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2009-01-09Merge git://git.infradead.org/mtd-2.6Linus Torvalds
* git://git.infradead.org/mtd-2.6: (67 commits) [MTD] [MAPS] Fix printk format warning in nettel.c [MTD] [NAND] add cmdline parsing (mtdparts=) support to cafe_nand [MTD] CFI: remove major/minor version check for command set 0x0002 [MTD] [NAND] ndfc driver [MTD] [TESTS] Fix some size_t printk format warnings [MTD] LPDDR Makefile and KConfig [MTD] LPDDR extended physmap driver to support LPDDR flash [MTD] LPDDR added new pfow_base parameter [MTD] LPDDR Command set driver [MTD] LPDDR PFOW definition [MTD] LPDDR QINFO records definitions [MTD] LPDDR qinfo probing. [MTD] [NAND] pxa3xx: convert from ns to clock ticks more accurately [MTD] [NAND] pxa3xx: fix non-page-aligned reads [MTD] [NAND] fix nandsim sched.h references [MTD] [NAND] alauda: use USB API functions rather than constants [MTD] struct device - replace bus_id with dev_name(), dev_set_name() [MTD] fix m25p80 64-bit divisions [MTD] fix dataflash 64-bit divisions [MTD] [NAND] Set the fsl elbc ECCM according the settings in bootloader. ... Fixed up trivial debug conflicts in drivers/mtd/devices/{m25p80.c,mtd_dataflash.c}
2009-01-09Merge branch 'release' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (94 commits) ACPICA: hide private headers ACPICA: create acpica/ directory ACPI: fix build warning ACPI : Use RSDT instead of XSDT by adding boot option of "acpi=rsdt" ACPI: Avoid array address overflow when _CST MWAIT hint bits are set fujitsu-laptop: Simplify SBLL/SBL2 backlight handling fujitsu-laptop: Add BL power, LED control and radio state information ACPICA: delete utcache.c ACPICA: delete acdisasm.h ACPICA: Update version to 20081204. ACPICA: FADT: Update error msgs for consistency ACPICA: FADT: set acpi_gbl_use_default_register_widths to TRUE by default ACPICA: FADT parsing changes and fixes ACPICA: Add ACPI_MUTEX_TYPE configuration option ACPICA: Fixes for various ACPI data tables ACPICA: Restructure includes into public/private ACPI: remove private acpica headers from driver files ACPI: reboot.c: use new acpi_reset interface ACPICA: New: acpi_reset interface - write to reset register ACPICA: Move all public H/W interfaces to new hwxface ...
2009-01-09libata: use WARN_ON_ONCE on hot pathsTejun Heo
Convert WARN_ON() on command issue/completion paths to WARN_ON_ONCE() so that libata doesn't spam the machine even when one of those conditions triggers repeatedly. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-09CRED: Must initialise the new creds in prepare_kernel_cred()David Howells
The newly allocated creds in prepare_kernel_cred() must be initialised before get_uid() and get_group_info() can access them. They should be copied from the old credentials. Reported-by: Steve Dickson <steved@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Steve Dickson <steved@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-09CRED: Missing put_cred() in prepare_kernel_cred()David Howells
Missing put_cred() in the error handling path of prepare_kernel_cred(). Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Steve Dickson <steved@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-09Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6: parisc: export length of os_hpmc vector parisc: fix kernel crash (protection id trap) when compiling ruby1.9 parisc: Use DEFINE_SPINLOCK parisc: add uevent helper for parisc bus parisc: fix ipv6 checksum parisc: quiet palo not-found message from "which" parisc: Replace NR_CPUS in parisc code parisc: trivial fixes parisc: fix braino in commit adding __space_to_prot parisc: factor out sid to protid conversion parisc: use leX_to_cpu in place of __fswabX parisc: fix GFP_KERNEL use while atomic in unwinder parisc: remove dead BIO_VMERGE_BOUNDARY and BIO_VMERGE_MAX_SIZE definitions parisc: set_time() catch errors parisc: use the new byteorder headers parisc: drivers/parisc/: make code static parisc: lib/: make code static
2009-01-09Merge branch 'next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (22 commits) ioat: fix self test for multi-channel case dmaengine: bump initcall level to arch_initcall dmaengine: advertise all channels on a device to dma_filter_fn dmaengine: use idr for registering dma device numbers dmaengine: add a release for dma class devices and dependent infrastructure ioat: do not perform removal actions at shutdown iop-adma: enable module removal iop-adma: kill debug BUG_ON iop-adma: let devm do its job, don't duplicate free dmaengine: kill enum dma_state_client dmaengine: remove 'bigref' infrastructure dmaengine: kill struct dma_client and supporting infrastructure dmaengine: replace dma_async_client_register with dmaengine_get atmel-mci: convert to dma_request_channel and down-level dma_slave dmatest: convert to dma_request_channel dmaengine: introduce dma_request_channel and private channels net_dma: convert to dma_find_channel dmaengine: provide a common 'issue_pending_all' implementation dmaengine: centralize channel allocation, introduce dma_find_channel dmaengine: up-level reference counting to the module level ...
