Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * RDMA Network Block Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #undef pr_fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/in6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <rdma/ib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <rdma/rdma_cm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include "rnbd-clt.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static struct device *rnbd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static struct class *rnbd_dev_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static struct kobject *rnbd_devs_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	RNBD_OPT_ERR		= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	RNBD_OPT_DEST_PORT	= 1 << 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	RNBD_OPT_PATH		= 1 << 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	RNBD_OPT_DEV_PATH	= 1 << 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	RNBD_OPT_ACCESS_MODE	= 1 << 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	RNBD_OPT_SESSNAME	= 1 << 6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static const unsigned int rnbd_opt_mandatory[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	RNBD_OPT_PATH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	RNBD_OPT_DEV_PATH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	RNBD_OPT_SESSNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static const match_table_t rnbd_opt_tokens = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	{RNBD_OPT_PATH,		"path=%s"	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	{RNBD_OPT_DEV_PATH,	"device_path=%s"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	{RNBD_OPT_DEST_PORT,	"dest_port=%d"  },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	{RNBD_OPT_ACCESS_MODE,	"access_mode=%s"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	{RNBD_OPT_SESSNAME,	"sessname=%s"	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	{RNBD_OPT_ERR,		NULL		},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) struct rnbd_map_options {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	char *sessname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct rtrs_addr *paths;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	size_t *path_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	char *pathname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	u16 *dest_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	enum rnbd_access_mode *access_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static int rnbd_clt_parse_map_options(const char *buf, size_t max_path_cnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 				       struct rnbd_map_options *opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	char *options, *sep_opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	substring_t args[MAX_OPT_ARGS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	int opt_mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	int token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	int i, dest_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	int p_cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	options = kstrdup(buf, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (!options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	sep_opt = strstrip(options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	while ((p = strsep(&sep_opt, " ")) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		if (!*p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		token = match_token(p, rnbd_opt_tokens, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		opt_mask |= token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		switch (token) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		case RNBD_OPT_SESSNAME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			p = match_strdup(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 				ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			if (strlen(p) > NAME_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 				pr_err("map_device: sessname too long\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 				ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 				kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			strlcpy(opt->sessname, p, NAME_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		case RNBD_OPT_PATH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			if (p_cnt >= max_path_cnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 				pr_err("map_device: too many (> %zu) paths provided\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 				       max_path_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 				ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			p = match_strdup(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 				ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			ret = rtrs_addr_to_sockaddr(p, strlen(p),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 						    *opt->dest_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 						    &opt->paths[p_cnt]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 				pr_err("Can't parse path %s: %d\n", p, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 				kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			p_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		case RNBD_OPT_DEV_PATH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			p = match_strdup(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 				ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			if (strlen(p) > NAME_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				pr_err("map_device: Device path too long\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 				ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 				kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			strlcpy(opt->pathname, p, NAME_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		case RNBD_OPT_DEST_PORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			if (match_int(args, &dest_port) || dest_port < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			    dest_port > 65535) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 				pr_err("bad destination port number parameter '%d'\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 				       dest_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 				ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			*opt->dest_port = dest_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		case RNBD_OPT_ACCESS_MODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			p = match_strdup(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			if (!strcmp(p, "ro")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				*opt->access_mode = RNBD_ACCESS_RO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			} else if (!strcmp(p, "rw")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				*opt->access_mode = RNBD_ACCESS_RW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			} else if (!strcmp(p, "migration")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				*opt->access_mode = RNBD_ACCESS_MIGRATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 				pr_err("map_device: Invalid access_mode: '%s'\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				       p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 				ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 				kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			pr_err("map_device: Unknown parameter or missing value '%s'\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			       p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	for (i = 0; i < ARRAY_SIZE(rnbd_opt_mandatory); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if ((opt_mask & rnbd_opt_mandatory[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			pr_err("map_device: Parameters missing\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	*opt->path_cnt = p_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	kfree(options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static ssize_t state_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			  struct kobj_attribute *attr, char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	dev = container_of(kobj, struct rnbd_clt_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	switch (dev->dev_state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	case DEV_STATE_INIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return snprintf(page, PAGE_SIZE, "init\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	case DEV_STATE_MAPPED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		/* TODO fix cli tool before changing to proper state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return snprintf(page, PAGE_SIZE, "open\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	case DEV_STATE_MAPPED_DISCONNECTED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		/* TODO fix cli tool before changing to proper state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		return snprintf(page, PAGE_SIZE, "closed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	case DEV_STATE_UNMAPPED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return snprintf(page, PAGE_SIZE, "unmapped\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return snprintf(page, PAGE_SIZE, "unknown\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static struct kobj_attribute rnbd_clt_state_attr = __ATTR_RO(state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static ssize_t mapping_path_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 				 struct kobj_attribute *attr, char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	dev = container_of(kobj, struct rnbd_clt_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return scnprintf(page, PAGE_SIZE, "%s\n", dev->pathname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static struct kobj_attribute rnbd_clt_mapping_path_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	__ATTR_RO(mapping_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static ssize_t access_mode_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 				struct kobj_attribute *attr, char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	dev = container_of(kobj, struct rnbd_clt_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return snprintf(page, PAGE_SIZE, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			rnbd_access_mode_str(dev->access_mode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static struct kobj_attribute rnbd_clt_access_mode =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	__ATTR_RO(access_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static ssize_t rnbd_clt_unmap_dev_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 					struct kobj_attribute *attr, char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	return scnprintf(page, PAGE_SIZE, "Usage: echo <normal|force> > %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			 attr->attr.