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  1. 25 2月, 2011 5 次提交
    • C
      ext4: mballoc: don't replace the current preallocation group unnecessarily · 5a54b2f1
      由 Coly Li 提交于 
      In ext4_mb_check_group_pa(), the current preallocation space is
replaced with a new preallocation space when the two have the same
distance from the goal block.

This doesn't actually gain us anything, so change things so that the
function only switches to the new preallocation group if its distance
from the goal block is strictly smaller than the current preallocaiton
group's distance from the goal block.
Signed-off-by: NColy Li <bosong.ly@taobao.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      5a54b2f1
    • 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 3 次提交