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- /*
- * linux/fs/hfsplus/posix_acl.c
- *
- * Vyacheslav Dubeyko <slava@dubeyko.com>
- *
- * Handler for Posix Access Control Lists (ACLs) support.
- */
- #include "hfsplus_fs.h"
- #include "xattr.h"
- #include "acl.h"
- struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
- {
- struct posix_acl *acl;
- char *xattr_name;
- char *value = NULL;
- ssize_t size;
- acl = get_cached_acl(inode, type);
- if (acl != ACL_NOT_CACHED)
- return acl;
- switch (type) {
- case ACL_TYPE_ACCESS:
- xattr_name = POSIX_ACL_XATTR_ACCESS;
- break;
- case ACL_TYPE_DEFAULT:
- xattr_name = POSIX_ACL_XATTR_DEFAULT;
- break;
- default:
- return ERR_PTR(-EINVAL);
- }
- size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
- if (size > 0) {
- value = (char *)hfsplus_alloc_attr_entry();
- if (unlikely(!value))
- return ERR_PTR(-ENOMEM);
- size = __hfsplus_getxattr(inode, xattr_name, value, size);
- }
- if (size > 0)
- acl = posix_acl_from_xattr(&init_user_ns, value, size);
- else if (size == -ENODATA)
- acl = NULL;
- else
- acl = ERR_PTR(size);
- hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
- if (!IS_ERR(acl))
- set_cached_acl(inode, type, acl);
- return acl;
- }
- static int hfsplus_set_posix_acl(struct inode *inode,
- int type,
- struct posix_acl *acl)
- {
- int err;
- char *xattr_name;
- size_t size = 0;
- char *value = NULL;
- if (S_ISLNK(inode->i_mode))
- return -EOPNOTSUPP;
- switch (type) {
- case ACL_TYPE_ACCESS:
- xattr_name = POSIX_ACL_XATTR_ACCESS;
- if (acl) {
- err = posix_acl_equiv_mode(acl, &inode->i_mode);
- if (err < 0)
- return err;
- }
- err = 0;
- break;
- case ACL_TYPE_DEFAULT:
- xattr_name = POSIX_ACL_XATTR_DEFAULT;
- if (!S_ISDIR(inode->i_mode))
- return acl ? -EACCES : 0;
- break;
- default:
- return -EINVAL;
- }
- if (acl) {
- size = posix_acl_xattr_size(acl->a_count);
- if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
- return -ENOMEM;
- value = (char *)hfsplus_alloc_attr_entry();
- if (unlikely(!value))
- return -ENOMEM;
- err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
- if (unlikely(err < 0))
- goto end_set_acl;
- }
- err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
- end_set_acl:
- hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
- if (!err)
- set_cached_acl(inode, type, acl);
- return err;
- }
- int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
- {
- int err = 0;
- struct posix_acl *acl = NULL;
- hfs_dbg(ACL_MOD,
- "[%s]: ino %lu, dir->ino %lu\n",
- __func__, inode->i_ino, dir->i_ino);
- if (S_ISLNK(inode->i_mode))
- return 0;
- acl = hfsplus_get_posix_acl(dir, ACL_TYPE_DEFAULT);
- if (IS_ERR(acl))
- return PTR_ERR(acl);
- if (acl) {
- if (S_ISDIR(inode->i_mode)) {
- err = hfsplus_set_posix_acl(inode,
- ACL_TYPE_DEFAULT,
- acl);
- if (unlikely(err))
- goto init_acl_cleanup;
- }
- err = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
- if (unlikely(err < 0))
- return err;
- if (err > 0)
- err = hfsplus_set_posix_acl(inode,
- ACL_TYPE_ACCESS,
- acl);
- } else
- inode->i_mode &= ~current_umask();
- init_acl_cleanup:
- posix_acl_release(acl);
- return err;
- }
- int hfsplus_posix_acl_chmod(struct inode *inode)
- {
- int err;
- struct posix_acl *acl;
- hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
- if (S_ISLNK(inode->i_mode))
- return -EOPNOTSUPP;
- acl = hfsplus_get_posix_acl(inode, ACL_TYPE_ACCESS);
- if (IS_ERR(acl) || !acl)
- return PTR_ERR(acl);
- err = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
- if (unlikely(err))
- return err;
- err = hfsplus_set_posix_acl(inode, ACL_TYPE_ACCESS, acl);
- posix_acl_release(acl);
- return err;
- }
- static int hfsplus_xattr_get_posix_acl(struct dentry *dentry,
- const char *name,
- void *buffer,
- size_t size,
- int type)
- {
- int err = 0;
- struct posix_acl *acl;
- hfs_dbg(ACL_MOD,
- "[%s]: ino %lu, buffer %p, size %zu, type %#x\n",
- __func__, dentry->d_inode->i_ino, buffer, size, type);
- if (strcmp(name, "") != 0)
- return -EINVAL;
- acl = hfsplus_get_posix_acl(dentry->d_inode, type);
- if (IS_ERR(acl))
- return PTR_ERR(acl);
- if (acl == NULL)
- return -ENODATA;
- err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
- posix_acl_release(acl);
- return err;
- }
- static int hfsplus_xattr_set_posix_acl(struct dentry *dentry,
- const char *name,
- const void *value,
- size_t size,
- int flags,
- int type)
- {
- int err = 0;
- struct inode *inode = dentry->d_inode;
- struct posix_acl *acl = NULL;
- hfs_dbg(ACL_MOD,
- "[%s]: ino %lu, value %p, size %zu, flags %#x, type %#x\n",
- __func__, inode->i_ino, value, size, flags, type);
- if (strcmp(name, "") != 0)
- return -EINVAL;
- 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);
- else if (acl) {
- err = posix_acl_valid(acl);
- if (err)
- goto end_xattr_set_acl;
- }
- }
- err = hfsplus_set_posix_acl(inode, type, acl);
- end_xattr_set_acl:
- posix_acl_release(acl);
- return err;
- }
- static size_t hfsplus_xattr_list_posix_acl(struct dentry *dentry,
- char *list,
- size_t list_size,
- const char *name,
- size_t name_len,
- int type)
- {
- /*
- * This method is not used.
- * It is used hfsplus_listxattr() instead of generic_listxattr().
- */
- return -EOPNOTSUPP;
- }
- const struct xattr_handler hfsplus_xattr_acl_access_handler = {
- .prefix = POSIX_ACL_XATTR_ACCESS,
- .flags = ACL_TYPE_ACCESS,
- .list = hfsplus_xattr_list_posix_acl,
- .get = hfsplus_xattr_get_posix_acl,
- .set = hfsplus_xattr_set_posix_acl,
- };
- const struct xattr_handler hfsplus_xattr_acl_default_handler = {
- .prefix = POSIX_ACL_XATTR_DEFAULT,
- .flags = ACL_TYPE_DEFAULT,
- .list = hfsplus_xattr_list_posix_acl,
- .get = hfsplus_xattr_get_posix_acl,
- .set = hfsplus_xattr_set_posix_acl,
- };
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