提交 feda821e 编写于 作者: C Christoph Hellwig 提交者: Al Viro

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: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 013cdf10
master alk-4.19.24 alk-4.19.30 alk-4.19.34 alk-4.19.36 alk-4.19.43 alk-4.19.48 alk-4.19.57 ck-4.19.67 ck-4.19.81 ck-4.19.91 github/fork/deepanshu1422/fix-typo-in-comment github/fork/haosdent/fix-typo linux-next v4.19.91 v4.19.90 v4.19.89 v4.19.88 v4.19.87 v4.19.86 v4.19.85 v4.19.84 v4.19.83 v4.19.82 v4.19.81 v4.19.80 v4.19.79 v4.19.78 v4.19.77 v4.19.76 v4.19.75 v4.19.74 v4.19.73 v4.19.72 v4.19.71 v4.19.70 v4.19.69 v4.19.68 v4.19.67 v4.19.66 v4.19.65 v4.19.64 v4.19.63 v4.19.62 v4.19.61 v4.19.60 v4.19.59 v4.19.58 v4.19.57 v4.19.56 v4.19.55 v4.19.54 v4.19.53 v4.19.52 v4.19.51 v4.19.50 v4.19.49 v4.19.48 v4.19.47 v4.19.46 v4.19.45 v4.19.44 v4.19.43 v4.19.42 v4.19.41 v4.19.40 v4.19.39 v4.19.38 v4.19.37 v4.19.36 v4.19.35 v4.19.34 v4.19.33 v4.19.32 v4.19.31 v4.19.30 v4.19.29 v4.19.28 v4.19.27 v4.19.26 v4.19.25 v4.19.24 v4.19.23 v4.19.22 v4.19.21 v4.19.20 v4.19.19 v4.19.18 v4.19.17 v4.19.16 v4.19.15 v4.19.14 v4.19.13 v4.19.12 v4.19.11 v4.19.10 v4.19.9 v4.19.8 v4.19.7 v4.19.6 v4.19.5 v4.19.4 v4.19.3 v4.19.2 v4.19.1 v4.19 v4.19-rc8 v4.19-rc7 v4.19-rc6 v4.19-rc5 v4.19-rc4 v4.19-rc3 v4.19-rc2 v4.19-rc1 ck-release-21 ck-release-20 ck-release-19.2 ck-release-19.1 ck-release-19 ck-release-18 ck-release-17.2 ck-release-17.1 ck-release-17 ck-release-16 ck-release-15.1 ck-release-15 ck-release-14 ck-release-13.2 ck-release-13 ck-release-12 ck-release-11 ck-release-10 ck-release-9 ck-release-7 alk-release-15 alk-release-14 alk-release-13.2 alk-release-13 alk-release-12 alk-release-11 alk-release-10 alk-release-9 alk-release-7
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......@@ -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,
......
......@@ -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
......
/*
* (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,
};
......@@ -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;
}
#ifndef LINUX_GENERIC_ACL_H
#define LINUX_GENERIC_ACL_H
#include <linux/xattr.h>
struct inode;
extern const struct xattr_handler generic_acl_access_handler;
extern const struct xattr_handler generic_acl_default_handler;
int generic_acl_init(struct inode *, struct inode *);
int generic_acl_chmod(struct inode *);
#endif /* LINUX_GENERIC_ACL_H */
......@@ -99,6 +99,9 @@ extern int posix_acl_chmod(struct inode *, umode_t);
extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
struct posix_acl **);
extern int simple_set_acl(struct inode *, struct posix_acl *, int);
extern int simple_acl_create(struct inode *, struct inode *);
static inline struct posix_acl **acl_by_type(struct inode *inode, int type)
{
switch (type) {
......@@ -181,6 +184,12 @@ static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
return 0;
}
#define simple_set_acl NULL
static inline int simple_acl_create(struct inode *dir, struct inode *inode)
{
return 0;
}
static inline void cache_no_acl(struct inode *inode)
{
}
......
......@@ -45,7 +45,7 @@ static struct vfsmount *shm_mnt;
#include <linux/xattr.h>
#include <linux/exportfs.h>
#include <linux/posix_acl.h>
#include <linux/generic_acl.h>
#include <linux/posix_acl_xattr.h>
#include <linux/mman.h>
#include <linux/string.h>
#include <linux/slab.h>
......@@ -620,10 +620,8 @@ static int shmem_setattr(struct dentry *dentry, struct iattr *attr)
}
setattr_copy(inode, attr);
#ifdef CONFIG_TMPFS_POSIX_ACL
if (attr->ia_valid & ATTR_MODE)
error = generic_acl_chmod(inode);
#endif
error = posix_acl_chmod(inode, inode->i_mode);
return error;
}
......@@ -1937,22 +1935,14 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE);
if (inode) {
#ifdef CONFIG_TMPFS_POSIX_ACL
error = generic_acl_init(inode, dir);
if (error) {
iput(inode);
return error;
}
#endif
error = simple_acl_create(dir, inode);
if (error)
goto out_iput;
error = security_inode_init_security(inode, dir,
&dentry->d_name,
shmem_initxattrs, NULL);
if (error) {
if (error != -EOPNOTSUPP) {
iput(inode);
return error;
}
}
if (error && error != -EOPNOTSUPP)
goto out_iput;
error = 0;
dir->i_size += BOGO_DIRENT_SIZE;
......@@ -1961,6 +1951,9 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
dget(dentry); /* Extra count - pin the dentry in core */
}
return error;
out_iput:
iput(inode);
return error;
}
static int
......@@ -1974,24 +1967,17 @@ shmem_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
error = security_inode_init_security(inode, dir,
NULL,
shmem_initxattrs, NULL);
if (error) {
if (error != -EOPNOTSUPP) {
iput(inode);
return error;
}
}
#ifdef CONFIG_TMPFS_POSIX_ACL
error = generic_acl_init(inode, dir);
if (error) {
iput(inode);
return error;
}
#else
error = 0;
#endif
if (error && error != -EOPNOTSUPP)
goto out_iput;
error = simple_acl_create(dir, inode);
if (error)
goto out_iput;
d_tmpfile(dentry, inode);
}
return error;
out_iput:
iput(inode);
return error;
}
static int shmem_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
......@@ -2223,8 +2209,8 @@ static int shmem_initxattrs(struct inode *inode,
static const struct xattr_handler *shmem_xattr_handlers[] = {
#ifdef CONFIG_TMPFS_POSIX_ACL
&generic_acl_access_handler,
&generic_acl_default_handler,
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
NULL
};
......@@ -2740,6 +2726,7 @@ static const struct inode_operations shmem_inode_operations = {
.getxattr = shmem_getxattr,
.listxattr = shmem_listxattr,
.removexattr = shmem_removexattr,
.set_acl = simple_set_acl,
#endif
};
......@@ -2764,6 +2751,7 @@ static const struct inode_operations shmem_dir_inode_operations = {
#endif
#ifdef CONFIG_TMPFS_POSIX_ACL
.setattr = shmem_setattr,
.set_acl = simple_set_acl,
#endif
};
......@@ -2776,6 +2764,7 @@ static const struct inode_operations shmem_special_inode_operations = {
#endif
#ifdef CONFIG_TMPFS_POSIX_ACL
.setattr = shmem_setattr,
.set_acl = simple_set_acl,
#endif
};
......
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