drivers/staging/lustre/lustre/include/lustre_cfg.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #ifndef _LUSTRE_CFG_H
  34 #define _LUSTRE_CFG_H
  35
  36 /** \defgroup cfg cfg
  37  *
  38  * @{
  39  */
  40
  41 /*
  42  * 1cf6
  43  * lcfG
  44  */
  45 #define LUSTRE_CFG_VERSION 0x1cf60001
  46 #define LUSTRE_CFG_MAX_BUFCOUNT 8
  47
  48 #define LCFG_HDR_SIZE(count) \
  49         cfs_size_round(offsetof(struct lustre_cfg, lcfg_buflens[(count)]))
  50
  51 /** If the LCFG_REQUIRED bit is set in a configuration command,
  52  * then the client is required to understand this parameter
  53  * in order to mount the filesystem. If it does not understand
  54  * a REQUIRED command the client mount will fail.
  55  */
  56 #define LCFG_REQUIRED    0x0001000
  57
  58 enum lcfg_command_type {
  59         LCFG_ATTACH          = 0x00cf001, /**< create a new obd instance */
  60         LCFG_DETACH          = 0x00cf002, /**< destroy obd instance */
  61         LCFG_SETUP            = 0x00cf003, /**< call type-specific setup */
  62         LCFG_CLEANUP        = 0x00cf004, /**< call type-specific cleanup */
  63         LCFG_ADD_UUID      = 0x00cf005, /**< add a nid to a niduuid */
  64         LCFG_DEL_UUID      = 0x00cf006, /**< remove a nid from a niduuid */
  65         LCFG_MOUNTOPT      = 0x00cf007, /**< create a profile (mdc, osc) */
  66         LCFG_DEL_MOUNTOPT       = 0x00cf008, /**< destroy a profile */
  67         LCFG_SET_TIMEOUT        = 0x00cf009, /**< set obd_timeout */
  68         LCFG_SET_UPCALL  = 0x00cf00a, /**< deprecated */
  69         LCFG_ADD_CONN      = 0x00cf00b, /**< add a failover niduuid to an obd */
  70         LCFG_DEL_CONN      = 0x00cf00c, /**< remove a failover niduuid */
  71         LCFG_LOV_ADD_OBD        = 0x00cf00d, /**< add an osc to a lov */
  72         LCFG_LOV_DEL_OBD        = 0x00cf00e, /**< remove an osc from a lov */
  73         LCFG_PARAM            = 0x00cf00f, /**< set a proc parameter */
  74         LCFG_MARKER          = 0x00cf010, /**< metadata about next cfg rec */
  75         LCFG_LOG_START    = 0x00ce011, /**< mgc only, process a cfg log */
  76         LCFG_LOG_END        = 0x00ce012, /**< stop processing updates */
  77         LCFG_LOV_ADD_INA        = 0x00ce013, /**< like LOV_ADD_OBD, inactive */
  78         LCFG_ADD_MDC        = 0x00cf014, /**< add an mdc to a lmv */
  79         LCFG_DEL_MDC        = 0x00cf015, /**< remove an mdc from a lmv */
  80         LCFG_SPTLRPC_CONF       = 0x00ce016, /**< security */
  81         LCFG_POOL_NEW      = 0x00ce020, /**< create an ost pool name */
  82         LCFG_POOL_ADD      = 0x00ce021, /**< add an ost to a pool */
  83         LCFG_POOL_REM      = 0x00ce022, /**< remove an ost from a pool */
  84         LCFG_POOL_DEL      = 0x00ce023, /**< destroy an ost pool name */
  85         LCFG_SET_LDLM_TIMEOUT   = 0x00ce030, /**< set ldlm_timeout */
  86         LCFG_PRE_CLEANUP        = 0x00cf031, /**< call type-specific pre
  87                                               * cleanup cleanup
  88                                               */
  89         LCFG_SET_PARAM          = 0x00ce032, /**< use set_param syntax to set
  90                                               * a proc parameters
  91                                               */
  92 };
  93
  94 struct lustre_cfg_bufs {
  95         void    *lcfg_buf[LUSTRE_CFG_MAX_BUFCOUNT];
  96         __u32    lcfg_buflen[LUSTRE_CFG_MAX_BUFCOUNT];
  97         __u32    lcfg_bufcount;
  98 };
  99
 100 struct lustre_cfg {
 101         __u32 lcfg_version;
 102         __u32 lcfg_command;
 103
 104         __u32 lcfg_num;
 105         __u32 lcfg_flags;
 106         __u64 lcfg_nid;
 107         __u32 lcfg_nal;         /* not used any more */
 108
 109         __u32 lcfg_bufcount;
 110         __u32 lcfg_buflens[0];
 111 };
 112
 113 enum cfg_record_type {
 114         PORTALS_CFG_TYPE = 1,
 115         LUSTRE_CFG_TYPE = 123,
 116 };
 117
 118 #define LUSTRE_CFG_BUFLEN(lcfg, idx)        \
 119         ((lcfg)->lcfg_bufcount <= (idx)  \
 120          ? 0                                \
 121          : (lcfg)->lcfg_buflens[(idx)])
 122
 123 static inline void lustre_cfg_bufs_set(struct lustre_cfg_bufs *bufs,
 124                                        __u32               index,
 125                                        void                *buf,
 126                                        __u32               buflen)
 127 {
 128         if (index >= LUSTRE_CFG_MAX_BUFCOUNT)
 129                 return;
 130         if (!bufs)
 131                 return;
 132
 133         if (bufs->lcfg_bufcount <= index)
 134                 bufs->lcfg_bufcount = index + 1;
 135
 136         bufs->lcfg_buf[index]    = buf;
 137         bufs->lcfg_buflen[index] = buflen;
 138 }
 139
 140 static inline void lustre_cfg_bufs_set_string(struct lustre_cfg_bufs *bufs,
 141                                               __u32 index,
 142                                               char *str)
 143 {
 144         lustre_cfg_bufs_set(bufs, index, str, str ? strlen(str) + 1 : 0);
 145 }
 146
 147 static inline void lustre_cfg_bufs_reset(struct lustre_cfg_bufs *bufs, char *name)
 148 {
 149         memset((bufs), 0, sizeof(*bufs));
 150         if (name)
 151                 lustre_cfg_bufs_set_string(bufs, 0, name);
 152 }
 153
 154 static inline void *lustre_cfg_buf(struct lustre_cfg *lcfg, __u32 index)
 155 {
 156         __u32 i;
 157         size_t offset;
 158         __u32 bufcount;
 159
 160         bufcount = lcfg->lcfg_bufcount;
 161         if (index >= bufcount)
 162                 return NULL;
 163
 164         offset = LCFG_HDR_SIZE(lcfg->lcfg_bufcount);
 165         for (i = 0; i < index; i++)
 166                 offset += cfs_size_round(lcfg->lcfg_buflens[i]);
 167         return (char *)lcfg + offset;
 168 }
 169
 170 static inline void lustre_cfg_bufs_init(struct lustre_cfg_bufs *bufs,
 171                                         struct lustre_cfg *lcfg)
 172 {
 173         __u32 i;
 174
 175         bufs->lcfg_bufcount = lcfg->lcfg_bufcount;
 176         for (i = 0; i < bufs->lcfg_bufcount; i++) {
 177                 bufs->lcfg_buflen[i] = lcfg->lcfg_buflens[i];
 178                 bufs->lcfg_buf[i] = lustre_cfg_buf(lcfg, i);
 179         }
 180 }
 181
 182 static inline char *lustre_cfg_string(struct lustre_cfg *lcfg, __u32 index)
 183 {
 184         char *s;
 185
 186         if (lcfg->lcfg_buflens[index] == 0)
 187                 return NULL;
 188
 189         s = lustre_cfg_buf(lcfg, index);
 190         if (!s)
 191                 return NULL;
 192
 193         /*
 194          * make sure it's NULL terminated, even if this kills a char
 195          * of data.  Try to use the padding first though.
 196          */
 197         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 198                 size_t last = min((size_t)lcfg->lcfg_buflens[index],
 199                                   cfs_size_round(lcfg->lcfg_buflens[index]) - 1);
 200                 char lost = s[last];
 201
 202                 s[last] = '\0';
 203                 if (lost != '\0') {
 204                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 205                               index, s, lost);
 206                 }
 207         }
 208         return s;
 209 }
 210
 211 static inline __u32 lustre_cfg_len(__u32 bufcount, __u32 *buflens)
 212 {
 213         __u32 i;
 214         __u32 len;
 215
 216         len = LCFG_HDR_SIZE(bufcount);
 217         for (i = 0; i < bufcount; i++)
 218                 len += cfs_size_round(buflens[i]);
 219
 220         return cfs_size_round(len);
 221 }
 222
 223 #include "obd_support.h"
 224
 225 static inline struct lustre_cfg *lustre_cfg_new(int cmd,
 226                                                 struct lustre_cfg_bufs *bufs)
 227 {
 228         struct lustre_cfg *lcfg;
 229         char *ptr;
 230         int i;
 231
 232         lcfg = kzalloc(lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen),
 233                        GFP_NOFS);
 234         if (!lcfg)
 235                 return ERR_PTR(-ENOMEM);
 236
 237         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
 238         lcfg->lcfg_command = cmd;
 239         lcfg->lcfg_bufcount = bufs->lcfg_bufcount;
 240
 241         ptr = (char *)lcfg + LCFG_HDR_SIZE(lcfg->lcfg_bufcount);
 242         for (i = 0; i < lcfg->lcfg_bufcount; i++) {
 243                 lcfg->lcfg_buflens[i] = bufs->lcfg_buflen[i];
 244                 LOGL((char *)bufs->lcfg_buf[i], bufs->lcfg_buflen[i], ptr);
 245         }
 246         return lcfg;
 247 }
 248
 249 static inline void lustre_cfg_free(struct lustre_cfg *lcfg)
 250 {
 251         kfree(lcfg);
 252         return;
 253 }
 254
 255 static inline int lustre_cfg_sanity_check(void *buf, size_t len)
 256 {
 257         struct lustre_cfg *lcfg = (struct lustre_cfg *)buf;
 258
 259         if (!lcfg)
 260                 return -EINVAL;
 261
 262         /* check that the first bits of the struct are valid */
 263         if (len < LCFG_HDR_SIZE(0))
 264                 return -EINVAL;
 265
 266         if (lcfg->lcfg_version != LUSTRE_CFG_VERSION)
 267                 return -EINVAL;
 268
 269         if (lcfg->lcfg_bufcount >= LUSTRE_CFG_MAX_BUFCOUNT)
 270                 return -EINVAL;
 271
 272         /* check that the buflens are valid */
 273         if (len < LCFG_HDR_SIZE(lcfg->lcfg_bufcount))
 274                 return -EINVAL;
 275
 276         /* make sure all the pointers point inside the data */
 277         if (len < lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens))
 278                 return -EINVAL;
 279
 280         return 0;
 281 }
 282
 283 #include "lustre/lustre_user.h"
 284
 285 /** @} cfg */
 286
 287 #endif /* _LUSTRE_CFG_H */