On 05/22/2014 11:05 AM, Jeff Mahoney wrote: > - gpg control packet > On 5/22/14, 8:19 AM, Chris Mason wrote: >> Can we safely reinit a kobject that has been put in use in sysfs? >> Given all the things that can hold refs etc is this legal? > > It depends on how the kobject is being used. > > It wouldn't be safe to re-use the kobject embedded in space_info since > it controls the lifetime of the object, regardless of its use in sysfs. > > The kobjects for block groups only exist for creating the > subdirectories and their lifetime is actually the lifetime of the > space_info. We take a reference to the space_info when we add them to > sysfs because that's where they draw their data. The only reference to > a block group kobject is taken when we add it to sysfs and is dropped > when we remove it. Holding a sysfs file open doesn't pin the kobject, > so once we remove it from sysfs (kobject_del waits for readers to > complete), it's safe to reinitialize it. > Fair enough, once you've tested this new patch a bit I'll drop mine for yours. Thanks! -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
