]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
5a528957 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
1da177e4 | 14 | #include <linux/kernel.h> |
1da177e4 LT |
15 | #include <linux/mtd/mtd.h> |
16 | #include <linux/compiler.h> | |
17 | #include <linux/sched.h> /* For cond_resched() */ | |
18 | #include "nodelist.h" | |
e631ddba | 19 | #include "debug.h" |
1da177e4 | 20 | |
8da8ba2e DD |
21 | /* |
22 | * Check whether the user is allowed to write. | |
23 | */ | |
24 | static int jffs2_rp_can_write(struct jffs2_sb_info *c) | |
25 | { | |
26 | uint32_t avail; | |
27 | struct jffs2_mount_opts *opts = &c->mount_opts; | |
28 | ||
29 | avail = c->dirty_size + c->free_size + c->unchecked_size + | |
30 | c->erasing_size - c->resv_blocks_write * c->sector_size | |
31 | - c->nospc_dirty_size; | |
32 | ||
33 | if (avail < 2 * opts->rp_size) | |
34 | jffs2_dbg(1, "rpsize %u, dirty_size %u, free_size %u, " | |
35 | "erasing_size %u, unchecked_size %u, " | |
36 | "nr_erasing_blocks %u, avail %u, resrv %u\n", | |
37 | opts->rp_size, c->dirty_size, c->free_size, | |
38 | c->erasing_size, c->unchecked_size, | |
39 | c->nr_erasing_blocks, avail, c->nospc_dirty_size); | |
40 | ||
41 | if (avail > opts->rp_size) | |
42 | return 1; | |
43 | ||
44 | /* Always allow root */ | |
45 | if (capable(CAP_SYS_RESOURCE)) | |
46 | return 1; | |
47 | ||
48 | jffs2_dbg(1, "forbid writing\n"); | |
49 | return 0; | |
50 | } | |
51 | ||
1da177e4 LT |
52 | /** |
53 | * jffs2_reserve_space - request physical space to write nodes to flash | |
54 | * @c: superblock info | |
55 | * @minsize: Minimum acceptable size of allocation | |
1da177e4 LT |
56 | * @len: Returned value of allocation length |
57 | * @prio: Allocation type - ALLOC_{NORMAL,DELETION} | |
58 | * | |
59 | * Requests a block of physical space on the flash. Returns zero for success | |
9fe4854c DW |
60 | * and puts 'len' into the appropriate place, or returns -ENOSPC or other |
61 | * error if appropriate. Doesn't return len since that's | |
1da177e4 LT |
62 | * |
63 | * If it returns zero, jffs2_reserve_space() also downs the per-filesystem | |
64 | * allocation semaphore, to prevent more than one allocation from being | |
65 | * active at any time. The semaphore is later released by jffs2_commit_allocation() | |
66 | * | |
67 | * jffs2_reserve_space() may trigger garbage collection in order to make room | |
68 | * for the requested allocation. | |
69 | */ | |
70 | ||
e631ddba | 71 | static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, |
9fe4854c | 72 | uint32_t *len, uint32_t sumsize); |
1da177e4 | 73 | |
9fe4854c | 74 | int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, |
e631ddba | 75 | uint32_t *len, int prio, uint32_t sumsize) |
1da177e4 LT |
76 | { |
77 | int ret = -EAGAIN; | |
78 | int blocksneeded = c->resv_blocks_write; | |
79 | /* align it */ | |
80 | minsize = PAD(minsize); | |
81 | ||
9c261b33 | 82 | jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize); |
ced22070 | 83 | mutex_lock(&c->alloc_sem); |
1da177e4 | 84 | |
9c261b33 | 85 | jffs2_dbg(1, "%s(): alloc sem got\n", __func__); |
1da177e4 LT |
86 | |
87 | spin_lock(&c->erase_completion_lock); | |
88 | ||
8da8ba2e DD |
89 | /* |
90 | * Check if the free space is greater then size of the reserved pool. | |
91 | * If not, only allow root to proceed with writing. | |
92 | */ | |
93 | if (prio != ALLOC_DELETION && !jffs2_rp_can_write(c)) { | |
94 | ret = -ENOSPC; | |
95 | goto out; | |
96 | } | |
97 | ||
1da177e4 LT |
98 | /* this needs a little more thought (true <tglx> :)) */ |
99 | while(ret == -EAGAIN) { | |
100 | while(c->nr_free_blocks + c->nr_erasing_blocks < blocksneeded) { | |
1da177e4 LT |
101 | uint32_t dirty, avail; |
102 | ||
103 | /* calculate real dirty size | |
104 | * dirty_size contains blocks on erase_pending_list | |
105 | * those blocks are counted in c->nr_erasing_blocks. | |
106 | * If one block is actually erased, it is not longer counted as dirty_space | |
107 | * but it is counted in c->nr_erasing_blocks, so we add it and subtract it | |
108 | * with c->nr_erasing_blocks * c->sector_size again. | |
109 | * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks | |
110 | * This helps us to force gc and pick eventually a clean block to spread the load. | |
111 | * We add unchecked_size here, as we hopefully will find some space to use. | |
112 | * This will affect the sum only once, as gc first finishes checking | |
113 | * of nodes. | |
114 | */ | |
115 | dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size + c->unchecked_size; | |
116 | if (dirty < c->nospc_dirty_size) { | |
117 | if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { | |
9c261b33 JP |
118 | jffs2_dbg(1, "%s(): Low on dirty space to GC, but it's a deletion. Allowing...\n", |
119 | __func__); | |
1da177e4 LT |
120 | break; |
121 | } | |
9c261b33 JP |
122 | jffs2_dbg(1, "dirty size 0x%08x + unchecked_size 0x%08x < nospc_dirty_size 0x%08x, returning -ENOSPC\n", |
123 | dirty, c->unchecked_size, | |
124 | c->sector_size); | |
1da177e4 LT |
125 | |
126 | spin_unlock(&c->erase_completion_lock); | |
ced22070 | 127 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
128 | return -ENOSPC; |
129 | } | |
182ec4ee | 130 | |
1da177e4 LT |
131 | /* Calc possibly available space. Possibly available means that we |
132 | * don't know, if unchecked size contains obsoleted nodes, which could give us some | |
133 | * more usable space. This will affect the sum only once, as gc first finishes checking | |
134 | * of nodes. | |
182ec4ee | 135 | + Return -ENOSPC, if the maximum possibly available space is less or equal than |
1da177e4 LT |
136 | * blocksneeded * sector_size. |
137 | * This blocks endless gc looping on a filesystem, which is nearly full, even if | |
138 | * the check above passes. | |
139 | */ | |
140 | avail = c->free_size + c->dirty_size + c->erasing_size + c->unchecked_size; | |
141 | if ( (avail / c->sector_size) <= blocksneeded) { | |
142 | if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { | |
9c261b33 JP |
143 | jffs2_dbg(1, "%s(): Low on possibly available space, but it's a deletion. Allowing...\n", |
144 | __func__); | |
1da177e4 LT |
145 | break; |
146 | } | |
147 | ||
9c261b33 JP |
148 | jffs2_dbg(1, "max. available size 0x%08x < blocksneeded * sector_size 0x%08x, returning -ENOSPC\n", |
149 | avail, blocksneeded * c->sector_size); | |
1da177e4 | 150 | spin_unlock(&c->erase_completion_lock); |
ced22070 | 151 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
152 | return -ENOSPC; |
153 | } | |
154 | ||
ced22070 | 155 | mutex_unlock(&c->alloc_sem); |
1da177e4 | 156 | |
9c261b33 JP |
157 | jffs2_dbg(1, "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", |
158 | c->nr_free_blocks, c->nr_erasing_blocks, | |
159 | c->free_size, c->dirty_size, c->wasted_size, | |
160 | c->used_size, c->erasing_size, c->bad_size, | |
161 | c->free_size + c->dirty_size + | |
162 | c->wasted_size + c->used_size + | |
163 | c->erasing_size + c->bad_size, | |
164 | c->flash_size); | |
1da177e4 | 165 | spin_unlock(&c->erase_completion_lock); |
182ec4ee | 166 | |
1da177e4 | 167 | ret = jffs2_garbage_collect_pass(c); |
422b1202 | 168 | |
0717bf84 DW |
169 | if (ret == -EAGAIN) { |
170 | spin_lock(&c->erase_completion_lock); | |
171 | if (c->nr_erasing_blocks && | |
172 | list_empty(&c->erase_pending_list) && | |
173 | list_empty(&c->erase_complete_list)) { | |
174 | DECLARE_WAITQUEUE(wait, current); | |
175 | set_current_state(TASK_UNINTERRUPTIBLE); | |
176 | add_wait_queue(&c->erase_wait, &wait); | |
9c261b33 JP |
177 | jffs2_dbg(1, "%s waiting for erase to complete\n", |
178 | __func__); | |
0717bf84 DW |
179 | spin_unlock(&c->erase_completion_lock); |
180 | ||
181 | schedule(); | |
3ead9578 | 182 | remove_wait_queue(&c->erase_wait, &wait); |
0717bf84 DW |
183 | } else |
184 | spin_unlock(&c->erase_completion_lock); | |
185 | } else if (ret) | |
1da177e4 LT |
186 | return ret; |
187 | ||
188 | cond_resched(); | |
189 | ||
190 | if (signal_pending(current)) | |
191 | return -EINTR; | |
192 | ||
ced22070 | 193 | mutex_lock(&c->alloc_sem); |
1da177e4 LT |
194 | spin_lock(&c->erase_completion_lock); |
195 | } | |
196 | ||
9fe4854c | 197 | ret = jffs2_do_reserve_space(c, minsize, len, sumsize); |
1da177e4 | 198 | if (ret) { |
9c261b33 | 199 | jffs2_dbg(1, "%s(): ret is %d\n", __func__, ret); |
1da177e4 LT |
200 | } |
201 | } | |
8da8ba2e DD |
202 | |
203 | out: | |
1da177e4 | 204 | spin_unlock(&c->erase_completion_lock); |
2f785402 | 205 | if (!ret) |
046b8b98 | 206 | ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); |
1da177e4 | 207 | if (ret) |
ced22070 | 208 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
209 | return ret; |
210 | } | |
211 | ||
9fe4854c DW |
212 | int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, |
213 | uint32_t *len, uint32_t sumsize) | |
1da177e4 | 214 | { |
13b546d9 | 215 | int ret; |
1da177e4 LT |
216 | minsize = PAD(minsize); |
217 | ||
9c261b33 | 218 | jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize); |
1da177e4 | 219 | |
13b546d9 LZ |
220 | while (true) { |
221 | spin_lock(&c->erase_completion_lock); | |
9fe4854c | 222 | ret = jffs2_do_reserve_space(c, minsize, len, sumsize); |
1da177e4 | 223 | if (ret) { |
9c261b33 JP |
224 | jffs2_dbg(1, "%s(): looping, ret is %d\n", |
225 | __func__, ret); | |
1da177e4 | 226 | } |
13b546d9 LZ |
227 | spin_unlock(&c->erase_completion_lock); |
228 | ||
229 | if (ret == -EAGAIN) | |
230 | cond_resched(); | |
231 | else | |
232 | break; | |
1da177e4 | 233 | } |
2f785402 | 234 | if (!ret) |