2009-01-09[MTD] [MAPS] Fix printk format warning in nettel.cDavid Woodhouse
MTD size is 64-bit now... Pointed out by Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-09[MTD] [NAND] add cmdline parsing (mtdparts=) support to cafe_nandPhilip Rakity
[dwmw2: updated and made to still register whole device first] Signed-off-by: Philip Rakity <pakity@yahoo.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-09[MTD] CFI: remove major/minor version check for command set 0x0002Wolfgang Grandegger
The NOR Flash memory K8P2815UQB from Samsung uses the major version number '0'. Add a quirk to cope with it. Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-01-09Merge branch 'drivers-platform' into releaseLen Brown
Conflicts: drivers/misc/Kconfig Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09Merge branch 'simplify_PRT' into releaseLen Brown
Conflicts: drivers/acpi/pci_irq.c Note that this merge disables e1d3a90846b40ad3160bf4b648d36c6badad39ac pci, acpi: reroute PCI interrupt to legacy boot interrupt equivalent Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09Merge branch 'linus' into releaseLen Brown
2009-01-09Merge branch 'suspend' into releaseLen Brown
2009-01-09Merge branch 'misc' into releaseLen Brown
Conflicts: include/acpi/acpixf.h Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09Merge branch 'fujitsu-laptop' into releaseLen Brown
2009-01-09Merge branch 'fluff' into releaseLen Brown
2009-01-09Merge branches 'release', 'bugzilla-11880', 'bugzilla-12037' and ↵Len Brown
'bugzilla-12257' into release
2009-01-09Merge branch 'battery' into releaseLen Brown
2009-01-09Merge branch 'asus-eeepc' into releaseLen Brown
2009-01-09Merge branch 'alarm' into releaseLen Brown
2009-01-09ACPICA: hide private headersLen Brown
Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09ACPICA: create acpica/ directoryLen Brown
also, delete sleep/ and delete ACPI_CFLAGS from Makefile Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09ACPI: fix build warningLen Brown
when CONFIG_RTC_DRV_CMOS=m and thus !defined(HAVE_ACPI_LEGACY_ALARM) drivers/acpi/proc.c:85: warning: ‘cmos_bcd_read’ declared ‘static’ but never defined Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09ACPI : Use RSDT instead of XSDT by adding boot option of "acpi=rsdt"Zhao Yakui
On some boxes there exist both RSDT and XSDT table. But unfortunately sometimes there exists the following error when XSDT table is used: a. 32/64X address mismatch b. The 32/64X FACS address mismatch In such case the boot option of "acpi=rsdt" is provided so that RSDT is tried instead of XSDT table when the system can't work well. http://bugzilla.kernel.org/show_bug.cgi?id=8246 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> cc:Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09ACPI: Avoid array address overflow when _CST MWAIT hint bits are setZhao Yakui
The Cx Register address obtained from the _CST object is used as the MWAIT hints if the register type is FFixedHW. And it is used to check whether the Cx type is supported or not. On some boxes the following Cx state package is obtained from _CST object: >{ ResourceTemplate () { Register (FFixedHW, 0x01, // Bit Width 0x02, // Bit Offset 0x0000000000889759, // Address 0x03, // Access Size ) }, 0x03, 0xF5, 0x015E } In such case we should use the bit[7:4] of Cx address to check whether the Cx type is supported or not. mask the MWAIT hint to avoid array address overflow Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by:Venki Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09fujitsu-laptop: Simplify SBLL/SBL2 backlight handlingTony Vroon
