git.karo-electronics.de Git - karo-tx-linux.git/log

ext4: add metadata checksumming to the list of supported features

Activate the metadata checksumming feature by adding it to ext4 and jbd2's
lists of supported features.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Darrick J. Wong [Sun, 29 Apr 2012 22:47:10 +0000 (18:47 -0400)]

ext4: add checksums to the MMP block

Compute and verify a checksum for the MMP block.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Darrick J. Wong [Sun, 29 Apr 2012 22:45:10 +0000 (18:45 -0400)]

ext4: make block group checksums use metadata_csum algorithm

metadata_csum supersedes uninit_bg. Convert the ROCOMPAT uninit_bg
flag check to a helper function that covers both, and make the
checksum calculation algorithm use either crc16 or the metadata_csum
chosen algorithm depending on which flag is set. Print a warning if
we try to mount a filesystem with both feature flags set.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Darrick J. Wong [Sun, 29 Apr 2012 22:43:10 +0000 (18:43 -0400)]

ext4: Calculate and verify checksums of extended attribute blocks

Calculate and verify the checksums of extended attribute blocks. This
only applies to separate EA blocks that are pointed to by
inode->i_file_acl (i.e. external EA blocks); the checksum lives in
the EA header.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:41:10 +0000 (18:41 -0400)]

ext4: calculate and verify checksums of directory leaf blocks

Calculate and verify the checksums for directory leaf blocks
(i.e. blocks that only contain actual directory entries). The
checksum lives in what looks to be an unused directory entry with a 0
name_len at the end of the block. This scheme is not used for
internal htree nodes because the mechanism in place there only costs
one dx_entry, whereas the "empty" directory entry would cost two
dx_entries.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Darrick J. Wong [Sun, 29 Apr 2012 22:39:10 +0000 (18:39 -0400)]

ext4: Calculate and verify checksums for htree nodes

Calculate and verify the checksum for directory index tree (htree)
node blocks. The checksum is stored in the last 4 bytes of the htree
block and requires the dx_entry array to stop 1 dx_entry short of the
end of the block.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:37:10 +0000 (18:37 -0400)]

ext4: verify and calculate checksums for extent tree  blocks

Calculate and verify the checksum for each extent tree block.  The
checksum is located in the space immediately after the last possible
ext4_extent in the block.  The space is is typically the last 4-8
bytes in the block.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:35:10 +0000 (18:35 -0400)]

ext4: calculate and verify block bitmap checksum

Compute and verify the checksum of the block bitmap; this checksum is
stored in the block group descriptor.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:33:10 +0000 (18:33 -0400)]

ext4: calculate and verify checksums for inode bitmaps

Compute and verify the checksum of the inode bitmap; the checkum is
stored in the block group descriptor.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:31:10 +0000 (18:31 -0400)]

ext4: calculate and verify inode checksums

This patch introduces to ext4 the ability to calculate and verify
inode checksums. This requires the use of a new ro compatibility flag
and some accompanying e2fsprogs patches to provide the relevant
features in tune2fs and e2fsck. The inode generation changes have
been integrated into this patch.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:29:10 +0000 (18:29 -0400)]

ext4: calculate and verify superblock checksum

Calculate and verify the superblock checksum. Since the UUID and
block group number are embedded in each copy of the superblock, we
need only checksum the entire block. Refactor some of the code to
eliminate open-coding of the checksum update call.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:27:10 +0000 (18:27 -0400)]

ext4: load the crc32c driver if necessary

Obtain a reference to the cryptoapi and crc32c if we mount a
filesystem with metadata checksumming enabled.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

commit | commitdiff | tree

Darrick J. Wong [Sun, 29 Apr 2012 22:25:10 +0000 (18:25 -0400)]

ext4: record the checksum algorithm in use in the superblock

Record the type of checksum algorithm we're using for metadata in the
superblock, in case we ever want/need to change the algorithm.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

Linux kernel for KaRo TX COM modules

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