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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
e631ddba | 10 | * $Id: nodemgmt.c,v 1.125 2005/09/07 08:34:54 havasi Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mtd/mtd.h> | |
17 | #include <linux/compiler.h> | |
18 | #include <linux/sched.h> /* For cond_resched() */ | |
19 | #include "nodelist.h" | |
e631ddba | 20 | #include "debug.h" |
1da177e4 LT |
21 | |
22 | /** | |
23 | * jffs2_reserve_space - request physical space to write nodes to flash | |
24 | * @c: superblock info | |
25 | * @minsize: Minimum acceptable size of allocation | |
26 | * @ofs: Returned value of node offset | |
27 | * @len: Returned value of allocation length | |
28 | * @prio: Allocation type - ALLOC_{NORMAL,DELETION} | |
29 | * | |
30 | * Requests a block of physical space on the flash. Returns zero for success | |
31 | * and puts 'ofs' and 'len' into the appriopriate place, or returns -ENOSPC | |
32 | * or other error if appropriate. | |
33 | * | |
34 | * If it returns zero, jffs2_reserve_space() also downs the per-filesystem | |
35 | * allocation semaphore, to prevent more than one allocation from being | |
36 | * active at any time. The semaphore is later released by jffs2_commit_allocation() | |
37 | * | |
38 | * jffs2_reserve_space() may trigger garbage collection in order to make room | |
39 | * for the requested allocation. | |
40 | */ | |
41 | ||
e631ddba FH |
42 | static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, |
43 | uint32_t *ofs, uint32_t *len, uint32_t sumsize); | |
1da177e4 | 44 | |
e631ddba FH |
45 | int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs, |
46 | uint32_t *len, int prio, uint32_t sumsize) | |
1da177e4 LT |
47 | { |
48 | int ret = -EAGAIN; | |
49 | int blocksneeded = c->resv_blocks_write; | |
50 | /* align it */ | |
51 | minsize = PAD(minsize); | |
52 | ||
53 | D1(printk(KERN_DEBUG "jffs2_reserve_space(): Requested 0x%x bytes\n", minsize)); | |
54 | down(&c->alloc_sem); | |
55 | ||
56 | D1(printk(KERN_DEBUG "jffs2_reserve_space(): alloc sem got\n")); | |
57 | ||
58 | spin_lock(&c->erase_completion_lock); | |
59 | ||
60 | /* this needs a little more thought (true <tglx> :)) */ | |
61 | while(ret == -EAGAIN) { | |
62 | while(c->nr_free_blocks + c->nr_erasing_blocks < blocksneeded) { | |
63 | int ret; | |
64 | uint32_t dirty, avail; | |
65 | ||
66 | /* calculate real dirty size | |
67 | * dirty_size contains blocks on erase_pending_list | |
68 | * those blocks are counted in c->nr_erasing_blocks. | |
69 | * If one block is actually erased, it is not longer counted as dirty_space | |
70 | * but it is counted in c->nr_erasing_blocks, so we add it and subtract it | |
71 | * with c->nr_erasing_blocks * c->sector_size again. | |
72 | * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks | |
73 | * This helps us to force gc and pick eventually a clean block to spread the load. | |
74 | * We add unchecked_size here, as we hopefully will find some space to use. | |
75 | * This will affect the sum only once, as gc first finishes checking | |
76 | * of nodes. | |
77 | */ | |
78 | dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size + c->unchecked_size; | |
79 | if (dirty < c->nospc_dirty_size) { | |
80 | if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { | |
4132ace8 | 81 | D1(printk(KERN_NOTICE "jffs2_reserve_space(): Low on dirty space to GC, but it's a deletion. Allowing...\n")); |
1da177e4 LT |
82 | break; |
83 | } | |
84 | D1(printk(KERN_DEBUG "dirty size 0x%08x + unchecked_size 0x%08x < nospc_dirty_size 0x%08x, returning -ENOSPC\n", | |
85 | dirty, c->unchecked_size, c->sector_size)); | |
86 | ||
87 | spin_unlock(&c->erase_completion_lock); | |
88 | up(&c->alloc_sem); | |
89 | return -ENOSPC; | |
90 | } | |
91 | ||
92 | /* Calc possibly available space. Possibly available means that we | |
93 | * don't know, if unchecked size contains obsoleted nodes, which could give us some | |
94 | * more usable space. This will affect the sum only once, as gc first finishes checking | |
95 | * of nodes. | |
96 | + Return -ENOSPC, if the maximum possibly available space is less or equal than | |
