fs: remove generic_acl

And instead convert tmpfs to use the new generic ACL code, with two stub
methods provided for in-memory filesystems.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 37 insertions, 190 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index c229f82..7385e54 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -68,10 +68,6 @@ source "fs/quota/Kconfig"
 source "fs/autofs4/Kconfig"
 source "fs/fuse/Kconfig"
 
-config GENERIC_ACL
-	bool
-	select FS_POSIX_ACL
-
 menu "Caches"
 
 source "fs/fscache/Kconfig"
@@ -119,7 +115,7 @@ config TMPFS_POSIX_ACL
 	bool "Tmpfs POSIX Access Control Lists"
 	depends on TMPFS
 	select TMPFS_XATTR
-	select GENERIC_ACL
+	select FS_POSIX_ACL
 	help
 	  POSIX Access Control Lists (ACLs) support additional access rights
 	  for users and groups beyond the standard owner/group/world scheme,
diff --git a/fs/Makefile b/fs/Makefile
index f2c1843..5bebad4 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -44,7 +44,6 @@ obj-$(CONFIG_BINFMT_FLAT)	+= binfmt_flat.o
 obj-$(CONFIG_FS_MBCACHE)	+= mbcache.o
 obj-$(CONFIG_FS_POSIX_ACL)	+= posix_acl.o
 obj-$(CONFIG_NFS_COMMON)	+= nfs_common/
-obj-$(CONFIG_GENERIC_ACL)	+= generic_acl.o
 obj-$(CONFIG_COREDUMP)		+= coredump.o
 obj-$(CONFIG_SYSCTL)		+= drop_caches.o
 
