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fsclient.c
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fsclient.c
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/* AFS File Server client stubs
*
* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/circ_buf.h>
#include "internal.h"
#include "afs_fs.h"
/*
* decode an AFSFid block
*/
static void xdr_decode_AFSFid(const __be32 **_bp, struct afs_fid *fid)
{
const __be32 *bp = *_bp;
fid->vid = ntohl(*bp++);
fid->vnode = ntohl(*bp++);
fid->unique = ntohl(*bp++);
*_bp = bp;
}
/*
* decode an AFSFetchStatus block
*/
static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
struct afs_file_status *status,
struct afs_vnode *vnode,
afs_dataversion_t *store_version)
{
afs_dataversion_t expected_version;
const __be32 *bp = *_bp;
umode_t mode;
u64 data_version, size;
u32 changed = 0; /* becomes non-zero if ctime-type changes seen */
kuid_t owner;
kgid_t group;
#define EXTRACT(DST) \
do { \
u32 x = ntohl(*bp++); \
changed |= DST - x; \
DST = x; \
} while (0)
status->if_version = ntohl(*bp++);
EXTRACT(status->type);
EXTRACT(status->nlink);
size = ntohl(*bp++);
data_version = ntohl(*bp++);
EXTRACT(status->author);
owner = make_kuid(&init_user_ns, ntohl(*bp++));
changed |= !uid_eq(owner, status->owner);
status->owner = owner;
EXTRACT(status->caller_access); /* call ticket dependent */
EXTRACT(status->anon_access);
EXTRACT(status->mode);
EXTRACT(status->parent.vnode);
EXTRACT(status->parent.unique);
bp++; /* seg size */
status->mtime_client = ntohl(*bp++);
status->mtime_server = ntohl(*bp++);
group = make_kgid(&init_user_ns, ntohl(*bp++));
changed |= !gid_eq(group, status->group);
status->group = group;
bp++; /* sync counter */
data_version |= (u64) ntohl(*bp++) << 32;
EXTRACT(status->lock_count);
size |= (u64) ntohl(*bp++) << 32;
bp++; /* spare 4 */
*_bp = bp;
if (size != status->size) {
status->size = size;
changed |= true;
}
status->mode &= S_IALLUGO;
_debug("vnode time %lx, %lx",
status->mtime_client, status->mtime_server);
if (vnode) {
status->parent.vid = vnode->fid.vid;
if (changed && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
_debug("vnode changed");
i_size_write(&vnode->vfs_inode, size);
vnode->vfs_inode.i_uid = status->owner;
vnode->vfs_inode.i_gid = status->group;
vnode->vfs_inode.i_generation = vnode->fid.unique;
set_nlink(&vnode->vfs_inode, status->nlink);
mode = vnode->vfs_inode.i_mode;
mode &= ~S_IALLUGO;
mode |= status->mode;
barrier();
vnode->vfs_inode.i_mode = mode;
}
vnode->vfs_inode.i_ctime.tv_sec = status->mtime_server;
vnode->vfs_inode.i_mtime = vnode->vfs_inode.i_ctime;
vnode->vfs_inode.i_atime = vnode->vfs_inode.i_ctime;
vnode->vfs_inode.i_version = data_version;
}
expected_version = status->data_version;
if (store_version)
expected_version = *store_version;
if (expected_version != data_version) {
status->data_version = data_version;
if (vnode && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
_debug("vnode modified %llx on {%x:%u}",
(unsigned long long) data_version,
vnode->fid.vid, vnode->fid.vnode);
set_bit(AFS_VNODE_MODIFIED, &vnode->flags);
set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
}
} else if (store_version) {
status->data_version = data_version;
}
}
/*
* decode an AFSCallBack block
*/
static void xdr_decode_AFSCallBack(const __be32 **_bp, struct afs_vnode *vnode)
{
const __be32 *bp = *_bp;
vnode->cb_version = ntohl(*bp++);
vnode->cb_expiry = ntohl(*bp++);
vnode->cb_type = ntohl(*bp++);
vnode->cb_expires = vnode->cb_expiry + get_seconds();
*_bp = bp;
}
static void xdr_decode_AFSCallBack_raw(const __be32 **_bp,
struct afs_callback *cb)
{
const __be32 *bp = *_bp;
cb->version = ntohl(*bp++);
cb->expiry = ntohl(*bp++);
cb->type = ntohl(*bp++);
*_bp = bp;
}
/*
* decode an AFSVolSync block
*/
static void xdr_decode_AFSVolSync(const __be32 **_bp,
struct afs_volsync *volsync)
{
const __be32 *bp = *_bp;
volsync->creation = ntohl(*bp++);
bp++; /* spare2 */
bp++; /* spare3 */
bp++; /* spare4 */
bp++; /* spare5 */
bp++; /* spare6 */
*_bp = bp;
}
/*
* encode the requested attributes into an AFSStoreStatus block
*/
static void xdr_encode_AFS_StoreStatus(__be32 **_bp, struct iattr *attr)
{
__be32 *bp = *_bp;
u32 mask = 0, mtime = 0, owner = 0, group = 0, mode = 0;
mask = 0;
if (attr->ia_valid & ATTR_MTIME) {
mask |= AFS_SET_MTIME;
