When writing to a mirror, the log must be updated first.  Failure
to update the log could result in the log not properly reflecting
the state of the mirror if the machine should crash.

We change the return type of the rh_flush function to give us
the ability to check if a log write was successful.  If the
log write was unsuccessful, we fail the writes to avoid the
case where the log does not properly reflect the state of the
mirror.

A follow-up patch - which is dependent on the ability to
requeue I/O's to core device-mapper - will requeue the I/O's
for retry (allowing the mirror to be reconfigured.)
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Device-mapper mirroring currently takes a best effort approach to
recovery - failures during mirror synchronization are completely ignored.
This means that regions are marked 'in-sync' and 'clean' and removed
from the hash list.  Future reads and writes that query the region
will incorrectly interpret the region as in-sync.

This patch handles failures during the recovery process.  If a failure
occurs, the region is marked as 'not-in-sync' (aka RH_NOSYNC) and added
to a new list 'failed_recovered_regions'.

Regions on the 'failed_recovered_regions' list are not marked as 'clean'
upon removal from the list.  Furthermore, if the DM_RAID1_HANDLE_ERRORS
flag is set, the region is marked as 'not-in-sync'.  This action prevents
any future read-balancing from choosing an invalid device because of the
'not-in-sync' status.

If "handle_errors" is not specified when creating a mirror (leaving the
DM_RAID1_HANDLE_ERRORS flag unset), failures will be ignored exactly as they
would be without this patch.  This is to preserve backwards compatibility with
user-space tools, such as 'pvmove'.  However, since future read-balancing
policies will rely on the correct sync status of a region, a user must choose
"handle_errors" when using read-balancing.
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Add ratelimit extension to dm logging macros.
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This patch causes device-mapper to reject any barrier requests.  This is done
since most of the targets won't handle this correctly anyway.  So until the
situation improves it is better to reject these requests at the first place.
Since barrier requests won't get to the targets, the checks there can be
removed.

Cc: stable@kernel.org
Signed-off-by: Stefan Bader <shbader@de.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

A clear_region function is permitted to block (in practice, rare) but gets
called in rh_update_states() with a spinlock held.

The bits being marked and cleared by the above functions are used
to update the on-disk log, but are never read directly.  We can
perform these operations outside the spinlock since the
bits are only changed within one thread viz.
   - mark_region in rh_inc()
   - clear_region in rh_update_states().

So, we grab the clean_regions list items via list_splice() within the
spinlock and defer clear_region() until we iterate over the list for
deletion - similar to how the recovered_regions list is already handled.
We then move the flush() call down to ensure it encapsulates the changes
which are done by the later calls to clear_region().
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Allow invalid snapshots to be activated instead of failing.

This allows userspace to reinstate any given snapshot state - for
example after an unscheduled reboot - and clean up the invalid snapshot
at its leisure.

Cc: stable@kernel.org
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Process persistent exception store metadata IOs in a separate thread.

A snapshot may become invalid while inside generic_make_request().
A synchronous write is then needed to update the metadata while still
inside that function.  Since the introduction of
md-dm-reduce-stack-usage-with-stacked-block-devices.patch this has to
be performed by a separate thread to avoid deadlock.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

bio_alloc_bioset() will return NULL if 'num_vecs' is too large.
Use bio_get_nr_vecs() to get estimation of maximum number.

Cc: stable@kernel.org
Signed-off-by: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Fix mirror status line broken in dm-log-report-fault-status.patch:
  - space missing between two words
  - placeholder ("0") required for compatibility with a subsequent patch
  - incorrect offset parameter

Cc: stable@kernel.org
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Remove explicit module name from messages as the macro now includes it
automatically.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Use setup_timer().
Replace semaphore with mutex.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Use new KMEM_CACHE() macro and make the newly-exposed structure names more
meaningful.  Also remove some superfluous casts and inlines (let a modern
compiler be the judge).
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Remove dubious prefetch from bio_list_for_each() macro.

Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (50 commits)
  [ARM] sa1100: remove boot time RTC initialisation
  [ARM] sa1100: stop doing our own rtc management over suspend
  [ARM] 4474/1: Do not check the PSR_F_BIT in valid_user_regs
  [ARM] 4473/2:  Take the HWCAP definitions out of the elf.h file
  [ARM] pxa: move platform devices to separate header file
  [ARM] pxa: move device registration into CPU-specific file
  [ARM] pxa: remove boot time RTC initialisation
  [ARM] pxa: stop doing our own rtc management over suspend
  [ARM] 4451/1: pxa: make dma.c generic and remove cpu specific dma code
  [ARM] 4450/1: pxa: add pxa25x_init_irq() and pxa27x_init_irq()
  [ARM] 4440/1: PXA: enable the checking of ICIP2 for IRQs
  [ARM] 4438/1: PXA: remove #ifdef .. #endif from pxa_gpio_demux_handler()
  [ARM] 4437/1: PXA: move the GPIO IRQ initialization code to pxa_init_irq_gpio()
  [ARM] 4436/1: PXA: move low IRQ initialization code to pxa_init_irq_low()
  [ARM] 4435/1: PXA: remove PXA_INTERNAL_IRQS
  [ARM] 4434/1: PXA: remove PXA_IRQ_SKIP
  [ARM] pxa: Fix PXA27x suspend type validation, remove pxa_pm_prepare()
  [ARM] pxa: move pm_ops structure into CPU specific files
  [ARM] pxa: introduce cpu_is_pxaXXX macros
  [ARM] pxa: remove MMC register defines from pxa-regs.h
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6:
  security: unexport mmap_min_addr
  SELinux: use SECINITSID_NETMSG instead of SECINITSID_UNLABELED for NetLabel
  security: Protection for exploiting null dereference using mmap
  SELinux: Use %lu for inode->i_no when printing avc
  SELinux: allow preemption between transition permission checks
  selinux: introduce schedule points in policydb_destroy()
  selinux: add selinuxfs structure for object class discovery
  selinux: change sel_make_dir() to specify inode counter.
  selinux: rename sel_remove_bools() for more general usage.
  selinux: add support for querying object classes and permissions from the running policy

* master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] Fix sysfs_create_file return value handling
  [CPUFREQ] ondemand: fix tickless accounting and software coordination bug
  [CPUFREQ] ondemand: add a check to avoid negative load calculation
  [CPUFREQ] Keep userspace governor quiet when it is not being used
  [CPUFREQ] Longhaul - Proper register access
  [CPUFREQ] Kconfig powernow-k8 driver should depend on ACPI P-States driver
  [CPUFREQ] Longhaul - Replace ACPI functions with direct I/O
  [CPUFREQ] Longhaul - Remove duplicate multipliers
  [CPUFREQ] Longhaul - Embedded "conservative"
  [CPUFREQ] acpi-cpufreq: Proper ReadModifyWrite of PERF_CTL MSR
  [CPUFREQ] check return value of sysfs_create_file
  [CPUFREQ] Longhaul - Check ACPI "BM DMA in progress" bit
  [CPUFREQ] Longhaul - Move old_ratio to correct place
  [CPUFREQ] Longhaul - VT8237 support
  [CPUFREQ] Longhaul - Use all kinds of support
  [CPUFREQ] powernow-k8: clarify number of cores.

* master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart:
  [AGPGART] Hand off AGP maintainence.

