2005-04-16 15:20:36 -07:00
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2006-01-11 12:17:46 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 02:19:27 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] spinlock consolidation
This patch (written by me and also containing many suggestions of Arjan van
de Ven) does a major cleanup of the spinlock code. It does the following
things:
- consolidates and enhances the spinlock/rwlock debugging code
- simplifies the asm/spinlock.h files
- encapsulates the raw spinlock type and moves generic spinlock
features (such as ->break_lock) into the generic code.
- cleans up the spinlock code hierarchy to get rid of the spaghetti.
Most notably there's now only a single variant of the debugging code,
located in lib/spinlock_debug.c. (previously we had one SMP debugging
variant per architecture, plus a separate generic one for UP builds)
Also, i've enhanced the rwlock debugging facility, it will now track
write-owners. There is new spinlock-owner/CPU-tracking on SMP builds too.
All locks have lockup detection now, which will work for both soft and hard
spin/rwlock lockups.
The arch-level include files now only contain the minimally necessary
subset of the spinlock code - all the rest that can be generalized now
lives in the generic headers:
include/asm-i386/spinlock_types.h | 16
include/asm-x86_64/spinlock_types.h | 16
I have also split up the various spinlock variants into separate files,
making it easier to see which does what. The new layout is:
SMP | UP
----------------------------|-----------------------------------
asm/spinlock_types_smp.h | linux/spinlock_types_up.h
linux/spinlock_types.h | linux/spinlock_types.h
asm/spinlock_smp.h | linux/spinlock_up.h
linux/spinlock_api_smp.h | linux/spinlock_api_up.h
linux/spinlock.h | linux/spinlock.h
/*
* here's the role of the various spinlock/rwlock related include files:
*
* on SMP builds:
*
* asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
* initializers
*
* linux/spinlock_types.h:
* defines the generic type and initializers
*
* asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel
* implementations, mostly inline assembly code
*
* (also included on UP-debug builds:)
*
* linux/spinlock_api_smp.h:
* contains the prototypes for the _spin_*() APIs.
*
* linux/spinlock.h: builds the final spin_*() APIs.
*
* on UP builds:
*
* linux/spinlock_type_up.h:
* contains the generic, simplified UP spinlock type.
* (which is an empty structure on non-debug builds)
*
* linux/spinlock_types.h:
* defines the generic type and initializers
*
* linux/spinlock_up.h:
* contains the __raw_spin_*()/etc. version of UP
* builds. (which are NOPs on non-debug, non-preempt
* builds)
*
* (included on UP-non-debug builds:)
*
* linux/spinlock_api_up.h:
* builds the _spin_*() APIs.
*
* linux/spinlock.h: builds the final spin_*() APIs.
*/
All SMP and UP architectures are converted by this patch.
arm, i386, ia64, ppc, ppc64, s390/s390x, x64 was build-tested via
crosscompilers. m32r, mips, sh, sparc, have not been tested yet, but should
be mostly fine.
From: Grant Grundler <grundler@parisc-linux.org>
Booted and lightly tested on a500-44 (64-bit, SMP kernel, dual CPU).
Builds 32-bit SMP kernel (not booted or tested). I did not try to build
non-SMP kernels. That should be trivial to fix up later if necessary.
I converted bit ops atomic_hash lock to raw_spinlock_t. Doing so avoids
some ugly nesting of linux/*.h and asm/*.h files. Those particular locks
are well tested and contained entirely inside arch specific code. I do NOT
expect any new issues to arise with them.
If someone does ever need to use debug/metrics with them, then they will
need to unravel this hairball between spinlocks, atomic ops, and bit ops
that exist only because parisc has exactly one atomic instruction: LDCW
(load and clear word).
From: "Luck, Tony" <tony.luck@intel.com>
ia64 fix
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjanv@infradead.org>
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Cc: Matthew Wilcox <willy@debian.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Mikael Pettersson <mikpe@csd.uu.se>
Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 00:25:56 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:19:52 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:19:52 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] buffer: memorder fix
unlock_buffer(), like unlock_page(), must not clear the lock without
ensuring that the critical section is closed.