mtime = attr->ia_mtime.tv_sec;
}
if (attr->ia_valid & ATTR_UID) {
mask |= AFS_SET_OWNER;
owner = from_kuid(&init_user_ns, attr->ia_uid);
}
if (attr->ia_valid & ATTR_GID) {
mask |= AFS_SET_GROUP;
group = from_kgid(&init_user_ns, attr->ia_gid);
}
if (attr->ia_valid & ATTR_MODE) {
mask |= AFS_SET_MODE;
mode = attr->ia_mode & S_IALLUGO;
}
*bp++ = htonl(mask);
*bp++ = htonl(mtime);
*bp++ = htonl(owner);
*bp++ = htonl(group);
*bp++ = htonl(mode);
*bp++ = 0; /* segment size */
*_bp = bp;
}
/*
* decode an AFSFetchVolumeStatus block
*/
static void xdr_decode_AFSFetchVolumeStatus(const __be32 **_bp,
struct afs_volume_status *vs)
{
const __be32 *bp = *_bp;
vs->vid = ntohl(*bp++);
vs->parent_id = ntohl(*bp++);
vs->online = ntohl(*bp++);
vs->in_service = ntohl(*bp++);
vs->blessed = ntohl(*bp++);
vs->needs_salvage = ntohl(*bp++);
vs->type = ntohl(*bp++);
vs->min_quota = ntohl(*bp++);
vs->max_quota = ntohl(*bp++);
vs->blocks_in_use = ntohl(*bp++);
vs->part_blocks_avail = ntohl(*bp++);
vs->part_max_blocks = ntohl(*bp++);
*_bp = bp;
}
/*
* deliver reply data to an FS.FetchStatus
*/
static int afs_deliver_fs_fetch_status(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter(",,%u", last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
xdr_decode_AFSCallBack(&bp, vnode);
if (call->reply2)
xdr_decode_AFSVolSync(&bp, call->reply2);
_leave(" = 0 [done]");
return 0;
}
/*
* FS.FetchStatus operation type
*/
static const struct afs_call_type afs_RXFSFetchStatus = {
.name = "FS.FetchStatus",
.deliver = afs_deliver_fs_fetch_status,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* fetch the status information for a file
*/
int afs_fs_fetch_file_status(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
struct afs_volsync *volsync,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
__be32 *bp;
_enter(",%x,{%x:%u},,",
key_serial(key), vnode->fid.vid, vnode->fid.vnode);
call = afs_alloc_flat_call(&afs_RXFSFetchStatus, 16, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = volsync;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
bp[0] = htonl(FSFETCHSTATUS);
bp[1] = htonl(vnode->fid.vid);
bp[2] = htonl(vnode->fid.vnode);
bp[3] = htonl(vnode->fid.unique);
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.FetchData
*/
static int afs_deliver_fs_fetch_data(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
struct page *page;
void *buffer;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
switch (call->unmarshall) {
case 0:
call->offset = 0;
call->unmarshall++;
if (call->operation_ID != FSFETCHDATA64) {
call->unmarshall++;
goto no_msw;
}
/* extract the upper part of the returned data length of an
* FSFETCHDATA64 op (which should always be 0 using this
* client) */
case 1:
_debug("extract data length (MSW)");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}
call->count = ntohl(call->tmp);
_debug("DATA length MSW: %u", call->count);
if (call->count > 0)
return -EBADMSG;
call->offset = 0;
call->unmarshall++;
no_msw:
/* extract the returned data length */
case 2:
_debug("extract data length");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}
call->count = ntohl(call->tmp);
_debug("DATA length: %u", call->count);
if (call->count > PAGE_SIZE)
return -EBADMSG;
call->offset = 0;
call->unmarshall++;
/* extract the returned data */
case 3:
_debug("extract data");
if (call->count > 0) {
page = call->reply3;
buffer = kmap_atomic(page);
ret = afs_extract_data(call, skb, last, buffer,
call->count);
kunmap_atomic(buffer);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}
}
call->offset = 0;
call->unmarshall++;
/* extract the metadata */
case 4:
ret = afs_extract_data(call, skb, last, call->buffer,
(21 + 3 + 6) * 4);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
xdr_decode_AFSCallBack(&bp, vnode);
if (call->reply2)
xdr_decode_AFSVolSync(&bp, call->reply2);
call->offset = 0;
call->unmarshall++;
case 5:
_debug("trailer");
if (skb->len != 0)
return -EBADMSG;
break;
}
if (!last)
return 0;
if (call->count < PAGE_SIZE) {
_debug("clear");
page = call->reply3;
buffer = kmap_atomic(page);
memset(buffer + call->count, 0, PAGE_SIZE - call->count);
kunmap_atomic(buffer);
}
_leave(" = 0 [done]");
return 0;
}
/*
* FS.FetchData operation type
*/
static const struct afs_call_type afs_RXFSFetchData = {
.name = "FS.FetchData",
.deliver = afs_deliver_fs_fetch_data,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
static const struct afs_call_type afs_RXFSFetchData64 = {
.name = "FS.FetchData64",
.deliver = afs_deliver_fs_fetch_data,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* fetch data from a very large file
*/
static int afs_fs_fetch_data64(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
off_t offset, size_t length,
struct page *buffer,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
__be32 *bp;
_enter("");
ASSERTCMP(length, <, ULONG_MAX);
call = afs_alloc_flat_call(&afs_RXFSFetchData64, 32, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = NULL; /* volsync */
call->reply3 = buffer;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
call->operation_ID = FSFETCHDATA64;
/* marshall the parameters */
bp = call->request;
bp[0] = htonl(FSFETCHDATA64);
bp[1] = htonl(vnode->fid.vid);
bp[2] = htonl(vnode->fid.vnode);
bp[3] = htonl(vnode->fid.unique);
bp[4] = htonl(upper_32_bits(offset));
bp[5] = htonl((u32) offset);
bp[6] = 0;
bp[7] = htonl((u32) length);
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* fetch data from a file
*/
int afs_fs_fetch_data(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
off_t offset, size_t length,
struct page *buffer,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
__be32 *bp;
if (upper_32_bits(offset) || upper_32_bits(offset + length))
return afs_fs_fetch_data64(server, key, vnode, offset, length,
buffer, wait_mode);
_enter("");
call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = NULL; /* volsync */
call->reply3 = buffer;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
call->operation_ID = FSFETCHDATA;
/* marshall the parameters */
bp = call->request;
bp[0] = htonl(FSFETCHDATA);
bp[1] = htonl(vnode->fid.vid);
bp[2] = htonl(vnode->fid.vnode);
bp[3] = htonl(vnode->fid.unique);
bp[4] = htonl(offset);
bp[5] = htonl(length);
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.GiveUpCallBacks
*/
static int afs_deliver_fs_give_up_callbacks(struct afs_call *call,
struct sk_buff *skb, bool last)
{
_enter(",{%u},%d", skb->len, last);
if (skb->len > 0)
return -EBADMSG; /* shouldn't be any reply data */
return 0;
}
/*
* FS.GiveUpCallBacks operation type
*/
static const struct afs_call_type afs_RXFSGiveUpCallBacks = {
.name = "FS.GiveUpCallBacks",
.deliver = afs_deliver_fs_give_up_callbacks,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* give up a set of callbacks
* - the callbacks are held in the server->cb_break ring
*/
int afs_fs_give_up_callbacks(struct afs_server *server,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t ncallbacks;
__be32 *bp, *tp;
int loop;
ncallbacks = CIRC_CNT(server->cb_break_head, server->cb_break_tail,
ARRAY_SIZE(server->cb_break));
_enter("{%zu},", ncallbacks);
if (ncallbacks == 0)
return 0;
if (ncallbacks > AFSCBMAX)
ncallbacks = AFSCBMAX;
_debug("break %zu callbacks", ncallbacks);
call = afs_alloc_flat_call(&afs_RXFSGiveUpCallBacks,
12 + ncallbacks * 6 * 4, 0);
if (!call)
return -ENOMEM;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
tp = bp + 2 + ncallbacks * 3;
*bp++ = htonl(FSGIVEUPCALLBACKS);
*bp++ = htonl(ncallbacks);
*tp++ = htonl(ncallbacks);
atomic_sub(ncallbacks, &server->cb_break_n);
for (loop = ncallbacks; loop > 0; loop--) {
struct afs_callback *cb =
&server->cb_break[server->cb_break_tail];
*bp++ = htonl(cb->fid.vid);
*bp++ = htonl(cb->fid.vnode);
*bp++ = htonl(cb->fid.unique);
*tp++ = htonl(cb->version);
*tp++ = htonl(cb->expiry);
*tp++ = htonl(cb->type);
smp_mb();
server->cb_break_tail =
(server->cb_break_tail + 1) &
(ARRAY_SIZE(server->cb_break) - 1);
}
ASSERT(ncallbacks > 0);
wake_up_nr(&server->cb_break_waitq, ncallbacks);
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.CreateFile or an FS.MakeDir
*/
static int afs_deliver_fs_create_vnode(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->reply2);
xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL, NULL);
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
xdr_decode_AFSCallBack_raw(&bp, call->reply4);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.CreateFile and FS.MakeDir operation type
*/
static const struct afs_call_type afs_RXFSCreateXXXX = {
.name = "FS.CreateXXXX",
.deliver = afs_deliver_fs_create_vnode,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* create a file or make a directory
