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We used to protect against overflow, but rather than return an error, do
what read/write does, namely to limit the total size to MAX_RW_COUNT.
This is not only more consistent, but it also means that any broken
low-level read/write routine that still keeps counts in 'int' can't
break.
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] fix kprobes single stepping
[S390] tape: fix dbf usage
[S390] dasd: provide a Sense Path Group ID ioctl
[S390] ftrace: select HAVE_C_RECORDMCOUNT
[S390] vdso: get rid of redefinition warnings
[S390] facility detection: remove unused variable
[S390] hypfs: Fix error handling in hypfs_diag initialization
[S390] topology: fix cpu masks for topology=off case
[S390] topology: add SCHED_MC config option
[S390] Kconfig: add machine type number to code generation options
[S390] Add z196 machine type to setup_hwcaps
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Fix kprobes after git commit 1e54622e0403891b10f2105663e0f9dd595a1f17
broke it. The kprobe_handler is now called with interrupts in the state
at the time of the breakpoint. The single step of the replaced instruction
is done with interrupts off which makes it necessary to enable and disable
the interupts in the kprobes code.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Get rid of the format string "%s" usage with volatile strings
to prevent use after free errors in the s390dbf.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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The BIODASDSNID ioctl executes a 'Sense Path Group ID'
command on a DASD ECKD device. The returned path group data
allows user space programs to determine path state and
path group ID of the channel paths to the device.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Select HAVE_C_RECORDMCOUNT for the fast C version of recordmcount.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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The CLOCK_* defines in asm-offsets.c are only used for the vdso code
however in the meantime they cause other trouble.
Just rename them to get permanently rid of this:
In file included from /home2/heicarst/linux-2.6/arch/s390/include/asm/asm-offsets.h:1:0,
from arch/s390/mm/fault.c:33:
include/generated/asm-offsets.h:53:0: warning: "CLOCK_REALTIME" redefined
include/linux/time.h:286:0: note: this is the location of the previous definition
include/generated/asm-offsets.h:54:0: warning: "CLOCK_MONOTONIC" redefined
include/linux/time.h:287:0: note: this is the location of the previous definition
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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arch/s390/kernel/early.c: In function 'setup_hpage':
arch/s390/kernel/early.c:285:15: warning: unused variable 'facilities'
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix the following two error handling bugs in hypfs_diag_init():
* No need for calling diag204_free_buffer()
* Initialize name table only in case of LPAR and prevent error message
on non-LPAR systems.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix cpu masks for 'topology=off' case. Folding of the scheduling domains
happen in such a way that everything belongs to the MC domain instead
of the CPU doimain.
This should fix a performance regression introduced with
eafd2b6d "[S390] topology: use default MC domain initializer" and also
makes sure we have the same behavious as if CONFIG_SCHED_MC was not
selected at all.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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This allows us to easily check for performance differences seen with
!CONFIG_SCHED_MC and topology=off.
Actually there shouldn't be any (besides a small overhead because of
additional code).
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add machine type number to code generation options. Also clean up and
shorten quite a lot of help texts with respect to machine type and
architecture terminology.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add machine type for zEnterprise 196 to elf platform detection.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus:
Squashfs: fix function prototype
Squashfs: fix use of __le64 annotated variable
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The fourth argument should be unsigned. Also add missing include
so that the function prototype is defined in xattr_id.c
This fixes a couple of sparse warnings.
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
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This fixes a sparse with endian checking warning.
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
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* 'for-linus' of git://neil.brown.name/md:
md: tidy up device searches in read_balance.
md/raid1: fix some typos in comments.
md/raid1: discard unused variable.
md: unplug writes to external bitmaps.
md: use separate bio pool for each md device.
md: change type of first arg to sync_page_io.
md/raid1: perform mem allocation before disabling writes during resync.
md: use bio_kmalloc rather than bio_alloc when failure is acceptable.
md: Fix possible deadlock with multiple mempool allocations.
md: fix and update workqueue usage
md: use sector_t in bitmap_get_counter
md: remove md_mutex locking.
md: Fix regression with raid1 arrays without persistent metadata.
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The code for searching through the device list to read-balance in
raid1 is rather clumsy and hard to follow. Try to simplify it a bit.
No important functionality change here.
Signed-off-by: NeilBrown <neilb@suse.de>
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Signed-off-by: NeilBrown <neilb@suse.de>
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This structure field (flushing_bio_list) is never used, so remove it.
