diff options
Diffstat (limited to 'kernel/fs/jffs2/nodemgmt.c')
| -rw-r--r-- | kernel/fs/jffs2/nodemgmt.c | 883 |
1 files changed, 883 insertions, 0 deletions
diff --git a/kernel/fs/jffs2/nodemgmt.c b/kernel/fs/jffs2/nodemgmt.c new file mode 100644 index 000000000..b6bd4affd --- /dev/null +++ b/kernel/fs/jffs2/nodemgmt.c @@ -0,0 +1,883 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright © 2001-2007 Red Hat, Inc. + * + * Created by David Woodhouse <dwmw2@infradead.org> + * + * For licensing information, see the file 'LICENCE' in this directory. + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/mtd/mtd.h> +#include <linux/compiler.h> +#include <linux/sched.h> /* For cond_resched() */ +#include "nodelist.h" +#include "debug.h" + +/* + * Check whether the user is allowed to write. + */ +static int jffs2_rp_can_write(struct jffs2_sb_info *c) +{ + uint32_t avail; + struct jffs2_mount_opts *opts = &c->mount_opts; + + avail = c->dirty_size + c->free_size + c->unchecked_size + + c->erasing_size - c->resv_blocks_write * c->sector_size + - c->nospc_dirty_size; + + if (avail < 2 * opts->rp_size) + jffs2_dbg(1, "rpsize %u, dirty_size %u, free_size %u, " + "erasing_size %u, unchecked_size %u, " + "nr_erasing_blocks %u, avail %u, resrv %u\n", + opts->rp_size, c->dirty_size, c->free_size, + c->erasing_size, c->unchecked_size, + c->nr_erasing_blocks, avail, c->nospc_dirty_size); + + if (avail > opts->rp_size) + return 1; + + /* Always allow root */ + if (capable(CAP_SYS_RESOURCE)) + return 1; + + jffs2_dbg(1, "forbid writing\n"); + return 0; +} + +/** + * jffs2_reserve_space - request physical space to write nodes to flash + * @c: superblock info + * @minsize: Minimum acceptable size of allocation + * @len: Returned value of allocation length + * @prio: Allocation type - ALLOC_{NORMAL,DELETION} + * + * Requests a block of physical space on the flash. Returns zero for success + * and puts 'len' into the appropriate place, or returns -ENOSPC or other + * error if appropriate. Doesn't return len since that's + * + * If it returns zero, jffs2_reserve_space() also downs the per-filesystem + * allocation semaphore, to prevent more than one allocation from being + * active at any time. The semaphore is later released by jffs2_commit_allocation() + * + * jffs2_reserve_space() may trigger garbage collection in order to make room + * for the requested allocation. + */ + +static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, + uint32_t *len, uint32_t sumsize); + +int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, + uint32_t *len, int prio, uint32_t sumsize) +{ + int ret = -EAGAIN; + int blocksneeded = c->resv_blocks_write; + /* align it */ + minsize = PAD(minsize); + + jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize); + mutex_lock(&c->alloc_sem); + + jffs2_dbg(1, "%s(): alloc sem got\n", __func__); + + spin_lock(&c->erase_completion_lock); + + /* + * Check if the free space is greater then size of the reserved pool. + * If not, only allow root to proceed with writing. + */ + if (prio != ALLOC_DELETION && !jffs2_rp_can_write(c)) { + ret = -ENOSPC; + goto out; + } + + /* this needs a little more thought (true <tglx> :)) */ + while(ret == -EAGAIN) { + while(c->nr_free_blocks + c->nr_erasing_blocks < blocksneeded) { + uint32_t dirty, avail; + + /* calculate real dirty size + * dirty_size contains blocks on erase_pending_list + * those blocks are counted in c->nr_erasing_blocks. + * If one block is actually erased, it is not longer counted as dirty_space + * but it is counted in c->nr_erasing_blocks, so we add it and subtract it + * with c->nr_erasing_blocks * c->sector_size again. + * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks + * This helps us to force gc and pick eventually a clean block to spread the load. + * We add unchecked_size here, as we hopefully will find some space to use. + * This will affect the sum only once, as gc first finishes checking + * of nodes. + */ + dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size + c->unchecked_size; + if (dirty < c->nospc_dirty_size) { + if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { + jffs2_dbg(1, "%s(): Low on dirty space to GC, but it's a deletion. Allowing...\n", + __func__); + break; + } + jffs2_dbg(1, "dirty size 0x%08x + unchecked_size 0x%08x < nospc_dirty_size 0x%08x, returning -ENOSPC\n", + dirty, c->unchecked_size, + c->sector_size); + + spin_unlock(&c->erase_completion_lock); + mutex_unlock(&c->alloc_sem); + return -ENOSPC; + } + + /* Calc possibly available space. Possibly available means that we + * don't know, if unchecked size contains obsoleted nodes, which could give us some + * more usable space. This will affect the sum only once, as gc first finishes checking + * of nodes. + + Return -ENOSPC, if the maximum possibly available space is less or equal than + * blocksneeded * sector_size. + * This blocks endless gc looping on a filesystem, which is nearly full, even if + * the check above passes. + */ + avail = c->free_size + c->dirty_size + c->erasing_size + c->unchecked_size; + if ( (avail / c->sector_size) <= blocksneeded) { + if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) { + jffs2_dbg(1, "%s(): Low on possibly available space, but it's a deletion. Allowing...\n", + __func__); + break; + } + + jffs2_dbg(1, "max. available size 0x%08x < blocksneeded * sector_size 0x%08x, returning -ENOSPC\n", + avail, blocksneeded * c->sector_size); + spin_unlock(&c->erase_completion_lock); + mutex_unlock(&c->alloc_sem); + return -ENOSPC; + } + + mutex_unlock(&c->alloc_sem); + + 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", + 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, + c->free_size + c->dirty_size + + c->wasted_size + c->used_size + + c->erasing_size + c->bad_size, + c->flash_size); + spin_unlock(&c->erase_completion_lock); + + ret = jffs2_garbage_collect_pass(c); + + if (ret == -EAGAIN) { + spin_lock(&c->erase_completion_lock); + if (c->nr_erasing_blocks && + list_empty(&c->erase_pending_list) && + list_empty(&c->erase_complete_list)) { + DECLARE_WAITQUEUE(wait, current); + set_current_state(TASK_UNINTERRUPTIBLE); + add_wait_queue(&c->erase_wait, &wait); + jffs2_dbg(1, "%s waiting for erase to complete\n", + __func__); + spin_unlock(&c->erase_completion_lock); + + schedule(); + remove_wait_queue(&c->erase_wait, &wait); + } else + spin_unlock(&c->erase_completion_lock); + } else if (ret) + return ret; + + cond_resched(); + + if (signal_pending(current)) + return -EINTR; + + mutex_lock(&c->alloc_sem); + spin_lock(&c->erase_completion_lock); + } + + ret = jffs2_do_reserve_space(c, minsize, len, sumsize); + if (ret) { + jffs2_dbg(1, "%s(): ret is %d\n", __func__, ret); + } + } + +out: + spin_unlock(&c->erase_completion_lock); + if (!ret) + ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); + if (ret) + mutex_unlock(&c->alloc_sem); + return ret; +} + +int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, + uint32_t *len, uint32_t sumsize) +{ + int ret; + minsize = PAD(minsize); + + jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize); + + while (true) { + spin_lock(&c->erase_completion_lock); + ret = jffs2_do_reserve_space(c, minsize, len, sumsize); + if (ret) { + jffs2_dbg(1, "%s(): looping, ret is %d\n", + __func__, ret); + } + spin_unlock(&c->erase_completion_lock); + + if (ret == -EAGAIN) + cond_resched(); + else + break; + } + if (!ret) + ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1); + + return ret; +} + + +/* Classify nextblock (clean, dirty of verydirty) and force to select an other one */ + +static void jffs2_close_nextblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) +{ + + if (c->nextblock == NULL) { + jffs2_dbg(1, "%s(): Erase block at 0x%08x has already been placed in a list\n", + __func__, jeb->offset); + return; + } + /* Check, if we have a dirty block now, or if it was dirty already */ + if (ISDIRTY (jeb->wasted_size + jeb->dirty_size)) { + c->dirty_size += jeb->wasted_size; + c->wasted_size -= jeb->wasted_size; + jeb->dirty_size += jeb->wasted_size; + jeb->wasted_size = 0; + if (VERYDIRTY(c, jeb->dirty_size)) { + jffs2_dbg(1, "Adding full erase block at 0x%08x to very_dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", + jeb->offset, jeb->free_size, jeb->dirty_size, + jeb->used_size); + list_add_tail(&jeb->list, &c->very_dirty_list); + } else { + jffs2_dbg(1, "Adding full erase block at 0x%08x to dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", + jeb->offset, jeb->free_size, jeb->dirty_size, + jeb->used_size); + list_add_tail(&jeb->list, &c->dirty_list); + } + } else { + jffs2_dbg(1, "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", + jeb->offset, jeb->free_size, jeb->dirty_size, + jeb->used_size); + list_add_tail(&jeb->list, &c->clean_list); + } + c->nextblock = NULL; + +} + +/* Select a new jeb for nextblock */ + +static int jffs2_find_nextblock(struct jffs2_sb_info *c) +{ + struct list_head *next; + + /* Take the next block off the 'free' list */ + + if (list_empty(&c->free_list)) { + + if (!c->nr_erasing_blocks && + !list_empty(&c->erasable_list)) { + struct jffs2_eraseblock *ejeb; + + ejeb = list_entry(c->erasable_list.next, struct jffs2_eraseblock, list); + list_move_tail(&ejeb->list, &c->erase_pending_list); + c->nr_erasing_blocks++; + jffs2_garbage_collect_trigger(c); + jffs2_dbg(1, "%s(): Triggering erase of erasable block at 0x%08x\n", + __func__, ejeb->offset); + } + + if (!c->nr_erasing_blocks && + !list_empty(&c->erasable_pending_wbuf_list)) { + jffs2_dbg(1, "%s(): Flushing write buffer\n", + __func__); + /* c->nextblock is NULL, no update to c->nextblock allowed */ + spin_unlock(&c->erase_completion_lock); + jffs2_flush_wbuf_pad(c); + spin_lock(&c->erase_completion_lock); + /* Have another go. It'll be on the erasable_list now */ + return -EAGAIN; + } + + if (!c->nr_erasing_blocks) { + /* Ouch. We're in GC, or we wouldn't have got here. + And there's no space left. At all. */ + 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", + c->nr_erasing_blocks, c->nr_free_blocks, + list_empty(&c->erasable_list) ? "yes" : "no", + list_empty(&c->erasing_list) ? "yes" : "no", + list_empty(&c->erase_pending_list) ? "yes" : "no"); + return -ENOSPC; + } + + spin_unlock(&c->erase_completion_lock); + /* Don't wait for it; just erase one right now */ + jffs2_erase_pending_blocks(c, 1); + spin_lock(&c->erase_completion_lock); + + /* An erase may have failed, decreasing the + amount of free space available. So we must + restart from the beginning */ + return -EAGAIN; + } + + next = c->free_list.next; + list_del(next); + c->nextblock = list_entry(next, struct jffs2_eraseblock, list); + c->nr_free_blocks--; + + jffs2_sum_reset_collected(c->summary); /* reset collected summary */ + +#ifdef CONFIG_JFFS2_FS_WRITEBUFFER + /* adjust write buffer offset, else we get a non contiguous write bug */ + if (!