Mingming later sent the same patch, saying:
We are running SDET benchmark and saw double free issue for ext3 extended
attributes block, which complains the same xattr block already being freed (in
ext3_xattr_release_block()). The problem could also been triggered by
multiple threads loop untar/rm a kernel tree.
The race is caused by missing a memory barrier at unlock_buffer() before the
lock bit being cleared, resulting in possible concurrent h_refcounter update.
That causes a reference counter leak, then later leads to the double free that
we have seen.
Inside unlock_buffer(), there is a memory barrier is placed *after* the lock
bit is being cleared, however, there is no memory barrier *before* the bit is
cleared. On some arch the h_refcount update instruction and the clear bit
instruction could be reordered, thus leave the critical section re-entered.
The race is like this: For example, if the h_refcount is initialized as 1,
cpu 0: cpu1
-------------------------------------- -----------------------------------
lock_buffer() /* test_and_set_bit */
clear_buffer_locked(bh);
lock_buffer() /* test_and_set_bit */
h_refcount = h_refcount+1; /* = 2*/ h_refcount = h_refcount + 1; /*= 2 */
clear_buffer_locked(bh);
.... ......
We lost a h_refcount here. We need a memory barrier before the buffer head lock
bit being cleared to force the order of the two writes. Please apply.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-10 01:46:22 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] mm: split page table lock
Christoph Lameter demonstrated very poor scalability on the SGI 512-way, with
a many-threaded application which concurrently initializes different parts of
a large anonymous area.
This patch corrects that, by using a separate spinlock per page table page, to
guard the page table entries in that page, instead of using the mm's single
page_table_lock. (But even then, page_table_lock is still used to guard page
table allocation, and anon_vma allocation.)
In this implementation, the spinlock is tucked inside the struct page of the
page table page: with a BUILD_BUG_ON in case it overflows - which it would in
the case of 32-bit PA-RISC with spinlock debugging enabled.
Splitting the lock is not quite for free: another cacheline access. Ideally,
I suppose we would use split ptlock only for multi-threaded processes on
multi-cpu machines; but deciding that dynamically would have its own costs.
So for now enable it by config, at some number of cpus - since the Kconfig
language doesn't support inequalities, let preprocessor compare that with
NR_CPUS. But I don't think it's worth being user-configurable: for good
testing of both split and unsplit configs, split now at 4 cpus, and perhaps
change that to 8 later.
There is a benefit even for singly threaded processes: kswapd can be attacking
one part of the mm while another part is busy faulting.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 18:16:40 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:24:47 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:24:47 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:24:47 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] Fix and add EXPORT_SYMBOL(filemap_write_and_wait)
This patch add EXPORT_SYMBOL(filemap_write_and_wait) and use it.
See mm/filemap.c:
And changes the filemap_write_and_wait() and filemap_write_and_wait_range().
Current filemap_write_and_wait() doesn't wait if filemap_fdatawrite()
returns error. However, even if filemap_fdatawrite() returned an
error, it may have submitted the partially data pages to the device.
(e.g. in the case of -ENOSPC)
<quotation>
Andrew Morton writes,
If filemap_fdatawrite() returns an error, this might be due to some
I/O problem: dead disk, unplugged cable, etc. Given the generally
crappy quality of the kernel's handling of such exceptions, there's a
good chance that the filemap_fdatawait() will get stuck in D state
forever.
</quotation>
So, this patch doesn't wait if filemap_fdatawrite() returns the -EIO.
Trond, could you please review the nfs part? Especially I'm not sure,
nfs must use the "filemap_fdatawrite(inode->i_mapping) == 0", or not.
Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-08 01:02:14 -08:00
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2005-04-16 15:20:36 -07:00
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2007-01-10 23:15:41 -08:00
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2005-04-16 15:20:36 -07:00
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2007-01-10 23:15:41 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:58:47 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-25 03:07:44 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:58:47 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:58:47 -07:00
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2005-04-16 15:20:36 -07:00
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2007-01-10 23:15:41 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 00:59:39 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2007-05-06 14:49:54 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-30 03:03:28 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-10 01:45:39 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-28 20:44:55 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:15:59 -08:00
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2005-10-21 02:55:38 -04:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:03:16 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-27 02:53:54 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-17 00:10:19 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:56:56 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-17 00:10:19 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:59:26 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:59:26 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 18:24:46 +02:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:59 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-17 00:10:19 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:03:34 -07:00
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2007-10-16 23:25:47 -07:00
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2007-07-17 04:03:34 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:03:34 -07:00
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2006-10-10 04:36:54 +02:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:03:34 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:59 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:59 -08:00
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2006-10-17 00:10:19 -07:00
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2008-02-08 04:21:59 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:59 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:19:10 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:59 -08:00
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2005-04-16 15:20:36 -07:00
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2006-02-01 03:06:48 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-17 09:02:07 +11:00
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2005-04-16 15:20:36 -07:00
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2007-05-16 22:11:21 -07:00
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2007-07-17 04:03:05 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 18:24:46 +02:00
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2005-04-16 15:20:36 -07:00
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2006-01-14 13:20:43 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-11 01:21:46 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:16:09 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-11 01:21:46 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-11 01:21:46 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:59:26 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:19:52 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:03:34 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:03:34 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:59 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-17 00:10:19 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-14 13:20:43 -08:00
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2007-02-12 00:52:14 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:52:14 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:52:14 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 00:59:39 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:52:14 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:52:14 -08:00
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2005-04-16 15:20:36 -07:00
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2005-10-30 15:03:15 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:59:26 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:52:14 -08:00
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2005-04-16 15:20:36 -07:00
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2005-10-30 15:03:15 -08:00
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2005-04-16 15:20:36 -07:00
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2007-05-06 14:49:55 -07:00
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2005-04-16 15:20:36 -07:00
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|
rewrite rd
This is a rewrite of the ramdisk block device driver.
The old one is really difficult because it effectively implements a block
device which serves data out of its own buffer cache. It relies on the dirty
bit being set, to pin its backing store in cache, however there are non
trivial paths which can clear the dirty bit (eg. try_to_free_buffers()),
which had recently lead to data corruption. And in general it is completely
wrong for a block device driver to do this.
The new one is more like a regular block device driver. It has no idea about
vm/vfs stuff. It's backing store is similar to the buffer cache (a simple
radix-tree of pages), but it doesn't know anything about page cache (the pages
in the radix tree are not pagecache pages).
There is one slight downside -- direct block device access and filesystem
metadata access goes through an extra copy and gets stored in RAM twice.
However, this downside is only slight, because the real buffercache of the
device is now reclaimable (because we're not playing crazy games with it), so
under memory intensive situations, footprint should effectively be the same --
maybe even a slight advantage to the new driver because it can also reclaim
buffer heads.
The fact that it now goes through all the regular vm/fs paths makes it
much more useful for testing, too.
text data bss dec hex filename
2837 849 384 4070 fe6 drivers/block/rd.o
3528 371 12 3911 f47 drivers/block/brd.o
Text is larger, but data and bss are smaller, making total size smaller.
A few other nice things about it:
- Similar structure and layout to the new loop device handlinag.
- Dynamic ramdisk creation.
- Runtime flexible buffer head size (because it is no longer part of the
ramdisk code).
- Boot / load time flexible ramdisk size, which could easily be extended
to a per-ramdisk runtime changeable size (eg. with an ioctl).
- Can use highmem for the backing store.
