mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
234 lines
5.2 KiB
C
234 lines
5.2 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2002-2004
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* Copyright (C) Andreas Gruenbacher, 2001
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* Copyright (C) Linus Torvalds, 1991, 1992
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/quotaops.h>
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#include "jfs_incore.h"
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#include "jfs_xattr.h"
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#include "jfs_acl.h"
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static struct posix_acl *jfs_get_acl(struct inode *inode, int type)
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{
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struct posix_acl *acl;
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char *ea_name;
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struct jfs_inode_info *ji = JFS_IP(inode);
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struct posix_acl **p_acl;
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int size;
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char *value = NULL;
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switch(type) {
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case ACL_TYPE_ACCESS:
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ea_name = XATTR_NAME_ACL_ACCESS;
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p_acl = &ji->i_acl;
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break;
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case ACL_TYPE_DEFAULT:
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ea_name = XATTR_NAME_ACL_DEFAULT;
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p_acl = &ji->i_default_acl;
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break;
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default:
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return ERR_PTR(-EINVAL);
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}
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if (*p_acl != JFS_ACL_NOT_CACHED)
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return posix_acl_dup(*p_acl);
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size = __jfs_getxattr(inode, ea_name, NULL, 0);
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if (size > 0) {
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value = kmalloc(size, GFP_KERNEL);
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if (!value)
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return ERR_PTR(-ENOMEM);
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size = __jfs_getxattr(inode, ea_name, value, size);
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}
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if (size < 0) {
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if (size == -ENODATA) {
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*p_acl = NULL;
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acl = NULL;
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} else
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acl = ERR_PTR(size);
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} else {
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acl = posix_acl_from_xattr(value, size);
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if (!IS_ERR(acl))
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*p_acl = posix_acl_dup(acl);
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}
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if (value)
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kfree(value);
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return acl;
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}
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static int jfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
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{
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char *ea_name;
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struct jfs_inode_info *ji = JFS_IP(inode);
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struct posix_acl **p_acl;
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int rc;
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int size = 0;
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char *value = NULL;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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switch(type) {
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case ACL_TYPE_ACCESS:
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ea_name = XATTR_NAME_ACL_ACCESS;
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p_acl = &ji->i_acl;
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break;
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case ACL_TYPE_DEFAULT:
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ea_name = XATTR_NAME_ACL_DEFAULT;
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p_acl = &ji->i_default_acl;
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if (!S_ISDIR(inode->i_mode))
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return acl ? -EACCES : 0;
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break;
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default:
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return -EINVAL;
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}
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if (acl) {
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size = xattr_acl_size(acl->a_count);
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value = kmalloc(size, GFP_KERNEL);
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if (!value)
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return -ENOMEM;
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rc = posix_acl_to_xattr(acl, value, size);
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if (rc < 0)
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goto out;
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}
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rc = __jfs_setxattr(inode, ea_name, value, size, 0);
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out:
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if (value)
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kfree(value);
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if (!rc) {
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if (*p_acl && (*p_acl != JFS_ACL_NOT_CACHED))
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posix_acl_release(*p_acl);
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*p_acl = posix_acl_dup(acl);
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}
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return rc;
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}
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static int jfs_check_acl(struct inode *inode, int mask)
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{
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struct jfs_inode_info *ji = JFS_IP(inode);
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if (ji->i_acl == JFS_ACL_NOT_CACHED) {
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struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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posix_acl_release(acl);
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}
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if (ji->i_acl)
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return posix_acl_permission(inode, ji->i_acl, mask);
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return -EAGAIN;
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}
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int jfs_permission(struct inode *inode, int mask, struct nameidata *nd)
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{
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return generic_permission(inode, mask, jfs_check_acl);
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}
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int jfs_init_acl(struct inode *inode, struct inode *dir)
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{
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struct posix_acl *acl = NULL;
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struct posix_acl *clone;
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mode_t mode;
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int rc = 0;
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if (S_ISLNK(inode->i_mode))
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return 0;
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acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (acl) {
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if (S_ISDIR(inode->i_mode)) {
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rc = jfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
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if (rc)
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goto cleanup;
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}
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clone = posix_acl_clone(acl, GFP_KERNEL);
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if (!clone) {
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rc = -ENOMEM;
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goto cleanup;
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}
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mode = inode->i_mode;
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rc = posix_acl_create_masq(clone, &mode);
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if (rc >= 0) {
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inode->i_mode = mode;
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if (rc > 0)
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rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
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}
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posix_acl_release(clone);
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cleanup:
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posix_acl_release(acl);
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} else
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inode->i_mode &= ~current->fs->umask;
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return rc;
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}
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static int jfs_acl_chmod(struct inode *inode)
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{
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struct posix_acl *acl, *clone;
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int rc;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
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if (IS_ERR(acl) || !acl)
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return PTR_ERR(acl);
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clone = posix_acl_clone(acl, GFP_KERNEL);
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posix_acl_release(acl);
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if (!clone)
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return -ENOMEM;
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rc = posix_acl_chmod_masq(clone, inode->i_mode);
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if (!rc)
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rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
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posix_acl_release(clone);
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return rc;
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}
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int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
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{
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struct inode *inode = dentry->d_inode;
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int rc;
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rc = inode_change_ok(inode, iattr);
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if (rc)
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return rc;
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if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
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(iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
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if (DQUOT_TRANSFER(inode, iattr))
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return -EDQUOT;
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}
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rc = inode_setattr(inode, iattr);
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if (!rc && (iattr->ia_valid & ATTR_MODE))
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rc = jfs_acl_chmod(inode);
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return rc;
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}
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