9p: VFS switches for 9p2000.L: VFS switches

Implements VFS switches for 9p2000.L protocol.

Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

5 files changed, 97 insertions, 13 deletions

diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index ed835836e0d..32ef4009d03 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -40,7 +40,9 @@
 extern struct file_system_type v9fs_fs_type;
 extern const struct address_space_operations v9fs_addr_operations;
 extern const struct file_operations v9fs_file_operations;
+extern const struct file_operations v9fs_file_operations_dotl;
 extern const struct file_operations v9fs_dir_operations;
+extern const struct file_operations v9fs_dir_operations_dotl;
 extern const struct dentry_operations v9fs_dentry_operations;
 extern const struct dentry_operations v9fs_cached_dentry_operations;
 
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 0adfd64dfce..d61e3b28ce3 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -203,3 +203,11 @@ const struct file_operations v9fs_dir_operations = {
         .open = v9fs_file_open,
         .release = v9fs_dir_release,
 };
+
+const struct file_operations v9fs_dir_operations_dotl = {
+        .read = generic_read_dir,
+        .llseek = generic_file_llseek,
+        .readdir = v9fs_dir_readdir,
+        .open = v9fs_file_open,
+        .release = v9fs_dir_release,
+};
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index df52d488d2a..25b300e1c9d 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -296,3 +296,14 @@ const struct file_operations v9fs_file_operations = {
         .mmap = generic_file_readonly_mmap,
         .fsync = v9fs_file_fsync,
 };
+
+const struct file_operations v9fs_file_operations_dotl = {
+        .llseek = generic_file_llseek,
+        .read = v9fs_file_read,
+        .write = v9fs_file_write,
+        .open = v9fs_file_open,
+        .release = v9fs_dir_release,
+        .lock = v9fs_file_lock,
+        .mmap = generic_file_readonly_mmap,
+        .fsync = v9fs_file_fsync,
+};
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index f2434fc9d2c..13a8ed6088b 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -44,9 +44,12 @@
 #include "cache.h"
 
 static const struct inode_operations v9fs_dir_inode_operations;
-static const struct inode_operations v9fs_dir_inode_operations_ext;
+static const struct inode_operations v9fs_dir_inode_operations_dotu;
+static const struct inode_operations v9fs_dir_inode_operations_dotl;
 static const struct inode_operations v9fs_file_inode_operations;
+static const struct inode_operations v9fs_file_inode_operations_dotl;
 static const struct inode_operations v9fs_symlink_inode_operations;
+static const struct inode_operations v9fs_symlink_inode_operations_dotl;
 
 /**
  * unixmode2p9mode - convert unix mode bits to plan 9
@@ -275,25 +278,44 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
                 break;
         case S_IFREG:
-                inode->i_op = &v9fs_file_inode_operations;
-                inode->i_fop = &v9fs_file_operations;
+                if (v9fs_proto_dotl(v9ses)) {
+                        inode->i_op = &v9fs_file_inode_operations_dotl;
+                        inode->i_fop = &v9fs_file_operations_dotl;
+                } else {
+                        inode->i_op = &v9fs_file_inode_operations;
+                        inode->i_fop = &v9fs_file_operations;
+                }
+
                 break;
+
         case S_IFLNK:
-                if (!v9fs_proto_dotu(v9ses)) {
-                        P9_DPRINTK(P9_DEBUG_ERROR,
-                                   "extended modes used w/o 9P2000.u\n");
+                if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
+                        P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
+                                                "legacy protocol.\n");
                         err = -EINVAL;
                         goto error;
                 }
-                inode->i_op = &v9fs_symlink_inode_operations;
+
+                if (v9fs_proto_dotl(v9ses))
+                        inode->i_op = &v9fs_symlink_inode_operations_dotl;
+                else
+                        inode->i_op = &v9fs_symlink_inode_operations;
+
                 break;
         case S_IFDIR:
                 inc_nlink(inode);
-                if (v9fs_proto_dotu(v9ses))
-                        inode->i_op = &v9fs_dir_inode_operations_ext;
+                if (v9fs_proto_dotl(v9ses))
+                        inode->i_op = &v9fs_dir_inode_operations_dotl;
+                else if (v9fs_proto_dotu(v9ses))
+                        inode->i_op = &v9fs_dir_inode_operations_dotu;
                 else
                         inode->i_op = &v9fs_dir_inode_operations;
-                inode->i_fop = &v9fs_dir_operations;
+
+                if (v9fs_proto_dotl(v9ses))
+                        inode->i_fop = &v9fs_dir_operations_dotl;
+                else
+                        inode->i_fop = &v9fs_dir_operations;
+
                 break;
         default:
                 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
@@ -1208,7 +1230,21 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
         return retval;
 }
 
-static const struct inode_operations v9fs_dir_inode_operations_ext = {
+static const struct inode_operations v9fs_dir_inode_operations_dotu = {
+        .create = v9fs_vfs_create,
+        .lookup = v9fs_vfs_lookup,
+        .symlink = v9fs_vfs_symlink,
+        .link = v9fs_vfs_link,
+        .unlink = v9fs_vfs_unlink,
+        .mkdir = v9fs_vfs_mkdir,
+        .rmdir = v9fs_vfs_rmdir,
+        .mknod = v9fs_vfs_mknod,
+        .rename = v9fs_vfs_rename,
+        .getattr = v9fs_vfs_getattr,
+        .setattr = v9fs_vfs_setattr,
+};
+
+static const struct inode_operations v9fs_dir_inode_operations_dotl = {
         .create = v9fs_vfs_create,
         .lookup = v9fs_vfs_lookup,
         .symlink = v9fs_vfs_symlink,
@@ -1239,6 +1275,11 @@ static const struct inode_operations v9fs_file_inode_operations = {
         .setattr = v9fs_vfs_setattr,
 };
 
+static const struct inode_operations v9fs_file_inode_operations_dotl = {
+        .getattr = v9fs_vfs_getattr,
+        .setattr = v9fs_vfs_setattr,
+};
+
 static const struct inode_operations v9fs_symlink_inode_operations = {
         .readlink = generic_readlink,
         .follow_link = v9fs_vfs_follow_link,
@@ -1246,3 +1287,11 @@ static const struct inode_operations v9fs_symlink_inode_operations = {
         .getattr = v9fs_vfs_getattr,
         .setattr = v9fs_vfs_setattr,
 };
+
+static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
+        .readlink = generic_readlink,
+        .follow_link = v9fs_vfs_follow_link,
+        .put_link = v9fs_vfs_put_link,
+        .getattr = v9fs_vfs_getattr,
+        .setattr = v9fs_vfs_setattr,
+};
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 806da5d3b3a..cc3fa8c3aab 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -45,7 +45,7 @@
 #include "v9fs_vfs.h"
 #include "fid.h"
 
-static const struct super_operations v9fs_super_ops;
+static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
 
 /**
  * v9fs_set_super - set the superblock
@@ -76,7 +76,10 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
         sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
         sb->s_blocksize = 1 << sb->s_blocksize_bits;
         sb->s_magic = V9FS_MAGIC;
-        sb->s_op = &v9fs_super_ops;
+        if (v9fs_proto_dotl(v9ses))
+                sb->s_op = &v9fs_super_ops_dotl;
+        else
+                sb->s_op = &v9fs_super_ops;
         sb->s_bdi = &v9ses->bdi;
 
         sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
@@ -222,6 +225,17 @@ static const struct super_operations v9fs_super_ops = {
         .umount_begin = v9fs_umount_begin,
 };
 
+static const struct super_operations v9fs_super_ops_dotl = {
+#ifdef CONFIG_9P_FSCACHE
+        .alloc_inode = v9fs_alloc_inode,
+        .destroy_inode = v9fs_destroy_inode,
+#endif
+        .statfs = simple_statfs,
+        .clear_inode = v9fs_clear_inode,
+        .show_options = generic_show_options,
+        .umount_begin = v9fs_umount_begin,
+};
+
 struct file_system_type v9fs_fs_type = {
         .name = "9p",
         .get_sb = v9fs_get_sb,