(c->wbuf_ofs % c->sector_size) && !c->wbuf_len) + c->wbuf_ofs = 0xffffffff; +#endif + + jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n", + __func__, c->nextblock->offset); + + return 0; +} + +/* Called with alloc sem _and_ erase_completion_lock */ +static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, + uint32_t *len, uint32_t sumsize) +{ + struct jffs2_eraseblock *jeb = c->nextblock; + uint32_t reserved_size; /* for summary information at the end of the jeb */ + int ret; + + restart: + reserved_size = 0; + + if (jffs2_sum_active() && (sumsize != JFFS2_SUMMARY_NOSUM_SIZE)) { + /* NOSUM_SIZE means not to generate summary */ + + if (jeb) { + reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE); + dbg_summary("minsize=%d , jeb->free=%d ," + "summary->size=%d , sumsize=%d\n", + minsize, jeb->free_size, + c->summary->sum_size, sumsize); + } + + /* Is there enough space for writing out the current node, or we have to + write out summary information now, close this jeb and select new nextblock? */ + if (jeb && (PAD(minsize) + PAD(c->summary->sum_size + sumsize + + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size)) { + + /* Has summary been disabled for this jeb? */ + if (jffs2_sum_is_disabled(c->summary)) { + sumsize = JFFS2_SUMMARY_NOSUM_SIZE; + goto restart; + } + + /* Writing out the collected summary information */ + dbg_summary("generating summary for 0x%08x.\n", jeb->offset); + ret = jffs2_sum_write_sumnode(c); + + if (ret) + return ret; + + if (jffs2_sum_is_disabled(c->summary)) { + /* jffs2_write_sumnode() couldn't write out the summary information + diabling summary for this jeb and free the collected information + */ + sumsize = JFFS2_SUMMARY_NOSUM_SIZE; + goto restart; + } + + jffs2_close_nextblock(c, jeb); + jeb = NULL; + /* keep always valid value in reserved_size */ + reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE); + } + } else { + if (jeb && minsize > jeb->free_size) { + uint32_t waste; + + /* Skip the end of this block and file it as having some dirty space */ + /* If there's a pending write to it, flush now */ + + if (jffs2_wbuf_dirty(c)) { + spin_unlock(&c->erase_completion_lock); + jffs2_dbg(1, "%s(): Flushing write buffer\n", + __func__); + jffs2_flush_wbuf_pad(c); + spin_lock(&c->erase_completion_lock); + jeb = c->nextblock; + goto restart; + } + + spin_unlock(&c->erase_completion_lock); + + ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); + + /* Just lock it again and continue. Nothing much can change because + we hold c->alloc_sem anyway. In fact, it's not entirely clear why + we hold c->erase_completion_lock in the majority of this function... + but that's a question for another (more caffeine-rich) day. */ + spin_lock(&c->erase_completion_lock); + + if (ret) + return ret; + + waste = jeb->free_size; + jffs2_link_node_ref(c, jeb, + (jeb->offset + c->sector_size - waste) | REF_OBSOLETE, + waste, NULL); + /* FIXME: that made it count as dirty. Convert to wasted */ + jeb->dirty_size -= waste; + c->dirty_size -= waste; + jeb->wasted_size += waste; + c->wasted_size += waste; + + jffs2_close_nextblock(c, jeb); + jeb = NULL; + } + } + + if (!jeb) { + + ret = jffs2_find_nextblock(c); + if (ret) + return ret; + + jeb = c->nextblock; + + if (jeb->free_size != c->sector_size - c->cleanmarker_size) { + pr_warn("Eep. Block 0x%08x taken from free_list had free_size of 0x%08x!!