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Tim Chase 71a24c3c52 Handle compressed buffers in __dbuf_hold_impl() 
In __dbuf_hold_impl(), if a buffer is currently syncing and is still
referenced from db_data, a copy is made in case it is dirtied again in
the txg.  Previously, the buffer for the copy was simply allocated with
arc_alloc_buf() which doesn't handle compressed or encrypted buffers
(which are a special case of a compressed buffer).  The result was
typically an invalid memory access because the newly-allocated buffer
was of the uncompressed size.

This commit fixes the problem by handling the 2 compressed cases,
encrypted and unencrypted, respectively, with arc_alloc_raw_buf() and
arc_alloc_compressed_buf().

Although using the proper allocation functions fixes the invalid memory
access by allocating a buffer of the compressed size, another unrelated
issue made it impossible to properly detect compressed buffers in the
first place.  The header's compression flag was set to ZIO_COMPRESS_OFF
in arc_write() when it was possible that an attached buffer was actually
compressed.  This commit adds logic to only set ZIO_COMPRESS_OFF in
the non-ZIO_RAW case which wil handle both cases of compressed buffers
(encrypted or unencrypted).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #5742 
Closes #6797
2017-11-08 13:32:15 -08:00
.github commitcheck: Multiple OpenZFS ports in commit 2017-10-26 10:23:58 -07:00
cmd Sort output of tunables in arc_summary.py 2017-11-07 14:50:15 -08:00
config Support integration with new QAT products 2017-10-20 11:11:25 -07:00
contrib contrib/initramfs: switch to automake 2017-11-07 14:53:57 -08:00
etc Cleanup systemd dependencies 2017-11-08 09:39:15 -08:00
include Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
lib Fix column alignment with long zpool names 2017-11-05 13:09:56 -08:00
man systemd zfs-import.target and documentation 2017-10-30 13:18:26 -07:00
module Handle compressed buffers in __dbuf_hold_impl() 2017-11-08 13:32:15 -08:00
rpm Fix undefined %{systemd_svcs} in RPM scriptlets 2017-11-08 09:16:37 -08:00
scripts Fix zfs-tests.sh single test functionality 2017-11-07 14:55:31 -08:00
tests Provide tags in perf-regression.run 2017-11-07 15:06:27 -08:00
udev Fix spelling 2017-01-03 11:31:18 -06:00
.gitignore Add configure option to enable gcov analysis 2017-09-15 10:24:13 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add a missing > to AUTHORS 2014-09-02 14:18:53 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac contrib/initramfs: switch to automake 2017-11-07 14:53:57 -08:00
copy-builtin Allow c99 when building ZFS in the kernel tree 2017-03-27 12:31:15 -07:00
COPYRIGHT Encryption patch follow-up 2017-10-11 16:54:48 -04:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Correct make mancheck recipe 2017-10-27 09:52:18 -07:00
META Tag zfs-0.7.0 2017-07-26 10:13:25 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Add scan.coverity.com badge to README 2017-10-30 16:21:24 -07:00
TEST Refresh TEST file to include new variables 2017-11-08 11:09:30 -08:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

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ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.

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Official Resources

Installation

Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.

Contribute & Develop

We have a separate document with contribution guidelines.