046b8b98 | 235 | ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); |
2f785402 | 236 | |
1da177e4 LT |
237 | return ret; |
238 | } | |
239 | ||
e631ddba FH |
240 | |
241 | /* Classify nextblock (clean, dirty of verydirty) and force to select an other one */ | |
242 | ||
243 | static void jffs2_close_nextblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) | |
1da177e4 | 244 | { |
e631ddba | 245 | |
99c2594f | 246 | if (c->nextblock == NULL) { |
9c261b33 JP |
247 | jffs2_dbg(1, "%s(): Erase block at 0x%08x has already been placed in a list\n", |
248 | __func__, jeb->offset); | |
99c2594f AH |
249 | return; |
250 | } | |
e631ddba FH |
251 | /* Check, if we have a dirty block now, or if it was dirty already */ |
252 | if (ISDIRTY (jeb->wasted_size + jeb->dirty_size)) { | |
253 | c->dirty_size += jeb->wasted_size; | |
254 | c->wasted_size -= jeb->wasted_size; | |
255 | jeb->dirty_size += jeb->wasted_size; | |
256 | jeb->wasted_size = 0; | |
257 | if (VERYDIRTY(c, jeb->dirty_size)) { | |
9c261b33 JP |
258 | jffs2_dbg(1, "Adding full erase block at 0x%08x to very_dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", |
259 | jeb->offset, jeb->free_size, jeb->dirty_size, | |
260 | jeb->used_size); | |
e631ddba FH |
261 | list_add_tail(&jeb->list, &c->very_dirty_list); |
262 | } else { | |
9c261b33 JP |
263 | jffs2_dbg(1, "Adding full erase block at 0x%08x to dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", |
264 | jeb->offset, jeb->free_size, jeb->dirty_size, | |
265 | jeb->used_size); | |
e631ddba FH |
266 | list_add_tail(&jeb->list, &c->dirty_list); |
267 | } | |
182ec4ee | 268 | } else { |
9c261b33 JP |
269 | jffs2_dbg(1, "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", |
270 | jeb->offset, jeb->free_size, jeb->dirty_size, | |
271 | jeb->used_size); | |
e631ddba FH |
272 | list_add_tail(&jeb->list, &c->clean_list); |
273 | } | |
274 | c->nextblock = NULL; | |
275 | ||
276 | } | |
277 | ||
278 | /* Select a new jeb for nextblock */ | |
279 | ||
280 | static int jffs2_find_nextblock(struct jffs2_sb_info *c) | |
281 | { | |
282 | struct list_head *next; | |
182ec4ee | 283 | |
e631ddba FH |
284 | /* Take the next block off the 'free' list */ |
285 | ||
286 | if (list_empty(&c->free_list)) { | |
287 | ||
288 | if (!c->nr_erasing_blocks && | |
289 | !list_empty(&c->erasable_list)) { | |
290 | struct jffs2_eraseblock *ejeb; | |
291 | ||
292 | ejeb = list_entry(c->erasable_list.next, struct jffs2_eraseblock, list); | |
f116629d | 293 | list_move_tail(&ejeb->list, &c->erase_pending_list); |
e631ddba | 294 | c->nr_erasing_blocks++; |
ae3b6ba0 | 295 | jffs2_garbage_collect_trigger(c); |
9c261b33 JP |
296 | jffs2_dbg(1, "%s(): Triggering erase of erasable block at 0x%08x\n", |
297 | __func__, ejeb->offset); | |
e631ddba FH |
298 | } |
299 | ||
300 | if (!c->nr_erasing_blocks && | |
301 | !list_empty(&c->erasable_pending_wbuf_list)) { | |
9c261b33 JP |
302 | jffs2_dbg(1, "%s(): Flushing write buffer\n", |
303 | __func__); | |
e631ddba | 304 | /* c->nextblock is NULL, no update to c->nextblock allowed */ |
1da177e4 | 305 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
306 | jffs2_flush_wbuf_pad(c); |
307 | spin_lock(&c->erase_completion_lock); | |
e631ddba FH |
308 | /* Have another go. It'll be on the erasable_list now */ |
309 | return -EAGAIN; | |
1da177e4 | 310 | } |
e631ddba FH |
311 | |
312 | if (!c->nr_erasing_blocks) { | |
313 | /* Ouch. We're in GC, or we wouldn't have got here. | |
314 | And there's no space left. At all. */ | |
da320f05 JP |
315 | pr_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", |
316 | c->nr_erasing_blocks, c->nr_free_blocks, | |
317 | list_empty(&c->erasable_list) ? "yes" : "no", | |
318 | list_empty(&c->erasing_list) ? "yes" : "no", | |
319 | list_empty(&c->erase_pending_list) ? "yes" : "no"); | |
e631ddba | 320 | return -ENOSPC; |
1da177e4 | 321 | } |
e631ddba FH |
322 | |
323 | spin_unlock(&c->erase_completion_lock); | |
324 | /* Don't wait for it; just erase one right now */ | |
325 | jffs2_erase_pending_blocks(c, 1); | |
326 | spin_lock(&c->erase_completion_lock); | |
327 | ||
328 | /* An erase may have failed, decreasing the | |
329 | amount of free space available. So we must | |
330 | restart from the beginning */ | |
331 | return -EAGAIN; | |
1da177e4 | 332 | } |
e631ddba FH |
333 | |
334 | next = c->free_list.next; | |
335 | list_del(next); | |
336 | c->nextblock = list_entry(next, struct jffs2_eraseblock, list); | |
337 | c->nr_free_blocks--; | |
182ec4ee | 338 | |
e631ddba FH |
339 | jffs2_sum_reset_collected(c->summary); /* reset collected summary */ |
340 | ||
f04de505 | 341 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
5bf17237 AB |
342 | /* adjust write buffer offset, else we get a non contiguous write bug */ |
343 | if (!(c->wbuf_ofs % c->sector_size) && !c->wbuf_len) | |
