11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001-2003 Red Hat, Inc. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Created by David Woodhouse <dwmw2@infradead.org> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * For licensing information, see the file 'LICENCE' in this directory. 91da177e4SLinus Torvalds * 10733802d9SArtem B. Bityutskiy * $Id: nodemgmt.c,v 1.127 2005/09/20 15:49:12 dedekind Exp $ 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds #include <linux/kernel.h> 151da177e4SLinus Torvalds #include <linux/slab.h> 161da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 171da177e4SLinus Torvalds #include <linux/compiler.h> 181da177e4SLinus Torvalds #include <linux/sched.h> /* For cond_resched() */ 191da177e4SLinus Torvalds #include "nodelist.h" 20e631ddbaSFerenc Havasi #include "debug.h" 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds /** 231da177e4SLinus Torvalds * jffs2_reserve_space - request physical space to write nodes to flash 241da177e4SLinus Torvalds * @c: superblock info 251da177e4SLinus Torvalds * @minsize: Minimum acceptable size of allocation 261da177e4SLinus Torvalds * @len: Returned value of allocation length 271da177e4SLinus Torvalds * @prio: Allocation type - ALLOC_{NORMAL,DELETION} 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Requests a block of physical space on the flash. Returns zero for success 309fe4854cSDavid Woodhouse * and puts 'len' into the appropriate place, or returns -ENOSPC or other 319fe4854cSDavid Woodhouse * error if appropriate. Doesn't return len since that's 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * If it returns zero, jffs2_reserve_space() also downs the per-filesystem 341da177e4SLinus Torvalds * allocation semaphore, to prevent more than one allocation from being 351da177e4SLinus Torvalds * active at any time. The semaphore is later released by jffs2_commit_allocation() 361da177e4SLinus Torvalds * 371da177e4SLinus Torvalds * jffs2_reserve_space() may trigger garbage collection in order to make room 381da177e4SLinus Torvalds * for the requested allocation. 391da177e4SLinus Torvalds */ 401da177e4SLinus Torvalds 41e631ddbaSFerenc Havasi static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, 429fe4854cSDavid Woodhouse uint32_t *len, uint32_t sumsize); 431da177e4SLinus Torvalds 449fe4854cSDavid Woodhouse int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, 45e631ddbaSFerenc Havasi uint32_t *len, int prio, uint32_t sumsize) 461da177e4SLinus Torvalds { 471da177e4SLinus Torvalds int ret = -EAGAIN; 481da177e4SLinus Torvalds int blocksneeded = c->resv_blocks_write; 491da177e4SLinus Torvalds /* align it */ 501da177e4SLinus Torvalds minsize = PAD(minsize); 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_reserve_space(): Requested 0x%x bytes\n", minsize)); 531da177e4SLinus Torvalds down(&c->alloc_sem); 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_reserve_space(): alloc sem got\n")); 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds /* this needs a little more thought (true <tglx> :)) */ 601da177e4SLinus Torvalds while(ret == -EAGAIN) { 611da177e4SLinus Torvalds while(c->nr_free_blocks + c->nr_erasing_blocks < blocksneeded) { 621da177e4SLinus Torvalds int ret; 631da177e4SLinus Torvalds uint32_t dirty, avail; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* calculate real dirty size 661da177e4SLinus Torvalds * dirty_size contains blocks on erase_pending_list 671da177e4SLinus Torvalds * those blocks are counted in c->nr_erasing_blocks. 681da177e4SLinus Torvalds * If one block is actually erased, it is not longer counted as dirty_space 691da177e4SLinus Torvalds * but it is counted in c->nr_erasing_blocks, so we add it and subtract it 701da177e4SLinus Torvalds * with c->nr_erasing_blocks * c->sector_size again. 711da177e4SLinus Torvalds * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks 721da177e4SLinus Torvalds * This helps us to force gc and pick eventually a clean block to spread the load. 731da177e4SLinus Torvalds * We add unchecked_size here, as we hopefully will find some space to use. 741da177e4SLinus Torvalds * This will affect the sum only once, as gc first finishes checking 751da177e4SLinus Torvalds * of nodes. 761da177e4SLinus Torvalds */ 771da177e4SLinus Torvalds dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size + c->unchecked_size; 781da177e4SLinus Torvalds if (dirty < c->nospc_dirty_size) { 791da177e4SLinus Torvalds if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { 804132ace8SArtem B. Bityuckiy D1(printk(KERN_NOTICE "jffs2_reserve_space(): Low on dirty space to GC, but it's a deletion. Allowing...\n")); 811da177e4SLinus Torvalds break; 821da177e4SLinus Torvalds } 831da177e4SLinus Torvalds D1(printk(KERN_DEBUG "dirty size 0x%08x + unchecked_size 0x%08x < nospc_dirty_size 0x%08x, returning -ENOSPC\n", 841da177e4SLinus Torvalds dirty, c->unchecked_size, c->sector_size)); 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 871da177e4SLinus Torvalds up(&c->alloc_sem); 881da177e4SLinus Torvalds return -ENOSPC; 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* Calc possibly available space. Possibly available means that we 921da177e4SLinus Torvalds * don't know, if unchecked size contains obsoleted nodes, which could give us some 931da177e4SLinus Torvalds * more usable space. This will affect the sum only once, as gc first finishes checking 941da177e4SLinus Torvalds * of nodes. 