4dd18932ba
As originally implemented the mzap_upgrade() function will perform up to SPA_MAXBLOCKSIZE allocations using kmem_alloc(). These large allocations can potentially block indefinitely if contiguous memory is not available. Since this allocation is done under the zap->zap_rwlock it can appear as if there is a deadlock in zap_lockdir(). This is shown below. The optimal fix for this would be to rework mzap_upgrade() such that no large allocations are required. This could be done but it would result in us diverging further from the other implementations. Therefore I've opted against doing this unless it becomes absolutely necessary. Instead mzap_upgrade() has been updated to use zio_buf_alloc() which can reliably provide buffers of up to SPA_MAXBLOCKSIZE. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Close #2580
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