344 | c->wbuf_ofs = 0xffffffff; | |
f04de505 | 345 | #endif |
5bf17237 | 346 | |
9c261b33 JP |
347 | jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n", |
348 | __func__, c->nextblock->offset); | |
e631ddba FH |
349 | |
350 | return 0; | |
351 | } | |
352 | ||
353 | /* Called with alloc sem _and_ erase_completion_lock */ | |
9fe4854c DW |
354 | static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, |
355 | uint32_t *len, uint32_t sumsize) | |
e631ddba FH |
356 | { |
357 | struct jffs2_eraseblock *jeb = c->nextblock; | |
9fe4854c | 358 | uint32_t reserved_size; /* for summary information at the end of the jeb */ |
e631ddba FH |
359 | int ret; |
360 | ||
361 | restart: | |
362 | reserved_size = 0; | |
363 | ||
364 | if (jffs2_sum_active() && (sumsize != JFFS2_SUMMARY_NOSUM_SIZE)) { | |
365 | /* NOSUM_SIZE means not to generate summary */ | |
366 | ||
367 | if (jeb) { | |
368 | reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE); | |
733802d9 | 369 | dbg_summary("minsize=%d , jeb->free=%d ," |
e631ddba FH |
370 | "summary->size=%d , sumsize=%d\n", |
371 | minsize, jeb->free_size, | |
372 | c->summary->sum_size, sumsize); | |
373 | } | |
374 | ||
375 | /* Is there enough space for writing out the current node, or we have to | |
376 | write out summary information now, close this jeb and select new nextblock? */ | |
377 | if (jeb && (PAD(minsize) + PAD(c->summary->sum_size + sumsize + | |
378 | JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size)) { | |
379 | ||
380 | /* Has summary been disabled for this jeb? */ | |
381 | if (jffs2_sum_is_disabled(c->summary)) { | |
382 | sumsize = JFFS2_SUMMARY_NOSUM_SIZE; | |
383 | goto restart; | |
1da177e4 LT |
384 | } |
385 | ||
e631ddba | 386 | /* Writing out the collected summary information */ |
733802d9 | 387 | dbg_summary("generating summary for 0x%08x.\n", jeb->offset); |
e631ddba FH |
388 | ret = jffs2_sum_write_sumnode(c); |
389 | ||
390 | if (ret) | |
391 | return ret; | |
392 | ||
393 | if (jffs2_sum_is_disabled(c->summary)) { | |
394 | /* jffs2_write_sumnode() couldn't write out the summary information | |
395 | diabling summary for this jeb and free the collected information | |
396 | */ | |
397 | sumsize = JFFS2_SUMMARY_NOSUM_SIZE; | |
398 | goto restart; | |
399 | } | |
400 | ||
401 | jffs2_close_nextblock(c, jeb); | |
402 | jeb = NULL; | |
34c0e906 FH |
403 | /* keep always valid value in reserved_size */ |
404 | reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE); | |
e631ddba FH |
405 | } |
406 | } else { | |
407 | if (jeb && minsize > jeb->free_size) { | |
fc6612f6 DW |
408 | uint32_t waste; |
409 | ||
e631ddba FH |
410 | /* Skip the end of this block and file it as having some dirty space */ |
411 | /* If there's a pending write to it, flush now */ | |
412 | ||
413 | if (jffs2_wbuf_dirty(c)) { | |
1da177e4 | 414 | spin_unlock(&c->erase_completion_lock); |
9c261b33 JP |
415 | jffs2_dbg(1, "%s(): Flushing write buffer\n", |
416 | __func__); | |
1da177e4 LT |
417 | jffs2_flush_wbuf_pad(c); |
418 | spin_lock(&c->erase_completion_lock); | |
e631ddba FH |
419 | jeb = c->nextblock; |
420 | goto restart; | |
1da177e4 LT |
421 | } |
422 | ||
fc6612f6 DW |
423 | spin_unlock(&c->erase_completion_lock); |
424 | ||
425 | ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); | |
2cbba75a | 426 | |
fc6612f6 DW |
427 | /* Just lock it again and continue. Nothing much can change because |
428 | we hold c->alloc_sem anyway. In fact, it's not entirely clear why | |
429 | we hold c->erase_completion_lock in the majority of this function... | |
430 | but that's a question for another (more caffeine-rich) day. */ | |
431 | spin_lock(&c->erase_completion_lock); | |
432 | ||
2cbba75a AK |
433 | if (ret) |
434 | return ret; | |
435 | ||
fc6612f6 DW |
436 | waste = jeb->free_size; |
437 | jffs2_link_node_ref(c, jeb, | |
438 | (jeb->offset + c->sector_size - waste) | REF_OBSOLETE, | |
439 | waste, NULL); | |
440 | /* FIXME: that made it count as dirty. Convert to wasted */ | |
441 | jeb->dirty_size -= waste; | |
442 | c->dirty_size -= waste; | |
443 | jeb->wasted_size += waste; | |
444 | c->wasted_size += waste; | |
1da177e4 | 445 | |
e631ddba FH |
446 | jffs2_close_nextblock(c, jeb); |
447 | jeb = NULL; | |
1da177e4 | 448 | } |
e631ddba FH |
449 | } |
450 | ||
451 | if (!jeb) { | |
452 | ||
453 | ret = jffs2_find_nextblock(c); | |
454 | if (ret) | |
455 | return ret; | |
1da177e4 | 456 | |
e631ddba | 457 | jeb = c->nextblock; |
1da177e4 LT |
458 | |
459 | if (jeb->free_size != c->sector_size - c->cleanmarker_size) { | |
da320f05 JP |
460 | pr_warn("Eep. Block 0x%08x taken from free_list had free_size of 0x%08x!!\n", |
461 | jeb->offset, jeb->free_size); | |
1da177e4 LT |
462 | goto restart; |
463 | } | |
464 | } | |