951da177e4SLinus Torvalds + Return -ENOSPC, if the maximum possibly available space is less or equal than 961da177e4SLinus Torvalds * blocksneeded * sector_size. 971da177e4SLinus Torvalds * This blocks endless gc looping on a filesystem, which is nearly full, even if 981da177e4SLinus Torvalds * the check above passes. 991da177e4SLinus Torvalds */ 1001da177e4SLinus Torvalds avail = c->free_size + c->dirty_size + c->erasing_size + c->unchecked_size; 1011da177e4SLinus Torvalds if ( (avail / c->sector_size) <= blocksneeded) { 1021da177e4SLinus Torvalds if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { 1034132ace8SArtem B. Bityuckiy D1(printk(KERN_NOTICE "jffs2_reserve_space(): Low on possibly available space, but it's a deletion. Allowing...\n")); 1041da177e4SLinus Torvalds break; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds D1(printk(KERN_DEBUG "max. available size 0x%08x < blocksneeded * sector_size 0x%08x, returning -ENOSPC\n", 1081da177e4SLinus Torvalds avail, blocksneeded * c->sector_size)); 1091da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 1101da177e4SLinus Torvalds up(&c->alloc_sem); 1111da177e4SLinus Torvalds return -ENOSPC; 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds up(&c->alloc_sem); 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds 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", 1171da177e4SLinus Torvalds 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, 1181da177e4SLinus Torvalds c->free_size + c->dirty_size + c->wasted_size + c->used_size + c->erasing_size + c->bad_size, c->flash_size)); 1191da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds ret = jffs2_garbage_collect_pass(c); 1221da177e4SLinus Torvalds if (ret) 1231da177e4SLinus Torvalds return ret; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds cond_resched(); 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds if (signal_pending(current)) 1281da177e4SLinus Torvalds return -EINTR; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds down(&c->alloc_sem); 1311da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1349fe4854cSDavid Woodhouse ret = jffs2_do_reserve_space(c, minsize, len, sumsize); 1351da177e4SLinus Torvalds if (ret) { 1361da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_reserve_space: ret is %d\n", ret)); 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds } 1391da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 1402f785402SDavid Woodhouse if (!ret) 141046b8b98SDavid Woodhouse ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); 1421da177e4SLinus Torvalds if (ret) 1431da177e4SLinus Torvalds up(&c->alloc_sem); 1441da177e4SLinus Torvalds return ret; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1479fe4854cSDavid Woodhouse int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, 148e631ddbaSFerenc Havasi uint32_t *len, uint32_t sumsize) 1491da177e4SLinus Torvalds { 1501da177e4SLinus Torvalds int ret = -EAGAIN; 1511da177e4SLinus Torvalds minsize = PAD(minsize); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_reserve_space_gc(): Requested 0x%x bytes\n", minsize)); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 1561da177e4SLinus Torvalds while(ret == -EAGAIN) { 1579fe4854cSDavid Woodhouse ret = jffs2_do_reserve_space(c, minsize, len, sumsize); 1581da177e4SLinus Torvalds if (ret) { 1591da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_reserve_space_gc: looping, ret is %d\n", ret)); 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 1632f785402SDavid Woodhouse if (!ret) 164046b8b98SDavid Woodhouse ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); 1652f785402SDavid Woodhouse 1661da177e4SLinus Torvalds return ret; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds 170e631ddbaSFerenc Havasi /* Classify nextblock (clean, dirty of verydirty) and force to select an other one */ 171e631ddbaSFerenc Havasi 172e631ddbaSFerenc Havasi static void jffs2_close_nextblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) 173e631ddbaSFerenc Havasi { 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* Check, if we have a dirty block now, or if it was dirty already */ 1761da177e4SLinus Torvalds if (ISDIRTY (jeb->wasted_size + jeb->dirty_size)) { 1771da177e4SLinus Torvalds c->dirty_size += jeb->wasted_size; 1781da177e4SLinus Torvalds c->wasted_size -= jeb->wasted_size; 1791da177e4SLinus Torvalds jeb->dirty_size += jeb->wasted_size; 1801da177e4SLinus Torvalds jeb->wasted_size = 0; 1811da177e4SLinus Torvalds if (VERYDIRTY(c, jeb->dirty_size)) { 1821da177e4SLinus Torvalds 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", 1831da177e4SLinus Torvalds jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); 1841da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->very_dirty_list); 1851da177e4SLinus Torvalds } else { 1861da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Adding full erase block at 0x%08x to dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", 1871da177e4SLinus Torvalds jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); 1881da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->dirty_list); 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds } else { 1911da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", 1921da177e4SLinus Torvalds jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); 1931da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->clean_list); 1941da177e4SLinus Torvalds } 195e631ddbaSFerenc Havasi c->nextblock = NULL; 196e631ddbaSFerenc Havasi 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 199e631ddbaSFerenc Havasi /* Select a new jeb for nextblock */ 200e631ddbaSFerenc Havasi 201e631ddbaSFerenc Havasi static int jffs2_find_nextblock(struct jffs2_sb_info *c) 202e631ddbaSFerenc Havasi { 2031da177e4SLinus Torvalds struct list_head *next; 204e631ddbaSFerenc Havasi 2051da177e4SLinus Torvalds /* Take the next block off the 'free' list */ 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds if (list_empty(&c->free_list)) { 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds if (!c->nr_erasing_blocks && 2101da177e4SLinus Torvalds !list_empty(&c->erasable_list)) { 2111da177e4SLinus Torvalds struct jffs2_eraseblock *ejeb; 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds ejeb = list_entry(c->erasable_list.next, struct jffs2_eraseblock, list); 214f116629dSAkinobu Mita list_move_tail(&ejeb->list, &c->erase_pending_list); 2151da177e4SLinus Torvalds c->nr_erasing_blocks++; 2161da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 217e631ddbaSFerenc Havasi D1(printk(KERN_DEBUG "jffs2_find_nextblock: Triggering erase of erasable block at 0x%08x\n", 2181da177e4SLinus Torvalds ejeb->offset)); 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds if (!c->nr_erasing_blocks && 2221da177e4SLinus Torvalds !list_empty(&c->erasable_pending_wbuf_list)) { 223e631ddbaSFerenc Havasi D1(printk(KERN_DEBUG "jffs2_find_nextblock: Flushing write buffer\n")); 2241da177e4SLinus Torvalds /* c->nextblock is NULL, no update to c->nextblock allowed */ 2251da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 2261da177e4SLinus Torvalds jffs2_flush_wbuf_pad(c); 2271da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 2281da177e4SLinus Torvalds /* Have another go. It'll be on the erasable_list now */ 2291da177e4SLinus Torvalds return -EAGAIN; 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds if (!c->nr_erasing_blocks) { 2331da177e4SLinus Torvalds /* Ouch. We're in GC, or we wouldn't have got here. 2341da177e4SLinus Torvalds And there's no space left. At all. */ 2351da177e4SLinus Torvalds 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", 2361da177e4SLinus Torvalds c->nr_erasing_blocks, c->nr_free_blocks, list_empty(&c->erasable_list)?"yes":"no", 2371da177e4SLinus Torvalds list_empty(&c->erasing_list)?"yes":"no", list_empty(&c->erase_pending_list)?"yes":"no"); 2381da177e4SLinus Torvalds return -ENOSPC; 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 2421da177e4SLinus Torvalds /* Don't wait for it; just erase one right now */ 2431da177e4SLinus Torvalds jffs2_erase_pending_blocks(c, 1); 2441da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* An erase may have failed, decreasing the 2471da177e4SLinus Torvalds amount of free space available. So we must 2481da177e4SLinus Torvalds restart from the beginning */ 2491da177e4SLinus Torvalds return -EAGAIN; 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds next = c->free_list.next; 2531da177e4SLinus Torvalds list_del(next); 254e631ddbaSFerenc Havasi c->nextblock = list_entry(next, struct jffs2_eraseblock, list); 2551da177e4SLinus Torvalds c->nr_free_blocks--; 2561da177e4SLinus Torvalds 257e631ddbaSFerenc Havasi jffs2_sum_reset_collected(c->summary); /* reset collected summary */ 258e631ddbaSFerenc Havasi 259e631ddbaSFerenc Havasi D1(printk(KERN_DEBUG "jffs2_find_nextblock(): new nextblock = 0x%08x\n", c->nextblock->offset)); 260e631ddbaSFerenc Havasi 261e631ddbaSFerenc Havasi return 0; 262e631ddbaSFerenc Havasi } 263e631ddbaSFerenc Havasi 264e631ddbaSFerenc Havasi /* Called with alloc sem _and_ erase_completion_lock */ 2659fe4854cSDavid Woodhouse static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, 2669fe4854cSDavid Woodhouse uint32_t *len, uint32_t sumsize) 267e631ddbaSFerenc Havasi { 268e631ddbaSFerenc Havasi struct jffs2_eraseblock *jeb = c->nextblock; 269e631ddbaSFerenc Havasi uint32_t reserved_size; /* for summary information at the end of the jeb */ 270e631ddbaSFerenc Havasi int ret; 271e631ddbaSFerenc Havasi 272e631ddbaSFerenc Havasi restart: 273e631ddbaSFerenc Havasi reserved_size = 0; 274e631ddbaSFerenc Havasi 275e631ddbaSFerenc Havasi if (jffs2_sum_active() && (sumsize != JFFS2_SUMMARY_NOSUM_SIZE)) { 276e631ddbaSFerenc Havasi /* NOSUM_SIZE means not to generate summary */ 277e631ddbaSFerenc Havasi 278e631ddbaSFerenc Havasi if (jeb) { 279e631ddbaSFerenc Havasi reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE); 280733802d9SArtem B. Bityutskiy dbg_summary("minsize=%d , jeb->free=%d ," 281e631ddbaSFerenc Havasi "summary->size=%d , sumsize=%d\n", 282e631ddbaSFerenc Havasi minsize, jeb->free_size, 283e631ddbaSFerenc Havasi c->summary->sum_size, sumsize); 284e631ddbaSFerenc Havasi } 285e631ddbaSFerenc Havasi 286e631ddbaSFerenc Havasi /* Is there enough space for writing out the current node, or we have to 287e631ddbaSFerenc Havasi write out summary information now, close this jeb and select new nextblock? */ 288e631ddbaSFerenc Havasi if (jeb && (PAD(minsize) + PAD(c->summary->sum_size + sumsize + 289e631ddbaSFerenc Havasi JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size)) { 290e631ddbaSFerenc Havasi 291e631ddbaSFerenc Havasi /* Has summary been disabled for this jeb? */ 292e631ddbaSFerenc Havasi if (jffs2_sum_is_disabled(c->summary)) { 293e631ddbaSFerenc Havasi sumsize = JFFS2_SUMMARY_NOSUM_SIZE; 294e631ddbaSFerenc Havasi goto restart; 295e631ddbaSFerenc Havasi } 296e631ddbaSFerenc Havasi 297e631ddbaSFerenc Havasi /* Writing out the collected summary information */ 298733802d9SArtem B. Bityutskiy dbg_summary("generating summary for 0x%08x.\n", jeb->offset); 299e631ddbaSFerenc Havasi ret = jffs2_sum_write_sumnode(c); 300e631ddbaSFerenc Havasi 301e631ddbaSFerenc Havasi if (ret) 302e631ddbaSFerenc Havasi return ret; 303e631ddbaSFerenc Havasi 304e631ddbaSFerenc Havasi if (jffs2_sum_is_disabled(c->summary)) { 305e631ddbaSFerenc Havasi /* jffs2_write_sumnode() couldn't write out the summary information 306e631ddbaSFerenc Havasi diabling summary for this jeb and free the collected information 307e631ddbaSFerenc Havasi */ 308e631ddbaSFerenc Havasi sumsize = JFFS2_SUMMARY_NOSUM_SIZE; 309e631ddbaSFerenc Havasi goto restart; 310e631ddbaSFerenc Havasi } 311e631ddbaSFerenc Havasi 312e631ddbaSFerenc Havasi jffs2_close_nextblock(c, jeb); 313e631ddbaSFerenc Havasi jeb = NULL; 31434c0e906SFerenc Havasi /* keep always valid value in reserved_size */ 31534c0e906SFerenc Havasi reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE); 316e631ddbaSFerenc Havasi } 317e631ddbaSFerenc Havasi } else { 318e631ddbaSFerenc Havasi if (jeb && minsize > jeb->free_size) { 319fc6612f6SDavid Woodhouse uint32_t waste; 320fc6612f6SDavid Woodhouse 321e631ddbaSFerenc Havasi /* Skip the end of this block and file it as having some dirty space */ 322e631ddbaSFerenc Havasi /* If there's a pending write to it, flush now */ 323e631ddbaSFerenc Havasi 324e631ddbaSFerenc Havasi if (jffs2_wbuf_dirty(c)) { 325e631ddbaSFerenc Havasi spin_unlock(&c->erase_completion_lock); 326e631ddbaSFerenc Havasi D1(printk(KERN_DEBUG "jffs2_do_reserve_space: Flushing write buffer\n")); 327e631ddbaSFerenc Havasi jffs2_flush_wbuf_pad(c); 328e631ddbaSFerenc Havasi spin_lock(&c->erase_completion_lock); 329e631ddbaSFerenc Havasi jeb = c->nextblock; 330e631ddbaSFerenc Havasi goto restart; 331e631ddbaSFerenc Havasi } 332e631ddbaSFerenc Havasi 333fc6612f6SDavid Woodhouse spin_unlock(&c->erase_completion_lock); 334fc6612f6SDavid Woodhouse 335fc6612f6SDavid Woodhouse ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); 336fc6612f6SDavid Woodhouse if (ret) 337fc6612f6SDavid Woodhouse return ret; 338fc6612f6SDavid Woodhouse /* Just lock it again and continue. Nothing much can change because 339fc6612f6SDavid Woodhouse we hold c->alloc_sem anyway. In fact, it's not entirely clear why 340fc6612f6SDavid Woodhouse we hold c->erase_completion_lock in the majority of this function... 341fc6612f6SDavid Woodhouse but that's a question for another (more caffeine-rich) day. */ 342fc6612f6SDavid Woodhouse spin_lock(&c->erase_completion_lock); 343fc6612f6SDavid Woodhouse 344fc6612f6SDavid Woodhouse waste = jeb->free_size; 345fc6612f6SDavid Woodhouse jffs2_link_node_ref(c, jeb, 346fc6612f6SDavid Woodhouse (jeb->offset + c->sector_size - waste) | REF_OBSOLETE, 347fc6612f6SDavid Woodhouse waste, NULL); 348fc6612f6SDavid Woodhouse /* FIXME: that made it count as dirty. Convert to wasted */ 349fc6612f6SDavid Woodhouse jeb->dirty_size -= waste; 350fc6612f6SDavid Woodhouse c->dirty_size -= waste; 351fc6612f6SDavid Woodhouse jeb->wasted_size += waste; 352fc6612f6SDavid Woodhouse c->wasted_size += waste; 353e631ddbaSFerenc Havasi 354e631ddbaSFerenc Havasi jffs2_close_nextblock(c, jeb); 355e631ddbaSFerenc Havasi jeb = NULL; 356e631ddbaSFerenc Havasi } 357e631ddbaSFerenc Havasi } 358e631ddbaSFerenc Havasi 359e631ddbaSFerenc Havasi if (!jeb) { 360e631ddbaSFerenc Havasi 361e631ddbaSFerenc Havasi ret = jffs2_find_nextblock(c); 362e631ddbaSFerenc Havasi if (ret) 363e631ddbaSFerenc Havasi return ret; 364e631ddbaSFerenc Havasi 365e631ddbaSFerenc Havasi jeb = c->nextblock; 366e631ddbaSFerenc Havasi 3671da177e4SLinus Torvalds if (jeb->free_size != c->sector_size - c->cleanmarker_size) { 3681da177e4SLinus Torvalds printk(KERN_WARNING "Eep. Block 0x%08x taken from free_list had free_size of 0x%08x!!\n", jeb->offset, jeb->free_size); 3691da177e4SLinus Torvalds goto restart; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds /* OK, jeb (==c->nextblock) is now pointing at a block which definitely has 3731da177e4SLinus Torvalds enough space */ 374e631ddbaSFerenc Havasi *len = jeb->free_size - reserved_size; 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds if (c->cleanmarker_size && jeb->used_size == c->cleanmarker_size && 3771da177e4SLinus Torvalds !jeb->first_node->next_in_ino) { 3781da177e4SLinus Torvalds /* Only node in it beforehand was a CLEANMARKER node (we think). 