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  [IA64] Support multiple CPUs going through OS_MCA
  [IA64] silence GCC ia64 unused variable warnings
  [IA64] prevent MCA when performing MMIO mmap to PCI config space
  [IA64] add sn_register_pmi_handler oemcall
  [IA64] Stop bit for brl instruction
  [IA64] SN: Correct ROM resource length for BIOS copy
  [IA64] Don't set psr.ic and psr.i simultaneously

* master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6: (34 commits)
  PCI: Only build PCI syscalls on architectures that want them
  PCI: limit pci_get_bus_and_slot to domain 0
  PCI: hotplug: acpiphp: avoid acpiphp "cannot get bridge info" PCI hotplug failure
  PCI: hotplug: acpiphp: remove hot plug parameter write to PCI host bridge
  PCI: hotplug: acpiphp: fix slot poweroff problem on systems without _PS3
  PCI: hotplug: pciehp: wait for 1 second after power off slot
  PCI: pci_set_power_state(): check for PM capabilities earlier
  PCI: cpci_hotplug: Convert to use the kthread API
  PCI: add pci_try_set_mwi
  PCI: pcie: remove SPIN_LOCK_UNLOCKED
  PCI: ROUND_UP macro cleanup in drivers/pci
  PCI: remove pci_dac_dma_... APIs
  PCI: pci-x-pci-express-read-control-interfaces cleanups
  PCI: Fix typo in include/linux/pci.h
  PCI: pci_ids, remove double or more empty lines
  PCI: pci_ids, add atheros and 3com_2 vendors
  PCI: pci_ids, reorder some entries
  PCI: i386: traps, change VENDOR to DEVICE
  PCI: ATM: lanai, change VENDOR to DEVICE
  PCI: Change all drivers to use pci_device->revision
  ...

* master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6: (61 commits)
  sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes
  sysfs: make directory dentries and inodes reclaimable
  sysfs: implement sysfs_get_dentry()
  sysfs: move sysfs_drop_dentry() to dir.c and make it static
  sysfs: restructure add/remove paths and fix inode update
  sysfs: use sysfs_mutex to protect the sysfs_dirent tree
  sysfs: consolidate sysfs spinlocks
  sysfs: make kobj point to sysfs_dirent instead of dentry
  sysfs: implement sysfs_find_dirent() and sysfs_get_dirent()
  sysfs: implement SYSFS_FLAG_REMOVED flag
  sysfs: rename sysfs_dirent->s_type to s_flags and make room for flags
  sysfs: make sysfs_drop_dentry() access inodes using ilookup()
  sysfs: Fix oops in sysfs_drop_dentry on x86_64
  sysfs: use singly-linked list for sysfs_dirent tree
  sysfs: slim down sysfs_dirent->s_active
  sysfs: move s_active functions to fs/sysfs/dir.c
  sysfs: fix root sysfs_dirent -> root dentry association
  sysfs: use iget_locked() instead of new_inode()
  sysfs: reorganize sysfs_new_indoe() and sysfs_create()
  sysfs: fix parent refcounting during rename and move
  ...

* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev: (21 commits)
  libata: remove irq_on from ata_bus_reset() and ata_std_postreset()
  ata_piix: kill incorrect invalid map value warning
  libata: add another Maxtor drive with broken NCQ to the list
  [libata] sata_mv: Fix and clean up per-chip-generation tests
  [libata] sata_mv: Convert to new exception handling (EH) infrastructure
  [libata] sata_mv: minor bug fixes, enhancements, and cleanups (prep for new EH)
  [libata] sata_mv: Minor cleanups and renaming, preparing for new EH & NCQ
  libata-link: add PMP related ATA constants
  libata-link: separate out ata_eh_handle_dev_fail()
  pata_hpt3x3: fix DMA Kconfig option to actually have a hope of working
  Add Hitachi HDS7250SASUN500G 0621KTAWSD to NCQ blacklist
  pata_scc.c: Workaround for errata A308
  libata: add FUJITSU MHV2080BH to NCQ blacklist
  pata_hpt3x3: major reworking and testing
  libata: clean up horkage handling
  libata: quirk IOMEGA ZIP 250 ATAPI FLOPPY
  libata: simplify PCI legacy SFF host handling
  pata_mpc52xx: suspend/resume support
  sata_promise: SATA hotplug support, take 2
  pata_sis: FIFO whack
  ...

