#include <lunaix/ds/btrie.h>
#include <lunaix/fs.h>
#include <lunaix/mm/page.h>
-#include <lunaix/mm/pmm.h>
#include <lunaix/mm/valloc.h>
-#include <lunaix/mm/vmm.h>
#include <lunaix/spike.h>
+#include <lunaix/bcache.h>
+#include <lunaix/syslog.h>
-#define PCACHE_DIRTY 0x1
+LOG_MODULE("pcache")
+
+#define pcache_obj(bcache) container_of(bcache, struct pcache, cache)
+
+void pcache_release_page(struct pcache* pcache, struct pcache_pg* page);
+void pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg);
+
+static bcache_zone_t pagecached_zone = NULL;
+
+static void
+__pcache_sync(struct bcache* bc, unsigned long tag, void* data)
+{
+ struct pcache* cache;
+
+ cache = pcache_obj(bc);
+ pcache_commit(cache->master, (struct pcache_pg*)data);
+}
+
+static void
+__pcache_try_release(struct bcache* bc, void* data)
+{
+ struct pcache_pg* page;
+
+ page = (struct pcache_pg*)data;
+ pcache_release_page(pcache_obj(bc), page);
+}
+
+static struct bcache_ops cache_ops = {
+ .release_on_evict = __pcache_try_release,
+ .sync_cached = __pcache_sync
+};
+
+static void*
+pcache_alloc_page()
+{
+ int i = 0;
+ ptr_t va = 0;
+ struct leaflet* leaflet = alloc_leaflet(0);
+
+ if (!leaflet) {
+ return NULL;
+ }
+
+ if (!(va = (ptr_t)vmap(leaflet, KERNEL_DATA))) {
+ leaflet_return(leaflet);
+ return NULL;
+ }
+
+ return (void*)va;
+}
+
+static void
+pcache_free_page(void* va)
+{
+ pte_t* ptep = mkptep_va(VMS_SELF, (ptr_t)va);
+ pte_t pte = pte_at(ptep);
+ leaflet_return(pte_leaflet(pte));
+}
void
pcache_init(struct pcache* pcache)
{
- btrie_init(&pcache->tree, PG_SIZE_BITS);
+ if (unlikely(!pagecached_zone)) {
+ pagecached_zone = bcache_create_zone("pcache");
+ }
+
llist_init_head(&pcache->dirty);
- llist_init_head(&pcache->pages);
+
+ bcache_init_zone(&pcache->cache, pagecached_zone, 4, -1,
+ sizeof(struct pcache_pg), &cache_ops);
}
void
pcache_release_page(struct pcache* pcache, struct pcache_pg* page)
{
- pmm_free_page(KERNEL_PID, page->pg);
- vmm_del_mapping(PD_REFERENCED, page->pg);
-
- llist_delete(&page->pg_list);
+ pcache_free_page(page->data);
vfree(page);
}
struct pcache_pg*
-pcache_new_page(struct pcache* pcache, uint32_t index)
+pcache_new_page(struct pcache* pcache)
{
- void* pg = pmm_alloc_page(KERNEL_PID, 0);
- void* pg_v = vmm_vmap(pg, PG_SIZE, PG_PREM_URW);
- struct pcache_pg* ppg = vzalloc(sizeof(struct pcache_pg));
- ppg->pg = pg_v;
+ struct pcache_pg* ppg;
+ void* data_page;
+
+ data_page = pcache_alloc_page();
+ if (!data_page) {
+ return NULL;
+ }
- llist_append(&pcache->pages, &ppg->pg_list);
- btrie_set(&pcache->tree, index, ppg);
+ ppg = vzalloc(sizeof(struct pcache_pg));
+ ppg->data = data_page;
return ppg;
}
void
pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg)
{
- if (!(pg->flags & PCACHE_DIRTY)) {
- pg->flags |= PCACHE_DIRTY;
- pcache->n_dirty++;
- llist_append(&pcache->dirty, &pg->dirty_list);
+ if (pg->dirty) {
+ return;
}
+
+ pg->dirty = true;
+ pcache->n_dirty++;
+ llist_append(&pcache->dirty, &pg->dirty_list);
}
-struct pcache_pg*
-pcache_get_page(struct pcache* pcache,
- uint32_t index,
- uint32_t* offset,
- struct pcache_pg** page)
+static bcobj_t
+__getpage_and_lock(struct pcache* pcache, unsigned int tag,
+ struct pcache_pg** page)
{
- struct pcache_pg* pg = btrie_get(&pcache->tree, index);
- int is_new = 0;
- *offset = index & ((1 << pcache->tree.truncated) - 1);
- if (!pg) {
- pg = pcache_new_page(pcache, index);
- pg->fpos = index - *offset;
- pcache->n_pages++;
- is_new = 1;
+ bcobj_t cobj;
+ struct pcache_pg* pg;
+
+ if (bcache_tryget(&pcache->cache, tag, &cobj))
+ {
+ *page = (struct pcache_pg*)bcached_data(cobj);
+ return cobj;
+ }
+
+ pg = pcache_new_page(pcache);
+ if (pg) {
+ pg->index = tag;
}
+
*page = pg;
- return is_new;
+
+ return NULL;
+}
+
+static inline int
+__fill_page(struct v_inode* inode, struct pcache_pg* pg, unsigned int index)
+{
+ return inode->default_fops->read_page(inode, pg->data, page_addr(index));
}
int
-pcache_write(struct v_file* file, void* data, uint32_t len, uint32_t fpos)
+pcache_write(struct v_inode* inode, void* data, u32_t len, u32_t fpos)
{
- uint32_t pg_off, buf_off = 0;
