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jbd: correctly unescape journal data blocks
Fix a long-standing typo (predating git) that will cause data corruption if a journal data block needs unescaping. At the moment the wrong buffer head's data is being unescaped. To test this case mount a filesystem with data=journal, start creating and deleting a bunch of files containing only JFS_MAGIC_NUMBER (0xc03b3998), then pull the plug on the device. Without this patch the files will contain zeros instead of the correct data after recovery. Signed-off-by: Duane Griffin <duaneg@dghda.com> Acked-by: Jan Kara <jack@suse.cz> Cc: <linux-ext4@vger.kernel.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -478,7 +478,7 @@ static int do_one_pass(journal_t *journal,
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memcpy(nbh->b_data, obh->b_data,
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journal->j_blocksize);
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if (flags & JFS_FLAG_ESCAPE) {
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*((__be32 *)bh->b_data) =
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*((__be32 *)nbh->b_data) =
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cpu_to_be32(JFS_MAGIC_NUMBER);
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}
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