/* * 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; hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); switch (type) { case ACL_TYPE_ACCESS: xattr_name = XATTR_NAME_POSIX_ACL_ACCESS; break; case ACL_TYPE_DEFAULT: xattr_name = XATTR_NAME_POSIX_ACL_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); return acl; } int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type) { int err; char *xattr_name; size_t size = 0; char *value = NULL; hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino); switch (type) { case ACL_TYPE_ACCESS: xattr_name = XATTR_NAME_POSIX_ACL_ACCESS; if (acl) { err = posix_acl_update_mode(inode, &inode->i_mode, &acl); if (err) return err; } err = 0; break; case ACL_TYPE_DEFAULT: xattr_name = XATTR_NAME_POSIX_ACL_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 *default_acl, *acl; 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; err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); if (err) return err; if (default_acl) { err = hfsplus_set_posix_acl(inode, default_acl, ACL_TYPE_DEFAULT); posix_acl_release(default_acl); } if (acl) { if (!err) err = hfsplus_set_posix_acl(inode, acl, ACL_TYPE_ACCESS); posix_acl_release(acl); } return err; }