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  1. 25 2月, 2011 4 次提交
    • C
      ext4: clarify description of ac_g_ex in struct ext4_allocation_context · 58696f3a
      由 Coly Li 提交于 
      Signed-off-by: NColy Li <bosong.ly@taobao.com>
Cc: Alex Tomas <alex@clusterfs.com>
Cc: Theodore Tso <tytso@google.com>
      58696f3a
    • C
      mballoc: add comments to ext4_mb_mark_free_simple() · 7c786059
      由 Coly Li 提交于 
      This patch adds comments to ext4_mb_mark_free_simple to make it more
understandable.
Signed-off-by: NColy Li <bosong.ly@taobao.com>
Cc: Alex Tomas <alex@clusterfs.com>
Cc: Theodore Tso <tytso@google.com>
      7c786059
    • C
      ext4: remove unncessary call mb_find_buddy() in debugging code · 235772da
      由 Coly Li 提交于 
      In __mb_check_buddy(), look at the code below:
  591         fstart = -1;
  592         buddy = mb_find_buddy(e4b, 0, &max);
  593         for (i = 0; i < max; i++) {
  594                 if (!mb_test_bit(i, buddy)) {
  595                         MB_CHECK_ASSERT(i >= e4b->bd_info->bb_first_free);
  596                         if (fstart == -1) {
  597                                 fragments++;
  598                                 fstart = i;
  599                         }
  600                         continue;
  601                 }
  602                 fstart = -1;
  603                 /* check used bits only */
  604                 for (j = 0; j < e4b->bd_blkbits + 1; j++) {
  605                         buddy2 = mb_find_buddy(e4b, j, &max2);
  606                         k = i >> j;
  607                         MB_CHECK_ASSERT(k < max2);
  608                         MB_CHECK_ASSERT(mb_test_bit(k, buddy2));
  609                 }
  610         }
  611         MB_CHECK_ASSERT(!EXT4_MB_GRP_NEED_INIT(e4b->bd_info));
  612         MB_CHECK_ASSERT(e4b->bd_info->bb_fragments == fragments);
  613
  614         grp = ext4_get_group_info(sb, e4b->bd_group);
  615         buddy = mb_find_buddy(e4b, 0, &max);

On line 592, buddy is fetched by mb_find_buddy() with order 0, between
line 593 to line 615, buddy is not changed, therefore there is
no need to fetch buddy again from mb_find_buddy() with order 0 again.

We can safely remove the second mb_find_buddy() on line 615.
Signed-off-by: NColy Li <bosong.ly@taobao.com>
Cc: Alex Tomas <alex@clusterfs.com>
Cc: Theodore Tso <tytso@google.com>
      235772da
    • C
      ext4: code cleanup in mb_find_buddy() · 84b775a3
      由 Coly Li 提交于 
      Current code calculate max no matter whether order is zero, it's
unnecessary. This cleanup patch sets max to "1 << (e4b->bd_blkbits
+ 3)" only when order == 0.
Signed-off-by: NColy Li <bosong.ly@taobao.com>
Cc: Alex Tomas <alex@clusterfs.com>
Cc: Theodore Tso <tytso@google.com>
      84b775a3
  3. 24 2月, 2011 4 次提交
  5. 22 2月, 2011 4 次提交
  7. 17 2月, 2011 1 次提交
    • L
      vfs: fix BUG_ON() in fs/namei.c:1461 · 3abb17e8
      由 Linus Torvalds 提交于 
      When Al moved the nameidata_dentry_drop_rcu_maybe() call into the
do_follow_link function in commit 844a3917 ("nothing in
do_follow_link() is going to see RCU"), he mistakenly left the

	BUG_ON(inode != path->dentry->d_inode);

behind.  Which would otherwise be ok, but that BUG_ON() really needs to
be _after_ dropping RCU, since the dentry isn't necessarily stable
otherwise.

So complete the code movement in that commit, and move the BUG_ON() into
do_follow_link() too.  This means that we need to pass in 'inode' as an
argument (just for this one use), but that's a small thing.  And
eventually we may be confident enough in our path lookup that we can
just remove the BUG_ON() and the unnecessary inode argument.
Reported-and-tested-by: NEric Dumazet <eric.dumazet@gmail.com>
Acked-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      3abb17e8
  9. 16 2月, 2011 23 次提交
  11. 15 2月, 2011 4 次提交