xref: /openbmc/linux/fs/afs/vlclient.c (revision f3539c12d8196ce0a1993364d30b3a18908470d1)
1 /* AFS Volume Location Service client
2  *
3  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 
12 #include <linux/gfp.h>
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include "internal.h"
16 
17 /*
18  * map volume locator abort codes to error codes
19  */
20 static int afs_vl_abort_to_error(u32 abort_code)
21 {
22 	_enter("%u", abort_code);
23 
24 	switch (abort_code) {
25 	case AFSVL_IDEXIST:		return -EEXIST;
26 	case AFSVL_IO:			return -EREMOTEIO;
27 	case AFSVL_NAMEEXIST:		return -EEXIST;
28 	case AFSVL_CREATEFAIL:		return -EREMOTEIO;
29 	case AFSVL_NOENT:		return -ENOMEDIUM;
30 	case AFSVL_EMPTY:		return -ENOMEDIUM;
31 	case AFSVL_ENTDELETED:		return -ENOMEDIUM;
32 	case AFSVL_BADNAME:		return -EINVAL;
33 	case AFSVL_BADINDEX:		return -EINVAL;
34 	case AFSVL_BADVOLTYPE:		return -EINVAL;
35 	case AFSVL_BADSERVER:		return -EINVAL;
36 	case AFSVL_BADPARTITION:	return -EINVAL;
37 	case AFSVL_REPSFULL:		return -EFBIG;
38 	case AFSVL_NOREPSERVER:		return -ENOENT;
39 	case AFSVL_DUPREPSERVER:	return -EEXIST;
40 	case AFSVL_RWNOTFOUND:		return -ENOENT;
41 	case AFSVL_BADREFCOUNT:		return -EINVAL;
42 	case AFSVL_SIZEEXCEEDED:	return -EINVAL;
43 	case AFSVL_BADENTRY:		return -EINVAL;
44 	case AFSVL_BADVOLIDBUMP:	return -EINVAL;
45 	case AFSVL_IDALREADYHASHED:	return -EINVAL;
46 	case AFSVL_ENTRYLOCKED:		return -EBUSY;
47 	case AFSVL_BADVOLOPER:		return -EBADRQC;
48 	case AFSVL_BADRELLOCKTYPE:	return -EINVAL;
49 	case AFSVL_RERELEASE:		return -EREMOTEIO;
50 	case AFSVL_BADSERVERFLAG:	return -EINVAL;
51 	case AFSVL_PERM:		return -EACCES;
52 	case AFSVL_NOMEM:		return -EREMOTEIO;
53 	default:
54 		return afs_abort_to_error(abort_code);
55 	}
56 }
57 
58 /*
59  * deliver reply data to a VL.GetEntryByXXX call
60  */
61 static int afs_deliver_vl_get_entry_by_xxx(struct afs_call *call,
62 					   struct sk_buff *skb, bool last)
63 {
64 	struct afs_cache_vlocation *entry;
65 	__be32 *bp;
66 	u32 tmp;
67 	int loop, ret;
68 
69 	_enter(",,%u", last);
70 
71 	ret = afs_transfer_reply(call, skb, last);
72 	if (ret < 0)
73 		return ret;
74 
75 	/* unmarshall the reply once we've received all of it */
76 	entry = call->reply;
77 	bp = call->buffer;
78 
79 	for (loop = 0; loop < 64; loop++)
80 		entry->name[loop] = ntohl(*bp++);
81 	entry->name[loop] = 0;
82 	bp++; /* final NUL */
83 
84 	bp++; /* type */
85 	entry->nservers = ntohl(*bp++);
86 
87 	for (loop = 0; loop < 8; loop++)
88 		entry->servers[loop].s_addr = *bp++;
89 
90 	bp += 8; /* partition IDs */
91 
92 	for (loop = 0; loop < 8; loop++) {
93 		tmp = ntohl(*bp++);
94 		entry->srvtmask[loop] = 0;
95 		if (tmp & AFS_VLSF_RWVOL)
96 			entry->srvtmask[loop] |= AFS_VOL_VTM_RW;
97 		if (tmp & AFS_VLSF_ROVOL)
98 			entry->srvtmask[loop] |= AFS_VOL_VTM_RO;
99 		if (tmp & AFS_VLSF_BACKVOL)
100 			entry->srvtmask[loop] |= AFS_VOL_VTM_BAK;
101 	}
102 
103 	entry->vid[0] = ntohl(*bp++);
104 	entry->vid[1] = ntohl(*bp++);
