1 /* AFS File Server client stubs
3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 #include <linux/init.h>
13 #include <linux/sched.h>
14 #include <linux/circ_buf.h>
19 * decode an AFSFetchStatus block
21 static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
22 struct afs_vnode *vnode)
24 const __be32 *bp = *_bp;
27 u32 changed = 0; /* becomes non-zero if ctime-type changes seen */
29 #define EXTRACT(DST) \
31 u32 x = ntohl(*bp++); \
36 vnode->status.if_version = ntohl(*bp++);
37 EXTRACT(vnode->status.type);
38 vnode->status.nlink = ntohl(*bp++);
39 EXTRACT(vnode->status.size);
40 data_version = ntohl(*bp++);
41 EXTRACT(vnode->status.author);
42 EXTRACT(vnode->status.owner);
43 EXTRACT(vnode->status.caller_access); /* call ticket dependent */
44 EXTRACT(vnode->status.anon_access);
45 EXTRACT(vnode->status.mode);
46 vnode->status.parent.vid = vnode->fid.vid;
47 EXTRACT(vnode->status.parent.vnode);
48 EXTRACT(vnode->status.parent.unique);
50 vnode->status.mtime_client = ntohl(*bp++);
51 vnode->status.mtime_server = ntohl(*bp++);
53 bp++; /* sync counter */
54 data_version |= (u64) ntohl(*bp++) << 32;
61 _debug("vnode changed");
62 set_bit(AFS_VNODE_CHANGED, &vnode->flags);
63 vnode->vfs_inode.i_uid = vnode->status.owner;
64 vnode->vfs_inode.i_size = vnode->status.size;
65 vnode->vfs_inode.i_version = vnode->fid.unique;
67 vnode->status.mode &= S_IALLUGO;
68 mode = vnode->vfs_inode.i_mode;
70 mode |= vnode->status.mode;
71 vnode->vfs_inode.i_mode = mode;
74 _debug("vnode time %lx, %lx",
75 vnode->status.mtime_client, vnode->status.mtime_server);
76 vnode->vfs_inode.i_ctime.tv_sec = vnode->status.mtime_server;
77 vnode->vfs_inode.i_mtime = vnode->vfs_inode.i_ctime;
78 vnode->vfs_inode.i_atime = vnode->vfs_inode.i_ctime;
80 if (vnode->status.data_version != data_version) {
81 _debug("vnode modified %llx", data_version);
82 vnode->status.data_version = data_version;
83 set_bit(AFS_VNODE_MODIFIED, &vnode->flags);
84 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
89 * decode an AFSCallBack block
91 static void xdr_decode_AFSCallBack(const __be32 **_bp, struct afs_vnode *vnode)
93 const __be32 *bp = *_bp;
95 vnode->cb_version = ntohl(*bp++);
96 vnode->cb_expiry = ntohl(*bp++);
97 vnode->cb_type = ntohl(*bp++);
98 vnode->cb_expires = vnode->cb_expiry + get_seconds();
103 * decode an AFSVolSync block
105 static void xdr_decode_AFSVolSync(const __be32 **_bp,
106 struct afs_volsync *volsync)
108 const __be32 *bp = *_bp;
110 volsync->creation = ntohl(*bp++);
120 * deliver reply data to an FS.FetchStatus
122 static int afs_deliver_fs_fetch_status(struct afs_call *call,
123 struct sk_buff *skb, bool last)
127 _enter(",,%u", last);
129 afs_transfer_reply(call, skb);
133 if (call->reply_size != call->reply_max)
136 /* unmarshall the reply once we've received all of it */
138 xdr_decode_AFSFetchStatus(&bp, call->reply);
139 xdr_decode_AFSCallBack(&bp, call->reply);
141 xdr_decode_AFSVolSync(&bp, call->reply2);
143 _leave(" = 0 [done]");
148 * FS.FetchStatus operation type
150 static const struct afs_call_type afs_RXFSFetchStatus = {
151 .name = "FS.FetchStatus",
152 .deliver = afs_deliver_fs_fetch_status,
153 .abort_to_error = afs_abort_to_error,
154 .destructor = afs_flat_call_destructor,
158 * fetch the status information for a file
160 int afs_fs_fetch_file_status(struct afs_server *server,
162 struct afs_vnode *vnode,
163 struct afs_volsync *volsync,
164 const struct afs_wait_mode *wait_mode)
166 struct afs_call *call;
169 _enter(",%x,,,", key_serial(key));
171 call = afs_alloc_flat_call(&afs_RXFSFetchStatus, 16, 120);
177 call->reply2 = volsync;
178 call->service_id = FS_SERVICE;
179 call->port = htons(AFS_FS_PORT);
181 /* marshall the parameters */
183 bp[0] = htonl(FSFETCHSTATUS);
184 bp[1] = htonl(vnode->fid.vid);
185 bp[2] = htonl(vnode->fid.vnode);
186 bp[3] = htonl(vnode->fid.unique);
188 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
192 * deliver reply data to an FS.FetchData
194 static int afs_deliver_fs_fetch_data(struct afs_call *call,