3791da177e4SLinus Torvalds So mark it obsolete now that there's going to be another node 3801da177e4SLinus Torvalds in the block. This will reduce used_size to zero but We've 3811da177e4SLinus Torvalds already set c->nextblock so that jffs2_mark_node_obsolete() 3821da177e4SLinus Torvalds won't try to refile it to the dirty_list. 3831da177e4SLinus Torvalds */ 3841da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 3851da177e4SLinus Torvalds jffs2_mark_node_obsolete(c, jeb->first_node); 3861da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3899fe4854cSDavid Woodhouse D1(printk(KERN_DEBUG "jffs2_do_reserve_space(): Giving 0x%x bytes at 0x%x\n", 3909fe4854cSDavid Woodhouse *len, jeb->offset + (c->sector_size - jeb->free_size))); 3911da177e4SLinus Torvalds return 0; 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds /** 3951da177e4SLinus Torvalds * jffs2_add_physical_node_ref - add a physical node reference to the list 3961da177e4SLinus Torvalds * @c: superblock info 3971da177e4SLinus Torvalds * @new: new node reference to add 3981da177e4SLinus Torvalds * @len: length of this physical node 3991da177e4SLinus Torvalds * 4001da177e4SLinus Torvalds * Should only be used to report nodes for which space has been allocated 4011da177e4SLinus Torvalds * by jffs2_reserve_space. 4021da177e4SLinus Torvalds * 4031da177e4SLinus Torvalds * Must be called with the alloc_sem held. 4041da177e4SLinus Torvalds */ 4051da177e4SLinus Torvalds 4062f785402SDavid Woodhouse struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c, 4072f785402SDavid Woodhouse uint32_t ofs, uint32_t len, 4082f785402SDavid Woodhouse struct jffs2_inode_cache *ic) 4091da177e4SLinus Torvalds { 4101da177e4SLinus Torvalds struct jffs2_eraseblock *jeb; 4112f785402SDavid Woodhouse struct jffs2_raw_node_ref *new; 4121da177e4SLinus Torvalds 4132f785402SDavid Woodhouse jeb = &c->blocks[ofs / c->sector_size]; 4141da177e4SLinus Torvalds 4152f785402SDavid Woodhouse D1(printk(KERN_DEBUG "jffs2_add_physical_node_ref(): Node at 0x%x(%d), size 0x%x\n", 4162f785402SDavid Woodhouse ofs & ~3, ofs & 3, len)); 4171da177e4SLinus Torvalds #if 1 4182f785402SDavid Woodhouse /* Allow non-obsolete nodes only to be added at the end of c->nextblock, 4192f785402SDavid Woodhouse if c->nextblock is set. Note that wbuf.c will file obsolete nodes 4202f785402SDavid Woodhouse even after refiling c->nextblock */ 4212f785402SDavid Woodhouse if ((c->nextblock || ((ofs & 3) != REF_OBSOLETE)) 4222f785402SDavid Woodhouse && (jeb != c->nextblock || (ofs & ~3) != jeb->offset + (c->sector_size - jeb->free_size))) { 4231da177e4SLinus Torvalds printk(KERN_WARNING "argh. node added in wrong place\n"); 4242f785402SDavid Woodhouse return ERR_PTR(-EINVAL); 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds #endif 4271da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 4281da177e4SLinus Torvalds 4292f785402SDavid Woodhouse new = jffs2_link_node_ref(c, jeb, ofs, len, ic); 4301da177e4SLinus Torvalds 4319b88f473SEstelle Hammache if (!jeb->free_size && !jeb->dirty_size && !ISDIRTY(jeb->wasted_size)) { 4321da177e4SLinus Torvalds /* If it lives on the dirty_list, jffs2_reserve_space will put it there */ 4331da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", 4341da177e4SLinus Torvalds jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); 4351da177e4SLinus Torvalds if (jffs2_wbuf_dirty(c)) { 4361da177e4SLinus Torvalds /* Flush the last write in the block if it's outstanding */ 4371da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 4381da177e4SLinus Torvalds jffs2_flush_wbuf_pad(c); 4391da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->clean_list); 4431da177e4SLinus Torvalds c->nextblock = NULL; 4441da177e4SLinus Torvalds } 445e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_sanity_check_nolock(c,jeb); 446e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 4491da177e4SLinus Torvalds 4502f785402SDavid Woodhouse return new; 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds void jffs2_complete_reservation(struct jffs2_sb_info *c) 4551da177e4SLinus Torvalds { 4561da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_complete_reservation()\n")); 4571da177e4SLinus Torvalds jffs2_garbage_collect_trigger(c); 4581da177e4SLinus Torvalds up(&c->alloc_sem); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds static inline int on_list(struct list_head *obj, struct list_head *head) 4621da177e4SLinus Torvalds { 4631da177e4SLinus Torvalds struct list_head *this; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds list_for_each(this, head) { 4661da177e4SLinus Torvalds if (this == obj) { 4671da177e4SLinus Torvalds D1(printk("%p is on list at %p\n", obj, head)); 4681da177e4SLinus Torvalds return 1; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds return 0; 4731da177e4SLinus Torvalds } 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref) 4761da177e4SLinus Torvalds { 4771da177e4SLinus Torvalds struct jffs2_eraseblock *jeb; 4781da177e4SLinus Torvalds int blocknr; 4791da177e4SLinus Torvalds struct jffs2_unknown_node n; 4801da177e4SLinus Torvalds int ret, addedsize; 4811da177e4SLinus Torvalds size_t retlen; 4821417fc44SDavid Woodhouse uint32_t freed_len; 4831da177e4SLinus Torvalds 4849bfeb691SDavid Woodhouse if(unlikely(!ref)) { 4851da177e4SLinus Torvalds printk(KERN_NOTICE "EEEEEK. jffs2_mark_node_obsolete called with NULL node\n"); 4861da177e4SLinus Torvalds return; 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds if (ref_obsolete(ref)) { 4891da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_mark_node_obsolete called with already obsolete node at 0x%08x\n", ref_offset(ref))); 4901da177e4SLinus Torvalds return; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds blocknr = ref->flash_offset / c->sector_size; 4931da177e4SLinus Torvalds if (blocknr >= c->nr_blocks) { 4941da177e4SLinus Torvalds printk(KERN_NOTICE "raw node at 0x%08x is off the end of device!\n", ref->flash_offset); 4951da177e4SLinus Torvalds BUG(); 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds jeb = &c->blocks[blocknr]; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds if (jffs2_can_mark_obsolete(c) && !jffs2_is_readonly(c) && 50031fbdf7aSArtem B. Bityuckiy !(c->flags & (JFFS2_SB_FLAG_SCANNING | JFFS2_SB_FLAG_BUILDING))) { 5011da177e4SLinus Torvalds /* Hm. This may confuse static lock analysis. If any of the above 5021da177e4SLinus Torvalds three conditions is false, we're going to return from this 5031da177e4SLinus Torvalds function without actually obliterating any nodes or freeing 5041da177e4SLinus Torvalds any jffs2_raw_node_refs. So we don't need to stop erases from 5051da177e4SLinus Torvalds happening, or protect against people holding an obsolete 5061da177e4SLinus Torvalds jffs2_raw_node_ref without the erase_completion_lock. */ 5071da177e4SLinus Torvalds down(&c->erase_free_sem); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 5111da177e4SLinus Torvalds 5121417fc44SDavid Woodhouse freed_len = ref_totlen(c, jeb, ref); 5131417fc44SDavid Woodhouse 5141da177e4SLinus Torvalds if (ref_flags(ref) == REF_UNCHECKED) { 5151417fc44SDavid Woodhouse D1(if (unlikely(jeb->unchecked_size < freed_len)) { 5161da177e4SLinus Torvalds 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", 5171417fc44SDavid Woodhouse freed_len, blocknr, ref->flash_offset, jeb->used_size); 5181da177e4SLinus Torvalds BUG(); 5191da177e4SLinus Torvalds }) 5201417fc44SDavid Woodhouse D1(printk(KERN_DEBUG "Obsoleting previously unchecked node at 0x%08x of len %x: ", ref_offset(ref), freed_len)); 5211417fc44SDavid Woodhouse jeb->unchecked_size -= freed_len; 5221417fc44SDavid Woodhouse c->unchecked_size -= freed_len; 5231da177e4SLinus Torvalds } else { 5241417fc44SDavid Woodhouse D1(if (unlikely(jeb->used_size < freed_len)) { 5251da177e4SLinus Torvalds 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", 5261417fc44SDavid Woodhouse freed_len, blocknr, ref->flash_offset, jeb->used_size); 5271da177e4SLinus Torvalds BUG(); 5281da177e4SLinus Torvalds }) 5291417fc44SDavid Woodhouse D1(printk(KERN_DEBUG "Obsoleting node at 0x%08x of len %#x: ", ref_offset(ref), freed_len)); 5301417fc44SDavid Woodhouse jeb->used_size -= freed_len; 5311417fc44SDavid Woodhouse c->used_size -= freed_len; 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds // Take care, that wasted size is taken into concern 5351417fc44SDavid Woodhouse if ((jeb->dirty_size || ISDIRTY(jeb->wasted_size + freed_len)) && jeb != c->nextblock) { 536c7c16c8eSDavid Woodhouse D1(printk("Dirtying\n")); 5371417fc44SDavid Woodhouse addedsize = freed_len; 5381417fc44SDavid Woodhouse jeb->dirty_size += freed_len; 5391417fc44SDavid Woodhouse c->dirty_size += freed_len; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* Convert wasted space to dirty, if not a bad block */ 5421da177e4SLinus Torvalds if (jeb->wasted_size) { 5431da177e4SLinus Torvalds if (on_list(&jeb->list, &c->bad_used_list)) { 5441da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Leaving block at %08x on the bad_used_list\n", 5451da177e4SLinus Torvalds jeb->offset)); 5461da177e4SLinus Torvalds addedsize = 0; /* To fool the refiling code later */ 5471da177e4SLinus Torvalds } else { 5481da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Converting %d bytes of wasted space to dirty in block at %08x\n", 5491da177e4SLinus Torvalds jeb->wasted_size, jeb->offset)); 5501da177e4SLinus Torvalds addedsize += jeb->wasted_size; 5511da177e4SLinus Torvalds jeb->dirty_size += jeb->wasted_size; 5521da177e4SLinus Torvalds c->dirty_size += jeb->wasted_size; 5531da177e4SLinus Torvalds c->wasted_size -= jeb->wasted_size; 5541da177e4SLinus Torvalds jeb->wasted_size = 0; 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds } else { 558c7c16c8eSDavid Woodhouse D1(printk("Wasting\n")); 5591da177e4SLinus Torvalds addedsize = 0; 5601417fc44SDavid Woodhouse jeb->wasted_size += freed_len; 5611417fc44SDavid Woodhouse c->wasted_size += freed_len; 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds ref->flash_offset = ref_offset(ref) | REF_OBSOLETE; 5641da177e4SLinus Torvalds 565e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_sanity_check_nolock(c, jeb); 566e0c8e42fSArtem B. Bityutskiy jffs2_dbg_acct_paranoia_check_nolock(c, jeb); 5671da177e4SLinus Torvalds 56831fbdf7aSArtem B. Bityuckiy if (c->flags & JFFS2_SB_FLAG_SCANNING) { 56931fbdf7aSArtem B. Bityuckiy /* Flash scanning is in progress. Don't muck about with the block 5701da177e4SLinus Torvalds lists because they're not ready yet, and don't actually 5711da177e4SLinus Torvalds obliterate nodes that look obsolete. If they weren't 5721da177e4SLinus Torvalds marked obsolete on the flash at the time they _became_ 5731da177e4SLinus Torvalds obsolete, there was probably a reason for that. */ 5741da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 5751da177e4SLinus Torvalds /* We didn't lock the erase_free_sem */ 5761da177e4SLinus Torvalds return; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds if (jeb == c->nextblock) { 5801da177e4SLinus Torvalds D2(printk(KERN_DEBUG "Not moving nextblock 0x%08x to dirty/erase_pending list\n", jeb->offset)); 5811da177e4SLinus Torvalds } else if (!jeb->used_size && !jeb->unchecked_size) { 5821da177e4SLinus Torvalds if (jeb == c->gcblock) { 5831da177e4SLinus Torvalds D1(printk(KERN_DEBUG "gcblock at 0x%08x completely dirtied. Clearing gcblock...\n", jeb->offset)); 5841da177e4SLinus Torvalds c->gcblock = NULL; 5851da177e4SLinus Torvalds } else { 5861da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Eraseblock at 0x%08x completely dirtied. Removing from (dirty?) list...\n", jeb->offset)); 5871da177e4SLinus Torvalds list_del(&jeb->list); 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds if (jffs2_wbuf_dirty(c)) { 5901da177e4SLinus Torvalds D1(printk(KERN_DEBUG "...and adding to erasable_pending_wbuf_list\n")); 5911da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->erasable_pending_wbuf_list); 5921da177e4SLinus Torvalds } else { 5931da177e4SLinus Torvalds if (jiffies & 127) { 5941da177e4SLinus Torvalds /* Most of the time, we just erase it immediately. Otherwise we 5951da177e4SLinus Torvalds spend ages scanning it on mount, etc. */ 5961da177e4SLinus Torvalds D1(printk(KERN_DEBUG "...and adding to erase_pending_list\n")); 5971da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->erase_pending_list); 5981da177e4SLinus Torvalds c->nr_erasing_blocks++; 5991da177e4SLinus Torvalds jffs2_erase_pending_trigger(c); 6001da177e4SLinus Torvalds } else { 6011da177e4SLinus Torvalds /* Sometimes, however, we leave it elsewhere so it doesn't get 6021da177e4SLinus Torvalds immediately reused, and we spread the load a bit. */ 6031da177e4SLinus Torvalds D1(printk(KERN_DEBUG "...and adding to erasable_list\n")); 6041da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->erasable_list); 6051da177e4SLinus Torvalds } 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Done OK\n")); 6081da177e4SLinus Torvalds } else if (jeb == c->gcblock) { 6091da177e4SLinus Torvalds D2(printk(KERN_DEBUG "Not moving gcblock 0x%08x to dirty_list\n", jeb->offset)); 6101da177e4SLinus Torvalds } else if (ISDIRTY(jeb->dirty_size) && !ISDIRTY(jeb->dirty_size - addedsize)) { 6111da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Eraseblock at 0x%08x is freshly dirtied. Removing from clean list...\n", jeb->offset)); 6121da177e4SLinus Torvalds list_del(&jeb->list); 6131da177e4SLinus Torvalds D1(printk(KERN_DEBUG "...and adding to dirty_list\n")); 6141da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->dirty_list); 6151da177e4SLinus Torvalds } else if (VERYDIRTY(c, jeb->dirty_size) && 6161da177e4SLinus Torvalds !VERYDIRTY(c, jeb->dirty_size - addedsize)) { 6171da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Eraseblock at 0x%08x is now very dirty. Removing from dirty list...\n", jeb->offset)); 6181da177e4SLinus Torvalds list_del(&jeb->list); 6191da177e4SLinus Torvalds D1(printk(KERN_DEBUG "...and adding to very_dirty_list\n")); 6201da177e4SLinus Torvalds list_add_tail(&jeb->list, &c->very_dirty_list); 6211da177e4SLinus Torvalds } else { 6221da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Eraseblock at 0x%08x not moved anywhere. (free 0x%08x, dirty 0x%08x, used 0x%08x)\n", 6231da177e4SLinus Torvalds jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size)); 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 6271da177e4SLinus Torvalds 62831fbdf7aSArtem B. Bityuckiy if (!jffs2_can_mark_obsolete(c) || jffs2_is_readonly(c) || 62931fbdf7aSArtem B. Bityuckiy (c->flags & JFFS2_SB_FLAG_BUILDING)) { 6301da177e4SLinus Torvalds /* We didn't lock the erase_free_sem */ 6311da177e4SLinus Torvalds return; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* The erase_free_sem is locked, and has been since before we marked the node obsolete 6351da177e4SLinus Torvalds and potentially put its eraseblock onto the erase_pending_list. Thus, we know that 6361da177e4SLinus Torvalds the block hasn't _already_ been erased, and that 'ref' itself hasn't been freed yet 637c38c1b61SDavid Woodhouse by jffs2_free_jeb_node_refs() in erase.c. Which is nice. */ 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds D1(printk(KERN_DEBUG "obliterating obsoleted node at 0x%08x\n", ref_offset(ref))); 6401da177e4SLinus Torvalds ret = jffs2_flash_read(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); 6411da177e4SLinus Torvalds if (ret) { 6421da177e4SLinus Torvalds printk(KERN_WARNING "Read error reading from obsoleted node at 0x%08x: %d\n", ref_offset(ref), ret); 6431da177e4SLinus Torvalds goto out_erase_sem; 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds if (retlen != sizeof(n)) { 6461da177e4SLinus Torvalds printk(KERN_WARNING "Short read from obsoleted node at 0x%08x: %zd\n", ref_offset(ref), retlen); 6471da177e4SLinus Torvalds goto out_erase_sem; 6481da177e4SLinus Torvalds } 6491417fc44SDavid Woodhouse if (PAD(je32_to_cpu(n.totlen)) != PAD(freed_len)) { 6501417fc44SDavid Woodhouse printk(KERN_WARNING "Node totlen on flash (0x%08x) != totlen from node ref (0x%08x)\n", je32_to_cpu(n.totlen), freed_len); 6511da177e4SLinus Torvalds goto out_erase_sem; 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds if (!