GBLS and GBLL only differ in the clearing of the GHKS flag, so there is no need to have two backlight level readouts. Also, per Peter Gruber, the need for the BLNF check has disappeared. As a result, cleanups can be made in the code. This has been tested on the both the S6410 and the S6420 platforms and causes no functionality regressions, on the console without X or within X. One module parameter to disable the hotkeys is dropped, as we only ever took one codepath anyway. Signed-off-by: Tony Vroon <tony@linx.net> Tested-by: Peter Gruber <nokos@gmx.net> Tested-By: Stephen Gildea <stepheng+linux@gildea.com> Acked-by: Jonathan Woithe <jwoithe@physics.adelaide.edu.au> Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-09fujitsu-laptop: Add BL power, LED control and radio state informationTony Vroon
The FUNC interface in the Fujitsu-Siemens DSDT was unused until now. It exposes state information that is now reported in additional platform files (whether the radios are killed by the hardware switch or operational, whether the machine is docked and whether the lid is open). Support for the backlight class is now extended with the ability to power the backlight on & off. Optional support for the LED class allows the keyboard headlamps found on the U810 netbook and the Fujitsu logo illumination on the P8010 notebook to be turned on & off. This was fed through checkpatch.pl and tested on the S6420, P8010 & U810 platforms. Signed-off-by: Stephen Gildea <stepheng+linux@gildea.com> Tested-by: Stephen Gildea <stepheng+linux@gildea.com> Tested-by: Julian Brown <jules@panic.cs-bristol.org.uk> Signed-off-by: Tony Vroon <tony@linx.net> Tested-by: Peter Gruber <nokos@gmx.net> Acked-by: Jonathan Woithe <jwoithe@physics.adelaide.edu.au> Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-08ACPICA: delete utcache.cLen Brown
ACPI_USE_LOCAL_CACHE will never be defined by the Linux kernel, and thus utcache.c will always be dead code. Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-08ACPICA: delete acdisasm.hLen Brown
it is referenced only #ifdef ACPI_DISASSEMBLER, which is never set by the kernel. Signed-off-by: Len Brown <len.brown@intel.com>
2009-01-08Merge branch 'for_linus' of ↵Linus Torvalds
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: (57 commits) jbd2: Fix oops in jbd2_journal_init_inode() on corrupted fs ext4: Remove "extents" mount option block: Add Kconfig help which notes that ext4 needs CONFIG_LBD ext4: Make printk's consistently prefixed with "EXT4-fs: " ext4: Add sanity checks for the superblock before mounting the filesystem ext4: Add mount option to set kjournald's I/O priority jbd2: Submit writes to the journal using WRITE_SYNC jbd2: Add pid and journal device name to the "kjournald2 starting" message ext4: Add markers for better debuggability ext4: Remove code to create the journal inode ext4: provide function to release metadata pages under memory pressure ext3: provide function to release metadata pages under memory pressure add releasepage hooks to block devices which can be used by file systems ext4: Fix s_dirty_blocks_counter if block allocation failed with nodelalloc ext4: Init the complete page while building buddy cache ext4: Don't allow new groups to be added during block allocation ext4: mark the blocks/inode bitmap beyond end of group as used ext4: Use new buffer_head flag to check uninit group bitmaps initialization ext4: Fix the race between read_inode_bitmap() and ext4_new_inode() ext4: code cleanup ...
