| Commit message (Collapse) | Author | Age | Files | Lines |
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These macros have not been used for awhile now.
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
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Conflicts:
arch/powerpc/platforms/pseries/hvCall.S
include/linux/percpu.h
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* 'limits_cleanup' of git://decibel.fi.muni.cz/~xslaby/linux:
resource: add helpers for fetching rlimits
resource: move kernel function inside __KERNEL__
SECURITY: selinux, fix update_rlimit_cpu parameter
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We want to be sure that compiler fetches the limit variable only
once, so add helpers for fetching current and maximal resource
limits which do that.
Add them to sched.h (instead of resource.h) due to circular dependency
sched.h->resource.h->task_struct
Alternative would be to create a separate res_access.h or similar.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: James Morris <jmorris@namei.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
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It is an internal function. Move it inside __KERNEL__ ifdef, along
with task_struct declaration.
Then we get:
--- /usr/include/linux/resource.h 2009-09-14 15:09:29.000000000 +0200
+++ usr/include/linux/resource.h 2010-01-04 11:30:54.000000000 +0100
@@ -3,8 +3,6 @@
#include <linux/time.h>
-struct task_struct;
-
/*
* Resource control/accounting header file for linux
*/
@@ -70,6 +68,5 @@
*/
#include <asm/resource.h>
-int getrusage(struct task_struct *p, int who, struct rusage *ru);
#endif
***********
include/linux/Kbuild is untouched, since unifdef is run even on
headers-y nowadays.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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Don't pass current RLIMIT_RTTIME to update_rlimit_cpu() in
selinux_bprm_committing_creds, since update_rlimit_cpu expects
RLIMIT_CPU limit.
Use proper rlim[RLIMIT_CPU].rlim_cur instead to fix that.
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: James Morris <jmorris@namei.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Eric Paris <eparis@parisplace.org>
Cc: David Howells <dhowells@redhat.com>
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* 'for-linus/samsung' of git://git.fluff.org/bjdooks/linux:
ARM: S3C: Fix NAND device registration by s3c_nand_set_platdata().
ARM: S3C24XX: touchscreen device definition
ARM: mach-bast: add NAND_SCAN_SILENT_NODEV to optional devices
ARM: mach-osiris: add NAND_SCAN_SILENT_NODEV to optional devices
ARM: S3C24XX: touchscreen device definition
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Merge branch 's3c24xx-updates2' into for-linus/samsung
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Add definition for the touchscreen driver platform data and initial
support for the H1940 machine.
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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Merge branch 'next-simtec' into for-linus/samsung
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Fix two bugs in s3c_nand_set_platdata() where thet device's platform
data was not set, and the wrong error check was being performed on
the return of s3c_nand_copy_set().
Fixes the following OOPS:
Unable to handle kernel NULL pointer dereference at virtual address 00000004
PC is at s3c24xx_nand_probe+0x234/0x594
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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Add definition for the touchscreen driver platform data and initial
support for the H1940 machine.
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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Add the NAND_SCAN_SILENT_NODEV to the optional NAND devices that may not
be fitted to the board
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Simtec Linux Team <linux@simtec.co.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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Add the NAND_SCAN_SILENT_NODEV to the optional NAND devices that may not
be fitted to the board
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Simtec Linux Team <linux@simtec.co.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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Holding locks over device_del -> kobject_del -> sysfs_deactivate can
cause deadlocks if those same locks are grabbed in sysfs show or store
methods.
The I model s_active count + completion as a sleeping read/write lock.
I describe to lockdep sysfs_get_active as a read_trylock,
sysfs_put_active as a read_unlock, and sysfs_deactivate as a
write_lock and write_unlock pair. This seems to capture the essence
for purposes of finding deadlocks, and in my testing gives finds real
issues and ignores non-issues.
This brings us back to holding locks over kobject_del is a problem
that ideally we should find a way of addressing, but at least lockdep
can tell us about the problems instead of requiring developers to debug
rare strange system deadlocks, that happen when sysfs files are removed
while being written to.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We kill the guest, but then we blatt random stuff.
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
[S390] Update default configuration.
[S390] Have param.h simply include <asm-generic/param.h>.
[S390] qdio: convert global statistics to per-device stats
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Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Since the files have identical content, might as well simplify.
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Revamp the qdio performance statistics and move them from procfs to
debugfs using the seq_file interface. Since the statistics are not
intended for the general user the removal of /proc/qdio_perf should
not surprise anyone.
The per device statistics are disabled by default, writing 1 to
/<debugfs mountpoint>/qdio/<device bus ID>/statistics enables the
statistics for the given device.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
* 'sh/for-2.6.33' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
binfmt_elf_fdpic: Fix build breakage introduced by coredump changes.
sh: update defconfigs.
sh: Don't default enable PMB support.
sh: Disable PMB for SH4AL-DSP CPUs.
sh: Only provide a PCLK definition for legacy CPG CPUs.
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Commit f6151dfea21496d43dbaba32cfcd9c9f404769bc introduces build
breakage, so this patch fixes it together with some printk formatting
cleanup.
Signed-off-by: Daisuke HATAYAMA <d.hatayama@jp.fujitsu.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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This has the adverse effect of converting many 29bit configs to 32bit
mode, while this is a change that needs to be done manually for each
platform. Turn it off by default in order to cut down on spurious bug
reports.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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While the PMB is available on SH-4A parts, SH4AL-DSP parts exclude it
altogether. As such, explicitly disable PMB support for these parts. If
this changes in the future for newer subtypes, this will have to be made
more fine-grained.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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As CPUs are migrated over to more fully-featured clock frameworks of
their own and off of the legacy CPG code, they no longer have any real
need for defining the PCLK value. The PCLK define in itself is already
fairly misleading, as many boards get their input clocks from different
sources, making this value fairly arbitrary anyways.
Outside of the legacy CPG clock framework, the only place where this
value is used is for deriving CLOCK_TICK_RATE, which we set back to the
legacy PIT value that it was before the PCLK definitions were added in
the first place.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
ext4: Calculate metadata requirements more accurately
ext4: Fix accounting of reserved metadata blocks
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In the past, ext4_calc_metadata_amount(), and its sub-functions
ext4_ext_calc_metadata_amount() and ext4_indirect_calc_metadata_amount()
badly over-estimated the number of metadata blocks that might be
required for delayed allocation blocks. This didn't matter as much
when functions which managed the reserved metadata blocks were more
aggressive about dropping reserved metadata blocks as delayed
allocation blocks were written, but unfortunately they were too
aggressive. This was fixed in commit 0637c6f, but as a result the
over-estimation by ext4_calc_metadata_amount() would lead to reserving
2-3 times the number of pending delayed allocation blocks as
potentially required metadata blocks. So if there are 1 megabytes of
blocks which have been not yet been allocation, up to 3 megabytes of
space would get reserved out of the user's quota and from the file
system free space pool until all of the inode's data blocks have been
allocated.
This commit addresses this problem by much more accurately estimating
the number of metadata blocks that will be required. It will still
somewhat over-estimate the number of blocks needed, since it must make
a worst case estimate not knowing which physical blocks will be
needed, but it is much more accurate than before.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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Commit 0637c6f had a typo which caused the reserved metadata blocks to
not be released correctly. Fix this.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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We wrap the smm calls and other bits with the BKL push down as a
precaution but they can probably go
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Nobody seems to want to own I2O patches so sending this one directly.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The BKL is in this function because of the BKL pushdown (see commit
f8f2c79d594463427f7114cedb1555110d547d89)
It is not needed here because the mutex_lock sonypi_device.lock provides
the necessary locking.
sonypi_misc_ioctl can be converted to unlocked ioctls since it relies on
its own locking (the mutex sonypi_device.lock) and not the bkl
Document that llseek is not needed by explictly setting it to no_llseek
LKML-Reference: <alpine.LFD.2.00.0910192019420.3563@localhost.localdomain>
Signed-off-by: John Kacur <jkacur@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2:
nilfs2: update mailing list address
nilfs2: Storage class should be before const qualifier
nilfs2: trivial coding style fix
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This replaces the list address for nilfs discussion to linux-nilfs at
vger.kernel.org from users at nilfs.org.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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The C99 specification states in section 6.11.5:
The placement of a storage-class specifier other than at the beginning
of the declaration specifiers in a declaration is an obsolescent
feature.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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This is a trivial style fix patch to mend errors/warnings
reported by "checkpatch.pl --file".
Signed-off-by: Jiro SEKIBA <jir@unicus.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing
* 'reiserfs/kill-bkl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing:
reiserfs: Safely acquire i_mutex from xattr_rmdir
reiserfs: Safely acquire i_mutex from reiserfs_for_each_xattr
reiserfs: Fix journal mutex <-> inode mutex lock inversion
reiserfs: Fix unwanted recursive reiserfs lock in reiserfs_unlink()
reiserfs: Relax lock before open xattr dir in reiserfs_xattr_set_handle()
reiserfs: Relax reiserfs lock while freeing the journal
reiserfs: Fix reiserfs lock <-> i_mutex dependency inversion on xattr
reiserfs: Warn on lock relax if taken recursively
reiserfs: Fix reiserfs lock <-> i_xattr_sem dependency inversion
reiserfs: Fix remaining in-reclaim-fs <-> reclaim-fs-on locking inversion
reiserfs: Fix reiserfs lock <-> inode mutex dependency inversion
reiserfs: Fix reiserfs lock and journal lock inversion dependency
reiserfs: Fix possible recursive lock
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Relax the reiserfs lock before taking the inode mutex from
xattr_rmdir() to avoid the usual reiserfs lock <-> inode mutex
bad dependency.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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Relax the reiserfs lock before taking the inode mutex from
reiserfs_for_each_xattr() to avoid the usual bad dependencies:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-atom #179
-------------------------------------------------------
rm/3242 is trying to acquire lock:
(&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c11428ef>] reiserfs_for_each_xattr+0x23f/0x290
but task is already holding lock:
(&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143389>] reiserfs_write_lock+0x29/0x40
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401aab>] mutex_lock_nested+0x5b/0x340
[<c1143339>] reiserfs_write_lock_once+0x29/0x50
[<c1117022>] reiserfs_lookup+0x62/0x140
[<c10bd85f>] __lookup_hash+0xef/0x110
[<c10bf21d>] lookup_one_len+0x8d/0xc0
[<c1141e3a>] open_xa_dir+0xea/0x1b0
[<c1142720>] reiserfs_for_each_xattr+0x70/0x290
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #0 (&sb->s_type->i_mutex_key#4/3){+.+.+.}:
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401aab>] mutex_lock_nested+0x5b/0x340
[<c11428ef>] reiserfs_for_each_xattr+0x23f/0x290
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
other info that might help us debug this:
1 lock held by rm/3242:
#0: (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143389>] reiserfs_write_lock+0x29/0x40
stack backtrace:
Pid: 3242, comm: rm Not tainted 2.6.32-atom #179
Call Trace:
[<c13ffa13>] ? printk+0x18/0x1a
[<c105d33a>] print_circular_bug+0xca/0xd0
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105c932>] ? mark_held_locks+0x62/0x80
[<c105cc3b>] ? trace_hardirqs_on+0xb/0x10
[<c1401098>] ? mutex_unlock+0x8/0x10
[<c105f2c8>] lock_acquire+0x68/0x90
[<c11428ef>] ? reiserfs_for_each_xattr+0x23f/0x290
[<c11428ef>] ? reiserfs_for_each_xattr+0x23f/0x290
[<c1401aab>] mutex_lock_nested+0x5b/0x340
[<c11428ef>] ? reiserfs_for_each_xattr+0x23f/0x290
[<c11428ef>] reiserfs_for_each_xattr+0x23f/0x290
[<c1143180>] ? delete_one_xattr+0x0/0x100
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c1143339>] ? reiserfs_write_lock_once+0x29/0x50
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c11b0d4f>] ? _atomic_dec_and_lock+0x4f/0x70
[<c111e990>] ? reiserfs_delete_inode+0x0/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c1401098>] ? mutex_unlock+0x8/0x10
[<c10c3e0d>] ? vfs_readdir+0x7d/0xb0
[<c10c3af0>] ? filldir64+0x0/0xf0
[<c1002ef3>] ? sysenter_exit+0xf/0x16
[<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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We need to relax the reiserfs lock before locking the inode mutex
from xattr_unlink(), otherwise we'll face the usual bad dependencies:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-atom #178
-------------------------------------------------------
rm/3202 is trying to acquire lock:
(&journal->j_mutex){+.+...}, at: [<c113c234>] do_journal_begin_r+0x94/0x360
but task is already holding lock:
(&sb->s_type->i_mutex_key#4/2){+.+...}, at: [<c1142a67>] xattr_unlink+0x57/0xb0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&sb->s_type->i_mutex_key#4/2){+.+...}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c1142a67>] xattr_unlink+0x57/0xb0
[<c1143179>] delete_one_xattr+0x29/0x100
[<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c1143359>] reiserfs_write_lock+0x29/0x40
[<c113c23c>] do_journal_begin_r+0x9c/0x360
[<c113c680>] journal_begin+0x80/0x130
[<c1127363>] reiserfs_remount+0x223/0x4e0
[<c10b6dd6>] do_remount_sb+0xa6/0x140
[<c10ce6a0>] do_mount+0x560/0x750
[<c10ce914>] sys_mount+0x84/0xb0
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #0 (&journal->j_mutex){+.+...}:
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c113c234>] do_journal_begin_r+0x94/0x360
[<c113c680>] journal_begin+0x80/0x130
[<c1116d63>] reiserfs_unlink+0x83/0x2e0
[<c1142a74>] xattr_unlink+0x64/0xb0
[<c1143179>] delete_one_xattr+0x29/0x100
[<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
other info that might help us debug this:
2 locks held by rm/3202:
#0: (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c114274b>] reiserfs_for_each_xattr+0x9b/0x290
#1: (&sb->s_type->i_mutex_key#4/2){+.+...}, at: [<c1142a67>] xattr_unlink+0x57/0xb0
stack backtrace:
Pid: 3202, comm: rm Not tainted 2.6.32-atom #178
Call Trace:
[<c13ff9e3>] ? printk+0x18/0x1a
[<c105d33a>] print_circular_bug+0xca/0xd0
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c1142a67>] ? xattr_unlink+0x57/0xb0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c113c234>] ? do_journal_begin_r+0x94/0x360
[<c113c234>] ? do_journal_begin_r+0x94/0x360
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c113c234>] ? do_journal_begin_r+0x94/0x360
[<c113c234>] do_journal_begin_r+0x94/0x360
[<c10411b6>] ? run_timer_softirq+0x1a6/0x220
[<c103cb00>] ? __do_softirq+0x50/0x140
[<c113c680>] journal_begin+0x80/0x130
[<c103cba2>] ? __do_softirq+0xf2/0x140
[<c104f72f>] ? hrtimer_interrupt+0xdf/0x220
[<c1116d63>] reiserfs_unlink+0x83/0x2e0
[<c105c932>] ? mark_held_locks+0x62/0x80
[<c11b8d08>] ? trace_hardirqs_on_thunk+0xc/0x10
[<c1002fd8>] ? restore_all_notrace+0x0/0x18
[<c1142a67>] ? xattr_unlink+0x57/0xb0
[<c1142a74>] xattr_unlink+0x64/0xb0
[<c1143179>] delete_one_xattr+0x29/0x100
[<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
[<c1143150>] ? delete_one_xattr+0x0/0x100
[<c1401cb9>] ? mutex_lock_nested+0x299/0x340
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c1143309>] ? reiserfs_write_lock_once+0x29/0x50
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c11b0d1f>] ? _atomic_dec_and_lock+0x4f/0x70
[<c111e990>] ? reiserfs_delete_inode+0x0/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c1401068>] ? mutex_unlock+0x8/0x10
[<c10c3e0d>] ? vfs_readdir+0x7d/0xb0
[<c10c3af0>] ? filldir64+0x0/0xf0
[<c1002ef3>] ? sysenter_exit+0xf/0x16
[<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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reiserfs_unlink() may or may not be called under the reiserfs
lock.
