#include <linux/atomic.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
-#include <linux/dcache.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/compaction.h>
#include <linux/percpu.h>
#include <linux/mount.h>
+#include <linux/pseudo_fs.h>
#include <linux/fs.h>
#include <linux/preempt.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/zpool.h>
+#include <linux/magic.h>
/*
* NCHUNKS_ORDER determines the internal allocation granularity, effectively
* @refcount: reference count for the z3fold page
* @work: work_struct for page layout optimization
* @slots: pointer to the structure holding buddy slots
+ * @pool: pointer to the containing pool
* @cpu: CPU which this page "belongs" to
* @first_chunks: the size of the first buddy in chunks, 0 if free
* @middle_chunks: the size of the middle buddy in chunks, 0 if free
struct kref refcount;
struct work_struct work;
struct z3fold_buddy_slots *slots;
+ struct z3fold_pool *pool;
short cpu;
unsigned short first_chunks;
unsigned short middle_chunks;
static inline struct z3fold_buddy_slots *alloc_slots(struct z3fold_pool *pool,
gfp_t gfp)
{
- struct z3fold_buddy_slots *slots = kmem_cache_alloc(pool->c_handle,
- gfp);
+ struct z3fold_buddy_slots *slots;
+
+ slots = kmem_cache_alloc(pool->c_handle,
+ (gfp & ~(__GFP_HIGHMEM | __GFP_MOVABLE)));
if (slots) {
memset(slots->slot, 0, sizeof(slots->slot));
}
}
-static struct dentry *z3fold_do_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int z3fold_init_fs_context(struct fs_context *fc)
{
- static const struct dentry_operations ops = {
- .d_dname = simple_dname,
- };
-
- return mount_pseudo(fs_type, "z3fold:", NULL, &ops, 0x33);
+ return init_pseudo(fc, Z3FOLD_MAGIC) ? 0 : -ENOMEM;
}
static struct file_system_type z3fold_fs = {
.name = "z3fold",
- .mount = z3fold_do_mount,
+ .init_fs_context = z3fold_init_fs_context,
.kill_sb = kill_anon_super,
};
zhdr->start_middle = 0;
zhdr->cpu = -1;
zhdr->slots = slots;
+ zhdr->pool = pool;
INIT_LIST_HEAD(&zhdr->buddy);
INIT_WORK(&zhdr->work, compact_page_work);
return zhdr;
static inline struct z3fold_pool *zhdr_to_pool(struct z3fold_header *zhdr)
{
- return slots_to_pool(zhdr->slots);
+ return zhdr->pool;
}
static void __release_z3fold_page(struct z3fold_header *zhdr, bool locked)
enum buddy bud;
bool can_sleep = gfpflags_allow_blocking(gfp);
- if (!size || (gfp & __GFP_HIGHMEM))
+ if (!size)
return -EINVAL;
if (size > PAGE_SIZE)
zhdr = page_address(page);
pool = zhdr_to_pool(zhdr);
- if (!trylock_page(page))
- return -EAGAIN;
-
if (!z3fold_page_trylock(zhdr)) {
- unlock_page(page);
return -EAGAIN;
}
if (zhdr->mapped_count != 0) {
z3fold_page_unlock(zhdr);
- unlock_page(page);
return -EBUSY;
}
+ if (work_pending(&zhdr->work)) {
+ z3fold_page_unlock(zhdr);
+ return -EAGAIN;
+ }
new_zhdr = page_address(newpage);
memcpy(new_zhdr, zhdr, PAGE_SIZE);
newpage->private = page->private;
page->private = 0;
z3fold_page_unlock(zhdr);
spin_lock_init(&new_zhdr->page_lock);
+ INIT_WORK(&new_zhdr->work, compact_page_work);
+ /*
+ * z3fold_page_isolate() ensures that new_zhdr->buddy is empty,
+ * so we only have to reinitialize it.
+ */
+ INIT_LIST_HEAD(&new_zhdr->buddy);
new_mapping = page_mapping(page);
__ClearPageMovable(page);
ClearPagePrivate(page);
queue_work_on(new_zhdr->cpu, pool->compact_wq, &new_zhdr->work);
page_mapcount_reset(page);
- unlock_page(page);
put_page(page);
return 0;
}