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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>
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@ -2,6 +2,8 @@ config EXT4_FS
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tristate "The Extended 4 (ext4) filesystem"
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select JBD2
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select CRC16
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select CRYPTO
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select CRYPTO_CRC32C
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help
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This is the next generation of the ext3 filesystem.
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@ -29,6 +29,7 @@
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#include <linux/wait.h>
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#include <linux/blockgroup_lock.h>
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#include <linux/percpu_counter.h>
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#include <crypto/hash.h>
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#ifdef __KERNEL__
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#include <linux/compat.h>
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#endif
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@ -1276,6 +1277,9 @@ struct ext4_sb_info {
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/* record the last minlen when FITRIM is called. */
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atomic_t s_last_trim_minblks;
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/* Reference to checksum algorithm driver via cryptoapi */
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struct crypto_shash *s_chksum_driver;
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};
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static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
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@ -1639,6 +1643,25 @@ static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
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#define DX_HASH_HALF_MD4_UNSIGNED 4
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#define DX_HASH_TEA_UNSIGNED 5
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static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
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const void *address, unsigned int length)
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{
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struct {
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struct shash_desc shash;
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char ctx[crypto_shash_descsize(sbi->s_chksum_driver)];
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} desc;
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int err;
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desc.shash.tfm = sbi->s_chksum_driver;
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desc.shash.flags = 0;
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*(u32 *)desc.ctx = crc;
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err = crypto_shash_update(&desc.shash, address, length);
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BUG_ON(err);
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return *(u32 *)desc.ctx;
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}
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#ifdef __KERNEL__
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/* hash info structure used by the directory hash */
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@ -915,6 +915,8 @@ static void ext4_put_super(struct super_block *sb)
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unlock_super(sb);
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kobject_put(&sbi->s_kobj);
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wait_for_completion(&sbi->s_kobj_unregister);
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if (sbi->s_chksum_driver)
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crypto_free_shash(sbi->s_chksum_driver);
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kfree(sbi->s_blockgroup_lock);
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kfree(sbi);
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}
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@ -3043,6 +3045,18 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
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goto cantfind_ext4;
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}
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/* Load the checksum driver */
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if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
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EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
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sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
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if (IS_ERR(sbi->s_chksum_driver)) {
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ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
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ret = PTR_ERR(sbi->s_chksum_driver);
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sbi->s_chksum_driver = NULL;
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goto failed_mount;
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}
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}
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/* Set defaults before we parse the mount options */
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def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
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set_opt(sb, INIT_INODE_TABLE);
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@ -3728,6 +3742,8 @@ failed_mount2:
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brelse(sbi->s_group_desc[i]);
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ext4_kvfree(sbi->s_group_desc);
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failed_mount:
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if (sbi->s_chksum_driver)
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crypto_free_shash(sbi->s_chksum_driver);
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if (sbi->s_proc) {
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remove_proc_entry("options", sbi->s_proc);
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remove_proc_entry(sb->s_id, ext4_proc_root);
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