misc cleanups (the part that hadn't been picked by individual fs trees)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull misc filesystem updates from Al Viro:
 "Misc cleanups (the part that hadn't been picked by individual fs
  trees)"

* tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  apparmorfs: don't duplicate kfree_link()
  orangefs: saner arguments passing in readdir guts
  ocfs2_find_match(): there's no such thing as NULL or negative ->d_parent
  reiserfs_add_entry(): get rid of pointless namelen checks
  __ocfs2_add_entry(), ocfs2_prepare_dir_for_insert(): namelen checks
  ext4_add_entry(): ->d_name.len is never 0
  befs: d_obtain_alias(ERR_PTR(...)) will do the right thing
  affs: d_obtain_alias(ERR_PTR(...)) will do the right thing
  /proc/sys: use d_splice_alias() calling conventions to simplify failure exits
  hostfs: use d_splice_alias() calling conventions to simplify failure exits
  udf_fiiter_add_entry(): check for zero ->d_name.len is bogus...
  udf: d_obtain_alias(ERR_PTR(...)) will do the right thing...
  udf: d_splice_alias() will do the right thing on ERR_PTR() inode
  nfsd: kill stale comment about simple_fill_super() requirements
  bfs_add_entry(): get rid of pointless ->d_name.len checks
  nilfs2: d_obtain_alias(ERR_PTR(...)) will do the right thing...
  zonefs: d_splice_alias() will do the right thing on ERR_PTR() inode

fs/affs/namei.c

@@ -532,9 +532,6 @@ static struct dentry *affs_get_parent(struct dentry *child)
 	parent = affs_iget(child->d_sb,
 			   be32_to_cpu(AFFS_TAIL(child->d_sb, bh)->parent));
 	brelse(bh);
-	if (IS_ERR(parent))
-		return ERR_CAST(parent);
-
 	return d_obtain_alias(parent);
 }
 

fs/befs/linuxvfs.c

@@ -671,9 +671,6 @@ static struct dentry *befs_get_parent(struct dentry *child)
 
 	parent = befs_iget(child->d_sb,
 			   (unsigned long)befs_ino->i_parent.start);
-	if (IS_ERR(parent))
-		return ERR_CAST(parent);
-
 	return d_obtain_alias(parent);
 }
 

fs/bfs/dir.c

@@ -275,11 +275,6 @@ static int bfs_add_entry(struct inode *dir, const struct qstr *child, int ino)
 
 	dprintf("name=%s, namelen=%d\n", name, namelen);
 
-	if (!namelen)
-		return -ENOENT;
-	if (namelen > BFS_NAMELEN)
-		return -ENAMETOOLONG;
-
 	sblock = BFS_I(dir)->i_sblock;
 	eblock = BFS_I(dir)->i_eblock;
 	for (block = sblock; block <= eblock; block++) {

fs/ext4/namei.c

@@ -2388,8 +2388,6 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
 
 	sb = dir->i_sb;
 	blocksize = sb->s_blocksize;
-	if (!dentry->d_name.len)
-		return -EINVAL;
 
 	if (fscrypt_is_nokey_name(dentry))
 		return -ENOKEY;

fs/hostfs/hostfs_kern.c

@@ -637,12 +637,8 @@ static struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
 
 	inode = hostfs_iget(ino->i_sb, name);
 	__putname(name);
-	if (IS_ERR(inode)) {
-		if (PTR_ERR(inode) == -ENOENT)
-			inode = NULL;
-		else
-			return ERR_CAST(inode);
-	}
+	if (inode == ERR_PTR(-ENOENT))
+		inode = NULL;
 
 	return d_splice_alias(inode, dentry);
 }

fs/nfsd/nfsctl.c

@@ -48,10 +48,6 @@ enum {
 	NFSD_MaxBlkSize,
 	NFSD_MaxConnections,
 	NFSD_Filecache,
-	/*
-	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
-	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
-	 */
 #ifdef CONFIG_NFSD_V4
 	NFSD_Leasetime,
 	NFSD_Gracetime,

fs/nilfs2/namei.c

@@ -441,7 +441,6 @@ static int nilfs_rename(struct mnt_idmap *idmap,
 static struct dentry *nilfs_get_parent(struct dentry *child)
 {
 	unsigned long ino;
-	struct inode *inode;
 	struct nilfs_root *root;
 
 	ino = nilfs_inode_by_name(d_inode(child), &dotdot_name);
@@ -450,11 +449,7 @@ static struct dentry *nilfs_get_parent(struct dentry *child)
 
 	root = NILFS_I(d_inode(child))->i_root;
 
