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Darrick J. Wong db9ee22036 jbd2: fix descriptor block size handling errors with journal_csum ... It turns out that there are some serious problems with the on-disk format of journal checksum v2. The foremost is that the function to calculate descriptor tag size returns sizes that are too big. This causes alignment issues on some architectures and is compounded by the fact that some parts of jbd2 use the structure size (incorrectly) to determine the presence of a 64bit journal instead of checking the feature flags. Therefore, introduce journal checksum v3, which enlarges the descriptor block tag format to allow for full 32-bit checksums of journal blocks, fix the journal tag function to return the correct sizes, and fix the jbd2 recovery code to use feature flags to determine 64bitness. Add a few function helpers so we don't have to open-code quite so many pieces. Switching to a 16-byte block size was found to increase journal size overhead by a maximum of 0.1%, to convert a 32-bit journal with no checksumming to a 32-bit journal with checksum v3 enabled. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reported-by: TR Reardon <thomas_reardon@hotmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org		10 years ago
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Kconfig	…
Makefile	…
checkpoint.c	…
commit.c	jbd2: fix descriptor block size handling errors with journal_csum	10 years ago
journal.c	jbd2: fix descriptor block size handling errors with journal_csum	10 years ago
recovery.c	jbd2: fix descriptor block size handling errors with journal_csum	10 years ago
revoke.c	jbd2: fix descriptor block size handling errors with journal_csum	10 years ago
transaction.c	sched: Remove proliferation of wait_on_bit() action functions	11 years ago