11 static __le32 ext4_mmp_csum(struct super_block *sb, struct mmp_struct *mmp)  in ext4_mmp_csum()  argument
13 	struct ext4_sb_info *sbi = EXT4_SB(sb);  in ext4_mmp_csum()
22 static int ext4_mmp_csum_verify(struct super_block *sb, struct mmp_struct *mmp)  in ext4_mmp_csum_verify()  argument
24 	if (!ext4_has_metadata_csum(sb))  in ext4_mmp_csum_verify()
27 	return mmp->mmp_checksum == ext4_mmp_csum(sb, mmp);  in ext4_mmp_csum_verify()
30 static void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp)  in ext4_mmp_csum_set()  argument
32 	if (!ext4_has_metadata_csum(sb))  in ext4_mmp_csum_set()
35 	mmp->mmp_checksum = ext4_mmp_csum(sb, mmp);  in ext4_mmp_csum_set()
42 static int write_mmp_block(struct super_block *sb, struct buffer_head *bh)  in write_mmp_block()  argument
50 	sb_start_write(sb);  in write_mmp_block()
51 	ext4_mmp_csum_set(sb, mmp);  in write_mmp_block()
57 	sb_end_write(sb);  in write_mmp_block()
68 static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,  in read_mmp_block()  argument
81 		*bh = sb_getblk(sb, mmp_block);  in read_mmp_block()
102 	if (!ext4_mmp_csum_verify(sb, mmp)) {  in read_mmp_block()
110 	ext4_warning(sb, "Error %d while reading MMP block %llu",  in read_mmp_block()
118 void __dump_mmp_msg(struct super_block *sb, struct mmp_struct *mmp,  in __dump_mmp_msg()  argument
121 	__ext4_warning(sb, function, line, "%s", msg);  in __dump_mmp_msg()
122 	__ext4_warning(sb, function, line,  in __dump_mmp_msg()
134 	struct super_block *sb = ((struct mmpd_data *) data)->sb;  in kmmpd()  local
136 	struct ext4_super_block *es = EXT4_SB(sb)->s_es;  in kmmpd()
170 		retval = write_mmp_block(sb, bh);  in kmmpd()
177 				ext4_error(sb, "Error writing to MMP block");  in kmmpd()
183 			ext4_warning(sb, "kmmpd being stopped since MMP feature"  in kmmpd()
188 		if (sb_rdonly(sb))  in kmmpd()
206 			retval = read_mmp_block(sb, &bh_check, mmp_block);  in kmmpd()
208 				ext4_error(sb, "error reading MMP data: %d",  in kmmpd()
217 				dump_mmp_msg(sb, mmp_check,  in kmmpd()
221 				ext4_error(sb, "abort");  in kmmpd()
245 	retval = write_mmp_block(sb, bh);  in kmmpd()
248 	EXT4_SB(sb)->s_mmp_tsk = NULL;  in kmmpd()
272 int ext4_multi_mount_protect(struct super_block *sb,  in ext4_multi_mount_protect()  argument
275 	struct ext4_super_block *es = EXT4_SB(sb)->s_es;  in ext4_multi_mount_protect()
286 		ext4_warning(sb, "Invalid MMP block in superblock");  in ext4_multi_mount_protect()
290 	retval = read_mmp_block(sb, &bh, mmp_block);  in ext4_multi_mount_protect()
311 		dump_mmp_msg(sb, mmp, "fsck is running on the filesystem");  in ext4_multi_mount_protect()
320 		ext4_warning(sb, "MMP interval %u higher than expected, please"  in ext4_multi_mount_protect()
324 		ext4_warning(sb, "MMP startup interrupted, failing mount\n");  in ext4_multi_mount_protect()
328 	retval = read_mmp_block(sb, &bh, mmp_block);  in ext4_multi_mount_protect()
333 		dump_mmp_msg(sb, mmp,  in ext4_multi_mount_protect()
345 	retval = write_mmp_block(sb, bh);  in ext4_multi_mount_protect()
353 		ext4_warning(sb, "MMP startup interrupted, failing mount");  in ext4_multi_mount_protect()
357 	retval = read_mmp_block(sb, &bh, mmp_block);  in ext4_multi_mount_protect()
362 		dump_mmp_msg(sb, mmp,  in ext4_multi_mount_protect()
369 		ext4_warning(sb, "not enough memory for mmpd_data");  in ext4_multi_mount_protect()
372 	mmpd_data->sb = sb;  in ext4_multi_mount_protect()
378 	EXT4_SB(sb)->s_mmp_tsk = kthread_run(kmmpd, mmpd_data, "kmmpd-%s",  in ext4_multi_mount_protect()
381 	if (IS_ERR(EXT4_SB(sb)->s_mmp_tsk)) {  in ext4_multi_mount_protect()
382 		EXT4_SB(sb)->s_mmp_tsk = NULL;  in ext4_multi_mount_protect()
384 		ext4_warning(sb, "Unable to create kmmpd thread for %s.",  in ext4_multi_mount_protect()
385 			     sb->s_id);  in ext4_multi_mount_protect()