usr/src/cmd/mdb/common/modules/specfs/specfs.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <mdb/mdb_modapi.h>
  27 #include <sys/types.h>
  28 #include <sys/sysmacros.h>
  29 #include <sys/time.h>
  30 #include <sys/vnode.h>
  31 #include <sys/fs/snode.h>
  32
  33 typedef struct snode_walk_data {
  34         int sw_stablesz;
  35         uintptr_t sw_stable;
  36 } snode_walk_data_t;
  37
  38 int
  39 snode_walk_init(mdb_walk_state_t *wsp)
  40 {
  41         int stablesz;
  42         GElf_Sym sym;
  43         uintptr_t stable;
  44         uintptr_t sp;
  45         snode_walk_data_t *sw;
  46
  47         if (mdb_readvar(&stablesz, "stablesz") == -1) {
  48                 mdb_warn("failed to read 'stablesz'");
  49                 return (WALK_ERR);
  50         }
  51
  52         if (stablesz == 0)
  53                 return (WALK_DONE);
  54
  55         if (mdb_lookup_by_name("stable", &sym) == -1) {
  56                 mdb_warn("failed to read 'stable'");
  57                 return (WALK_ERR);
  58         }
  59
  60         stable = (uintptr_t)sym.st_value;
  61
  62         if (mdb_vread(&sp, sizeof (sp), stable) == -1) {
  63                 mdb_warn("failed to read stable entry at %p", stable);
  64                 return (WALK_DONE);
  65         }
  66
  67         sw = mdb_alloc(sizeof (snode_walk_data_t), UM_SLEEP);
  68         sw->sw_stablesz = stablesz;
  69         sw->sw_stable = stable;
  70
  71         wsp->walk_addr = sp;
  72         wsp->walk_data = sw;
  73
  74         return (WALK_NEXT);
  75 }
  76
  77 int
  78 snode_walk_step(mdb_walk_state_t *wsp)
  79 {
  80         uintptr_t addr = wsp->walk_addr;
  81         snode_walk_data_t *sw = wsp->walk_data;
  82         struct snode *sp;
  83         struct snode snode;
  84
  85         while (addr == (uintptr_t)NULL) {
  86                 if (--sw->sw_stablesz == 0)
  87                         return (WALK_DONE);
  88
  89                 sw->sw_stable += sizeof (struct snode *);
  90
  91                 if (mdb_vread(&sp, sizeof (sp), sw->sw_stable) == -1) {
  92                         mdb_warn("failed to read stable entry at %p",
  93                             sw->sw_stable);
  94                         return (WALK_DONE);
  95                 }
  96                 addr = (uintptr_t)sp;
  97         }
  98
  99         if (mdb_vread(&snode, sizeof (snode), addr) == -1) {
 100                 mdb_warn("failed to read snode at %p", addr);
 101                 return (WALK_DONE);
 102         }
 103
 104         wsp->walk_addr = (uintptr_t)snode.s_next;
 105
 106         return (wsp->walk_callback(addr, &snode, wsp->walk_cbdata));
 107 }
 108
 109 void
 110 snode_walk_fini(mdb_walk_state_t *wsp)
 111 {
 112         mdb_free(wsp->walk_data, sizeof (snode_walk_data_t));
 113 }
 114
 115 typedef struct snode_cbdata {
 116         int sd_major;
 117         int sd_minor;
 118         int sd_verbose;
 119 } snode_cbdata_t;
 120
 121 static int
 122 snode_cb(uintptr_t addr, const struct snode *snode, snode_cbdata_t *sd)
 123 {
 124         static const mdb_bitmask_t s_flag_masks[] = {
 125                 { "UPD",        SUPD,           SUPD            },
 126                 { "ACC",        SACC,           SACC            },
 127                 { "CHG",        SCHG,           SCHG            },
 128                 { "PRIV",       SPRIV,          SPRIV           },
 129                 { "LOFFSET",    SLOFFSET,       SLOFFSET        },
 130                 { "LOCKED",     SLOCKED,        SLOCKED         },
 131                 { "WANT",       SWANT,          SWANT           },
 132                 { "CLONE",      SCLONE,         SCLONE          },
 133                 { "NEEDCLOSE",  SNEEDCLOSE,     SNEEDCLOSE      },
 134                 { "DIPSET",     SDIPSET,        SDIPSET         },
 135                 { "SIZEVALID",  SSIZEVALID,     SSIZEVALID      },
 136                 { "MUXED",      SMUXED,         SMUXED          },
 137                 { "SELFCLONE",  SSELFCLONE,     SSELFCLONE      },
 138                 { "NOFLUSH",    SNOFLUSH,       SNOFLUSH        },
 139                 { "CLOSING",    SCLOSING,       SCLOSING        },
 140                 { NULL,         0,              0               }
 141         };
 142
 143         int major = getmajor(snode->s_dev);
