30 static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
32 static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);
36 	struct nilfs_segment_buffer *segbuf;  in nilfs_segbuf_new()  local
38 	segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS);  in nilfs_segbuf_new()
39 	if (unlikely(!segbuf))  in nilfs_segbuf_new()
42 	segbuf->sb_super = sb;  in nilfs_segbuf_new()
43 	INIT_LIST_HEAD(&segbuf->sb_list);  in nilfs_segbuf_new()
44 	INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);  in nilfs_segbuf_new()
45 	INIT_LIST_HEAD(&segbuf->sb_payload_buffers);  in nilfs_segbuf_new()
46 	segbuf->sb_super_root = NULL;  in nilfs_segbuf_new()
48 	init_completion(&segbuf->sb_bio_event);  in nilfs_segbuf_new()
49 	atomic_set(&segbuf->sb_err, 0);  in nilfs_segbuf_new()
50 	segbuf->sb_nbio = 0;  in nilfs_segbuf_new()
52 	return segbuf;  in nilfs_segbuf_new()
55 void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf)  in nilfs_segbuf_free()  argument
57 	kmem_cache_free(nilfs_segbuf_cachep, segbuf);  in nilfs_segbuf_free()
60 void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,  in nilfs_segbuf_map()  argument
63 	segbuf->sb_segnum = segnum;  in nilfs_segbuf_map()
64 	nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start,  in nilfs_segbuf_map()
65 				&segbuf->sb_fseg_end);  in nilfs_segbuf_map()
67 	segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset;  in nilfs_segbuf_map()
68 	segbuf->sb_rest_blocks =  in nilfs_segbuf_map()
69 		segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;  in nilfs_segbuf_map()
77 void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_map_cont()  argument
80 	segbuf->sb_segnum = prev->sb_segnum;  in nilfs_segbuf_map_cont()
81 	segbuf->sb_fseg_start = prev->sb_fseg_start;  in nilfs_segbuf_map_cont()
82 	segbuf->sb_fseg_end = prev->sb_fseg_end;  in nilfs_segbuf_map_cont()
83 	segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks;  in nilfs_segbuf_map_cont()
84 	segbuf->sb_rest_blocks =  in nilfs_segbuf_map_cont()
85 		segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;  in nilfs_segbuf_map_cont()
88 void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_set_next_segnum()  argument
91 	segbuf->sb_nextnum = nextnum;  in nilfs_segbuf_set_next_segnum()
92 	segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum);  in nilfs_segbuf_set_next_segnum()
95 int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf)  in nilfs_segbuf_extend_segsum()  argument
99 	bh = sb_getblk(segbuf->sb_super,  in nilfs_segbuf_extend_segsum()
100 		       segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk);  in nilfs_segbuf_extend_segsum()
110 	nilfs_segbuf_add_segsum_buffer(segbuf, bh);  in nilfs_segbuf_extend_segsum()
114 int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_extend_payload()  argument
119 	bh = sb_getblk(segbuf->sb_super,  in nilfs_segbuf_extend_payload()
120 		       segbuf->sb_pseg_start + segbuf->sb_sum.nblocks);  in nilfs_segbuf_extend_payload()
124 	nilfs_segbuf_add_payload_buffer(segbuf, bh);  in nilfs_segbuf_extend_payload()
129 int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned int flags,  in nilfs_segbuf_reset()  argument
134 	segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0;  in nilfs_segbuf_reset()
135 	err = nilfs_segbuf_extend_segsum(segbuf);  in nilfs_segbuf_reset()
139 	segbuf->sb_sum.flags = flags;  in nilfs_segbuf_reset()
140 	segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary);  in nilfs_segbuf_reset()
141 	segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0;  in nilfs_segbuf_reset()
142 	segbuf->sb_sum.ctime = ctime;  in nilfs_segbuf_reset()
143 	segbuf->sb_sum.cno = cno;  in nilfs_segbuf_reset()
150 void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf)  in nilfs_segbuf_fill_in_segsum()  argument
155 	bh_sum = list_entry(segbuf->sb_segsum_buffers.next,  in nilfs_segbuf_fill_in_segsum()
161 	raw_sum->ss_flags    = cpu_to_le16(segbuf->sb_sum.flags);  in nilfs_segbuf_fill_in_segsum()
162 	raw_sum->ss_seq      = cpu_to_le64(segbuf->sb_sum.seg_seq);  in nilfs_segbuf_fill_in_segsum()
163 	raw_sum->ss_create   = cpu_to_le64(segbuf->sb_sum.ctime);  in nilfs_segbuf_fill_in_segsum()
164 	raw_sum->ss_next     = cpu_to_le64(segbuf->sb_sum.next);  in nilfs_segbuf_fill_in_segsum()
165 	raw_sum->ss_nblocks  = cpu_to_le32(segbuf->sb_sum.nblocks);  in nilfs_segbuf_fill_in_segsum()
166 	raw_sum->ss_nfinfo   = cpu_to_le32(segbuf->sb_sum.nfinfo);  in nilfs_segbuf_fill_in_segsum()
167 	raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes);  in nilfs_segbuf_fill_in_segsum()
169 	raw_sum->ss_cno      = cpu_to_le64(segbuf->sb_sum.cno);  in nilfs_segbuf_fill_in_segsum()
176 nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, u32 seed)  in nilfs_segbuf_fill_in_segsum_crc()  argument
180 	unsigned long size, bytes = segbuf->sb_sum.sumbytes;  in nilfs_segbuf_fill_in_segsum_crc()
183 	bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,  in nilfs_segbuf_fill_in_segsum_crc()
194 	list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,  in nilfs_segbuf_fill_in_segsum_crc()
203 static void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_fill_in_data_crc()  argument
211 	bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head,  in nilfs_segbuf_fill_in_data_crc()
218 	list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers,  in nilfs_segbuf_fill_in_data_crc()
222 	list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {  in nilfs_segbuf_fill_in_data_crc()
231 nilfs_segbuf_fill_in_super_root_crc(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_fill_in_super_root_crc()  argument
235 	struct the_nilfs *nilfs = segbuf->sb_super->s_fs_info;  in nilfs_segbuf_fill_in_super_root_crc()
239 	raw_sr = (struct nilfs_super_root *)segbuf->sb_super_root->b_data;  in nilfs_segbuf_fill_in_super_root_crc()
257 static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)  in nilfs_segbuf_clear()  argument
259 	nilfs_release_buffers(&segbuf->sb_segsum_buffers);  in nilfs_segbuf_clear()
260 	nilfs_release_buffers(&segbuf->sb_payload_buffers);  in nilfs_segbuf_clear()
261 	segbuf->sb_super_root = NULL;  in nilfs_segbuf_clear()
269 	struct nilfs_segment_buffer *segbuf;  in nilfs_clear_logs()  local
271 	list_for_each_entry(segbuf, logs, sb_list)  in nilfs_clear_logs()
272 		nilfs_segbuf_clear(segbuf);  in nilfs_clear_logs()
278 	struct nilfs_segment_buffer *n, *segbuf;  in nilfs_truncate_logs()  local
280 	segbuf = list_prepare_entry(last, logs, sb_list);  in nilfs_truncate_logs()
281 	list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) {  in nilfs_truncate_logs()
282 		list_del_init(&segbuf->sb_list);  in nilfs_truncate_logs()
283 		nilfs_segbuf_clear(segbuf);  in nilfs_truncate_logs()
284 		nilfs_segbuf_free(segbuf);  in nilfs_truncate_logs()
290 	struct nilfs_segment_buffer *segbuf;  in nilfs_write_logs()  local
293 	list_for_each_entry(segbuf, logs, sb_list) {  in nilfs_write_logs()
294 		ret = nilfs_segbuf_write(segbuf, nilfs);  in nilfs_write_logs()
303 	struct nilfs_segment_buffer *segbuf;  in nilfs_wait_on_logs()  local
306 	list_for_each_entry(segbuf, logs, sb_list) {  in nilfs_wait_on_logs()
307 		err = nilfs_segbuf_wait(segbuf);  in nilfs_wait_on_logs()
321 	struct nilfs_segment_buffer *segbuf;  in nilfs_add_checksums_on_logs()  local
323 	list_for_each_entry(segbuf, logs, sb_list) {  in nilfs_add_checksums_on_logs()
324 		if (segbuf->sb_super_root)  in nilfs_add_checksums_on_logs()
325 			nilfs_segbuf_fill_in_super_root_crc(segbuf, seed);  in nilfs_add_checksums_on_logs()
326 		nilfs_segbuf_fill_in_segsum_crc(segbuf, seed);  in nilfs_add_checksums_on_logs()
327 		nilfs_segbuf_fill_in_data_crc(segbuf, seed);  in nilfs_add_checksums_on_logs()
336 	struct nilfs_segment_buffer *segbuf = bio->bi_private;  in nilfs_end_bio_write()  local
339 		atomic_inc(&segbuf->sb_err);  in nilfs_end_bio_write()
342 	complete(&segbuf->sb_bio_event);  in nilfs_end_bio_write()
345 static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_submit_bio()  argument
352 	if (segbuf->sb_nbio > 0 &&  in nilfs_segbuf_submit_bio()
353 	    bdi_write_congested(segbuf->sb_super->s_bdi)) {  in nilfs_segbuf_submit_bio()
354 		wait_for_completion(&segbuf->sb_bio_event);  in nilfs_segbuf_submit_bio()
355 		segbuf->sb_nbio--;  in nilfs_segbuf_submit_bio()
356 		if (unlikely(atomic_read(&segbuf->sb_err))) {  in nilfs_segbuf_submit_bio()
364 	bio->bi_private = segbuf;  in nilfs_segbuf_submit_bio()
367 	segbuf->sb_nbio++;  in nilfs_segbuf_submit_bio()
407 static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_prepare_write()  argument
411 	wi->rest_blocks = segbuf->sb_sum.nblocks;  in nilfs_segbuf_prepare_write()
415 	wi->blocknr = segbuf->sb_pseg_start;  in nilfs_segbuf_prepare_write()
418 static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_submit_bh()  argument
439 	err = nilfs_segbuf_submit_bio(segbuf, wi, mode, 0);  in nilfs_segbuf_submit_bh()
458 static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,  in nilfs_segbuf_write()  argument
466 	nilfs_segbuf_prepare_write(segbuf, &wi);  in nilfs_segbuf_write()
468 	list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) {  in nilfs_segbuf_write()
469 		res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE);  in nilfs_segbuf_write()
474 	list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {  in nilfs_segbuf_write()
475 		res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE);  in nilfs_segbuf_write()
485 		res = nilfs_segbuf_submit_bio(segbuf, &wi, REQ_OP_WRITE,  in nilfs_segbuf_write()
502 static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf)  in nilfs_segbuf_wait()  argument
506 	if (!segbuf->sb_nbio)  in nilfs_segbuf_wait()
510 		wait_for_completion(&segbuf->sb_bio_event);  in nilfs_segbuf_wait()
511 	} while (--segbuf->sb_nbio > 0);  in nilfs_segbuf_wait()
513 	if (unlikely(atomic_read(&segbuf->sb_err) > 0)) {  in nilfs_segbuf_wait()
514 		nilfs_err(segbuf->sb_super,  in nilfs_segbuf_wait()
516 			  (unsigned long long)segbuf->sb_pseg_start,  in nilfs_segbuf_wait()
517 			  segbuf->sb_sum.nblocks,  in nilfs_segbuf_wait()
518 			  (unsigned long long)segbuf->sb_segnum);  in nilfs_segbuf_wait()