465 | /* OK, jeb (==c->nextblock) is now pointing at a block which definitely has | |
466 | enough space */ | |
e631ddba | 467 | *len = jeb->free_size - reserved_size; |
1da177e4 LT |
468 | |
469 | if (c->cleanmarker_size && jeb->used_size == c->cleanmarker_size && | |
470 | !jeb->first_node->next_in_ino) { | |
182ec4ee | 471 | /* Only node in it beforehand was a CLEANMARKER node (we think). |
1da177e4 | 472 | So mark it obsolete now that there's going to be another node |
182ec4ee | 473 | in the block. This will reduce used_size to zero but We've |
1da177e4 LT |
474 | already set c->nextblock so that jffs2_mark_node_obsolete() |
475 | won't try to refile it to the dirty_list. | |
476 | */ | |
477 | spin_unlock(&c->erase_completion_lock); | |
478 | jffs2_mark_node_obsolete(c, jeb->first_node); | |
479 | spin_lock(&c->erase_completion_lock); | |
480 | } | |
481 | ||
9c261b33 JP |
482 | jffs2_dbg(1, "%s(): Giving 0x%x bytes at 0x%x\n", |
483 | __func__, | |
484 | *len, jeb->offset + (c->sector_size - jeb->free_size)); | |
1da177e4 LT |
485 | return 0; |
486 | } | |
487 | ||
488 | /** | |
489 | * jffs2_add_physical_node_ref - add a physical node reference to the list | |
490 | * @c: superblock info | |
491 | * @new: new node reference to add | |
492 | * @len: length of this physical node | |
1da177e4 | 493 | * |
182ec4ee | 494 | * Should only be used to report nodes for which space has been allocated |
1da177e4 LT |
495 | * by jffs2_reserve_space. |
496 | * | |
497 | * Must be called with the alloc_sem held. | |
498 | */ | |
182ec4ee | 499 | |
2f785402 DW |
500 | struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c, |
501 | uint32_t ofs, uint32_t len, | |
502 | struct jffs2_inode_cache *ic) | |
1da177e4 LT |
503 | { |
504 | struct jffs2_eraseblock *jeb; | |
2f785402 | 505 | struct jffs2_raw_node_ref *new; |
1da177e4 | 506 | |
2f785402 | 507 | jeb = &c->blocks[ofs / c->sector_size]; |
1da177e4 | 508 | |
9c261b33 JP |
509 | jffs2_dbg(1, "%s(): Node at 0x%x(%d), size 0x%x\n", |
510 | __func__, ofs & ~3, ofs & 3, len); | |
1da177e4 | 511 | #if 1 |
2f785402 DW |
512 | /* Allow non-obsolete nodes only to be added at the end of c->nextblock, |
513 | if c->nextblock is set. Note that wbuf.c will file obsolete nodes | |
514 | even after refiling c->nextblock */ | |
515 | if ((c->nextblock || ((ofs & 3) != REF_OBSOLETE)) | |
516 | && (jeb != c->nextblock || (ofs & ~3) != jeb->offset + (c->sector_size - jeb->free_size))) { | |
da320f05 JP |
517 | pr_warn("argh. node added in wrong place at 0x%08x(%d)\n", |
518 | ofs & ~3, ofs & 3); | |
66bfaeaa | 519 | if (c->nextblock) |
da320f05 | 520 | pr_warn("nextblock 0x%08x", c->nextblock->offset); |
66bfaeaa | 521 | else |
da320f05 JP |
522 | pr_warn("No nextblock"); |
523 | pr_cont(", expected at %08x\n", | |
524 | jeb->offset + (c->sector_size - jeb->free_size)); | |
2f785402 | 525 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
526 | } |
527 | #endif | |
528 | spin_lock(&c->erase_completion_lock); | |
529 | ||
2f785402 | 530 | new = jffs2_link_node_ref(c, jeb, ofs, len, ic); |
1da177e4 | 531 | |
9b88f473 | 532 | if (!jeb->free_size && !jeb->dirty_size && !ISDIRTY(jeb->wasted_size)) { |
1da177e4 | 533 | /* If it lives on the dirty_list, jffs2_reserve_space will put it there */ |
9c261b33 JP |
534 | jffs2_dbg(1, "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", |
535 | jeb->offset, jeb->free_size, jeb->dirty_size, | |
536 | jeb->used_size); | |
1da177e4 LT |
537 | if (jffs2_wbuf_dirty(c)) { |
538 | /* Flush the last write in the block if it's outstanding */ | |
539 | spin_unlock(&c->erase_completion_lock); | |
540 | jffs2_flush_wbuf_pad(c); | |
541 | spin_lock(&c->erase_completion_lock); | |
542 | } | |
543 | ||
544 | list_add_tail(&jeb->list, &c->clean_list); | |
545 | c->nextblock = NULL; | |
546 | } | |
e0c8e42f AB |
547 | jffs2_dbg_acct_sanity_check_nolock(c,jeb); |
548 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); | |
1da177e4 LT |
549 | |
550 | spin_unlock(&c->erase_completion_lock); | |
551 | ||
2f785402 | 552 | return new; |
1da177e4 LT |
553 | } |
554 | ||
555 | ||
556 | void jffs2_complete_reservation(struct jffs2_sb_info *c) | |
557 | { | |
9c261b33 | 558 | jffs2_dbg(1, "jffs2_complete_reservation()\n"); |
acb64a43 | 559 | spin_lock(&c->erase_completion_lock); |
1da177e4 | 560 | jffs2_garbage_collect_trigger(c); |
acb64a43 | 561 | spin_unlock(&c->erase_completion_lock); |
ced22070 | 562 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
563 | } |
564 | ||
565 | static inline int on_list(struct list_head *obj, struct list_head *head) | |
566 | { | |
567 | struct list_head *this; | |
568 | ||
569 | list_for_each(this, head) { | |
570 | if (this == obj) { | |
9c261b33 | 571 | jffs2_dbg(1, "%p is on list at %p\n", obj, head); |
1da177e4 LT |
572 | return 1; |
573 | ||
574 | } | |
575 | } | |
576 | return 0; | |
577 | } | |
578 | ||
579 | void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref) | |
580 | { | |
581 | struct jffs2_eraseblock *jeb; | |
582 | int blocknr; | |
583 | struct jffs2_unknown_node n; | |
584 | int ret, addedsize; | |
585 | size_t retlen; | |
1417fc44 | 586 | uint32_t freed_len; |
1da177e4 | 587 | |
9bfeb691 | 588 | if(unlikely(!ref)) { |
da320f05 | 589 | pr_notice("EEEEEK. jffs2_mark_node_obsolete called with NULL node\n"); |
1da177e4 LT |
590 | return; |
591 | } | |
592 | if (ref_obsolete(ref)) { | |
9c261b33 JP |
593 | jffs2_dbg(1, "%s(): called with already obsolete node at 0x%08x\n", |
594 | __func__, ref_offset(ref)); | |
1da177e4 LT |
595 | return; |
596 | } | |
597 | blocknr = ref->flash_offset / c->sector_size; | |
598 | if (blocknr >= c->nr_blocks) { | |
da320f05 JP |
599 | pr_notice("raw node at 0x%08x is off the end of device!\n", |
600 | ref->flash_offset); | |
1da177e4 LT |
601 | BUG(); |
602 | } | |
603 | jeb = &c->blocks[blocknr]; | |
604 | ||
605 | if (jffs2_can_mark_obsolete(c) && !jffs2_is_readonly(c) && | |
31fbdf7a | 606 | !(c->flags & (JFFS2_SB_FLAG_SCANNING | JFFS2_SB_FLAG_BUILDING))) { |
182ec4ee TG |
607 | /* Hm. This may confuse static lock analysis. If any of the above |
608 | three conditions is false, we're going to return from this | |
1da177e4 LT |
609 | function without actually obliterating any nodes or freeing |
610 | any jffs2_raw_node_refs. So we don't need to stop erases from | |
611 | happening, or protect against people holding an obsolete | |
612 | jffs2_raw_node_ref without the erase_completion_lock. */ | |
ced22070 | 613 | mutex_lock(&c->erase_free_sem); |
1da177e4 LT |
614 | } |
615 | ||
616 | spin_lock(&c->erase_completion_lock); | |
617 | ||
1417fc44 DW |
618 | freed_len = ref_totlen(c, jeb, ref); |
619 | ||
1da177e4 | 620 | if (ref_flags(ref) == REF_UNCHECKED) { |
1417fc44 | 621 | D1(if (unlikely(jeb->unchecked_size < freed_len)) { |
da320f05 JP |
622 | pr_notice("raw unchecked node of size 0x%08x freed from erase block %d at 0x%08x, but unchecked_size was already 0x%08x\n", |
623 | freed_len, blocknr, | |
624 | ref->flash_offset, jeb->used_size); | |
1da177e4 LT |
625 | BUG(); |
626 | }) | |
9c261b33 JP |
627 | jffs2_dbg(1, "Obsoleting previously unchecked node at 0x%08x of len %x\n", |
628 | ref_offset(ref), freed_len); | |
1417fc44 DW |
629 | jeb->unchecked_size -= freed_len; |
630 | c->unchecked_size -= freed_len; | |
1da177e4 | 631 | } else { |
1417fc44 | 632 | D1(if (unlikely(jeb->used_size < freed_len)) { |
da320f05 JP |
633 | pr_notice("raw node of size 0x%08x freed from erase block %d at 0x%08x, but used_size was already 0x%08x\n", |
634 | freed_len, blocknr, | |
635 | ref->flash_offset, jeb->used_size); | |
1da177e4 LT |
636 | BUG(); |
637 | }) | |
9c261b33 JP |
638 | jffs2_dbg(1, "Obsoleting node at 0x%08x of len %#x: ", |
639 | ref_offset(ref), freed_len); | |
1417fc44 DW |
640 | jeb->used_size -= freed_len; |
641 | c->used_size -= freed_len; | |
1da177e4 LT |
642 | } |
643 | ||
644 | // Take care, that wasted size is taken into concern | |
1417fc44 | 645 | if ((jeb->dirty_size || ISDIRTY(jeb->wasted_size + freed_len)) && jeb != c->nextblock) { |
9c261b33 | 646 | jffs2_dbg(1, "Dirtying\n"); |
1417fc44 DW |
647 | addedsize = freed_len; |
648 | jeb->dirty_size += freed_len; | |
649 | c->dirty_size += freed_len; | |
1da177e4 LT |
650 | |
651 | /* Convert wasted space to dirty, if not a bad block */ | |
652 | if (jeb->wasted_size) { | |
653 | if (on_list(&jeb->list, &c->bad_used_list)) { | |
9c261b33 JP |
654 | jffs2_dbg(1, "Leaving block at %08x on the bad_used_list\n", |
655 | jeb->offset); | |
1da177e4 LT |
656 | addedsize = 0; /* To fool the refiling code later */ |
657 | } else { | |
9c261b33 JP |
658 | jffs2_dbg(1, "Converting %d bytes of wasted space to dirty in block at %08x\n", |
659 | jeb->wasted_size, jeb->offset); | |
1da177e4 LT |
660 | addedsize += jeb->wasted_size; |
661 | jeb->dirty_size += jeb->wasted_size; | |
662 | c->dirty_size += jeb->wasted_size; | |
663 | c->wasted_size -= jeb->wasted_size; | |
664 | jeb->wasted_size = 0; | |
665 | } | |
666 | } | |
667 | } else { | |
9c261b33 | 668 | jffs2_dbg(1, "Wasting\n"); |
1da177e4 | 669 | addedsize = 0; |
1417fc44 DW |
670 | jeb->wasted_size += freed_len; |
671 | c->wasted_size += freed_len; | |
1da177e4 LT |
672 | } |
673 | ref->flash_offset = ref_offset(ref) | REF_OBSOLETE; | |
182ec4ee | 674 | |
e0c8e42f AB |
675 | jffs2_dbg_acct_sanity_check_nolock(c, jeb); |
676 | jffs2_dbg_acct_paranoia_check_nolock(c, jeb); | |
1da177e4 | 677 | |
31fbdf7a AB |
678 | if (c->flags & JFFS2_SB_FLAG_SCANNING) { |
679 | /* Flash scanning is in progress. Don't muck about with the block | |
1da177e4 | 680 | lists because they're not ready yet, and don't actually |
182ec4ee | 681 | obliterate nodes that look obsolete. If they weren't |
1da177e4 LT |
682 | marked obsolete on the flash at the time they _became_ |
683 | obsolete, there was probably a reason for that. */ | |
684 | spin_unlock(&c->erase_completion_lock); | |
685 | /* We didn't lock the erase_free_sem */ | |
686 | return; | |
687 | } | |
688 | ||
689 | if (jeb == c->nextblock) { | |
9c261b33 JP |
690 | jffs2_dbg(2, "Not moving nextblock 0x%08x to dirty/erase_pending list\n", |
691 | jeb->offset); | |
1da177e4 LT |
692 | } else if (!jeb->used_size && !jeb->unchecked_size) { |
693 | if (jeb == c->gcblock) { | |
9c261b33 JP |
694 | jffs2_dbg(1, "gcblock at 0x%08x completely dirtied. Clearing gcblock...\n", |
695 | jeb->offset); | |
1da177e4 LT |
696 | c->gcblock = NULL; |
697 | } else { | |
9c261b33 JP |
698 | jffs2_dbg(1, "Eraseblock at 0x%08x completely dirtied. Removing from (dirty?) list...\n", |
699 | jeb->offset); | |
1da177e4 LT |
700 | list_del(&jeb->list); |
701 | } | |
702 | if (jffs2_wbuf_dirty(c)) { | |
9c261b33 | 703 | jffs2_dbg(1, "...and adding to erasable_pending_wbuf_list\n"); |
1da177e4 LT |
704 | list_add_tail(&jeb->list, &c->erasable_pending_wbuf_list); |
705 | } else { | |
706 | if (jiffies & 127) { | |
707 | /* Most of the time, we just erase it immediately. Otherwise we | |
708 | spend ages scanning it on mount, etc. */ | |
9c261b33 | 709 | jffs2_dbg(1, "...and adding to erase_pending_list\n"); |
1da177e4 LT |
710 | list_add_tail(&jeb->list, &c->erase_pending_list); |
711 | c->nr_erasing_blocks++; | |
ae3b6ba0 | 712 | jffs2_garbage_collect_trigger(c); |
1da177e4 LT |
713 | } else { |
714 | /* Sometimes, however, we leave it elsewhere so it doesn't get | |
715 | immediately reused, and we spread the load a bit. */ | |
9c261b33 | 716 | jffs2_dbg(1, "...and adding to erasable_list\n"); |
1da177e4 | 717 | list_add_tail(&jeb->list, &c->erasable_list); |
182ec4ee | 718 | } |
1da177e4 | 719 | } |
9c261b33 | 720 | jffs2_dbg(1, "Done OK\n"); |
1da177e4 | 721 | } else if (jeb == c->gcblock) { |
9c261b33 JP |
722 | jffs2_dbg(2, "Not moving gcblock 0x%08x to dirty_list\n", |
723 | jeb->offset); | |
1da177e4 | 724 | } else if (ISDIRTY(jeb->dirty_size) && !ISDIRTY(jeb->dirty_size - addedsize)) { |
9c261b33 JP |
725 | jffs2_dbg(1, "Eraseblock at 0x%08x is freshly dirtied. Removing from clean list...\n", |
726 | jeb->offset); | |
1da177e4 | 727 | list_del(&jeb->list); |
9c261b33 | 728 | jffs2_dbg(1, "...and adding to dirty_list\n"); |
1da177e4 LT |
729 | list_add_tail(&jeb->list, &c->dirty_list); |
730 | } else if (VERYDIRTY(c, jeb->dirty_size) && | |
731 | !VERYDIRTY(c, jeb->dirty_size - addedsize)) { | |
9c261b33 JP |
732 | jffs2_dbg(1, "Eraseblock at 0x%08x is now very dirty. Removing from dirty list...\n", |
733 | jeb->offset); | |
1da177e4 | 734 | list_del(&jeb->list); |
9c261b33 | 735 | jffs2_dbg(1, "...and adding to very_dirty_list\n"); |
1da177e4 LT |
736 | list_add_tail(&jeb->list, &c->very_dirty_list); |
737 | } else { | |
9c261b33 JP |
738 | jffs2_dbg(1, "Eraseblock at 0x%08x not moved anywhere. (free 0x%08x, dirty 0x%08x, used 0x%08x)\n", |
739 | jeb->offset, jeb->free_size, jeb->dirty_size, | |
740 | jeb->used_size); | |
182ec4ee | 741 | } |
1da177e4 LT |
742 | |
743 | spin_unlock(&c->erase_completion_lock); | |
744 | ||
31fbdf7a AB |
745 | if (!jffs2_can_mark_obsolete(c) || jffs2_is_readonly(c) || |
746 | (c->flags & JFFS2_SB_FLAG_BUILDING)) { | |
1da177e4 LT |
747 | /* We didn't lock the erase_free_sem */ |
748 | return; | |
749 | } | |
750 | ||
751 | /* The erase_free_sem is locked, and has been since before we marked the node obsolete | |
752 | and potentially put its eraseblock onto the erase_pending_list. Thus, we know that | |
753 | the block hasn't _already_ been erased, and that 'ref' itself hasn't been freed yet | |
c38c1b61 | 754 | by jffs2_free_jeb_node_refs() in erase.c. Which is nice. */ |
1da177e4 | 755 | |
9c261b33 JP |
756 | jffs2_dbg(1, "obliterating obsoleted node at 0x%08x\n", |
757 | ref_offset(ref)); | |
1da177e4 LT |
758 | ret = jffs2_flash_read(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); |
759 | if (ret) { | |
da320f05 JP |
760 | pr_warn("Read error reading from obsoleted node at 0x%08x: %d\n", |
761 | ref_offset(ref), ret); | |
1da177e4 LT |
762 | goto out_erase_sem; |
763 | } | |
764 | if (retlen != sizeof(n)) { | |
da320f05 JP |
765 | pr_warn("Short read from obsoleted node at 0x%08x: %zd\n", |
766 | ref_offset(ref), retlen); | |
1da177e4 LT |
767 | goto out_erase_sem; |
768 | } | |
1417fc44 | 769 | if (PAD(je32_to_cpu(n.totlen)) != PAD(freed_len)) { |
da320f05 JP |
770 | pr_warn("Node totlen on flash (0x%08x) != totlen from node ref (0x%08x)\n", |
771 | je32_to_cpu(n.totlen), freed_len); | |
