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  1. 04 8月, 2010 1 次提交
  3. 27 7月, 2010 1 次提交
    • T
      jbd2: Remove __GFP_NOFAIL from jbd2 layer · 47def826
      由 Theodore Ts'o 提交于 
      __GFP_NOFAIL is going away, so add our own retry loop.  Also add
jbd2__journal_start() and jbd2__journal_restart() which take a gfp
mask, so that file systems can optionally (re)start transaction
handles using GFP_KERNEL.  If they do this, then they need to be
prepared to handle receiving an PTR_ERR(-ENOMEM) error, and be ready
to reflect that error up to userspace.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      47def826
  5. 16 7月, 2010 1 次提交
    • J
      jbd2/ocfs2: Fix block checksumming when a buffer is used in several transactions · 13ceef09
      由 Jan Kara 提交于 
      OCFS2 uses t_commit trigger to compute and store checksum of the just
committed blocks. When a buffer has b_frozen_data, checksum is computed
for it instead of b_data but this can result in an old checksum being
written to the filesystem in the following scenario:

1) transaction1 is opened
2) handle1 is opened
3) journal_access(handle1, bh)
    - This sets jh->b_transaction to transaction1
4) modify(bh)
5) journal_dirty(handle1, bh)
6) handle1 is closed
7) start committing transaction1, opening transaction2
8) handle2 is opened
9) journal_access(handle2, bh)
    - This copies off b_frozen_data to make it safe for transaction1 to commit.
      jh->b_next_transaction is set to transaction2.
10) jbd2_journal_write_metadata() checksums b_frozen_data
11) the journal correctly writes b_frozen_data to the disk journal
12) handle2 is closed
    - There was no dirty call for the bh on handle2, so it is never queued for
      any more journal operation
13) Checkpointing finally happens, and it just spools the bh via normal buffer
writeback.  This will write b_data, which was never triggered on and thus
contains a wrong (old) checksum.

This patch fixes the problem by calling the trigger at the moment data is
frozen for journal commit - i.e., either when b_frozen_data is created by
do_get_write_access or just before we write a buffer to the log if
b_frozen_data does not exist. We also rename the trigger to t_frozen as
that better describes when it is called.
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NMark Fasheh <mfasheh@suse.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>
      13ceef09
  7. 15 6月, 2010 1 次提交
  9. 11 5月, 2010 1 次提交
  11. 23 12月, 2009 2 次提交
  13. 10 12月, 2009 1 次提交
  15. 07 12月, 2009 1 次提交
    • T
      ext4: Use slab allocator for sub-page sized allocations · d2eecb03
      由 Theodore Ts'o 提交于 
      Now that the SLUB seems to be fixed so that it respects the requested
alignment, use kmem_cache_alloc() to allocator if the block size of
the buffer heads to be allocated is less than the page size.
Previously, we were using 16k page on a Power system for each buffer,
even when the file system was using 1k or 4k block size.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      d2eecb03
  17. 01 12月, 2009 1 次提交
  19. 16 11月, 2009 1 次提交
    • T
      jbd2: don't wipe the journal on a failed journal checksum · e6a47428
      由 Theodore Ts'o 提交于 
      If there is a failed journal checksum, don't reset the journal.  This
allows for userspace programs to decide how to recover from this
situation.  It may be that ignoring the journal checksum failure might
be a better way of recovering the file system.  Once we add per-block
checksums, we can definitely do better.  Until then, a system
administrator can try backing up the file system image (or taking a
snapshot) and and trying to determine experimentally whether ignoring
the checksum failure or aborting the journal replay results in less
data loss.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
      e6a47428
  21. 11 11月, 2009 1 次提交
  23. 02 10月, 2009 1 次提交
  25. 30 9月, 2009 2 次提交
  27. 23 9月, 2009 1 次提交
  29. 14 7月, 2009 1 次提交
    • D
      jbd2: fix race between write_metadata_buffer and get_write_access · 96577c43
      由 dingdinghua 提交于 
      The function jbd2_journal_write_metadata_buffer() calls
jbd_unlock_bh_state(bh_in) too early; this could potentially allow
another thread to call get_write_access on the buffer head, modify the
data, and dirty it, and allowing the wrong data to be written into the
journal.  Fortunately, if we lose this race, the only time this will
actually cause filesystem corruption is if there is a system crash or
other unclean shutdown of the system before the next commit can take
place.
Signed-off-by: Ndingdinghua <dingdinghua85@gmail.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      96577c43
  31. 17 7月, 2009 1 次提交
  33. 21 6月, 2009 1 次提交
  35. 09 6月, 2009 1 次提交
  37. 17 6月, 2009 1 次提交
  39. 11 2月, 2009 1 次提交
    • J
      jbd2: Fix return value of jbd2_journal_start_commit() · c88ccea3
      由 Jan Kara 提交于 
      The function jbd2_journal_start_commit() returns 1 if either a
transaction is committing or the function has queued a transaction
commit. But it returns 0 if we raced with somebody queueing the
transaction commit as well. This resulted in ext4_sync_fs() not
functioning correctly (description from Arthur Jones): 

   In the case of a data=ordered umount with pending long symlinks
   which are delayed due to a long list of other I/O on the backing
   block device, this causes the buffer associated with the long
   symlinks to not be moved to the inode dirty list in the second
   phase of fsync_super.  Then, before they can be dirtied again,
   kjournald exits, seeing the UMOUNT flag and the dirty pages are
   never written to the backing block device, causing long symlink
   corruption and exposing new or previously freed block data to
   userspace.

