ext4: make sure directory and symlink blocks are revoked

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When an inode gets unlinked, the functions ext4_clear_blocks() and
ext4_remove_blocks() call ext4_forget() for all the buffer heads
corresponding to the deleted inode's data blocks.  If the inode is a
directory or a symlink, the is_metadata parameter must be non-zero so
ext4_forget() will revoke them via jbd2_journal_revoke().  Otherwise,
if these blocks are reused for a data file, and the system crashes
before a journal checkpoint, the journal replay could end up
corrupting these data blocks.

Thanks to Curt Wohlgemuth for pointing out potential problems in this
area.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org

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This commit is contained in:

Theodore Ts'o 2009-11-23 07:17:34 -05:00

parent beac2da756

commit 5068969686

2 changed files with 5 additions and 3 deletions

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2

fs/ext4/extents.c

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6

fs/ext4/inode.c

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