1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2006-2008 Nokia Corporation.
21  * scan_for_master - search the valid master node.
22  * @c: UBIFS file-system description object
25  * node. Returns zero in case of success, %-EUCLEAN if there master area is
29 static int scan_for_master(struct ubifs_info *c)  in scan_for_master()  argument
37 	sleb = ubifs_scan(c, lnum, 0, c->sbuf, 1);  in scan_for_master()
40 	nodes_cnt = sleb->nodes_cnt;  in scan_for_master()
42 		snod = list_entry(sleb->nodes.prev, struct ubifs_scan_node,  in scan_for_master()
44 		if (snod->type != UBIFS_MST_NODE)  in scan_for_master()
46 		memcpy(c->mst_node, snod->node, snod->len);  in scan_for_master()
47 		offs = snod->offs;  in scan_for_master()
53 	sleb = ubifs_scan(c, lnum, 0, c->sbuf, 1);  in scan_for_master()
56 	if (sleb->nodes_cnt != nodes_cnt)  in scan_for_master()
58 	if (!sleb->nodes_cnt)  in scan_for_master()
60 	snod = list_entry(sleb->nodes.prev, struct ubifs_scan_node, list);  in scan_for_master()
61 	if (snod->type != UBIFS_MST_NODE)  in scan_for_master()
63 	if (snod->offs != offs)  in scan_for_master()
65 	if (memcmp((void *)c->mst_node + UBIFS_CH_SZ,  in scan_for_master()
66 		   (void *)snod->node + UBIFS_CH_SZ,  in scan_for_master()
67 		   UBIFS_MST_NODE_SZ - UBIFS_CH_SZ))  in scan_for_master()
69 	c->mst_offs = offs;  in scan_for_master()
75 	return -EUCLEAN;  in scan_for_master()
78 	ubifs_err(c, "unexpected node type %d master LEB %d:%d",  in scan_for_master()
79 		  snod->type, lnum, snod->offs);  in scan_for_master()
81 	return -EINVAL;  in scan_for_master()
85  * validate_master - validate master node.
86  * @c: UBIFS file-system description object
89  * if the data is all right and %-EINVAL if not.
91 static int validate_master(const struct ubifs_info *c)  in validate_master()  argument
96 	if (c->max_sqnum >= SQNUM_WATERMARK) {  in validate_master()
101 	if (c->cmt_no >= c->max_sqnum) {  in validate_master()
106 	if (c->highest_inum >= INUM_WATERMARK) {  in validate_master()
111 	if (c->lhead_lnum < UBIFS_LOG_LNUM ||  in validate_master()
112 	    c->lhead_lnum >= UBIFS_LOG_LNUM + c->log_lebs ||  in validate_master()
113 	    c->lhead_offs < 0 || c->lhead_offs >= c->leb_size ||  in validate_master()
114 	    c->lhead_offs & (c->min_io_size - 1)) {  in validate_master()
119 	if (c->zroot.lnum >= c->leb_cnt || c->zroot.lnum < c->main_first ||  in validate_master()
120 	    c->zroot.offs >= c->leb_size || c->zroot.offs & 7) {  in validate_master()
125 	if (c->zroot.len < c->ranges[UBIFS_IDX_NODE].min_len ||  in validate_master()
126 	    c->zroot.len > c->ranges[UBIFS_IDX_NODE].max_len) {  in validate_master()
131 	if (c->gc_lnum >= c->leb_cnt || c->gc_lnum < c->main_first) {  in validate_master()
136 	if (c->ihead_lnum >= c->leb_cnt || c->ihead_lnum < c->main_first ||  in validate_master()
137 	    c->ihead_offs % c->min_io_size || c->ihead_offs < 0 ||  in validate_master()
138 	    c->ihead_offs > c->leb_size || c->ihead_offs & 7) {  in validate_master()
143 	main_sz = (long long)c->main_lebs * c->leb_size;  in validate_master()
144 	if (c->bi.old_idx_sz & 7 || c->bi.old_idx_sz >= main_sz) {  in validate_master()
149 	if (c->lpt_lnum < c->lpt_first || c->lpt_lnum > c->lpt_last ||  in validate_master()
150 	    c->lpt_offs < 0 || c->lpt_offs + c->nnode_sz > c->leb_size) {  in validate_master()
155 	if (c->nhead_lnum < c->lpt_first || c->nhead_lnum > c->lpt_last ||  in validate_master()
156 	    c->nhead_offs < 0 || c->nhead_offs % c->min_io_size ||  in validate_master()
157 	    c->nhead_offs > c->leb_size) {  in validate_master()
162 	if (c->ltab_lnum < c->lpt_first || c->ltab_lnum > c->lpt_last ||  in validate_master()
163 	    c->ltab_offs < 0 ||  in validate_master()