* 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: (183 commits)
  [TG3]: Update version to 3.78.
  [TG3]: Add missing NVRAM strapping.
  [TG3]: Enable auto MDI.
  [TG3]: Fix the polarity bit.
  [TG3]: Fix irq_sync race condition.
  [NET_SCHED]: ematch: module autoloading
  [TCP]: tcp probe wraparound handling and other changes
  [RTNETLINK]: rtnl_link: allow specifying initial device address
  [RTNETLINK]: rtnl_link API simplification
  [VLAN]: Fix MAC address handling
  [ETH]: Validate address in eth_mac_addr
  [NET]: Fix races in net_rx_action vs netpoll.
  [AF_UNIX]: Rewrite garbage collector, fixes race.
  [NETFILTER]: {ip, nf}_conntrack_sctp: fix remotely triggerable NULL ptr dereference (CVE-2007-2876)
  [NET]: Make all initialized struct seq_operations const.
  [UDP]: Fix length check.
  [IPV6]: Remove unneeded pointer idev from addrconf_cleanup().
  [DECNET]: Another unnecessary net/tcp.h inclusion in net/dn.h
  [IPV6]: Make IPV6_{RECV,2292}RTHDR boolean options.
  [IPV6]: Do not send RH0 anymore.
  ...

Fixed up trivial conflict in Documentation/feature-removal-schedule.txt
manually.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The RTC library code contains everything necessary to set the
system time from the RTC; for similar reasons as the previous
commit, it's far better to let the RTC library code sort this
out rather than implement something which might not be
appropriate for everyone.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Remove the RTC management over a suspend/resume cycle.  As per the
corresponding PXA patch, the RTC library code handles updating
system time on resume.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  [MIPS] Rename PC speaker code
  [MIPS] Don't use genrtc.
  [MIPS] Remove unused time.c for swarm
  [MIPS] Sparse: Use NULL for pointer
  [MIPS] Fix a sparse warning in arch/mips/pci/pci.c
  [MIPS] SMTC: Interrupt mask backstop hack
  [MIPS] separate platform_device registration for VR41xx RTC
  [MIPS] Separate platform_device registration for VR41xx GPIO
  [MIPS] MIPSsim: Fix build.
  [MIPS] separate platform_device registration for VR41xx serial interface
  [MIPS] Include cacheflush.h in uncache.c
  [MIPS] Cleanup tlbdebug.h
  [MIPS] Change names of local variables to silence sparse (part 2)
  [MIPS] Workaround for a sparse warning in include/asm-mips/io.h
  [MIPS] RM: Use only phyiscal address for 82596 and 53c710
  [MIPS] Hydrogen3: Remove remaining bits of code.
  [MIPS] DEC: Fix modpost warning.
  Revert "[MIPS] DEC: Fix modpost warning."
  [MIPS] Fix resume for 64K page size on R4000 class processors.

* master.kernel.org:/pub/scm/linux/kernel/git/cooloney/blackfin-2.6: (30 commits)
  Blackfin serial driver: supporting BF548-EZKIT serial port
  Video Console: Blackfin doesnt support VGA console
  Blackfin arch: Add peripheral io API to gpio header file
  Blackfin arch: set up gpio interrupt IRQ_PJ9 for BF54x ATAPI PATA driver
  Blackfin arch: add missing CONFIG_LARGE_ALLOCS when upstream merging
  Blackfin arch: as pointed out by Robert P. J. Day, update the CPU_FREQ name to match current Kconfig
  Blackfin arch: extract the entry point from the linked kernel
  Blackfin arch: clean up some coding style issues
  Blackfin arch: combine the common code of free_initrd_mem and free_initmem
  Blackfin arch: Add Support for Peripheral PortMux and resouce allocation
  Blackfin arch: use PAGE_SIZE when doing aligns rather than hardcoded values
  Blackfin arch: fix bug set dma_address properly in dma_map_sg
  Blackfin arch: Disable CACHELINE_ALIGNED_L1 for BF54x by default
  Blackfin arch: Port the dm9000 driver to Blackfin by using the correct low-level io routines
  Blackfin arch: There is no CDPRIO Bit in the EBIU_AMGCTL Register of BF54x arch
  Blackfin arch: scrub dead code
  Blackfin arch: Fix Warning add some defines in BF54x header file
  Blackfin arch: add BF54x missing GPIO access functions
  Blackfin arch: Some memory and code optimizations - Fix SYS_IRQS
  Blackfin arch: Enable BF54x PIN/GPIO interrupts
  ...

