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Darrick J. Wong ac3cc25f38 vfs: fix page locking deadlocks when deduping files [ Upstream commit `edc58dd012` ] When dedupe wants to use the page cache to compare parts of two files for dedupe, we must be very careful to handle locking correctly. The current code doesn't do this. It must lock and unlock the page only once if the two pages are the same, since the overlapping range check doesn't catch this when blocksize < pagesize. If the pages are distinct but from the same file, we must observe page locking order and lock them in order of increasing offset to avoid clashing with writeback locking. Fixes: `876bec6f9b` ("vfs: refactor clone/dedupe_file_range common functions") Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Bill O'Donnell <billodo@redhat.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-09-10 10:33:47 +01:00
arch	x86/boot: Preserve boot_params.secure_boot from sanitizing	2019-09-10 10:33:40 +01:00
block	block, bfq: handle NULL return value by bfq_init_rq()	2019-08-29 08:28:46 +02:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: chacha20poly1305 - fix atomic sleep when using async algorithm	2019-07-26 09:14:19 +02:00
Documentation	x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h	2019-08-29 08:28:53 +02:00
drivers	lan78xx: Fix memory leaks	2019-09-10 10:33:47 +01:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	vfs: fix page locking deadlocks when deduping files	2019-09-10 10:33:47 +01:00
include	gpio: Fix build error of function redefinition	2019-09-10 10:33:44 +01:00
init	initramfs: free initrd memory if opening /initrd.image fails	2019-06-15 11:54:01 +02:00
ipc	ipc/mqueue.c: only perform resource calculation if user valid	2019-08-06 19:06:52 +02:00
kernel	ftrace: Check for empty hash and comment the race with registering probes	2019-09-06 10:22:13 +02:00
lib	lib: logic_pio: Add logic_pio_unregister_range()	2019-09-06 10:22:19 +02:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm/zsmalloc.c: fix build when CONFIG_COMPACTION=n	2019-09-06 10:22:08 +02:00
net	netfilter: nft_flow_offload: skip tcp rst and fin packets	2019-09-10 10:33:44 +01:00
samples	samples, bpf: suppress compiler warning	2019-07-14 08:11:04 +02:00
scripts	kbuild: Check for unknown options with cc-option usage in Kconfig and clang	2019-08-25 10:47:56 +02:00
security	selinux: fix memory leak in policydb_init()	2019-08-06 19:06:54 +02:00
sound	Revert "ASoC: Fail card instantiation if DAI format setup fails"	2019-09-06 10:22:23 +02:00
tools	tools: bpftool: fix error message (prog -> object)	2019-09-10 10:33:42 +01:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	KVM: arm/arm64: vgic-v2: Handle SGI bits in GICD_I{S,C}PENDR0 as WI	2019-09-06 10:22:22 +02:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.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	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	platform/x86: Add Intel AtomISP2 dummy / power-management driver	2019-04-20 09:16:02 +02:00
Makefile	Linux 4.19.71	2019-09-06 12:40:02 +02:00
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.