Eric Lee / smarc-fsl-linux-kernel

04 Jan, 2012

2 commits

16 Jun, 2011

1 commit

28 May, 2011

1 commit

26 May, 2011

2 commits

16 Jan, 2011

1 commit

13 Jan, 2011

1 commit

07 Jan, 2011

3 commits

  • 34286d666   fs: rcu-walk aware d_revalidate method ... Browse Code »

    Require filesystems be aware of .d_revalidate being called in rcu-walk
    mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning
    -ECHILD from all implementations.

    Signed-off-by: Nick Piggin

    Nick Piggin
     
  • fb045adb9   fs: dcache reduce branches in lookup path ... Browse Code »

    Reduce some branches and memory accesses in dcache lookup by adding dentry
    flags to indicate common d_ops are set, rather than having to check them.
    This saves a pointer memory access (dentry->d_op) in common path lookup
    situations, and saves another pointer load and branch in cases where we
    have d_op but not the particular operation.

    Patched with:

    git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i

    Signed-off-by: Nick Piggin

    Nick Piggin
     
  • fe15ce446   fs: change d_delete semantics ... Browse Code »

    Change d_delete from a dentry deletion notification to a dentry caching
    advise, more like ->drop_inode. Require it to be constant and idempotent,
    and not take d_lock. This is how all existing filesystems use the callback
    anyway.

    This makes fine grained dentry locking of dput and dentry lru scanning
    much simpler.

    Signed-off-by: Nick Piggin

    Nick Piggin
     

26 Oct, 2010

1 commit

12 Aug, 2010

1 commit

  • bec5eb614   AFS: Implement an autocell mount capability [ver #2] ... Browse Code »

    Implement the ability for the root directory of a mounted AFS filesystem to
    accept lookups of arbitrary directory names, to interpet the names as the names
    of cells, to look the cell names up in the DNS for AFSDB records and to mount
    the root.cell volume of the nominated cell on the pseudo-directory created by
    lookup.

    This facility is requested by passing:

    -o autocell

    to the mountpoint for which this is desired, usually the /afs mount.

    To use this facility, a DNS upcall program is required for AFSDB records. This
    can be obtained from:

    http://people.redhat.com/~dhowells/afs/dns.afsdb.c

    It should be compiled with -lresolv and -lkeyutils and installed as, say:

    /usr/sbin/dns.afsdb

    Then the following line needs to be added to /sbin/request-key.conf:

    create dns_resolver afsdb:* * /usr/sbin/dns.afsdb %k

    This can be tested by mounting AFS, say:

    insmod dns_resolver.ko
    insmod af-rxrpc.ko
    insmod kafs.ko rootcell=grand.central.org
    mount -t afs "#grand.central.org:root.cell." /afs -o autocell

    and doing:

    ls /afs/grand.central.org/

    which should show:

    archive/ cvs/ doc/ local/ project/ service/ software/ user/ www/

    if it works.

    Signed-off-by: Wang Lei
    Signed-off-by: David Howells
    Signed-off-by: Steve French

    wanglei
     

22 May, 2010

1 commit

  • f6d335c08   AFS: Don't put struct file on the stack ... Browse Code »

    Don't put struct file on the stack as it takes up quite a lot of space
    and violates lifetime rules for struct file.

    Rather than calling afs_readpage() indirectly from the directory routines by
    way of read_mapping_page(), split afs_readpage() to have afs_page_filler()
    that's given a key instead of a file and call read_cache_page(), specifying the
    new function directly. Use it in afs_readpages() as well.

    Also make use of this in afs_mntpt_check_symlink() too for the same reason.

    Reported-by: Al Viro
    Signed-off-by: Al Viro
    Signed-off-by: David Howells

    Al Viro
     

30 Mar, 2010

1 commit

  • 5a0e3ad6a   include cleanup: Update gfp.h and slab.h includes to prepare for breaking implic… ... Browse Code »

    …it slab.h inclusion from percpu.h

    percpu.h is included by sched.h and module.h and thus ends up being
    included when building most .c files. percpu.h includes slab.h which
    in turn includes gfp.h making everything defined by the two files
    universally available and complicating inclusion dependencies.

    percpu.h -> slab.h dependency is about to be removed. Prepare for
    this change by updating users of gfp and slab facilities include those
    headers directly instead of assuming availability. As this conversion
    needs to touch large number of source files, the following script is
    used as the basis of conversion.

    http://userweb.kernel.org/~tj/misc/slabh-sweep.py

    The script does the followings.