- struct pcache* pcache = file->inode->pg_cache;
+ int errno = 0;
+ unsigned int tag, off, wr_cnt;
+ unsigned int end = fpos + len;
+ struct pcache* pcache;
struct pcache_pg* pg;
+ bcobj_t obj;
+
+ pcache = inode->pg_cache;
+
+ while (fpos < end && errno >= 0) {
+ tag = pfn(fpos);
+ off = va_offset(fpos);
+ wr_cnt = MIN(end - fpos, PAGE_SIZE - off);
- while (buf_off < len) {
- pcache_get_page(pcache, fpos, &pg_off, &pg);
- uint32_t wr_bytes = MIN(PG_SIZE - pg_off, len - buf_off);
- memcpy(pg->pg + pg_off, (data + buf_off), wr_bytes);
+ obj = __getpage_and_lock(pcache, tag, &pg);
+
+ if (!obj && !pg) {
+ errno = inode->default_fops->write(inode, data, fpos, wr_cnt);
+ goto cont;
+ }
+ // new page and unaligned write, then prepare for partial override
+ if (!obj && wr_cnt != PAGE_SIZE) {
+ errno = __fill_page(inode, pg, tag);
+ if (errno < 0) {
+ return errno;
+ }
+ }
+
+ memcpy(offset(pg->data, off), data, wr_cnt);
pcache_set_dirty(pcache, pg);
- buf_off += wr_bytes;
- fpos += wr_bytes;
+ if (obj) {
+ bcache_return(obj);
+ } else {
+ bcache_put(&pcache->cache, tag, pg);
+ }
+
+cont:
+ data = offset(data, wr_cnt);
+ fpos += wr_cnt;
}
- return buf_off;
+ return errno < 0 ? errno : (int)(len - (end - fpos));
}
int
-pcache_read(struct v_file* file, void* data, uint32_t len, uint32_t fpos)
+pcache_read(struct v_inode* inode, void* data, u32_t len, u32_t fpos)
{
- uint32_t pg_off, buf_off = 0, new_pg = 0;
int errno = 0;
- struct pcache* pcache = file->inode->pg_cache;
+ unsigned int tag, off, rd_cnt;
+ unsigned int end = fpos + len, size = 0;
+ struct pcache* pcache;
struct pcache_pg* pg;
- struct v_inode* inode = file->inode;
-
- while (buf_off < len) {
- if (pcache_get_page(pcache, fpos, &pg_off, &pg)) {
- // Filling up the page
- errno = inode->default_fops.read(file, pg->pg, PG_SIZE, pg->fpos);
- if (errno >= 0 && errno < PG_SIZE) {
- // EOF
- len = buf_off + errno;
- } else if (errno < 0) {
- break;
+ bcobj_t obj;
+
+ pcache = inode->pg_cache;
+
+ while (fpos < page_upaligned(end)) {
+ tag = pfn(fpos);
+ off = va_offset(fpos);
+
+ obj = __getpage_and_lock(pcache, tag, &pg);
+
+ if (!obj) {
+ errno = __fill_page(inode, pg, tag);
+ if (errno < 0) {
+ return errno;
}
+
+ end -= (PAGE_SIZE - errno);
}
- uint32_t rd_bytes = MIN(PG_SIZE - pg_off, len - buf_off);
- memcpy((data + buf_off), pg->pg + pg_off, rd_bytes);
- buf_off += rd_bytes;
- fpos += rd_bytes;
+ rd_cnt = MIN(end - fpos, PAGE_SIZE - off);
+ memcpy(data, pg->data + off, rd_cnt);
+
+ if (obj) {
+ bcache_return(obj);
+ } else {
+ bcache_put(&pcache->cache, tag, pg);
+ }
+
+ data += rd_cnt;
+ size += rd_cnt;
+ fpos = page_aligned(fpos + PAGE_SIZE);
}
- return errno < 0 ? errno : buf_off;
+ return errno < 0 ? errno : (int)size;
}
void
pcache_release(struct pcache* pcache)
{
- struct pcache_pg *pos, *n;
- llist_for_each(pos, n, &pcache->pages, pg_list)
- {
- vfree(pos);
- }
-
- btrie_release(&pcache->tree);
+ bcache_free(&pcache->cache);
}
int
-pcache_commit(struct v_file* file, struct pcache_pg* page)
+pcache_commit(struct v_inode* inode, struct pcache_pg* page)
{
- if (!(page->flags & PCACHE_DIRTY)) {
- return;
+ if (!page->dirty) {
+ return 0;
}
- struct v_inode* inode = file->inode;
- int errno = inode->default_fops.write(file, page->pg, PG_SIZE, page->fpos);
-
+ int errno;
+ unsigned int fpos = page_addr(page->index);
+
+ errno = inode->default_fops->write_page(inode, page->data, fpos);
if (!errno) {
- page->flags &= ~PCACHE_DIRTY;
+ page->dirty = false;
llist_delete(&page->dirty_list);
- file->inode->pg_cache->n_dirty--;
+ inode->pg_cache->n_dirty--;
}
return errno;
}
void
-pcache_commit_all(struct v_file* file)
+pcache_commit_all(struct v_inode* inode)
{
- struct pcache* cache = file->inode->pg_cache;
+ struct pcache* cache = inode->pg_cache;
+ if (!cache) {
+ return;
+ }
+
struct pcache_pg *pos, *n;
llist_for_each(pos, n, &cache->dirty, dirty_list)
{
- pcache_commit(file, pos);
+ pcache_commit(inode, pos);
}
-}
-
-void
-pcache_invalidate(struct v_file* file, struct pcache_pg* page)
-{
- pcache_commit(file, page);
- pcache_release_page(&file->inode->pg_cache, page);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff