Introduce six new properties: limit_{bw,op}_{read,write,total}.
The limit_bw_* properties limit the read, write, or combined bandwidth,
respectively, that a dataset and its descendants can consume.
Limits are applied to both file systems and ZFS volumes.
The configured limits are hierarchical, just like quotas; i.e., even if
a higher limit is configured on the child dataset, the parent's lower
limit will be enforced.
The limits are applied at the VFS level, not at the disk level.
The dataset is charged for each operation even if no disk access is
required (e.g., due to caching, compression, deduplication,
or NOP writes) or if the operation will cause more traffic (due to
the copies property, mirroring, or RAIDZ).
Read bandwidth consumption is based on:
- read-like syscalls, eg., aio_read(2), pread(2), preadv(2), read(2),
readv(2), sendfile(2)
- syscalls like getdents(2) and getdirentries(2)
- reading via mmaped files
- zfs send
Write bandwidth consumption is based on:
- write-like syscalls, eg., aio_write(2), pwrite(2), pwritev(2),
write(2), writev(2)
- writing via mmaped files
- zfs receive
The limit_op_* properties limit the read, write, or both metadata
operations, respectively, that dataset and its descendants can generate.
Read operations consumption is based on:
- read-like syscalls where the number of operations is equal to the
number of blocks being read (never less than 1)
- reading via mmaped files, where the number of operations is equal
to the number of pages being read (never less than 1)
- syscalls accessing metadata: readlink(2), stat(2)
Write operations consumption is based on:
- write-like syscalls where the number of operations is equal to the
number of blocks being written (never less than 1)
- writing via mmaped files, where the number of operations is equal
to the number of pages being written (never less than 1)
- syscalls modifing a directory's content: bind(2) (UNIX-domain
sockets), link(2), mkdir(2), mkfifo(2), mknod(2), open(2) (file
creation), rename(2), rmdir(2), symlink(2), unlink(2)
- syscalls modifing metadata: chflags(2), chmod(2), chown(2),
utimes(2)
- updating the access time of a file when reading it
Just like limit_bw_* limits, the limit_op_* limits are also
hierarchical and applied at the VFS level.
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
This change updates the documentation to refer to the project
as OpenZFS instead ZFS on Linux. Web links have been updated
to refer to https://github.com/openzfs/zfs. The extraneous
zfsonlinux.org web links in the ZED and SPL sources have been
dropped.
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#11007
Increase the minimum supported kernel version from 2.6.32 to 3.10.
This removes support for the following Linux enterprise distributions.
Distribution | Kernel | End of Life
---------------- | ------ | -------------
Ubuntu 12.04 LTS | 3.2 | Apr 28, 2017
SLES 11 | 3.0 | Mar 32, 2019
RHEL / CentOS 6 | 2.6.32 | Nov 30, 2020
The following changes were made as part of removing support.
* Updated `configure` to enforce a minimum kernel version as
specified in the META file (Linux-Minimum: 3.10).
configure: error:
*** Cannot build against kernel version 2.6.32.
*** The minimum supported kernel version is 3.10.
* Removed all `configure` kABI checks and matching C code for
interfaces which solely predate the Linux 3.10 kernel.
* Updated all `configure` kABI checks to fail when an interface is
missing which was in the 3.10 kernel up to the latest 5.1 kernel.
Removed the HAVE_* preprocessor defines for these checks and
updated the code to unconditionally use the verified interface.
* Inverted the detection logic in several kABI checks to match
the new interface as it appears in 3.10 and newer and not the
legacy interface.
* Consolidated the following checks in to individual files. Due
the large number of changes in the checks it made sense to handle
this now. It would be desirable to group other related checks in
the same fashion, but this as left as future work.
- config/kernel-blkdev.m4 - Block device kABI checks
- config/kernel-blk-queue.m4 - Block queue kABI checks
- config/kernel-bio.m4 - Bio interface kABI checks
* Removed the kABI checks for sops->nr_cached_objects() and
sops->free_cached_objects(). These interfaces are currently unused.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#9566
Move platform specific Linux headers under include/os/linux/.
Update the build system accordingly to detect the platform.
This lays some of the initial groundwork to supporting building
for other platforms.
As part of this change it was necessary to create both a user
and kernel space sys/simd.h header which can be included in
either context. No functional change, the source has been
refactored and the relevant #include's updated.
Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Matthew Macy <mmacy@FreeBSD.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#9198
Pawel Jakub Dawidek
Brian Behlendorf
Matthew Macy