Eric Lee / smarc-fsl-linux-kernel

01 Aug, 2011

2 commits

26 Jul, 2011

5 commits

20 Jul, 2011

2 commits

24 Mar, 2011

1 commit

07 Jan, 2011

2 commits

  • 1e1743ebe   fs: provide simple rcu-walk generic_check_acl implementation ... Browse Code »

    This simple implementation just checks for no ACLs on the inode, and
    if so, then the rcu-walk may proceed, otherwise fail it.

    This could easily be extended to put acls under RCU and check them
    under seqlock, if need be. But this implementation is enough to show
    the rcu-walk aware permissions code for path lookups is working, and
    will handle cases where there are no ACLs or ACLs in just the final
    element.

    This patch implicity converts tmpfs to rcu-aware permission check.
    Subsequent patches onvert ext*, xfs, and, btrfs. Each of these uses
    acl/permission code in a different way, so convert them all to provide
    templates and proof of concept.

    Signed-off-by: Nick Piggin

    Nick Piggin
     
  • b74c79e99   fs: provide rcu-walk aware permission i_ops ... Browse Code »

    Signed-off-by: Nick Piggin

    Nick Piggin
     

18 Aug, 2010

1 commit

22 May, 2010

1 commit

  • bb4354538   fs: xattr_handler table should be const ... Browse Code »

    The entries in xattr handler table should be immutable (ie const)
    like other operation tables.

    Later patches convert common filesystems. Uncoverted filesystems
    will still work, but will generate a compiler warning.

    Signed-off-by: Stephen Hemminger
    Signed-off-by: Al Viro

    Stephen Hemminger
     

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
     

17 Dec, 2009

1 commit

  • 1c7c474c3   make generic_acl slightly more generic ... Browse Code »

    Now that we cache the ACL pointers in the generic inode all the generic_acl
    cruft can go away and generic_acl.c can directly implement xattr handlers
    dealing with the full Posix ACL semantics for in-memory filesystems.

    Signed-off-by: Christoph Hellwig
    Signed-off-by: Al Viro

    Christoph Hellwig
     

01 Apr, 2009

1 commit

18 Jul, 2007

1 commit

  • 3bd858ab1   Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check ... Browse Code »

    Introduce is_owner_or_cap() macro in fs.h, and convert over relevant
    users to it. This is done because we want to avoid bugs in the future
    where we check for only effective fsuid of the current task against a
    file's owning uid, without simultaneously checking for CAP_FOWNER as
    well, thus violating its semantics.
    [ XFS uses special macros and structures, and in general looked ...
    untouchable, so we leave it alone -- but it has been looked over. ]

    The (current->fsuid != inode->i_uid) check in generic_permission() and
    exec_permission_lite() is left alone, because those operations are
    covered by CAP_DAC_OVERRIDE and CAP_DAC_READ_SEARCH. Similarly operations
    falling under the purview of CAP_CHOWN and CAP_LEASE are also left alone.

    Signed-off-by: Satyam Sharma
    Cc: Al Viro
    Acked-by: Serge E. Hallyn
    Signed-off-by: Linus Torvalds

    Satyam Sharma
     

30 Sep, 2006

1 commit

  • f0c8bd164   [PATCH] Generic infrastructure for acls ... Browse Code »

    The patches solve the following problem: We want to grant access to devices
    based on who is logged in from where, etc. This includes switching back and
    forth between multiple user sessions, etc.

    Using ACLs to define device access for logged-in users gives us all the
    flexibility we need in order to fully solve the problem.

    Device special files nowadays usually live on tmpfs, hence tmpfs ACLs.

    Different distros have come up with solutions that solve the problem to
    different degrees: SUSE uses a resource manager which tracks login sessions
    and sets ACLs on device inodes as appropriate. RedHat uses pam_console, which
    changes the primary file ownership to the logged-in user. Others use a set of
    groups that users must be in in order to be granted the appropriate accesses.

    The freedesktop.org project plans to implement a combination of a
    console-tracker and a HAL-device-list based solution to grant access to
    devices to users, and more distros will likely follow this approach.

    These patches have first been posted here on 2 February 2005, and again
    on 8 January 2006. We have been shipping them in SLES9 and SLES10 with
    no problems reported. The previous submission is archived here:

    http://lkml.org/lkml/2006/1/8/229
    http://lkml.org/lkml/2006/1/8/230
    http://lkml.org/lkml/2006/1/8/231

    This patch:

    Add some infrastructure for access control lists on in-memory
    filesystems such as tmpfs.

    Signed-off-by: Andreas Gruenbacher
    Cc: Hugh Dickins
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andreas Gruenbacher