diff options
Diffstat (limited to 'kernel/fs/ocfs2/acl.c')
| -rw-r--r-- | kernel/fs/ocfs2/acl.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/kernel/fs/ocfs2/acl.c b/kernel/fs/ocfs2/acl.c new file mode 100644 index 000000000..c58a1bcfd --- /dev/null +++ b/kernel/fs/ocfs2/acl.c @@ -0,0 +1,310 @@ +/* -*- 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); + + 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); + switch(acl->a_entries[n].e_tag) { + case ACL_USER: + acl->a_entries[n].e_uid = + make_kuid(&init_user_ns, + le32_to_cpu(entry->e_id)); + break; + case ACL_GROUP: + acl->a_entries[n].e_gid = + make_kgid(&init_user_ns, + le32_to_cpu(entry->e_id)); + break; + default: + break; + } + 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); + switch(acl->a_entries[n].e_tag) { + case ACL_USER: + entry->e_id = cpu_to_le32( + from_kuid(&init_user_ns, + acl->a_entries[n].e_uid)); + break; + case ACL_GROUP: + entry->e_id = cpu_to_le32( + from_kgid(&init_user_ns, + acl->a_entries[n].e_gid)); + break; + default: + entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); + break; + } + } + 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; +} + +/* + * 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_update_inode_fsync_trans(handle, inode, 0); + + 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. + */ +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; + + 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; +} + +int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type) +{ + return ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL); +} + +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; +} |