164 	    c->ltab_offs + c->ltab_sz > c->leb_size) {  in validate_master()
169 	if (c->big_lpt && (c->lsave_lnum < c->lpt_first ||  in validate_master()
170 	    c->lsave_lnum > c->lpt_last || c->lsave_offs < 0 ||  in validate_master()
171 	    c->lsave_offs + c->lsave_sz > c->leb_size)) {  in validate_master()
176 	if (c->lscan_lnum < c->main_first || c->lscan_lnum >= c->leb_cnt) {  in validate_master()
181 	if (c->lst.empty_lebs < 0 || c->lst.empty_lebs > c->main_lebs - 2) {  in validate_master()
186 	if (c->lst.idx_lebs < 0 || c->lst.idx_lebs > c->main_lebs - 1) {  in validate_master()
191 	if (c->lst.total_free < 0 || c->lst.total_free > main_sz ||  in validate_master()
192 	    c->lst.total_free & 7) {  in validate_master()
197 	if (c->lst.total_dirty < 0 || (c->lst.total_dirty & 7)) {  in validate_master()
202 	if (c->lst.total_used < 0 || (c->lst.total_used & 7)) {  in validate_master()
207 	if (c->lst.total_free + c->lst.total_dirty +  in validate_master()
208 	    c->lst.total_used > main_sz) {  in validate_master()
213 	if (c->lst.total_dead + c->lst.total_dark +  in validate_master()
214 	    c->lst.total_used + c->bi.old_idx_sz > main_sz) {  in validate_master()
219 	if (c->lst.total_dead < 0 ||  in validate_master()
220 	    c->lst.total_dead > c->lst.total_free + c->lst.total_dirty ||  in validate_master()
221 	    c->lst.total_dead & 7) {  in validate_master()
226 	if (c->lst.total_dark < 0 ||  in validate_master()
227 	    c->lst.total_dark > c->lst.total_free + c->lst.total_dirty ||  in validate_master()
228 	    c->lst.total_dark & 7) {  in validate_master()
236 	ubifs_err(c, "bad master node at offset %d error %d", c->mst_offs, err);  in validate_master()
237 	ubifs_dump_node(c, c->mst_node);  in validate_master()
238 	return -EINVAL;  in validate_master()
242  * ubifs_read_master - read master node.
243  * @c: UBIFS file-system description object
245  * This function finds and reads the master node during file-system mount. If
249 int ubifs_read_master(struct ubifs_info *c)  in ubifs_read_master()  argument
253 	c->mst_node = kzalloc(c->mst_node_alsz, GFP_KERNEL);  in ubifs_read_master()
254 	if (!c->mst_node)  in ubifs_read_master()
255 		return -ENOMEM;  in ubifs_read_master()
257 	err = scan_for_master(c);  in ubifs_read_master()
259 		if (err == -EUCLEAN)  in ubifs_read_master()
260 			err = ubifs_recover_master_node(c);  in ubifs_read_master()
263 			 * Note, we do not free 'c->mst_node' here because the  in ubifs_read_master()
270 	c->mst_node->flags &= cpu_to_le32(~UBIFS_MST_RCVRY);  in ubifs_read_master()
272 	c->max_sqnum       = le64_to_cpu(c->mst_node->ch.sqnum);  in ubifs_read_master()
273 	c->highest_inum    = le64_to_cpu(c->mst_node->highest_inum);  in ubifs_read_master()
274 	c->cmt_no          = le64_to_cpu(c->mst_node->cmt_no);  in ubifs_read_master()
275 	c->zroot.lnum      = le32_to_cpu(c->mst_node->root_lnum);  in ubifs_read_master()
276 	c->zroot.offs      = le32_to_cpu(c->mst_node->root_offs);  in ubifs_read_master()
277 	c->zroot.len       = le32_to_cpu(c->mst_node->root_len);  in ubifs_read_master()
278 	c->lhead_lnum      = le32_to_cpu(c->mst_node->log_lnum);  in ubifs_read_master()
279 	c->gc_lnum         = le32_to_cpu(c->mst_node->gc_lnum);  in ubifs_read_master()
280 	c->ihead_lnum      = le32_to_cpu(c->mst_node->ihead_lnum);  in ubifs_read_master()
281 	c->ihead_offs      = le32_to_cpu(c->mst_node->ihead_offs);  in ubifs_read_master()
282 	c->bi.old_idx_sz   = le64_to_cpu(c->mst_node->index_size);  in ubifs_read_master()
283 	c->lpt_lnum        = le32_to_cpu(c->mst_node->lpt_lnum);  in ubifs_read_master()
284 	c->lpt_offs        = le32_to_cpu(c->mst_node->lpt_offs);  in ubifs_read_master()
