From a3e64ef2bf31dda9a94db011a96651de918ea968 Mon Sep 17 00:00:00 2001
From: sotech117 <michael_foiani@brown.edu>
Date: Thu, 25 Apr 2024 02:58:09 +0000
Subject: old vfs fixes

---
 kernel/fs/open.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 99 insertions(+), 2 deletions(-)

(limited to 'kernel/fs/open.c')

diff --git a/kernel/fs/open.c b/kernel/fs/open.c
index 8c9fee6..811a9c4 100644
--- a/kernel/fs/open.c
+++ b/kernel/fs/open.c
@@ -62,6 +62,103 @@ long get_empty_fd(int *fd)
  */
 long do_open(const char *filename, int oflags)
 {
-    NOT_YET_IMPLEMENTED("VFS: do_open");
-    return -1;
+    // NOT_YET_IMPLEMENTED("VFS: do_open");
+
+    // Check if oflags is valid
+    if ((oflags & O_WRONLY) && (oflags & O_RDWR))
+    {
+        return -EINVAL;
+    }
+
+    // Get an empty file descriptor
+    int fd = -1;
+    long ret = get_empty_fd(&fd);
+    if (ret < 0)
+    {
+        return ret;
+    }
+
+    // Check if the file is a directory
+    if (filename[strlen(filename) - 1] == '/' && (oflags & O_WRONLY))
+    {
+        return -EISDIR;
+    }
+
+    // Open the file
+    vnode_t *res_vnode = NULL;
+    vnode_t *base = curproc->p_cwd;
+    ret = namev_open(base, filename, oflags, S_IFREG, 0, &res_vnode);
+    if (ret < 0)
+    {
+        if (res_vnode != NULL)
+        {
+            vput(&res_vnode);
+        }
+        return ret;
+    }
+
+    // Check if the vnode is a directory
+    if (S_ISDIR(res_vnode->vn_mode) && ((oflags & O_WRONLY) || (oflags & O_RDWR)))
+    {
+        return -EISDIR;
+    }
+
+    // Check if the vnode is a blockdev or chardev
+    if (S_ISCHR(res_vnode->vn_mode) && res_vnode->vn_dev.chardev == NULL)
+    {
+        vput(&res_vnode);
+        return -ENXIO;
+    }
+    if (S_ISBLK(res_vnode->vn_mode) && res_vnode->vn_dev.blockdev == NULL)
+    {
+        vput(&res_vnode);
+        return -ENXIO;
+    }
+
+    // Convert oflags to file access flags
+    int fmode = 0;
+    if (oflags & O_RDONLY)
+    {
+        fmode |= FMODE_READ;
+    }
+
+    if (oflags & O_WRONLY)
+    {
+        fmode |= FMODE_WRITE;
+    }
+    else
+    {
+        fmode |= FMODE_READ;
+    }
+
+    if (oflags & O_RDWR)
+    {
+        fmode |= FMODE_READ | FMODE_WRITE;
+    }
+
+    if (oflags & O_APPEND)
+    {
+        fmode |= FMODE_APPEND;
+    }
+    // Truncate the file if O_TRUNC is specified
+    if (oflags & O_TRUNC && S_ISREG(res_vnode->vn_mode))
+    {
+        vlock(res_vnode);
+        res_vnode->vn_ops->truncate_file(res_vnode);
+        vunlock(res_vnode);
+    }
+
+    // Create the file descriptor
+    file_t *file = fcreate(fd, res_vnode, fmode);
+    if (file == NULL)
+    {
+        vput(&res_vnode);
+        return -ENOMEM;
+    }
+
+
+    // Set the file descriptor
+    // curproc->p_files[fd] = file;
+    vput(&res_vnode);
+    return fd;
 }
-- 
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