9p: Implement LOPEN

Implement 9p2000.L version of open(LOPEN) interface in 9p client.

For LOPEN, no need to convert the flags to and from 9p mode to VFS mode.

Synopsis:

    size[4] Tlopen tag[2] fid[4] mode[4]

    size[4] Rlopen tag[2] qid[13] iounit[4]

[Fix mode bit format - jvrao@linux.vnet.ibm.com]

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbegren <ericvh@gmail.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 2d686ec322a..e97c92bd6f1 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -59,9 +59,13 @@ int v9fs_file_open(struct inode *inode, struct file *file)
         struct p9_fid *fid;
         int omode;
 
-        P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
+        P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
         v9ses = v9fs_inode2v9ses(inode);
-        omode = v9fs_uflags2omode(file->f_flags, v9fs_proto_dotu(v9ses));
+        if (v9fs_proto_dotl(v9ses))
+                omode = file->f_flags;
+        else
+                omode = v9fs_uflags2omode(file->f_flags,
+                                        v9fs_proto_dotu(v9ses));
         fid = file->private_data;
         if (!fid) {
                 fid = v9fs_fid_clone(file->f_path.dentry);
@@ -73,11 +77,12 @@ int v9fs_file_open(struct inode *inode, struct file *file)
                         p9_client_clunk(fid);
                         return err;
                 }
-                if (omode & P9_OTRUNC) {
+                if (file->f_flags & O_TRUNC) {
                         i_size_write(inode, 0);
                         inode->i_blocks = 0;
                 }
-                if ((file->f_flags & O_APPEND) && (!v9fs_proto_dotu(v9ses)))
+                if ((file->f_flags & O_APPEND) &&
+                        (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
                         generic_file_llseek(file, 0, SEEK_END);
         }