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Tim Chase
3937ab20f3
Restructure the zfsdev_state_list to allow for lock-free reading by converting to a simple singly-linked list from which items are never deleted and over which only forward iterations are performed. It depends on, among other things, the atomicity of accessing the zs_minor integer and zs_next pointer. This fixes a lock inversion in which the zfsdev_state_lock is used by both the sync task (txg_sync) and indirectly by any user program which uses /dev/zfs; the zfsdev_release method uses the same lock and then blocks on the sync task. The most typical failure scenerio occurs when the sync task is cleaning up a user hold while various concurrent "zfs" commands are in progress. Neither Illumos nor Solaris are affected by this issue because they use DDI interface which provides lock-free reading of device state via the ddi_get_soft_state() function. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2301
Native ZFS for Linux!
ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.
ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.
Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org