int jffs2_reserve_space(struct jffs2_sb_info *c, __u32 minsize, __u32 *ofs, __u32 *len, int prio)
{
int ret = -EAGAIN;
int blocksneeded = JFFS2_RESERVED_BLOCKS_WRITE;
/* align it */
minsize = PAD(minsize);
if (prio == ALLOC_DELETION)
blocksneeded = JFFS2_RESERVED_BLOCKS_DELETION;
D1(printk(KERN_DEBUG "jffs2_reserve_space(): Requested 0x%x bytes\n", minsize));
down(&c->alloc_sem);
D1(printk(KERN_DEBUG "jffs2_reserve_space(): alloc sem got\n"));
spin_lock_bh(&c->erase_completion_lock);
/* this needs a little more thought */
while(ret == -EAGAIN) {
while(c->nr_free_blocks + c->nr_erasing_blocks < blocksneeded) {
int ret;
up(&c->alloc_sem);
if (c->dirty_size < c->sector_size) {
D1(printk(KERN_DEBUG "Short on space, but total dirty size 0x%08x < sector size 0x%08x, so -ENOSPC\n", c->dirty_size, c->sector_size));
spin_unlock_bh(&c->erase_completion_lock);
return -ENOSPC;
}
D1(printk(KERN_DEBUG "Triggering GC pass. nr_free_blocks %d, nr_erasing_blocks %d, free_size 0x%08x, dirty_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->used_size, c->erasing_size, c->bad_size,
c->free_size + c->dirty_size + c->used_size + c->erasing_size + c->bad_size, c->flash_size));
spin_unlock_bh(&c->erase_completion_lock);
ret = jffs2_garbage_collect_pass(c);
if (ret)
return ret;
if (current->need_resched)
schedule();
if (signal_pending(current))
return -EINTR;
down(&c->alloc_sem);
spin_lock_bh(&c->erase_completion_lock);
}
ret = jffs2_do_reserve_space(c, minsize, ofs, len);
if (ret) {
D1(printk(KERN_DEBUG "jffs2_reserve_space: ret is %d\n", ret));
}
}
spin_unlock_bh(&c->erase_completion_lock);
if (ret)
up(&c->alloc_sem);
return ret;
}
int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs, uint32_t *len)
{
int ret = -EAGAIN;
minsize = PAD(minsize);
D1(printk(KERN_DEBUG "jffs2_reserve_space_gc(): Requested 0x%x bytes\n", minsize));
spin_lock(&c->erase_completion_lock);
while(ret == -EAGAIN) {
ret = jffs2_do_reserve_space(c, minsize, ofs, len);
if (ret) {
D1(printk(KERN_DEBUG "jffs2_reserve_space_gc: looping, ret is %d\n", ret));
}
}
spin_unlock(&c->erase_completion_lock);
return ret;
}
int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, uint32_t *ofs, uint32_t *len, int prio)
{
int ret = -EAGAIN;
int blocksneeded = c->resv_blocks_write;
/* align it */
minsize = PAD(minsize);
D1(printk(KERN_DEBUG "jffs2_reserve_space(): Requested 0x%x bytes\n", minsize));
down(&c->alloc_sem);
D1(printk(KERN_DEBUG "jffs2_reserve_space(): alloc sem got\n"));
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) {
int ret;
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) {
D1(printk(KERN_NOTICE "jffs2_reserve_space(): Low on dirty space to GC, but it's a deletion. Allowing...\n"));
break;
}
D1(printk(KERN_DEBUG "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);
up(&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) {
D1(printk(KERN_NOTICE "jffs2_reserve_space(): Low on possibly available space, but it's a deletion. Allowing...\n"));
break;
}
D1(printk(KERN_DEBUG "max. available size 0x%08x < blocksneeded * sector_size 0x%08x, returning -ENOSPC\n",
avail, blocksneeded * c->sector_size));
spin_unlock(&c->erase_completion_lock);
up(&c->alloc_sem);
return -ENOSPC;
}
up(&c->alloc_sem);
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",
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)
return ret;
cond_resched();
if (signal_pending(current))
return -EINTR;
down(&c->alloc_sem);
spin_lock(&c->erase_completion_lock);
}
ret = jffs2_do_reserve_space(c, minsize, ofs, len);
if (ret) {
D1(printk(KERN_DEBUG "jffs2_reserve_space: ret is %d\n", ret));
}
}
spin_unlock(&c->erase_completion_lock);
if (ret)
up(&c->alloc_sem);
return ret;
}