1da177e4 LT |
772 | goto out_erase_sem; |
773 | } | |
774 | if (!(je16_to_cpu(n.nodetype) & JFFS2_NODE_ACCURATE)) { | |
9c261b33 JP |
775 | jffs2_dbg(1, "Node at 0x%08x was already marked obsolete (nodetype 0x%04x)\n", |
776 | ref_offset(ref), je16_to_cpu(n.nodetype)); | |
1da177e4 LT |
777 | goto out_erase_sem; |
778 | } | |
779 | /* XXX FIXME: This is ugly now */ | |
780 | n.nodetype = cpu_to_je16(je16_to_cpu(n.nodetype) & ~JFFS2_NODE_ACCURATE); | |
781 | ret = jffs2_flash_write(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); | |
782 | if (ret) { | |
da320f05 JP |
783 | pr_warn("Write error in obliterating obsoleted node at 0x%08x: %d\n", |
784 | ref_offset(ref), ret); | |
1da177e4 LT |
785 | goto out_erase_sem; |
786 | } | |
787 | if (retlen != sizeof(n)) { | |
da320f05 JP |
788 | pr_warn("Short write in obliterating obsoleted node at 0x%08x: %zd\n", |
789 | ref_offset(ref), retlen); | |
1da177e4 LT |
790 | goto out_erase_sem; |
791 | } | |
792 | ||
793 | /* Nodes which have been marked obsolete no longer need to be | |
794 | associated with any inode. Remove them from the per-inode list. | |
182ec4ee TG |
795 | |
796 | Note we can't do this for NAND at the moment because we need | |
1da177e4 LT |
797 | obsolete dirent nodes to stay on the lists, because of the |
798 | horridness in jffs2_garbage_collect_deletion_dirent(). Also | |
182ec4ee | 799 | because we delete the inocache, and on NAND we need that to |
1da177e4 LT |
800 | stay around until all the nodes are actually erased, in order |
801 | to stop us from giving the same inode number to another newly | |
802 | created inode. */ | |
803 | if (ref->next_in_ino) { | |
804 | struct jffs2_inode_cache *ic; | |
805 | struct jffs2_raw_node_ref **p; | |
806 | ||
807 | spin_lock(&c->erase_completion_lock); | |
808 | ||
809 | ic = jffs2_raw_ref_to_ic(ref); | |
810 | for (p = &ic->nodes; (*p) != ref; p = &((*p)->next_in_ino)) | |
811 | ; | |
812 | ||
813 | *p = ref->next_in_ino; | |
814 | ref->next_in_ino = NULL; | |
815 | ||
c9f700f8 KK |
816 | switch (ic->class) { |
817 | #ifdef CONFIG_JFFS2_FS_XATTR | |
818 | case RAWNODE_CLASS_XATTR_DATUM: | |
819 | jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic); | |
820 | break; | |
821 | case RAWNODE_CLASS_XATTR_REF: | |
822 | jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic); | |
823 | break; | |
824 | #endif | |
825 | default: | |
27c72b04 | 826 | if (ic->nodes == (void *)ic && ic->pino_nlink == 0) |
c9f700f8 KK |
827 | jffs2_del_ino_cache(c, ic); |
828 | break; | |
829 | } | |
1da177e4 LT |
830 | spin_unlock(&c->erase_completion_lock); |
831 | } | |
832 | ||
1da177e4 | 833 | out_erase_sem: |
ced22070 | 834 | mutex_unlock(&c->erase_free_sem); |
1da177e4 LT |
835 | } |
836 | ||
1da177e4 LT |
837 | int jffs2_thread_should_wake(struct jffs2_sb_info *c) |
838 | { | |
839 | int ret = 0; | |
840 | uint32_t dirty; | |
8fb870df DW |
841 | int nr_very_dirty = 0; |
842 | struct jffs2_eraseblock *jeb; | |
1da177e4 | 843 | |
d6ce1710 JT |
844 | if (!list_empty(&c->erase_complete_list) || |
845 | !list_empty(&c->erase_pending_list)) | |
846 | return 1; | |
847 | ||
1da177e4 | 848 | if (c->unchecked_size) { |
5817b9dc DW |
849 | jffs2_dbg(1, "jffs2_thread_should_wake(): unchecked_size %d, check_ino #%d\n", |
850 | c->unchecked_size, c->check_ino); | |
1da177e4 LT |
851 | return 1; |
852 | } | |
853 | ||
854 | /* dirty_size contains blocks on erase_pending_list | |
855 | * those blocks are counted in c->nr_erasing_blocks. | |
856 | * If one block is actually erased, it is not longer counted as dirty_space | |
857 | * but it is counted in c->nr_erasing_blocks, so we add it and subtract it | |
858 | * with c->nr_erasing_blocks * c->sector_size again. | |
859 | * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks | |
860 | * This helps us to force gc and pick eventually a clean block to spread the load. | |
861 | */ | |
862 | dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size; | |
863 | ||
182ec4ee TG |
864 | if (c->nr_free_blocks + c->nr_erasing_blocks < c->resv_blocks_gctrigger && |
865 | (dirty > c->nospc_dirty_size)) | |
1da177e4 LT |
866 | ret = 1; |
867 | ||
8fb870df DW |
868 | list_for_each_entry(jeb, &c->very_dirty_list, list) { |
869 | nr_very_dirty++; | |
870 | if (nr_very_dirty == c->vdirty_blocks_gctrigger) { | |
871 | ret = 1; | |
a8c68f32 DW |
872 | /* In debug mode, actually go through and count them all */ |
873 | D1(continue); | |
874 | break; | |
8fb870df DW |
875 | } |
876 | } | |
877 | ||
9c261b33 JP |
878 | jffs2_dbg(1, "%s(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x, vdirty_blocks %d: %s\n", |
879 | __func__, c->nr_free_blocks, c->nr_erasing_blocks, | |
880 | c->dirty_size, nr_very_dirty, ret ? "yes" : "no"); | |
1da177e4 LT |
881 | |
882 | return ret; | |
883 | } |