fs/ext4/mmp.c

43 				  struct buffer_head *bh)
45 	struct mmp_struct *mmp = (struct mmp_struct *)(bh->b_data);
48 	lock_buffer(bh);
49 	bh->b_end_io = end_buffer_write_sync;
50 	get_bh(bh);
51 	submit_bh(REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO, bh);
52 	wait_on_buffer(bh);
53 	if (unlikely(!buffer_uptodate(bh)))
58 static int write_mmp_block(struct super_block *sb, struct buffer_head *bh)
67 	err = write_mmp_block_thawed(sb, bh);
76 static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
82 	if (*bh)
83 		clear_buffer_uptodate(*bh);
88 	if (!*bh) {
89 		*bh = sb_getblk(sb, mmp_block);
90 		if (!*bh) {
96 	lock_buffer(*bh);
97 	ret = ext4_read_bh(*bh, REQ_META | REQ_PRIO, NULL, false);
101 	mmp = (struct mmp_struct *)((*bh)->b_data);
112 	brelse(*bh);
113 	*bh = NULL;
140 	struct buffer_head *bh = EXT4_SB(sb)->s_mmp_bh;
152 	mmp = (struct mmp_struct *)(bh->b_data);
178 		retval = write_mmp_block(sb, bh);
246 	retval = write_mmp_block(sb, bh);
283 	struct buffer_head *bh = NULL;
297 	retval = read_mmp_block(sb, &bh, mmp_block);
301 	mmp = (struct mmp_struct *)(bh->b_data);
337 	retval = read_mmp_block(sb, &bh, mmp_block);
340 	mmp = (struct mmp_struct *)(bh->b_data);
359 	retval = write_mmp_block_thawed(sb, bh);
372 	retval = read_mmp_block(sb, &bh, mmp_block);
375 	mmp = (struct mmp_struct *)(bh->b_data);
383 	EXT4_SB(sb)->s_mmp_bh = bh;
387 		 "%pg", bh->b_bdev);
406 	brelse(bh);