1eacf2b3b0
The kernel function which adds new zvols as disks to the system, add_disk(), briefly opens and closes the zvol as part of its work. Closing a zvol involves waiting for two txgs to sync. This, combined with the fact that the taskq processing new zvols is single threaded, makes this processing new zvols slow. Waiting for these txgs to sync is only necessary if the zvol has been written to, which is not the case during add_disk(). This change adds tracking of whether a zvol has been written to so that we can skip the txg_wait_synced() calls when they are unnecessary. This change also fixes the flags passed to blkdev_get_by_path() by vdev_disk_open() to be FMODE_READ | FMODE_WRITE | FMODE_EXCL instead of just FMODE_EXCL. The flags were being incorrectly calculated because we were using the wrong version of vdev_bdev_mode(). Reviewed-by: George Wilson <george.wilson@delphix.com> Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: John Gallagher <john.gallagher@delphix.com> Closes #8526 Closes #8615 |
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README.md
ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
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.
Release
ZFS on Linux is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported kernel versions.