FreeBSD src
The existing assertions in vdev_label_read() and vdev_label_write(), testing which config locks are held, are incorrect. The assertions test for locks which exceed what is required for safety. Both vdev_label_{read,write}() are changed to assert SCL_STATE is held as RW_READER or RW_WRITER. This is safe because: Changes to the vdev tree occur under SCL_ALL as RW_WRITER, via spa_vdev_enter() and spa_vdev_exit(). Changes to vdev state occur under SCL_STATE_ALL as RW_WRITER, via spa_vdev_state_enter() and spa_vdev_state_exit(). Therefore, the new assertions guarantee that the vdev cannot change out from under a zio, and I/O to a specified leaf vdev's label is safe. Furthermore, this is consistent with the SPA locking discussion in spa_misc.c, "For any zio operation that takes an explicit vdev_t argument ... zio_read_phys(), or zio_write_phys() ... SCL_STATE as reader suffices." Reviewed-by: Chunwei Chen <david.chen@osnexus.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #5983 |
||
---|---|---|
.github | ||
cmd | ||
config | ||
contrib | ||
etc | ||
include | ||
lib | ||
man | ||
module | ||
rpm | ||
scripts | ||
tests | ||
udev | ||
.gitignore | ||
.gitmodules | ||
AUTHORS | ||
autogen.sh | ||
configure.ac | ||
copy-builtin | ||
COPYRIGHT | ||
DISCLAIMER | ||
Makefile.am | ||
META | ||
OPENSOLARIS.LICENSE | ||
README.markdown | ||
TEST | ||
zfs-script-config.sh.in | ||
zfs.release.in |
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. And it's native!
Official Resources
Installation
Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.
Contribute & Develop
We have a separate document with contribution guidelines.