-	inode = nilfs_iget(child->d_sb, root, ino);
-	if (IS_ERR(inode))
-		return ERR_CAST(inode);
-
-	return d_obtain_alias(inode);
+	return d_obtain_alias(nilfs_iget(child->d_sb, root, ino));
 }
 
 static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,

fs/ocfs2/dcache.c

@@ -124,17 +124,10 @@ static int ocfs2_match_dentry(struct dentry *dentry,
 	if (!dentry->d_fsdata)
 		return 0;
 
-	if (!dentry->d_parent)
-		return 0;
-
 	if (skip_unhashed && d_unhashed(dentry))
 		return 0;
 
 	parent = d_inode(dentry->d_parent);
-	/* Negative parent dentry? */
-	if (!parent)
-		return 0;
-
 	/* Name is in a different directory. */
 	if (OCFS2_I(parent)->ip_blkno != parent_blkno)
 		return 0;

fs/ocfs2/dir.c

@@ -1593,9 +1593,6 @@ int __ocfs2_add_entry(handle_t *handle,
 	struct buffer_head *insert_bh = lookup->dl_leaf_bh;
 	char *data_start = insert_bh->b_data;
 
-	if (!namelen)
-		return -EINVAL;
-
 	if (ocfs2_dir_indexed(dir)) {
 		struct buffer_head *bh;
 
@@ -4245,12 +4242,6 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 	trace_ocfs2_prepare_dir_for_insert(
 		(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen);
 
-	if (!namelen) {
-		ret = -EINVAL;
-		mlog_errno(ret);
-		goto out;
-	}
-
 	/*
 	 * Do this up front to reduce confusion.
 	 *

fs/orangefs/dir.c

@@ -58,10 +58,10 @@ struct orangefs_dir {
  * first part of the part list.
  */
 
-static int do_readdir(struct orangefs_inode_s *oi,
-    struct orangefs_dir *od, struct dentry *dentry,
+static int do_readdir(struct orangefs_dir *od, struct inode *inode,
     struct orangefs_kernel_op_s *op)
 {
+	struct orangefs_inode_s *oi = ORANGEFS_I(inode);
 	struct orangefs_readdir_response_s *resp;
 	int bufi, r;
 
@@ -87,7 +87,7 @@ static int do_readdir(struct orangefs_inode_s *oi,
 	op->upcall.req.readdir.buf_index = bufi;
 
 	r = service_operation(op, "orangefs_readdir",
-	    get_interruptible_flag(dentry->d_inode));
+	    get_interruptible_flag(inode));
 
 	orangefs_readdir_index_put(bufi);
 
@@ -158,8 +158,7 @@ static int parse_readdir(struct orangefs_dir *od,
 	return 0;
 }
 
-static int orangefs_dir_more(struct orangefs_inode_s *oi,
-    struct orangefs_dir *od, struct dentry *dentry)
+static int orangefs_dir_more(struct orangefs_dir *od, struct inode *inode)
 {
 	struct orangefs_kernel_op_s *op;
 	int r;
@@ -169,7 +168,7 @@ static int orangefs_dir_more(struct orangefs_inode_s *oi,
 		od->error = -ENOMEM;
 		return -ENOMEM;
 	}
-	r = do_readdir(oi, od, dentry, op);
+	r = do_readdir(od, inode, op);
 	if (r) {
 		od->error = r;
 		goto out;
@@ -238,9 +237,7 @@ static int fill_from_part(struct orangefs_dir_part *part,
 	return 1;
 }
 
-static int orangefs_dir_fill(struct orangefs_inode_s *oi,
-    struct orangefs_dir *od, struct dentry *dentry,
-    struct dir_context *ctx)
+static int orangefs_dir_fill(struct orangefs_dir *od, struct dir_context *ctx)
 {
 	struct orangefs_dir_part *part;
 	size_t count;
@@ -304,15 +301,10 @@ static loff_t orangefs_dir_llseek(struct file *file, loff_t offset,
 static int orangefs_dir_iterate(struct file *file,
     struct dir_context *ctx)
 {
-	struct orangefs_inode_s *oi;
-	struct orangefs_dir *od;
-	struct dentry *dentry;
+	struct orangefs_dir *od = file->private_data;
+	struct inode *inode = file_inode(file);
 	int r;
 
-	dentry = file->f_path.dentry;
-	oi = ORANGEFS_I(dentry->d_inode);
-	od = file->private_data;
-
 	if (od->error)
 		return od->error;
 
@@ -342,7 +334,7 @@ static int orangefs_dir_iterate(struct file *file,
 	 */
 	while (od->token != ORANGEFS_ITERATE_END &&
 	    ctx->pos > od->end) {
-		r = orangefs_dir_more(oi, od, dentry);
+		r = orangefs_dir_more(od, inode);
 		if (r)
 			return r;
 	}
@@ -351,17 +343,17 @@ static int orangefs_dir_iterate(struct file *file,
 