diff --git a/fs/generic_acl.c b/fs/generic_acl.c
deleted file mode 100644
index 4357f39..0000000
--- a/fs/generic_acl.c
+++ /dev/null
@@ -1,184 +0,0 @@
-/*
- * (C) 2005 Andreas Gruenbacher <agruen@suse.de>
- *
- * This file is released under the GPL.
- *
- * Generic ACL support for in-memory filesystems.
- */
-
-#include <linux/sched.h>
-#include <linux/gfp.h>
-#include <linux/fs.h>
-#include <linux/generic_acl.h>
-#include <linux/posix_acl.h>
-#include <linux/posix_acl_xattr.h>
-
-
-static size_t
-generic_acl_list(struct dentry *dentry, char *list, size_t list_size,
-		const char *name, size_t name_len, int type)
-{
-	struct posix_acl *acl;
-	const char *xname;
-	size_t size;
-
-	acl = get_cached_acl(dentry->d_inode, type);
-	if (!acl)
-		return 0;
-	posix_acl_release(acl);
-
-	switch (type) {
-	case ACL_TYPE_ACCESS:
-		xname = POSIX_ACL_XATTR_ACCESS;
-		break;
-	case ACL_TYPE_DEFAULT:
-		xname = POSIX_ACL_XATTR_DEFAULT;
-		break;
-	default:
-		return 0;
-	}
-	size = strlen(xname) + 1;
-	if (list && size <= list_size)
-		memcpy(list, xname, size);
-	return size;
-}
-
-static int
-generic_acl_get(struct dentry *dentry, const char *name, void *buffer,
-		     size_t size, int type)
-{
-	struct posix_acl *acl;
-	int error;
-
-	if (strcmp(name, "") != 0)
-		return -EINVAL;
-
-	acl = get_cached_acl(dentry->d_inode, type);
-	if (!acl)
-		return -ENODATA;
-	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
-	posix_acl_release(acl);
-
-	return error;
-}
-
-static int
-generic_acl_set(struct dentry *dentry, const char *name, const void *value,
-		     size_t size, int flags, int type)
-{
-	struct inode *inode = dentry->d_inode;
-	struct posix_acl *acl = NULL;
-	int error;
-
-	if (strcmp(name, "") != 0)
-		return -EINVAL;
-	if (S_ISLNK(inode->i_mode))
-		return -EOPNOTSUPP;
-	if (!inode_owner_or_capable(inode))
-		return -EPERM;
-	if (value) {
-		acl = posix_acl_from_xattr(&init_user_ns, value, size);
-		if (IS_ERR(acl))
-			return PTR_ERR(acl);
-	}
-	if (acl) {
-		error = posix_acl_valid(acl);
-		if (error)
-			goto failed;
-		switch (type) {
-		case ACL_TYPE_ACCESS:
-			error = posix_acl_equiv_mode(acl, &inode->i_mode);
-			if (error < 0)
-				goto failed;
-			inode->i_ctime = CURRENT_TIME;
-			if (error == 0) {
-				posix_acl_release(acl);
-				acl = NULL;
-			}
-			break;
-		case ACL_TYPE_DEFAULT:
-			if (!S_ISDIR(inode->i_mode)) {
-				error = -EINVAL;
-				goto failed;
-			}
-			break;
-		}
-	}
-	set_cached_acl(inode, type, acl);
-	error = 0;
-failed:
-	posix_acl_release(acl);
-	return error;
-}
-
-/**
- * generic_acl_init  -  Take care of acl inheritance at @inode create time
- *
- * Files created inside a directory with a default ACL inherit the
- * directory's default ACL.
- */
-int
-generic_acl_init(struct inode *inode, struct inode *dir)
-{
-	struct posix_acl *acl = NULL;
-	int error;
-
-	if (!S_ISLNK(inode->i_mode))
-		acl = get_cached_acl(dir, ACL_TYPE_DEFAULT);
-	if (acl) {
-		if (S_ISDIR(inode->i_mode))
-			set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
-		error = __posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
-		if (error < 0)
-			return error;
-		if (error > 0)
-			set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
-	} else {
-		inode->i_mode &= ~current_umask();
-	}
-	error = 0;
-
-	posix_acl_release(acl);
-	return error;
-}
-
-/**
- * generic_acl_chmod  -  change the access acl of @inode upon chmod()
- *
- * A chmod also changes the permissions of the owner, group/mask, and
- * other ACL entries.
- */
-int
-generic_acl_chmod(struct inode *inode)
-{
-	struct posix_acl *acl;
-	int error = 0;
-
-	if (S_ISLNK(inode->i_mode))
-		return -EOPNOTSUPP;
-	acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
-	if (acl) {
-		error = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
-		if (error)
-			return error;
-		set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
-		posix_acl_release(acl);
-	}
-	return error;
-}
-
-const struct xattr_handler generic_acl_access_handler = {
-	.prefix = POSIX_ACL_XATTR_ACCESS,
-	.flags	= ACL_TYPE_ACCESS,
-	.list	= generic_acl_list,
-	.get	= generic_acl_get,
-	.set	= generic_acl_set,
-};
-
-const struct xattr_handler generic_acl_default_handler = {
-	.prefix = POSIX_ACL_XATTR_DEFAULT,
-	.flags	= ACL_TYPE_DEFAULT,
-	.list	= generic_acl_list,
-	.get	= generic_acl_get,
-	.set	= generic_acl_set,
-};
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 8f245ab..f40df9b 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -786,3 +786,39 @@ const struct xattr_handler posix_acl_default_xattr_handler = {
 	.set = posix_acl_xattr_set,
 };
 EXPORT_SYMBOL_GPL(posix_acl_default_xattr_handler);
+
+int simple_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+{
+	int error;
+
+	if (type == ACL_TYPE_ACCESS) {
+		error = posix_acl_equiv_mode(acl, &inode->i_mode);
+		if (error < 0)
+			return 0;
+		if (error == 0)
+			acl = NULL;
+	}
+
+	inode->i_ctime = CURRENT_TIME;
+	set_cached_acl(inode, type, acl);
+	return 0;
+}
+
+int simple_acl_create(struct inode *dir, struct inode *inode)
+{
+	struct posix_acl *default_acl, *acl;
+	int error;
+
+	error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
+	if (error)
+		return error;
+
+	set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl);
+	set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
+
+	if (default_acl)
+		posix_acl_release(default_acl);
+	if (acl)
+		posix_acl_release(acl);
+	return 0;
+}