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This fixes the root cause of the ext4 data corruption bug which raised

Browse source 
a ruckus on LWN, Phoronix, and Slashdot.  This bug only showed up when
 non-standard mount options (journal_async_commit and/or
 journal_checksum) were enabled, and when the file system was not
 cleanly unmounted, but the root cause was the inode bitmap
 modifications was not being properly journaled.  This could
 potentially lead to minor file system corruptions (pass 5 complaints
 with the inode allocation bitmap) after an unclean shutdown under the
 wrong/unlucky workloads, but it turned into major failure if the
 journal_checksum and/or jouaral_async_commit  was enabled.
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Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 bugfix from Ted Ts'o:
 "This fixes the root cause of the ext4 data corruption bug which raised
  a ruckus on LWN, Phoronix, and Slashdot.

  This bug only showed up when non-standard mount options
  (journal_async_commit and/or journal_checksum) were enabled, and when
  the file system was not cleanly unmounted, but the root cause was the
  inode bitmap modifications was not being properly journaled.

  This could potentially lead to minor file system corruptions (pass 5
  complaints with the inode allocation bitmap) after an unclean shutdown
  under the wrong/unlucky workloads, but it turned into major failure if
  the journal_checksum and/or jouaral_async_commit was enabled."

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix unjournaled inode bitmap modification
This commit is contained in:
Linus Torvalds 2012-10-30 15:35:16 -07:00
parent 4476c0eead ffb5387e85
commit 8c673cbc76
1 changed files with 9 additions and 10 deletions
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19
fs/ext4/ialloc.c
View file

@ -725,6 +725,10 @@ repeat_in_this_group:
"inode=%lu", ino + 1);
continue;
}
BUFFER_TRACE(inode_bitmap_bh, "get_write_access");
err = ext4_journal_get_write_access(handle, inode_bitmap_bh);
if (err)
goto fail;
ext4_lock_group(sb, group);
ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data);
ext4_unlock_group(sb, group);
@ -738,6 +742,11 @@ repeat_in_this_group:
goto out;
got:
BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh);
if (err)
goto fail;
/* We may have to initialize the block bitmap if it isn't already */
if (ext4_has_group_desc_csum(sb) &&
gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
@ -771,11 +780,6 @@ got:
goto fail;
}
BUFFER_TRACE(inode_bitmap_bh, "get_write_access");
err = ext4_journal_get_write_access(handle, inode_bitmap_bh);
if (err)
goto fail;
BUFFER_TRACE(group_desc_bh, "get_write_access");
err = ext4_journal_get_write_access(handle, group_desc_bh);
if (err)
@ -823,11 +827,6 @@ got:
}
ext4_unlock_group(sb, group);
BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh);
if (err)
goto fail;
BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata");
err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh);
if (err)