Merge branch 'linus' into x86/xen

ext4: Fix whitespace checkpatch warnings/errors

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

Merge branch 'x86/oprofile' into oprofile

Merge branch 'linus' into x86/gart

Merge branch 'linus' into x86/tracehook

Conflicts:
arch/x86/Kconfig

Signed-off-by: Ingo Molnar <mingo@elte.hu>

Merge branch 'linus' into x86/cpu

Merge branch 'x86/core' into x86/apic

Merge branch 'linus' into x86/core

Conflicts:
arch/x86/kernel/genapic_64.c
include/asm-x86/kvm_host.h

Signed-off-by: Ingo Molnar <mingo@elte.hu>

Merge commit 'v2.6.27-rc3' into x86/prototypes

Conflicts:

include/asm-x86/dma-mapping.h

Signed-off-by: Ingo Molnar <mingo@elte.hu>

Merge commit 'v2.6.27-rc3' into x86/xsave

Conflicts:

arch/x86/kernel/genapic_64.c
include/asm-x86/kvm_host.h

Signed-off-by: Ingo Molnar <mingo@elte.hu>

Merge commit 'v2.6.27-rc3' into x86/urgent

Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

Conflicts:

include/asm-arm/arch-omap/onenand.h

Merge branch 'linus' into sched/urgent

Merge branch 'linus' into core/rcu

Merge branch 'linus' into x86/cleanups

Merge branch 'linus' into x86/x2apic

Conflicts:

arch/x86/kernel/genapic_64.c

Manual merge:

arch/x86/kernel/genx2apic_uv_x.c

Signed-off-by: Ingo Molnar <mingo@elte.hu>

Merge branch 'linus' into sched/clock

Merge http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm into for-rmk

Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
ext4: remove write-only variables fr

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
ext4: remove write-only variables from ext4_ordered_write_end
ext4: unexport jbd2_journal_update_superblock
ext4: Cleanup whitespace and other miscellaneous style issues
ext4: improve ext4_fill_flex_info() a bit
ext4: Cleanup the block reservation code path
ext4: don't assume extents can't cross block groups when truncating
ext4: Fix lack of credits BUG() when deleting a badly fragmented inode
ext4: Fix ext4_ext_journal_restart()
ext4: fix ext4_da_write_begin error path
jbd2: don't abort if flushing file data failed
ext4: don't read inode block if the buffer has a write error
ext4: Don't allow lg prealloc list to be grow large.
ext4: Convert the usage of NR_CPUS to nr_cpu_ids.
ext4: Improve error handling in mballoc
ext4: lock block groups when initializing
ext4: sync up block and inode bitmap reading functions
ext4: Allow read/only mounts with corrupted block group checksums
ext4: Fix data corruption when writing to prealloc area

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Merge branch 'linus' into timers/hpet

Merge branch 'x86/core' into x86/xsave

Merge branch 'master' of /home/cbou/linux-2.6

Conflicts:

drivers/power/Kconfig
drivers/power/Makefile

ext4: journal credits reservation fixes for DIO, fallocate

DIO and fallocate credit calculation is different than writepage, as
they do start a new journal right for each call to ext4_get_blocks_wra

ext4: journal credits reservation fixes for DIO, fallocate

DIO and fallocate credit calculation is different than writepage, as
they do start a new journal right for each call to ext4_get_blocks_wrap().
This patch uses the helper function in DIO and fallocate case, passing
a flag indicating that the modified data are contigous thus could account
less indirect/index blocks.

This patch also fixed the journal credit reservation for direct I/O
(DIO). Previously the estimated credits for DIO only was calculated for
non-extent files, which was not enough if the file is extent-based.

Also fixed was fallocate double-counting credits for modifying the the
superblock.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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ext4: journal credits calulation cleanup and fix for non-extent writepage

When considering how many journal credits are needed for modifying a
chunk of data, we need to account for the super block,

ext4: journal credits calulation cleanup and fix for non-extent writepage

When considering how many journal credits are needed for modifying a
chunk of data, we need to account for the super block, inode block,
quota blocks and xattr block, indirect/index blocks, also, group bitmap
and group descriptor blocks for new allocation (including data and
indirect/index blocks). There are many places in ext4 do the calculation
on their own and often missed one or two meta blocks, and often they
assume single block allocation, and did not considering the multile
chunk of allocation case.

This patch is trying to cleanup current journal credit code, provides
some common helper funtion to calculate the journal credits, to be used
for writepage, writepages, DIO, fallocate, migration, defrag, and for
both nonextent and extent files.

This patch modified the writepage/write_begin credit caculation for
nonextent files, to use the new helper function. It also fixed the
problem that writepage on nonextent files did not consider the case
blocksize <pagesize, thus could possibelly need multiple block
allocation in a single transaction.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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