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 03f7502072d9acab6c98fd688b0ecb4e708bb1e2..0f30891669108f1a13d9eb544ce1b4910e1b0f02 100644 (file)
--- a/lunaix-os/kernel/fs/pcache.c
+++ b/lunaix-os/kernel/fs/pcache.c
@@ -11,13 +11,21 @@
 
 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);
-    pcache_zone = lru_new_zone();
+    pcache_zone = lru_new_zone(__pcache_try_evict);
 }
 
 void
@@ -32,26 +40,14 @@ pcache_release_page(struct pcache* pcache, struct pcache_pg* page)
     pcache->n_pages--;
 }
 
-void
-pcache_evict(struct pcache* pcache)
-{
-    struct pcache_pg* page =
-      container_of(lru_evict_one(pcache_zone), struct pcache_pg, lru);
-
-    if (!page)
-        return;
-
-    pcache_invalidate(pcache, page);
-}
-
 struct pcache_pg*
-pcache_new_page(struct pcache* pcache, uint32_t index)
+pcache_new_page(struct pcache* pcache, u32_t index)
 {
     struct pcache_pg* ppg = vzalloc(sizeof(struct pcache_pg));
     void* pg = valloc(PG_SIZE);
 
     if (!ppg || !pg) {
-        pcache_evict(pcache);
+        lru_evict_one(pcache_zone);
         if (!ppg && !(ppg = vzalloc(sizeof(struct pcache_pg)))) {
             return NULL;
         }
@@ -62,6 +58,7 @@ pcache_new_page(struct pcache* pcache, uint32_t index)
     }
 
     ppg->pg = pg;
+    ppg->holder = pcache;
 
     llist_append(&pcache->pages, &ppg->pg_list);
     btrie_set(&pcache->tree, index, ppg);
@@ -79,17 +76,18 @@ pcache_set_dirty(struct pcache* pcache, struct pcache_pg* pg)
     }
 }
 
-struct pcache_pg*
+int
 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;
-    *offset = index & ((1 << pcache->tree.truncated) - 1);
+    u32_t mask = ((1 << pcache->tree.truncated) - 1);
+    *offset = index & mask;
     if (!pg && (pg = pcache_new_page(pcache, index))) {
-        pg->fpos = index - *offset;
+        pg->fpos = index & ~mask;
         pcache->n_pages++;
         is_new = 1;
     }
@@ -100,9 +98,9 @@ pcache_get_page(struct pcache* pcache,
 }
 
 int
-pcache_write(struct v_inode* inode, 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;
+    u32_t pg_off, buf_off = 0;
     struct pcache* pcache = inode->pg_cache;
     struct pcache_pg* pg;
 
@@ -112,11 +110,12 @@ pcache_write(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos)
             return ENOMEM;
         }
 
-        uint32_t wr_bytes = MIN(PG_SIZE - pg_off, len - buf_off);
+        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);
 
+        pg->len = pg_off + wr_bytes;
         buf_off += wr_bytes;
         fpos += wr_bytes;
     }
@@ -125,9 +124,9 @@ pcache_write(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos)
 }
 
 int
-pcache_read(struct v_inode* inode, 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;
     struct pcache* pcache = inode->pg_cache;
     struct pcache_pg* pg;
@@ -140,15 +139,21 @@ pcache_read(struct v_inode* inode, void* data, uint32_t len, uint32_t fpos)
             }
 
             // Filling up the page
-            errno = inode->default_fops.read(inode, 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
-                len = buf_off + errno;
+                len = MIN(len, buf_off + errno);
             } 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;
@@ -164,7 +169,7 @@ pcache_release(struct pcache* pcache)
     struct pcache_pg *pos, *n;
     llist_for_each(pos, n, &pcache->pages, pg_list)
     {
-        lru_remove(&pos->lru);
+        lru_remove(pcache_zone, &pos->lru);
         vfree(pos);
     }
 
@@ -178,7 +183,8 @@ pcache_commit(struct v_inode* inode, struct pcache_pg* page)
         return;
     }
 
-    int errno = inode->default_fops.write(inode, 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;
@@ -192,6 +198,10 @@ pcache_commit(struct v_inode* inode, struct pcache_pg* page)
 void
 pcache_commit_all(struct v_inode* inode)
 {
+    if (!inode->pg_cache) {
+        return;
+    }
+
     struct pcache* cache = inode->pg_cache;
     struct pcache_pg *pos, *n;