2009-01-08Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (45 commits) [SCSI] qla2xxx: Update version number to 8.03.00-k1. [SCSI] qla2xxx: Add ISP81XX support. [SCSI] qla2xxx: Use proper request/response queues with MQ instantiations. [SCSI] qla2xxx: Correct MQ-chain information retrieval during a firmware dump. [SCSI] qla2xxx: Collapse EFT/FCE copy procedures during a firmware dump. [SCSI] qla2xxx: Don't pollute kernel logs with ZIO/RIO status messages. [SCSI] qla2xxx: Don't fallback to interrupt-polling during re-initialization with MSI-X enabled. [SCSI] qla2xxx: Remove support for reading/writing HW-event-log. [SCSI] cxgb3i: add missing include [SCSI] scsi_lib: fix DID_RESET status problems [SCSI] fc transport: restore missing dev_loss_tmo callback to LLDD [SCSI] aha152x_cs: Fix regression that keeps driver from using shared interrupts [SCSI] sd: Correctly handle 6-byte commands with DIX [SCSI] sd: DIF: Fix tagging on platforms with signed char [SCSI] sd: DIF: Show app tag on error [SCSI] Fix error handling for DIF/DIX [SCSI] scsi_lib: don't decrement busy counters when inserting commands [SCSI] libsas: fix test for negative unsigned and typos [SCSI] a2091, gvp11: kill warn_unused_result warnings [SCSI] fusion: Move a dereference below a NULL test ... Fixed up trivial conflict due to moving the async part of sd_probe around in the async probes vs using dev_set_name() in naming.
2009-01-08Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6Linus Torvalds
* 'bkl-removal' of git://git.lwn.net/linux-2.6: RTC: Remove the BKL.
2009-01-08Merge branch 'docs-next' of git://git.lwn.net/linux-2.6Linus Torvalds
* 'docs-next' of git://git.lwn.net/linux-2.6: Fix a typo in the development process document. Document handling of bad memory Document RCU and unloadable modules
2009-01-08RTC: Remove the BKL.David John
Remove calls to the BKL since concurrent access is protected by the spin lock rtc_lock. Signed-off-by: David John <davidjon@xenontk.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2009-01-08Fix a typo in the development process document.Jonathan Corbet
Reported-by: Aníbal Monsalve Salazar <anibal@debian.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2009-01-08Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6: regulator: fix kernel-doc warnings regulator: catch some registration errors regulator: Add basic DocBook manual regulator: Fix some kerneldoc rendering issues regulator: Add missing kerneldoc regulator: Clean up kerneldoc warnings regulator: Remove extraneous kerneldoc annotations regulator: init/link earlier regulator: move set_machine_constraints after regulator device initialization regulator: da903x: make da903x_is_enabled return 0 or 1 regulator: da903x: add '\n' to error messages regulator: sysfs attribute reduction (v2) regulator: code shrink (v2) regulator: improved mode error checks regulator: enable/disable refcounting regulator: struct device - replace bus_id with dev_name(), dev_set_name()
2009-01-08Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (84 commits) wimax: fix kernel-doc for debufs_dentry member of struct wimax_dev net: convert pegasus driver to net_device_ops bnx2x: Prevent eeprom set when driver is down net: switch kaweth driver to netdevops pcnet32: round off carrier watch timer i2400m/usb: wrap USB power saving in #ifdef CONFIG_PM wimax: testing for rfkill support should also test for CONFIG_RFKILL_MODULE wimax: fix kconfig interactions with rfkill and input layers wimax: fix '#ifndef CONFIG_BUG' layout to avoid warning r6040: bump release number to 0.20 r6040: warn about MAC address being unset r6040: check PHY status when bringing interface up r6040: make printks consistent with DRV_NAME gianfar: Fixup use of BUS_ID_SIZE mlx4_en: Returning real Max in get_ringparam mlx4_en: Consider inline packets on completion netdev: bfin_mac: enable bfin_mac net dev driver for BF51x qeth: convert to net_device_ops vlan: add neigh_setup dm9601: warn on invalid mac address ...
2009-01-08Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* master.kernel.org:/home/rmk/linux-2.6-arm: (23 commits) [ARM] fix pxa930_trkball build errors [ARM] fix netx [ARM] fix pnx4008 [ARM] fix pxa [ARM] remove missed CLPS7500 defconfig [ARM] clps711x: fix warning in edb7211-mm.c [ARM] clps711x: fix warning in fortunet [ARM] fix AT91, davinci, h720x, ks8695, msm, mx2, mx3, netx, omap1, omap2, pxa, s3c [ARM] Fix realview build [ARM] 5357/1: Kirkwood: add missing ge01 tclk initialization [ARM] 5358/1: AT2440EVB: Use new include path of mci.h [ARM] 5361/1: mv78xx0: fix compilation error [ARM] 5360/1: Orion: fix compilation error [ARM] 5359/1: Kirkwood: fix compilation error [ARM] S3C64XX: Fix EINT group macro definition [ARM] Ensure CONFIG_SERIAL_SAMSUNG_UARTS is always set. [ARM] S3C24XX: Add gpio_to_irq implementation [ARM] S3C24XX: Add gpio_to_irq() facility [ARM] footbridge: dc21285.c warning fixes [ARM] footbridge: add isa_init_irq() to common header ...
2009-01-08Merge branch 'for-linus' of git://neil.brown.name/mdLinus Torvalds
* 'for-linus' of git://neil.brown.name/md: md: don't retry recovery of raid1 that fails due to error on source drive. md: Allow md devices to be created by name. md: make devices disappear when they are no longer needed. md: centralise all freeing of an 'mddev' in 'md_free' md: move allocation of ->queue from mddev_find to md_probe md: need another print_sb for mdp_superblock_1 md: use list_for_each_entry macro directly md: raid0: make hash_spacing and preshift sector-based. md: raid0: Represent the size of strip zones in sectors. md: raid0 create_strip_zones(): Add KERN_INFO/KERN_ERR to printk's. md: raid0 create_strip_zones(): Make two local variables sector-based. md: raid0: Represent zone->zone_offset in sectors. md: raid0: Represent device offset in sectors. md: raid0_make_request(): Replace local variable block by sector. md: raid0_make_request(): Remove local variable chunk_size. md: raid0_make_request(): Replace chunksize_bits by chunksect_bits. md: use sysfs_notify_dirent to notify changes to md/sync_action. md: fix bitmap-on-external-file bug.
2009-01-08Merge branch 'devel'Russell King
2009-01-08Merge branch 'upstream-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev * 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev: libata: clean up the SFF code for coding style libata: Add 32bit PIO support [libata] ahci: Withdraw IGN_SERR_INTERNAL for SB800 SATA pata_hpt366: reimplement mode programming [libata] pata_hpt3x3: correct _freeze() function declaration libata: Add special ata_pio_need_iordy() handling for Compact Flash. pata_platform: __pata_platform_remove() shouldn't be in discard section sata_sil24: remove unused sil24_port_multiplier [libata] ahci: Add SATA GEN3 related messages ata_piix: save, use saved and restore IOCFG pata_ali: Fix and workaround for FIFO DMA bug pata_ali: force initialise a few bits pata_hpt3x3: Workarounds for chipset
2009-01-08Merge branch 'next-footbridge' of git://aeryn.fluff.org.uk/bjdooks/linuxRussell King
2009-01-08libata: clean up the SFF code for coding styleAlan Cox
Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2009-01-08libata: Add 32bit PIO supportAlan Cox
This matters for some controllers and in one or two cases almost doubles PIO performance. Add a bmdma32 operations set we can inherit and activate it for some controllers Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2009-01-08[libata] ahci: Withdraw IGN_SERR_INTERNAL for SB800 SATAShane Huang
There is an issue in ATI SB600/SB700 SATA that PxSERR.E should not be set on some conditions, which will lead to many SATA ODD error messages. commit 55a61604cd1354e1783364e1c901034f2f474b7d is the workaround. Since SB800 fixed this HW issue, IGN_SERR_INTERNAL should be withdrawn for SB800. Signed-off-by: Shane Huang <shane.huang@amd.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2009-01-09md: don't retry recovery of raid1 that fails due to error on source drive.NeilBrown
If a raid1 has only one working drive and it has a sector which gives an error on read, then an attempt to recover onto a spare will fail, but as the single remaining drive is not removed from the array, the recovery will be immediately re-attempted, resulting in an infinite recovery loop. So detect this situation and don't retry recovery once an error on the lone remaining drive is detected. Allow recovery to be retried once every time a spare is added in case the problem wasn't actually a media error. Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09md: Allow md devices to be created by name.NeilBrown