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static ssize_t rnbd_clt_unmap_dev_store(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 					 struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 					 const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	char *opt, *options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	bool force;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	opt = kstrdup(buf, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (!opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	options = strstrip(opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	dev = container_of(kobj, struct rnbd_clt_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (sysfs_streq(options, "normal")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		force = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	} else if (sysfs_streq(options, "force")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		force = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		rnbd_clt_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			      "unmap_device: Invalid value: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			      options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	rnbd_clt_info(dev, "Unmapping device, option: %s.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		       force ? "force" : "normal");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	 * We take explicit module reference only for one reason: do not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	 * race with lockless rnbd_destroy_sessions().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (!try_module_get(THIS_MODULE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	err = rnbd_clt_unmap_device(dev, force, &attr->attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		if (err != -EALREADY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			rnbd_clt_err(dev, "unmap_device: %d\n",  err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		goto module_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	 * Here device can be vanished!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	err = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) module_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	module_put(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	kfree(opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static struct kobj_attribute rnbd_clt_unmap_device_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	__ATTR(unmap_device, 0644, rnbd_clt_unmap_dev_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	       rnbd_clt_unmap_dev_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static ssize_t rnbd_clt_resize_dev_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 					 struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 					 char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	return scnprintf(page, PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 			 "Usage: echo <new size in sectors> > %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			 attr->attr.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static ssize_t rnbd_clt_resize_dev_store(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 					  struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 					  const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	unsigned long sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	dev = container_of(kobj, struct rnbd_clt_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	ret = kstrtoul(buf, 0, &sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	ret = rnbd_clt_resize_disk(dev, (size_t)sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) static struct kobj_attribute rnbd_clt_resize_dev_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	__ATTR(resize, 0644, rnbd_clt_resize_dev_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	       rnbd_clt_resize_dev_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static ssize_t rnbd_clt_remap_dev_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 					struct kobj_attribute *attr, char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	return scnprintf(page, PAGE_SIZE, "Usage: echo <1> > %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			 attr->attr.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) static ssize_t rnbd_clt_remap_dev_store(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 					 struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 					 const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	char *opt, *options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	opt = kstrdup(buf, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	if (!opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	options = strstrip(opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	dev = container_of(kobj, struct rnbd_clt_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	if (!sysfs_streq(options, "1")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		rnbd_clt_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 			      "remap_device: Invalid value: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			      options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	err = rnbd_clt_remap_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	if (likely(!err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		err = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	kfree(opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) static struct kobj_attribute rnbd_clt_remap_device_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	__ATTR(remap_device, 0644, rnbd_clt_remap_dev_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	       rnbd_clt_remap_dev_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static ssize_t session_show(struct kobject *kobj, struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 			    char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	dev = container_of(kobj, struct rnbd_clt_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	return scnprintf(page, PAGE_SIZE, "%s\n", dev->sess->sessname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) static struct kobj_attribute rnbd_clt_session_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	__ATTR_RO(session);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) static struct attribute *rnbd_dev_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	&rnbd_clt_unmap_device_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	&rnbd_clt_resize_dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	&rnbd_clt_remap_device_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	&rnbd_clt_mapping_path_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	&rnbd_clt_state_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	&rnbd_clt_session_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	&rnbd_clt_access_mode.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) void rnbd_clt_remove_dev_symlink(struct rnbd_clt_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	 * The module unload rnbd_client_exit path is racing with unmapping of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	 * the last single device from the sysfs manually
