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  1. 14 Jul, 2008 1 commit
    • Mingming Cao's avatar
      jbd2: fix race between jbd2_journal_try_to_free_buffers() and jbd2 commit transaction · 530576bb
      Mingming Cao authored 
      journal_try_to_free_buffers() could race with jbd commit transaction
when the later is holding the buffer reference while waiting for the
data buffer to flush to disk. If the caller of
journal_try_to_free_buffers() request tries hard to release the buffers,
it will treat the failure as error and return back to the caller. We
have seen the directo IO failed due to this race.  Some of the caller of
releasepage() also expecting the buffer to be dropped when passed with
GFP_KERNEL mask to the releasepage()->journal_try_to_free_buffers().

With this patch, if the caller is passing the GFP_KERNEL to indicating
this call could wait, in case of try_to_free_buffers() failed, let's
waiting for journal_commit_transaction() to finish commit the current
committing transaction , then try to free those buffers again with
journal locked.
Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
Reviewed-by: Badari Pulavarty <pbadari@us.ibm.com> 
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      530576bb
  3. 11 Jul, 2008 2 commits
    • Jose R. Santos's avatar
      ext4: New inode allocation for FLEX_BG meta-data groups. · 772cb7c8
      Jose R. Santos authored 
      This patch mostly controls the way inode are allocated in order to
make ialloc aware of flex_bg block group grouping.  It achieves this
by bypassing the Orlov allocator when block group meta-data are packed
toghether through mke2fs.  Since the impact on the block allocator is
minimal, this patch should have little or no effect on other block
allocation algorithms. By controlling the inode allocation, it can
basically control where the initial search for new block begins and
thus indirectly manipulate the block allocator.

This allocator favors data and meta-data locality so the disk will
gradually be filled from block group zero upward.  This helps improve
performance by reducing seek time.  Since the group of inode tables
within one flex_bg are treated as one giant inode table, uninitialized
block groups would not need to partially initialize as many inode
table as with Orlov which would help fsck time as the filesystem usage
goes up.
Signed-off-by: default avatarJose R. Santos <jrs@us.ibm.com>
Signed-off-by: default avatarValerie Clement <valerie.clement@bull.net>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      772cb7c8
    • Theodore Ts'o's avatar
      jbd2: Add commit time into the commit block · 736603ab
      Theodore Ts'o authored 
      Carlo Wood has demonstrated that it's possible to recover deleted
files from the journal.  Something that will make this easier is if we
can put the time of the commit into commit block.
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      736603ab
  5. 14 Jul, 2008 3 commits
  7. 11 Jul, 2008 16 commits
  9. 13 Jul, 2008 6 commits
  11. 12 Jul, 2008 12 commits
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