OpenZFS on Linux and FreeBSD
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Brian Behlendorf 16da688f25 Linux 5.13 compat: retry zvol_open() when contended
Due to a possible lock inversion the zvol open call path on Linux
needs to be able to retry in the case where the spa_namespace_lock
cannot be acquired.

For Linux 5.12 an older kernel this was accomplished by returning
-ERESTARTSYS from zvol_open() to request that blkdev_get() drop
the bdev->bd_mutex lock, reaquire it, then call the open callback
again.  However, as of the 5.13 kernel this behavior was removed.

Therefore, for 5.12 and older kernels we preserved the existing
retry logic, but for 5.13 and newer kernels we retry internally in
zvol_open().  This should always succeed except in the case where
a pool's vdev are layed on zvols, in which case it may fail.  To
handle this case vdev_disk_open() has been updated to retry when
opening a device when -ERESTARTSYS is returned.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue 
Closes 
2021-12-06 12:22:57 -08:00
.github Add zfs-test facility to automatically rerun failing tests 2021-12-06 12:22:43 -08:00
cmd zed: Control NVMe fault LEDs 2021-11-05 07:51:21 -07:00
config Linux 5.13 compat: retry zvol_open() when contended 2021-12-06 12:22:57 -08:00
contrib Fix plymouth passphrase prompt with dracut 2021-06-29 13:14:49 -07:00
etc systemd: import: expand $ZPOOL_IMPORT_OPTS correctly 2021-06-15 16:56:53 -07:00
include Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-05 08:08:55 -07:00
lib Upgrade to libabigail 2.0.0 2021-11-05 07:59:40 -07:00
man Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-05 08:08:55 -07:00
module Linux 5.13 compat: retry zvol_open() when contended 2021-12-06 12:22:57 -08:00
rpm Correct a flaw in the Python 3 version checking () 2021-11-01 14:54:47 -07:00
scripts Add zfs-test facility to automatically rerun failing tests 2021-12-06 12:22:43 -08:00
tests Linux 5.13 compat: retry zvol_open() when contended 2021-12-06 12:22:57 -08:00
udev Udev rules: use match (==) rather than assign (=) for PROGRAM 2021-09-14 12:23:10 -07:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore Add FreeBSD support to OpenZFS 2020-04-14 11:36:28 -07:00
.gitmodules .gitmodules: link to openzfs github repository 2021-04-14 13:23:08 -07:00
AUTHORS Add zstd support to zfs 2020-08-20 10:30:06 -07:00
CODE_OF_CONDUCT.md Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
COPYRIGHT Fix typos 2020-06-09 21:24:09 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
META Tag 2.1.1 2021-09-15 13:37:50 -07:00
Makefile.am Upgrade to libabigail 2.0.0 2021-11-05 07:59:40 -07:00
NEWS Fix NEWS file 2020-08-26 21:44:41 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md Update FreeBSD versions 2021-03-16 15:03:28 -07:00
RELEASES.md Add RELEASES.md file 2021-04-07 13:26:58 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
configure.ac Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-05 08:08:55 -07:00
copy-builtin copy-builtin: posix conformance 2021-05-10 12:18:54 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.