Signed-off-by: NeilBrown <neilb@suse.de>
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When writing to an 'external' bitmap we don't currently unplug the
device before waiting, so we can get a 3msec delay each time;
So use REQ_UNPLUG to force and unplug.
Signed-off-by: NeilBrown <neilb@suse.de>
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bio_clone and bio_alloc allocate from a common bio pool.
If an md device is stacked with other devices that use this pool, or under
something like swap which uses the pool, then the multiple calls on
the pool can cause deadlocks.
So allocate a local bio pool for each md array and use that rather
than the common pool.
This pool is used both for regular IO and metadata updates.
Signed-off-by: NeilBrown <neilb@suse.de>
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Currently sync_page_io takes a 'bdev'.
Every caller passes 'rdev->bdev'.
We will soon want another field out of the rdev in sync_page_io,
So just pass the rdev instead of the bdev out of it.
Signed-off-by: NeilBrown <neilb@suse.de>
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Though this mem alloc is GFP_NOIO an so will not deadlock, it seems
better to do the allocation before 'raise_barrier' which stops any IO
requests while the resync proceeds.
raid10 always uses this order, so it is at least consistent to do the
same in raid1.
Signed-off-by: NeilBrown <neilb@suse.de>
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bio_alloc can never fail (as it uses a mempool) but an block
indefinitely, especially if the caller is holding a reference to a
previously allocated bio.
So these to places which both handle failure and hold multiple bios
should not use bio_alloc, they should use bio_kmalloc.
Signed-off-by: NeilBrown <neilb@suse.de>
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It is not safe to allocate from a mempool while holding an item
previously allocated from that mempool as that can deadlock when the
mempool is close to exhaustion.
So don't use a bio list to collect the bios to write to multiple
devices in raid1 and raid10.
Instead queue each bio as it becomes available so an unplug will
activate all previously allocated bios and so a new bio has a chance
of being allocated.
This means we must set the 'remaining' count to '1' before submitting
any requests, then when all are submitted, decrement 'remaining' and
possible handle the write completion at that point.
Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com>
Tested-by: Torsten Kaiser <just.for.lkml@googlemail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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Workqueue usage in md has two problems.
* Flush can be used during or depended upon by memory reclaim, but md
uses the system workqueue for flush_work which may lead to deadlock.
* md depends on flush_scheduled_work() to achieve exclusion against
completion of removal of previous instances. flush_scheduled_work()
may incur unexpected amount of delay and is scheduled to be removed.
This patch adds two workqueues to md - md_wq and md_misc_wq. The
former is guaranteed to make forward progress under memory pressure
and serves flush_work. The latter serves as the flush domain for
other works.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
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bitmap_get_counter returns the number of sectors covered
by the counter in a pass-by-reference variable.
In some cases this can be very large, so make it a sector_t
for safety.
Signed-off-by: NeilBrown <neilb@suse.de>
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lock_kernel calls were recently pushed down into open/release
functions.
md doesn't need that protection.
Then the BKL calls were change to md_mutex. We don't need those
either.
So remove it all.
Signed-off-by: NeilBrown <neilb@suse.de>
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A RAID1 which has no persistent metadata, whether internal or
external, will hang on the first write.
This is caused by commit 070dc6dd7103b6b3f7e4d46e754354a5c15f366e
In that case, MD_CHANGE_PENDING never gets cleared.
So during md_update_sb, is neither persistent or external,
clear MD_CHANGE_PENDING.
This is suitable for 2.6.36-stable.
Signed-off-by: NeilBrown <neilb@suse.de>
Cc: stable@kernel.org
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (29 commits)
braino in internal.h
convert simple cases of nfs-related ->get_sb() to ->mount()
convert btrfs
convert ceph
convert gfs2
convert afs
convert ecryptfs
convert sysfs
convert cgroup and cpuset
switch get_sb_ns() users
switch procfs to ->mount()
setting ->proc_mnt doesn't belong in proc_get_sb()
convert cifs
convert nilfs
switch logfs to ->mount()
logfs: fix a leak in get_sb
logfs get_sb, part 3
logfs get_sb, part 2
logfs get_sb massage, part 1
convert v9fs
...
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wrong return type...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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take that to kern_mount_data()-using callers
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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a) switch ->put_device() to logfs_super *
b) actually call it on early failures in logfs_get_sb_device()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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take logfs_get_sb_device() calls to logfs_get_sb() itself
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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take setting s_bdev/s_mtd/s_devops to callers of logfs_get_sb_device(),
don't bother passing them separately
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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move allocation of logfs_super to logfs_get_sb, pass it to
logfs_get_sb_...().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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