refactor: restructure the user space stuff.

[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 9d883f90485402f702617dbd8a721040315d925b..d3e871eadc9e0ae831c3673e96d2366b2cedbca7 100644 (file)
--- a/lunaix-os/kernel/fs/pcache.c
+++ b/lunaix-os/kernel/fs/pcache.c
@@ -41,7 +41,7 @@ pcache_release_page(struct pcache* pcache, struct pcache_pg* 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);
@@ -76,17 +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;
     }
@@ -97,9 +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;
 
@@ -109,11 +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;
     }
@@ -122,9 +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;
@@ -137,22 +139,28 @@ 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;
         fpos += rd_bytes;
     }
 
-    return errno < 0 ? errno : buf_off;
+    return errno < 0 ? errno : (int)buf_off;
 }
 
 void
@@ -172,10 +180,11 @@ int
 pcache_commit(struct v_inode* inode, struct pcache_pg* page)
 {
     if (!(page->flags & PCACHE_DIRTY)) {
-        return;
+        return 0;
     }
 
-    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;
@@ -189,6 +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;