コード例 #1
0
ファイル: server.c プロジェクト: rzr/connman
static struct dhcp_lease *add_lease(GDHCPServer *dhcp_server, uint32_t expire,
					const uint8_t *chaddr, uint32_t yiaddr)
{
	struct dhcp_lease *lease = NULL;
	int ret;

	ret = get_lease(dhcp_server, yiaddr, chaddr, &lease);
	if (ret != 0)
		return NULL;

	memset(lease, 0, sizeof(*lease));

	memcpy(lease->lease_mac, chaddr, ETH_ALEN);
	lease->lease_nip = ntohl(yiaddr);

	if (expire == 0)
		lease->expire = time(NULL) + dhcp_server->lease_seconds;
	else
		lease->expire = expire;

	dhcp_server->lease_list = g_list_insert_sorted(dhcp_server->lease_list,
							lease, compare_expire);

	g_hash_table_insert(dhcp_server->nip_lease_hash,
				GINT_TO_POINTER((int) lease->lease_nip), lease);

	return lease;
}
コード例 #2
0
ファイル: open.c プロジェクト: rroart/freevms
static inline long do_sys_truncate(const char * path, loff_t length)
{
    struct nameidata nd;
    struct inode * inode;
    int error;

    error = -EINVAL;
    if (length < 0)	/* sorry, but loff_t says... */
        goto out;

    error = user_path_walk(path, &nd);
    if (error)
        goto out;
    inode = nd.dentry->d_inode;

    /* For directories it's -EISDIR, for other non-regulars - -EINVAL */
    error = -EISDIR;
    if (S_ISDIR(inode->i_mode))
        goto dput_and_out;

    error = -EINVAL;
    if (!S_ISREG(inode->i_mode))
        goto dput_and_out;

    error = permission(inode,MAY_WRITE);
    if (error)
        goto dput_and_out;

    error = -EROFS;
    if (IS_RDONLY(inode))
        goto dput_and_out;

    error = -EPERM;
    if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
        goto dput_and_out;

    /*
     * Make sure that there are no leases.
     */
    error = get_lease(inode, FMODE_WRITE);
    if (error)
        goto dput_and_out;

    error = get_write_access(inode);
    if (error)
        goto dput_and_out;

    error = locks_verify_truncate(inode, NULL, length);
    if (!error)
    {
        DQUOT_INIT(inode);
        error = do_truncate(nd.dentry, length);
    }
    put_write_access(inode);

dput_and_out:
    path_release(&nd);
out:
    return error;
}
コード例 #3
0
ファイル: vfs.c プロジェクト: niubl/camera_project
/*
 * Set various file attributes.
 * N.B. After this call fhp needs an fh_put
 */
int
nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
	     int check_guard, time_t guardtime)
{
	struct dentry	*dentry;
	struct inode	*inode;
	int		accmode = MAY_SATTR;
	int		ftype = 0;
	int		imode;
	int		err;
	int		size_change = 0;

	if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
		accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
	if (iap->ia_valid & ATTR_SIZE)
		ftype = S_IFREG;

	/* Get inode */
	err = fh_verify(rqstp, fhp, ftype, accmode);
	if (err || !iap->ia_valid)
		goto out;

	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;

	/* NFSv2 does not differentiate between "set-[ac]time-to-now"
	 * which only requires access, and "set-[ac]time-to-X" which
	 * requires ownership.
	 * So if it looks like it might be "set both to the same time which
	 * is close to now", and if inode_change_ok fails, then we
	 * convert to "set to now" instead of "set to explicit time"
	 *
	 * We only call inode_change_ok as the last test as technically
	 * it is not an interface that we should be using.  It is only
	 * valid if the filesystem does not define it's own i_op->setattr.
	 */
#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
#define	MAX_TOUCH_TIME_ERROR (30*60)
	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
	    && iap->ia_mtime == iap->ia_atime
	    ) {
	    /* Looks probable.  Now just make sure time is in the right ballpark.
	     * Solaris, at least, doesn't seem to care what the time request is.
	     * We require it be within 30 minutes of now.
	     */
	    time_t delta = iap->ia_atime - CURRENT_TIME;
	    if (delta<0) delta = -delta;
	    if (delta < MAX_TOUCH_TIME_ERROR &&
		inode_change_ok(inode, iap) != 0) {
		/* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
		 * this will cause notify_change to set these times to "now"
		 */
		iap->ia_valid &= ~BOTH_TIME_SET;
	    }
	}
	    
	/* The size case is special. It changes the file as well as the attributes.  */
	if (iap->ia_valid & ATTR_SIZE) {
		if (iap->ia_size < inode->i_size) {
			err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
			if (err)
				goto out;
		}

		/*
		 * If we are changing the size of the file, then
		 * we need to break all leases.
		 */
		err = get_lease(inode, FMODE_WRITE);
		if (err)
			goto out_nfserr;

		err = get_write_access(inode);
		if (err)
			goto out_nfserr;

		err = locks_verify_truncate(inode, NULL, iap->ia_size);
		if (err) {
			put_write_access(inode);
			goto out_nfserr;
		}
		DQUOT_INIT(inode);
	}

	imode = inode->i_mode;
	if (iap->ia_valid & ATTR_MODE) {
		iap->ia_mode &= S_IALLUGO;
		imode = iap->ia_mode |= (imode & ~S_IALLUGO);
	}

	/* Revoke setuid/setgid bit on chown/chgrp */
	if ((iap->ia_valid & ATTR_UID) && (imode & S_ISUID)
	 && iap->ia_uid != inode->i_uid) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = imode &= ~S_ISUID;
	}
	if ((iap->ia_valid & ATTR_GID) && (imode & S_ISGID)
	 && iap->ia_gid != inode->i_gid) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = imode &= ~S_ISGID;
	}

	/* Change the attributes. */


	iap->ia_valid |= ATTR_CTIME;

	if (iap->ia_valid & ATTR_SIZE) {
		fh_lock(fhp);
		size_change = 1;
	}
	err = nfserr_notsync;
	if (!check_guard || guardtime == inode->i_ctime) {
		err = notify_change(dentry, iap);
		err = nfserrno(err);
	}
	if (size_change) {
		fh_unlock(fhp);
		put_write_access(inode);
	}
	if (!err)
		if (EX_ISSYNC(fhp->fh_export))
			write_inode_now(inode, 1);
out:
	return err;

out_nfserr:
	err = nfserrno(err);
	goto out;
}