(je16_to_cpu(n.nodetype) & JFFS2_NODE_ACCURATE)) { 6541da177e4SLinus Torvalds D1(printk(KERN_DEBUG "Node at 0x%08x was already marked obsolete (nodetype 0x%04x)\n", ref_offset(ref), je16_to_cpu(n.nodetype))); 6551da177e4SLinus Torvalds goto out_erase_sem; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds /* XXX FIXME: This is ugly now */ 6581da177e4SLinus Torvalds n.nodetype = cpu_to_je16(je16_to_cpu(n.nodetype) & ~JFFS2_NODE_ACCURATE); 6591da177e4SLinus Torvalds ret = jffs2_flash_write(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); 6601da177e4SLinus Torvalds if (ret) { 6611da177e4SLinus Torvalds printk(KERN_WARNING "Write error in obliterating obsoleted node at 0x%08x: %d\n", ref_offset(ref), ret); 6621da177e4SLinus Torvalds goto out_erase_sem; 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds if (retlen != sizeof(n)) { 6651da177e4SLinus Torvalds printk(KERN_WARNING "Short write in obliterating obsoleted node at 0x%08x: %zd\n", ref_offset(ref), retlen); 6661da177e4SLinus Torvalds goto out_erase_sem; 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds /* Nodes which have been marked obsolete no longer need to be 6701da177e4SLinus Torvalds associated with any inode. Remove them from the per-inode list. 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds Note we can't do this for NAND at the moment because we need 6731da177e4SLinus Torvalds obsolete dirent nodes to stay on the lists, because of the 6741da177e4SLinus Torvalds horridness in jffs2_garbage_collect_deletion_dirent(). Also 6751da177e4SLinus Torvalds because we delete the inocache, and on NAND we need that to 6761da177e4SLinus Torvalds stay around until all the nodes are actually erased, in order 6771da177e4SLinus Torvalds to stop us from giving the same inode number to another newly 6781da177e4SLinus Torvalds created inode. */ 6791da177e4SLinus Torvalds if (ref->next_in_ino) { 6801da177e4SLinus Torvalds struct jffs2_inode_cache *ic; 6811da177e4SLinus Torvalds struct jffs2_raw_node_ref **p; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds spin_lock(&c->erase_completion_lock); 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds ic = jffs2_raw_ref_to_ic(ref); 6860eac940bSDavid Woodhouse /* It seems we should never call jffs2_mark_node_obsolete() for 6870eac940bSDavid Woodhouse XATTR nodes.... yet. Make sure we notice if/when we change 6880eac940bSDavid Woodhouse that :) */ 6890eac940bSDavid Woodhouse BUG_ON(ic->class != RAWNODE_CLASS_INODE_CACHE); 6901da177e4SLinus Torvalds for (p = &ic->nodes; (*p) != ref; p = &((*p)->next_in_ino)) 6911da177e4SLinus Torvalds ; 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds *p = ref->next_in_ino; 6941da177e4SLinus Torvalds ref->next_in_ino = NULL; 6951da177e4SLinus Torvalds 696437316d9SArtem B. Bityuckiy if (ic->nodes == (void *)ic && ic->nlink == 0) 6971da177e4SLinus Torvalds jffs2_del_ino_cache(c, ic); 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds spin_unlock(&c->erase_completion_lock); 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds out_erase_sem: 7031da177e4SLinus Torvalds up(&c->erase_free_sem); 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds int jffs2_thread_should_wake(struct jffs2_sb_info *c) 7071da177e4SLinus Torvalds { 7081da177e4SLinus Torvalds int ret = 0; 7091da177e4SLinus Torvalds uint32_t dirty; 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds if (c->unchecked_size) { 7121da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_thread_should_wake(): unchecked_size %d, checked_ino #%d\n", 7131da177e4SLinus Torvalds c->unchecked_size, c->checked_ino)); 7141da177e4SLinus Torvalds return 1; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds /* dirty_size contains blocks on erase_pending_list 7181da177e4SLinus Torvalds * those blocks are counted in c->nr_erasing_blocks. 7191da177e4SLinus Torvalds * If one block is actually erased, it is not longer counted as dirty_space 7201da177e4SLinus Torvalds * but it is counted in c->nr_erasing_blocks, so we add it and subtract it 7211da177e4SLinus Torvalds * with c->nr_erasing_blocks * c->sector_size again. 7221da177e4SLinus Torvalds * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks 7231da177e4SLinus Torvalds * This helps us to force gc and pick eventually a clean block to spread the load. 7241da177e4SLinus Torvalds */ 7251da177e4SLinus Torvalds dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size; 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds if (c->nr_free_blocks + c->nr_erasing_blocks < c->resv_blocks_gctrigger && 7281da177e4SLinus Torvalds (dirty > c->nospc_dirty_size)) 7291da177e4SLinus Torvalds ret = 1; 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds D1(printk(KERN_DEBUG "jffs2_thread_should_wake(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x: %s\n", 7321da177e4SLinus Torvalds c->nr_free_blocks, c->nr_erasing_blocks, c->dirty_size, ret?"yes":"no")); 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds return ret; 7351da177e4SLinus Torvalds } 736