* 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6: (26 commits)
  i2c-rpx: Remove
  i2c-mpc: work around missing-9th-clock-pulse bug
  i2c: New PMC MSP71xx TWI bus driver
  i2c-savage4: Delete many unused defines
  i2c/tsl2550: Speed up initialization
  i2c: New bus driver for the TAOS evaluation modules
  i2c-i801: Use the internal 32-byte buffer on ICH4+
  i2c-i801: Various cleanups
  i2c: Add support for the TSL2550
  i2c-pxa: Support new-style I2C drivers
  i2c-gpio: Make some internal functions static
  i2c-gpio: Add support for new-style clients
  i2c-iop3xx: Switch to static adapter numbering
  i2c-sis5595: Resolve resource conflict with sis5595
  matroxfb: Clean-up i2c header inclusions
  i2c-nforce2: Add support for SMBus block transactions
  i2c-mpc: Use i2c_add_numbered_adapter
  i2c-mv64xxx: Use i2c_add_numbered_adapter
  i2c-piix4: Add support for the ATI SB700
  i2c: New DS1682 chip driver
  ...

  It seems irq_on() in ata_bus_reset() and ata_std_postreset()
are leftover of the EDD reset. Remove them.
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

The last two slots of MAP 00b of ich6m was incorrectly marked as
reserved.  This is left over from converting the entry to allow 00b.
This causes no real problem.  It only makes the driver print annoying
warning message.  Fix it.

[patch also proferred by Pierre Tardy at the end of 2006 -jg]
Signed-off-by: Tejun Heo <htejun@gmail.com>
--
 drivers/ata/ata_piix.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
Signed-off-by: Jeff Garzik <jeff@garzik.org>

Add another Maxtor 6B200M0 drive with broken NCQ to the list.
Signed-off-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

Due to a mistake in test logic, Gen-IIE chips were being treated as
Gen-II chips in some cases.  Fix this, and in the process, clean up
IS_50XX/IS_60XX tests to the more uniform IS_GEN_{I,II,IIE} tests.
Signed-off-by: Jeff Garzik <jeff@garzik.org>

This makes hotplug, NCQ, etc. possible, and removes one of the few
remaining old-EH drivers.
Signed-off-by: Jeff Garzik <jeff@garzik.org>

* Continue replacing "CONSTANT & var" tests with "var & CONSTANT"
* Don't clear EDMA_CFG_NCQ_GO_ON_ERR on Gen-IIE, where that bit does
  not exist
* Set I/O Id field in descriptor, where present.  Appears to work
  fine on all versions, even though queueing is still disabled.
* call pci_set_mwi(), to (a) make sure cacheline size is set properly,
  and (b) enable MWI transactions
* Remove never-used handling of coalescing interrupt bits (these events
  are always masked)
Signed-off-by: Jeff Garzik <jeff@garzik.org>

This removes the old i386 setup code.  This is done as a separate patch
to avoid breaking git bisect as some of the i386 code was also used by
the old x86-64 code.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This unifies arch/*/boot (except arch/*/boot/compressed) between
i386 and x86-64, and uses the new x86 setup code for x86-64 as well.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This patch hooks the new x86 setup code into the Makefile machinery.  It
also adapts boot/tools/build.c to a two-file (as opposed to three-file)
universe, and simplifies it substantially.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Linker script to define the layout of the new x86 setup code.
Includes assert for size overflow and a misaligned setup header.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The assembly header and initialization code, and the main() routine.
main.c also contains some miscellaneous very short routines.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This is the code which actually does the switch to protected mode,
including all preparation.  It is also responsible for invoking the
boot loader hooks, if present.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>