    * Scan files for gfp and slab usages and update includes such that
    only the necessary includes are there. ie. if only gfp is used,
    gfp.h, if slab is used, slab.h.

    * When the script inserts a new include, it looks at the include
    blocks and try to put the new include such that its order conforms
    to its surrounding. It's put in the include block which contains
    core kernel includes, in the same order that the rest are ordered -
    alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
    doesn't seem to be any matching order.

    * If the script can't find a place to put a new include (mostly
    because the file doesn't have fitting include block), it prints out
    an error message indicating which .h file needs to be added to the
    file.

    The conversion was done in the following steps.

    1. The initial automatic conversion of all .c files updated slightly
    over 4000 files, deleting around 700 includes and adding ~480 gfp.h
    and ~3000 slab.h inclusions. The script emitted errors for ~400
    files.

    2. Each error was manually checked. Some didn't need the inclusion,
    some needed manual addition while adding it to implementation .h or
    embedding .c file was more appropriate for others. This step added
    inclusions to around 150 files.

    3. The script was run again and the output was compared to the edits
    from #2 to make sure no file was left behind.

    4. Several build tests were done and a couple of problems were fixed.
    e.g. lib/decompress_*.c used malloc/free() wrappers around slab
    APIs requiring slab.h to be added manually.

    5. The script was run on all .h files but without automatically
    editing them as sprinkling gfp.h and slab.h inclusions around .h
    files could easily lead to inclusion dependency hell. Most gfp.h
    inclusion directives were ignored as stuff from gfp.h was usually
    wildly available and often used in preprocessor macros. Each
    slab.h inclusion directive was examined and added manually as
    necessary.

    6. percpu.h was updated not to include slab.h.

    7. Build test were done on the following configurations and failures
    were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
    distributed build env didn't work with gcov compiles) and a few
    more options had to be turned off depending on archs to make things
    build (like ipr on powerpc/64 which failed due to missing writeq).

    * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
    * powerpc and powerpc64 SMP allmodconfig
    * sparc and sparc64 SMP allmodconfig
    * ia64 SMP allmodconfig
    * s390 SMP allmodconfig
    * alpha SMP allmodconfig
    * um on x86_64 SMP allmodconfig

    8. percpu.h modifications were reverted so that it could be applied as
    a separate patch and serve as bisection point.

    Given the fact that I had only a couple of failures from tests on step
    6, I'm fairly confident about the coverage of this conversion patch.
    If there is a breakage, it's likely to be something in one of the arch
    headers which should be easily discoverable easily on most builds of
    the specific arch.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

    Tejun Heo
     

13 Jul, 2009

1 commit

  • dd0d9a46f   AFS: Fix compilation warning ... Browse Code »

    Fix the following warning:

    fs/afs/dir.c: In function 'afs_d_revalidate':
    fs/afs/dir.c:567: warning: 'fid.vnode' may be used uninitialized in this function
    fs/afs/dir.c:567: warning: 'fid.unique' may be used uninitialized in this function

    by marking the 'fid' variable as an uninitialized_var. The problem is
    that gcc doesn't always manage to work out that fid is always set on the
    path through the function that uses it.

    Cc: linux-afs@lists.infradead.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Artem Bityutskiy
    Signed-off-by: David Howells
    Signed-off-by: Linus Torvalds

    Artem Bityutskiy
     

28 Mar, 2009

1 commit

23 Oct, 2008

1 commit

30 Apr, 2008

1 commit

08 Feb, 2008

1 commit

29 Jan, 2008

1 commit

  • 7a224228e   vfs: Add 64 bit i_version support ... Browse Code »

    The i_version field of the inode is changed to be a 64-bit counter that
    is set on every inode creation and that is incremented every time the
    inode data is modified (similarly to the "ctime" time-stamp).
    The aim is to fulfill a NFSv4 requirement for rfc3530.
    This first part concerns the vfs, it converts the 32-bit i_version in
    the generic inode to a 64-bit, a flag is added in the super block in
    order to check if the feature is enabled and the i_version is
    incremented in the vfs.

    Signed-off-by: Mingming Cao
    Signed-off-by: Jean Noel Cordenner
    Signed-off-by: Kalpak Shah

    Jean Noel Cordenner
     

17 Jul, 2007

1 commit

22 May, 2007

1 commit

  • e8edc6e03   Detach sched.h from mm.h ... Browse Code »

    First thing mm.h does is including sched.h solely for can_do_mlock() inline
    function which has "current" dereference inside. By dealing with can_do_mlock()
    mm.h can be detached from sched.h which is good. See below, why.

    This patch
    a) removes unconditional inclusion of sched.h from mm.h
    b) makes can_do_mlock() normal function in mm/mlock.c
    c) exports can_do_mlock() to not break compilation
    d) adds sched.h inclusions back to files that were getting it indirectly.
    e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
    getting them indirectly

    Net result is:
    a) mm.h users would get less code to open, read, preprocess, parse, ... if
    they don't need sched.h
    b) sched.h stops being dependency for significant number of files:
    on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
    after patch it's only 3744 (-8.3%).

    Cross-compile tested on

    all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
    alpha alpha-up
    arm
    i386 i386-up i386-defconfig i386-allnoconfig
    ia64 ia64-up
    m68k
    mips
    parisc parisc-up
    powerpc powerpc-up
    s390 s390-up
    sparc sparc-up
    sparc64 sparc64-up
    um-x86_64
    x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig

    as well as my two usual configs.

    Signed-off-by: Alexey Dobriyan
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     

11 May, 2007

1 commit

10 May, 2007

2 commits

  • 31143d5d5   AFS: implement basic file write support ... Browse Code »

    Implement support for writing to regular AFS files, including:

    (1) write

    (2) truncate

    (3) fsync, fdatasync

    (4) chmod, chown, chgrp, utime.

    AFS writeback attempts to batch writes into as chunks as large as it can manage
    up to the point that it writes back 65535 pages in one chunk or it meets a
    locked page.

    Furthermore, if a page has been written to using a particular key, then should
    another write to that page use some other key, the first write will be flushed
    before the second is allowed to take place. If the first write fails due to a
    security error, then the page will be scrapped and reread before the second
    write takes place.

    If a page is dirty and the callback on it is broken by the server, then the
    dirty data is not discarded (same behaviour as NFS).

    Shared-writable mappings are not supported by this patch.

    [akpm@linux-foundation.org: fix a bunch of warnings]
    Signed-off-by: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Howells
     
  • 416351f28   AFS: AFS fixups ... Browse Code »

    Make some miscellaneous changes to the AFS filesystem:

    (1) Assert RCU barriers on module exit to make sure RCU has finished with
    callbacks in this module.

    (2) Correctly handle the AFS server returning a zero-length read.

    (3) Split out data zapping calls into one function (afs_zap_data).

    (4) Rename some afs_file_*() functions to afs_*() where they apply to
    non-regular files too.

    (5) Be consistent about the presentation of volume ID:vnode ID in debugging
    output.

    Signed-off-by: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Howells
     

08 May, 2007

1 commit

  • 6fe6900e1   mm: make read_cache_page synchronous ... Browse Code »

    Ensure pages are uptodate after returning from read_cache_page, which allows
    us to cut out most of the filesystem-internal PageUptodate calls.

    I didn't have a great look down the call chains, but this appears to fixes 7
    possible use-before uptodate in hfs, 2 in hfsplus, 1 in jfs, a few in
    ecryptfs, 1 in jffs2, and a possible cleared data overwritten with readpage in
    block2mtd. All depending on whether the filler is async and/or can return
    with a !uptodate page.

    Signed-off-by: Nick Piggin
    Cc: Hugh Dickins
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

27 Apr, 2007

5 commits

15 Feb, 2007

1 commit

  • cd354f1ae   [PATCH] remove many unneeded #includes of sched.h ... Browse Code »

    After Al Viro (finally) succeeded in removing the sched.h #include in module.h
    recently, it makes sense again to remove other superfluous sched.h includes.
    There are quite a lot of files which include it but don't actually need
    anything defined in there. Presumably these includes were once needed for
    macros that used to live in sched.h, but moved to other header files in the
    course of cleaning it up.

    To ease the pain, this time I did not fiddle with any header files and only
    removed #includes from .c-files, which tend to cause less trouble.

    Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
    arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
    allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
    configs in arch/arm/configs on arm. I also checked that no new warnings were
    introduced by the patch (actually, some warnings are removed that were emitted
    by unnecessarily included header files).

    Signed-off-by: Tim Schmielau
    Acked-by: Russell King
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Tim Schmielau
     

13 Feb, 2007

1 commit

  • 754661f14   [PATCH] mark struct inode_operations const 1 ... Browse Code »

    Many struct inode_operations in the kernel can be "const". Marking them const
    moves these to the .rodata section, which avoids false sharing with potential
    dirty data. In addition it'll catch accidental writes at compile time to
    these shared resources.

    Signed-off-by: Arjan van de Ven
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arjan van de Ven
     

09 Dec, 2006

1 commit

12 Oct, 2006

1 commit

03 Oct, 2006

1 commit

  • afefdbb28   [PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers ... Browse Code »

    These patches make the kernel pass 64-bit inode numbers internally when
    communicating to userspace, even on a 32-bit system. They are required
    because some filesystems have intrinsic 64-bit inode numbers: NFS3+ and XFS
    for example. The 64-bit inode numbers are then propagated to userspace
    automatically where the arch supports it.

    Problems have been seen with userspace (eg: ld.so) using the 64-bit inode
    number returned by stat64() or getdents64() to differentiate files, and
    failing because the 64-bit inode number space was compressed to 32-bits, and
    so overlaps occur.

    This patch:

    Make filldir_t take a 64-bit inode number and struct kstat carry a 64-bit
    inode number so that 64-bit inode numbers can be passed back to userspace.

    The stat functions then returns the full 64-bit inode number where
    available and where possible. If it is not possible to represent the inode
    number supplied by the filesystem in the field provided by userspace, then
    error EOVERFLOW will be issued.

    Similarly, the getdents/readdir functions now pass the full 64-bit inode
    number to userspace where possible, returning EOVERFLOW instead when a
    directory entry is encountered that can't be properly represented.

    Note that this means that some inodes will not be stat'able on a 32-bit
    system with old libraries where they were before - but it does mean that
    there will be no ambiguity over what a 32-bit inode number refers to.

    Note similarly that directory scans may be cut short with an error on a
    32-bit system with old libraries where the scan would work before for the
    same reasons.

    It is judged unlikely that this situation will occur because modern glibc
    uses 64-bit capable versions of stat and getdents class functions
    exclusively, and that older systems are unlikely to encounter
    unrepresentable inode numbers anyway.

    [akpm: alpha build fix]
    Signed-off-by: David Howells
    Cc: Trond Myklebust
    Cc: Al Viro
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Howells
     

23 Jun, 2006

1 commit

  • 090d2b185   [PATCH] read_mapping_page for address space ... Browse Code »

    Add read_mapping_page() which is used for callers that pass
    mapping->a_ops->readpage as the filler for read_cache_page. This removes
    some duplication from filesystem code.

    Signed-off-by: Pekka Enberg
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Pekka Enberg
     

29 Mar, 2006

1 commit

  • 4b6f5d20b   [PATCH] Make most file operations structs in fs/ const ... Browse Code »

    This is a conversion to make the various file_operations structs in fs/
    const. Basically a regexp job, with a few manual fixups

    The goal is both to increase correctness (harder to accidentally write to
    shared datastructures) and reducing the false sharing of cachelines with
    things that get dirty in .data (while .rodata is nicely read only and thus
    cache clean)

    Signed-off-by: Arjan van de Ven
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arjan van de Ven
     

09 Jan, 2006

1 commit

  • 54b21a799   [PATCH] fix possible PAGE_CACHE_SHIFT overflows ... Browse Code »

    We've had two instances recently of overflows when doing

    64_bit_value = (32_bit_value << PAGE_CACHE_SHIFT)

    I did a tree-wide grep of `<page_base)

    Cc: Oleg Drokin
    Cc: David Howells
    Cc: David Woodhouse
    Cc:
    Cc: Christoph Hellwig
    Cc: Anton Altaparmakov
    Cc: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Cc: Roman Zippel
    Cc:
    Cc: Miklos Szeredi
    Cc: Russell King
    Cc: Trond Myklebust
    Cc: Neil Brown
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andrew Morton