\n", + jeb->offset, jeb->free_size); + goto restart; + } + } + /* OK, jeb (==c->nextblock) is now pointing at a block which definitely has + enough space */ + *len = jeb->free_size - reserved_size; + + if (c->cleanmarker_size && jeb->used_size == c->cleanmarker_size && + !jeb->first_node->next_in_ino) { + /* Only node in it beforehand was a CLEANMARKER node (we think). + So mark it obsolete now that there's going to be another node + in the block. This will reduce used_size to zero but We've + already set c->nextblock so that jffs2_mark_node_obsolete() + won't try to refile it to the dirty_list. + */ + spin_unlock(&c->erase_completion_lock); + jffs2_mark_node_obsolete(c, jeb->first_node); + spin_lock(&c->erase_completion_lock); + } + + jffs2_dbg(1, "%s(): Giving 0x%x bytes at 0x%x\n", + __func__, + *len, jeb->offset + (c->sector_size - jeb->free_size)); + return 0; +} + +/** + * jffs2_add_physical_node_ref - add a physical node reference to the list + * @c: superblock info + * @new: new node reference to add + * @len: length of this physical node + * + * Should only be used to report nodes for which space has been allocated + * by jffs2_reserve_space. + * + * Must be called with the alloc_sem held. + */ + +struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c, + uint32_t ofs, uint32_t len, + struct jffs2_inode_cache *ic) +{ + struct jffs2_eraseblock *jeb; + struct jffs2_raw_node_ref *new; + + jeb = &c->blocks[ofs / c->sector_size]; + + jffs2_dbg(1, "%s(): Node at 0x%x(%d), size 0x%x\n", + __func__, ofs & ~3, ofs & 3, len); +#if 1 + /* Allow non-obsolete nodes only to be added at the end of c->nextblock, + if c->nextblock is set. Note that wbuf.c will file obsolete nodes + even after refiling c->nextblock */ + if ((c->nextblock || ((ofs & 3) != REF_OBSOLETE)) + && (jeb != c->nextblock || (ofs & ~3) != jeb->offset + (c->sector_size - jeb->free_size))) { + pr_warn("argh. node added in wrong place at 0x%08x(%d)\n", + ofs & ~3, ofs & 3); + if (c->nextblock) + pr_warn("nextblock 0x%08x", c->nextblock->offset); + else + pr_warn("No nextblock"); + pr_cont(", expected at %08x\n", + jeb->offset + (c->sector_size - jeb->free_size)); + return ERR_PTR(-EINVAL); + } +#endif + spin_lock(&c->erase_completion_lock); + + new = jffs2_link_node_ref(c, jeb, ofs, len, ic); + + if (!jeb->free_size && !jeb->dirty_size && !ISDIRTY(jeb->wasted_size)) { + /* If it lives on the dirty_list, jffs2_reserve_space will put it there */ + jffs2_dbg(1, "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n", + jeb->offset, jeb->free_size, jeb->dirty_size, + jeb->used_size); + if (jffs2_wbuf_dirty(c)) { + /* Flush the last write in the block if it's outstanding */ + spin_unlock(&c->erase_completion_lock); + jffs2_flush_wbuf_pad(c); + spin_lock(&c->erase_completion_lock); + } + + list_add_tail(&jeb->list, &c->clean_list); + c->nextblock = NULL; + } + jffs2_dbg_acct_sanity_check_nolock(c,jeb); + jffs2_dbg_acct_paranoia_check_nolock(c, jeb); + + spin_unlock(&c->erase_completion_lock); + + return new; +} + + +void jffs2_complete_reservation(struct jffs2_sb_info *c) +{ + jffs2_dbg(1, "jffs2_complete_reservation()\n"); + spin_lock(&c->erase_completion_lock); + jffs2_garbage_collect_trigger(c); + spin_unlock(&c->erase_completion_lock); + mutex_unlock(&c->alloc_sem); +} + +static inline int on_list(struct list_head *obj, struct list_head *head) +{ + struct list_head *this; + + list_for_each(this, head) { + if (this == obj) { + jffs2_dbg(1, "%p is on list at %p\n", obj, head); + return 1; + + } + } + return 0; +} + +void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref) +{ + struct jffs2_eraseblock *jeb; + int blocknr; + struct jffs2_unknown_node n; + int ret, addedsize; + size_t retlen; + uint32_t freed_len; + + if(unlikely(!ref)) { + pr_notice("EEEEEK. jffs2_mark_node_obsolete called with NULL node\n"); + return; + } + if (ref_obsolete(ref)) { + jffs2_dbg(1, "%s(): called with already obsolete node at 0x%08x\n", + __func__, ref_offset(ref)); + return; + } + blocknr = ref->flash_offset / c->sector_size; + if (blocknr >= c->nr_blocks) { + pr_notice("raw node at 0x%08x is off the end of device!\n", + ref->flash_offset); + BUG(); + } + jeb = &c->blocks[blocknr]; + + if (jffs2_can_mark_obsolete(c) && !jffs2_is_readonly(c) && + !(c->flags & (JFFS2_SB_FLAG_SCANNING | JFFS2_SB_FLAG_BUILDING))) { + /* Hm. This may confuse static lock analysis. If any of the above + three conditions is false, we're going to return from this + function without actually obliterating any nodes or freeing + any jffs2_raw_node_refs. So we don't need to stop erases from + happening, or protect against people holding an obsolete + jffs2_raw_node_ref without the erase_completion_lock. */ + mutex_lock(&c->erase_free_sem); + } + + spin_lock(&c->erase_completion_lock); + + freed_len = ref_totlen(c, jeb, ref); + + if (ref_flags(ref) == REF_UNCHECKED) { + D1(if (unlikely(jeb->unchecked_size < freed_len)) { + 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", + freed_len, blocknr, + ref->flash_offset, jeb->used_size); + BUG(); + }) + jffs2_dbg(1, "Obsoleting previously unchecked node at 0x%08x of len %x\n", + ref_offset(ref), freed_len); + jeb->unchecked_size -= freed_len; + c->unchecked_size -= freed_len; + } else { + D1(if (unlikely(jeb->used_size < freed_len)) { + pr_notice("raw node of size 0x%08x freed from erase block %d at 0x%08x, but used_size was already 0x%08x\n", + freed_len, blocknr, + ref->flash_offset, jeb->used_size); + BUG(); + }) + jffs2_dbg(1, "Obsoleting node at 0x%08x of len %#x: ", + ref_offset(ref), freed_len); + jeb->used_size -= freed_len; + c->used_size -= freed_len; + } + + // Take care, that wasted size is taken into concern + if ((jeb->dirty_size || ISDIRTY(jeb->wasted_size + freed_len)) && jeb != c->nextblock) { + jffs2_dbg(1, "Dirtying\n"); + addedsize = freed_len; + jeb->dirty_size += freed_len; + c->dirty_size += freed_len; + + /* Convert wasted space to dirty, if not a bad block */ + if (jeb->wasted_size) { + if (on_list(&jeb->list, &c->bad_used_list)) { + jffs2_dbg(1, "Leaving block at %08x on the bad_used_list\n", + jeb->offset); + addedsize = 0; /* To fool the refiling code later */ + } else { + jffs2_dbg(1, "Converting %d bytes of wasted space to dirty in block at %08x\n", + jeb->wasted_size, jeb->offset); + addedsize += jeb->wasted_size; + jeb->dirty_size += jeb->wasted_size; + c->dirty_size += jeb->wasted_size; + c->wasted_size -= jeb->wasted_size; + jeb->wasted_size = 0; + } + } + } else { + jffs2_dbg(1, "Wasting\n"); + addedsize = 0; + jeb->wasted_size += freed_len; + c->wasted_size += freed_len; + } + ref->flash_offset = ref_offset(ref) | REF_OBSOLETE; + + jffs2_dbg_acct_sanity_check_nolock(c, jeb); + jffs2_dbg_acct_paranoia_check_nolock(c, jeb); + + if (c->flags & JFFS2_SB_FLAG_SCANNING) { + /* Flash scanning is in progress. Don't muck about with the block + lists because they're not ready yet, and don't actually + obliterate