linux-stable.git/fs/jbd2, branch v3.5.7

jbd2: don't write superblock when if its empty

2012-10-12T20:46:57+00:00

commit eeecef0af5ea4efd763c9554cf2bd80fc4a0efd3 upstream.

This sequence:

# truncate --size=1g fsfile
# mkfs.ext4 -F fsfile
# mount -o loop,ro fsfile /mnt
# umount /mnt
# dmesg | tail

results in an IO error when unmounting the RO filesystem:

[  318.020828] Buffer I/O error on device loop1, logical block 196608
[  318.027024] lost page write due to I/O error on loop1
[  318.032088] JBD2: Error -5 detected when updating journal superblock for loop1-8.

This was a regression introduced by commit 24bcc89c7e7c: "jbd2: split
updating of journal superblock and marking journal empty".

Signed-off-by: Eric Sandeen 
Signed-off-by: "Theodore Ts'o" 
Signed-off-by: Greg Kroah-Hartman

ext4: make sure the journal sb is written in ext4_clear_journal_err()

2012-08-26T02:31:42+00:00

commit d796c52ef0b71a988364f6109aeb63d79c5b116b upstream.

After we transfer set the EXT4_ERROR_FS bit in the file system
superblock, it's not enough to call jbd2_journal_clear_err() to clear
the error indication from journal superblock --- we need to call
jbd2_journal_update_sb_errno() as well.  Otherwise, when the root file
system is mounted read-only, the journal is replayed, and the error
indicator is transferred to the superblock --- but the s_errno field
in the jbd2 superblock is left set (since although we cleared it in
memory, we never flushed it out to disk).

This can end up confusing e2fsck.  We should make e2fsck more robust
in this case, but the kernel shouldn't be leaving things in this
confused state, either.

Signed-off-by: "Theodore Ts'o" 
Signed-off-by: Greg Kroah-Hartman

jbd2: use kmem_cache_zalloc wrapper instead of flag

2012-06-01T04:10:32+00:00

Use kmem_cache_zalloc wrapper instead of flag __GFP_ZERO.

Signed-off-by: Wanlong Gao 
Signed-off-by: "Theodore Ts'o"

jbd2: checksum data blocks that are stored in the journal

2012-05-27T12:12:12+00:00

Calculate and verify checksums of each data block being stored in the journal.

Signed-off-by: Darrick J. Wong 
Signed-off-by: "Theodore Ts'o"

jbd2: checksum commit blocks

2012-05-27T12:10:25+00:00

Calculate and verify the checksum of commit blocks.  In checksum v2,
deprecate most of the checksum v1 commit block checksum fields, since
each block has its own checksum.

Signed-off-by: Darrick J. Wong 
Signed-off-by: "Theodore Ts'o"

jbd2: checksum descriptor blocks

2012-05-27T12:10:22+00:00

Calculate and verify a checksum of each descriptor block.

Signed-off-by: Darrick J. Wong 
Signed-off-by: "Theodore Ts'o"

jbd2: checksum revocation blocks

2012-05-27T12:08:24+00:00

Compute and verify revoke blocks inside the journal.

Signed-off-by: Darrick J. Wong 
Signed-off-by: "Theodore Ts'o"

jbd2: checksum journal superblock

2012-05-27T12:08:22+00:00

Calculate and verify a checksum covering the journal superblock.

Signed-off-by: Darrick J. Wong 
Signed-off-by: "Theodore Ts'o"

jbd2: Grab a reference to the crc32c driver if necessary

2012-05-27T11:50:56+00:00

Obtain a reference to the crc32c driver if needed for the v2 checksum.

Signed-off-by: Darrick J. Wong 
Signed-off-by: "Theodore Ts'o"

jbd2: enable journal clients to enable v2 checksumming

2012-05-27T11:48:56+00:00

Add in the necessary code so that journal clients can enable the new
journal checksumming features.

Signed-off-by: Darrick J. Wong 
Signed-off-by: "Theodore Ts'o"