186 lines
4.2 KiB
C
186 lines
4.2 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/xattr.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "acl.h"
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#include "eaops.h"
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#include "eattr.h"
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/**
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* gfs2_ea_name2type - get the type of the ea, and truncate type from the name
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* @namep: ea name, possibly with type appended
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*
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* Returns: GFS2_EATYPE_XXX
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*/
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unsigned int gfs2_ea_name2type(const char *name, char **truncated_name)
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{
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unsigned int type;
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if (strncmp(name, "system.", 7) == 0) {
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type = GFS2_EATYPE_SYS;
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if (truncated_name)
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*truncated_name = strchr(name, '.') + 1;
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} else if (strncmp(name, "user.", 5) == 0) {
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type = GFS2_EATYPE_USR;
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if (truncated_name)
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*truncated_name = strchr(name, '.') + 1;
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} else {
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type = GFS2_EATYPE_UNUSED;
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if (truncated_name)
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*truncated_name = NULL;
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}
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return type;
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}
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static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
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{
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struct inode *inode = ip->i_vnode;
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int error = permission(inode, MAY_READ, NULL);
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if (error)
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return error;
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return gfs2_ea_get_i(ip, er);
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}
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static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
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{
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struct inode *inode = ip->i_vnode;
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if (S_ISREG(inode->i_mode) ||
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(S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
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int error = permission(inode, MAY_WRITE, NULL);
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if (error)
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return error;
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} else
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return -EPERM;
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return gfs2_ea_set_i(ip, er);
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}
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static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
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{
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struct inode *inode = ip->i_vnode;
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if (S_ISREG(inode->i_mode) ||
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(S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
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int error = permission(inode, MAY_WRITE, NULL);
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if (error)
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return error;
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} else
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return -EPERM;
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return gfs2_ea_remove_i(ip, er);
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}
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static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
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{
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if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
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!GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
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!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (ip->i_sbd->sd_args.ar_posix_acl == 0 &&
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(GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) ||
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GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
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return -EOPNOTSUPP;
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return gfs2_ea_get_i(ip, er);
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}
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static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
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{
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int remove = 0;
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int error;
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if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
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if (!(er->er_flags & GFS2_ERF_MODE)) {
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er->er_mode = ip->i_di.di_mode;
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er->er_flags |= GFS2_ERF_MODE;
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}
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error = gfs2_acl_validate_set(ip, 1, er,
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&remove, &er->er_mode);
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if (error)
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return error;
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error = gfs2_ea_set_i(ip, er);
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if (error)
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return error;
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if (remove)
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gfs2_ea_remove_i(ip, er);
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return 0;
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} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
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error = gfs2_acl_validate_set(ip, 0, er,
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&remove, NULL);
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if (error)
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return error;
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if (!remove)
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error = gfs2_ea_set_i(ip, er);
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else {
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error = gfs2_ea_remove_i(ip, er);
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if (error == -ENODATA)
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error = 0;
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}
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return error;
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}
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return -EPERM;
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}
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static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
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{
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if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
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int error = gfs2_acl_validate_remove(ip, 1);
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if (error)
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return error;
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} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
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int error = gfs2_acl_validate_remove(ip, 0);
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if (error)
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return error;
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} else
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return -EPERM;
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return gfs2_ea_remove_i(ip, er);
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}
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struct gfs2_eattr_operations gfs2_user_eaops = {
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.eo_get = user_eo_get,
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.eo_set = user_eo_set,
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.eo_remove = user_eo_remove,
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.eo_name = "user",
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};
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struct gfs2_eattr_operations gfs2_system_eaops = {
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.eo_get = system_eo_get,
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.eo_set = system_eo_set,
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.eo_remove = system_eo_remove,
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.eo_name = "system",
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};
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struct gfs2_eattr_operations *gfs2_ea_ops[] = {
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NULL,
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&gfs2_user_eaops,
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&gfs2_system_eaops,
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};
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