1 /* SPDX-License-Identifier: GPL-2.0+ */
3  * the_nilfs.h - the_nilfs shared structure.
5  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
19 #include <linux/backing-dev.h>
35  * struct the_nilfs - struct to supervise multiple nilfs mount points
42  * @ns_sbh: buffer heads of on-disk super blocks
50  * @ns_segnum: index number of the latest full segment.
51  * @ns_nextnum: index number of the full segment index to be used next
52  * @ns_pseg_offset: offset of next partial segment in the current full segment
68  * @ns_cptree: rb-tree of all mounted checkpoints (nilfs_root)
80  * @ns_blocksize_bits: bit length of block size
87  * @ns_inode_size: size of on-disk inode
88  * @ns_first_ino: first not-special inode number
105 	 * - loading the latest checkpoint exclusively.
106 	 * - allocating a new full segment.
117 	 * The following fields are updated by a writable FS-instance.
193 #define THE_NILFS_FNS(bit, name)					\  argument
196 	set_bit(THE_NILFS_##bit, &(nilfs)->ns_flags);			\
200 	clear_bit(THE_NILFS_##bit, &(nilfs)->ns_flags);			\
204 	return test_bit(THE_NILFS_##bit, &(nilfs)->ns_flags);		\
216 	((nilfs)->ns_mount_opt &= ~NILFS_MOUNT_##opt)
218 	((nilfs)->ns_mount_opt |= NILFS_MOUNT_##opt)
219 #define nilfs_test_opt(nilfs, opt) ((nilfs)->ns_mount_opt & NILFS_MOUNT_##opt)
221 	((nilfs)->ns_mount_opt =					\
222 		(((nilfs)->ns_mount_opt & ~NILFS_MOUNT_##mask) |	\
226  * struct nilfs_root - nilfs root object
228  * @rb_node: red-black tree node
263 	return t < nilfs->ns_sbwtime ||  in nilfs_sb_need_update()
264 		t > nilfs->ns_sbwtime + nilfs->ns_sb_update_freq;  in nilfs_sb_need_update()
269 	int flip_bits = nilfs->ns_sbwcount & 0x0FL;  in nilfs_sb_will_flip()
294 	refcount_inc(&root->count);  in nilfs_get_root()
301 	down_read(&nilfs->ns_sem);  in nilfs_valid_fs()
302 	valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS);  in nilfs_valid_fs()
303 	up_read(&nilfs->ns_sem);  in nilfs_valid_fs()
311 	*seg_start = (sector_t)nilfs->ns_blocks_per_segment * segnum;  in nilfs_get_segment_range()
312 	*seg_end = *seg_start + nilfs->ns_blocks_per_segment - 1;  in nilfs_get_segment_range()
314 		*seg_start = nilfs->ns_first_data_block;  in nilfs_get_segment_range()
320 	return (segnum == 0) ? nilfs->ns_first_data_block :  in nilfs_get_segment_start_blocknr()
321 		(sector_t)nilfs->ns_blocks_per_segment * segnum;  in nilfs_get_segment_start_blocknr()
329 	sector_div(segnum, nilfs->ns_blocks_per_segment);  in nilfs_get_segnum_of_block()
337 	/* terminate the current full segment (used in case of I/O-error) */  in nilfs_terminate_segment()
338 	nilfs->ns_pseg_offset = seg_end - seg_start + 1;  in nilfs_terminate_segment()
343 	/* move forward with a full segment */  in nilfs_shift_to_next_segment()
344 	nilfs->ns_segnum = nilfs->ns_nextnum;  in nilfs_shift_to_next_segment()
345 	nilfs->ns_pseg_offset = 0;  in nilfs_shift_to_next_segment()
346 	nilfs->ns_seg_seq++;  in nilfs_shift_to_next_segment()
353 	spin_lock(&nilfs->ns_last_segment_lock);  in nilfs_last_cno()
354 	cno = nilfs->ns_last_cno;  in nilfs_last_cno()
355 	spin_unlock(&nilfs->ns_last_segment_lock);  in nilfs_last_cno()
361 	return n == nilfs->ns_segnum || n == nilfs->ns_nextnum;  in nilfs_segment_is_active()
368 	if (!nilfs_test_opt(nilfs, BARRIER) || nilfs->ns_flushed_device)  in nilfs_flush_device()
371 	nilfs->ns_flushed_device = 1;  in nilfs_flush_device()
378 	err = blkdev_issue_flush(nilfs->ns_bdev, GFP_KERNEL);  in nilfs_flush_device()
379 	if (err != -EIO)  in nilfs_flush_device()