/* * linux/fs/ceph/acl.c * * Copyright (C) 2013 Guangliang Zhao, * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include #include #include #include #include #include #include #include #include "super.h" static inline void ceph_set_cached_acl(struct inode *inode, int type, struct posix_acl *acl) { struct ceph_inode_info *ci = ceph_inode(inode); spin_lock(&ci->i_ceph_lock); if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) set_cached_acl(inode, type, acl); spin_unlock(&ci->i_ceph_lock); } struct posix_acl *ceph_get_acl(struct inode *inode, int type) { int size; const char *name; char *value = NULL; struct posix_acl *acl; switch (type) { case ACL_TYPE_ACCESS: name = POSIX_ACL_XATTR_ACCESS; break; case ACL_TYPE_DEFAULT: name = POSIX_ACL_XATTR_DEFAULT; break; default: BUG(); } size = __ceph_getxattr(inode, name, "", 0); if (size > 0) { value = kzalloc(size, GFP_NOFS); if (!value) return ERR_PTR(-ENOMEM); size = __ceph_getxattr(inode, name, value, size); } if (size > 0) acl = posix_acl_from_xattr(&init_user_ns, value, size); else if (size == -ERANGE || size == -ENODATA || size == 0) acl = NULL; else acl = ERR_PTR(-EIO); kfree(value); if (!IS_ERR(acl)) ceph_set_cached_acl(inode, type, acl); return acl; } int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type) { int ret = 0, size = 0; const char *name = NULL; char *value = NULL; struct iattr newattrs; umode_t new_mode = inode->i_mode, old_mode = inode->i_mode; struct dentry *dentry; switch (type) { case ACL_TYPE_ACCESS: name = POSIX_ACL_XATTR_ACCESS; if (acl) { ret = posix_acl_update_mode(inode, &new_mode, &acl); if (ret) goto out; } break; case ACL_TYPE_DEFAULT: if (!S_ISDIR(inode->i_mode)) { ret = acl ? -EINVAL : 0; goto out; } name = POSIX_ACL_XATTR_DEFAULT; break; default: ret = -EINVAL; goto out; } if (acl) { size = posix_acl_xattr_size(acl->a_count); value = kmalloc(size, GFP_NOFS); if (!value) { ret = -ENOMEM; goto out; } ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); if (ret < 0) goto out_free; } dentry = d_find_alias(inode); if (new_mode != old_mode) { newattrs.ia_mode = new_mode; newattrs.ia_valid = ATTR_MODE; ret = ceph_setattr(dentry, &newattrs); if (ret) goto out_dput; } ret = __ceph_setxattr(dentry, name, value, size, 0); if (ret) { if (new_mode != old_mode) { newattrs.ia_mode = old_mode; newattrs.ia_valid = ATTR_MODE; ceph_setattr(dentry, &newattrs); } goto out_dput; } ceph_set_cached_acl(inode, type, acl); out_dput: dput(dentry); out_free: kfree(value); out: return ret; } int ceph_pre_init_acls(struct inode *dir, umode_t *mode, struct ceph_acls_info *info) { struct posix_acl *acl, *default_acl; size_t val_size1 = 0, val_size2 = 0; struct ceph_pagelist *pagelist = NULL; void *tmp_buf = NULL; int err; err = posix_acl_create(dir, mode, &default_acl, &acl); if (err) return err; if (acl) { int ret = posix_acl_equiv_mode(acl, mode); if (ret < 0) goto out_err; if (ret == 0) { posix_acl_release(acl); acl = NULL; } } if (!default_acl && !acl) return 0; if (acl) val_size1 = posix_acl_xattr_size(acl->a_count); if (default_acl) val_size2 = posix_acl_xattr_size(default_acl->a_count); err = -ENOMEM; tmp_buf = kmalloc(max(val_size1, val_size2), GFP_NOFS); if (!tmp_buf) goto out_err; pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_NOFS); if (!pagelist) goto out_err; ceph_pagelist_init(pagelist); err = ceph_pagelist_reserve(pagelist, PAGE_SIZE); if (err) goto out_err; ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1); if (acl) { size_t len = strlen(POSIX_ACL_XATTR_ACCESS); err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8); if (err) goto out_err; ceph_pagelist_encode_string(pagelist, POSIX_ACL_XATTR_ACCESS, len); err = posix_acl_to_xattr(&init_user_ns, acl, tmp_buf, val_size1); if (err < 0) goto out_err; ceph_pagelist_encode_32(pagelist, val_size1); ceph_pagelist_append(pagelist, tmp_buf, val_size1); } if (default_acl) { size_t len = strlen(POSIX_ACL_XATTR_DEFAULT); err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8); if (err) goto out_err; err = ceph_pagelist_encode_string(pagelist, POSIX_ACL_XATTR_DEFAULT, len); err = posix_acl_to_xattr(&init_user_ns, default_acl, tmp_buf, val_size2); if (err < 0) goto out_err; ceph_pagelist_encode_32(pagelist, val_size2); ceph_pagelist_append(pagelist, tmp_buf, val_size2); } kfree(tmp_buf); info->acl = acl; info->default_acl = default_acl; info->pagelist = pagelist; return 0; out_err: posix_acl_release(acl); posix_acl_release(default_acl); kfree(tmp_buf); if (pagelist) ceph_pagelist_release(pagelist); return err; } void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info) { if (!inode) return; ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl); ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl); } void ceph_release_acls_info(struct ceph_acls_info *info) { posix_acl_release(info->acl); posix_acl_release(info->default_acl); if (info->pagelist) ceph_pagelist_release(info->pagelist); }