97 | * blocksneeded * sector_size. | |
98 | * This blocks endless gc looping on a filesystem, which is nearly full, even if | |
99 | * the check above passes. | |
100 | */ | |
101 | avail = c->free_size + c->dirty_size + c->erasing_size + c->unchecked_size; | |
102 | if ( (avail / c->sector_size) <= blocksneeded) { | |
103 | if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { | |
4132ace8 | 104 | D1(printk(KERN_NOTICE "jffs2_reserve_space(): Low on possibly available space, but it's a deletion. Allowing...\n")); |
1da177e4 LT |
105 | break; |
106 | } | |
107 | ||
108 | D1(printk(KERN_DEBUG "max. available size 0x%08x < blocksneeded * sector_size 0x%08x, returning -ENOSPC\n", | |
109 | avail, blocksneeded * c->sector_size)); | |
110 | spin_unlock(&c->erase_completion_lock); | |
111 | up(&c->alloc_sem); | |
112 | return -ENOSPC; | |
113 | } | |
114 | ||
115 | up(&c->alloc_sem); | |
116 | ||
117 | D1(printk(KERN_DEBUG "Triggering GC pass. nr_free_blocks %d, nr_erasing_blocks %d, free_size 0x%08x, dirty_size 0x%08x, wasted_size 0x%08x, used_size 0x%08x, erasing_size 0x%08x, bad_size 0x%08x (total 0x%08x of 0x%08x)\n", | |
118 | c->nr_free_blocks, c->nr_erasing_blocks, c->free_size, c->dirty_size, c->wasted_size, c->used_size, c->erasing_size, c->bad_size, | |
119 | c->free_size + c->dirty_size + c->wasted_size + c->used_size + c->erasing_size + c->bad_size, c->flash_size)); | |
120 | spin_unlock(&c->erase_completion_lock); | |
121 | ||
122 | ret = jffs2_garbage_collect_pass(c); | |
123 | if (ret) | |
124 | return ret; | |
125 | ||
126 | cond_resched(); | |
127 | ||
128 | if (signal_pending(current)) | |
129 | return -EINTR; | |
130 | ||
131 | down(&c->alloc_sem); | |
132 | spin_lock(&c->erase_completion_lock); | |
133 | } | |
134 | ||
e631ddba | 135 | ret = jffs2_do_reserve_space(c, minsize, ofs, len, sumsize); |
1da177e4 LT |
136 | if (ret) { |
137 | D1(printk(KERN_DEBUG "jffs2_reserve_space: ret is %d\n", ret)); | |
138 | } | |
139 | } | |
140 | spin_unlock(&c->erase_completion_lock); | |
141 | if (ret) | |
142 | up(&c->alloc_sem); | |
143 | return ret; | |
144 | } | |
145 | ||
e631ddba FH |
146 | int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs, |
147 | uint32_t *len, uint32_t sumsize) | |
1da177e4 LT |
148 | { |
149 | int ret = -EAGAIN; | |
150 | minsize = PAD(minsize); | |
151 | ||
152 | D1(printk(KERN_DEBUG "jffs2_reserve_space_gc(): Requested 0x%x bytes\n", minsize)); | |
153 | ||
154 | spin_lock(&c->erase_completion_lock); | |
155 | while(ret == -EAGAIN) { | |
e631ddba | 156 | ret = jffs2_do_reserve_space(c, minsize, ofs, len, sumsize); |
1da177e4 LT |
157 | if (ret) { |
158 | D1(printk(KERN_DEBUG "jffs2_reserve_space_gc: looping, ret is %d\n", ret)); | |
159 | } | |
160 | } | |
161 | spin_unlock(&c->erase_completion_lock); | |
162 | return ret; | |
163 | } | |
164 | ||
e631ddba FH |
165 | |
166 | /* Classify nextblock (clean, dirty of verydirty) and force to select an other one */ | |
167 | ||
168 | static void jffs2_close_nextblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
1da177e4 | 169 | { |
e631ddba FH |
170 | |
171 | /* Check, if we have a dirty block now, or if it was dirty already */ | |
172 | if (ISDIRTY (jeb->wasted_size + jeb->dirty_size)) { | |
173 | c->dirty_size += jeb->wasted_size; | |
174 | c->wasted_size -= jeb->wasted_size; | |
175 | jeb->dirty_size += jeb->wasted_size; | |
176 | jeb->wasted_size = 0; | |
177 | if (VERYDIRTY(c, jeb->dirty_size)) { | |
178 | D1(printk(KERN_DEBUG "Adding full erase block at 0x%08x to very_dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", | |
179 | jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); | |
180 | list_add_tail(&jeb->list, &c->very_dirty_list); | |
181 | } else { | |
182 | D1(printk(KERN_DEBUG "Adding full erase block at 0x%08x to dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", | |
183 | jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); | |
184 | list_add_tail(&jeb->list, &c->dirty_list); | |
185 | } | |
186 | } else { | |
187 | D1(printk(KERN_DEBUG "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", | |
188 | jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); | |
189 | list_add_tail(&jeb->list, &c->clean_list); | |
190 | } | |
191 | c->nextblock = NULL; | |
192 | ||
193 | } | |
194 | ||
195 | /* Select a new jeb for nextblock */ | |
196 | ||
197 | static int jffs2_find_nextblock(struct jffs2_sb_info *c) | |
198 | { | |
199 | struct list_head *next; | |
1da177e4 | 200 | |
e631ddba FH |
201 | /* Take the next block off the 'free' list */ |
202 | ||
203 | if (list_empty(&c->free_list)) { | |
204 | ||
205 | if (!c->nr_erasing_blocks && | |
206 | !list_empty(&c->erasable_list)) { | |
207 | struct jffs2_eraseblock *ejeb; | |
208 | ||
209 | ejeb = list_entry(c->erasable_list.next, struct jffs2_eraseblock, list); | |
210 | list_del(&ejeb->list); | |
211 | list_add_tail(&ejeb->list, &c->erase_pending_list); | |
212 | c->nr_erasing_blocks++; | |
213 | jffs2_erase_pending_trigger(c); | |
214 | D1(printk(KERN_DEBUG "jffs2_find_nextblock: Triggering erase of erasable block at 0x%08x\n", | |
215 | ejeb->offset)); | |
216 | } | |
217 | ||
218 | if (!c->nr_erasing_blocks && | |
219 | !list_empty(&c->erasable_pending_wbuf_list)) { | |
220 | D1(printk(KERN_DEBUG "jffs2_find_nextblock: Flushing write buffer\n")); | |
221 | /* c->nextblock is NULL, no update to c->nextblock allowed */ | |
1da177e4 | 222 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
223 | jffs2_flush_wbuf_pad(c); |
224 | spin_lock(&c->erase_completion_lock); | |
e631ddba FH |
225 | /* Have another go. It'll be on the erasable_list now */ |
226 | return -EAGAIN; | |
1da177e4 | 227 | } |
e631ddba FH |
228 | |
229 | if (!c->nr_erasing_blocks) { | |
230 | /* Ouch. We're in GC, or we wouldn't have got here. | |
231 | And there's no space left. At all. */ | |
232 | printk(KERN_CRIT "Argh. No free space left for GC. nr_erasing_blocks is %d. nr_free_blocks is %d. (erasableempty: %s, erasingempty: %s, erasependingempty: %s)\n", | |
233 | c->nr_erasing_blocks, c->nr_free_blocks, list_empty(&c->erasable_list)?"yes":"no", | |
234 | list_empty(&c->erasing_list)?"yes":"no", list_empty(&c->erase_pending_list)?"yes":"no"); | |
235 | return -ENOSPC; | |
1da177e4 | 236 | } |
e631ddba FH |
237 | |
238 | spin_unlock(&c->erase_completion_lock); | |
239 | /* Don't wait for it; just erase one right now */ | |
240 | jffs2_erase_pending_blocks(c, 1); | |
241 | spin_lock(&c->erase_completion_lock); | |
242 | ||
243 | /* An erase may have failed, decreasing the | |
244 | amount of free space available. So we must | |
245 | restart from the beginning */ | |
246 | return -EAGAIN; | |
1da177e4 | 247 | } |
e631ddba FH |
248 | |
249 | next = c->free_list.next; | |
250 | list_del(next); | |
251 | c->nextblock = list_entry(next, struct jffs2_eraseblock, list); | |
252 | c->nr_free_blocks--; | |
1da177e4 | 253 | |
e631ddba FH |
254 | jffs2_sum_reset_collected(c->summary); /* reset collected summary */ |
255 | ||
256 | D1(printk(KERN_DEBUG "jffs2_find_nextblock(): new nextblock = 0x%08x\n", c->nextblock->offset)); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | /* Called with alloc sem _and_ erase_completion_lock */ | |
262 | static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs, uint32_t *len, uint32_t sumsize) | |
263 | { | |
264 | struct jffs2_eraseblock *jeb = c->nextblock; | |
265 | uint32_t reserved_size; /* for summary information at the end of the jeb */ | |
266 | int ret; | |
267 | ||
268 | restart: | |
269 | reserved_size = 0; | |
270 | ||
271 | if (jffs2_sum_active() && (sumsize != JFFS2_SUMMARY_NOSUM_SIZE)) { | |
272 | /* NOSUM_SIZE means not to generate summary */ | |
273 | ||
274 | if (jeb) { | |
275 | reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE); | |
276 | JFFS2_DBG_SUMMARY("minsize=%d , jeb->free=%d ," | |
277 | "summary->size=%d , sumsize=%d\n", | |
278 | minsize, jeb->free_size, | |
279 | c->summary->sum_size, sumsize); | |
280 | } | |
281 | ||
282 | /* Is there enough space for writing out the current node, or we have to | |
283 | write out summary information now, close this jeb and select new nextblock? */ | |
284 | if (jeb && (PAD(minsize) + PAD(c->summary->sum_size + sumsize + | |
285 | JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size)) { | |
286 | ||
