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  1. 30 10月, 2008 29 次提交
  3. 23 10月, 2008 2 次提交
  5. 21 10月, 2008 1 次提交
  7. 16 10月, 2008 1 次提交
  9. 14 10月, 2008 1 次提交
  11. 11 10月, 2008 1 次提交
  13. 17 9月, 2008 2 次提交
    • L
      [XFS] Prevent direct I/O from mapping extents beyond eof · 364f358a
      由 Lachlan McIlroy 提交于 
      With the help from some tracing I found that we try to map extents beyond
eof when doing a direct I/O read. It appears that the way to inform the
generic direct I/O path (ie do_direct_IO()) that we have breached eof is
to return an unmapped buffer from xfs_get_blocks_direct(). This will cause
do_direct_IO() to jump to the hole handling code where is will check for
eof and then abort.

This problem was found because a direct I/O read was trying to map beyond
eof and was encountering delayed allocations. The delayed allocations
beyond eof are speculative allocations and they didn't get converted when
the direct I/O flushed the file because there was only enough space in the
current AG to convert and write out the dirty pages within eof. Note that
xfs_iomap_write_allocate() wont necessarily convert all the delayed
allocation passed to it - it will return after allocating the first extent
- so if the delayed allocation extends beyond eof then it will stay that
way.

SGI-PV: 983683

SGI-Modid: xfs-linux-melb:xfs-kern:31929a
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
Signed-off-by: NChristoph Hellwig <hch@infradead.org>
      364f358a
    • C
      [XFS] Fix regression introduced by remount fixup · 6efdf281
      由 Christoph Hellwig 提交于 
      Logically we would return an error in xfs_fs_remount code to prevent users
from believing they might have changed mount options using remount which
can't be changed.

But unfortunately mount(8) adds all options from mtab and fstab to the
mount arguments in some cases so we can't blindly reject options, but have
to check for each specified option if it actually differs from the
currently set option and only reject it if that's the case.

Until that is implemented we return success for every remount request, and
silently ignore all options that we can't actually change.

SGI-PV: 985710

SGI-Modid: xfs-linux-melb:xfs-kern:31908a
Signed-off-by: NChristoph Hellwig <hch@infradead.org>
Signed-off-by: NTim Shimmin <tes@sgi.com>
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
      6efdf281
  15. 25 8月, 2008 2 次提交
  17. 14 8月, 2008 1 次提交
    • D
      CRED: Introduce credential access wrappers · 9e2b2dc4
      由 David Howells 提交于 
      The patches that are intended to introduce copy-on-write credentials for 2.6.28
require abstraction of access to some fields of the task structure,
particularly for the case of one task accessing another's credentials where RCU
will have to be observed.

Introduced here are trivial no-op versions of the desired accessors for current
and other tasks so that other subsystems can start to be converted over more
easily.

Wrappers are introduced into a new header (linux/cred.h) for UID/GID,
EUID/EGID, SUID/SGID, FSUID/FSGID, cap_effective and current's subscribed
user_struct.  These wrappers are macros because the ordering between header
files mitigates against making them inline functions.

linux/cred.h is #included from linux/sched.h.

Further, XFS is modified such that it no longer defines and uses parameterised
versions of current_fs[ug]id(), thus getting rid of the namespace collision
otherwise incurred.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      9e2b2dc4