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  1. 04 1月, 2012 4 次提交
  3. 02 12月, 2011 1 次提交
    • A
      ocfs2: avoid unaligned access to dqc_bitmap · 93925579
      由 Akinobu Mita 提交于 
      The dqc_bitmap field of struct ocfs2_local_disk_chunk is 32-bit aligned,
but not 64-bit aligned.  The dqc_bitmap is accessed by ocfs2_set_bit(),
ocfs2_clear_bit(), ocfs2_test_bit(), or ocfs2_find_next_zero_bit().  These
are wrapper macros for ext2_*_bit() which need to take an unsigned long
aligned address (though some architectures are able to handle unaligned
address correctly)

So some 64bit architectures may not be able to access the dqc_bitmap
correctly.

This avoids such unaligned access by using another wrapper functions for
ext2_*_bit().  The code is taken from fs/ext4/mballoc.c which also need to
handle unaligned bitmap access.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Acked-by: NJoel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJoel Becker <jlbec@evilplan.org>
      93925579
  5. 17 11月, 2011 7 次提交
  7. 02 11月, 2011 3 次提交
  9. 01 11月, 2011 2 次提交
  11. 01 8月, 2011 2 次提交
  13. 28 7月, 2011 2 次提交
    • J
      ocfs2: Avoid livelock in ocfs2_readpage() · c7e25e6e
      由 Jan Kara 提交于 
      When someone writes to an inode, readers accessing the same inode via
ocfs2_readpage() just busyloop trying to get ip_alloc_sem because
do_generic_file_read() looks up the page again and retries ->readpage()
when previous attempt failed with AOP_TRUNCATED_PAGE. When there are enough
readers, they can occupy all CPUs and in non-preempt kernel the system is
deadlocked because writer holding ip_alloc_sem is never run to release the
semaphore. Fix the problem by making reader block on ip_alloc_sem to break
the busy loop.
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NJoel Becker <jlbec@evilplan.org>
      c7e25e6e
    • M
      ocfs2: serialize unaligned aio · a11f7e63
      由 Mark Fasheh 提交于 
      Fix a corruption that can happen when we have (two or more) outstanding
aio's to an overlapping unaligned region.  Ext4
(e9e3bcec) and xfs recently had to fix
similar issues.

In our case what happens is that we can have an outstanding aio on a region
and if a write comes in with some bytes overlapping the original aio we may
decide to read that region into a page before continuing (typically because
of buffered-io fallback).  Since we have no ordering guarantees with the
aio, we can read stale or bad data into the page and then write it back out.

If the i/o is page and block aligned, then we avoid this issue as there
won't be any need to read data from disk.

I took the same approach as Eric in the ext4 patch and introduced some
serialization of unaligned async direct i/o.  I don't expect this to have an
effect on the most common cases of AIO.  Unaligned aio will be slower
though, but that's far more acceptable than data corruption.
Signed-off-by: NMark Fasheh <mfasheh@suse.com>
Signed-off-by: NJoel Becker <jlbec@evilplan.org>
      a11f7e63
  15. 26 7月, 2011 5 次提交
    • S
      ocfs2: Implement llseek() · 93862d5e
      由 Sunil Mushran 提交于 
      ocfs2 implements its own llseek() to provide the SEEK_HOLE/SEEK_DATA
functionality.

SEEK_HOLE sets the file pointer to the start of either a hole or an unwritten
(preallocated) extent, that is greater than or equal to the supplied offset.

SEEK_DATA sets the file pointer to the start of an allocated extent (not
unwritten) that is greater than or equal to the supplied offset.

If the supplied offset is on a desired region, then the file pointer is set
to it. Offsets greater than or equal to the file size return -ENXIO.

Unwritten (preallocated) extents are considered holes because the file system
treats reads to such regions in the same way as it does to holes.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
      93862d5e
    • C
      fs: take the ACL checks to common code · 4e34e719
      由 Christoph Hellwig 提交于 
      Replace the ->check_acl method with a ->get_acl method that simply reads an
ACL from disk after having a cache miss.  This means we can replace the ACL
checking boilerplate code with a single implementation in namei.c.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      4e34e719
    • A
      kill boilerplates around posix_acl_create_masq() · 826cae2f
      由 Al Viro 提交于 
      new helper: posix_acl_create(&acl, gfp, mode_p).  Replaces acl with
modified clone, on failure releases acl and replaces with NULL.
Returns 0 or -ve on error.  All callers of posix_acl_create_masq()
switched.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      826cae2f
    • A
      kill boilerplate around posix_acl_chmod_masq() · bc26ab5f
      由 Al Viro 提交于 
      new helper: posix_acl_chmod(&acl, gfp, mode).  Replaces acl with modified
clone or with NULL if that has failed; returns 0 or -ve on error.  All
callers of posix_acl_chmod_masq() switched to that - they'd been doing
exactly the same thing.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      bc26ab5f
    • L
      vfs: move ACL cache lookup into generic code · e77819e5
      由 Linus Torvalds 提交于 
      This moves logic for checking the cached ACL values from low-level
filesystems into generic code.  The end result is a streamlined ACL
check that doesn't need to load the inode->i_op->check_acl pointer at
all for the common cached case.

The filesystems also don't need to check for a non-blocking RCU walk
case in their acl_check() functions, because that is all handled at a
VFS layer.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      e77819e5
  17. 25 7月, 2011 14 次提交