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authorDavid Howells <dhowells@redhat.com>2009-11-19 21:11:22 +0300
committerDavid Howells <dhowells@redhat.com>2009-11-19 21:11:22 +0300
commit6897e3df8fc37bd4a58bbcdef8306da7fc175584 (patch)
treee826cd96f0395775d4fea113dc283ae0282f0384 /Documentation/filesystems
parent5753c441889253e4323eee85f791a1d64cf08196 (diff)
downloadlinux-6897e3df8fc37bd4a58bbcdef8306da7fc175584.tar.xz
FS-Cache: The object-available state can't rely on the cookie to be available
The object-available state in the object processing state machine (as processed by fscache_object_available()) can't rely on the cookie to be available because the FSCACHE_COOKIE_CREATING bit may have been cleared by fscache_obtained_object() prior to the object being put into the FSCACHE_OBJECT_AVAILABLE state. Clearing the FSCACHE_COOKIE_CREATING bit on a cookie permits __fscache_relinquish_cookie() to proceed and detach the cookie from the object. To deal with this, we don't dereference object->cookie in fscache_object_available() if the object has already been detached. In addition, a couple of assertions are added into fscache_drop_object() to make sure the object is unbound from the cookie before it gets there. Signed-off-by: David Howells <dhowells@redhat.com>
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