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jffs2: use generic posix ACL infrastructure 

Also don't bother to set up a .get_acl method for symlinks as we do not
support access control (ACLs or even mode bits) for symlinks in Linux.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2013-12-20 05:16:47 -08:00 committed by Al Viro
parent b0a7ab5706
commit f2963d4551
7 changed files with 24 additions and 143 deletions
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141
fs/jffs2/acl.c
View File

@ -178,10 +178,6 @@ struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
char *value = NULL;
int rc, xprefix;
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
xprefix = JFFS2_XPREFIX_ACL_ACCESS;
@ -232,13 +228,10 @@ static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *a
return rc;
}
static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
int rc, xprefix;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
switch (type) {
case ACL_TYPE_ACCESS:
xprefix = JFFS2_XPREFIX_ACL_ACCESS;
@ -277,30 +270,21 @@ static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode)
{
struct posix_acl *acl;
struct posix_acl *default_acl, *acl;
int rc;
cache_no_acl(inode);
if (S_ISLNK(*i_mode))
return 0; /* Symlink always has no-ACL */
acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (!acl) {
*i_mode &= ~current_umask();
} else {
if (S_ISDIR(*i_mode))
set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
rc = __posix_acl_create(&acl, GFP_KERNEL, i_mode);
if (rc < 0)
return rc;
if (rc > 0)
set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
rc = posix_acl_create(dir_i, i_mode, &default_acl, &acl);
if (rc)
return rc;
if (default_acl) {
set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl);
posix_acl_release(default_acl);
}
if (acl) {
set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
posix_acl_release(acl);
}
return 0;
@ -324,106 +308,3 @@ int jffs2_init_acl_post(struct inode *inode)
return 0;
}
int jffs2_acl_chmod(struct inode *inode)
{
struct posix_acl *acl;
int rc;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl) || !acl)
return PTR_ERR(acl);
rc = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
if (rc)
return rc;
rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl);
posix_acl_release(acl);
return rc;
}
static size_t jffs2_acl_access_listxattr(struct dentry *dentry, char *list,
size_t list_size, const char *name, size_t name_len, int type)
{
const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS);
if (list && retlen <= list_size)
strcpy(list, POSIX_ACL_XATTR_ACCESS);
return retlen;
}
static size_t jffs2_acl_default_listxattr(struct dentry *dentry, char *list,
size_t list_size, const char *name, size_t name_len, int type)
{
const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT);
if (list && retlen <= list_size)
strcpy(list, POSIX_ACL_XATTR_DEFAULT);
return retlen;
}
static int jffs2_acl_getxattr(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
{
struct posix_acl *acl;
int rc;
if (name[0] != '\0')
return -EINVAL;
acl = jffs2_get_acl(dentry->d_inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (!acl)
return -ENODATA;
rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
posix_acl_release(acl);
return rc;
}
static int jffs2_acl_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags, int type)
{
struct posix_acl *acl;
int rc;
if (name[0] != '\0')
return -EINVAL;
if (!inode_owner_or_capable(dentry->d_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) {
rc = posix_acl_valid(acl);
if (rc)
goto out;
}
} else {
acl = NULL;
}
rc = jffs2_set_acl(dentry->d_inode, type, acl);
out:
posix_acl_release(acl);
return rc;
}
const struct xattr_handler jffs2_acl_access_xattr_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.flags = ACL_TYPE_DEFAULT,
.list = jffs2_acl_access_listxattr,
.get = jffs2_acl_getxattr,
.set = jffs2_acl_setxattr,
};
const struct xattr_handler jffs2_acl_default_xattr_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.list = jffs2_acl_default_listxattr,
.get = jffs2_acl_getxattr,
.set = jffs2_acl_setxattr,
};

7
fs/jffs2/acl.h
View File

@ -27,17 +27,14 @@ struct jffs2_acl_header {
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
struct posix_acl *jffs2_get_acl(struct inode *inode, int type);
extern int jffs2_acl_chmod(struct inode *);
int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
extern int jffs2_init_acl_pre(struct inode *, struct inode *, umode_t *);
extern int jffs2_init_acl_post(struct inode *);
extern const struct xattr_handler jffs2_acl_access_xattr_handler;
extern const struct xattr_handler jffs2_acl_default_xattr_handler;
#else
#define jffs2_get_acl (NULL)
#define jffs2_acl_chmod(inode) (0)
#define jffs2_set_acl (NULL)
#define jffs2_init_acl_pre(dir_i,inode,mode) (0)
#define jffs2_init_acl_post(inode) (0)

1
fs/jffs2/dir.c
View File

@ -59,6 +59,7 @@ const struct inode_operations jffs2_dir_inode_operations =
.mknod = jffs2_mknod,
.rename = jffs2_rename,
.get_acl = jffs2_get_acl,
.set_acl = jffs2_set_acl,
.setattr = jffs2_setattr,
.setxattr = jffs2_setxattr,
.getxattr = jffs2_getxattr,

1
fs/jffs2/file.c
View File

@ -66,6 +66,7 @@ const struct file_operations jffs2_file_operations =
const struct inode_operations jffs2_file_inode_operations =
{
.get_acl = jffs2_get_acl,
.set_acl = jffs2_set_acl,
.setattr = jffs2_setattr,
.setxattr = jffs2_setxattr,
.getxattr = jffs2_getxattr,

7
fs/jffs2/fs.c
View File

@ -190,15 +190,16 @@ int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
{
struct inode *inode = dentry->d_inode;
int rc;
rc = inode_change_ok(dentry->d_inode, iattr);
rc = inode_change_ok(inode, iattr);
if (rc)
return rc;
rc = jffs2_do_setattr(dentry->d_inode, iattr);
rc = jffs2_do_setattr(inode, iattr);
if (!rc && (iattr->ia_valid & ATTR_MODE))
rc = jffs2_acl_chmod(dentry->d_inode);
rc = posix_acl_chmod(inode, inode->i_mode);
return rc;
}

1
fs/jffs2/symlink.c
View File

@ -22,7 +22,6 @@ const struct inode_operations jffs2_symlink_inode_operations =
{
.readlink = generic_readlink,
.follow_link = jffs2_follow_link,
.get_acl = jffs2_get_acl,
.setattr = jffs2_setattr,
.setxattr = jffs2_setxattr,
.getxattr = jffs2_getxattr,

9
fs/jffs2/xattr.c
View File

@ -22,6 +22,7 @@
#include <linux/crc32.h>
#include <linux/jffs2.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include <linux/mtd/mtd.h>
#include "nodelist.h"
/* -------- xdatum related functions ----------------
@ -921,8 +922,8 @@ const struct xattr_handler *jffs2_xattr_handlers[] = {
&jffs2_security_xattr_handler,
#endif
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
&jffs2_acl_access_xattr_handler,
&jffs2_acl_default_xattr_handler,
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
&jffs2_trusted_xattr_handler,
NULL
@ -942,10 +943,10 @@ static const struct xattr_handler *xprefix_to_handler(int xprefix) {
#endif
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
case JFFS2_XPREFIX_ACL_ACCESS:
ret = &jffs2_acl_access_xattr_handler;
ret = &posix_acl_access_xattr_handler;
break;
case JFFS2_XPREFIX_ACL_DEFAULT:
ret = &jffs2_acl_default_xattr_handler;
ret = &posix_acl_default_xattr_handler;
break;
#endif
case JFFS2_XPREFIX_TRUSTED: