10 static __le32 ext4_mmp_csum(struct super_block *sb, struct mmp_struct *mmp)  in ext4_mmp_csum()  argument
12 	struct ext4_sb_info *sbi = EXT4_SB(sb);  in ext4_mmp_csum()
21 static int ext4_mmp_csum_verify(struct super_block *sb, struct mmp_struct *mmp)  in ext4_mmp_csum_verify()  argument
23 	if (!ext4_has_metadata_csum(sb))  in ext4_mmp_csum_verify()
26 	return mmp->mmp_checksum == ext4_mmp_csum(sb, mmp);  in ext4_mmp_csum_verify()
29 static void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp)  in ext4_mmp_csum_set()  argument
31 	if (!ext4_has_metadata_csum(sb))  in ext4_mmp_csum_set()
34 	mmp->mmp_checksum = ext4_mmp_csum(sb, mmp);  in ext4_mmp_csum_set()
41 static int write_mmp_block(struct super_block *sb, struct buffer_head *bh)  in write_mmp_block()  argument
49 	sb_start_write(sb);  in write_mmp_block()
50 	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
80 		*bh = sb_getblk(sb, mmp_block);  in read_mmp_block()
95 		ext4_warning(sb, "Error while reading MMP block %llu",  in read_mmp_block()
102 	    !ext4_mmp_csum_verify(sb, mmp))  in read_mmp_block()
111 void __dump_mmp_msg(struct super_block *sb, struct mmp_struct *mmp,  in __dump_mmp_msg()  argument
114 	__ext4_warning(sb, function, line, msg);  in __dump_mmp_msg()
115 	__ext4_warning(sb, function, line,  in __dump_mmp_msg()
127 	struct super_block *sb = ((struct mmpd_data *) data)->sb;  in kmmpd()  local
129 	struct ext4_super_block *es = EXT4_SB(sb)->s_es;  in kmmpd()
163 		retval = write_mmp_block(sb, bh);  in kmmpd()
170 				ext4_error(sb, "Error writing to MMP block");  in kmmpd()
176 			ext4_warning(sb, "kmmpd being stopped since MMP feature"  in kmmpd()
178 			EXT4_SB(sb)->s_mmp_tsk = NULL;  in kmmpd()
182 		if (sb->s_flags & MS_RDONLY) {  in kmmpd()
183 			ext4_warning(sb, "kmmpd being stopped since filesystem "  in kmmpd()
185 			EXT4_SB(sb)->s_mmp_tsk = NULL;  in kmmpd()
204 			retval = read_mmp_block(sb, &bh_check, mmp_block);  in kmmpd()
206 				ext4_error(sb, "error reading MMP data: %d",  in kmmpd()
209 				EXT4_SB(sb)->s_mmp_tsk = NULL;  in kmmpd()
217 				dump_mmp_msg(sb, mmp_check,  in kmmpd()
221 				ext4_error(sb, "abort");  in kmmpd()
243 	retval = write_mmp_block(sb, bh);  in kmmpd()
269 int ext4_multi_mount_protect(struct super_block *sb,  in ext4_multi_mount_protect()  argument
272 	struct ext4_super_block *es = EXT4_SB(sb)->s_es;  in ext4_multi_mount_protect()
283 		ext4_warning(sb, "Invalid MMP block in superblock");  in ext4_multi_mount_protect()
287 	retval = read_mmp_block(sb, &bh, mmp_block);  in ext4_multi_mount_protect()
308 		dump_mmp_msg(sb, mmp, "fsck is running on the filesystem");  in ext4_multi_mount_protect()
317 		ext4_warning(sb, "MMP interval %u higher than expected, please"  in ext4_multi_mount_protect()
321 		ext4_warning(sb, "MMP startup interrupted, failing mount\n");  in ext4_multi_mount_protect()
325 	retval = read_mmp_block(sb, &bh, mmp_block);  in ext4_multi_mount_protect()
330 		dump_mmp_msg(sb, mmp,  in ext4_multi_mount_protect()
342 	retval = write_mmp_block(sb, bh);  in ext4_multi_mount_protect()
350 		ext4_warning(sb, "MMP startup interrupted, failing mount\n");  in ext4_multi_mount_protect()
354 	retval = read_mmp_block(sb, &bh, mmp_block);  in ext4_multi_mount_protect()
359 		dump_mmp_msg(sb, mmp,  in ext4_multi_mount_protect()
366 		ext4_warning(sb, "not enough memory for mmpd_data");  in ext4_multi_mount_protect()
369 	mmpd_data->sb = sb;  in ext4_multi_mount_protect()
375 	EXT4_SB(sb)->s_mmp_tsk = kthread_run(kmmpd, mmpd_data, "kmmpd-%s",  in ext4_multi_mount_protect()
378 	if (IS_ERR(EXT4_SB(sb)->s_mmp_tsk)) {  in ext4_multi_mount_protect()
379 		EXT4_SB(sb)->s_mmp_tsk = NULL;  in ext4_multi_mount_protect()
381 		ext4_warning(sb, "Unable to create kmmpd thread for %s.",  in ext4_multi_mount_protect()
382 			     sb->s_id);  in ext4_multi_mount_protect()