rewrite the device subsystem interfaces (#48)

[lunaix-os.git] / lunaix-os / kernel / device / devfs.c

diff --git a/lunaix-os/kernel/device/devfs.c b/lunaix-os/kernel/device/devfs.c
index 1a49b0519ebdca9882b67baae30cf661ec6a4762..c105f66a71bbed5072e6544de25b3bea75b9c27e 100644 (file)
--- a/lunaix-os/kernel/device/devfs.c
+++ b/lunaix-os/kernel/device/devfs.c
@@ -1,5 +1,5 @@
 #include <lunaix/device.h>
-#include <lunaix/fs.h>
+#include <lunaix/fs/api.h>
 #include <lunaix/fs/devfs.h>
 #include <lunaix/spike.h>
 
@@ -13,9 +13,9 @@ devfs_read(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
 {
     assert(inode->data);
 
-    struct device* dev = (struct device*)inode->data;
+    struct device* dev = resolve_device(inode->data);
 
-    if (!dev->ops.read) {
+    if (!dev || !dev->ops.read) {
         return ENOTSUP;
     }
 
@@ -27,9 +27,9 @@ devfs_write(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
 {
     assert(inode->data);
 
-    struct device* dev = (struct device*)inode->data;
+    struct device* dev = resolve_device(inode->data);
 
-    if (!dev->ops.write) {
+    if (!dev || !dev->ops.write) {
         return ENOTSUP;
     }
 
@@ -37,13 +37,13 @@ devfs_write(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
 }
 
 int
-devfs_read_page(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
+devfs_read_page(struct v_inode* inode, void* buffer, size_t fpos)
 {
     assert(inode->data);
 
-    struct device* dev = (struct device*)inode->data;
+    struct device* dev = resolve_device(inode->data);
 
-    if (!dev->ops.read_page) {
+    if (!dev || !dev->ops.read_page) {
         return ENOTSUP;
     }
 
@@ -51,13 +51,13 @@ devfs_read_page(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
 }
 
 int
-devfs_write_page(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
+devfs_write_page(struct v_inode* inode, void* buffer, size_t fpos)
 {
     assert(inode->data);
 
-    struct device* dev = (struct device*)inode->data;
+    struct device* dev = resolve_device(inode->data);
 
-    if (!dev->ops.read_page) {
+    if (!dev || !dev->ops.read_page) {
         return ENOTSUP;
     }
 
@@ -65,45 +65,61 @@ devfs_write_page(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
 }
 
 int
-devfs_get_itype(struct device* dev)
+devfs_get_itype(morph_t* obj)
 {
-    int itype = VFS_IFFILE;
+    int itype = VFS_IFDEV;
+
+    if (morph_type_of(obj, devcat_morpher)) {
+        return VFS_IFDIR;
+    }
+
+    struct device* dev = resolve_device(obj);
+
+    if (!dev) {
+        return itype;
+    }
+    
     int dev_if = dev->dev_type & DEV_MSKIF;
-    if (dev_if == DEV_IFCAT) {
-        itype = VFS_IFDIR;
-    } else if (dev_if == DEV_IFVOL) {
+    if (dev_if == DEV_IFVOL) {
         itype |= VFS_IFVOLDEV;
-    } else if (dev_if == DEV_IFSEQ) {
-        itype |= VFS_IFSEQDEV;
-    } else {
-        itype |= VFS_IFDEV;
     }
+
+    // otherwise, the mapping is considered to be generic seq dev.
     return itype;
 }
 
-int
-devfs_get_dtype(struct device* dev)
+static inline int
+devfs_get_dtype(morph_t* dev_morph)
 {
-    switch (dev->dev_type & DEV_MSKIF) {
-        case DEV_IFCAT:
-            return DT_DIR;
+    if (morph_type_of(dev_morph, devcat_morpher)) {
+        return DT_DIR;
+    }
+    return DT_FILE;
+}
 
-        default:
-            return DT_FILE;
+static inline morph_t*
+__try_resolve(struct v_inode* inode)
+{
+    if (!inode->data) {
+        return dev_object_root;
     }
+
+    return resolve_device_morph(inode->data);
 }
 
 int
-devfs_mknod(struct v_dnode* dnode, struct device* dev)
+devfs_mknod(struct v_dnode* dnode, morph_t* obj)
 {
-    assert(dev);
+    struct v_inode* devnod;
+    
+    assert(obj);
 
-    struct v_inode* devnod = vfs_i_find(dnode->super_block, dev->dev_uid);
+    devnod = vfs_i_find(dnode->super_block, morpher_uid(obj));
     if (!devnod) {
         if ((devnod = vfs_i_alloc(dnode->super_block))) {
-            devnod->id = dev->dev_uid;
-            devnod->data = dev;
-            devnod->itype = devfs_get_itype(dev);
+            devnod->id = morpher_uid(obj);
+            devnod->data = changeling_ref(obj);
+            devnod->itype = devfs_get_itype(obj);
 
             vfs_i_addhash(devnod);
         } else {
@@ -118,24 +134,43 @@ devfs_mknod(struct v_dnode* dnode, struct device* dev)
 int
 devfs_dirlookup(struct v_inode* this, struct v_dnode* dnode)
 {
-    struct device* dev =
-      device_getbyhname((struct device*)this->data, &dnode->name);
-    if (!dev) {
+    morph_t *mobj, *root;
+
+    root = __try_resolve(this);
+    if (!root) {
+        return ENOTDIR;
+    }
+
+    mobj = changeling_find(root, &dnode->name);
+    if (!mobj) {
         return ENOENT;
     }
-    return devfs_mknod(dnode, dev);
+
+    return devfs_mknod(dnode, mobj);
 }
 
 int
 devfs_readdir(struct v_file* file, struct dir_context* dctx)
 {
-    struct device* dev =
-      device_getbyoffset((struct device*)(file->inode->data), dctx->index);
-    if (!dev) {
+    morph_t *mobj, *root;
+
+    root = __try_resolve(file->inode);
+    if (!root) {
+        return ENOTDIR;
+    }
+
+    if (fsapi_handle_pseudo_dirent(file, dctx)) {
+        return 1;
+    }
+
+    mobj = changeling_get_at(root, file->f_pos - 2);
+    if (!mobj) {
         return 0;
     }
-    dctx->read_complete_callback(
-      dctx, dev->name.value, dev->name.len, devfs_get_dtype(dev));
+
+    dctx->read_complete_callback(dctx, 
+                                 mobj->name.value, mobj->name.len, 
+                                 devfs_get_dtype(mobj));
     return 1;
 }
 
@@ -175,10 +210,11 @@ devfs_unmount(struct v_superblock* vsb)
 void
 devfs_init()
 {
-    struct filesystem* fs = fsm_new_fs("devfs", 5);
-    fsm_register(fs);
-    fs->mount = devfs_mount;
-    fs->unmount = devfs_unmount;
+    struct filesystem* fs;
+    fs = fsapi_fs_declare("devfs", FSTYPE_PSEUDO);
+    
+    fsapi_fs_set_mntops(fs, devfs_mount, devfs_unmount);
+    fsapi_fs_finalise(fs);
 }
 EXPORT_FILE_SYSTEM(devfs, devfs_init);