From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 16 Jun 2015 05:50:43 +0000 (-0400)
Subject: ufs: don't bother with lock_ufs()/unlock_ufs() for directory access
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=a50e4a02ad6957ef6f77cccaa8ef6a337f1856af;p=openwrt%2Fstaging%2Fblogic.git

ufs: don't bother with lock_ufs()/unlock_ufs() for directory access

We are already serialized by ->i_mutex and operations on different
directories are independent.  These calls are just rudiments of
blind BKL conversion and they should've been removed back then.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 60ee32249b72..3429079c11e2 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -56,11 +56,9 @@ static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsi
 	if (dentry->d_name.len > UFS_MAXNAMLEN)
 		return ERR_PTR(-ENAMETOOLONG);
 
-	lock_ufs(dir->i_sb);
 	ino = ufs_inode_by_name(dir, &dentry->d_name);
 	if (ino)
 		inode = ufs_iget(dir->i_sb, ino);
-	unlock_ufs(dir->i_sb);
 	return d_splice_alias(inode, dentry);
 }
 
@@ -76,24 +74,16 @@ static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
 		bool excl)
 {
 	struct inode *inode;
-	int err;
-
-	UFSD("BEGIN\n");
 
 	inode = ufs_new_inode(dir, mode);
-	err = PTR_ERR(inode);
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
 
-	if (!IS_ERR(inode)) {
-		inode->i_op = &ufs_file_inode_operations;
-		inode->i_fop = &ufs_file_operations;
-		inode->i_mapping->a_ops = &ufs_aops;
-		mark_inode_dirty(inode);
-		lock_ufs(dir->i_sb);
-		err = ufs_add_nondir(dentry, inode);
-		unlock_ufs(dir->i_sb);
-	}
-	UFSD("END: err=%d\n", err);
-	return err;
+	inode->i_op = &ufs_file_inode_operations;
+	inode->i_fop = &ufs_file_operations;
+	inode->i_mapping->a_ops = &ufs_aops;
+	mark_inode_dirty(inode);
+	return ufs_add_nondir(dentry, inode);
 }
 
 static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
@@ -110,9 +100,7 @@ static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev
 		init_special_inode(inode, mode, rdev);
 		ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
 		mark_inode_dirty(inode);
-		lock_ufs(dir->i_sb);
 		err = ufs_add_nondir(dentry, inode);
-		unlock_ufs(dir->i_sb);
 	}
 	return err;
 }
@@ -121,18 +109,17 @@ static int ufs_symlink (struct inode * dir, struct dentry * dentry,
 	const char * symname)
 {
 	struct super_block * sb = dir->i_sb;
-	int err = -ENAMETOOLONG;
+	int err;
 	unsigned l = strlen(symname)+1;
 	struct inode * inode;
 
 	if (l > sb->s_blocksize)
-		goto out_notlocked;
+		return -ENAMETOOLONG;
 
-	lock_ufs(dir->i_sb);
 	inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
-		goto out;
+		return err;
 
 	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
 		/* slow symlink */
@@ -149,17 +136,13 @@ static int ufs_symlink (struct inode * dir, struct dentry * dentry,
 	}
 	mark_inode_dirty(inode);
 
-	err = ufs_add_nondir(dentry, inode);
-out:
-	unlock_ufs(dir->i_sb);
-out_notlocked:
-	return err;
+	return ufs_add_nondir(dentry, inode);
 
 out_fail:
 	inode_dec_link_count(inode);
 	unlock_new_inode(inode);
 	iput(inode);
-	goto out;
+	return err;
 }
 
 static int ufs_link (struct dentry * old_dentry, struct inode * dir,
@@ -168,8 +151,6 @@ static int ufs_link (struct dentry * old_dentry, struct inode * dir,
 	struct inode *inode = d_inode(old_dentry);
 	int error;
 
-	lock_ufs(dir->i_sb);
-
 	inode->i_ctime = CURRENT_TIME_SEC;
 	inode_inc_link_count(inode);
 	ihold(inode);
@@ -180,7 +161,6 @@ static int ufs_link (struct dentry * old_dentry, struct inode * dir,
 		iput(inode);
 	} else
 		d_instantiate(dentry, inode);
-	unlock_ufs(dir->i_sb);
 	return error;
 }
 
@@ -189,7 +169,6 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 	struct inode * inode;
 	int err;
 
-	lock_ufs(dir->i_sb);
 	inode_inc_link_count(dir);
 
 	inode = ufs_new_inode(dir, S_IFDIR|mode);
@@ -210,12 +189,10 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 	err = ufs_add_link(dentry, inode);
 	if (err)
 		goto out_fail;
-	unlock_ufs(dir->i_sb);
 
 	unlock_new_inode(inode);
 	d_instantiate(dentry, inode);
-out:
-	return err;
+	return 0;
 
 out_fail:
 	inode_dec_link_count(inode);
@@ -224,8 +201,7 @@ out_fail:
 	iput (inode);
 out_dir:
 	inode_dec_link_count(dir);
-	unlock_ufs(dir->i_sb);
-	goto out;
+	return err;
 }
 
 static int ufs_unlink(struct inode *dir, struct dentry *dentry)
@@ -255,7 +231,6 @@ static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
 	struct inode * inode = d_inode(dentry);
 	int err= -ENOTEMPTY;
 
-	lock_ufs(dir->i_sb);
 	if (ufs_empty_dir (inode)) {
 		err = ufs_unlink(dir, dentry);
 		if (!err) {
@@ -264,7 +239,6 @@ static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
 			inode_dec_link_count(dir);
 		}
 	}
-	unlock_ufs(dir->i_sb);
 	return err;
 }