static void jffs2_put_super (struct super_block *sb)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
down(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
up(&c->alloc_sem);
jffs2_sum_exit(c);
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
if (jffs2_blocks_use_vmalloc(c))
vfree(c->blocks);
else
kfree(c->blocks);
jffs2_flash_cleanup(c);
kfree(c->inocache_list);
jffs2_clear_xattr_subsystem(c);
if (c->mtd->sync)
c->mtd->sync(c->mtd);
D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}
static void jffs2_put_super (struct super_block *sb)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
jffs2_dbg(2, "%s()\n", __func__);
if (sb->s_dirt)
jffs2_write_super(sb);
mutex_lock(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
mutex_unlock(&c->alloc_sem);
jffs2_sum_exit(c);
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
if (jffs2_blocks_use_vmalloc(c))
vfree(c->blocks);
else
kfree(c->blocks);
jffs2_flash_cleanup(c);
kfree(c->inocache_list);
jffs2_clear_xattr_subsystem(c);
mtd_sync(c->mtd);
jffs2_dbg(1, "%s(): returning\n", __func__);
}
int jffs2_remount_fs (struct super_block *sb, int *flags, char *data)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
return -EROFS;
/* We stop if it was running, then restart if it needs to.
This also catches the case where it was stopped and this
is just a remount to restart it.
Flush the writebuffer, if neccecary, else we loose it */
if (!(sb->s_flags & MS_RDONLY)) {
jffs2_stop_garbage_collect_thread(c);
down(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
up(&c->alloc_sem);
}
if (!(*flags & MS_RDONLY))
jffs2_start_garbage_collect_thread(c);
*flags |= MS_NOATIME;
return 0;
}
static int jffs2_sync_fs(struct super_block *sb, int wait)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
down(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
up(&c->alloc_sem);
return 0;
}
static int jffs2_sync_fs(struct super_block *sb, int wait)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
jffs2_write_super(sb);
mutex_lock(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
mutex_unlock(&c->alloc_sem);
return 0;
}
static int jffs2_sync_fs(struct super_block *sb, int wait)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
cancel_delayed_work_sync(&c->wbuf_dwork);
#endif
mutex_lock(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
mutex_unlock(&c->alloc_sem);
return 0;
}
static void jffs2_put_super (struct super_block *sb)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
if (!(sb->s_flags & MS_RDONLY))
jffs2_stop_garbage_collect_thread(c);
down(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
up(&c->alloc_sem);
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
kfree(c->blocks);
jffs2_flash_cleanup(c);
kfree(c->inocache_list);
if (c->mtd->sync)
c->mtd->sync(c->mtd);
D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}
static void jffs2_put_super (struct super_block *sb)
{
struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
down(&c->alloc_sem);
jffs2_flush_wbuf_pad(c);
up(&c->alloc_sem);
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
if (c->mtd->flags & MTD_NO_VIRTBLOCKS)
vfree(c->blocks);
else
kfree(c->blocks);
jffs2_flash_cleanup(c);
kfree(c->inocache_list);
if (c->mtd->sync)
c->mtd->sync(c->mtd);
D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}
/* 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;
}
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_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_find_nextblock: 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_find_nextblock: 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 = list_entry(next, struct jffs2_eraseblock, list);
c->nr_free_blocks--;
jffs2_sum_reset_collected(c->summary); /* reset collected summary */
D1(printk(KERN_DEBUG "jffs2_find_nextblock(): new nextblock = 0x%08x\n", c->nextblock->offset));
return 0;
}
/* Called with erase_completion_lock held */
static struct jffs2_eraseblock *jffs2_find_gc_block(struct jffs2_sb_info *c)
{
struct jffs2_eraseblock *ret;
struct list_head *nextlist = NULL;
int n = jiffies % 128;
/* Pick an eraseblock to garbage collect next. This is where we'll
put the clever wear-levelling algorithms. Eventually. */
/* We possibly want to favour the dirtier blocks more when the
number of free blocks is low. */
again:
if (!list_empty(&c->bad_used_list) && c->nr_free_blocks > c->resv_blocks_gcbad) {
D1(printk(KERN_DEBUG "Picking block from bad_used_list to GC next\n"));
nextlist = &c->bad_used_list;
} else if (n < 50 && !list_empty(&c->erasable_list)) {
/* Note that most of them will have gone directly to be erased.
So don't favour the erasable_list _too_ much. */
D1(printk(KERN_DEBUG "Picking block from erasable_list to GC next\n"));
nextlist = &c->erasable_list;
} else if (n < 110 && !list_empty(&c->very_dirty_list)) {
/* Most of the time, pick one off the very_dirty list */
D1(printk(KERN_DEBUG "Picking block from very_dirty_list to GC next\n"));
nextlist = &c->very_dirty_list;
} else if (n < 126 && !list_empty(&c->dirty_list)) {
D1(printk(KERN_DEBUG "Picking block from dirty_list to GC next\n"));
nextlist = &c->dirty_list;
} else if (!list_empty(&c->clean_list)) {
D1(printk(KERN_DEBUG "Picking block from clean_list to GC next\n"));
nextlist = &c->clean_list;
} else if (!list_empty(&c->dirty_list)) {
D1(printk(KERN_DEBUG "Picking block from dirty_list to GC next (clean_list was empty)\n"));
nextlist = &c->dirty_list;
} else if (!list_empty(&c->very_dirty_list)) {
D1(printk(KERN_DEBUG "Picking block from very_dirty_list to GC next (clean_list and dirty_list were empty)\n"));
nextlist = &c->very_dirty_list;
} else if (!list_empty(&c->erasable_list)) {
D1(printk(KERN_DEBUG "Picking block from erasable_list to GC next (clean_list and {very_,}dirty_list were empty)\n"));
nextlist = &c->erasable_list;
} else if (!list_empty(&c->erasable_pending_wbuf_list)) {
/* There are blocks are wating for the wbuf sync */
D1(printk(KERN_DEBUG "Synching wbuf in order to reuse erasable_pending_wbuf_list blocks\n"));
spin_unlock(&c->erase_completion_lock);
jffs2_flush_wbuf_pad(c);
spin_lock(&c->erase_completion_lock);
goto again;
} else {
/* Eep. All were empty */
D1(printk(KERN_NOTICE "jffs2: No clean, dirty _or_ erasable blocks to GC from! Where are they all?\n"));
return NULL;
}
ret = list_entry(nextlist->next, struct jffs2_eraseblock, list);
list_del(&ret->list);
c->gcblock = ret;
ret->gc_node = ret->first_node;
if (!ret->gc_node) {
printk(KERN_WARNING "Eep. ret->gc_node for block at 0x%08x is NULL\n", ret->offset);
BUG();
}
/* Have we accidentally picked a clean block with wasted space ? */
if (ret->wasted_size) {
D1(printk(KERN_DEBUG "Converting wasted_size %08x to dirty_size\n", ret->wasted_size));
ret->dirty_size += ret->wasted_size;
c->wasted_size -= ret->wasted_size;
c->dirty_size += ret->wasted_size;
ret->wasted_size = 0;
}
return ret;
}