 144         int minor = getminor(snode->s_dev);
 145
 146         if (sd->sd_major != -1 && sd->sd_major != major)
 147                 return (WALK_NEXT);
 148
 149         if (sd->sd_minor != -1 && sd->sd_minor != minor)
 150                 return (WALK_NEXT);
 151
 152         if (sd->sd_verbose) {
 153                 mdb_printf("%0?p %?p %6d %16lx <%b>\n",
 154                     addr, snode->s_vnode, snode->s_count, snode->s_dev,
 155                     snode->s_flag, s_flag_masks);
 156         } else {
 157                 mdb_printf("%p\n", addr);
 158         }
 159
 160         return (WALK_NEXT);
 161 }
 162
 163 /*ARGSUSED*/
 164 int
 165 snode(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
 166 {
 167         snode_cbdata_t sd;
 168         struct snode snode;
 169         uintptr_t major = 0, dev = 0;
 170
 171         sd.sd_major = -1;
 172         sd.sd_minor = -1;
 173         sd.sd_verbose = !(flags & DCMD_PIPE_OUT);
 174
 175         if (mdb_getopts(argc, argv,
 176             'm', MDB_OPT_UINTPTR, &major,
 177             'd', MDB_OPT_UINTPTR, &dev, NULL) != argc)
 178                 return (DCMD_USAGE);
 179
 180         if (dev != 0) {
 181                 sd.sd_major = getmajor(dev);
 182                 sd.sd_minor = getminor(dev);
 183         }
 184
 185         if (major != 0)
 186                 sd.sd_major = major;
 187
 188         if (DCMD_HDRSPEC(flags) && !(flags & DCMD_PIPE_OUT)) {
 189                 mdb_printf("%<u>%?s %?s %6s %16s %-15s%</u>\n",
 190                     "ADDR", "VNODE", "COUNT", "DEV", "FLAG");
 191         }
 192
 193         if (!(flags & DCMD_ADDRSPEC)) {
 194                 if (mdb_walk("snode", (mdb_walk_cb_t)snode_cb, &sd) == -1) {
 195                         mdb_warn("can't walk snodes");
 196                         return (DCMD_ERR);
 197                 }
 198                 return (DCMD_OK);
 199         }
 200
 201         if (mdb_vread(&snode, sizeof (snode), addr) == -1) {
 202                 mdb_warn("failed to read snode structure at %p", addr);
 203                 return (DCMD_ERR);
 204         }
 205
 206         snode_cb(addr, &snode, &sd);
 207
 208         return (DCMD_OK);
 209 }
 210
 211 /*ARGSUSED3*/
 212 int
 213 major2snode(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
 214 {
 215         snode_cbdata_t sd;
 216
 217         if (!(flags & DCMD_ADDRSPEC) || argc != 0)
 218                 return (DCMD_USAGE);
 219
 220         sd.sd_major = addr;
 221         sd.sd_minor = -1;
 222         sd.sd_verbose = 0;
 223
 224         if (mdb_pwalk("snode", (mdb_walk_cb_t)snode_cb, &sd, 0) != 0)
 225                 return (DCMD_ERR);
 226
 227         return (DCMD_OK);
 228 }
 229
 230 /*ARGSUSED3*/
 231 int
 232 dev2snode(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
 233 {
 234         snode_cbdata_t sd;
 235
 236         if (!(flags & DCMD_ADDRSPEC) || argc != 0)
 237                 return (DCMD_USAGE);
 238
 239         sd.sd_major = getmajor(addr);
 240         sd.sd_minor = getminor(addr);
 241         sd.sd_verbose = 0;
 242
 243         if (mdb_pwalk("snode", (mdb_walk_cb_t)snode_cb, &sd, 0) != 0)
 244                 return (DCMD_ERR);
 245
 246         return (DCMD_OK);
 247 }
 248
 249 void
 250 snode_help(void)
 251 {
 252         mdb_printf("Options:\n"
 253             "   -d device  filter snodes of the specified dev_t\n"
 254             "   -m major   filter snodes of the specified major number\n");
 255 }
 256
 257 /*
 258  * MDB module linkage
 259  */
 260 static const mdb_dcmd_t dcmds[] = {
 261         { "dev2snode", ":", "given a dev_t, return the snode", dev2snode },
 262         { "major2snode", ":", "given a major number, return the snode(s)",
 263             major2snode },
 264         { "snode", "?[-d device] [-m major]",
 265                 "filter and display snode structures", snode, snode_help },
 266         { NULL }
 267 };
 268
 269 static const mdb_walker_t walkers[] = {
 270         { "snode", "walk global snode lists",
 271                 snode_walk_init, snode_walk_step, snode_walk_fini },
 272         { NULL }
 273 };
 274
 275 static const mdb_modinfo_t modinfo = { MDB_API_VERSION, dcmds, walkers };
 276
 277 const mdb_modinfo_t *
 278 _mdb_init(void)
 279 {
 280         return (&modinfo);
 281 }