/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * acl.c * * Copyright (C) 2004, 2008 Oracle. All rights reserved. * * CREDITS: * Lots of code in this file is copy from linux/fs/ext3/acl.c. * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License version 2 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. */ #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/string.h> #include <cluster/masklog.h> #include "ocfs2.h" #include "alloc.h" #include "dlmglue.h" #include "file.h" #include "inode.h" #include "journal.h" #include "ocfs2_fs.h" #include "xattr.h" #include "acl.h" /* * Convert from xattr value to acl struct. */ static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) { int n, count; struct posix_acl *acl; if (!value) return NULL; if (size < sizeof(struct posix_acl_entry)) return ERR_PTR(-EINVAL); count = size / sizeof(struct posix_acl_entry); if (count < 0) return ERR_PTR(-EINVAL); if (count == 0) return NULL; acl = posix_acl_alloc(count, GFP_NOFS); if (!acl) return ERR_PTR(-ENOMEM); for (n = 0; n < count; n++) { struct ocfs2_acl_entry *entry = (struct ocfs2_acl_entry *)value; acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); acl->a_entries[n].e_id = le32_to_cpu(entry->e_id); value += sizeof(struct posix_acl_entry); } return acl; } /* * Convert acl struct to xattr value. */ static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) { struct ocfs2_acl_entry *entry = NULL; char *ocfs2_acl; size_t n; *size = acl->a_count * sizeof(struct posix_acl_entry); ocfs2_acl = kmalloc(*size, GFP_NOFS); if (!ocfs2_acl) return ERR_PTR(-ENOMEM); entry = (struct ocfs2_acl_entry *)ocfs2_acl; for (n = 0; n < acl->a_count; n++, entry++) { entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); entry->e_id = cpu_to_le32(acl->a_entries[n].e_id); } return ocfs2_acl; } static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, int type, struct buffer_head *di_bh) { int name_index; char *value = NULL; struct posix_acl *acl; int retval; switch (type) { case ACL_TYPE_ACCESS: name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; break; case ACL_TYPE_DEFAULT: name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; break; default: return ERR_PTR(-EINVAL); } retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); if (retval > 0) { value = kmalloc(retval, GFP_NOFS); if (!value) return ERR_PTR(-ENOMEM); retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", value, retval); } if (retval > 0) acl = ocfs2_acl_from_xattr(value, retval); else if (retval == -ENODATA || retval == 0) acl = NULL; else acl = ERR_PTR(retval); kfree(value); return acl; } /* * Get posix acl. */ static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type) { struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct buffer_head *di_bh = NULL; struct posix_acl *acl; int ret; if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return NULL; ret = ocfs2_inode_lock(inode, &di_bh, 0); if (ret < 0) { mlog_errno(ret); acl = ERR_PTR(ret); return acl; } acl = ocfs2_get_acl_nolock(inode, type, di_bh); ocfs2_inode_unlock(inode, 0); brelse(di_bh); return acl; } /* * Helper function to set i_mode in memory and disk. Some call paths * will not have di_bh or a journal handle to pass, in which case it * will create it's own. */ static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, handle_t *handle, umode_t new_mode) { int ret, commit_handle = 0; struct ocfs2_dinode *di; if (di_bh == NULL) { ret = ocfs2_read_inode_block(inode, &di_bh); if (ret) { mlog_errno(ret); goto out; } } else get_bh(di_bh); if (handle == NULL) { handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out_brelse; } commit_handle = 1; } di = (struct ocfs2_dinode *)di_bh->b_data; ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } inode->i_mode = new_mode; inode->i_ctime = CURRENT_TIME; di->i_mode = cpu_to_le16(inode->i_mode); di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); ocfs2_journal_dirty(handle, di_bh); out_commit: if (commit_handle) ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); out_brelse: brelse(di_bh); out: return ret; } /* * Set the access or default ACL of an inode. */ static int ocfs2_set_acl(handle_t *handle, struct inode *inode, struct buffer_head *di_bh, int type, struct posix_acl *acl, struct ocfs2_alloc_context *meta_ac, struct ocfs2_alloc_context *data_ac) { int name_index; void *value = NULL; size_t size = 0; int ret; if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; switch (type) { case ACL_TYPE_ACCESS: name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; if (acl) { umode_t mode = inode->i_mode; ret = posix_acl_equiv_mode(acl, &mode); if (ret < 0) return ret; else { if (ret == 0) acl = NULL; ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); if (ret) return ret; } } break; case ACL_TYPE_DEFAULT: name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; if (!S_ISDIR(inode->i_mode)) return acl ? -EACCES : 0; break; default: return -EINVAL; } if (acl) { value = ocfs2_acl_to_xattr(acl, &size); if (IS_ERR(value)) return (int)PTR_ERR(value); } if (handle) ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, "", value, size, 0, meta_ac, data_ac); else ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); kfree(value); return ret; } struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type) { struct ocfs2_super *osb; struct buffer_head *di_bh = NULL; struct posix_acl *acl; int ret = -EAGAIN; osb = OCFS2_SB(inode->i_sb); if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return NULL; ret = ocfs2_read_inode_block(inode, &di_bh); if (ret < 0) return ERR_PTR(ret); acl = ocfs2_get_acl_nolock(inode, type, di_bh); brelse(di_bh); return acl; } int ocfs2_acl_chmod(struct inode *inode) { struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct posix_acl *acl; int ret; if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return 0; acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl) || !acl) return PTR_ERR(acl); ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); if (ret) return ret; ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, acl, NULL, NULL); posix_acl_release(acl); return ret; } /* * Initialize the ACLs of a new inode. If parent directory has default ACL, * then clone to new inode. Called from ocfs2_mknod. */ int ocfs2_init_acl(handle_t *handle, struct inode *inode, struct inode *dir, struct buffer_head *di_bh, struct buffer_head *dir_bh, struct ocfs2_alloc_context *meta_ac, struct ocfs2_alloc_context *data_ac) { struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct posix_acl *acl = NULL; int ret = 0, ret2; umode_t mode; if (!S_ISLNK(inode->i_mode)) { if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, dir_bh); if (IS_ERR(acl)) return PTR_ERR(acl); } if (!acl) { mode = inode->i_mode & ~current_umask(); ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); if (ret) { mlog_errno(ret); goto cleanup; } } } if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { if (S_ISDIR(inode->i_mode)) { ret = ocfs2_set_acl(handle, inode, di_bh, ACL_TYPE_DEFAULT, acl, meta_ac, data_ac); if (ret) goto cleanup; } mode = inode->i_mode; ret = posix_acl_create(&acl, GFP_NOFS, &mode); if (ret < 0) return ret; ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode); if (ret2) { mlog_errno(ret2); ret = ret2; goto cleanup; } if (ret > 0) { ret = ocfs2_set_acl(handle, inode, di_bh, ACL_TYPE_ACCESS, acl, meta_ac, data_ac); } } cleanup: posix_acl_release(acl); return ret; } static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry, char *list, size_t list_len, const char *name, size_t name_len, int type) { struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS); if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return 0; if (list && size <= list_len) memcpy(list, POSIX_ACL_XATTR_ACCESS, size); return size; } static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry, char *list, size_t list_len, const char *name, size_t name_len, int type) { struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT); if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return 0; if (list && size <= list_len) memcpy(list, POSIX_ACL_XATTR_DEFAULT, size); return size; } static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name, void *buffer, size_t size, int type) { struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); struct posix_acl *acl; int ret; if (strcmp(name, "") != 0) return -EINVAL; if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return -EOPNOTSUPP; acl = ocfs2_get_acl(dentry->d_inode, type); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl == NULL) return -ENODATA; ret = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); posix_acl_release(acl); return ret; } static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name, const void *value, size_t size, int flags, int type) { struct inode *inode = dentry->d_inode; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct posix_acl *acl; int ret = 0; if (strcmp(name, "") != 0) return -EINVAL; if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) return -EOPNOTSUPP; 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) { ret = posix_acl_valid(acl); if (ret) goto cleanup; } } else acl = NULL; ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL); cleanup: posix_acl_release(acl); return ret; } const struct xattr_handler ocfs2_xattr_acl_access_handler = { .prefix = POSIX_ACL_XATTR_ACCESS, .flags = ACL_TYPE_ACCESS, .list = ocfs2_xattr_list_acl_access, .get = ocfs2_xattr_get_acl, .set = ocfs2_xattr_set_acl, }; const struct xattr_handler ocfs2_xattr_acl_default_handler = { .prefix = POSIX_ACL_XATTR_DEFAULT, .flags = ACL_TYPE_DEFAULT, .list = ocfs2_xattr_list_acl_default, .get = ocfs2_xattr_get_acl, .set = ocfs2_xattr_set_acl, };