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| author | Darrick J. Wong <djwong@us.ibm.com> | 2012-05-27 07:50:56 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-05-27 07:50:56 -0400 |
| commit | 01b5adcebb977bc61b64167adce6d8260c9da33c (patch) | |
| tree | 2d17de43723163d40ada0d8f51faf1061c324f5f /include/linux/jbd2.h | |
| parent | 25ed6e8a54df904c875365eebedbd19138a47328 (diff) | |
| download | linux-01b5adcebb977bc61b64167adce6d8260c9da33c.tar.gz linux-01b5adcebb977bc61b64167adce6d8260c9da33c.tar.bz2 linux-01b5adcebb977bc61b64167adce6d8260c9da33c.zip | |
jbd2: Grab a reference to the crc32c driver if necessary
Obtain a reference to the crc32c driver if needed for the v2 checksum.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include/linux/jbd2.h')
| -rw-r--r-- | include/linux/jbd2.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index 809c439066c5..71e77dddebf1 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -31,6 +31,7 @@ #include <linux/mutex.h> #include <linux/timer.h> #include <linux/slab.h> +#include <crypto/hash.h> #endif #define journal_oom_retry 1 @@ -965,6 +966,9 @@ struct journal_s * superblock pointer here */ void *j_private; + + /* Reference to checksum algorithm driver via cryptoapi */ + struct crypto_shash *j_chksum_driver; }; /* @@ -1294,6 +1298,25 @@ static inline int jbd_space_needed(journal_t *journal) extern int jbd_blocks_per_page(struct inode *inode); +static inline u32 jbd2_chksum(journal_t *journal, u32 crc, + const void *address, unsigned int length) +{ + struct { + struct shash_desc shash; + char ctx[crypto_shash_descsize(journal->j_chksum_driver)]; + } desc; + int err; + + desc.shash.tfm = journal->j_chksum_driver; + desc.shash.flags = 0; + *(u32 *)desc.ctx = crc; + + err = crypto_shash_update(&desc.shash, address, length); + BUG_ON(err); + + return *(u32 *)desc.ctx; +} + #ifdef __KERNEL__ #define buffer_trace_init(bh) do {} while (0) |