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	 * i.e. rnbd_clt_unmap_dev_store() leading to a sysfs warning because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	 * of sysfs link already was removed already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	if (dev->blk_symlink_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		if (try_module_get(THIS_MODULE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 			sysfs_remove_link(rnbd_devs_kobj, dev->blk_symlink_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 			module_put(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 		/* It should be freed always. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 		kfree(dev->blk_symlink_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 		dev->blk_symlink_name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) static struct kobj_type rnbd_dev_ktype = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	.sysfs_ops      = &kobj_sysfs_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 	.default_attrs  = rnbd_dev_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) static int rnbd_clt_add_dev_kobj(struct rnbd_clt_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	struct kobject *gd_kobj = &disk_to_dev(dev->gd)->kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	ret = kobject_init_and_add(&dev->kobj, &rnbd_dev_ktype, gd_kobj, "%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 				   "rnbd");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 		rnbd_clt_err(dev, "Failed to create device sysfs dir, err: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 			      ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) static ssize_t rnbd_clt_map_device_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 					 struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 					 char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 	return scnprintf(page, PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 			 "Usage: echo \"[dest_port=server port number] sessname=<name of the rtrs session> path=<[srcaddr@]dstaddr> [path=<[srcaddr@]dstaddr>] device_path=<full path on remote side> [access_mode=<ro|rw|migration>]\" > %s\n\naddr ::= [ ip:<ipv4> | ip:<ipv6> | gid:<gid> ]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 			 attr->attr.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) static int rnbd_clt_get_path_name(struct rnbd_clt_dev *dev, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 				   size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 	char pathname[NAME_MAX], *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 	strlcpy(pathname, dev->pathname, sizeof(pathname));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	while ((s = strchr(pathname, '/')))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 		s[0] = '!';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 	ret = snprintf(buf, len, "%s", pathname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 	if (ret >= len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 		return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static int rnbd_clt_add_dev_symlink(struct rnbd_clt_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 	struct kobject *gd_kobj = &disk_to_dev(dev->gd)->kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 	int ret, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 	len = strlen(dev->pathname) + strlen(dev->sess->sessname) + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	dev->blk_symlink_name = kzalloc(len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 	if (!dev->blk_symlink_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 		rnbd_clt_err(dev, "Failed to allocate memory for blk_symlink_name\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 	ret = rnbd_clt_get_path_name(dev, dev->blk_symlink_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 				      len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 		rnbd_clt_err(dev, "Failed to get /sys/block symlink path, err: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 			      ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 		goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 	ret = sysfs_create_link(rnbd_devs_kobj, gd_kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 				dev->blk_symlink_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 		rnbd_clt_err(dev, "Creating /sys/block symlink failed, err: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) 			      ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) 		goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) 	kfree(dev->blk_symlink_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 	dev->blk_symlink_name = NULL ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) static ssize_t rnbd_clt_map_device_store(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) 					  struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) 					  const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) 	struct rnbd_clt_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) 	struct rnbd_map_options opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 	char pathname[NAME_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) 	char sessname[NAME_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) 	enum rnbd_access_mode access_mode = RNBD_ACCESS_RW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 	u16 port_nr = RTRS_PORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) 	struct sockaddr_storage *addrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) 	struct rtrs_addr paths[6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) 	size_t path_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) 	opt.sessname = sessname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) 	opt.paths = paths;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) 	opt.path_cnt = &path_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) 	opt.pathname = pathname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) 	opt.dest_port = &port_nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) 	opt.access_mode = &access_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) 	addrs = kcalloc(ARRAY_SIZE(paths) * 2, sizeof(*addrs), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) 	if (!addrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) 	for (path_cnt = 0; path_cnt < ARRAY_SIZE(paths); path_cnt++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) 		paths[path_cnt].src = &addrs[path_cnt * 2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) 		paths[path_cnt].dst = &addrs[path_cnt * 2 + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) 	ret = rnbd_clt_parse_map_options(buf, ARRAY_SIZE(paths), &opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) 	pr_info("Mapping device %s on session %s, (access_mode: %s)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) 		pathname, sessname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) 		rnbd_access_mode_str(access_mode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) 	dev = rnbd_clt_map_device(sessname, paths, path_cnt, port_nr, pathname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) 				  access_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) 	if (IS_ERR(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) 		ret = PTR_ERR(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) 	ret = rnbd_clt_add_dev_kobj(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) 		goto unmap_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) 	ret = rnbd_clt_add_dev_symlink(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) 		goto unmap_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) 	kfree(addrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) unmap_dev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) 	rnbd_clt_unmap_device(dev, true, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) 	kfree(addrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) static struct kobj_attribute rnbd_clt_map_device_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) 	__ATTR(map_device, 0644,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) 	       rnbd_clt_map_device_show, rnbd_clt_map_device_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) static struct attribute *default_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) 	&rnbd_clt_map_device_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) static struct attribute_group default_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) 	.attrs = default_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) static const struct attribute_group *default_attr_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) 	&default_attr_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) int rnbd_clt_create_sysfs_files(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) 	rnbd_dev_class = class_create(THIS_MODULE, "rnbd-client");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) 	if (IS_ERR(rnbd_dev_class))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) 		return PTR_ERR(rnbd_dev_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) 	rnbd_dev = device_create_with_groups(rnbd_dev_class, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) 					      MKDEV(0, 0), NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) 					      default_attr_groups, "ctl");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) 	if (IS_ERR(rnbd_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) 		err = PTR_ERR(rnbd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) 		goto cls_destroy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) 	rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) 	if (!rnbd_devs_kobj) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) 		goto dev_destroy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) dev_destroy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) 	device_destroy(rnbd_dev_class, MKDEV(0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) cls_destroy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) 	class_destroy(rnbd_dev_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) void rnbd_clt_destroy_default_group(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) 	sysfs_remove_group(&rnbd_dev->kobj, &default_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) void rnbd_clt_destroy_sysfs_files(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) 	kobject_del(rnbd_devs_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) 	kobject_put(rnbd_devs_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) 	device_destroy(rnbd_dev_class, MKDEV(0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) 	class_destroy(rnbd_dev_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }