A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 19:21:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

jbd2: Grab a reference to the crc32c driver if necessary

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

Signed-off-by: Darrick J. Wong <[email protected]>
Signed-off-by: "Theodore Ts'o" <[email protected]>
This commit is contained in:
Darrick J. Wong 2012-05-27 07:50:56 -04:00 • committed by Theodore Ts'o
commit 01b5adcebb
3 changed files with 50 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/jbd2/Kconfig
View file

@ -1,6 +1,8 @@
config JBD2
tristate
select CRC32
select CRYPTO
select CRYPTO_CRC32C
help
This is a generic journaling layer for block devices that support
both 32-bit and 64-bit block numbers. It is currently used by

25
fs/jbd2/journal.c
View file

@ -1438,6 +1438,17 @@ static int journal_get_superblock(journal_t *journal)
goto out;
}
/* Load the checksum driver */
if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) {
journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
if (IS_ERR(journal->j_chksum_driver)) {
printk(KERN_ERR "JBD: Cannot load crc32c driver.\n");
err = PTR_ERR(journal->j_chksum_driver);
journal->j_chksum_driver = NULL;
goto out;
}
}
set_buffer_verified(bh);
return 0;
@ -1591,6 +1602,8 @@ int jbd2_journal_destroy(journal_t *journal)
iput(journal->j_inode);
if (journal->j_revoke)
jbd2_journal_destroy_revoke(journal);
if (journal->j_chksum_driver)
crypto_free_shash(journal->j_chksum_driver);
kfree(journal->j_wbuf);
kfree(journal);
@ -1707,6 +1720,18 @@ int jbd2_journal_set_features (journal_t *journal, unsigned long compat,
sb->s_checksum_type = JBD2_CRC32C_CHKSUM;
sb->s_feature_compat &=
~cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM);
/* Load the checksum driver */
if (journal->j_chksum_driver == NULL) {
journal->j_chksum_driver = crypto_alloc_shash("crc32c",
0, 0);
if (IS_ERR(journal->j_chksum_driver)) {
printk(KERN_ERR "JBD: Cannot load crc32c "
"driver.\n");
journal->j_chksum_driver = NULL;
return 0;
}
}
}
/* If enabling v1 checksums, downgrade superblock */