nodes that look obsolete. If they weren't + marked obsolete on the flash at the time they _became_ + obsolete, there was probably a reason for that. */ + spin_unlock(&c->erase_completion_lock); + /* We didn't lock the erase_free_sem */ + return; + } + + if (jeb == c->nextblock) { + jffs2_dbg(2, "Not moving nextblock 0x%08x to dirty/erase_pending list\n", + jeb->offset); + } else if (!jeb->used_size && !jeb->unchecked_size) { + if (jeb == c->gcblock) { + jffs2_dbg(1, "gcblock at 0x%08x completely dirtied. Clearing gcblock...\n", + jeb->offset); + c->gcblock = NULL; + } else { + jffs2_dbg(1, "Eraseblock at 0x%08x completely dirtied. Removing from (dirty?) list...\n", + jeb->offset); + list_del(&jeb->list); + } + if (jffs2_wbuf_dirty(c)) { + jffs2_dbg(1, "...and adding to erasable_pending_wbuf_list\n"); + list_add_tail(&jeb->list, &c->erasable_pending_wbuf_list); + } else { + if (jiffies & 127) { + /* Most of the time, we just erase it immediately. Otherwise we + spend ages scanning it on mount, etc. */ + jffs2_dbg(1, "...and adding to erase_pending_list\n"); + list_add_tail(&jeb->list, &c->erase_pending_list); + c->nr_erasing_blocks++; + jffs2_garbage_collect_trigger(c); + } else { + /* Sometimes, however, we leave it elsewhere so it doesn't get + immediately reused, and we spread the load a bit. */ + jffs2_dbg(1, "...and adding to erasable_list\n"); + list_add_tail(&jeb->list, &c->erasable_list); + } + } + jffs2_dbg(1, "Done OK\n"); + } else if (jeb == c->gcblock) { + jffs2_dbg(2, "Not moving gcblock 0x%08x to dirty_list\n", + jeb->offset); + } else if (ISDIRTY(jeb->dirty_size) && !ISDIRTY(jeb->dirty_size - addedsize)) { + jffs2_dbg(1, "Eraseblock at 0x%08x is freshly dirtied. Removing from clean list...\n", + jeb->offset); + list_del(&jeb->list); + jffs2_dbg(1, "...and adding to dirty_list\n"); + list_add_tail(&jeb->list, &c->dirty_list); + } else if (VERYDIRTY(c, jeb->dirty_size) && + !VERYDIRTY(c, jeb->dirty_size - addedsize)) { + jffs2_dbg(1, "Eraseblock at 0x%08x is now very dirty. Removing from dirty list...\n", + jeb->offset); + list_del(&jeb->list); + jffs2_dbg(1, "...and adding to very_dirty_list\n"); + list_add_tail(&jeb->list, &c->very_dirty_list); + } else { + jffs2_dbg(1, "Eraseblock at 0x%08x not moved anywhere. (free 0x%08x, dirty 0x%08x, used 0x%08x)\n", + jeb->offset, jeb->free_size, jeb->dirty_size, + jeb->used_size); + } + + spin_unlock(&c->erase_completion_lock); + + if (!jffs2_can_mark_obsolete(c) || jffs2_is_readonly(c) || + (c->flags & JFFS2_SB_FLAG_BUILDING)) { + /* We didn't lock the erase_free_sem */ + return; + } + + /* The erase_free_sem is locked, and has been since before we marked the node obsolete + and potentially put its eraseblock onto the erase_pending_list. Thus, we know that + the block hasn't _already_ been erased, and that 'ref' itself hasn't been freed yet + by jffs2_free_jeb_node_refs() in erase.c. Which is nice. */ + + jffs2_dbg(1, "obliterating obsoleted node at 0x%08x\n", + ref_offset(ref)); + ret = jffs2_flash_read(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); + if (ret) { + pr_warn("Read error reading from obsoleted node at 0x%08x: %d\n", + ref_offset(ref), ret); + goto out_erase_sem; + } + if (retlen != sizeof(n)) { + pr_warn("Short read from obsoleted node at 0x%08x: %zd\n", + ref_offset(ref), retlen); + goto out_erase_sem; + } + if (PAD(je32_to_cpu(n.totlen)) != PAD(freed_len)) { + pr_warn("Node totlen on flash (0x%08x) != totlen from node ref (0x%08x)\n", + je32_to_cpu(n.totlen), freed_len); + goto out_erase_sem; + } + if (!(je16_to_cpu(n.nodetype) & JFFS2_NODE_ACCURATE)) { + jffs2_dbg(1, "Node at 0x%08x was already marked obsolete (nodetype 0x%04x)\n", + ref_offset(ref), je16_to_cpu(n.nodetype)); + goto out_erase_sem; + } + /* XXX FIXME: This is ugly now */ + n.nodetype = cpu_to_je16(je16_to_cpu(n.nodetype) & ~JFFS2_NODE_ACCURATE); + ret = jffs2_flash_write(c, ref_offset(ref), sizeof(n), &retlen, (char *)&n); + if (ret) { + pr_warn("Write error in obliterating obsoleted node at 0x%08x: %d\n", + ref_offset(ref), ret); + goto out_erase_sem; + } + if (retlen != sizeof(n)) { + pr_warn("Short write in obliterating obsoleted node at 0x%08x: %zd\n", + ref_offset(ref), retlen); + goto out_erase_sem; + } + + /* Nodes which have been marked obsolete no longer need to be + associated with any inode. Remove them from the per-inode list. + + Note we can't do this for NAND at the moment because we need + obsolete dirent nodes to stay on the lists, because of the + horridness in jffs2_garbage_collect_deletion_dirent(). Also + because we delete the inocache, and on NAND we need that to + stay around until all the nodes are actually erased, in order + to stop us from giving the same inode number to another newly + created inode. */ + if (ref->next_in_ino) { + struct jffs2_inode_cache *ic; + struct jffs2_raw_node_ref **p; + + spin_lock(&c->erase_completion_lock); + + ic = jffs2_raw_ref_to_ic(ref); + for (p = &ic->nodes; (*p) != ref; p = &((*p)->next_in_ino)) + ; + + *p = ref->next_in_ino; + ref->next_in_ino = NULL; + + switch (ic->class) { +#ifdef CONFIG_JFFS2_FS_XATTR + case RAWNODE_CLASS_XATTR_DATUM: + jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic); + break; + case RAWNODE_CLASS_XATTR_REF: + jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic); + break; +#endif + default: + if (ic->nodes == (void *)ic && ic->pino_nlink == 0) + jffs2_del_ino_cache(c, ic); + break; + } + spin_unlock(&c->erase_completion_lock); + } + + out_erase_sem: + mutex_unlock(&c->erase_free_sem); +} + +int jffs2_thread_should_wake(struct jffs2_sb_info *c) +{ + int ret = 0; + uint32_t dirty; + int nr_very_dirty = 0; + struct jffs2_eraseblock *jeb; + + if (!list_empty(&c->erase_complete_list) || + !list_empty(&c->erase_pending_list)) + return 1; + + if (c->unchecked_size) { + jffs2_dbg(1, "jffs2_thread_should_wake(): unchecked_size %d, checked_ino #%d\n", + c->unchecked_size, c->checked_ino); + return 1; + } + + /* dirty_size contains blocks on erase_pending_list + * those blocks are counted in c->nr_erasing_blocks. + * If one block is actually erased, it is not longer counted as dirty_space + * but it is counted in c->nr_erasing_blocks, so we add it and subtract it + * with c->nr_erasing_blocks * c->sector_size again. + * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks + * This helps us to force gc and pick eventually a clean block to spread the load. + */ + dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size; + + if (c->nr_free_blocks + c->nr_erasing_blocks < c->resv_blocks_gctrigger && + (dirty > c->nospc_dirty_size)) + ret = 1; + + list_for_each_entry(jeb, &c->very_dirty_list, list) { + nr_very_dirty++; + if (nr_very_dirty == c->vdirty_blocks_gctrigger) { + ret = 1; + /* In debug mode, actually go through and count them all */ + D1(continue); + break; + } + } + + jffs2_dbg(1, "%s(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x, vdirty_blocks %d: %s\n", + __func__, c->nr_free_blocks, c->nr_erasing_blocks, + c->dirty_size, nr_very_dirty, ret ? "yes" : "no"); + + return ret; +} |