[akpm@linux-foundation.org: fix build]
[byron.bbradley@gmail.com: make rd_size non-static]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Byron Bradley <byron.bbradley@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-08 04:19:49 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 18:24:46 +02:00
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2005-04-16 15:20:36 -07:00
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2006-01-14 13:20:43 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:51:41 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:37:18 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:37:18 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:37:18 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 00:59:39 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:15:48 -07:00
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2006-03-26 01:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-08 01:03:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:15:47 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-06 14:49:05 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-08 00:23:27 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-20 13:57:54 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:01 -07:00
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2008-02-04 22:28:29 -08:00
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2007-10-16 01:25:01 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:15:45 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:00 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:00 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:51:41 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:15:45 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:01 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:01 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:01 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:59:01 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-16 21:53:49 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:38:00 -08:00
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2005-05-16 21:53:49 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:29 -08:00
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2005-05-16 21:53:49 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2006-01-08 01:02:13 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2006-01-08 01:02:13 -08:00
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2007-10-16 01:25:07 -07:00
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2006-01-08 01:02:13 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2008-02-04 22:28:29 -08:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2008-02-04 22:28:29 -08:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-09 15:59:24 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-19 17:39:55 +10:00
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2007-07-20 00:31:45 -07:00
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2007-07-19 17:39:55 +10:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:24:47 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
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2007-10-16 01:25:25 -07:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
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|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
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2008-02-04 22:28:29 -08:00
|
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|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
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|
2005-04-16 15:20:36 -07:00
|
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|
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|
|
|
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
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|
2007-10-16 01:25:25 -07:00
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
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|
|
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|
|
|
2007-10-16 01:25:25 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
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|
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|
2005-04-16 15:20:36 -07:00
|
|
|
|
2007-10-16 01:25:25 -07:00
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2007-10-16 01:25:25 -07:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2007-10-16 01:25:25 -07:00
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
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|
|
|
|
|
|
|
2007-10-16 01:25:25 -07:00
|
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|
2005-04-16 15:20:36 -07:00
|
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2007-10-16 01:25:25 -07:00
|
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2005-04-16 15:20:36 -07:00
|
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|
2007-10-21 06:57:41 +02:00
|
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|
2007-10-16 01:25:25 -07:00
|
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2005-04-16 15:20:36 -07:00
|
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2007-10-16 01:25:25 -07:00
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|
|
|
|
|
|
|
|
|
|
|
|
fs: fix nobh error handling
nobh mode error handling is not just pretty slack, it's wrong.
One cannot zero out the whole page to ensure new blocks are zeroed, because
it just brings the whole page "uptodate" with zeroes even if that may not
be the correct uptodate data. Also, other parts of the page may already
contain dirty data which would get lost by zeroing it out. Thirdly, the
writeback of zeroes to the new blocks will also erase existing blocks. All
these conditions are pagecache and/or filesystem corruption.
The problem comes about because we didn't keep track of which buffers
actually are new or old. However it is not enough just to keep only this
state, because at the point we start dirtying parts of the page (new
blocks, with zeroes), the handling of IO errors becomes impossible without
buffers because the page may only be partially uptodate, in which case the
page flags allone cannot capture the state of the parts of the page.
So allocate all buffers for the page upfront, but leave them unattached so
that they don't pick up any other references and can be freed when we're
done. If the error path is hit, then zero the new buffers as the regular
buffer path does, then attach the buffers to the page so that it can
actually be written out correctly and be subject to the normal IO error
handling paths.
As an upshot, we save 1K of kernel stack on ia64 or powerpc 64K page
systems.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 01:24:48 -07:00
|
|
|
|
2007-02-20 13:58:09 -08:00
|
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|
2005-04-16 15:20:36 -07:00
|
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:29 -08:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:25 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-08 01:03:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-08 01:03:05 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:51:41 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:29 -08:00
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2005-04-16 15:20:36 -07:00
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2005-10-30 15:00:16 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:29 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2007-09-27 12:47:43 +02:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:19:10 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:19:10 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:19:10 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:19:10 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:19:10 -07:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:24:07 -07:00
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2006-02-03 03:04:43 -08:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:24:07 -07:00
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2006-02-03 03:04:43 -08:00
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2005-04-16 15:20:36 -07:00
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2005-05-01 08:58:39 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:59 -08:00
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2005-04-16 15:20:36 -07:00
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|
Resurrect 'try_to_free_buffers()' VM hackery
It's not pretty, but it appears that ext3 with data=journal will clean
pages without ever actually telling the VM that they are clean. This,
in turn, will result in the VM (and balance_dirty_pages() in particular)
to never realize that the pages got cleaned, and wait forever for an
event that already happened.
