ext4: wait for log to commit when umounting

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(cherry picked from commit d4edac314e)

There is a potential race when a transaction is committing right when
the file system is being umounting.  This could reduce in a race
because EXT4_SB(sb)->s_group_info could be freed in ext4_put_super
before the commit code calls a callback so the mballoc code can
release freed blocks in the transaction, resulting in a panic trying
to access the freed s_group_info.

The fix is to wait for the transaction to finish committing before we
shutdown the multiblock allocator.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

...

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Josef Bacik 2009-12-08 21:48:58 -05:00 • committed by Greg Kroah-Hartman

parent 35a6f78249

commit 1cd3f1980c

1 changed files with 6 additions and 4 deletions

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fs/ext4/super.c

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