btrfs: Add unprivileged version of ino_lookup ioctl

Add unprivileged version of ino_lookup ioctl BTRFS_IOC_INO_LOOKUP_USER
to allow normal users to call "btrfs subvolume list/show" etc. in
combination with BTRFS_IOC_GET_SUBVOL_INFO/BTRFS_IOC_GET_SUBVOL_ROOTREF.

This can be used like BTRFS_IOC_INO_LOOKUP but the argument is
different. This is  because it always searches the fs/file tree
correspoinding to the fd with which this ioctl is called and also
returns the name of bottom subvolume.

The main differences from original ino_lookup ioctl are:

  1. Read + Exec permission will be checked using inode_permission()
     during path construction. -EACCES will be returned in case
     of failure.
  2. Path construction will be stopped at the inode number which
     corresponds to the fd with which this ioctl is called. If
     constructed path does not exist under fd's inode, -EACCES
     will be returned.
  3. The name of bottom subvolume is also searched and filled.

Note that the maximum length of path is shorter 256 (BTRFS_VOL_NAME_MAX+1)
bytes than ino_lookup ioctl because of space of subvolume's name.

Reviewed-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Tested-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
[ style fixes ]
Signed-off-by: David Sterba <dsterba@suse.com>

0 files changed, 0 insertions, 0 deletions

path: root/scripts/gdb/linux/modules.py

/************************************************************************
 * s2io.c: A Linux PCI-X Ethernet driver for Neterion 10GbE Server NIC
 * Copyright(c) 2002-2005 Neterion Inc.

 * This software may be used and distributed according to the terms of
 * the GNU General Public License (GPL), incorporated herein by reference.
 * Drivers based on or derived from this code fall under the GPL and must
 * retain the authorship, copyright and license notice.  This file is not
 * a complete program and may only be used when the entire operating
 * system is licensed under the GPL.
 * See the file COPYING in this distribution for more information.
 *
 * Credits:
 * Jeff Garzik		: For pointing out the improper error condition
 *			  check in the s2io_xmit routine and also some
 *			  issues in the Tx watch dog function. Also for
 *			  patiently answering all those innumerable
 *			  questions regaring the 2.6 porting issues.
 * Stephen Hemminger	: Providing proper 2.6 porting mechanism for some
 *			  macros available only in 2.6 Kernel.
 * Francois Romieu	: For pointing out all code part that were
 *			  deprecated and also styling related comments.
 * Grant Grundler	: For helping me get rid of some Architecture
 *			  dependent code.
 * Christopher Hellwig	: Some more 2.6 specific issues in the driver.
 *
 * The module loadable parameters that are supported by the driver and a brief
 * explaination of all the variables.
 * rx_ring_num : This can be used to program the number of receive rings used
 * in the driver.
 * rx_ring_sz: This defines the number of descriptors each ring can have. This
 * is also an array of size 8.
 * rx_ring_mode: This defines the operation mode of all 8 rings. The valid
 *		values are 1, 2 and 3.
 * tx_fifo_num: This defines the number of Tx FIFOs thats used int the driver.
 * tx_fifo_len: This too is an array of 8. Each element defines the number of
 * Tx descriptors that can be associated with each corresponding FIFO.
 ************************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/ioctl.h>
#include <linux/timex.h>
#include <linux/sched.h>
#include <linux/ethtool.h>
#include <linux/version.h>
#include <linux/workqueue.h>
#include <linux/if_vlan.h>

#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>

/* local include */
#include "s2io.h"
#include "s2io-regs.h"

#define DRV_VERSION "Version 2.0.9.3"

/* S2io Driver name & version. */
static char s2io_driver_name[] = "Neterion";
static char s2io_driver_version[] = DRV_VERSION;

int rxd_size[4] = {32,48,48,64};
int rxd_count[4] = {127,85,85,63};

static inline int RXD_IS_UP2DT(RxD_t *rxdp)
{
	int ret;

	ret = ((!(rxdp->Control_1 & RXD_OWN_XENA)) &&
		(GET_RXD_MARKER(rxdp->Control_2) != THE_RXD_MARK));

	return ret;
}

/*
 * Cards with following subsystem_id have a link state indication
 * problem, 600B, 600C, 600D, 640B, 640C and 640D.
 * macro below identifies these cards given the subsystem_id.
 */
#define CARDS_WITH_FAULTY_LINK_INDICATORS(dev_type, subid) \
	(dev_type == XFRAME_I_DEVICE) ?			\
		((((subid >= 0x600B) && (subid <= 0x600D)) || \
		 ((subid >= 0x640B) && (subid <= 0x640D))) ? 1 : 0) : 0

