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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef _LUSTRE_CFG_H
  38 #define _LUSTRE_CFG_H
  39
  40 /** \defgroup cfg cfg
  41  *
  42  * @{
  43  */
  44
  45 /*
  46  * 1cf6
  47  * lcfG
  48  */
  49 #define LUSTRE_CFG_VERSION 0x1cf60001
  50 #define LUSTRE_CFG_MAX_BUFCOUNT 8
  51
  52 #define LCFG_HDR_SIZE(count) \
  53     cfs_size_round(offsetof (struct lustre_cfg, lcfg_buflens[(count)]))
  54
  55 /** If the LCFG_REQUIRED bit is set in a configuration command,
  56  * then the client is required to understand this parameter
  57  * in order to mount the filesystem. If it does not understand
  58  * a REQUIRED command the client mount will fail. */
  59 #define LCFG_REQUIRED    0x0001000
  60
  61 enum lcfg_command_type {
  62         LCFG_ATTACH          = 0x00cf001, /**< create a new obd instance */
  63         LCFG_DETACH          = 0x00cf002, /**< destroy obd instance */
  64         LCFG_SETUP            = 0x00cf003, /**< call type-specific setup */
  65         LCFG_CLEANUP        = 0x00cf004, /**< call type-specific cleanup */
  66         LCFG_ADD_UUID      = 0x00cf005, /**< add a nid to a niduuid */
  67         LCFG_DEL_UUID      = 0x00cf006, /**< remove a nid from a niduuid */
  68         LCFG_MOUNTOPT      = 0x00cf007, /**< create a profile (mdc, osc) */
  69         LCFG_DEL_MOUNTOPT       = 0x00cf008, /**< destroy a profile */
  70         LCFG_SET_TIMEOUT        = 0x00cf009, /**< set obd_timeout */
  71         LCFG_SET_UPCALL  = 0x00cf00a, /**< deprecated */
  72         LCFG_ADD_CONN      = 0x00cf00b, /**< add a failover niduuid to an obd */
  73         LCFG_DEL_CONN      = 0x00cf00c, /**< remove a failover niduuid */
  74         LCFG_LOV_ADD_OBD        = 0x00cf00d, /**< add an osc to a lov */
  75         LCFG_LOV_DEL_OBD        = 0x00cf00e, /**< remove an osc from a lov */
  76         LCFG_PARAM            = 0x00cf00f, /**< set a proc parameter */
  77         LCFG_MARKER          = 0x00cf010, /**< metadata about next cfg rec */
  78         LCFG_LOG_START    = 0x00ce011, /**< mgc only, process a cfg log */
  79         LCFG_LOG_END        = 0x00ce012, /**< stop processing updates */
  80         LCFG_LOV_ADD_INA        = 0x00ce013, /**< like LOV_ADD_OBD, inactive */
  81         LCFG_ADD_MDC        = 0x00cf014, /**< add an mdc to a lmv */
  82         LCFG_DEL_MDC        = 0x00cf015, /**< remove an mdc from a lmv */
  83         LCFG_SPTLRPC_CONF       = 0x00ce016, /**< security */
  84         LCFG_POOL_NEW      = 0x00ce020, /**< create an ost pool name */
  85         LCFG_POOL_ADD      = 0x00ce021, /**< add an ost to a pool */
  86         LCFG_POOL_REM      = 0x00ce022, /**< remove an ost from a pool */
  87         LCFG_POOL_DEL      = 0x00ce023, /**< destroy an ost pool name */
  88         LCFG_SET_LDLM_TIMEOUT   = 0x00ce030, /**< set ldlm_timeout */
  89         LCFG_PRE_CLEANUP        = 0x00cf031, /**< call type-specific pre
  90                                               * cleanup cleanup */
  91         LCFG_SET_PARAM          = 0x00ce032, /**< use set_param syntax to set
  92                                               *a proc parameters */
  93 };
  94
  95 struct lustre_cfg_bufs {
  96         void    *lcfg_buf[LUSTRE_CFG_MAX_BUFCOUNT];
  97         __u32    lcfg_buflen[LUSTRE_CFG_MAX_BUFCOUNT];
  98         __u32    lcfg_bufcount;
  99 };
 100
 101 struct lustre_cfg {
 102         __u32 lcfg_version;
 103         __u32 lcfg_command;
 104
 105         __u32 lcfg_num;
 106         __u32 lcfg_flags;
 107         __u64 lcfg_nid;
 108         __u32 lcfg_nal;         /* not used any more */
 109
 110         __u32 lcfg_bufcount;
 111         __u32 lcfg_buflens[0];
 112 };
 113
 114 enum cfg_record_type {
 115         PORTALS_CFG_TYPE = 1,
 116         LUSTRE_CFG_TYPE = 123,
 117 };
 118
 119 #define LUSTRE_CFG_BUFLEN(lcfg, idx)        \
 120         ((lcfg)->lcfg_bufcount <= (idx)  \
 121          ? 0                                \
 122          : (lcfg)->lcfg_buflens[(idx)])
 123
 124 static inline void lustre_cfg_bufs_set(struct lustre_cfg_bufs *bufs,
 125                                        __u32               index,
 126                                        void                *buf,
 127                                        __u32               buflen)
 128 {
 129         if (index >= LUSTRE_CFG_MAX_BUFCOUNT)
 130                 return;
 131         if (bufs == NULL)
 132                 return;
 133
 134         if (bufs->lcfg_bufcount <= index)
 135                 bufs->lcfg_bufcount = index + 1;
 136
 137         bufs->lcfg_buf[index]    = buf;
 138         bufs->lcfg_buflen[index] = buflen;
 139 }
 140
 141 static inline void lustre_cfg_bufs_set_string(struct lustre_cfg_bufs *bufs,
 142                                               __u32 index,
 143                                               char *str)
 144 {