This can be reproduced with a script created by Eric Sandeen
<sandeen@redhat.com>:

        #!/bin/bash

        umount /mnt/test2
        mount /dev/sdb4 /mnt/test2
        rm -f /mnt/test2/*
        dd if=/dev/zero of=/mnt/test2/bigfile bs=1M count=512
        touch /mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
        ln -s /mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
        /mnt/test2/link
        umount /mnt/test2
        mount /dev/sdb4 /mnt/test2
        ls /mnt/test2/

This patch fixes jbd2_journal_start_commit() to always return 1 when
there's a transaction committing or queued for commit.
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
CC: Eric Sandeen <sandeen@redhat.com>
CC: linux-ext4@vger.kernel.org
      c88ccea3
  41. 12 1月, 2009 1 次提交
    • S
      ext4: fix wrong use of do_div · c225aa57
      由 Simon Holm Thøgersen 提交于 
      the following warning:

fs/jbd2/journal.c: In function ‘jbd2_seq_info_show’:
fs/jbd2/journal.c:850: warning: format ‘%lu’ expects type ‘long
unsigned int’, but argument 3 has type ‘uint32_t’

is caused by wrong usage of do_div that modifies the dividend in-place
and returns the quotient. So not only would an incorrect value be
displayed, but s->journal->j_average_commit_time would also be changed
to a wrong value!

Fix it by using div_u64 instead.
Signed-off-by: NSimon Holm Thøgersen <odie@cs.aau.dk>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      c225aa57
  43. 07 1月, 2009 1 次提交
  45. 06 1月, 2009 1 次提交
    • J
      jbd2: Add buffer triggers · e06c8227
      由 Joel Becker 提交于 
      Filesystems often to do compute intensive operation on some
metadata.  If this operation is repeated many times, it can be very
expensive.  It would be much nicer if the operation could be performed
once before a buffer goes to disk.

This adds triggers to jbd2 buffer heads.  Just before writing a metadata
buffer to the journal, jbd2 will optionally call a commit trigger associated
with the buffer.  If the journal is aborted, an abort trigger will be
called on any dirty buffers as they are dropped from pending
transactions.

ocfs2 will use this feature.

Initially I tried to come up with a more generic trigger that could be
used for non-buffer-related events like transaction completion.  It
doesn't tie nicely, because the information a buffer trigger needs
(specific to a journal_head) isn't the same as what a transaction
trigger needs (specific to a tranaction_t or perhaps journal_t).  So I
implemented a buffer set, with the understanding that
journal/transaction wide triggers should be implemented separately.

There is only one trigger set allowed per buffer.  I can't think of any
reason to attach more than one set.  Contrast this with a journal or
transaction in which multiple places may want to watch the entire
transaction separately.

The trigger sets are considered static allocation from the jbd2
perspective.  ocfs2 will just have one trigger set per block type,
setting the same set on every bh of the same type.
Signed-off-by: NJoel Becker <joel.becker@oracle.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: NMark Fasheh <mfasheh@suse.com>
      e06c8227
  47. 04 1月, 2009 1 次提交
  49. 07 1月, 2009 1 次提交
  51. 05 11月, 2008 1 次提交
  53. 04 1月, 2009 1 次提交
  55. 17 12月, 2008 1 次提交
  57. 03 11月, 2008 1 次提交
  59. 11 10月, 2008 1 次提交
    • H
      jbd2: fix error handling for checkpoint io · 44519faf
      由 Hidehiro Kawai 提交于 
      When a checkpointing IO fails, current JBD2 code doesn't check the
error and continue journaling.  This means latest metadata can be
lost from both the journal and filesystem.

This patch leaves the failed metadata blocks in the journal space
and aborts journaling in the case of jbd2_log_do_checkpoint().
To achieve this, we need to do:

1. don't remove the failed buffer from the checkpoint list where in
   the case of __try_to_free_cp_buf() because it may be released or
   overwritten by a later transaction
2. jbd2_log_do_checkpoint() is the last chance, remove the failed
   buffer from the checkpoint list and abort the journal
3. when checkpointing fails, don't update the journal super block to
   prevent the journaled contents from being cleaned.  For safety,
   don't update j_tail and j_tail_sequence either
4. when checkpointing fails, notify this error to the ext4 layer so
   that ext4 don't clear the needs_recovery flag, otherwise the
   journaled contents are ignored and cleaned in the recovery phase
5. if the recovery fails, keep the needs_recovery flag
6. prevent jbd2_cleanup_journal_tail() from being called between
   __jbd2_journal_drop_transaction() and jbd2_journal_abort()
   (a possible race issue between jbd2_log_do_checkpoint()s called by
   jbd2_journal_flush() and __jbd2_log_wait_for_space())
Signed-off-by: NHidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
      44519faf
  61. 07 10月, 2008 1 次提交
  63. 17 9月, 2008 1 次提交
    • T
      jbd2: clean up how the journal device name is printed · 05496769
      由 Theodore Ts'o 提交于 
      Calculate the journal device name once and stash it away in the
journal_s structure.  This avoids needing to call bdevname()
everywhere and reduces stack usage by not needing to allocate an
on-stack buffer.  In addition, we eliminate the '/' that can appear in
device names (e.g. "cciss/c0d0p9" --- see kernel bugzilla #11321) that
can cause problems when creating proc directory names, and include the
inode number to support ocfs2 which creates multiple journals with
different inode numbers.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      05496769
  65. 27 7月, 2008 1 次提交
  67. 12 7月, 2008 2 次提交
  69. 13 5月, 2008 1 次提交
  71. 29 4月, 2008 1 次提交
  73. 17 4月, 2008 1 次提交