#define LINK_IS_UP(val64) (!(val64 & (ADAPTER_STATUS_RMAC_REMOTE_FAULT | \
				      ADAPTER_STATUS_RMAC_LOCAL_FAULT)))
#define TASKLET_IN_USE test_and_set_bit(0, (&sp->tasklet_status))
#define PANIC	1
#define LOW	2
static inline int rx_buffer_level(nic_t * sp, int rxb_size, int ring)
{
	int level = 0;
	mac_info_t *mac_control;

	mac_control = &sp->mac_control;
	if ((mac_control->rings[ring].pkt_cnt - rxb_size) > 16) {
		level = LOW;
		if (rxb_size <= rxd_count[sp->rxd_mode]) {
			level = PANIC;
		}
	}

	return level;
}

/* Ethtool related variables and Macros. */
static char s2io_gstrings[][ETH_GSTRING_LEN] = {
	"Register test\t(offline)",
	"Eeprom test\t(offline)",
	"Link test\t(online)",
	"RLDRAM test\t(offline)",
	"BIST Test\t(offline)"
};

static char ethtool_stats_keys[][ETH_GSTRING_LEN] = {
	{"tmac_frms"},
	{"tmac_data_octets"},
	{"tmac_drop_frms"},
	{"tmac_mcst_frms"},
	{"tmac_bcst_frms"},
	{"tmac_pause_ctrl_frms"},
	{"tmac_any_err_frms"},
	{"tmac_vld_ip_octets"},
	{"tmac_vld_ip"},
	{"tmac_drop_ip"},
	{"tmac_icmp"},
	{"tmac_rst_tcp"},
	{"tmac_tcp"},
	{"tmac_udp"},
	{"rmac_vld_frms"},
	{"rmac_data_octets"},
	{"rmac_fcs_err_frms"},
	{"rmac_drop_frms"},
	{"rmac_vld_mcst_frms"},
	{"rmac_vld_bcst_frms"},
	{"rmac_in_rng_len_err_frms"},
	{"rmac_long_frms"},
	{"rmac_pause_ctrl_frms"},
	{"rmac_discarded_frms"},
	{"rmac_usized_frms"},
	{"rmac_osized_frms"},
	{"rmac_frag_frms"},
	{"rmac_jabber_frms"},
	{"rmac_ip"},
	{"rmac_ip_octets"},
	{"rmac_hdr_err_ip"},
	{"rmac_drop_ip"},
	{"rmac_icmp"},
	{"rmac_tcp"},
	{"rmac_udp"},
	{"rmac_err_drp_udp"},
	{"rmac_pause_cnt"},
	{"rmac_accepted_ip"},
	{"rmac_err_tcp"},
	{"\n DRIVER STATISTICS"},
	{"single_bit_ecc_errs"},
	{"double_bit_ecc_errs"},
};

#define S2IO_STAT_LEN sizeof(ethtool_stats_keys)/ ETH_GSTRING_LEN
#define S2IO_STAT_STRINGS_LEN S2IO_STAT_LEN * ETH_GSTRING_LEN

#define S2IO_TEST_LEN	sizeof(s2io_gstrings) / ETH_GSTRING_LEN
#define S2IO_STRINGS_LEN	S2IO_TEST_LEN * ETH_GSTRING_LEN

#define S2IO_TIMER_CONF(timer, handle, arg, exp)		\
			init_timer(&timer);			\
			timer.function = handle;		\
			timer.data = (unsigned long) arg;	\
			mod_timer(&timer, (jiffies + exp))	\

/* Add the vlan */
static void s2io_vlan_rx_register(struct net_device *dev,
					struct vlan_group *grp)
{
	nic_t *nic = dev->priv;
	unsigned long flags;

	spin_lock_irqsave(&nic->tx_lock, flags);
	nic->vlgrp = grp;
	spin_unlock_irqrestore(&nic->tx_lock, flags);
}

/* Unregister the vlan */
static void s2io_vlan_rx_kill_vid(struct net_device *dev, unsigned long vid)
{
	nic_t *nic = dev->priv;
	unsigned long flags;

	spin_lock_irqsave(&nic->tx_lock, flags);
	if (nic->vlgrp)
		nic->vlgrp->vlan_devices[vid] = NULL;
	spin_unlock_irqrestore(&nic->tx_lock, flags);
}

