/* Called with alloc sem _and_ erase_completion_lock */
static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs, uint32_t *len)
{
struct jffs2_eraseblock *jeb = c->nextblock;
restart:
if (jeb && minsize > jeb->free_size) {
/* 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);
D1(printk(KERN_DEBUG "jffs2_do_reserve_space: Flushing write buffer\n"));
jffs2_flush_wbuf_pad(c);
spin_lock(&c->erase_completion_lock);
jeb = c->nextblock;
goto restart;
}
c->wasted_size += jeb->free_size;
c->free_size -= jeb->free_size;
jeb->wasted_size += jeb->free_size;
jeb->free_size = 0;
/* 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)) {
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",
jeb->offset, jeb->free_size, jeb->dirty_size, jeb->used_size));
list_add_tail(&jeb->list, &c->very_dirty_list);
} else {
D1(printk(KERN_DEBUG "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 {
D1(printk(KERN_DEBUG "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 = jeb = NULL;
}
if (!jeb) {
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_del(&ejeb->list);
list_add_tail(&ejeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
jffs2_erase_pending_trigger(c);
D1(printk(KERN_DEBUG "jffs2_do_reserve_space: Triggering erase of erasable block at 0x%08x\n",
ejeb->offset));
}
if (!c->nr_erasing_blocks &&
!list_empty(&c->erasable_pending_wbuf_list)) {
D1(printk(KERN_DEBUG "jffs2_do_reserve_space: Flushing write buffer\n"));
/* 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. */
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",
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 = jeb = list_entry(next, struct jffs2_eraseblock, list);
c->nr_free_blocks--;
if (jeb->free_size != c->sector_size - c->cleanmarker_size) {
printk(KERN_WARNING "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 */
*ofs = jeb->offset + (c->sector_size - jeb->free_size);
*len = jeb->free_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);
}
D1(printk(KERN_DEBUG "jffs2_do_reserve_space(): Giving 0x%x bytes at 0x%x\n", *len, *ofs));
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 *ofs, 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) {
/* 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);
D1(printk(KERN_DEBUG "jffs2_do_reserve_space: Flushing write buffer\n"));
jffs2_flush_wbuf_pad(c);
spin_lock(&c->erase_completion_lock);
jeb = c->nextblock;
goto restart;
}
c->wasted_size += jeb->free_size;
c->free_size -= jeb->free_size;
jeb->wasted_size += jeb->free_size;
jeb->free_size = 0;
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) {
printk(KERN_WARNING "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 */
*ofs = jeb->offset + (c->sector_size - jeb->free_size);
*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);
}
D1(printk(KERN_DEBUG "jffs2_do_reserve_space(): Giving 0x%x bytes at 0x%x\n", *len, *ofs));
return 0;
}