But it also takes the reiserfs lock and can then acquire it
recursively which leads to do_journal_begin_r() that fails to
relax the reiserfs lock before grabbing the journal mutex,
creating an unexpected lock inversion.
We need to ensure reiserfs_unlink() won't get the reiserfs lock
recursively using reiserfs_write_lock_once().
This fixes the following warning that precedes a lock inversion
report (reiserfs lock <-> journal mutex).
------------[ cut here ]------------
WARNING: at fs/reiserfs/lock.c:95 reiserfs_lock_check_recursive+0x3a/0x50()
Hardware name: MS-7418
Unwanted recursive reiserfs lock!
Pid: 3208, comm: dbench Not tainted 2.6.32-atom #177
Call Trace:
[<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
[<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
[<c10373a7>] warn_slowpath_common+0x67/0xc0
[<c114327a>] ? reiserfs_lock_check_recursive+0x3a/0x50
[<c1037446>] warn_slowpath_fmt+0x26/0x30
[<c114327a>] reiserfs_lock_check_recursive+0x3a/0x50
[<c113c213>] do_journal_begin_r+0x83/0x360
[<c105eb16>] ? __lock_acquire+0x1296/0x19e0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c113c670>] journal_begin+0x80/0x130
[<c1116d5d>] reiserfs_unlink+0x7d/0x2d0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c1142a57>] ? xattr_unlink+0x57/0xb0
[<c1142a64>] xattr_unlink+0x64/0xb0
[<c1143169>] delete_one_xattr+0x29/0x100
[<c11427ab>] reiserfs_for_each_xattr+0x10b/0x290
[<c1143140>] ? delete_one_xattr+0x0/0x100
[<c1401ca9>] ? mutex_lock_nested+0x299/0x340
[<c11429aa>] reiserfs_delete_xattrs+0x1a/0x60
[<c11432f9>] ? reiserfs_write_lock_once+0x29/0x50
[<c111ea1f>] reiserfs_delete_inode+0x9f/0x150
[<c11b0d0f>] ? _atomic_dec_and_lock+0x4f/0x70
[<c111e980>] ? reiserfs_delete_inode+0x0/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10505c6>] ? up_read+0x16/0x30
[<c1022ab7>] ? do_page_fault+0x187/0x330
[<c1002fd8>] ? restore_all_notrace+0x0/0x18
[<c1022930>] ? do_page_fault+0x0/0x330
[<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10c0a00>] sys_unlink+0x10/0x20
[<c1002ec4>] sysenter_do_call+0x12/0x32
---[ end trace 2e35d71a6cc69d0c ]---
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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We call xattr_lookup() from reiserfs_xattr_get(). We then hold
the reiserfs lock when we grab the i_mutex. But later, we may
relax the reiserfs lock, creating dependency inversion between
both locks.
The lookups and creation jobs ar already protected by the
inode mutex, so we can safely relax the reiserfs lock, dropping
the unwanted reiserfs lock -> i_mutex dependency, as shown
in the following lockdep report:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-atom #173
-------------------------------------------------------
cp/3204 is trying to acquire lock:
(&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
but task is already holding lock:
(&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#4/3){+.+.+.}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a2b>] mutex_lock_nested+0x5b/0x340
[<c1141d83>] open_xa_dir+0x43/0x1b0
[<c1142722>] reiserfs_for_each_xattr+0x62/0x260
[<c114299a>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea1f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0a00>] sys_unlink+0x10/0x20
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a2b>] mutex_lock_nested+0x5b/0x340
[<c11432b9>] reiserfs_write_lock_once+0x29/0x50
[<c1117012>] reiserfs_lookup+0x62/0x140
[<c10bd85f>] __lookup_hash+0xef/0x110
[<c10bf21d>] lookup_one_len+0x8d/0xc0
[<c1141e2a>] open_xa_dir+0xea/0x1b0
[<c1141fe5>] xattr_lookup+0x15/0x160
[<c1142476>] reiserfs_xattr_get+0x56/0x2a0
[<c1144042>] reiserfs_get_acl+0xa2/0x360
[<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
[<c111789c>] reiserfs_mkdir+0x6c/0x2c0
[<c10bea96>] vfs_mkdir+0xd6/0x180
[<c10c0c10>] sys_mkdirat+0xc0/0xd0
[<c10c0c40>] sys_mkdir+0x20/0x30
[<c1002ec4>] sysenter_do_call+0x12/0x32
other info that might help us debug this:
2 locks held by cp/3204:
#0: (&sb->s_type->i_mutex_key#4/1){+.+.+.}, at: [<c10bd8d6>] lookup_create+0x26/0xa0
#1: (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
stack backtrace:
Pid: 3204, comm: cp Not tainted 2.6.32-atom #173
Call Trace:
[<c13ff993>] ? printk+0x18/0x1a
[<c105d33a>] print_circular_bug+0xca/0xd0
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105d3aa>] ? check_usage+0x6a/0x460
[<c105f2c8>] lock_acquire+0x68/0x90
[<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
[<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
[<c1401a2b>] mutex_lock_nested+0x5b/0x340
[<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
[<c11432b9>] reiserfs_write_lock_once+0x29/0x50
[<c1117012>] reiserfs_lookup+0x62/0x140
[<c105ccca>] ? debug_check_no_locks_freed+0x8a/0x140
[<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10bd85f>] __lookup_hash+0xef/0x110
[<c10bf21d>] lookup_one_len+0x8d/0xc0
[<c1141e2a>] open_xa_dir+0xea/0x1b0
[<c1141fe5>] xattr_lookup+0x15/0x160
[<c1142476>] reiserfs_xattr_get+0x56/0x2a0
[<c1144042>] reiserfs_get_acl+0xa2/0x360
[<c10ca2e7>] ? new_inode+0x27/0xa0
[<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
[<c1402eb7>] ? _spin_unlock+0x27/0x40
[<c111789c>] reiserfs_mkdir+0x6c/0x2c0
[<c10c7cb8>] ? __d_lookup+0x108/0x190
[<c105c932>] ? mark_held_locks+0x62/0x80
[<c1401c8d>] ? mutex_lock_nested+0x2bd/0x340
[<c10bd17a>] ? generic_permission+0x1a/0xa0
[<c11788fe>] ? security_inode_permission+0x1e/0x20
[<c10bea96>] vfs_mkdir+0xd6/0x180
[<c10c0c10>] sys_mkdirat+0xc0/0xd0
[<c10505c6>] ? up_read+0x16/0x30
[<c1002fd8>] ? restore_all_notrace+0x0/0x18
[<c10c0c40>] sys_mkdir+0x20/0x30
[<c1002ec4>] sysenter_do_call+0x12/0x32
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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Keeping the reiserfs lock while freeing the journal on
umount path triggers a lock inversion between bdev->bd_mutex
and the reiserfs lock.
