883f3e30065529e4f35d4b4f355193dcdb7a2 (patch)
tree2a1096b66c9465539fb6e13daa16137d730f3ea3 /fs/ceph
parent2457aaf73a97a97c8596ed3903bd09601976f3bc (diff)
downloadlinux-8fb883f3e30065529e4f35d4b4f355193dcdb7a2.tar.xz
FS-Cache: Add use/unuse/wake cookie wrappers
Add wrapper functions for dealing with cookie->n_active: (*) __fscache_use_cookie() to increment it. (*) __fscache_unuse_cookie() to decrement and test against zero. (*) __fscache_wake_unused_cookie() to wake up anyone waiting for it to reach zero. The second and third are split so that the third can be done after cookie->lock has been released in case the waiter wakes up whilst we're still holding it and tries to get it. We will need to wake-on-zero once the cookie disablement patch is applied because it will then be possible to see n_active become zero without the cookie being relinquished. Also move the cookie usement out of fscache_attr_changed_op() and into fscache_attr_changed() and the operation struct so that cookie disablement will be able to track it. Whilst we're at it, only increment n_active if we're about to do fscache_submit_op() so that we don't have to deal with undoing it if anything earlier fails. Possibly this should be moved into fscache_submit_op() which could look at FSCACHE_OP_UNUSE_COOKIE. Signed-off-by: David Howells <dhowells@redhat.com>
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