FreeBSD src
74328ee18f
There exists a lock inversions involving the zfs range lock and the individual page writeback bits which can result in a deadlock. To prevent this we must always manipulate the writeback bit while holding the range lock. The exact deadlock is as follows: ------ Process A ------ ------ Process B ------ zpl_writepages zpl_fallocate write_cache_pages zpl_fallocate_common zpl_putpage zfs_space zfs_putpage (set bit) zfs_freesp zfs_range_lock (wait on lock) zfs_free_range (take lock) [has not yet initiated I/O, truncate_inode_pages_range the bit will not be cleared] wait_on_page_writeback (wait on bit) Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Richard Yao <richard.yao@clusterhq.com> Issue #2976 |
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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