lxfs: stub for open()

fs/lxfs/src/dirtree.c

@@ -55,4 +55,15 @@ char *pathComponent(char *dest, const char *path, int n) {
     }
 
     return NULL;
+}
+
+/* lxfsFind(): finds the directory entry associated with a file
+ * params: dest - destination buffer to store the directory entry
+ * params: mp - lxfs mountpoint
+ * params: path - full qualified path
+ * returns: pointer to destination on success, NULL on fail
+ */
+
+LXFSDirectoryEntry *lxfsFind(LXFSDirectoryEntry *dest, Mountpoint *mp, const char *path) {
+    return NULL;    // stub
 }

fs/lxfs/src/include/lxfs/lxfs.h

@@ -124,6 +124,7 @@ uint64_t lxfsWriteNextBlock(Mountpoint *, uint64_t, const void *);
 Mountpoint *findMP(const char *);
 int pathDepth(const char *);
 char *pathComponent(char *, const char *, int);
+LXFSDirectoryEntry *lxfsFind(LXFSDirectoryEntry *, Mountpoint *, const char *);
 
 void lxfsOpen(OpenCommand *);
 void lxfsStat(StatCommand *);

fs/lxfs/src/main.c

@@ -52,6 +52,7 @@ int main() {
 
             switch(msg->header.command) {
             case COMMAND_MOUNT: lxfsMount((MountCommand *) msg); break;
+            case COMMAND_OPEN: lxfsOpen((OpenCommand *) msg); break;
             default:
                 luxLogf(KPRINT_LEVEL_WARNING, "unimplemented command 0x%04X, dropping message...\n", msg->header.command);
             }

fs/lxfs/src/mount.c

@@ -32,6 +32,18 @@ static Mountpoint *allocateMP() {
     return mp;
 }
 
+Mountpoint *findMP(const char *dev) {
+    if(!mps) return NULL;
+
+    Mountpoint *list = mps;
+    while(list) {
+        if(!strcmp(list->device, dev)) return list;
+        else list = list->next;
+    }
+
+    return NULL;
+}
+
 void lxfsMount(MountCommand *cmd) {
     cmd->header.header.response = 1;
 

fs/lxfs/src/open.c

@@ -0,0 +1,41 @@
+/*
+ * luxOS - a unix-like operating system
+ * Omar Elghoul, 2024
+ * 
+ * lxfs: Driver for the lxfs file system
+ */
+
+#include <liblux/liblux.h>
+#include <lxfs/lxfs.h>
+#include <vfs.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fnctl.h>
+#include <unistd.h>
+#include <errno.h>
+
+/* lxfsOpen(): opens a opened file on an lxfs volume
+ * params: ocmd - open command message
+ * returns: nothing, response relayed to vfs
+ */
+
+void lxfsOpen(OpenCommand *ocmd) {
+    ocmd->header.header.response = 1;
+    ocmd->header.header.length = sizeof(OpenCommand);
+
+    luxLogf(KPRINT_LEVEL_DEBUG, "opening %s on %s\n", ocmd->path, ocmd->device);
+
+    Mountpoint *mp = findMP(ocmd->device);
+    if(!mp) {
+        ocmd->header.header.status = -EIO;  // device doesn't exist
+        luxSendDependency(ocmd);
+        return;
+    }
+
+    LXFSDirectoryEntry entry;
+    if(!lxfsFind(&entry, mp, ocmd->path)) {
+        ocmd->header.header.status = -ENOENT;   // file doesn't exist
+        luxSendDependency(ocmd);
+        return;
+    }
+}