[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/jffs2/nodemgmt.c b/ap/os/linux/linux-3.4.x/fs/jffs2/nodemgmt.c
new file mode 100644
index 0000000..0fc68e0
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/jffs2/nodemgmt.c
@@ -0,0 +1,884 @@
+/*
+ * 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"
+
+extern void jffs2_quick_gc_done(struct jffs2_sb_info *c);
+
+/**
+ * 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);
+
+ /* 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);
+ }
+ }
+ 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 (c->flags, 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(c->flags, 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(c->flags, 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(c->flags, jeb->dirty_size) && !ISDIRTY(c->flags, 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_sb_is_dirty(struct jffs2_sb_info *c)
+{
+ if(c->quick_wait == 1) {
+ c->quick_wait = 2;
+ c->quick_gcblock_count = 0;
+ return 1;
+ }
+
+ if(c->quick_gcblock_count > 40000)
+ return 0;
+
+ if (!list_empty(&c->bad_used_list) && c->nr_free_blocks > c->resv_blocks_gcbad) {
+ return 1;
+ } else if (!list_empty(&c->erasable_list)) {
+ return 1;
+ } else if (!list_empty(&c->very_dirty_list)) {
+ return 1;
+ } else if (!list_empty(&c->dirty_list)) {
+ if (c->quick_wait == 2)
+ c->quick_gcblock_count += 1;
+ return 1;
+ } else if (!list_empty(&c->erasable_pending_wbuf_list)) {
+ return 1;
+ }
+
+ if(c->gcblock) {
+ if(c->gcblock->used_size > 0)
+ return 1;
+ } else
+ c->quick_gcblock_count += 1;
+
+ /* Eep. All were empty */
+ return 0;
+}
+
+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(c->flags & JFFS2_SB_FLAG_QUICK_GC) {
+ if(jffs2_sb_is_dirty(c))
+ return 1;
+ }
+
+ 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;
+}