/*
 * Constants to be programmed into the Xena's registers, to configure
 * the XAUI.
 */

#define SWITCH_SIGN	0xA5A5A5A5A5A5A5A5ULL
#define	END_SIGN	0x0

static u64 herc_act_dtx_cfg[] = {
	/* Set address */
	0x8000051536750000ULL, 0x80000515367500E0ULL,
	/* Write data */
	0x8000051536750004ULL, 0x80000515367500E4ULL,
	/* Set address */
	0x80010515003F0000ULL, 0x80010515003F00E0ULL,
	/* Write data */
	0x80010515003F0004ULL, 0x80010515003F00E4ULL,
	/* Set address */
	0x801205150D440000ULL, 0x801205150D4400E0ULL,
	/* Write data */
	0x801205150D440004ULL, 0x801205150D4400E4ULL,
	/* Set address */
	0x80020515F2100000ULL, 0x80020515F21000E0ULL,
	/* Write data */
	0x80020515F2100004ULL, 0x80020515F21000E4ULL,
	/* Done */
	END_SIGN
};

static u64 xena_mdio_cfg[] = {
	/* Reset PMA PLL */
	0xC001010000000000ULL, 0xC0010100000000E0ULL,
	0xC0010100008000E4ULL,
	/* Remove Reset from PMA PLL */
	0xC001010000000000ULL, 0xC0010100000000E0ULL,
	0xC0010100000000E4ULL,
	END_SIGN
};

static u64 xena_dtx_cfg[] = {
	0x8000051500000000ULL, 0x80000515000000E0ULL,
	0x80000515D93500E4ULL, 0x8001051500000000ULL,
	0x80010515000000E0ULL, 0x80010515001E00E4ULL,
	0x8002051500000000ULL, 0x80020515000000E0ULL,
	0x80020515F21000E4ULL,
	/* Set PADLOOPBACKN */
	0x8002051500000000ULL, 0x80020515000000E0ULL,
	0x80020515B20000E4ULL, 0x8003051500000000ULL,
	0x80030515000000E0ULL, 0x80030515B20000E4ULL,
	0x8004051500000000ULL, 0x80040515000000E0ULL,
	0x80040515B20000E4ULL, 0x8005051500000000ULL,
	0x80050515000000E0ULL, 0x80050515B20000E4ULL,
	SWITCH_SIGN,
	/* Remove PADLOOPBACKN */
	0x8002051500000000ULL, 0x80020515000000E0ULL,
	0x80020515F20000E4ULL, 0x8003051500000000ULL,
	0x80030515000000E0ULL, 0x80030515F20000E4ULL,
	0x8004051500000000ULL, 0x80040515000000E0ULL,
	0x80040515F20000E4ULL, 0x8005051500000000ULL,
	0x80050515000000E0ULL, 0x80050515F20000E4ULL,
	END_SIGN
};

/*
 * Constants for Fixing the MacAddress problem seen mostly on
 * Alpha machines.
 */
static u64 fix_mac[] = {
	0x0060000000000000ULL, 0x0060600000000000ULL,
	0x0040600000000000ULL, 0x0000600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0060600000000000ULL,
	0x0020600000000000ULL, 0x0000600000000000ULL,
	0x0040600000000000ULL, 0x0060600000000000ULL,
	END_SIGN
};

/* Module Loadable parameters. */
static unsigned int tx_fifo_num = 1;
static unsigned int tx_fifo_len[MAX_TX_FIFOS] =
    {[0 ...(MAX_TX_FIFOS - 1)] = 0 };
static unsigned int rx_ring_num = 1;
static unsigned int rx_ring_sz[MAX_RX_RINGS] =
    {[0 ...(MAX_RX_RINGS - 1)] = 0 };
static unsigned int rts_frm_len[MAX_RX_RINGS] =
    {[0 ...(MAX_RX_RINGS - 1)] = 0 };
static unsigned int rx_ring_mode = 1;
static unsigned int use_continuous_tx_intrs = 1;
static unsigned int rmac_pause_time = 65535;
static unsigned int mc_pause_threshold_q0q3 = 187;
static unsigned int mc_pause_threshold_q4q7 = 187;
static unsigned int shared_splits;
static unsigned int tmac_util_period = 5;
static unsigned int rmac_util_period = 5;
static unsigned int bimodal = 0;
static unsigned int l3l4hdr_size = 128;
#ifndef CONFIG_S2IO_NAPI
static unsigned int indicate_max_pkts;
#endif
/* Frequency of Rx desc syncs expressed as power of 2 */
static unsigned int rxsync_frequency = 3;
/* Interrupt type. Values can be 0(INTA), 1(MSI), 2(MSI_X) */
static unsigned int intr_type = 0;