We don't need the reiserfs lock at this stage. The filesystem
is not usable anymore, and there are no more pending commits,
everything got flushed (even this operation was done in parallel
and didn't required the reiserfs lock from the current process).
This fixes the following lockdep report:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-atom #172
-------------------------------------------------------
umount/3904 is trying to acquire lock:
(&bdev->bd_mutex){+.+.+.}, at: [<c10de2c2>] __blkdev_put+0x22/0x160
but task is already holding lock:
(&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143279>] reiserfs_write_lock+0x29/0x40
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c140199b>] mutex_lock_nested+0x5b/0x340
[<c1143229>] reiserfs_write_lock_once+0x29/0x50
[<c111c485>] reiserfs_get_block+0x85/0x1620
[<c10e1040>] do_mpage_readpage+0x1f0/0x6d0
[<c10e1640>] mpage_readpages+0xc0/0x100
[<c1119b89>] reiserfs_readpages+0x19/0x20
[<c108f1ec>] __do_page_cache_readahead+0x1bc/0x260
[<c108f2b8>] ra_submit+0x28/0x40
[<c1087e3e>] filemap_fault+0x40e/0x420
[<c109b5fd>] __do_fault+0x3d/0x430
[<c109d47e>] handle_mm_fault+0x12e/0x790
[<c1022a65>] do_page_fault+0x135/0x330
[<c1403663>] error_code+0x6b/0x70
[<c10ef9ca>] load_elf_binary+0x82a/0x1a10
[<c10ba130>] search_binary_handler+0x90/0x1d0
[<c10bb70f>] do_execve+0x1df/0x250
[<c1001746>] sys_execve+0x46/0x70
[<c1002fa5>] syscall_call+0x7/0xb
-> #2 (&mm->mmap_sem){++++++}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c109b1ab>] might_fault+0x8b/0xb0
[<c11b8f52>] copy_to_user+0x32/0x70
[<c10c3b94>] filldir64+0xa4/0xf0
[<c1109116>] sysfs_readdir+0x116/0x210
[<c10c3e1d>] vfs_readdir+0x8d/0xb0
[<c10c3ea9>] sys_getdents64+0x69/0xb0
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #1 (sysfs_mutex){+.+.+.}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c140199b>] mutex_lock_nested+0x5b/0x340
[<c110951c>] sysfs_addrm_start+0x2c/0xb0
[<c1109aa0>] create_dir+0x40/0x90
[<c1109b1b>] sysfs_create_dir+0x2b/0x50
[<c11b2352>] kobject_add_internal+0xc2/0x1b0
[<c11b2531>] kobject_add_varg+0x31/0x50
[<c11b25ac>] kobject_add+0x2c/0x60
[<c1258294>] device_add+0x94/0x560
[<c11036ea>] add_partition+0x18a/0x2a0
[<c110418a>] rescan_partitions+0x33a/0x450
[<c10de5bf>] __blkdev_get+0x12f/0x2d0
[<c10de76a>] blkdev_get+0xa/0x10
[<c11034b8>] register_disk+0x108/0x130
[<c11a87a9>] add_disk+0xd9/0x130
[<c12998e5>] sd_probe_async+0x105/0x1d0
[<c10528af>] async_thread+0xcf/0x230
[<c104bfd4>] kthread+0x74/0x80
[<c1003aab>] kernel_thread_helper+0x7/0x3c
-> #0 (&bdev->bd_mutex){+.+.+.}:
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c140199b>] mutex_lock_nested+0x5b/0x340
[<c10de2c2>] __blkdev_put+0x22/0x160
[<c10de40a>] blkdev_put+0xa/0x10
[<c113ce22>] free_journal_ram+0xd2/0x130
[<c113ea18>] do_journal_release+0x98/0x190
[<c113eb2a>] journal_release+0xa/0x10
[<c1128eb6>] reiserfs_put_super+0x36/0x130
[<c10b776f>] generic_shutdown_super+0x4f/0xe0
[<c10b7825>] kill_block_super+0x25/0x40
[<c11255df>] reiserfs_kill_sb+0x7f/0x90
[<c10b7f4a>] deactivate_super+0x7a/0x90
[<c10cccd8>] mntput_no_expire+0x98/0xd0
[<c10ccfcc>] sys_umount+0x4c/0x310
[<c10cd2a9>] sys_oldumount+0x19/0x20
[<c1002ec4>] sysenter_do_call+0x12/0x32
other info that might help us debug this:
2 locks held by umount/3904:
#0: (&type->s_umount_key#30){+++++.}, at: [<c10b7f45>] deactivate_super+0x75/0x90
#1: (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1143279>] reiserfs_write_lock+0x29/0x40
stack backtrace:
Pid: 3904, comm: umount Not tainted 2.6.32-atom #172
Call Trace:
[<c13ff903>] ? printk+0x18/0x1a
[<c105d33a>] print_circular_bug+0xca/0xd0
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c108b66f>] ? free_pcppages_bulk+0x1f/0x250
[<c105f2c8>] lock_acquire+0x68/0x90
[<c10de2c2>] ? __blkdev_put+0x22/0x160
[<c10de2c2>] ? __blkdev_put+0x22/0x160
[<c140199b>] mutex_lock_nested+0x5b/0x340
[<c10de2c2>] ? __blkdev_put+0x22/0x160
[<c105c932>] ? mark_held_locks+0x62/0x80
[<c10afe12>] ? kfree+0x92/0xd0
[<c10de2c2>] __blkdev_put+0x22/0x160
[<c105cc3b>] ? trace_hardirqs_on+0xb/0x10
[<c10de40a>] blkdev_put+0xa/0x10
[<c113ce22>] free_journal_ram+0xd2/0x130
[<c113ea18>] do_journal_release+0x98/0x190
[<c113eb2a>] journal_release+0xa/0x10
[<c1128eb6>] reiserfs_put_super+0x36/0x130
[<c1050596>] ? up_write+0x16/0x30
[<c10b776f>] generic_shutdown_super+0x4f/0xe0
[<c10b7825>] kill_block_super+0x25/0x40
[<c10f41e0>] ? vfs_quota_off+0x0/0x20
[<c11255df>] reiserfs_kill_sb+0x7f/0x90
[<c10b7f4a>] deactivate_super+0x7a/0x90
[<c10cccd8>] mntput_no_expire+0x98/0xd0
[<c10ccfcc>] sys_umount+0x4c/0x310
[<c10cd2a9>] sys_oldumount+0x19/0x20
[<c1002ec4>] sysenter_do_call+0x12/0x32
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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While deleting the xattrs of an inode, we hold the reiserfs lock
and grab the inode->i_mutex of the targeted inode and the root
private xattr directory.
Later on, we may relax the reiserfs lock for various reasons, this
creates inverted dependencies.
We can remove the reiserfs lock -> i_mutex dependency by relaxing
the former before calling open_xa_dir(). This is fine because the
lookup and creation of xattr private directories done in
open_xa_dir() are covered by the targeted inode mutexes. And deeper
operations in the tree are still done under the write lock.
This fixes the following lockdep report:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-atom #173
-------------------------------------------------------
cp/3204 is trying to acquire lock:
(&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11432b9>] reiserfs_write_lock_once+0x29/0x50
but task is already holding lock:
(&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#4/3){+.+.+.}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a2b>] mutex_lock_nested+0x5b/0x340
[<c1141d83>] open_xa_dir+0x43/0x1b0
[<c1142722>] reiserfs_for_each_xattr+0x62/0x260
[<c114299a>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea1f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0a00>] sys_unlink+0x10/0x20
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a2b>] mutex_lock_nested+0x5b/0x340
[<c11432b9>] reiserfs_write_lock_once+0x29/0x50
[<c1117012>] reiserfs_lookup+0x62/0x140
[<c10bd85f>] __lookup_hash+0xef/0x110
[<c10bf21d>] lookup_one_len+0x8d/0xc0
[<c1141e2a>] open_xa_dir+0xea/0x1b0
[<c1141fe5>] xattr_lookup+0x15/0x160
[<c1142476>] reiserfs_xattr_get+0x56/0x2a0
[<c1144042>] reiserfs_get_acl+0xa2/0x360
[<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
[<c111789c>] reiserfs_mkdir+0x6c/0x2c0
[<c10bea96>] vfs_mkdir+0xd6/0x180
[<c10c0c10>] sys_mkdirat+0xc0/0xd0
[<c10c0c40>] sys_mkdir+0x20/0x30
[<c1002ec4>] sysenter_do_call+0x12/0x32
other info that might help us debug this:
2 locks held by cp/3204:
#0: (&sb->s_type->i_mutex_key#4/1){+.+.+.}, at: [<c10bd8d6>] lookup_create+0x26/0xa0
#1: (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c1141e18>] open_xa_dir+0xd8/0x1b0
stack backtrace:
Pid: 3204, comm: cp Not tainted 2.6.32-atom #173
Call Trace:
[<c13ff993>] ? printk+0x18/0x1a
[<c105d33a>] print_circular_bug+0xca/0xd0
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105d3aa>] ? check_usage+0x6a/0x460
[<c105f2c8>] lock_acquire+0x68/0x90
[<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
[<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
[<c1401a2b>] mutex_lock_nested+0x5b/0x340
[<c11432b9>] ? reiserfs_write_lock_once+0x29/0x50
[<c11432b9>] reiserfs_write_lock_once+0x29/0x50
[<c1117012>] reiserfs_lookup+0x62/0x140
[<c105ccca>] ? debug_check_no_locks_freed+0x8a/0x140
[<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10bd85f>] __lookup_hash+0xef/0x110
[<c10bf21d>] lookup_one_len+0x8d/0xc0
[<c1141e2a>] open_xa_dir+0xea/0x1b0
[<c1141fe5>] xattr_lookup+0x15/0x160
[<c1142476>] reiserfs_xattr_get+0x56/0x2a0
[<c1144042>] reiserfs_get_acl+0xa2/0x360
[<c10ca2e7>] ? new_inode+0x27/0xa0
[<c114461a>] reiserfs_cache_default_acl+0x3a/0x160
[<c1402eb7>] ? _spin_unlock+0x27/0x40
[<c111789c>] reiserfs_mkdir+0x6c/0x2c0
[<c10c7cb8>] ? __d_lookup+0x108/0x190
[<c105c932>] ? mark_held_locks+0x62/0x80
[<c1401c8d>] ? mutex_lock_nested+0x2bd/0x340
[<c10bd17a>] ? generic_permission+0x1a/0xa0
[<c11788fe>] ? security_inode_permission+0x1e/0x20
[<c10bea96>] vfs_mkdir+0xd6/0x180
[<c10c0c10>] sys_mkdirat+0xc0/0xd0
[<c10505c6>] ? up_read+0x16/0x30
[<c1002fd8>] ? restore_all_notrace+0x0/0x18
[<c10c0c40>] sys_mkdir+0x20/0x30
[<c1002ec4>] sysenter_do_call+0x12/0x32
v2: Don't drop reiserfs_mutex_lock_nested_safe() as we'll still
need it later
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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When we relax the reiserfs lock to avoid creating unwanted
dependencies against others locks while grabbing these,
we want to ensure it has not been taken recursively, otherwise
the lock won't be really relaxed. Only its depth will be decreased.
The unwanted dependency would then actually happen.
To prevent from that, add a reiserfs_lock_check_recursive() call
in the places that need it.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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i_xattr_sem depends on the reiserfs lock. But after we grab
i_xattr_sem, we may relax/relock the reiserfs lock while waiting
on a freezed filesystem, creating a dependency inversion between
the two locks.
In order to avoid the i_xattr_sem -> reiserfs lock dependency, let's
create a reiserfs_down_read_safe() that acts like
reiserfs_mutex_lock_safe(): relax the reiserfs lock while grabbing
another lock to avoid undesired dependencies induced by the
heivyweight reiserfs lock.
This fixes the following warning:
[ 990.005931] =======================================================
[ 990.012373] [ INFO: possible circular locking dependency detected ]
[ 990.013233] 2.6.33-rc1 #1
[ 990.013233] -------------------------------------------------------
[ 990.013233] dbench/1891 is trying to acquire lock:
[ 990.013233] (&REISERFS_SB(s)->lock){+.+.+.}, at: [<ffffffff81159505>] reiserfs_write_lock+0x35/0x50
[ 990.013233]
[ 990.013233] but task is already holding lock:
[ 990.013233] (&REISERFS_I(inode)->i_xattr_sem){+.+.+.}, at: [<ffffffff8115899a>] reiserfs_xattr_set_handle+0x8a/0x470
[ 990.013233]
[ 990.013233] which lock already depends on the new lock.
[ 990.013233]
[ 990.013233]
[ 990.013233] the existing dependency chain (in reverse order) is:
[ 990.013233]
[ 990.013233] -> #1 (&REISERFS_I(inode)->i_xattr_sem){+.+.+.}:
[ 990.013233] [<ffffffff81063afc>] __lock_acquire+0xf9c/0x1560
[ 990.013233] [<ffffffff8106414f>] lock_acquire+0x8f/0xb0
[ 990.013233] [<ffffffff814ac194>] down_write+0x44/0x80
[ 990.013233] [<ffffffff8115899a>] reiserfs_xattr_set_handle+0x8a/0x470
[ 990.013233] [<ffffffff81158e30>] reiserfs_xattr_set+0xb0/0x150
[ 990.013233] [<ffffffff8115a6aa>] user_set+0x8a/0x90
[ 990.013233] [<ffffffff8115901a>] reiserfs_setxattr+0xaa/0xb0
[ 990.013233] [<ffffffff810e2596>] __vfs_setxattr_noperm+0x36/0xa0
[ 990.013233] [<ffffffff810e26bc>] vfs_setxattr+0xbc/0xc0
[ 990.013233] [<ffffffff810e2780>] setxattr+0xc0/0x150
[ 990.013233] [<ffffffff810e289d>] sys_fsetxattr+0x8d/0xa0
[ 990.013233] [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[ 990.013233]
[ 990.013233] -> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
[ 990.013233] [<ffffffff81063e30>] __lock_acquire+0x12d0/0x1560
[ 990.013233] [<ffffffff8106414f>] lock_acquire+0x8f/0xb0
[ 990.013233] [<ffffffff814aba77>] __mutex_lock_common+0x47/0x3b0
[ 990.013233] [<ffffffff814abebe>] mutex_lock_nested+0x3e/0x50
[ 990.013233] [<ffffffff81159505>] reiserfs_write_lock+0x35/0x50
[ 990.013233] [<ffffffff811340e5>] reiserfs_prepare_write+0x45/0x180
[ 990.013233] [<ffffffff81158bb6>] reiserfs_xattr_set_handle+0x2a6/0x470
[ 990.013233] [<ffffffff81158e30>] reiserfs_xattr_set+0xb0/0x150
[ 990.013233] [<ffffffff8115a6aa>] user_set+0x8a/0x90
[ 990.013233] [<ffffffff8115901a>] reiserfs_setxattr+0xaa/0xb0
[ 990.013233] [<ffffffff810e2596>] __vfs_setxattr_noperm+0x36/0xa0
[ 990.013233] [<ffffffff810e26bc>] vfs_setxattr+0xbc/0xc0
[ 990.013233] [<ffffffff810e2780>] setxattr+0xc0/0x150
[ 990.013233] [<ffffffff810e289d>] sys_fsetxattr+0x8d/0xa0
[ 990.013233] [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
[ 990.013233]
[ 990.013233] other info that might help us debug this:
[ 990.013233]
[ 990.013233] 2 locks held by dbench/1891:
[ 990.013233] #0: (&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff810e2678>] vfs_setxattr+0x78/0xc0
[ 990.013233] #1: (&REISERFS_I(inode)->i_xattr_sem){+.+.+.}, at: [<ffffffff8115899a>] reiserfs_xattr_set_handle+0x8a/0x470
[ 990.013233]
[ 990.013233] stack backtrace:
[ 990.013233] Pid: 1891, comm: dbench Not tainted 2.6.33-rc1 #1
[ 990.013233] Call Trace:
[ 990.013233] [<ffffffff81061639>] print_circular_bug+0xe9/0xf0
[ 990.013233] [<ffffffff81063e30>] __lock_acquire+0x12d0/0x1560
[ 990.013233] [<ffffffff8115899a>] ? reiserfs_xattr_set_handle+0x8a/0x470
[ 990.013233] [<ffffffff8106414f>] lock_acquire+0x8f/0xb0
[ 990.013233] [<ffffffff81159505>] ? reiserfs_write_lock+0x35/0x50
[ 990.013233] [<ffffffff8115899a>] ? reiserfs_xattr_set_handle+0x8a/0x470
[ 990.013233] [<ffffffff814aba77>] __mutex_lock_common+0x47/0x3b0
[ 990.013233] [<ffffffff81159505>] ? reiserfs_write_lock+0x35/0x50
[ 990.013233] [<ffffffff81159505>] ? reiserfs_write_lock+0x35/0x50
[ 990.013233] [<ffffffff81062592>] ? mark_held_locks+0x72/0xa0
[ 990.013233] [<ffffffff814ab81d>] ? __mutex_unlock_slowpath+0xbd/0x140
[ 990.013233] [<ffffffff810628ad>] ? trace_hardirqs_on_caller+0x14d/0x1a0
[ 990.013233] [<ffffffff814abebe>] mutex_lock_nested+0x3e/0x50
[ 990.013233] [<ffffffff81159505>] reiserfs_write_lock+0x35/0x50
[ 990.013233] [<ffffffff811340e5>] reiserfs_prepare_write+0x45/0x180
[ 990.013233] [<ffffffff81158bb6>] reiserfs_xattr_set_handle+0x2a6/0x470
[ 990.013233] [<ffffffff81158e30>] reiserfs_xattr_set+0xb0/0x150
[ 990.013233] [<ffffffff814abcb4>] ? __mutex_lock_common+0x284/0x3b0
[ 990.013233] [<ffffffff8115a6aa>] user_set+0x8a/0x90
[ 990.013233] [<ffffffff8115901a>] reiserfs_setxattr+0xaa/0xb0
[ 990.013233] [<ffffffff810e2596>] __vfs_setxattr_noperm+0x36/0xa0
[ 990.013233] [<ffffffff810e26bc>] vfs_setxattr+0xbc/0xc0
[ 990.013233] [<ffffffff810e2780>] setxattr+0xc0/0x150
[ 990.013233] [<ffffffff81056018>] ? sched_clock_cpu+0xb8/0x100
[ 990.013233] [<ffffffff8105eded>] ? trace_hardirqs_off+0xd/0x10
[ 990.013233] [<ffffffff810560a3>] ? cpu_clock+0x43/0x50
[ 990.013233] [<ffffffff810c6820>] ? fget+0xb0/0x110
[ 990.013233] [<ffffffff810c6770>] ? fget+0x0/0x110
[ 990.013233] [<ffffffff81002ddc>] ? sysret_check+0x27/0x62
[ 990.013233] [<ffffffff810e289d>] sys_fsetxattr+0x8d/0xa0
[ 990.013233] [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
Reported-and-tested-by: Christian Kujau <lists@nerdbynature.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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Commit 500f5a0bf5f0624dae34307010e240ec090e4cde
(reiserfs: Fix possible recursive lock) fixed a vmalloc under reiserfs
lock that triggered a lockdep warning because of a
IN-FS-RECLAIM <-> RECLAIM-FS-ON locking dependency inversion.
But this patch has ommitted another vmalloc call in the same path
that allocates the journal. Relax the lock for this one too.
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
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The reiserfs lock -> inode mutex dependency gets inverted when we
relax the lock while walking to the tree.
To fix this, use a specialized version of reiserfs_mutex_lock_safe
that takes care of mutex subclasses. Then we can grab the inode
mutex with I_MUTEX_XATTR subclass without any reiserfs lock
dependency.
This fixes the following report:
[ INFO: possible circular locking dependency detected ]
2.6.32-06793-gf405425-dirty #2
-------------------------------------------------------
mv/18566 is trying to acquire lock:
(&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1110708>] reiserfs_write_lock+0x28=
/0x40
but task is already holding lock:
(&sb->s_type->i_mutex_key#5/3){+.+.+.}, at: [<c111033c>]
reiserfs_for_each_xattr+0x10c/0x380
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#5/3){+.+.+.}:
[<c104f723>] validate_chain+0xa23/0xf70
[<c1050155>] __lock_acquire+0x4e5/0xa70
[<c105075a>] lock_acquire+0x7a/0xa0
[<c134c76f>] mutex_lock_nested+0x5f/0x2b0
[<c11102b4>] reiserfs_for_each_xattr+0x84/0x380
[<c1110615>] reiserfs_delete_xattrs+0x15/0x50
[<c10ef57f>] reiserfs_delete_inode+0x8f/0x140
[<c10a565c>] generic_delete_inode+0x9c/0x150
[<c10a574d>] generic_drop_inode+0x3d/0x60
[<c10a4667>] iput+0x47/0x50
[<c109cc0b>] do_unlinkat+0xdb/0x160
[<c109cca0>] sys_unlink+0x10/0x20
[<c1002c50>] sysenter_do_call+0x12/0x36
-> #0 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c104fc68>] validate_chain+0xf68/0xf70
[<c1050155>] __lock_acquire+0x4e5/0xa70
[<c105075a>] lock_acquire+0x7a/0xa0
[<c134c76f>] mutex_lock_nested+0x5f/0x2b0
[<c1110708>] reiserfs_write_lock+0x28/0x40
[<c1103d6b>] search_by_key+0x1f7b/0x21b0
[<c10e73ef>] search_by_entry_key+0x1f/0x3b0
[<c10e77f7>] reiserfs_find_entry+0x77/0x400
[<c10e81e5>] reiserfs_lookup+0x85/0x130
[<c109a144>] __lookup_hash+0xb4/0x110
[<c109b763>] lookup_one_len+0xb3/0x100
[<c1110350>] reiserfs_for_each_xattr+0x120/0x380
[<c1110615>] reiserfs_delete_xattrs+0x15/0x50
[<c10ef57f>] reiserfs_delete_inode+0x8f/0x140
[<c10a565c>] generic_delete_inode+0x9c/0x150
[<c10a574d>] generic_drop_inode+0x3d/0x60
[<c10a4667>] iput+0x47/0x50
[<c10a1c4f>] dentry_iput+0x6f/0xf0
[<c10a1d74>] d_kill+0x24/0x50
[<c10a396b>] dput+0x5b/0x120
[<c109ca89>] sys_renameat+0x1b9/0x230
[<c109cb28>] sys_rename+0x28/0x30
[<c1002c50>] sysenter_do_call+0x12/0x36
other info that might help us debug this:
2 locks held by mv/18566:
#0: (&sb->s_type->i_mutex_key#5/1){+.+.+.}, at: [<c109b6ac>]
lock_rename+0xcc/0xd0
#1: (&sb->s_type->i_mutex_key#5/3){+.+.+.}, at: [<c111033c>]
reiserfs_for_each_xattr+0x10c/0x380
stack backtrace:
Pid: 18566, comm: mv Tainted: G C 2.6.32-06793-gf405425-dirty #2
Call Trace:
[<c134b252>] ? printk+0x18/0x1e
[<c104e790>] print_circular_bug+0xc0/0xd0
[<c104fc68>] validate_chain+0xf68/0xf70
[<c104c8cb>] ? trace_hardirqs_off+0xb/0x10
[<c1050155>] __lock_acquire+0x4e5/0xa70
[<c105075a>] lock_acquire+0x7a/0xa0
[<c1110708>] ? reiserfs_write_lock+0x28/0x40
[<c134c76f>] mutex_lock_nested+0x5f/0x2b0
[<c1110708>] ? reiserfs_write_lock+0x28/0x40
[<c1110708>] ? reiserfs_write_lock+0x28/0x40
[<c134b60a>] ? schedule+0x27a/0x440
[<c1110708>] reiserfs_write_lock+0x28/0x40
[<c1103d6b>] search_by_key+0x1f7b/0x21b0
[<c1050176>] ? __lock_acquire+0x506/0xa70
[<c1051267>] ? lock_release_non_nested+0x1e7/0x340
[<c1110708>] ? reiserfs_write_lock+0x28/0x40
[<c104e354>] ? trace_hardirqs_on_caller+0x124/0x170
[<c104e3ab>] ? trace_hardirqs_on+0xb/0x10
[<c1042a55>] ? T.316+0x15/0x1a0
[<c1042d2d>] ? sched_clock_cpu+0x9d/0x100
[<c10e73ef>] search_by_entry_key+0x1f/0x3b0
[<c134bf2a>] ? __mutex_unlock_slowpath+0x9a/0x120
[<c104e354>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10e77f7>] reiserfs_find_entry+0x77/0x400
[<c10e81e5>] reiserfs_lookup+0x85/0x130
[<c1042d2d>] ? sched_clock_cpu+0x9d/0x100
[<c109a144>] __lookup_hash+0xb4/0x110
[<c109b763>] lookup_one_len+0xb3/0x100
[<c1110350>] reiserfs_for_each_xattr+0x120/0x380
[<c110ffe0>] ? delete_one_xattr+0x0/0x1c0
[<c1003342>] ? math_error+0x22/0x150
[<c1110708>] ? reiserfs_write_lock+0x28/0x40
[<c1110615>] reiserfs_delete_xattrs+0x15/0x50
[<c1110708>] ? reiserfs_write_lock+0x28/0x40
[<c10ef57f>] reiserfs_delete_inode+0x8f/0x140
[<c10a561f>] ? generic_delete_inode+0x5f/0x150
[<c10ef4f0>] ? reiserfs_delete_inode+0x0/0x140
[<c10a565c>] generic_delete_inode+0x9c/0x150
[<c10a574d>] generic_drop_inode+0x3d/0x60
[<c10a4667>] iput+0x47/0x50
[<c10a1c4f>] dentry_iput+0x6f/0xf0
[<c10a1d74>] d_kill+0x24/0x50
[<c10a396b>] dput+0x5b/0x120
[<c109ca89>] sys_renameat+0x1b9/0x230
[<c1042d2d>] ? sched_clock_cpu+0x9d/0x100
[<c104c8cb>] ? trace_hardirqs_off+0xb/0x10
[<c1042dde>] ? cpu_clock+0x4e/0x60
[<c1350825>] ? do_page_fault+0x155/0x370
[<c1041816>] ? up_read+0x16/0x30
[<c1350825>] ? do_page_fault+0x155/0x370
[<c109cb28>] sys_rename+0x28/0x30
[<c1002c50>] sysenter_do_call+0x12/0x36
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
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When we were using the bkl, we didn't care about dependencies against
other locks, but the mutex conversion created new ones, which is why
we have reiserfs_mutex_lock_safe(), which unlocks the reiserfs lock
before acquiring another mutex.
But this trick actually fails if we have acquired the reiserfs lock
recursively, as we try to unlock it to acquire the new mutex without
inverted dependency, but we eventually only decrease its depth.
This happens in the case of a nested inode creation/deletion.
Say we have no space left on the device, we create an inode
and tak the lock but fail to create its entry, then we release the
inode using iput(), which calls reiserfs_delete_inode() that takes
the reiserfs lock recursively. The path eventually ends up in
journal_begin() where we try to take the journal safely but we
fail because of the reiserfs lock recursion:
[ INFO: possible circular locking dependency detected ]
2.6.32-06486-g053fe57 #2
-------------------------------------------------------
vi/23454 is trying to acquire lock:
(&journal->j_mutex){+.+...}, at: [<c110dac4>] do_journal_begin_r+0x64/0x2f0
but task is already holding lock:
(&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11106a8>] reiserfs_write_lock+0x28/0x40
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c104f8f3>] validate_chain+0xa23/0xf70
[<c1050325>] __lock_acquire+0x4e5/0xa70
[<c105092a>] lock_acquire+0x7a/0xa0
[<c134c78f>] mutex_lock_nested+0x5f/0x2b0
[<c11106a8>] reiserfs_write_lock+0x28/0x40
[<c110dacb>] do_journal_begin_r+0x6b/0x2f0
[<c110ddcf>] journal_begin+0x7f/0x120
[<c10f76c2>] reiserfs_remount+0x212/0x4d0
[<c1093997>] do_remount_sb+0x67/0x140
[<c10a9ca6>] do_mount+0x436/0x6b0
[<c10a9f86>] sys_mount+0x66/0xa0
[<c1002c50>] sysenter_do_call+0x12/0x36
-> #0 (&journal->j_mutex){+.+...}:
[<c104fe38>] validate_chain+0xf68/0xf70
[<c1050325>] __lock_acquire+0x4e5/0xa70
[<c105092a>] lock_acquire+0x7a/0xa0
[<c134c78f>] mutex_lock_nested+0x5f/0x2b0
[<c110dac4>] do_journal_begin_r+0x64/0x2f0
[<c110ddcf>] journal_begin+0x7f/0x120
[<c10ef52f>] reiserfs_delete_inode+0x9f/0x140
[<c10a55fc>] generic_delete_inode+0x9c/0x150
[<c10a56ed>] generic_drop_inode+0x3d/0x60
[<c10a4607>] iput+0x47/0x50
[<c10e915c>] reiserfs_create+0x16c/0x1c0
[<c109a9c1>] vfs_create+0xc1/0x130
[<c109dbec>] do_filp_open+0x81c/0x920
[<c109004f>] do_sys_open+0x4f/0x110
[<c1090179>] sys_open+0x29/0x40
[<c1002c50>] sysenter_do_call+0x12/0x36
other info that might help us debug this:
2 locks held by vi/23454:
#0: (&sb->s_type->i_mutex_key#5){+.+.+.}, at: [<c109d64e>]
do_filp_open+0x27e/0x920
#1: (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c11106a8>]
reiserfs_write_lock+0x28/0x40
stack backtrace:
Pid: 23454, comm: vi Not tainted 2.6.32-06486-g053fe57 #2
Call Trace:
[<c134b202>] ? printk+0x18/0x1e
[<c104e960>] print_circular_bug+0xc0/0xd0
[<c104fe38>] validate_chain+0xf68/0xf70
[<c104ca9b>] ? trace_hardirqs_off+0xb/0x10
[<c1050325>] __lock_acquire+0x4e5/0xa70
[<c105092a>] lock_acquire+0x7a/0xa0
[<c110dac4>] ? do_journal_begin_r+0x64/0x2f0
[<c134c78f>] mutex_lock_nested+0x5f/0x2b0
[<c110dac4>] ? do_journal_begin_r+0x64/0x2f0
[<c110dac4>] ? do_journal_begin_r+0x64/0x2f0
[<c110ff80>] ? delete_one_xattr+0x0/0x1c0
[<c110dac4>] do_journal_begin_r+0x64/0x2f0
[<c110ddcf>] journal_begin+0x7f/0x120
[<c11105b5>] ? reiserfs_delete_xattrs+0x15/0x50
[<c10ef52f>] reiserfs_delete_inode+0x9f/0x140
[<c10a55bf>] ? generic_delete_inode+0x5f/0x150
[<c10ef490>] ? reiserfs_delete_inode+0x0/0x140
[<c10a55fc>] generic_delete_inode+0x9c/0x150
[<c10a56ed>] generic_drop_inode+0x3d/0x60
[<c10a4607>] iput+0x47/0x50
[<c10e915c>] reiserfs_create+0x16c/0x1c0
[<c1099a5d>] ? inode_permission+0x7d/0xa0
[<c109a9c1>] vfs_create+0xc1/0x130
[<c10e8ff0>] ? reiserfs_create+0x0/0x1c0
[<c109dbec>] do_filp_open+0x81c/0x920
[<c104ca9b>] ? trace_hardirqs_off+0xb/0x10
[<c134dc0d>] ? _spin_unlock+0x1d/0x20
[<c10a6eea>] ? alloc_fd+0xba/0xf0
[<c109004f>] do_sys_open+0x4f/0x110
[<c1090179>] sys_open+0x29/0x40
[<c1002c50>] sysenter_do_call+0x12/0x36
To fix this, use reiserfs_lock_once() from reiserfs_delete_inode()
which prevents from adding reiserfs lock recursion.
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
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While allocating the bitmap using vmalloc, we hold the reiserfs lock,
which makes lockdep later reporting a possible deadlock as we may
swap out pages to allocate memory and then take the reiserfs lock
recursively:
inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
kswapd0/312 [HC0[0]:SC0[0]:HE1:SE1] takes:
(&REISERFS_SB(s)->lock){+.+.?.}, at: [<c11108a8>] reiserfs_write_lock+0x28/0x40
{RECLAIM_FS-ON-W} state was registered at:
[<c104e1c2>] mark_held_locks+0x62/0x90
[<c104e28a>] lockdep_trace_alloc+0x9a/0xc0
[<c108e396>] kmem_cache_alloc+0x26/0xf0
[<c10850ec>] __get_vm_area_node+0x6c/0xf0
[<c10857de>] __vmalloc_node+0x7e/0xa0
[<c108597b>] vmalloc+0x2b/0x30
[<c10e00b9>] reiserfs_init_bitmap_cache+0x39/0x70
[<c10f8178>] reiserfs_fill_super+0x2e8/0xb90
[<c1094345>] get_sb_bdev+0x145/0x180
[<c10f5a11>] get_super_block+0x21/0x30
[<c10931f0>] vfs_kern_mount+0x40/0xd0
[<c10932d9>] do_kern_mount+0x39/0xd0
[<c10a9857>] do_mount+0x2c7/0x6b0
[<c10a9ca6>] sys_mount+0x66/0xa0
[<c161589b>] mount_block_root+0xc4/0x245
[<c1615a75>] mount_root+0x59/0x5f
[<c1615b8c>] prepare_namespace+0x111/0x14b
[<c1615269>] kernel_init+0xcf/0xdb
[<c10031fb>] kernel_thread_helper+0x7/0x1c
This is actually fine for two reasons: we call vmalloc at mount time
then it's not in the swapping out path. Also the reiserfs lock can be
acquired recursively, but since its implementation depends on a mutex,
it's hard and not necessary worth it to teach that to lockdep.
The lock is useless at mount time anyway, at least until we replay the
journal. But let's remove it from this path later as this needs
more thinking and is a sensible change.
For now we can just relax the lock around vmalloc,
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
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