195 struct sk_buff *skb, bool last)
202 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
204 switch (call->unmarshall) {
209 /* extract the returned data length */
211 _debug("extract data length");
212 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
215 case -EAGAIN: return 0;
219 call->count = ntohl(call->tmp);
220 _debug("DATA length: %u", call->count);
221 if (call->count > PAGE_SIZE)
226 if (call->count < PAGE_SIZE) {
227 buffer = kmap_atomic(call->reply3, KM_USER0);
228 memset(buffer + PAGE_SIZE - call->count, 0,
230 kunmap_atomic(buffer, KM_USER0);
233 /* extract the returned data */
235 _debug("extract data");
237 buffer = kmap_atomic(page, KM_USER0);
238 ret = afs_extract_data(call, skb, last, buffer, call->count);
239 kunmap_atomic(buffer, KM_USER0);
242 case -EAGAIN: return 0;
249 /* extract the metadata */
251 ret = afs_extract_data(call, skb, last, call->buffer, 120);
254 case -EAGAIN: return 0;
259 xdr_decode_AFSFetchStatus(&bp, call->reply);
260 xdr_decode_AFSCallBack(&bp, call->reply);
262 xdr_decode_AFSVolSync(&bp, call->reply2);
277 _leave(" = 0 [done]");
282 * FS.FetchData operation type
284 static const struct afs_call_type afs_RXFSFetchData = {
285 .name = "FS.FetchData",
286 .deliver = afs_deliver_fs_fetch_data,
287 .abort_to_error = afs_abort_to_error,
288 .destructor = afs_flat_call_destructor,
292 * fetch data from a file
294 int afs_fs_fetch_data(struct afs_server *server,
296 struct afs_vnode *vnode,
297 off_t offset, size_t length,
299 struct afs_volsync *volsync,
300 const struct afs_wait_mode *wait_mode)
302 struct afs_call *call;
307 call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, 120);
313 call->reply2 = volsync;
314 call->reply3 = buffer;
315 call->service_id = FS_SERVICE;
316 call->port = htons(AFS_FS_PORT);
318 /* marshall the parameters */
320 bp[0] = htonl(FSFETCHDATA);
321 bp[1] = htonl(vnode->fid.vid);
322 bp[2] = htonl(vnode->fid.vnode);
323 bp[3] = htonl(vnode->fid.unique);
324 bp[4] = htonl(offset);
325 bp[5] = htonl(length);
327 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
331 * deliver reply data to an FS.GiveUpCallBacks
333 static int afs_deliver_fs_give_up_callbacks(struct afs_call *call,
334 struct sk_buff *skb, bool last)
336 _enter(",{%u},%d", skb->len, last);
339 return -EBADMSG; /* shouldn't be any reply data */
344 * FS.GiveUpCallBacks operation type
346 static const struct afs_call_type afs_RXFSGiveUpCallBacks = {
347 .name = "FS.GiveUpCallBacks",
348 .deliver = afs_deliver_fs_give_up_callbacks,
349 .abort_to_error = afs_abort_to_error,
350 .destructor = afs_flat_call_destructor,
354 * give up a set of callbacks
355 * - the callbacks are held in the server->cb_break ring
357 int afs_fs_give_up_callbacks(struct afs_server *server,
358 const struct afs_wait_mode *wait_mode)
360 struct afs_call *call;
365 ncallbacks = CIRC_CNT(server->cb_break_head, server->cb_break_tail,
366 ARRAY_SIZE(server->cb_break));
368 _enter("{%zu},", ncallbacks);
372 if (ncallbacks > AFSCBMAX)
373 ncallbacks = AFSCBMAX;
375 _debug("break %zu callbacks", ncallbacks);
377 call = afs_alloc_flat_call(&afs_RXFSGiveUpCallBacks,
378 12 + ncallbacks * 6 * 4, 0);
382 call->service_id = FS_SERVICE;
383 call->port = htons(AFS_FS_PORT);
385 /* marshall the parameters */
387 tp = bp + 2 + ncallbacks * 3;
388 *bp++ = htonl(FSGIVEUPCALLBACKS);
389 *bp++ = htonl(ncallbacks);
390 *tp++ = htonl(ncallbacks);
392 atomic_sub(ncallbacks, &server->cb_break_n);
393 for (loop = ncallbacks; loop > 0; loop--) {
394 struct afs_callback *cb =
395 &server->cb_break[server->cb_break_tail];
397 *bp++ = htonl(cb->fid.vid);
398 *bp++ = htonl(cb->fid.vnode);
399 *bp++ = htonl(cb->fid.unique);
400 *tp++ = htonl(cb->version);
401 *tp++ = htonl(cb->expiry);
402 *tp++ = htonl(cb->type);
404 server->cb_break_tail =
405 (server->cb_break_tail + 1) &
406 (ARRAY_SIZE(server->cb_break) - 1);
409 ASSERT(ncallbacks > 0);
410 wake_up_nr(&server->cb_break_waitq, ncallbacks);
412 return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);