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Linus Torvalds a32e236eb9 Partially revert "block: fail op_is_write() requests to read-only partitions" It turns out that commit `721c7fc701` ("block: fail op_is_write() requests to read-only partitions"), while obviously correct, causes problems for some older lvm2 installations. The reason is that the lvm snapshotting will continue to write to the snapshow COW volume, even after the volume has been marked read-only. End result: snapshot failure. This has actually been fixed in newer version of the lvm2 tool, but the old tools still exist, and the breakage was reported both in the kernel bugzilla and in the Debian bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=200439 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900442 The lvm2 fix is here https://sourceware.org/git/?p=lvm2.git;a=commit;h=a6fdb9d9d70f51c49ad11a87ab4243344e6701a3 but until everybody has updated to recent versions, we'll have to weaken the "never write to read-only partitions" check. It now allows the write to happen, but causes a warning, something like this: generic_make_request: Trying to write to read-only block-device dm-3 (partno X) Modules linked in: nf_tables xt_cgroup xt_owner kvm_intel iwlmvm kvm irqbypass iwlwifi CPU: 1 PID: 77 Comm: kworker/1:1 Not tainted 4.17.9-gentoo #3 Hardware name: LENOVO 20B6A019RT/20B6A019RT, BIOS GJET91WW (2.41 ) 09/21/2016 Workqueue: ksnaphd do_metadata RIP: 0010:generic_make_request_checks+0x4ac/0x600 ... Call Trace: generic_make_request+0x64/0x400 submit_bio+0x6c/0x140 dispatch_io+0x287/0x430 sync_io+0xc3/0x120 dm_io+0x1f8/0x220 do_metadata+0x1d/0x30 process_one_work+0x1b9/0x3e0 worker_thread+0x2b/0x3c0 kthread+0x113/0x130 ret_from_fork+0x35/0x40 Note that this is a "revert" in behavior only. I'm leaving alone the actual code cleanups in commit `721c7fc701`, but letting the previously uncaught request go through with a warning instead of stopping it. Fixes: `721c7fc701` ("block: fail op_is_write() requests to read-only partitions") Reported-and-tested-by: WGH <wgh@torlan.ru> Acked-by: Mike Snitzer <snitzer@redhat.com> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Ilya Dryomov <idryomov@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Zdenek Kabelac <zkabelac@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2018-08-04 18:19:55 -07:00
arch	Two bugfixes.	2018-08-03 13:43:59 -07:00
block	Partially revert "block: fail op_is_write() requests to read-only partitions"	2018-08-04 18:19:55 -07:00
certs	certs/blacklist: fix const confusion	2018-06-26 09:43:03 -07:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2018-07-19 07:32:44 -07:00
Documentation	Documentation: dpaa2: Use correct heading adornment	2018-08-01 09:45:57 -07:00
drivers	One bug for missing user input validation:	2018-08-03 10:49:47 -07:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	NFS client bugfixes for Linux 4.18	2018-08-03 10:42:01 -07:00
include	pci-v4.18-fixes-5	2018-08-02 10:59:19 -07:00
init	Kbuild fixes for v4.18	2018-06-30 13:05:30 -07:00
ipc	ipc/shm.c add ->pagesize function to shm_vm_ops	2018-08-02 16:03:40 -07:00
kernel	audit/stable-4.18 PR 20180731	2018-07-31 13:17:46 -07:00
lib	kasan: only select SLUB_DEBUG with SYSFS=y	2018-07-26 19:38:03 -07:00
LICENSES	LICENSES: Add Linux-OpenIB license text	2018-04-27 16:41:53 -06:00
mm	ipc/shm.c add ->pagesize function to shm_vm_ops	2018-08-02 16:03:40 -07:00
net	Revert "net/ipv6: fix metrics leak"	2018-08-01 21:32:30 -07:00
samples	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-07-18 19:32:54 -07:00
scripts	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-07-18 19:32:54 -07:00
security	selinux/stable-4.18 PR 20180629	2018-06-30 11:15:12 -07:00
sound	ALSA: hda/realtek - Yet another Clevo P950 quirk entry	2018-07-18 12:17:46 +02:00
tools	Urgent power management fixes for 4.18	2018-08-01 11:35:12 -07:00
usr	kbuild: rename built-in.o to built-in.a	2018-03-26 02:01:19 +09:00
virt	Miscellaneous bugfixes, plus a small patchlet related to Spectre v2.	2018-07-18 11:08:44 -07:00
.clang-format	clang-format: add configuration file	2018-04-11 10:28:35 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	Merge branch 'asoc-4.17' into asoc-4.18 for compress dependencies	2018-04-26 12:24:28 +01:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	MAINTAINERS/CREDITS: Drop METAG ARCHITECTURE	2018-03-05 16:34:24 +00:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: add basic helper macros to scripts/Kconfig.include	2018-05-29 03:31:19 +09:00
MAINTAINERS	ARC updates for 4.18	2018-08-02 16:52:50 -07:00
Makefile	Linux 4.18-rc7	2018-07-29 14:44:52 -07:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.