Technically, this seems to be a problem with ext3 itself, but it used to
be hidden by 'try_to_free_buffers()' noticing this situation on its own,
and just working around the filesystem problem.
This commit re-instates that hack, in order to avoid a regression for
the 2.6.20 release. This fixes bugzilla 7844:
http://bugzilla.kernel.org/show_bug.cgi?id=7844
Peter Zijlstra points out that we should probably retain the debugging
code that this removes from cancel_dirty_page(), and I agree, but for
the imminent release we might as well just silence the warning too
(since it's not a new bug: anything that triggers that warning has been
around forever).
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-01-26 12:47:06 -08:00
|
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|
2005-04-16 15:20:36 -07:00
|
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|
|
|
|
|
|
|
Resurrect 'try_to_free_buffers()' VM hackery
It's not pretty, but it appears that ext3 with data=journal will clean
pages without ever actually telling the VM that they are clean. This,
in turn, will result in the VM (and balance_dirty_pages() in particular)
to never realize that the pages got cleaned, and wait forever for an
event that already happened.
Technically, this seems to be a problem with ext3 itself, but it used to
be hidden by 'try_to_free_buffers()' noticing this situation on its own,
and just working around the filesystem problem.
This commit re-instates that hack, in order to avoid a regression for
the 2.6.20 release. This fixes bugzilla 7844:
http://bugzilla.kernel.org/show_bug.cgi?id=7844
Peter Zijlstra points out that we should probably retain the debugging
code that this removes from cancel_dirty_page(), and I agree, but for
the imminent release we might as well just silence the warning too
(since it's not a new bug: anything that triggers that warning has been
around forever).
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-01-26 12:47:06 -08:00
|
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|
2007-01-30 14:36:27 +11:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Resurrect 'try_to_free_buffers()' VM hackery
It's not pretty, but it appears that ext3 with data=journal will clean
pages without ever actually telling the VM that they are clean. This,
in turn, will result in the VM (and balance_dirty_pages() in particular)
to never realize that the pages got cleaned, and wait forever for an
event that already happened.
Technically, this seems to be a problem with ext3 itself, but it used to
be hidden by 'try_to_free_buffers()' noticing this situation on its own,
and just working around the filesystem problem.
This commit re-instates that hack, in order to avoid a regression for
the 2.6.20 release. This fixes bugzilla 7844:
http://bugzilla.kernel.org/show_bug.cgi?id=7844
Peter Zijlstra points out that we should probably retain the debugging
code that this removes from cancel_dirty_page(), and I agree, but for
the imminent release we might as well just silence the warning too
(since it's not a new bug: anything that triggers that warning has been
around forever).
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-01-26 12:47:06 -08:00
|
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2007-01-30 14:36:27 +11:00
|
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|
2005-04-16 15:20:36 -07:00
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2006-03-26 01:37:17 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-06 20:33:20 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-24 03:18:10 -08:00
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2005-04-16 15:20:36 -07:00
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2005-10-07 07:46:04 +01:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:36 -08:00
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2007-10-16 01:25:52 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-16 22:10:57 -07:00
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2005-09-06 15:18:17 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:18:17 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:18:17 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-06 15:18:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-24 03:18:10 -08:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:10 -07:00
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2005-04-16 15:20:36 -07:00
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2008-01-28 23:58:26 -05:00
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2008-02-04 22:28:36 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-04 22:28:36 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-19 17:39:55 +10:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:07 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-08 01:02:13 -08:00
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2005-04-16 15:20:36 -07:00
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