Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9p: Optimize TCREATE by eliminating a redundant fid clone.
  9p: cleanup: remove unneeded assignment
  9p: Add mksock support
  fs/9p: Make sure we properly instantiate dentry.
  9p: add 9P2000.L rename operation
  9p: add 9P2000.L statfs operation
  9p: VFS switches for 9p2000.L: VFS switches
  9p: VFS switches for 9p2000.L: protocol and client changes

9 files changed, 261 insertions, 33 deletions

diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index ed835836e0dc..32ef4009d030 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 0adfd64dfcee..d61e3b28ce37 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 df52d488d2a6..25b300e1c9d7 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 6d4d86187c55..4331b3b5ee1c 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
@@ -273,25 +276,44 @@ 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",
@@ -432,14 +454,12 @@ static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
 {
         int retval;
         struct inode *file_inode;
-        struct v9fs_session_info *v9ses;
         struct p9_fid *v9fid;
 
         P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
                 rmdir);
 
         file_inode = file->d_inode;
-        v9ses = v9fs_inode2v9ses(file_inode);
         v9fid = v9fs_fid_clone(file);
         if (IS_ERR(v9fid))
                 return PTR_ERR(v9fid);
@@ -482,12 +502,11 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
         ofid = NULL;
         fid = NULL;
         name = (char *) dentry->d_name.name;
-        dfid = v9fs_fid_clone(dentry->d_parent);
+        dfid = v9fs_fid_lookup(dentry->d_parent);
         if (IS_ERR(dfid)) {
                 err = PTR_ERR(dfid);
-                P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err);
-                dfid = NULL;
-                goto error;
+                P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
+                return ERR_PTR(err);
         }
 
         /* clone a fid to use for creation */
@@ -495,8 +514,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
         if (IS_ERR(ofid)) {
                 err = PTR_ERR(ofid);
                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
-                ofid = NULL;
-                goto error;
+                return ERR_PTR(err);
         }
 
         err = p9_client_fcreate(ofid, name, perm, mode, extension);
@@ -506,14 +524,13 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
         }
 
         /* now walk from the parent so we can get unopened fid */
-        fid = p9_client_walk(dfid, 1, &name, 0);
+        fid = p9_client_walk(dfid, 1, &name, 1);
         if (IS_ERR(fid)) {
                 err = PTR_ERR(fid);
                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
                 fid = NULL;
                 goto error;
-        } else
-                dfid = NULL;
+        }
 
         /* instantiate inode and assign the unopened fid to the dentry */
         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
@@ -536,9 +553,6 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
         return ofid;
 
 error:
-        if (dfid)
-                p9_client_clunk(dfid);
-
         if (ofid)
                 p9_client_clunk(ofid);
 
@@ -673,8 +687,8 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
         if (IS_ERR(fid)) {
                 result = PTR_ERR(fid);
                 if (result == -ENOENT) {
-                        d_add(dentry, NULL);
-                        return NULL;
+                        inode = NULL;
+                        goto inst_out;
                 }
 
                 return ERR_PTR(result);
@@ -691,7 +705,8 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
         if (result < 0)
                 goto error;
 
-        if ((fid->qid.version) && (v9ses->cache))
+inst_out:
+        if (v9ses->cache)
                 dentry->d_op = &v9fs_cached_dentry_operations;
         else
                 dentry->d_op = &v9fs_dentry_operations;
@@ -770,6 +785,13 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 goto clunk_olddir;
         }
 
+        if (v9fs_proto_dotl(v9ses)) {
+                retval = p9_client_rename(oldfid, newdirfid,
+                                        (char *) new_dentry->d_name.name);
+                if (retval != -ENOSYS)
+                        goto clunk_newdir;
+        }
+
         /* 9P can only handle file rename in the same directory */
         if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
                 P9_DPRINTK(P9_DEBUG_ERROR,
@@ -1195,6 +1217,8 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
                 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
         else if (S_ISFIFO(mode))
                 *name = 0;
+        else if (S_ISSOCK(mode))
+                *name = 0;
         else {
                 __putname(name);
                 return -EINVAL;
@@ -1206,7 +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,
@@ -1237,6 +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,
@@ -1244,3 +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 806da5d3b3a0..be74d020436e 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -38,6 +38,7 @@
 #include <linux/idr.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/statfs.h>
 #include <net/9p/9p.h>
 #include <net/9p/client.h>
 
@@ -45,7 +46,7 @@
 #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 +77,10 @@ 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 |
@@ -211,6 +215,42 @@ v9fs_umount_begin(struct super_block *sb)
         v9fs_session_begin_cancel(v9ses);
 }
 
+static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+        struct v9fs_session_info *v9ses;
+        struct p9_fid *fid;
+        struct p9_rstatfs rs;
+        int res;
+
+        fid = v9fs_fid_lookup(dentry);
+        if (IS_ERR(fid)) {
+                res = PTR_ERR(fid);
+                goto done;
+        }
+
+        v9ses = v9fs_inode2v9ses(dentry->d_inode);
+        if (v9fs_proto_dotl(v9ses)) {
+                res = p9_client_statfs(fid, &rs);
+                if (res == 0) {
+                        buf->f_type = rs.type;
+                        buf->f_bsize = rs.bsize;
+                        buf->f_blocks = rs.blocks;
+                        buf->f_bfree = rs.bfree;
+                        buf->f_bavail = rs.bavail;
+                        buf->f_files = rs.files;
+                        buf->f_ffree = rs.ffree;
+                        buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
+                        buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
+                        buf->f_namelen = rs.namelen;
+                }
+                if (res != -ENOSYS)
+                        goto done;
+        }
+        res = simple_statfs(dentry, buf);
+done:
+        return res;
+}
+
 static const struct super_operations v9fs_super_ops = {
 #ifdef CONFIG_9P_FSCACHE
         .alloc_inode = v9fs_alloc_inode,
@@ -222,6 +262,17 @@ 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 = v9fs_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,
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index a7fb54808a23..156c26bb8bd7 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -86,6 +86,10 @@ do { \
 
 /**
  * enum p9_msg_t - 9P message types
+ * @P9_TSTATFS: file system status request
+ * @P9_RSTATFS: file system status response
+ * @P9_TRENAME: rename request
+ * @P9_RRENAME: rename response
  * @P9_TVERSION: version handshake request
  * @P9_RVERSION: version handshake response
  * @P9_TAUTH: request to establish authentication channel
@@ -125,6 +129,10 @@ do { \
  */
 
 enum p9_msg_t {
+        P9_TSTATFS = 8,
+        P9_RSTATFS,
+        P9_TRENAME = 20,
+        P9_RRENAME,
         P9_TVERSION = 100,
         P9_RVERSION,
         P9_TAUTH = 102,
@@ -350,6 +358,31 @@ struct p9_wstat {
 };
 
 /* Structures for Protocol Operations */
+struct p9_tstatfs {
+        u32 fid;
+};
+
+struct p9_rstatfs {
+        u32 type;
+        u32 bsize;
+        u64 blocks;
+        u64 bfree;
+        u64 bavail;
+        u64 files;
+        u64 ffree;
+        u64 fsid;
+        u32 namelen;
+};
+
+struct p9_trename {
+        u32 fid;
+        u32 newdirfid;
+        struct p9_str name;
+};
+
+struct p9_rrename {
+};
+
 struct p9_tversion {
         u32 msize;
         struct p9_str version;
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 4f3760afc20f..7dd3ed85c782 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -195,6 +195,8 @@ struct p9_fid {
         struct list_head dlist; /* list of all fids attached to a dentry */
 };
 
+int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb);
+int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name);
 int p9_client_version(struct p9_client *);
 struct p9_client *p9_client_create(const char *dev_name, char *options);
 void p9_client_destroy(struct p9_client *clnt);
diff --git a/net/9p/client.c b/net/9p/client.c
index 0aa79faa9850..37c8da07a80b 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1321,7 +1321,8 @@ static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
         if (wst->muid)
                 ret += strlen(wst->muid);
 
-        if (proto_version == p9_proto_2000u) {
+        if ((proto_version == p9_proto_2000u) ||
+                (proto_version == p9_proto_2000L)) {
                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
                 if (wst->extension)
                         ret += strlen(wst->extension);
@@ -1364,3 +1365,70 @@ error:
         return err;
 }
 EXPORT_SYMBOL(p9_client_wstat);
+
+int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
+{
+        int err;
+        struct p9_req_t *req;
+        struct p9_client *clnt;
+
+        err = 0;
+        clnt = fid->clnt;
+
+        P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
+
+        req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
+        if (IS_ERR(req)) {
+                err = PTR_ERR(req);
+                goto error;
+        }
+
+        err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
+                &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
+                &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
+        if (err) {
+                p9pdu_dump(1, req->rc);
+                p9_free_req(clnt, req);
+                goto error;
+        }
+
+        P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
+                "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
+                "fsid %llu namelen %ld\n",
+                fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
+                sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
+                sb->fsid, (long int)sb->namelen);
+
+        p9_free_req(clnt, req);
+error:
+        return err;
+}
+EXPORT_SYMBOL(p9_client_statfs);
+
+int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
+{
+        int err;
+        struct p9_req_t *req;
+        struct p9_client *clnt;
+
+        err = 0;
+        clnt = fid->clnt;
+
+        P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
+                        fid->fid, newdirfid->fid, name);
+
+        req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
+                        newdirfid->fid, name);
+        if (IS_ERR(req)) {
+                err = PTR_ERR(req);
+                goto error;
+        }
+
+        P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
+
+        p9_free_req(clnt, req);
+error:
+        return err;
+}
+EXPORT_SYMBOL(p9_client_rename);
+
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index e7541d5b0118..77d3aab4036b 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -341,7 +341,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
                         }
                         break;
                 case '?':
-                        if (proto_version != p9_proto_2000u)
+                        if ((proto_version != p9_proto_2000u) &&
+                                (proto_version != p9_proto_2000L))
                                 return 0;
                         break;
                 default:
@@ -488,7 +489,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
                         }
                         break;
                 case '?':
-                        if (proto_version != p9_proto_2000u)
+                        if ((proto_version != p9_proto_2000u) &&
+                                (proto_version != p9_proto_2000L))
                                 return 0;
                         break;
                 default: