acl.c revision 758582361976e9640a1cb9516c0af10cdf8e4753
17221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao/* 27221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * linux/fs/ceph/acl.c 37221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * 47221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com> 57221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * 67221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * This program is free software; you can redistribute it and/or 77221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * modify it under the terms of the GNU General Public 87221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * License v2 as published by the Free Software Foundation. 97221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * 107221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * This program is distributed in the hope that it will be useful, 117221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * but WITHOUT ANY WARRANTY; without even the implied warranty of 127221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 137221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * General Public License for more details. 147221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * 157221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * You should have received a copy of the GNU General Public 167221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * License along with this program; if not, write to the 177221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 187221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao * Boston, MA 021110-1307, USA. 197221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao */ 207221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 217221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/ceph/ceph_debug.h> 227221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/fs.h> 237221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/string.h> 247221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/xattr.h> 257221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/posix_acl_xattr.h> 267221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/posix_acl.h> 277221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/sched.h> 287221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include <linux/slab.h> 297221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 307221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao#include "super.h" 317221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 327221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhaostatic inline void ceph_set_cached_acl(struct inode *inode, 337221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao int type, struct posix_acl *acl) 347221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao{ 357221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao struct ceph_inode_info *ci = ceph_inode(inode); 367221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 377221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao spin_lock(&ci->i_ceph_lock); 387221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) 397221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao set_cached_acl(inode, type, acl); 407221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao spin_unlock(&ci->i_ceph_lock); 417221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao} 427221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 437221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhaostatic inline struct posix_acl *ceph_get_cached_acl(struct inode *inode, 447221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao int type) 457221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao{ 467221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao struct ceph_inode_info *ci = ceph_inode(inode); 477221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao struct posix_acl *acl = ACL_NOT_CACHED; 487221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 497221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao spin_lock(&ci->i_ceph_lock); 507221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) 517221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao acl = get_cached_acl(inode, type); 527221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao spin_unlock(&ci->i_ceph_lock); 537221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 547221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao return acl; 557221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao} 567221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 577221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhaovoid ceph_forget_all_cached_acls(struct inode *inode) 587221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao{ 597221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao forget_all_cached_acls(inode); 607221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao} 617221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 627221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhaostruct posix_acl *ceph_get_acl(struct inode *inode, int type) 637221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao{ 647221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao int size; 657221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao const char *name; 667221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao char *value = NULL; 677221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao struct posix_acl *acl; 687221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 697221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao switch (type) { 707221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao case ACL_TYPE_ACCESS: 717221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao name = POSIX_ACL_XATTR_ACCESS; 727221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao break; 737221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao case ACL_TYPE_DEFAULT: 747221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao name = POSIX_ACL_XATTR_DEFAULT; 757221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao break; 767221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao default: 777221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao BUG(); 787221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 797221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 807221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao size = __ceph_getxattr(inode, name, "", 0); 817221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (size > 0) { 827221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao value = kzalloc(size, GFP_NOFS); 837221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (!value) 847221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao return ERR_PTR(-ENOMEM); 857221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao size = __ceph_getxattr(inode, name, value, size); 867221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 877221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 887221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (size > 0) 897221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao acl = posix_acl_from_xattr(&init_user_ns, value, size); 907221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao else if (size == -ERANGE || size == -ENODATA || size == 0) 917221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao acl = NULL; 927221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao else 937221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao acl = ERR_PTR(-EIO); 947221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 957221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao kfree(value); 967221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 977221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (!IS_ERR(acl)) 987221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ceph_set_cached_acl(inode, type, acl); 997221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1007221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao return acl; 1017221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao} 1027221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 10372466d0b92e04a7e0e5abf74c86eb352225346e4Sage Weilint ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type) 1047221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao{ 1057221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao int ret = 0, size = 0; 1067221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao const char *name = NULL; 1077221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao char *value = NULL; 1087221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao struct iattr newattrs; 1097221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao umode_t new_mode = inode->i_mode, old_mode = inode->i_mode; 11072466d0b92e04a7e0e5abf74c86eb352225346e4Sage Weil struct dentry *dentry = d_find_alias(inode); 1117221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1127221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (acl) { 1137221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = posix_acl_valid(acl); 1147221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (ret < 0) 1157221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out; 1167221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1177221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1187221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao switch (type) { 1197221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao case ACL_TYPE_ACCESS: 1207221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao name = POSIX_ACL_XATTR_ACCESS; 1217221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (acl) { 1227221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = posix_acl_equiv_mode(acl, &new_mode); 1237221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (ret < 0) 1247221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out; 1257221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (ret == 0) 1267221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao acl = NULL; 1277221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1287221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao break; 1297221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao case ACL_TYPE_DEFAULT: 1307221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (!S_ISDIR(inode->i_mode)) { 1317221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = acl ? -EINVAL : 0; 1327221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out; 1337221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1347221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao name = POSIX_ACL_XATTR_DEFAULT; 1357221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao break; 1367221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao default: 1377221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = -EINVAL; 1387221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out; 1397221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1407221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1417221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (acl) { 1427221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao size = posix_acl_xattr_size(acl->a_count); 1437221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao value = kmalloc(size, GFP_NOFS); 1447221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (!value) { 1457221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = -ENOMEM; 1467221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out; 1477221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1487221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1497221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); 1507221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (ret < 0) 1517221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out_free; 1527221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1537221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1547221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (new_mode != old_mode) { 1557221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao newattrs.ia_mode = new_mode; 1567221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao newattrs.ia_valid = ATTR_MODE; 1577221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = ceph_setattr(dentry, &newattrs); 1587221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (ret) 1597221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out_free; 1607221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1617221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1627221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (value) 1637221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = __ceph_setxattr(dentry, name, value, size, 0); 1647221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao else 1657221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ret = __ceph_removexattr(dentry, name); 1667221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1677221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (ret) { 1687221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao if (new_mode != old_mode) { 1697221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao newattrs.ia_mode = old_mode; 1707221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao newattrs.ia_valid = ATTR_MODE; 1717221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ceph_setattr(dentry, &newattrs); 1727221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1737221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao goto out_free; 1747221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao } 1757221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1767221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao ceph_set_cached_acl(inode, type, acl); 1777221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1787221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhaoout_free: 1797221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao kfree(value); 1807221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhaoout: 1817221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao return ret; 1827221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao} 1837221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 1847221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhaoint ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir) 1857221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao{ 186758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig struct posix_acl *default_acl, *acl; 187758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig int error; 1887221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 189758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 190758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig if (error) 191758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig return error; 1927221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 193758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig if (!default_acl && !acl) 1947221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao cache_no_acl(inode); 1957221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao 196758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig if (default_acl) { 197758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig error = ceph_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 198758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig posix_acl_release(default_acl); 199758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig } 200758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig if (acl) { 201758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig if (!error) 202758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig error = ceph_set_acl(inode, acl, ACL_TYPE_ACCESS); 203758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig posix_acl_release(acl); 204758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig } 205758582361976e9640a1cb9516c0af10cdf8e4753Christoph Hellwig return error; 2067221fe4c2ed72804b28633c8e0217d65abb0023fGuangliang Zhao} 207