285 	c->nhead_lnum      = le32_to_cpu(c->mst_node->nhead_lnum);  in ubifs_read_master()
286 	c->nhead_offs      = le32_to_cpu(c->mst_node->nhead_offs);  in ubifs_read_master()
287 	c->ltab_lnum       = le32_to_cpu(c->mst_node->ltab_lnum);  in ubifs_read_master()
288 	c->ltab_offs       = le32_to_cpu(c->mst_node->ltab_offs);  in ubifs_read_master()
289 	c->lsave_lnum      = le32_to_cpu(c->mst_node->lsave_lnum);  in ubifs_read_master()
290 	c->lsave_offs      = le32_to_cpu(c->mst_node->lsave_offs);  in ubifs_read_master()
291 	c->lscan_lnum      = le32_to_cpu(c->mst_node->lscan_lnum);  in ubifs_read_master()
292 	c->lst.empty_lebs  = le32_to_cpu(c->mst_node->empty_lebs);  in ubifs_read_master()
293 	c->lst.idx_lebs    = le32_to_cpu(c->mst_node->idx_lebs);  in ubifs_read_master()
294 	old_leb_cnt        = le32_to_cpu(c->mst_node->leb_cnt);  in ubifs_read_master()
295 	c->lst.total_free  = le64_to_cpu(c->mst_node->total_free);  in ubifs_read_master()
296 	c->lst.total_dirty = le64_to_cpu(c->mst_node->total_dirty);  in ubifs_read_master()
297 	c->lst.total_used  = le64_to_cpu(c->mst_node->total_used);  in ubifs_read_master()
298 	c->lst.total_dead  = le64_to_cpu(c->mst_node->total_dead);  in ubifs_read_master()
299 	c->lst.total_dark  = le64_to_cpu(c->mst_node->total_dark);  in ubifs_read_master()
301 	c->calc_idx_sz = c->bi.old_idx_sz;  in ubifs_read_master()
303 	if (c->mst_node->flags & cpu_to_le32(UBIFS_MST_NO_ORPHS))  in ubifs_read_master()
304 		c->no_orphs = 1;  in ubifs_read_master()
306 	if (old_leb_cnt != c->leb_cnt) {  in ubifs_read_master()
308 		int growth = c->leb_cnt - old_leb_cnt;  in ubifs_read_master()
310 		if (c->leb_cnt < old_leb_cnt ||  in ubifs_read_master()
311 		    c->leb_cnt < UBIFS_MIN_LEB_CNT) {  in ubifs_read_master()
312 			ubifs_err(c, "bad leb_cnt on master node");  in ubifs_read_master()
313 			ubifs_dump_node(c, c->mst_node);  in ubifs_read_master()
314 			return -EINVAL;  in ubifs_read_master()
318 			old_leb_cnt, c->leb_cnt);  in ubifs_read_master()
319 		c->lst.empty_lebs += growth;  in ubifs_read_master()
320 		c->lst.total_free += growth * (long long)c->leb_size;  in ubifs_read_master()
321 		c->lst.total_dark += growth * (long long)c->dark_wm;  in ubifs_read_master()
326 		 * remounting) in read-write mode, so we do not need to write it  in ubifs_read_master()
329 		c->mst_node->leb_cnt = cpu_to_le32(c->leb_cnt);  in ubifs_read_master()
330 		c->mst_node->empty_lebs = cpu_to_le32(c->lst.empty_lebs);  in ubifs_read_master()
331 		c->mst_node->total_free = cpu_to_le64(c->lst.total_free);  in ubifs_read_master()
332 		c->mst_node->total_dark = cpu_to_le64(c->lst.total_dark);  in ubifs_read_master()
335 	err = validate_master(c);  in ubifs_read_master()
340 	err = dbg_old_index_check_init(c, &c->zroot);  in ubifs_read_master()
348  * ubifs_write_master - write master node.
349  * @c: UBIFS file-system description object
355 int ubifs_write_master(struct ubifs_info *c)  in ubifs_write_master()  argument
359 	ubifs_assert(!c->ro_media && !c->ro_mount);  in ubifs_write_master()
360 	if (c->ro_error)  in ubifs_write_master()
361 		return -EROFS;  in ubifs_write_master()
364 	offs = c->mst_offs + c->mst_node_alsz;  in ubifs_write_master()
367 	if (offs + UBIFS_MST_NODE_SZ > c->leb_size) {  in ubifs_write_master()
368 		err = ubifs_leb_unmap(c, lnum);  in ubifs_write_master()
374 	c->mst_offs = offs;  in ubifs_write_master()
375 	c->mst_node->highest_inum = cpu_to_le64(c->highest_inum);  in ubifs_write_master()
377 	err = ubifs_write_node(c, c->mst_node, len, lnum, offs);  in ubifs_write_master()
384 		err = ubifs_leb_unmap(c, lnum);  in ubifs_write_master()
388 	err = ubifs_write_node(c, c->mst_node, len, lnum, offs);  in ubifs_write_master()