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| author | Darrick J. Wong <djwong@us.ibm.com> | 2012-04-30 00:27:10 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-04-30 00:27:10 +0200 |
| commit | 0441984a3398970ab4820410b9cf4ff85bf3a6b0 (patch) | |
| tree | 23c22fad52554003b39d35e6dee7729df3e0797d /fs/ext4/super.c | |
| parent | ext4: record the checksum algorithm in use in the superblock (diff) | |
| download | linux-0441984a3398970ab4820410b9cf4ff85bf3a6b0.tar.xz linux-0441984a3398970ab4820410b9cf4ff85bf3a6b0.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | fs/ext4/super.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index f489ffb3605d..11a0a7078da7 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -915,6 +915,8 @@ static void ext4_put_super(struct super_block *sb) unlock_super(sb); kobject_put(&sbi->s_kobj); wait_for_completion(&sbi->s_kobj_unregister); + if (sbi->s_chksum_driver) + crypto_free_shash(sbi->s_chksum_driver); kfree(sbi->s_blockgroup_lock); kfree(sbi); } @@ -3043,6 +3045,18 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) goto cantfind_ext4; } + /* Load the checksum driver */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { + sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); + if (IS_ERR(sbi->s_chksum_driver)) { + ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); + ret = PTR_ERR(sbi->s_chksum_driver); + sbi->s_chksum_driver = NULL; + goto failed_mount; + } + } + /* Set defaults before we parse the mount options */ def_mount_opts = le32_to_cpu(es->s_default_mount_opts); set_opt(sb, INIT_INODE_TABLE); @@ -3728,6 +3742,8 @@ failed_mount2: brelse(sbi->s_group_desc[i]); ext4_kvfree(sbi->s_group_desc); failed_mount: + if (sbi->s_chksum_driver) + crypto_free_shash(sbi->s_chksum_driver); if (sbi->s_proc) { remove_proc_entry("options", sbi->s_proc); remove_proc_entry(sb->s_id, ext4_proc_root); |