refactor: separate syscall interfaces from kernel space, into posix compliant structure.

[lunaix-os.git] / lunaix-os / kernel / fs / pcache.c

diff --git a/lunaix-os/kernel/fs/pcache.c b/lunaix-os/kernel/fs/pcache.c
index 3db75718592896c96b0968c73c70b84dd2760240..0f30891669108f1a13d9eb544ce1b4910e1b0f02 100644 (file)
--- a/lunaix-os/kernel/fs/pcache.c
+++ b/lunaix-os/kernel/fs/pcache.c
@@ -9,19 +9,29 @@
 
 #define PCACHE_DIRTY 0x1
 
 
 #define PCACHE_DIRTY 0x1
 

+static struct lru_zone* pcache_zone;
+
+static int
+__pcache_try_evict(struct lru_node* obj)
+{
+    struct pcache_pg* page = container_of(obj, struct pcache_pg, lru);
+    pcache_invalidate(page->holder, page);
+    return 1;
+}
+

 void
 pcache_init(struct pcache* pcache)
 {
     btrie_init(&pcache->tree, PG_SIZE_BITS);
     llist_init_head(&pcache->dirty);
     llist_init_head(&pcache->pages);
 void
 pcache_init(struct pcache* pcache)
 {
     btrie_init(&pcache->tree, PG_SIZE_BITS);
     llist_init_head(&pcache->dirty);
     llist_init_head(&pcache->pages);

+    pcache_zone = lru_new_zone(__pcache_try_evict);

 }
 
 void
 pcache_release_page(struct pcache* pcache, struct pcache_pg* page)
 {
 }
 
 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);
+    vfree(page->pg);

 
     llist_delete(&page->pg_list);
 
 
     llist_delete(&page->pg_list);
 


@@ -31,12 +41,24 @@ pcache_release_page(struct pcache* pcache, struct pcache_pg* page)
 }
 
 struct pcache_pg*
 }
 
 struct pcache_pg*

-pcache_new_page(struct pcache* pcache, uint32_t index)
+pcache_new_page(struct pcache* pcache, u32_t index)

 {
 {

-    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));
     struct pcache_pg* ppg = vzalloc(sizeof(struct pcache_pg));

-    ppg->pg = pg_v;
+    void* pg = valloc(PG_SIZE);
+
+    if (!ppg || !pg) {
+        lru_evict_one(pcache_zone);
+        if (!ppg && !(ppg = vzalloc(sizeof(struct pcache_pg)))) {
+            return NULL;
+        }
+
+        if (!pg && !(pg = valloc(PG_SIZE))) {
+            return NULL;
+        }
+    }
+
+    ppg->pg = pg;
+    ppg->holder = pcache;

 
     llist_append(&pcache->pages, &ppg->pg_list);
     btrie_set(&pcache->tree, index, ppg);
 
     llist_append(&pcache->pages, &ppg->pg_list);
     btrie_set(&pcache->tree, index, ppg);


@@ -54,39 +76,46 @@ pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg)
     }
 }
 
     }
 }
 

-struct pcache_pg*
+int

 pcache_get_page(struct pcache* pcache,
 pcache_get_page(struct pcache* pcache,

-                uint32_t index,
-                uint32_t* offset,
+                u32_t index,
+                u32_t* offset,

                 struct pcache_pg** page)
 {
     struct pcache_pg* pg = btrie_get(&pcache->tree, index);
     int is_new = 0;
                 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;
+    u32_t mask = ((1 << pcache->tree.truncated) - 1);
+    *offset = index & mask;
+    if (!pg && (pg = pcache_new_page(pcache, index))) {
+        pg->fpos = index & ~mask;

         pcache->n_pages++;
         is_new = 1;
     }
         pcache->n_pages++;
         is_new = 1;
     }

+    if (pg)
+        lru_use_one(pcache_zone, &pg->lru);

     *page = pg;
     return is_new;
 }
 
 int
     *page = pg;
     return is_new;
 }
 
 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;
+    u32_t pg_off, buf_off = 0;
+    struct pcache* pcache = inode->pg_cache;

     struct pcache_pg* pg;
 
     while (buf_off < len) {
         pcache_get_page(pcache, fpos, &pg_off, &pg);
     struct pcache_pg* pg;
 
     while (buf_off < len) {
         pcache_get_page(pcache, fpos, &pg_off, &pg);

-        uint32_t wr_bytes = MIN(PG_SIZE - pg_off, len - buf_off);
+        if (!pg) {
+            return ENOMEM;
+        }
+
+        u32_t wr_bytes = MIN(PG_SIZE - pg_off, len - buf_off);

         memcpy(pg->pg + pg_off, (data + buf_off), wr_bytes);
 
         pcache_set_dirty(pcache, pg);
 
         memcpy(pg->pg + pg_off, (data + buf_off), wr_bytes);
 
         pcache_set_dirty(pcache, pg);
 

