xref: /illumos-gate/usr/src/cmd/mdb/common/modules/specfs/specfs.c (revision 892ad1623e11186cba8b2eb40d70318d2cb89605)
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
snode_walk_init(mdb_walk_state_t * wsp)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
snode_walk_step(mdb_walk_state_t * wsp)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 == 0) {
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
snode_walk_fini(mdb_walk_state_t * wsp)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
snode_cb(uintptr_t addr,const struct snode * snode,snode_cbdata_t * sd)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
snode(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)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
major2snode(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)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
dev2snode(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)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
snode_help(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 *
_mdb_init(void)278 _mdb_init(void)
279 {
280 	return (&modinfo);
281 }
282