*/
int afs_fs_create(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
const char *name,
umode_t mode,
struct afs_fid *newfid,
struct afs_file_status *newstatus,
struct afs_callback *newcb,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz + (6 * 4);
call = afs_alloc_flat_call(&afs_RXFSCreateXXXX, reqsz,
(3 + 21 + 21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = newfid;
call->reply3 = newstatus;
call->reply4 = newcb;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(S_ISDIR(mode) ? FSMAKEDIR : FSCREATEFILE);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
*bp++ = htonl(AFS_SET_MODE);
*bp++ = 0; /* mtime */
*bp++ = 0; /* owner */
*bp++ = 0; /* group */
*bp++ = htonl(mode & S_IALLUGO); /* unix mode */
*bp++ = 0; /* segment size */
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.RemoveFile or FS.RemoveDir
*/
static int afs_deliver_fs_remove(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.RemoveDir/FS.RemoveFile operation type
*/
static const struct afs_call_type afs_RXFSRemoveXXXX = {
.name = "FS.RemoveXXXX",
.deliver = afs_deliver_fs_remove,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* remove a file or directory
*/
int afs_fs_remove(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
const char *name,
bool isdir,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz;
call = afs_alloc_flat_call(&afs_RXFSRemoveXXXX, reqsz, (21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(isdir ? FSREMOVEDIR : FSREMOVEFILE);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.Link
*/
static int afs_deliver_fs_link(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *dvnode = call->reply, *vnode = call->reply2;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
xdr_decode_AFSFetchStatus(&bp, &dvnode->status, dvnode, NULL);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.Link operation type
*/
static const struct afs_call_type afs_RXFSLink = {
.name = "FS.Link",
.deliver = afs_deliver_fs_link,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* make a hard link
*/
int afs_fs_link(struct afs_server *server,
struct key *key,
struct afs_vnode *dvnode,
struct afs_vnode *vnode,
const char *name,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz + (3 * 4);
call = afs_alloc_flat_call(&afs_RXFSLink, reqsz, (21 + 21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = dvnode;
call->reply2 = vnode;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSLINK);
*bp++ = htonl(dvnode->fid.vid);
*bp++ = htonl(dvnode->fid.vnode);
*bp++ = htonl(dvnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.Symlink
*/
static int afs_deliver_fs_symlink(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->reply2);
xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL, NULL);
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.Symlink operation type
*/
static const struct afs_call_type afs_RXFSSymlink = {
.name = "FS.Symlink",
.deliver = afs_deliver_fs_symlink,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* create a symbolic link
*/
int afs_fs_symlink(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
const char *name,
const char *contents,
struct afs_fid *newfid,
struct afs_file_status *newstatus,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz, c_namesz, c_padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
c_namesz = strlen(contents);
c_padsz = (4 - (c_namesz & 3)) & 3;
reqsz = (6 * 4) + namesz + padsz + c_namesz + c_padsz + (6 * 4);
call = afs_alloc_flat_call(&afs_RXFSSymlink, reqsz,
(3 + 21 + 21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = newfid;
call->reply3 = newstatus;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSSYMLINK);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
*bp++ = htonl(c_namesz);
memcpy(bp, contents, c_namesz);
bp = (void *) bp + c_namesz;
if (c_padsz > 0) {
memset(bp, 0, c_padsz);
bp = (void *) bp + c_padsz;
}
*bp++ = htonl(AFS_SET_MODE);
*bp++ = 0; /* mtime */
*bp++ = 0; /* owner */
*bp++ = 0; /* group */
*bp++ = htonl(S_IRWXUGO); /* unix mode */
*bp++ = 0; /* segment size */
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.Rename
*/
static int afs_deliver_fs_rename(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *orig_dvnode = call->reply, *new_dvnode = call->reply2;