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Commits on Apr 3, 2009
  1. @torvalds

    Merge branch 'ext3-latency-fixes' of git://git.kernel.org/pub/scm/lin…

    …ux/kernel/git/tytso/ext4
    
    * 'ext3-latency-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
      ext3: Add replace-on-rename hueristics for data=writeback mode
      ext3: Add replace-on-truncate hueristics for data=writeback mode
      ext3: Use WRITE_SYNC for commits which are caused by fsync()
      block_write_full_page: Use synchronous writes for WBC_SYNC_ALL writebacks
    torvalds committed Apr 3, 2009
  2. @torvalds

    Merge branch 'for-linus' of 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: (32 commits)
      regulator: twl4030 VAUX3 supports 3.0V
      regulator: Support disabling of unused regulators by machines
      regulator: Don't increment use_count for boot_on regulators
      twl4030-regulator: expose VPLL2
      regulator: refcount fixes
      regulator: Don't warn if we failed to get a regulator
      regulator: Allow boot_on regulators to be disabled by clients
      regulator: Implement list_voltage for WM835x LDOs and DCDCs
      twl4030-regulator: list more VAUX4 voltages
      regulator: Don't warn on omitted voltage constraints
      regulator: Implement list_voltage() for WM8400 DCDCs and LDOs
      MMC: regulator utilities
      regulator: twl4030 voltage enumeration (v2)
      regulator: twl4030 regulators
      regulator: get_status() grows kerneldoc
      regulator: enumerate voltages (v2)
      regulator: Fix get_mode() for WM835x DCDCs
      regulator: Allow regulators to set the initial operating mode
      regulator: Suggest use of datasheet supply or pin names for consumers
      regulator: email - update email address and regulator webpage.
      ...
    torvalds committed Apr 3, 2009
  3. @torvalds

    Merge git://git.infradead.org/iommu-2.6

    * git://git.infradead.org/iommu-2.6:
      intel-iommu: Fix address wrap on 32-bit kernel.
      intel-iommu: Enable DMAR on 32-bit kernel.
      intel-iommu: fix PCI device detach from virtual machine
      intel-iommu: VT-d page table to support snooping control bit
      iommu: Add domain_has_cap iommu_ops
      intel-iommu: Snooping control support
    
    Fixed trivial conflicts in arch/x86/Kconfig and drivers/pci/intel-iommu.c
    torvalds committed Apr 3, 2009
  4. @torvalds

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.…

    …6-fscache
    
    * git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-fscache: (41 commits)
      NFS: Add mount options to enable local caching on NFS
      NFS: Display local caching state
      NFS: Store pages from an NFS inode into a local cache
      NFS: Read pages from FS-Cache into an NFS inode
      NFS: nfs_readpage_async() needs to be accessible as a fallback for local caching
      NFS: Add read context retention for FS-Cache to call back with
      NFS: FS-Cache page management
      NFS: Add some new I/O counters for FS-Cache doing things for NFS
      NFS: Invalidate FsCache page flags when cache removed
      NFS: Use local disk inode cache
      NFS: Define and create inode-level cache objects
      NFS: Define and create superblock-level objects
      NFS: Define and create server-level objects
      NFS: Register NFS for caching and retrieve the top-level index
      NFS: Permit local filesystem caching to be enabled for NFS
      NFS: Add FS-Cache option bit and debug bit
      NFS: Add comment banners to some NFS functions
      FS-Cache: Make kAFS use FS-Cache
      CacheFiles: A cache that backs onto a mounted filesystem
      CacheFiles: Export things for CacheFiles
      ...
    torvalds committed Apr 3, 2009
  5. @torvalds

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

    * git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (36 commits)
      dm: set queue ordered mode
      dm: move wait queue declaration
      dm: merge pushback and deferred bio lists
      dm: allow uninterruptible wait for pending io
      dm: merge __flush_deferred_io into caller
      dm: move bio_io_error into __split_and_process_bio
      dm: rename __split_bio
      dm: remove unnecessary struct dm_wq_req
      dm: remove unnecessary work queue context field
      dm: remove unnecessary work queue type field
      dm: bio list add bio_list_add_head
      dm snapshot: persistent fix dtr cleanup
      dm snapshot: move status to exception store
      dm snapshot: move ctr parsing to exception store
      dm snapshot: use DMEMIT macro for status
      dm snapshot: remove dm_snap header
      dm snapshot: remove dm_snap header use
      dm exception store: move cow pointer
      dm exception store: move chunk_fields
      dm exception store: move dm_target pointer
      ...
    torvalds committed Apr 3, 2009
  6. @torvalds

    Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd

    * 'for-linus' of git://git.open-osd.org/linux-open-osd:
      fs: Add exofs to Kernel build
      exofs: Documentation
      exofs: export_operations
      exofs: super_operations and file_system_type
      exofs: dir_inode and directory operations
      exofs: address_space_operations
      exofs: symlink_inode and fast_symlink_inode operations
      exofs: file and file_inode operations
      exofs: Kbuild, Headers and osd utils
    torvalds committed Apr 3, 2009
  7. @torvalds

    Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

    * 'for-linus' of git://oss.sgi.com/xfs/xfs: (61 commits)
      Revert "xfs: increase the maximum number of supported ACL entries"
      xfs: cleanup uuid handling
      xfs: remove m_attroffset
      xfs: fix various typos
      xfs: pagecache usage optimization
      xfs: remove m_litino
      xfs: kill ino64 mount option
      xfs: kill mutex_t typedef
      xfs: increase the maximum number of supported ACL entries
      xfs: factor out code to find the longest free extent in the AG
      xfs: kill VN_BAD
      xfs: kill vn_atime_* helpers.
      xfs: cleanup xlog_bread
      xfs: cleanup xlog_recover_do_trans
      xfs: remove another leftover of the old inode log item format
      xfs: cleanup log unmount handling
      Fix xfs debug build breakage by pushing xfs_error.h after
      xfs: include header files for prototypes
      xfs: make symbols static
      xfs: move declaration to header file
      ...
    torvalds committed Apr 3, 2009
  8. @torvalds

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6

    * git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6: (23 commits)
      parisc: move dereference_function_descriptor to process.c
      parisc: Move kernel Elf_Fdesc define to <asm/elf.h>
      parisc: fix build when ARCH_HAS_KMAP
      parisc: fix "make tar-pkg"
      parisc: drivers: fix warnings
      parisc: select BUG always
      parisc: asm/pdc.h should include asm/page.h
      parisc: led: remove proc_dir_entry::owner
      parisc: fix macro expansion in atomic.h
      parisc: iosapic: fix build breakage
      parisc: oops_enter()/oops_exit() in die()
      parisc: document light weight syscall ABI
      parisc: blink all or loadavg LEDs on oops
      parisc: add ftrace (function and graph tracer) functionality
      parisc: simplify sys_clone()
      parisc: add LATENCYTOP_SUPPORT and CONFIG_STACKTRACE_SUPPORT
      parisc: allow to build with 16k default kernel page size
      parisc: expose 32/64-bit capabilities in cpuinfo
      parisc: use constants instead of numbers in assembly
      parisc: fix usage of 32bit PTE page table entries on 32bit kernels
      ...
    torvalds committed Apr 3, 2009
  9. @torvalds

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/rtc-parisc

    * git://git.kernel.org/pub/scm/linux/kernel/git/kyle/rtc-parisc:
      powerpc/ps3: Add rtc-ps3
      powerpc: Hook up rtc-generic, and kill rtc-ppc
      m68k: Hook up rtc-generic
      parisc: rtc: Rename rtc-parisc to rtc-generic
      parisc: rtc: Add missing module alias
      parisc: rtc: platform_driver_probe() fixups
      parisc: rtc: get_rtc_time() returns unsigned int
    torvalds committed Apr 3, 2009
  10. @torvalds

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

    …/git/jack/linux-udf-2.6
    
    * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-udf-2.6:
      udf: Don't write integrity descriptor too often
      udf: Try anchor in block 256 first
      udf: Some type fixes and cleanups
      udf: use hardware sector size
      udf: fix novrs mount option
      udf: Fix oops when invalid character in filename occurs
      udf: return f_fsid for statfs(2)
      udf: Add checks to not underflow sector_t
      udf: fix default mode and dmode options handling
      udf: fix sparse warnings:
      udf: unsigned last[i] cannot be less than 0
      udf: implement mode and dmode mounting options
      udf: reduce stack usage of udf_get_filename
      udf: reduce stack usage of udf_load_pvoldesc
      Fix the udf code not to pass structs on stack where possible.
      Remove struct typedefs from fs/udf/ecma_167.h et al.
    torvalds committed Apr 3, 2009
  11. @torvalds

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/rcu-doc-2.6

    * git://git.kernel.org/pub/scm/linux/kernel/git/davem/rcu-doc-2.6:
      Doc: Fix spelling in RCU/rculist_nulls.txt.
      Doc: Fix wrong API example usage of call_rcu().
      Doc: Fix missing whitespaces in RCU documentation.
    torvalds committed Apr 3, 2009
  12. @mita @torvalds

    mm: fix misuse of debug_kmap_atomic

    Commit 7ca43e7 ("mm: use debug_kmap_atomic")
    introduced some debug_kmap_atomic() in wrong places.
    
    Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    mita committed with torvalds Apr 2, 2009
  13. @kumargala @torvalds

    Fix highmem PPC build failure

    Commit f4112de ("mm: introduce
    debug_kmap_atomic") broke PPC builds with CONFIG_HIGHMEM=y:
    
       CC      init/main.o
      In file included from include/linux/highmem.h:25,
                       from include/linux/pagemap.h:11,
                       from include/linux/mempolicy.h:63,
                       from init/main.c:53:
      arch/powerpc/include/asm/highmem.h: In function 'kmap_atomic_prot':
      arch/powerpc/include/asm/highmem.h:98: error: implicit declaration of function 'debug_kmap_atomic'
      In file included from include/linux/pagemap.h:11,
                       from include/linux/mempolicy.h:63,
                       from init/main.c:53:
      include/linux/highmem.h: At top level:
      include/linux/highmem.h:196: warning: conflicting types for 'debug_kmap_atomic'
      include/linux/highmem.h:196: error: static declaration of 'debug_kmap_atomic' follows non-static declaration
      include/asm/highmem.h:98: error: previous implicit declaration of 'debug_kmap_atomic' was here
      make[1]: *** [init/main.o] Error 1
      make: *** [init] Error 2
    
    Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
    Acked-by: Akinobu Mita <akinobu.mita@gmail.com>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    kumargala committed with torvalds Apr 1, 2009
  14. @torvalds

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

    * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
      crypto: ixp4xx - Fix handling of chained sg buffers
      crypto: shash - Fix unaligned calculation with short length
      hwrng: timeriomem - Use phys address rather than virt
    torvalds committed Apr 3, 2009
  15. @torvalds

    Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…

    …/git/gerg/m68knommu
    
    * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu: (41 commits)
      m68knommu: improve compile arch switch settings
      m68knommu: fix 5407 ColdFire UART vector setup
      m68knommu: fix 5307 ColdFire UART vector setup
      m68knommu: fix 5249 ColdFire UART vector setup
      m68knommu: fix 5249 ColdFire UART setup
      m68knommu: fix end of uart table marker
      m68knommu: switch to using generic_handle_irq()
      m68k: merge the mmu and non-mmu versions of tlbflush.h
      m68knommu: introduce basic clk infrastructure
      m68k: merge the mmu and non-mmu versions of module.h
      m68knommu: add missing interrupt line definition for UART 2
      m68k: merge the mmu and non-mmu versions of mmu_context.h
      m68k: merge the mmu and non-mmu versions of current.h
      m68k: merge the mmu and non-mmu versions of div64.h
      m68k: merge the mmu and non-mmu versions of bugs.h
      m68k: merge the mmu and non-mmu versions of bug.h
      m68k: use the mmu version of cache.h for m68knommu as well
      m68k: use the mmu version of bootinfo.h for m68knommu as well
      m68k: merge the mmu and non-mmu versions of fb.h
      m68k: merge the mmu and non-mmu versions of segment.h
      ...
    torvalds committed Apr 3, 2009
  16. @torvalds

    Merge branch 'for-linus' of git://neil.brown.name/md

    * 'for-linus' of git://neil.brown.name/md: (53 commits)
      md/raid5 revise rules for when to update metadata during reshape
      md/raid5: minor code cleanups in make_request.
      md: remove CONFIG_MD_RAID_RESHAPE config option.
      md/raid5: be more careful about write ordering when reshaping.
      md: don't display meaningless values in sysfs files resync_start and sync_speed
      md/raid5: allow layout and chunksize to be changed on active array.
      md/raid5: reshape using largest of old and new chunk size
      md/raid5: prepare for allowing reshape to change layout
      md/raid5: prepare for allowing reshape to change chunksize.
      md/raid5: clearly differentiate 'before' and 'after' stripes during reshape.
      Documentation/md.txt update
      md: allow number of drives in raid5 to be reduced
      md/raid5: change reshape-progress measurement to cope with reshaping backwards.
      md: add explicit method to signal the end of a reshape.
      md/raid5: enhance raid5_size to work correctly with negative delta_disks
      md/raid5: drop qd_idx from r6_state
      md/raid6: move raid6 data processing to raid6_pq.ko
      md: raid5 run(): Fix max_degraded for raid level 4.
      md: 'array_size' sysfs attribute
      md: centralize ->array_sectors modifications
      ...
    torvalds committed Apr 3, 2009
  17. @torvalds

    Merge master.kernel.org:/home/rmk/linux-2.6-arm

    * master.kernel.org:/home/rmk/linux-2.6-arm:
      [ARM] fix build-breaking 7a192ec commit
      ARM: Add SMSC911X support to Overo platform (V2)
      arm: update omap_ldp defconfig to use smsc911x
      arm: update realview defconfigs to use smsc911x
      arm: update pcm037 defconfig to use smsc911x
      arm: convert omap ldp platform to use smsc911x
      arm: convert realview platform to use smsc911x
      arm: convert pcm037 platform to use smsc911x
      [ARM] 5444/1: ARM: Realview: Fix event-device multiplicators in localtimer.c
      [ARM] 5442/1: pxa/cm-x255: fix reverse RDY gpios in PCMCIA driver
      [ARM] 5441/1: Use pr_err on error paths in at91 pm
      [ARM] 5440/1: Fix VFP state corruption due to preemption during VFP exceptions
      [ARM] 5439/1: Do not clear bit 10 of DFSR during abort handling on ARMv6
      [ARM] 5437/1: Add documentation for "nohlt" kernel parameter
      [ARM] 5436/1: ARM: OMAP: Fix compile for rx51
      [ARM] arch_reset() now takes a second parameter
      [ARM] Kirkwood: small L2 code cleanup
      [ARM] Kirkwood: invalidate L2 cache before enabling it
    torvalds committed Apr 3, 2009
  18. @torvalds

    Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/linux-hdreg-…

    …h-cleanup
    
    * git://git.kernel.org/pub/scm/linux/kernel/git/bart/linux-hdreg-h-cleanup:
      remove <linux/ata.h> include from <linux/hdreg.h>
      include/linux/hdreg.h: remove unused defines
      isd200: use ATA_* defines instead of *_STAT and *_ERR ones
      include/linux/hdreg.h: cover WIN_* and friends with #ifndef/#endif __KERNEL__
      aoe: WIN_* -> ATA_CMD_*
      isd200: WIN_* -> ATA_CMD_*
      include/linux/hdreg.h: cover struct hd_driveid with #ifndef/#endif __KERNEL__
      xsysace: make it 'struct hd_driveid'-free
      ubd_kern: make it 'struct hd_driveid'-free
      isd200: make it 'struct hd_driveid'-free
    torvalds committed Apr 3, 2009
  19. NFS: Add mount options to enable local caching on NFS

    Add NFS mount options to allow the local caching support to be enabled.
    
    The attached patch makes it possible for the NFS filesystem to be told to make
    use of the network filesystem local caching service (FS-Cache).
    
    To be able to use this, a recent nfsutils package is required.
    
    There are three variant NFS mount options that can be added to a mount command
    to control caching for a mount.  Only the last one specified takes effect:
    
     (*) Adding "fsc" will request caching.
    
     (*) Adding "fsc=<string>" will request caching and also specify a uniquifier.
    
     (*) Adding "nofsc" will disable caching.
    
    For example:
    
    	mount warthog:/ /a -o fsc
    
    The cache of a particular superblock (NFS FSID) will be shared between all
    mounts of that volume, provided they have the same connection parameters and
    are not marked 'nosharecache'.
    
    Where it is otherwise impossible to distinguish superblocks because all the
    parameters are identical, but the 'nosharecache' option is supplied, a
    uniquifying string must be supplied, else only the first mount will be
    permitted to use the cache.
    
    If there's a key collision, then the second mount will disable caching and give
    a warning into the kernel log.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  20. NFS: Display local caching state

    Display the local caching state in /proc/fs/nfsfs/volumes.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  21. NFS: Store pages from an NFS inode into a local cache

    Store pages from an NFS inode into the cache data storage object associated
    with that inode.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  22. NFS: Read pages from FS-Cache into an NFS inode

    Read pages from an FS-Cache data storage object representing an inode into an
    NFS inode.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  23. NFS: nfs_readpage_async() needs to be accessible as a fallback for lo…

    …cal caching
    
    nfs_readpage_async() needs to be non-static so that it can be used as a
    fallback for the local on-disk caching should an EIO crop up when reading the
    cache.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  24. NFS: Add read context retention for FS-Cache to call back with

    Add read context retention so that FS-Cache can call back into NFS when a read
    operation on the cache fails EIO rather than reading data.  This permits NFS to
    then fetch the data from the server instead using the appropriate security
    context.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  25. NFS: FS-Cache page management

    FS-Cache page management for NFS.  This includes hooking the releasing and
    invalidation of pages marked with PG_fscache (aka PG_private_2) and waiting for
    completion of the write-to-cache flag (PG_fscache_write aka PG_owner_priv_2).
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  26. NFS: Add some new I/O counters for FS-Cache doing things for NFS

    Add some new NFS I/O counters for FS-Cache doing things for NFS.  A new line is
    emitted into /proc/pid/mountstats if caching is enabled that looks like:
    
    	fsc: <rok> <rfl> <wok> <wfl> <unc>
    
    Where <rok> is the number of pages read successfully from the cache, <rfl> is
    the number of failed page reads against the cache, <wok> is the number of
    successful page writes to the cache, <wfl> is the number of failed page writes
    to the cache, and <unc> is the number of NFS pages that have been disconnected
    from the cache.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  27. NFS: Invalidate FsCache page flags when cache removed

    Invalidate the FsCache page flags on the pages belonging to an inode when the
    cache backing that NFS inode is removed.
    
    This allows a live cache to be withdrawn.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  28. NFS: Use local disk inode cache

    Bind data storage objects in the local cache to NFS inodes.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  29. NFS: Define and create inode-level cache objects

    Define and create inode-level cache data storage objects (as managed by
    nfs_inode structs).
    
    Each inode-level object is created in a superblock-level index object and is
    itself a data storage object into which pages from the inode are stored.
    
    The inode object key is the NFS file handle for the inode.
    
    The inode object is given coherency data to carry in the auxiliary data
    permitted by the cache.  This is a sequence made up of:
    
     (1) i_mtime from the NFS inode.
    
     (2) i_ctime from the NFS inode.
    
     (3) i_size from the NFS inode.
    
     (4) change_attr from the NFSv4 attribute data.
    
    As the cache is a persistent cache, the auxiliary data is checked when a new
    NFS in-memory inode is set up that matches an already existing data storage
    object in the cache.  If the coherency data is the same, the on-disk object is
    retained and used; if not, it is scrapped and a new one created.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  30. NFS: Define and create superblock-level objects

    Define and create superblock-level cache index objects (as managed by
    nfs_server structs).
    
    Each superblock object is created in a server level index object and is itself
    an index into which inode-level objects are inserted.
    
    Ideally there would be one superblock-level object per server, and the former
    would be folded into the latter; however, since the "nosharecache" option
    exists this isn't possible.
    
    The superblock object key is a sequence consisting of:
    
     (1) Certain superblock s_flags.
    
     (2) Various connection parameters that serve to distinguish superblocks for
         sget().
    
     (3) The volume FSID.
    
     (4) The security flavour.
    
     (5) The uniquifier length.
    
     (6) The uniquifier text.  This is normally an empty string, unless the fsc=xyz
         mount option was used to explicitly specify a uniquifier.
    
    The key blob is of variable length, depending on the length of (6).
    
    The superblock object is given no coherency data to carry in the auxiliary data
    permitted by the cache.  It is assumed that the superblock is always coherent.
    
    This patch also adds uniquification handling such that two otherwise identical
    superblocks, at least one of which is marked "nosharecache", won't end up
    trying to share the on-disk cache.  It will be possible to manually provide a
    uniquifier through a mount option with a later patch to avoid the error
    otherwise produced.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  31. NFS: Define and create server-level objects

    Define and create server-level cache index objects (as managed by nfs_client
    structs).
    
    Each server object is created in the NFS top-level index object and is itself
    an index into which superblock-level objects are inserted.
    
    Ideally there would be one superblock-level object per server, and the former
    would be folded into the latter; however, since the "nosharecache" option
    exists this isn't possible.
    
    The server object key is a sequence consisting of:
    
     (1) NFS version
    
     (2) Server address family (eg: AF_INET or AF_INET6)
    
     (3) Server port.
    
     (4) Server IP address.
    
    The key blob is of variable length, depending on the length of (4).
    
    The server object is given no coherency data to carry in the auxiliary data
    permitted by the cache.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  32. NFS: Register NFS for caching and retrieve the top-level index

    Register NFS for caching and retrieve the top-level cache index object cookie.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  33. NFS: Permit local filesystem caching to be enabled for NFS

    Permit local filesystem caching to be enabled for NFS in the kernel
    configuration.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  34. NFS: Add FS-Cache option bit and debug bit

    Add FS-Cache option bit to nfs_server struct.  This is set to indicate local
    on-disk caching is enabled for a particular superblock.
    
    Also add debug bit for local caching operations.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
  35. NFS: Add comment banners to some NFS functions

    Add comment banners to some NFS functions so that they can be modified by the
    NFS fscache patches for further information.
    
    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Steve Dickson <steved@redhat.com>
    Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
    Acked-by: Al Viro <viro@zeniv.linux.org.uk>
    Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
    David Howells committed Apr 3, 2009
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