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zfs/module/os/linux/spl
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Matthew Ahrens 270ece24b6
Revise SPL wrapper for shrinker callbacks 
The SPL provides a wrapper for the kernel's shrinker callbacks, which
enables the ZFS code to interface with multiple versions of the shrinker
API's from different kernel versions.  Specifically, Linux kernels 3.0 -
3.11 has a single "combined" callback, and Linux kernels 3.12 and later
have two "split" callbacks.  The SPL provides a wrapper function so that
the ZFS code only needs to implement one version of the callbacks.

Currently the SPL's wrappers are designed such that the ZFS code
implements the older, "combined" callback.  There are a few downsides to
this approach:

* The general design within ZFS is for the latest Linux kernel to be
considered the "first class" API.

* The newer, "split" callback API is easier to understand, because each
callback has one purpose.

* The current wrappers do not completely abstract out the differing
API's, so ZFS code needs `#ifdef` code to handle the differing return
values required for different kernel versions.

This commit addresses these drawbacks by having the ZFS code provide the
latest, "split" callbacks, and the SPL provides a wrapping function for
the older, "combined" API.

Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #10502
 		2020-06-27 10:27:02 -07:00
..
Makefile.in Add zfs_file_* interface, remove vnodes 2019-11-21 09:32:57 -08:00
README.md Change http://zfsonlinux.org links to https://zfsonlinux.org 2020-01-13 16:43:59 -08:00
THIRDPARTYLICENSE.gplv2 OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
THIRDPARTYLICENSE.gplv2.descrip OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
spl-atomic.c OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
spl-condvar.c Disambiguate condvar API contract 2020-06-18 10:17:50 -07:00
spl-cred.c Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
spl-err.c OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
spl-generic.c Switch off -Wmissing-prototypes for libgcc math functions 2020-06-18 12:21:46 -07:00
spl-kmem-cache.c Revise SPL wrapper for shrinker callbacks 2020-06-27 10:27:02 -07:00
spl-kmem.c Move GFP flags kernel compatibility code 2020-06-08 16:33:46 -07:00
spl-kstat.c Linux 5.6 compat: struct proc_ops 2020-02-07 11:03:53 -08:00
spl-proc.c Use percpu_counter for obj_alloc counter of Linux-backed caches 2020-06-26 18:06:50 -07:00
spl-procfs-list.c Linux 5.6 compat: struct proc_ops 2020-02-07 11:03:53 -08:00
spl-taskq.c Improve performance of zio_taskq_member 2020-03-03 10:29:38 -08:00
spl-thread.c Linux 4.14, 4.19, 5.0+ compat: SIMD save/restore 2019-10-24 10:17:33 -07:00
spl-trace.c Add tracepoints for taskq entry lifetime events 2019-11-01 13:14:54 -07:00
spl-tsd.c cppcheck: (error) Uninitialized variable 2019-12-18 17:24:29 -08:00
spl-vmem.c cppcheck: (error) Uninitialized variable 2019-12-18 17:24:29 -08:00
spl-xdr.c OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
spl-zlib.c Add kmem_cache flag for forcing kvmalloc 2019-11-13 10:05:23 -08:00

README.md

The Solaris Porting Layer, SPL, is a Linux kernel module which provides a compatibility layer used by the ZFS on Linux project.

Installation

The latest version of the SPL is maintained as part of this repository. Only when building ZFS version 0.7.x or earlier must an external SPL release be used. These releases can be found at:

Release

The SPL is released under a GPLv2 license.
For more details see the NOTICE and THIRDPARTYLICENSE files; UCRL-CODE-235197