+        pg->len = pg_off + wr_bytes;

         buf_off += wr_bytes;
         fpos += wr_bytes;
     }
         buf_off += wr_bytes;
         fpos += wr_bytes;
     }


@@ -95,26 +124,36 @@ pcache_write(struct v_file* file, void* data, uint32_t len, uint32_t fpos)
 }
 
 int
 }
 
 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;
+    u32_t pg_off, buf_off = 0, new_pg = 0;

     int errno = 0;
     int errno = 0;

-    struct pcache* pcache = file->inode->pg_cache;
+    struct pcache* pcache = inode->pg_cache;

     struct pcache_pg* pg;
     struct pcache_pg* pg;

-    struct v_inode* inode = file->inode;

 
     while (buf_off < len) {
         if (pcache_get_page(pcache, fpos, &pg_off, &pg)) {
 
     while (buf_off < len) {
         if (pcache_get_page(pcache, fpos, &pg_off, &pg)) {

+
+            if (!pg) {
+                return ENOMEM;
+            }
+

             // Filling up the page
             // Filling up the page

-            errno = inode->default_fops.read(file, pg->pg, PG_SIZE, pg->fpos);
+            errno =
+              inode->default_fops->read_page(inode, pg->pg, PG_SIZE, pg->fpos);

             if (errno >= 0 && errno < PG_SIZE) {
                 // EOF
             if (errno >= 0 && errno < PG_SIZE) {
                 // EOF

-                len = buf_off + errno;
+                len = MIN(len, buf_off + errno);

             } else if (errno < 0) {
                 break;
             }
             } else if (errno < 0) {
                 break;
             }

+            pg->len = errno;

         }
         }

-        uint32_t rd_bytes = MIN(PG_SIZE - pg_off, len - buf_off);
+        u32_t rd_bytes = MIN(pg->len - pg_off, len - buf_off);
+
+        if (!rd_bytes)
+            break;
+

         memcpy((data + buf_off), pg->pg + pg_off, rd_bytes);
 
         buf_off += rd_bytes;
         memcpy((data + buf_off), pg->pg + pg_off, rd_bytes);
 
         buf_off += rd_bytes;


@@ -130,6 +169,7 @@ pcache_release(struct pcache* pcache)
     struct pcache_pg *pos, *n;
     llist_for_each(pos, n, &pcache->pages, pg_list)
     {
     struct pcache_pg *pos, *n;
     llist_for_each(pos, n, &pcache->pages, pg_list)
     {

+        lru_remove(pcache_zone, &pos->lru);

         vfree(pos);
     }
 
         vfree(pos);
     }
 


@@ -137,38 +177,43 @@ pcache_release(struct pcache* pcache)
 }
 
 int
 }
 
 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->flags & PCACHE_DIRTY)) {
         return;
     }
 

-    struct v_inode* inode = file->inode;
-    int errno = inode->default_fops.write(file, page->pg, PG_SIZE, page->fpos);
+    int errno =
+      inode->default_fops->write_page(inode, page->pg, PG_SIZE, page->fpos);

 
     if (!errno) {
         page->flags &= ~PCACHE_DIRTY;
         llist_delete(&page->dirty_list);
 
     if (!errno) {
         page->flags &= ~PCACHE_DIRTY;
         llist_delete(&page->dirty_list);

-        file->inode->pg_cache->n_dirty--;
+        inode->pg_cache->n_dirty--;

     }
 
     return errno;
 }
 
 void
     }
 
     return errno;
 }
 
 void

-pcache_commit_all(struct v_file* file)
+pcache_commit_all(struct v_inode* inode)

 {
 {

-    struct pcache* cache = file->inode->pg_cache;
+    if (!inode->pg_cache) {
+        return;
+    }
+
+    struct pcache* cache = inode->pg_cache;

     struct pcache_pg *pos, *n;
     struct pcache_pg *pos, *n;

+

     llist_for_each(pos, n, &cache->dirty, dirty_list)
     {
     llist_for_each(pos, n, &cache->dirty, dirty_list)
     {

-        pcache_commit(file, pos);
+        pcache_commit(inode, pos);

     }
 }
 
 void
     }
 }
 
 void

-pcache_invalidate(struct v_file* file, struct pcache_pg* page)
+pcache_invalidate(struct pcache* pcache, struct pcache_pg* page)

 {
 {

-    pcache_commit(file, page);
-    pcache_release_page(&file->inode->pg_cache, page);
+    pcache_commit(pcache->master, page);
+    pcache_release_page(pcache, page);

 }
\ No newline at end of file
 }
\ No newline at end of file