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Matthew Ahrens f8c0d7e1f6
fix abd_nr_pages_off for gang abd 
`__vdev_disk_physio()` uses `abd_nr_pages_off()` to allocate a bio with
a sufficient number of iovec's to process this zio (i.e.
`nr_iovecs`/`bi_max_vecs`).  If there are not enough iovec's in the bio,
then additional bio's will be allocated.  However, this is a sub-optimal
code path.  In particular, it requires several abd calls (to
`abd_nr_pages_off()` and `abd_bio_map_off()`) which will have to walk
the constituents of the ABD (the pages or the gang children) because
they are looking for offsets > 0.

For gang ABD's, `abd_nr_pages_off()` returns the number of iovec's
needed for the first constituent, rather than the sum of all
constituents (within the requested range).  This always under-estimates
the required number of iovec's, which causes us to always need several
bio's.  The end result is that `__vdev_disk_physio()` is usually O(n^2)
for gang ABD's (and occasionally O(n^3), when more than 16 bio's are
needed).

This commit fixes `abd_nr_pages_off()`'s handling of gang ABD's, to
correctly determine how many iovec's are needed, by adding up the number
of iovec's for each of the gang children in the requested range.

Reviewed-by: Mark Maybee <mark.maybee@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #11536
2021-01-28 09:28:20 -08:00
.github Forward questions to github discussions 2020-12-21 20:09:02 -08:00
cmd Add zdb -r <dataset> <object-id | file> <output> 2021-01-27 21:36:01 -08:00
config cppcheck: integrete cppcheck 2021-01-26 16:12:26 -08:00
contrib dracut: Fix race condition between load-key and import 2021-01-26 12:14:22 -08:00
etc Verify zfs module loaded before starting services 2020-11-28 11:11:18 -08:00
include Parallelize vdev_validate 2021-01-26 19:36:51 -08:00
lib Fix a resource leak in uu_avl_pool_destroy 2021-01-26 19:39:28 -08:00
man Add zdb -r <dataset> <object-id | file> <output> 2021-01-27 21:36:01 -08:00
module fix abd_nr_pages_off for gang abd 2021-01-28 09:28:20 -08:00
rpm Install zgenhostid to sbindir 2021-01-21 12:58:24 -08:00
scripts DKMS: Disable weak modules 2020-12-15 09:22:30 -08:00
tests Add zdb -r <dataset> <object-id | file> <output> 2021-01-27 21:36:01 -08:00
udev Centralize variable substitution 2020-07-14 17:33:44 -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 Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add zstd support to zfs 2020-08-20 10:30:06 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
configure.ac Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
copy-builtin 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
Makefile.am cppcheck: integrete cppcheck 2021-01-26 16:12:26 -08:00
META Linux 5.10 compat: META 2020-12-23 08:55:02 -08:00
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 docs: update README's installation link 2020-10-08 09:33:53 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -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 12-STABLE and 13-CURRENT.