Using sequential numbers to identify md devices is somewhat artificial. Using names can be a lot more user-friendly. Also, creating md devices by opening the device special file is a bit awkward. So this patch provides a new option for creating and naming devices. Writing a name such as "md_home" to /sys/modules/md_mod/parameters/new_array will cause an array with that name to be created. It will appear in /sys/block/ /proc/partitions and /proc/mdstat as 'md_home'. It will have an arbitrary minor number allocated. md devices that a created by an open are destroyed on the last close when the device is inactive. For named md devices, they will not be destroyed until the array is explicitly stopped, either with the STOP_ARRAY ioctl or by writing 'clear' to /sys/block/md_XXXX/md/array_state. The name of the array must start 'md_' to avoid conflict with other devices. Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09md: make devices disappear when they are no longer needed.NeilBrown
Currently md devices, once created, never disappear until the module is unloaded. This is essentially because the gendisk holds a reference to the mddev, and the mddev holds a reference to the gendisk, this a circular reference. If we drop the reference from mddev to gendisk, then we need to ensure that the mddev is destroyed when the gendisk is destroyed. However it is not possible to hook into the gendisk destruction process to enable this. So we drop the reference from the gendisk to the mddev and destroy the gendisk when the mddev gets destroyed. However this has a complication. Between the call __blkdev_get->get_gendisk->kobj_lookup->md_probe and the call __blkdev_get->md_open there is no obvious way to hold a reference on the mddev any more, so unless something is done, it will disappear and gendisk will be destroyed prematurely. Also, once we decide to destroy the mddev, there will be an unlockable moment before the gendisk is unlinked (blk_unregister_region) during which a new reference to the gendisk can be created. We need to ensure that this reference can not be used. i.e. the ->open must fail. So: 1/ in md_probe we set a flag in the mddev (hold_active) which indicates that the array should be treated as active, even though there are no references, and no appearance of activity. This is cleared by md_release when the device is closed if it is no longer needed. This ensures that the gendisk will survive between md_probe and md_open. 2/ In md_open we check if the mddev we expect to open matches the gendisk that we did open. If there is a mismatch we return -ERESTARTSYS and modify __blkdev_get to retry from the top in that case. In the -ERESTARTSYS sys case we make sure to wait until the old gendisk (that we succeeded in opening) is really gone so we loop at most once. Some udev configurations will always open an md device when it first appears. If we allow an md device that was just created by an open to disappear on an immediate close, then this can race with such udev configurations and result in an infinite loop the device being opened and closed, then re-open due to the 'ADD' even from the first open, and then close and so on. So we make sure an md device, once created by an open, remains active at least until some md 'ioctl' has been made on it. This means that all normal usage of md devices will allow them to disappear promptly when not needed, but the worst that an incorrect usage will do it cause an inactive md device to be left in existence (it can easily be removed). As an array can be stopped by writing to a sysfs attribute echo clear > /sys/block/mdXXX/md/array_state we need to use scheduled work for deleting the gendisk and other kobjects. This allows us to wait for any pending gendisk deletion to complete by simply calling flush_scheduled_work(). Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09md: centralise all freeing of an 'mddev' in 'md_free'NeilBrown
md_free is the .release handler for the md kobj_type. So it makes sense to release all the objects referenced by the mddev in there, rather than just prior to calling kobject_put for what we think is the last time. Signed-off-by: NeilBrown <neilb@suse.de>