105 	entry->vid[2] = ntohl(*bp++);
106 
107 	bp++; /* clone ID */
108 
109 	tmp = ntohl(*bp++); /* flags */
110 	entry->vidmask = 0;
111 	if (tmp & AFS_VLF_RWEXISTS)
112 		entry->vidmask |= AFS_VOL_VTM_RW;
113 	if (tmp & AFS_VLF_ROEXISTS)
114 		entry->vidmask |= AFS_VOL_VTM_RO;
115 	if (tmp & AFS_VLF_BACKEXISTS)
116 		entry->vidmask |= AFS_VOL_VTM_BAK;
117 	if (!entry->vidmask)
118 		return -EBADMSG;
119 
120 	_leave(" = 0 [done]");
121 	return 0;
122 }
123 
124 /*
125  * VL.GetEntryByName operation type
126  */
127 static const struct afs_call_type afs_RXVLGetEntryByName = {
128 	.name		= "VL.GetEntryByName",
129 	.deliver	= afs_deliver_vl_get_entry_by_xxx,
130 	.abort_to_error	= afs_vl_abort_to_error,
131 	.destructor	= afs_flat_call_destructor,
132 };
133 
134 /*
135  * VL.GetEntryById operation type
136  */
137 static const struct afs_call_type afs_RXVLGetEntryById = {
138 	.name		= "VL.GetEntryById",
139 	.deliver	= afs_deliver_vl_get_entry_by_xxx,
140 	.abort_to_error	= afs_vl_abort_to_error,
141 	.destructor	= afs_flat_call_destructor,
142 };
143 
144 /*
145  * dispatch a get volume entry by name operation
146  */
147 int afs_vl_get_entry_by_name(struct in_addr *addr,
148 			     struct key *key,
149 			     const char *volname,
150 			     struct afs_cache_vlocation *entry,
151 			     const struct afs_wait_mode *wait_mode)
152 {
153 	struct afs_call *call;
154 	size_t volnamesz, reqsz, padsz;
155 	__be32 *bp;
156 
157 	_enter("");
158 
159 	volnamesz = strlen(volname);
160 	padsz = (4 - (volnamesz & 3)) & 3;
161 	reqsz = 8 + volnamesz + padsz;
162 
163 	call = afs_alloc_flat_call(&afs_RXVLGetEntryByName, reqsz, 384);
164 	if (!call)
165 		return -ENOMEM;
166 
167 	call->key = key;
168 	call->reply = entry;
169 	call->service_id = VL_SERVICE;
170 	call->port = htons(AFS_VL_PORT);
171 
172 	/* marshall the parameters */
173 	bp = call->request;
174 	*bp++ = htonl(VLGETENTRYBYNAME);
175 	*bp++ = htonl(volnamesz);
176 	memcpy(bp, volname, volnamesz);
177 	if (padsz > 0)
178 		memset((void *) bp + volnamesz, 0, padsz);
179 
180 	/* initiate the call */
181 	return afs_make_call(addr, call, GFP_KERNEL, wait_mode);
182 }
183 
184 /*
185  * dispatch a get volume entry by ID operation
186  */
187 int afs_vl_get_entry_by_id(struct in_addr *addr,
188 			   struct key *key,
189 			   afs_volid_t volid,
190 			   afs_voltype_t voltype,
191 			   struct afs_cache_vlocation *entry,
192 			   const struct afs_wait_mode *wait_mode)
193 {
194 	struct afs_call *call;
195 	__be32 *bp;
196 
197 	_enter("");
198 
199 	call = afs_alloc_flat_call(&afs_RXVLGetEntryById, 12, 384);
200 	if (!call)
201 		return -ENOMEM;
202 
203 	call->key = key;
204 	call->reply = entry;
205 	call->service_id = VL_SERVICE;
206 	call->port = htons(AFS_VL_PORT);
207 
208 	/* marshall the parameters */
209 	bp = call->request;
210 	*bp++ = htonl(VLGETENTRYBYID);
211 	*bp++ = htonl(volid);
212 	*bp   = htonl(voltype);
213 
214 	/* initiate the call */
215 	return afs_make_call(addr, call, GFP_KERNEL, wait_mode);
216 }
217