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OpenZFS on Linux and FreeBSD
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Alexander Lobakin ee93cbc9d4 icp: properly fix all RETs in x86_64 Asm code 
Commit 43569ee374 ("Fix objtool: missing int3 after ret warning")
addressed replacing all `ret`s in x86 asm code to a macro in the
Linux kernel in order to enable SLS. That was done by copying the
upstream macro definitions and fixed objtool complaints.
Since then, several more mitigations were introduced, including
Rethunk. It requires to have a jump to one of the thunks in order
to work, so the RET macro was changed again. And, as ZFS code
didn't use the mainline defition, but copied it, this is currently
missing.

Objtool reminds about it time to time (Clang 16, CONFIG_RETHUNK=y):

fs/zfs/lua/zlua.o: warning: objtool: setjmp+0x25: 'naked' return
 found in RETHUNK build
fs/zfs/lua/zlua.o: warning: objtool: longjmp+0x27: 'naked' return
 found in RETHUNK build

Do it the following way:
* if we're building under Linux, unconditionally include
  <linux/linkage.h> in the related files. It is available in x86
  sources since even pre-2.6 times, so doesn't need any conftests;
* then, if RET macro is available, it will be used directly, so that
  we will always have the version actual to the kernel we build;
* if there's no such macro, we define it as a simple `ret`, as it
  was on pre-SLS times.

This ensures we always have the up-to-date definition with no need
to update it manually, and at the same time is safe for the whole
variety of kernels ZFS module supports.
Then, there's a couple more "naked" rets left in the code, they're
just defined as:

	.byte 0xf3,0xc3

In fact, this is just:

	rep ret

`rep ret` instead of just `ret` seems to mitigate performance issues
on some old AMD processors and most likely makes no sense as of
today.
Anyways, address those rets, so that they will be protected with
Rethunk and SLS. Include <sys/asm_linkage.h> here which now always
has RET definition and replace those constructs with just RET.
This wipes the last couple of places with unpatched rets objtool's
been complaining about.

Reviewed-by: Attila Fülöp <attila@fueloep.org>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
Closes #14035
 		2022-11-30 10:15:58 -08:00
.github CI: bump actions/upload-artifact to v3 2022-11-01 12:38:22 -07:00
cmd zed: Avoid core dump if wholedisk property does not exist 2022-11-08 10:10:05 -08:00
config Linux compat: fix DECLARE_EVENT_CLASS() test when ZFS is built-in 2022-11-01 12:43:29 -07:00
contrib contrib: dracut: zfs-snapshot-bootfs: exit status fix 2022-10-20 11:37:21 -07:00
etc etc: mask zfs-load-key.service 2022-10-12 15:29:21 -07:00
include Linux: Remove ZFS_AC_KERNEL_SRC_MODULE_PARAM_CALL_CONST autotools check 2022-11-01 12:42:01 -07:00
lib libzfs recv: Check if user prop before inheritable 2022-11-30 10:13:23 -08:00
man Bring per_txg_dirty_frees_percent back to 30 2022-11-01 12:32:40 -07:00
module icp: properly fix all RETs in x86_64 Asm code 2022-11-30 10:15:58 -08:00
rpm rpm: Silence "unversioned Obsoletes" warnings on EL 9 2022-09-13 17:50:59 -07:00
scripts Remove REMAKE_INITRD 2022-05-06 11:32:45 -07:00
tests zed: Prevent special vdev to be replaced by hot spare 2022-11-07 13:36:57 -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 Linux 6.0 compat: META 2022-11-01 12:43:49 -07:00
Makefile.am config: check for parallel(1), use it for cstyle 2022-09-14 11:23:25 -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 README: Update OpenZFS website url 2022-02-16 17:58:55 -08:00
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 Linux 5.16 compat: don't use XSTATE_XSAVE to save FPU state 2022-02-16 17:58:55 -08:00
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

img

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.