 	/* Then try to fill if there's any left in the buffer. */
 	if (ctx->pos < od->end) {
-		r = orangefs_dir_fill(oi, od, dentry, ctx);
+		r = orangefs_dir_fill(od, ctx);
 		if (r)
 			return r;
 	}
 
 	/* Finally get some more and try to fill. */
 	if (od->token != ORANGEFS_ITERATE_END) {
-		r = orangefs_dir_more(oi, od, dentry);
+		r = orangefs_dir_more(od, inode);
 		if (r)
 			return r;
-		r = orangefs_dir_fill(oi, od, dentry, ctx);
+		r = orangefs_dir_fill(od, ctx);
 	}
 
 	return r;

fs/proc/proc_sysctl.c

@@ -534,13 +534,8 @@ static struct dentry *proc_sys_lookup(struct inode *dir, struct dentry *dentry,
 			goto out;
 	}
 
-	inode = proc_sys_make_inode(dir->i_sb, h ? h : head, p);
-	if (IS_ERR(inode)) {
-		err = ERR_CAST(inode);
-		goto out;
-	}
-
 	d_set_d_op(dentry, &proc_sys_dentry_operations);
+	inode = proc_sys_make_inode(dir->i_sb, h ? h : head, p);
 	err = d_splice_alias(inode, dentry);
 
 out:
@@ -698,13 +693,8 @@ static bool proc_sys_fill_cache(struct file *file,
 			return false;
 		if (d_in_lookup(child)) {
 			struct dentry *res;
-			inode = proc_sys_make_inode(dir->d_sb, head, table);
-			if (IS_ERR(inode)) {
-				d_lookup_done(child);
-				dput(child);
-				return false;
-			}
 			d_set_d_op(child, &proc_sys_dentry_operations);
+			inode = proc_sys_make_inode(dir->d_sb, head, table);
 			res = d_splice_alias(inode, child);
 			d_lookup_done(child);
 			if (unlikely(res)) {

fs/reiserfs/namei.c

@@ -451,13 +451,6 @@ static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
 
 	BUG_ON(!th->t_trans_id);
 
-	/* cannot allow items to be added into a busy deleted directory */
-	if (!namelen)
-		return -EINVAL;
-
-	if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
-		return -ENAMETOOLONG;
-
 	/* each entry has unique key. compose it */
 	make_cpu_key(&entry_key, dir,
 		     get_third_component(dir->i_sb, name, namelen),

fs/udf/namei.c

@@ -125,8 +125,6 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 		udf_fiiter_release(&iter);
 
 		inode = udf_iget(dir->i_sb, &loc);
-		if (IS_ERR(inode))
-			return ERR_CAST(inode);
 	}
 
 	return d_splice_alias(inode, dentry);
@@ -230,8 +228,6 @@ static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
 	char name[UDF_NAME_LEN_CS0];
 
 	if (dentry) {
-		if (!dentry->d_name.len)
-			return -EINVAL;
 		namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
 					   dentry->d_name.len,
 					   name, UDF_NAME_LEN_CS0);
@@ -904,7 +900,6 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 static struct dentry *udf_get_parent(struct dentry *child)
 {
 	struct kernel_lb_addr tloc;
-	struct inode *inode = NULL;
 	struct udf_fileident_iter iter;
 	int err;
 
@@ -914,11 +909,7 @@ static struct dentry *udf_get_parent(struct dentry *child)
 
 	tloc = lelb_to_cpu(iter.fi.icb.extLocation);
 	udf_fiiter_release(&iter);
-	inode = udf_iget(child->d_sb, &tloc);
-	if (IS_ERR(inode))
-		return ERR_CAST(inode);
-
-	return d_obtain_alias(inode);
+	return d_obtain_alias(udf_iget(child->d_sb, &tloc));
 }
 
 

fs/zonefs/super.c

@@ -747,8 +747,6 @@ static struct dentry *zonefs_lookup(struct inode *dir, struct dentry *dentry,
 		inode = zonefs_get_dir_inode(dir, dentry);
 	else
 		inode = zonefs_get_file_inode(dir, dentry);
-	if (IS_ERR(inode))
-		return ERR_CAST(inode);
 
 	return d_splice_alias(inode, dentry);
 }

security/apparmor/apparmorfs.c

@@ -1615,11 +1615,6 @@ static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
 	return buffer;
 }
 
-static void rawdata_link_cb(void *arg)
-{
-	kfree(arg);
-}
-
 static const char *rawdata_get_link_base(struct dentry *dentry,
 					 struct inode *inode,
 					 struct delayed_call *done,
@@ -1643,7 +1638,7 @@ static const char *rawdata_get_link_base(struct dentry *dentry,
 	if (IS_ERR(target))
 		return target;
 
-	set_delayed_call(done, rawdata_link_cb, target);
+	set_delayed_call(done, kfree_link, target);
 
 	return target;
 }