/*
 * S2IO device table.
 * This table lists all the devices that this driver supports.
 */
static struct pci_device_id s2io_tbl[] __devinitdata = {
	{PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_S2IO_WIN,
	 PCI_ANY_ID, PCI_ANY_ID},
	{PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_S2IO_UNI,
	 PCI_ANY_ID, PCI_ANY_ID},
	{PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_HERC_WIN,
         PCI_ANY_ID, PCI_ANY_ID},
        {PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_HERC_UNI,
         PCI_ANY_ID, PCI_ANY_ID},
	{0,}
};

MODULE_DEVICE_TABLE(pci, s2io_tbl);

static struct pci_driver s2io_driver = {
      .name = "S2IO",
      .id_table = s2io_tbl,
      .probe = s2io_init_nic,
      .remove = __devexit_p(s2io_rem_nic),
};

/* A simplifier macro used both by init and free shared_mem Fns(). */
#define TXD_MEM_PAGE_CNT(len, per_each) ((len+per_each - 1) / per_each)

/**
 * init_shared_mem - Allocation and Initialization of Memory
 * @nic: Device private variable.
 * Description: The function allocates all the memory areas shared
 * between the NIC and the driver. This includes Tx descriptors,
 * Rx descriptors and the statistics block.
 */

static int init_shared_mem(struct s2io_nic *nic)
{
	u32 size;
	void *tmp_v_addr, *tmp_v_addr_next;
	dma_addr_t tmp_p_addr, tmp_p_addr_next;
	RxD_block_t *pre_rxd_blk = NULL;
	int i, j, blk_cnt, rx_sz, tx_sz;
	int lst_size, lst_per_page;
	struct net_device *dev = nic->dev;
	unsigned long tmp;
	buffAdd_t *ba;

	mac_info_t *mac_control;
	struct config_param *config;

	mac_control = &nic->mac_control;
	config = &nic->config;


	/* Allocation and initialization of TXDLs in FIOFs */
	size = 0;
	for (i = 0; i < config->tx_fifo_num; i++) {
		size += config->tx_cfg[i].fifo_len;
	}
	if (size > MAX_AVAILABLE_TXDS) {
		DBG_PRINT(ERR_DBG, "%s: Requested TxDs too high, ",
			  __FUNCTION__);
		DBG_PRINT(ERR_DBG, "Requested: %d, max supported: 8192\n", size);
		return FAILURE;
	}

	lst_size = (sizeof(TxD_t) * config->max_txds);
	tx_sz = lst_size * size;
	lst_per_page = PAGE_SIZE / lst_size;

	for (i = 0; i < config->tx_fifo_num; i++) {
		int fifo_len = config->tx_cfg[i].fifo_len;
		int list_holder_size = fifo_len * sizeof(list_info_hold_t);
		mac_control->fifos[i].list_info = kmalloc(list_holder_size,
							  GFP_KERNEL);
		if (!mac_control->fifos[i].list_info) {
			DBG_PRINT(ERR_DBG,
				  "Malloc failed for list_info\n");
			return -ENOMEM;
		}
		memset(mac_control->fifos[i].list_info, 0, list_holder_size);
	}
	for (i = 0; i < config->tx_fifo_num; i++) {
		int page_num = TXD_MEM_PAGE_CNT(config->tx_cfg[i].fifo_len,
						lst_per_page);
		mac_control->fifos[i].tx_curr_put_info.offset = 0;
		mac_control->fifos[i].tx_curr_put_info.fifo_len =
		    config->tx_cfg[i].fifo_len - 1;
		mac_control->fifos[i].tx_curr_get_info.offset = 0;
		mac_control->fifos[i].tx_curr_get_info.fifo_len =
		    config->tx_cfg[i].fifo_len - 1;
		mac_control->fifos[i].fifo_no = i;
		mac_control->fifos[i].nic = nic;
		mac_control->fifos[i].max_txds = MAX_SKB_FRAGS + 1;

		for (j = 0; j < page_num; j++) {
			int k = 0;