287 | /* Has summary been disabled for this jeb? */ | |
288 | if (jffs2_sum_is_disabled(c->summary)) { | |
289 | sumsize = JFFS2_SUMMARY_NOSUM_SIZE; | |
290 | goto restart; | |
1da177e4 LT |
291 | } |
292 | ||
e631ddba FH |
293 | /* Writing out the collected summary information */ |
294 | JFFS2_DBG_SUMMARY("generating summary for 0x%08x.\n", jeb->offset); | |
295 | ret = jffs2_sum_write_sumnode(c); | |
296 | ||
297 | if (ret) | |
298 | return ret; | |
299 | ||
300 | if (jffs2_sum_is_disabled(c->summary)) { | |
301 | /* jffs2_write_sumnode() couldn't write out the summary information | |
302 | diabling summary for this jeb and free the collected information | |
303 | */ | |
304 | sumsize = JFFS2_SUMMARY_NOSUM_SIZE; | |
305 | goto restart; | |
306 | } | |
307 | ||
308 | jffs2_close_nextblock(c, jeb); | |
309 | jeb = NULL; | |
310 | } | |
311 | } else { | |
312 | if (jeb && minsize > jeb->free_size) { | |
313 | /* Skip the end of this block and file it as having some dirty space */ | |
314 | /* If there's a pending write to it, flush now */ | |
315 | ||
316 | if (jffs2_wbuf_dirty(c)) { | |
1da177e4 | 317 | spin_unlock(&c->erase_completion_lock); |
e631ddba | 318 | D1(printk(KERN_DEBUG "jffs2_do_reserve_space: Flushing write buffer\n")); |
1da177e4 LT |
319 | jffs2_flush_wbuf_pad(c); |
320 | spin_lock(&c->erase_completion_lock); | |
e631ddba FH |
321 | jeb = c->nextblock; |
322 | goto restart; | |
1da177e4 LT |
323 | } |
324 | ||
e631ddba FH |
325 | c->wasted_size += jeb->free_size; |
326 | c->free_size -= jeb->free_size; | |
327 | jeb->wasted_size += jeb->free_size; | |
328 | jeb->free_size = 0; | |
1da177e4 | 329 | |
e631ddba FH |
330 | jffs2_close_nextblock(c, jeb); |
331 | jeb = NULL; | |
1da177e4 | 332 | } |
e631ddba FH |
333 | } |
334 | ||
335 | if (!jeb) { | |
336 | ||
337 | ret = jffs2_find_nextblock(c); | |
338 | if (ret) | |
339 | return ret; | |
1da177e4 | 340 | |
e631ddba | 341 | jeb = c->nextblock; |
1da177e4 LT |
342 | |
343 | if (jeb->free_size != c->sector_size - c->cleanmarker_size) { | |
344 | printk(KERN_WARNING "Eep. Block 0x%08x taken from free_list had free_size of 0x%08x!!\n", jeb->offset, jeb->free_size); | |
345 | goto restart; | |
346 | } | |
347 | } | |
348 | /* OK, jeb (==c->nextblock) is now pointing at a block which definitely has | |
349 | enough space */ | |
350 | *ofs = jeb->offset + (c->sector_size - jeb->free_size); | |
e631ddba | 351 | *len = jeb->free_size - reserved_size; |
1da177e4 LT |
352 | |
353 | if (c->cleanmarker_size && jeb->used_size == c->cleanmarker_size && | |
354 | !jeb->first_node->next_in_ino) { | |
355 | /* Only node in it beforehand was a CLEANMARKER node (we think). | |
356 | So mark it obsolete now that there's going to be another node | |
357 | in the block. This will reduce used_size to zero but We've | |
358 | already set c->nextblock so that jffs2_mark_node_obsolete() | |
359 | won't try to refile it to the dirty_list. | |
360 | */ | |
361 | spin_unlock(&c->erase_completion_lock); | |
362 | jffs2_mark_node_obsolete(c, jeb->first_node); | |
363 | spin_lock(&c->erase_completion_lock); | |
364 | } | |
365 | ||
366 | D1(printk(KERN_DEBUG "jffs2_do_reserve_space(): Giving 0x%x bytes at 0x%x\n", *len, *ofs)); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | /** | |
371 | * jffs2_add_physical_node_ref - add a physical node reference to the list | |
372 | * @c: superblock info | |
373 | * @new: new node reference to add | |
374 | * @len: length of this physical node | |
375 | * @dirty: dirty flag for new node | |
376 | * | |
377 | * Should only be used to report nodes for which space has been allocated | |
378 | * by jffs2_reserve_space. | |
379 | * | |
380 | * Must be called with the alloc_sem held. | |
381 | */ | |
382 | ||
383 | int jffs2_add_physical_node_ref(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *new) | |
384 | { | |
385 | struct jffs2_eraseblock *jeb; | |
386 | uint32_t len; | |
387 | ||
388 | jeb = &c->blocks[new->flash_offset / c->sector_size]; | |
389 | len = ref_totlen(c, jeb, new); | |
390 | ||
391 | D1(printk(KERN_DEBUG "jffs2_add_physical_node_ref(): Node at 0x%x(%d), size 0x%x\n", ref_offset(new), ref_flags(new), len)); | |
