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piaojun a7fbc7f313 ocfs2: return error when we attempt to access a dirty bh in jbd2 
[ Upstream commit d984187e3a ]

We should not reuse the dirty bh in jbd2 directly due to the following
situation:

1. When removing extent rec, we will dirty the bhs of extent rec and
   truncate log at the same time, and hand them over to jbd2.

2. The bhs are submitted to jbd2 area successfully.

3. The write-back thread of device help flush the bhs to disk but
   encounter write error due to abnormal storage link.

4. After a while the storage link become normal. Truncate log flush
   worker triggered by the next space reclaiming found the dirty bh of
   truncate log and clear its 'BH_Write_EIO' and then set it uptodate in
   __ocfs2_journal_access():

   ocfs2_truncate_log_worker
     ocfs2_flush_truncate_log
       __ocfs2_flush_truncate_log
         ocfs2_replay_truncate_records
           ocfs2_journal_access_di
             __ocfs2_journal_access // here we clear io_error and set 'tl_bh' uptodata.

5. Then jbd2 will flush the bh of truncate log to disk, but the bh of
   extent rec is still in error state, and unfortunately nobody will
   take care of it.

6. At last the space of extent rec was not reduced, but truncate log
   flush worker have given it back to globalalloc. That will cause
   duplicate cluster problem which could be identified by fsck.ocfs2.

Sadly we can hardly revert this but set fs read-only in case of ruining
atomicity and consistency of space reclaim.

Link: http://lkml.kernel.org/r/5A6E8092.8090701@huawei.com
Fixes: acf8fdbe6a ("ocfs2: do not BUG if buffer not uptodate in __ocfs2_journal_access")
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Yiwen Jiang <jiangyiwen@huawei.com>
Reviewed-by: Changwei Ge <ge.changwei@h3c.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2018-04-26 11:02:14 +02:00
Documentation dm thin: fix documentation relative to low water mark threshold 2018-04-26 11:02:07 +02:00
arch x86/kvm/vmx: do not use vm-exit instruction length for fast MMIO when running nested 2018-04-26 11:02:13 +02:00
block blk-mq-debugfs: don't allow write on attributes with seq_operations set 2018-04-26 11:02:11 +02:00
certs License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crypto crypto: aes-generic - build with -Os on gcc-7+ 2018-04-12 12:32:20 +02:00
drivers gianfar: prevent integer wrapping in the rx handler 2018-04-26 11:02:13 +02:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs ocfs2: return error when we attempt to access a dirty bh in jbd2 2018-04-26 11:02:14 +02:00
include device property: Define type of PROPERTY_ENRTY_*() macros 2018-04-26 11:02:12 +02:00
init kmemcheck: stop using GFP_NOTRACK and SLAB_NOTRACK 2018-02-22 15:42:23 +01:00
ipc ipc/shm: fix use-after-free of shm file via remap_file_pages() 2018-04-24 09:36:23 +02:00
kernel ring-buffer: Check if memory is available before allocation 2018-04-24 09:36:32 +02:00
lib lib: fix stall in __bitmap_parselist() 2018-04-19 08:56:20 +02:00
mm writeback: safer lock nesting 2018-04-24 09:36:39 +02:00
net tcp_nv: fix potential integer overflow in tcpnv_acked 2018-04-26 11:02:13 +02:00
samples samples/bpf: Partially fixes the bpf.o build 2018-04-26 11:02:12 +02:00
scripts kconfig: Fix expr_free() E_NOT leak 2018-04-26 11:02:08 +02:00
security apparmor: fix resource audit messages when auditing peer 2018-04-19 08:56:18 +02:00
sound ASoC: rockchip: Use dummy_dai for rt5514 dsp dailink 2018-04-26 11:02:11 +02:00
tools bpf: test_maps: cleanup sockmaps when test ends 2018-04-26 11:02:10 +02:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt kvm: Map PFN-type memory regions as writable (if possible) 2018-04-26 11:02:13 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
…
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS dt-bindings: Document mti,mips-cpc binding 2018-03-15 10:54:35 +01:00
Makefile Linux 4.14.36 2018-04-24 09:36:40 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.