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: update documentation pointers
  9p: remove unnecessary v9fses->options which duplicates the mount string
  net/9p: insulate the client against an invalid error code sent by a 9p server
  9p: Add missing cast for the error return value in v9fs_get_inode
  9p: Remove redundant inode uid/gid assignment
  9p: Fix possible regressions when ->get_sb fails.
  9p: Fix v9fs show_options
  9p: Fix possible memleak in v9fs_inode_from fid.
  9p: minor comment fixes
  9p: Fix possible inode leak in v9fs_get_inode.
  9p: Check for error in return value of v9fs_fid_add

4 files changed, 82 insertions, 105 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 332b5ff02fec..f7003cfac63d 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -76,7 +76,7 @@ static const match_table_t tokens = {
  * Return 0 upon success, -ERRNO upon failure.
  */
 
-static int v9fs_parse_options(struct v9fs_session_info *v9ses)
+static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
 {
         char *options;
         substring_t args[MAX_OPT_ARGS];
@@ -90,10 +90,10 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses)
         v9ses->debug = 0;
         v9ses->cache = 0;
 
-        if (!v9ses->options)
+        if (!opts)
                 return 0;
 
-        options = kstrdup(v9ses->options, GFP_KERNEL);
+        options = kstrdup(opts, GFP_KERNEL);
         if (!options) {
                 P9_DPRINTK(P9_DEBUG_ERROR,
                            "failed to allocate copy of option string\n");
@@ -206,24 +206,14 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
         v9ses->uid = ~0;
         v9ses->dfltuid = V9FS_DEFUID;
         v9ses->dfltgid = V9FS_DEFGID;
-        if (data) {
-                v9ses->options = kstrdup(data, GFP_KERNEL);
-                if (!v9ses->options) {
-                        P9_DPRINTK(P9_DEBUG_ERROR,
-                           "failed to allocate copy of option string\n");
-                        retval = -ENOMEM;
-                        goto error;
-                }
-        }
 
-        rc = v9fs_parse_options(v9ses);
+        rc = v9fs_parse_options(v9ses, data);
         if (rc < 0) {
                 retval = rc;
                 goto error;
         }
 
-        v9ses->clnt = p9_client_create(dev_name, v9ses->options);
-
+        v9ses->clnt = p9_client_create(dev_name, data);
         if (IS_ERR(v9ses->clnt)) {
                 retval = PTR_ERR(v9ses->clnt);
                 v9ses->clnt = NULL;
@@ -280,7 +270,6 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
 
         __putname(v9ses->uname);
         __putname(v9ses->aname);
-        kfree(v9ses->options);
 }
 
 /**
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index a7d567192998..38762bf102a9 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -85,7 +85,6 @@ struct v9fs_session_info {
         unsigned int afid;
         unsigned int cache;
 
-        char *options;          /* copy of mount options */
         char *uname;            /* user name to mount as */
         char *aname;            /* name of remote hierarchy being mounted */
         unsigned int maxdata;   /* max data for client interface */
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 81f8bbf12f9f..06a223d50a81 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -171,7 +171,6 @@ int v9fs_uflags2omode(int uflags, int extended)
 
 /**
  * v9fs_blank_wstat - helper function to setup a 9P stat structure
- * @v9ses: 9P session info (for determining extended mode)
  * @wstat: structure to initialize
  *
  */
@@ -207,65 +206,72 @@ v9fs_blank_wstat(struct p9_wstat *wstat)
 
 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 {
+        int err;
         struct inode *inode;
         struct v9fs_session_info *v9ses = sb->s_fs_info;
 
         P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
 
         inode = new_inode(sb);
-        if (inode) {
-                inode->i_mode = mode;
-                inode->i_uid = current_fsuid();
-                inode->i_gid = current_fsgid();
-                inode->i_blocks = 0;
-                inode->i_rdev = 0;
-                inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
-                inode->i_mapping->a_ops = &v9fs_addr_operations;
-
-                switch (mode & S_IFMT) {
-                case S_IFIFO:
-                case S_IFBLK:
-                case S_IFCHR:
-                case S_IFSOCK:
-                        if (!v9fs_extended(v9ses)) {
-                                P9_DPRINTK(P9_DEBUG_ERROR,
-                                      "special files without extended mode\n");
-                                return ERR_PTR(-EINVAL);
-                        }
-                        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;
-                        break;
-                case S_IFLNK:
-                        if (!v9fs_extended(v9ses)) {
-                                P9_DPRINTK(P9_DEBUG_ERROR,
-                                        "extended modes used w/o 9P2000.u\n");
-                                return ERR_PTR(-EINVAL);
-                        }
-                        inode->i_op = &v9fs_symlink_inode_operations;
-                        break;
-                case S_IFDIR:
-                        inc_nlink(inode);
-                        if (v9fs_extended(v9ses))
-                                inode->i_op = &v9fs_dir_inode_operations_ext;
-                        else
-                                inode->i_op = &v9fs_dir_inode_operations;
-                        inode->i_fop = &v9fs_dir_operations;
-                        break;
-                default:
-                        P9_DPRINTK(P9_DEBUG_ERROR,
-                                "BAD mode 0x%x S_IFMT 0x%x\n",
-                                mode, mode & S_IFMT);
-                        return ERR_PTR(-EINVAL);
-                }
-        } else {
+        if (!inode) {
                 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
                 return ERR_PTR(-ENOMEM);
         }
+
+        inode->i_mode = mode;
+        inode->i_uid = current_fsuid();
+        inode->i_gid = current_fsgid();
+        inode->i_blocks = 0;
+        inode->i_rdev = 0;
+        inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+        inode->i_mapping->a_ops = &v9fs_addr_operations;
+
+        switch (mode & S_IFMT) {
+        case S_IFIFO:
+        case S_IFBLK:
+        case S_IFCHR:
+        case S_IFSOCK:
+                if (!v9fs_extended(v9ses)) {
+                        P9_DPRINTK(P9_DEBUG_ERROR,
+                                   "special files without extended mode\n");
+                        err = -EINVAL;
+                        goto error;
+                }
+                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;
+                break;
+        case S_IFLNK:
+                if (!v9fs_extended(v9ses)) {
+                        P9_DPRINTK(P9_DEBUG_ERROR,
+                                   "extended modes used w/o 9P2000.u\n");
+                        err = -EINVAL;
+                        goto error;
+                }
+                inode->i_op = &v9fs_symlink_inode_operations;
+                break;
+        case S_IFDIR:
+                inc_nlink(inode);
+                if (v9fs_extended(v9ses))
+                        inode->i_op = &v9fs_dir_inode_operations_ext;
+                else
+                        inode->i_op = &v9fs_dir_inode_operations;
+                inode->i_fop = &v9fs_dir_operations;
+                break;
+        default:
+                P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
+                           mode, mode & S_IFMT);
+                err = -EINVAL;
+                goto error;
+        }
+
         return inode;
+
+error:
+        iput(inode);
+        return ERR_PTR(err);
 }
 
 /*
@@ -338,30 +344,25 @@ v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 
         ret = NULL;
         st = p9_client_stat(fid);
-        if (IS_ERR(st)) {
-                err = PTR_ERR(st);
-                st = NULL;
-                goto error;
-        }
+        if (IS_ERR(st))
+                return ERR_CAST(st);
 
         umode = p9mode2unixmode(v9ses, st->mode);
         ret = v9fs_get_inode(sb, umode);
         if (IS_ERR(ret)) {
                 err = PTR_ERR(ret);
-                ret = NULL;
                 goto error;
         }
 
         v9fs_stat2inode(st, ret, sb);
         ret->i_ino = v9fs_qid2ino(&st->qid);
+        p9stat_free(st);
         kfree(st);
         return ret;
 
 error:
+        p9stat_free(st);
         kfree(st);
-        if (ret)
-                iput(ret);
-
         return ERR_PTR(err);
 }
 
@@ -403,9 +404,9 @@ v9fs_open_created(struct inode *inode, struct file *file)
  * @v9ses: session information
  * @dir: directory that dentry is being created in
  * @dentry:  dentry that is being created
+ * @extension: 9p2000.u extension string to support devices, etc.
  * @perm: create permissions
  * @mode: open mode
- * @extension: 9p2000.u extension string to support devices, etc.
  *
  */
 static struct p9_fid *
@@ -470,7 +471,10 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
                 dentry->d_op = &v9fs_dentry_operations;
 
         d_instantiate(dentry, inode);
-        v9fs_fid_add(dentry, fid);
+        err = v9fs_fid_add(dentry, fid);
+        if (err < 0)
+                goto error;
+
         return ofid;
 
 error:
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 38d695d66a0b..8961f1a8f668 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -81,7 +81,7 @@ static int v9fs_set_super(struct super_block *s, void *data)
 
 static void
 v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
-                int flags)
+                int flags, void *data)
 {
         sb->s_maxbytes = MAX_LFS_FILESIZE;
         sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
@@ -91,6 +91,8 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
 
         sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
             MS_NOATIME;
+
+        save_mount_options(sb, data);
 }
 
 /**
@@ -113,14 +115,11 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
         struct v9fs_session_info *v9ses = NULL;
         struct p9_wstat *st = NULL;
         int mode = S_IRWXUGO | S_ISVTX;
-        uid_t uid = current_fsuid();
-        gid_t gid = current_fsgid();
         struct p9_fid *fid;
         int retval = 0;
 
         P9_DPRINTK(P9_DEBUG_VFS, " \n");
 
-        st = NULL;
         v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
         if (!v9ses)
                 return -ENOMEM;
@@ -142,7 +141,7 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
                 retval = PTR_ERR(sb);
                 goto free_stat;
         }
-        v9fs_fill_super(sb, v9ses, flags);
+        v9fs_fill_super(sb, v9ses, flags, data);
 
         inode = v9fs_get_inode(sb, S_IFDIR | mode);
         if (IS_ERR(inode)) {
@@ -150,9 +149,6 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
                 goto release_sb;
         }
 
-        inode->i_uid = uid;
-        inode->i_gid = gid;
-
         root = d_alloc_root(inode);
         if (!root) {
                 iput(inode);
@@ -173,10 +169,8 @@ P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
         simple_set_mnt(mnt, sb);
         return 0;
 
-release_sb:
-        deactivate_locked_super(sb);
-
 free_stat:
+        p9stat_free(st);
         kfree(st);
 
 clunk_fid:
@@ -185,7 +179,12 @@ clunk_fid:
 close_session:
         v9fs_session_close(v9ses);
         kfree(v9ses);
+        return retval;
 
+release_sb:
+        p9stat_free(st);
+        kfree(st);
+        deactivate_locked_super(sb);
         return retval;
 }
 
@@ -207,24 +206,10 @@ static void v9fs_kill_super(struct super_block *s)
 
         v9fs_session_close(v9ses);
         kfree(v9ses);
+        s->s_fs_info = NULL;
         P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
 }
 
-/**
- * v9fs_show_options - Show mount options in /proc/mounts
- * @m: seq_file to write to
- * @mnt: mount descriptor
- *
- */
-
-static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
-{
-        struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
-
-        seq_printf(m, "%s", v9ses->options);
-        return 0;
-}
-
 static void
 v9fs_umount_begin(struct super_block *sb)
 {
@@ -237,7 +222,7 @@ v9fs_umount_begin(struct super_block *sb)
 static const struct super_operations v9fs_super_ops = {
         .statfs = simple_statfs,
         .clear_inode = v9fs_clear_inode,
-        .show_options = v9fs_show_options,
+        .show_options = generic_show_options,
         .umount_begin = v9fs_umount_begin,
 };