392 | #if 1 | |
3118db3d EH |
393 | /* we could get some obsolete nodes after nextblock was refiled |
394 | in wbuf.c */ | |
9b88f473 EH |
395 | if ((c->nextblock || !ref_obsolete(new)) |
396 | &&(jeb != c->nextblock || ref_offset(new) != jeb->offset + (c->sector_size - jeb->free_size))) { | |
1da177e4 LT |
397 | printk(KERN_WARNING "argh. node added in wrong place\n"); |
398 | jffs2_free_raw_node_ref(new); | |
399 | return -EINVAL; | |
400 | } | |
401 | #endif | |
402 | spin_lock(&c->erase_completion_lock); | |
403 | ||
404 | if (!jeb->first_node) | |
405 | jeb->first_node = new; | |
406 | if (jeb->last_node) | |
407 | jeb->last_node->next_phys = new; | |
408 | jeb->last_node = new; | |
409 | ||
410 | jeb->free_size -= len; | |
411 | c->free_size -= len; | |
412 | if (ref_obsolete(new)) { | |
413 | jeb->dirty_size += len; | |
414 | c->dirty_size += len; | |
415 | } else { | |
416 | jeb->used_size += len; | |
417 | c->used_size += len; | |
418 | } | |
419 | ||
9b88f473 | 420 | if (!jeb->free_size && !jeb->dirty_size && !ISDIRTY(jeb->wasted_size)) { |
1da177e4 LT |
421 | /* If it lives on the dirty_list, jffs2_reserve_space will put it there */ |
422 | D1(printk(KERN_DEBUG "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", | |
423 | jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); | |
424 | if (jffs2_wbuf_dirty(c)) { | |
425 | /* Flush the last write in the block if it's outstanding */ | |
426 | spin_unlock(&c->erase_completion_lock); | |
427 | jffs2_flush_wbuf_pad(c); | |
428 | spin_lock(&c->erase_completion_lock); | |
429 | } | |
430 | ||
431 | list_add_tail(&jeb->list, &c->clean_list); | |
432 | c->nextblock = NULL; | |
433 | } | |
e0c8e42f AB |
434 | jffs2_dbg_acct_sanity_check_nolock(c,jeb); |
435 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); | |
1da177e4 LT |
436 | |
437 | spin_unlock(&c->erase_completion_lock); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | ||
443 | void jffs2_complete_reservation(struct jffs2_sb_info *c) | |
444 | { | |
445 | D1(printk(KERN_DEBUG "jffs2_complete_reservation()\n")); | |
446 | jffs2_garbage_collect_trigger(c); | |
447 | up(&c->alloc_sem); | |
448 | } | |
449 | ||
450 | static inline int on_list(struct list_head *obj, struct list_head *head) | |
451 | { | |
452 | struct list_head *this; | |
453 | ||
454 | list_for_each(this, head) { | |
455 | if (this == obj) { | |
456 | D1(printk("%p is on list at %p\n", obj, head)); | |
457 | return 1; | |
458 | ||
459 | } | |
460 | } | |
461 | return 0; | |
462 | } | |
463 | ||
464 | void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref) | |
465 | { | |
466 | struct jffs2_eraseblock *jeb; | |
467 | int blocknr; | |
468 | struct jffs2_unknown_node n; | |
469 | int ret, addedsize; | |
470 | size_t retlen; | |
471 | ||
472 | if(!ref) { | |
473 | printk(KERN_NOTICE "EEEEEK. jffs2_mark_node_obsolete called with NULL node\n"); | |
474 | return; | |
475 | } | |
476 | if (ref_obsolete(ref)) { | |
477 | D1(printk(KERN_DEBUG "jffs2_mark_node_obsolete called with already obsolete node at 0x%08x\n", ref_offset(ref))); | |
478 | return; | |
479 | } | |
480 | blocknr = ref->flash_offset / c->sector_size; | |
481 | if (blocknr >= c->nr_blocks) { | |
482 | printk(KERN_NOTICE "raw node at 0x%08x is off the end of device!\n", ref->flash_offset); | |
483 | BUG(); | |
484 | } | |
485 | jeb = &c->blocks[blocknr]; | |
486 | ||
487 | if (jffs2_can_mark_obsolete(c) && !jffs2_is_readonly(c) && | |
31fbdf7a | 488 | !(c->flags & (JFFS2_SB_FLAG_SCANNING | JFFS2_SB_FLAG_BUILDING))) { |
1da177e4 LT |
489 | /* Hm. This may confuse static lock analysis. If any of the above |
490 | three conditions is false, we're going to return from this | |
491 | function without actually obliterating any nodes or freeing | |
492 | any jffs2_raw_node_refs. So we don't need to stop erases from | |
493 | happening, or protect against people holding an obsolete | |
494 | jffs2_raw_node_ref without the erase_completion_lock. */ | |
495 | down(&c->erase_free_sem); | |
496 | } | |
497 | ||
498 | spin_lock(&c->erase_completion_lock); | |
499 | ||
500 | if (ref_flags(ref) == REF_UNCHECKED) { | |
501 | D1(if (unlikely(jeb->unchecked_size < ref_totlen(c, jeb, ref))) { | |
502 | printk(KERN_NOTICE "raw unchecked node of size 0x%08x freed from erase block %d at 0x%08x, but unchecked_size was already 0x%08x\n", | |
503 | ref_totlen(c, jeb, ref), blocknr, ref->flash_offset, jeb->used_size); | |
504 | BUG(); | |
505 | }) | |
506 | D1(printk(KERN_DEBUG "Obsoleting previously unchecked node at 0x%08x of len %x: ", ref_offset(ref), ref_totlen(c, jeb, ref))); | |
507 | jeb->unchecked_size -= ref_totlen(c, jeb, ref); | |
508 | c->unchecked_size -= ref_totlen(c, jeb, ref); | |
509 | } else { | |
510 | D1(if (unlikely(jeb->used_size < ref_totlen(c, jeb, ref))) { | |
511 | printk(KERN_NOTICE "raw node of size 0x%08x freed from erase block %d at 0x%08x, but used_size was already 0x%08x\n", | |
512 | ref_totlen(c, jeb, ref), blocknr, ref->flash_offset, jeb->used_size); | |
513 | BUG(); | |
514 | }) | |
e0c8e42f | 515 | D1(printk(KERN_DEBUG "Obsoleting node at 0x%08x of len %#x: ", ref_offset(ref), ref_totlen(c, jeb, ref))); |
1da177e4 LT |
516 | jeb->used_size -= ref_totlen(c, jeb, ref); |
517 | c->used_size -= ref_totlen(c, jeb, ref); | |
518 | } | |
519 | ||
520 | // Take care, that wasted size is taken into concern | |
521 | if ((jeb->dirty_size || ISDIRTY(jeb->wasted_size + ref_totlen(c, jeb, ref))) && jeb != c->nextblock) { | |
6f401a40 | 522 | D1(printk(KERN_DEBUG "Dirtying\n")); |
1da177e4 LT |
523 | addedsize = ref_totlen(c, jeb, ref); |
524 | jeb->dirty_size += ref_totlen(c, jeb, ref); | |
525 | c->dirty_size += ref_totlen(c, jeb, ref); | |
526 | ||
527 | /* Convert wasted space to dirty, if not a bad block */ | |
528 | if (jeb->wasted_size) { | |
529 | if (on_list(&jeb->list, &c->bad_used_list)) { | |
530 | D1(printk(KERN_DEBUG "Leaving block at %08x on the bad_used_list\n", | |
531 | jeb->offset)); | |
532 | addedsize = 0; /* To fool the refiling code later */ | |
533 | } else { | |
534 | D1(printk(KERN_DEBUG "Converting %d bytes of wasted space to dirty in block at %08x\n", | |
535 | jeb->wasted_size, jeb->offset)); | |
536 | addedsize += jeb->wasted_size; | |
537 | jeb->dirty_size += jeb->wasted_size; | |
538 | c->dirty_size += jeb->wasted_size; | |
539 | c->wasted_size -= jeb->wasted_size; | |
540 | jeb->wasted_size = 0; | |
541 | } | |
542 | } | |
543 | } else { | |
6f401a40 | 544 | D1(printk(KERN_DEBUG "Wasting\n")); |
1da177e4 LT |
545 | addedsize = 0; |
546 | jeb->wasted_size += ref_totlen(c, jeb, ref); | |
547 | c->wasted_size += ref_totlen(c, jeb, ref); | |
548 | } | |
549 | ref->flash_offset = ref_offset(ref) | REF_OBSOLETE; | |
550 | ||
e0c8e42f AB |
551 | jffs2_dbg_acct_sanity_check_nolock(c, jeb); |
552 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); | |
1da177e4 | 553 | |
31fbdf7a AB |
554 | if (c->flags & JFFS2_SB_FLAG_SCANNING) { |
555 | /* Flash scanning is in progress. Don't muck about with the block | |
1da177e4 LT |
556 | lists because they're not ready yet, and don't actually |
557 | obliterate nodes that look obsolete. If they weren't | |
558 | marked obsolete on the flash at the time they _became_ | |
559 | obsolete, there was probably a reason for that. */ | |
560 | spin_unlock(&c->erase_completion_lock); | |
561 | /* We didn't lock the erase_free_sem */ | |
562 | return; | |
563 | } | |
564 | ||
565 | if (jeb == c->nextblock) { | |
566 | D2(printk(KERN_DEBUG "Not moving nextblock 0x%08x to dirty/erase_pending list\n", jeb->offset)); | |
567 | } else if (!jeb->used_size && !jeb->unchecked_size) { | |
568 | if (jeb == c->gcblock) { | |
569 | D1(printk(KERN_DEBUG "gcblock at 0x%08x completely dirtied. Clearing gcblock...\n", jeb->offset)); | |
570 | c->gcblock = NULL; | |
571 | } else { | |
572 | D1(printk(KERN_DEBUG "Eraseblock at 0x%08x completely dirtied. Removing from (dirty?) list...\n", jeb->offset)); | |
573 | list_del(&jeb->list); | |
574 | } | |
575 | if (jffs2_wbuf_dirty(c)) { | |
576 | D1(printk(KERN_DEBUG "...and adding to erasable_pending_wbuf_list\n")); | |
577 | list_add_tail(&jeb->list, &c->erasable_pending_wbuf_list); | |
578 | } else { | |
579 | if (jiffies & 127) { | |
580 | /* Most of the time, we just erase it immediately. Otherwise we | |
581 | spend ages scanning it on mount, etc. */ | |
582 | D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n")); | |
583 | list_add_tail(&jeb->list, &c->erase_pending_list); | |
584 | c->nr_erasing_blocks++; | |
585 | jffs2_erase_pending_trigger(c); | |
586 | } else { | |
587 | /* Sometimes, however, we leave it elsewhere so it doesn't get | |
588 | immediately reused, and we spread the load a bit. */ | |
589 | D1(printk(KERN_DEBUG "...and adding to erasable_list\n")); | |
590 | list_add_tail(&jeb->list, &c->erasable_list); | |
591 | } | |
592 | } | |
593 | D1(printk(KERN_DEBUG "Done OK\n")); | |
594 | } else if (jeb == c->gcblock) { | |
595 | D2(printk(KERN_DEBUG "Not moving gcblock 0x%08x to dirty_list\n", jeb->offset)); | |
596 | } else if (ISDIRTY(jeb->dirty_size) && !ISDIRTY(jeb->dirty_size - addedsize)) { | |
597 | D1(printk(KERN_DEBUG "Eraseblock at 0x%08x is freshly dirtied. Removing from clean list...\n", jeb->offset)); | |
598 | list_del(&jeb->list); | |
599 | D1(printk(KERN_DEBUG "...and adding to dirty_list\n")); | |
600 | list_add_tail(&jeb->list, &c->dirty_list); | |
601 | } else if (VERYDIRTY(c, jeb->dirty_size) && | |
602 | !VERYDIRTY(c, jeb->dirty_size - addedsize)) { | |
603 | D1(printk(KERN_DEBUG "Eraseblock at 0x%08x is now very dirty. Removing from dirty list...\n", jeb->offset)); | |
604 | list_del(&jeb->list); | |
605 | D1(printk(KERN_DEBUG "...and adding to very_dirty_list\n")); | |
606 | list_add_tail(&jeb->list, &c->very_dirty_list); | |
607 | } else { | |
608 | D1(printk(KERN_DEBUG "Eraseblock at 0x%08x not moved anywhere. (free 0x%08x, dirty 0x%08x, used 0x%08x)\n", | |
609 | jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); | |
610 | } | |
611 | ||
612 | spin_unlock(&c->erase_completion_lock); | |
613 | ||
31fbdf7a AB |
614 | if (!jffs2_can_mark_obsolete(c) || jffs2_is_readonly(c) || |
615 | (c->flags & JFFS2_SB_FLAG_BUILDING)) { | |
1da177e4 LT |
616 | /* We didn't lock the erase_free_sem */ |
617 | return; | |
618 | } | |
619 | ||
620 | /* The erase_free_sem is locked, and has been since before we marked the node obsolete | |
621 | and potentially put its eraseblock onto the erase_pending_list. Thus, we know that | |
622 | the block hasn't _already_ been erased, and that 'ref' itself hasn't been freed yet | |
623 | by jffs2_free_all_node_refs() in erase.c. Which is nice. */ | |
624 | ||
625 | D1(printk(KERN_DEBUG "obliterating obsoleted node at 0x%08x\n", ref_offset(ref))); | |
626 | ret = jffs2_flash_read(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); | |
627 | if (ret) { | |
628 | printk(KERN_WARNING "Read error reading from obsoleted node at 0x%08x: %d\n", ref_offset(ref), ret); | |
629 | goto out_erase_sem; | |
630 | } | |
631 | if (retlen != sizeof(n)) { | |
632 | printk(KERN_WARNING "Short read from obsoleted node at 0x%08x: %zd\n", ref_offset(ref), retlen); | |
633 | goto out_erase_sem; | |
634 | } | |
635 | if (PAD(je32_to_cpu(n.totlen)) != PAD(ref_totlen(c, jeb, ref))) { | |
636 | printk(KERN_WARNING "Node totlen on flash (0x%08x) != totlen from node ref (0x%08x)\n", je32_to_cpu(n.totlen), ref_totlen(c, jeb, ref)); | |
637 | goto out_erase_sem; | |
638 | } | |
639 | if (!(je16_to_cpu(n.nodetype) & JFFS2_NODE_ACCURATE)) { | |
640 | D1(printk(KERN_DEBUG "Node at 0x%08x was already marked obsolete (nodetype 0x%04x)\n", ref_offset(ref), je16_to_cpu(n.nodetype))); | |
641 | goto out_erase_sem; | |
642 | } | |
643 | /* XXX FIXME: This is ugly now */ | |
644 | n.nodetype = cpu_to_je16(je16_to_cpu(n.nodetype) & ~JFFS2_NODE_ACCURATE); | |
645 | ret = jffs2_flash_write(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); | |
646 | if (ret) { | |
647 | printk(KERN_WARNING "Write error in obliterating obsoleted node at 0x%08x: %d\n", ref_offset(ref), ret); | |
648 | goto out_erase_sem; | |
649 | } | |
650 | if (retlen != sizeof(n)) { | |
651 | printk(KERN_WARNING "Short write in obliterating obsoleted node at 0x%08x: %zd\n", ref_offset(ref), retlen); | |
652 | goto out_erase_sem; | |
653 | } | |
654 | ||
655 | /* Nodes which have been marked obsolete no longer need to be | |
656 | associated with any inode. Remove them from the per-inode list. | |
657 | ||
658 | Note we can't do this for NAND at the moment because we need | |
659 | obsolete dirent nodes to stay on the lists, because of the | |
660 | horridness in jffs2_garbage_collect_deletion_dirent(). Also | |
661 | because we delete the inocache, and on NAND we need that to | |
662 | stay around until all the nodes are actually erased, in order | |
663 | to stop us from giving the same inode number to another newly | |
664 | created inode. */ | |
665 | if (ref->next_in_ino) { | |
666 | struct jffs2_inode_cache *ic; | |
667 | struct jffs2_raw_node_ref **p; | |
668 | ||
669 | spin_lock(&c->erase_completion_lock); | |
670 | ||
671 | ic = jffs2_raw_ref_to_ic(ref); | |
672 | for (p = &ic->nodes; (*p) != ref; p = &((*p)->next_in_ino)) | |
673 | ; | |
674 | ||
675 | *p = ref->next_in_ino; | |
676 | ref->next_in_ino = NULL; | |
677 | ||
437316d9 | 678 | if (ic->nodes == (void *)ic && ic->nlink == 0) |
1da177e4 | 679 | jffs2_del_ino_cache(c, ic); |
1da177e4 LT |
680 | |
681 | spin_unlock(&c->erase_completion_lock); | |
682 | } | |
683 | ||
684 | ||
685 | /* Merge with the next node in the physical list, if there is one | |
686 | and if it's also obsolete and if it doesn't belong to any inode */ | |
687 | if (ref->next_phys && ref_obsolete(ref->next_phys) && | |
688 | !ref->next_phys->next_in_ino) { | |
689 | struct jffs2_raw_node_ref *n = ref->next_phys; | |
690 | ||
691 | spin_lock(&c->erase_completion_lock); | |
692 | ||
693 | ref->__totlen += n->__totlen; | |
694 | ref->next_phys = n->next_phys; | |
695 | if (jeb->last_node == n) jeb->last_node = ref; | |
696 | if (jeb->gc_node == n) { | |
697 | /* gc will be happy continuing gc on this node */ | |
698 | jeb->gc_node=ref; | |
699 | } | |
700 | spin_unlock(&c->erase_completion_lock); | |
701 | ||
702 | jffs2_free_raw_node_ref(n); | |
703 | } | |
704 | ||
705 | /* Also merge with the previous node in the list, if there is one | |
706 | and that one is obsolete */ | |
707 | if (ref != jeb->first_node ) { | |
708 | struct jffs2_raw_node_ref *p = jeb->first_node; | |
709 | ||
710 | spin_lock(&c->erase_completion_lock); | |
711 | ||
712 | while (p->next_phys != ref) | |
713 | p = p->next_phys; | |
714 | ||
715 | if (ref_obsolete(p) && !ref->next_in_ino) { | |
716 | p->__totlen += ref->__totlen; | |
717 | if (jeb->last_node == ref) { | |
718 | jeb->last_node = p; | |
719 | } | |
720 | if (jeb->gc_node == ref) { | |
721 | /* gc will be happy continuing gc on this node */ | |
722 | jeb->gc_node=p; | |
723 | } | |
724 | p->next_phys = ref->next_phys; | |
725 | jffs2_free_raw_node_ref(ref); | |
726 | } | |
727 | spin_unlock(&c->erase_completion_lock); | |
728 | } | |
729 | out_erase_sem: | |
730 | up(&c->erase_free_sem); | |
731 | } | |
732 | ||
1da177e4 LT |
733 | int jffs2_thread_should_wake(struct jffs2_sb_info *c) |
734 | { | |
735 | int ret = 0; | |
736 | uint32_t dirty; | |
737 | ||
738 | if (c->unchecked_size) { | |
739 | D1(printk(KERN_DEBUG "jffs2_thread_should_wake(): unchecked_size %d, checked_ino #%d\n", | |
740 | c->unchecked_size, c->checked_ino)); | |
741 | return 1; | |
742 | } | |
743 | ||
744 | /* dirty_size contains blocks on erase_pending_list | |
745 | * those blocks are counted in c->nr_erasing_blocks. | |
746 | * If one block is actually erased, it is not longer counted as dirty_space | |
747 | * but it is counted in c->nr_erasing_blocks, so we add it and subtract it | |
748 | * with c->nr_erasing_blocks * c->sector_size again. | |
749 | * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks | |
750 | * This helps us to force gc and pick eventually a clean block to spread the load. | |
751 | */ | |
752 | dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size; | |
753 | ||
754 | if (c->nr_free_blocks + c->nr_erasing_blocks < c->resv_blocks_gctrigger && | |
755 | (dirty > c->nospc_dirty_size)) | |
756 | ret = 1; | |
757 | ||
758 | D1(printk(KERN_DEBUG "jffs2_thread_should_wake(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x: %s\n", | |
759 | c->nr_free_blocks, c->nr_erasing_blocks, c->dirty_size, ret?"yes":"no")); | |
760 | ||
761 | return ret; | |
762 | } |