 145         lustre_cfg_bufs_set(bufs, index, str, str ? strlen(str) + 1 : 0);
 146 }
 147
 148 static inline void lustre_cfg_bufs_reset(struct lustre_cfg_bufs *bufs, char *name)
 149 {
 150         memset((bufs), 0, sizeof(*bufs));
 151         if (name)
 152                 lustre_cfg_bufs_set_string(bufs, 0, name);
 153 }
 154
 155 static inline void *lustre_cfg_buf(struct lustre_cfg *lcfg, int index)
 156 {
 157         int i;
 158         int offset;
 159         int bufcount;
 160
 161         LASSERT (lcfg != NULL);
 162         LASSERT (index >= 0);
 163
 164         bufcount = lcfg->lcfg_bufcount;
 165         if (index >= bufcount)
 166                 return NULL;
 167
 168         offset = LCFG_HDR_SIZE(lcfg->lcfg_bufcount);
 169         for (i = 0; i < index; i++)
 170                 offset += cfs_size_round(lcfg->lcfg_buflens[i]);
 171         return (char *)lcfg + offset;
 172 }
 173
 174 static inline void lustre_cfg_bufs_init(struct lustre_cfg_bufs *bufs,
 175                                         struct lustre_cfg *lcfg)
 176 {
 177         int i;
 178
 179         bufs->lcfg_bufcount = lcfg->lcfg_bufcount;
 180         for (i = 0; i < bufs->lcfg_bufcount; i++) {
 181                 bufs->lcfg_buflen[i] = lcfg->lcfg_buflens[i];
 182                 bufs->lcfg_buf[i] = lustre_cfg_buf(lcfg, i);
 183         }
 184 }
 185
 186 static inline char *lustre_cfg_string(struct lustre_cfg *lcfg, int index)
 187 {
 188         char *s;
 189
 190         if (lcfg->lcfg_buflens[index] == 0)
 191                 return NULL;
 192
 193         s = lustre_cfg_buf(lcfg, index);
 194         if (s == NULL)
 195                 return NULL;
 196
 197         /*
 198          * make sure it's NULL terminated, even if this kills a char
 199          * of data.  Try to use the padding first though.
 200          */
 201         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 202                 int last = min((int)lcfg->lcfg_buflens[index],
 203                                cfs_size_round(lcfg->lcfg_buflens[index]) - 1);
 204                 char lost = s[last];
 205
 206                 s[last] = '\0';
 207                 if (lost != '\0') {
 208                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 209                               index, s, lost);
 210                 }
 211         }
 212         return s;
 213 }
 214
 215 static inline int lustre_cfg_len(__u32 bufcount, __u32 *buflens)
 216 {
 217         int i;
 218         int len;
 219
 220         len = LCFG_HDR_SIZE(bufcount);
 221         for (i = 0; i < bufcount; i++)
 222                 len += cfs_size_round(buflens[i]);
 223
 224         return cfs_size_round(len);
 225 }
 226
 227 #include "obd_support.h"
 228
 229 static inline struct lustre_cfg *lustre_cfg_new(int cmd,
 230                                                 struct lustre_cfg_bufs *bufs)
 231 {
 232         struct lustre_cfg *lcfg;
 233         char *ptr;
 234         int i;
 235
 236         lcfg = kzalloc(lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen),
 237                        GFP_NOFS);
 238         if (!lcfg)
 239                 return ERR_PTR(-ENOMEM);
 240
 241         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
 242         lcfg->lcfg_command = cmd;
 243         lcfg->lcfg_bufcount = bufs->lcfg_bufcount;
 244
 245         ptr = (char *)lcfg + LCFG_HDR_SIZE(lcfg->lcfg_bufcount);
 246         for (i = 0; i < lcfg->lcfg_bufcount; i++) {
 247                 lcfg->lcfg_buflens[i] = bufs->lcfg_buflen[i];
 248                 LOGL((char *)bufs->lcfg_buf[i], bufs->lcfg_buflen[i], ptr);
 249         }
 250         return lcfg;
 251 }
 252
 253 static inline void lustre_cfg_free(struct lustre_cfg *lcfg)
 254 {
 255         int len;
 256
 257         len = lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens);
 258
 259         kfree(lcfg);
 260         return;
 261 }
 262
 263 static inline int lustre_cfg_sanity_check(void *buf, int len)
 264 {
 265         struct lustre_cfg *lcfg = (struct lustre_cfg *)buf;
 266
 267         if (!lcfg)
 268                 return -EINVAL;
 269
 270         /* check that the first bits of the struct are valid */
 271         if (len < LCFG_HDR_SIZE(0))
 272                 return -EINVAL;
 273
 274         if (lcfg->lcfg_version != LUSTRE_CFG_VERSION)
 275                 return -EINVAL;
 276
 277         if (lcfg->lcfg_bufcount >= LUSTRE_CFG_MAX_BUFCOUNT)
 278                 return -EINVAL;
 279
 280         /* check that the buflens are valid */
 281         if (len < LCFG_HDR_SIZE(lcfg->lcfg_bufcount))
 282                 return -EINVAL;
 283
 284         /* make sure all the pointers point inside the data */
 285         if (len < lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens))
 286                 return -EINVAL;
 287
 288         return 0;
 289 }
 290
 291 #include "lustre/lustre_user.h"
 292
 293 /** @} cfg */
 294
 295 #endif /* _LUSTRE_CFG_H */