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fsclient.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* AFS File Server client stubs
*
* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/circ_buf.h>
#include <linux/iversion.h>
#include "internal.h"
#include "afs_fs.h"
#include "xdr_fs.h"
#include "protocol_yfs.h"
static inline void afs_use_fs_server(struct afs_call *call, struct afs_cb_interest *cbi)
{
call->cbi = afs_get_cb_interest(cbi);
}
/*
* 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;
}
/*
* Dump a bad file status record.
*/
static void xdr_dump_bad(const __be32 *bp)
{
__be32 x[4];
int i;
pr_notice("AFS XDR: Bad status record\n");
for (i = 0; i < 5 * 4 * 4; i += 16) {
memcpy(x, bp, 16);
bp += 4;
pr_notice("%03x: %08x %08x %08x %08x\n",
i, ntohl(x[0]), ntohl(x[1]), ntohl(x[2]), ntohl(x[3]));
}
memcpy(x, bp, 4);
pr_notice("0x50: %08x\n", ntohl(x[0]));
}
/*
* decode an AFSFetchStatus block
*/
static int xdr_decode_AFSFetchStatus(const __be32 **_bp,
struct afs_call *call,
struct afs_status_cb *scb)
{
const struct afs_xdr_AFSFetchStatus *xdr = (const void *)*_bp;
struct afs_file_status *status = &scb->status;
bool inline_error = (call->operation_ID == afs_FS_InlineBulkStatus);
u64 data_version, size;
u32 type, abort_code;
abort_code = ntohl(xdr->abort_code);
if (xdr->if_version != htonl(AFS_FSTATUS_VERSION)) {
if (xdr->if_version == htonl(0) &&
abort_code != 0 &&
inline_error) {
/* The OpenAFS fileserver has a bug in FS.InlineBulkStatus
* whereby it doesn't set the interface version in the error
* case.
*/
status->abort_code = abort_code;
scb->have_error = true;
return 0;
}
pr_warn("Unknown AFSFetchStatus version %u\n", ntohl(xdr->if_version));
goto bad;
}
if (abort_code != 0 && inline_error) {
status->abort_code = abort_code;
return 0;
}
type = ntohl(xdr->type);
switch (type) {
case AFS_FTYPE_FILE:
case AFS_FTYPE_DIR:
case AFS_FTYPE_SYMLINK:
status->type = type;
break;
default:
goto bad;
}
status->nlink = ntohl(xdr->nlink);
status->author = ntohl(xdr->author);
status->owner = ntohl(xdr->owner);
status->caller_access = ntohl(xdr->caller_access); /* Ticket dependent */
status->anon_access = ntohl(xdr->anon_access);
status->mode = ntohl(xdr->mode) & S_IALLUGO;
status->group = ntohl(xdr->group);
status->lock_count = ntohl(xdr->lock_count);
status->mtime_client.tv_sec = ntohl(xdr->mtime_client);
status->mtime_client.tv_nsec = 0;
status->mtime_server.tv_sec = ntohl(xdr->mtime_server);
status->mtime_server.tv_nsec = 0;
size = (u64)ntohl(xdr->size_lo);
size |= (u64)ntohl(xdr->size_hi) << 32;
status->size = size;
data_version = (u64)ntohl(xdr->data_version_lo);
data_version |= (u64)ntohl(xdr->data_version_hi) << 32;
status->data_version = data_version;
scb->have_status = true;
*_bp = (const void *)*_bp + sizeof(*xdr);
return 0;
bad:
xdr_dump_bad(*_bp);
return afs_protocol_error(call, -EBADMSG, afs_eproto_bad_status);
}
static time64_t xdr_decode_expiry(struct afs_call *call, u32 expiry)
{
return ktime_divns(call->reply_time, NSEC_PER_SEC) + expiry;
}
static void xdr_decode_AFSCallBack(const __be32 **_bp,
struct afs_call *call,
struct afs_status_cb *scb)
{
struct afs_callback *cb = &scb->callback;
const __be32 *bp = *_bp;
bp++; /* version */
cb->expires_at = xdr_decode_expiry(call, ntohl(*bp++));
bp++; /* type */
scb->have_cb = true;
*_bp = bp;
}
/*
* decode an AFSVolSync block
*/
static void xdr_decode_AFSVolSync(const __be32 **_bp,
struct afs_volsync *volsync)
{
const __be32 *bp = *_bp;
u32 creation;
creation = ntohl(*bp++);
bp++; /* spare2 */
bp++; /* spare3 */
bp++; /* spare4 */
bp++; /* spare5 */
bp++; /* spare6 */
*_bp = bp;
if (volsync)
volsync->creation = creation;
}
/*
* 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++);
vs->vol_copy_date = 0;
vs->vol_backup_date = 0;
*_bp = bp;
}
/*
* deliver reply data to an FS.FetchStatus
*/
static int afs_deliver_fs_fetch_status_vnode(struct afs_call *call)
{
const __be32 *bp;
int ret;
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
if (ret < 0)
return ret;
xdr_decode_AFSCallBack(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
}
/*
* FS.FetchStatus operation type
*/
static const struct afs_call_type afs_RXFSFetchStatus_vnode = {
.name = "FS.FetchStatus(vnode)",
.op = afs_FS_FetchStatus,
.deliver = afs_deliver_fs_fetch_status_vnode,
.destructor = afs_flat_call_destructor,
};
/*
* fetch the status information for a file
*/
int afs_fs_fetch_file_status(struct afs_fs_cursor *fc, struct afs_status_cb *scb,
struct afs_volsync *volsync)
{
struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (test_bit(AFS_SERVER_FL_IS_YFS, &fc->cbi->server->flags))
return yfs_fs_fetch_file_status(fc, scb, volsync);
_enter(",%x,{%llx:%llu},,",
key_serial(fc->key), vnode->fid.vid, vnode->fid.vnode);
call = afs_alloc_flat_call(net, &afs_RXFSFetchStatus_vnode,
16, (21 + 3 + 6) * 4);
if (!call) {
fc->ac.error = -ENOMEM;
return -ENOMEM;
}
call->key = fc->key;
call->out_scb = scb;
call->out_volsync = volsync;
/* 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);
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call(call, &vnode->fid);
afs_set_fc_call(call, fc);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* deliver reply data to an FS.FetchData
*/
static int afs_deliver_fs_fetch_data(struct afs_call *call)
{
struct afs_read *req = call->read_request;
const __be32 *bp;
unsigned int size;
int ret;
_enter("{%u,%zu/%llu}",
call->unmarshall, iov_iter_count(call->iter), req->actual_len);
switch (call->unmarshall) {
case 0:
req->actual_len = 0;
req->index = 0;
req->offset = req->pos & (PAGE_SIZE - 1);
call->unmarshall++;
if (call->operation_ID == FSFETCHDATA64) {
afs_extract_to_tmp64(call);
} else {
call->tmp_u = htonl(0);
afs_extract_to_tmp(call);
}
/* Fall through */
/* extract the returned data length */
case 1:
_debug("extract data length");
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
req->actual_len = be64_to_cpu(call->tmp64);
_debug("DATA length: %llu", req->actual_len);
req->remain = min(req->len, req->actual_len);
if (req->remain == 0)
goto no_more_data;
call->unmarshall++;
begin_page:
ASSERTCMP(req->index, <, req->nr_pages);
if (req->remain > PAGE_SIZE - req->offset)
size = PAGE_SIZE - req->offset;
else
size = req->remain;
call->bvec[0].bv_len = size;
call->bvec[0].bv_offset = req->offset;
call->bvec[0].bv_page = req->pages[req->index];
iov_iter_bvec(&call->def_iter, READ, call->bvec, 1, size);
ASSERTCMP(size, <=, PAGE_SIZE);
/* Fall through */
/* extract the returned data */
case 2:
_debug("extract data %zu/%llu",
iov_iter_count(call->iter), req->remain);
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
req->remain -= call->bvec[0].bv_len;
req->offset += call->bvec[0].bv_len;
ASSERTCMP(req->offset, <=, PAGE_SIZE);
if (req->offset == PAGE_SIZE) {
req->offset = 0;
if (req->page_done)
req->page_done(req);
req->index++;
if (req->remain > 0)
goto begin_page;
}
ASSERTCMP(req->remain, ==, 0);
if (req->actual_len <= req->len)
goto no_more_data;
/* Discard any excess data the server gave us */
afs_extract_discard(call, req->actual_len - req->len);
call->unmarshall = 3;
/* Fall through */
case 3:
_debug("extract discard %zu/%llu",
iov_iter_count(call->iter), req->actual_len - req->len);
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
no_more_data:
call->unmarshall = 4;
afs_extract_to_buf(call, (21 + 3 + 6) * 4);
/* Fall through */
/* extract the metadata */
case 4:
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
bp = call->buffer;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
if (ret < 0)
return ret;
xdr_decode_AFSCallBack(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);
req->data_version = call->out_scb->status.data_version;
req->file_size = call->out_scb->status.size;
call->unmarshall++;
case 5:
break;
}
for (; req->index < req->nr_pages; req->index++) {
if (req->offset < PAGE_SIZE)
zero_user_segment(req->pages[req->index],
req->offset, PAGE_SIZE);
if (req->page_done)
req->page_done(req);
req->offset = 0;
}
_leave(" = 0 [done]");
return 0;
}
static void afs_fetch_data_destructor(struct afs_call *call)
{
struct afs_read *req = call->read_request;
afs_put_read(req);
afs_flat_call_destructor(call);
}
/*
* FS.FetchData operation type
*/
static const struct afs_call_type afs_RXFSFetchData = {
.name = "FS.FetchData",
.op = afs_FS_FetchData,
.deliver = afs_deliver_fs_fetch_data,
.destructor = afs_fetch_data_destructor,
};
static const struct afs_call_type afs_RXFSFetchData64 = {
.name = "FS.FetchData64",
.op = afs_FS_FetchData64,
.deliver = afs_deliver_fs_fetch_data,
.destructor = afs_fetch_data_destructor,
};
/*
* fetch data from a very large file
*/
static int afs_fs_fetch_data64(struct afs_fs_cursor *fc,
struct afs_status_cb *scb,
struct afs_read *req)
{
struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
_enter("");
call = afs_alloc_flat_call(net, &afs_RXFSFetchData64, 32, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = fc->key;
call->out_scb = scb;
call->out_volsync = NULL;
call->read_request = afs_get_read(req);
/* 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(req->pos));
bp[5] = htonl(lower_32_bits(req->pos));
bp[6] = 0;
bp[7] = htonl(lower_32_bits(req->len));
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call(call, &vnode->fid);
afs_set_fc_call(call, fc);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* fetch data from a file
*/
int afs_fs_fetch_data(struct afs_fs_cursor *fc,
struct afs_status_cb *scb,
struct afs_read *req)
{
struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
if (test_bit(AFS_SERVER_FL_IS_YFS, &fc->cbi->server->flags))
return yfs_fs_fetch_data(fc, scb, req);
if (upper_32_bits(req->pos) ||
upper_32_bits(req->len) ||
upper_32_bits(req->pos + req->len))
return afs_fs_fetch_data64(fc, scb, req);
_enter("");
call = afs_alloc_flat_call(net, &afs_RXFSFetchData, 24, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = fc->key;
call->out_scb = scb;
call->out_volsync = NULL;
call->read_request = afs_get_read(req);
/* 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(lower_32_bits(req->pos));
bp[5] = htonl(lower_32_bits(req->len));
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call(call, &vnode->fid);
afs_set_fc_call(call, fc);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* deliver reply data to an FS.CreateFile or an FS.MakeDir
*/
static int afs_deliver_fs_create_vnode(struct afs_call *call)
{
const __be32 *bp;
int ret;
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->out_fid);
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
if (ret < 0)
return ret;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
if (ret < 0)
return ret;
xdr_decode_AFSCallBack(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
}
/*
* FS.CreateFile and FS.MakeDir operation type
*/
static const struct afs_call_type afs_RXFSCreateFile = {
.name = "FS.CreateFile",
.op = afs_FS_CreateFile,
.deliver = afs_deliver_fs_create_vnode,
.destructor = afs_flat_call_destructor,
};
static const struct afs_call_type afs_RXFSMakeDir = {
.name = "FS.MakeDir",
.op = afs_FS_MakeDir,
.deliver = afs_deliver_fs_create_vnode,
.destructor = afs_flat_call_destructor,
};
/*
* create a file or make a directory
*/
int afs_fs_create(struct afs_fs_cursor *fc,
const char *name,
umode_t mode,
struct afs_status_cb *dvnode_scb,
struct afs_fid *newfid,
struct afs_status_cb *new_scb)
{
struct afs_vnode *dvnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(dvnode);
size_t namesz, reqsz, padsz;
__be32 *bp;
if (test_bit(AFS_SERVER_FL_IS_YFS, &fc->cbi->server->flags)){
if (S_ISDIR(mode))
return yfs_fs_make_dir(fc, name, mode, dvnode_scb,
newfid, new_scb);
else
return yfs_fs_create_file(fc, name, mode, dvnode_scb,
newfid, new_scb);
}
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz + (6 * 4);
call = afs_alloc_flat_call(
net, S_ISDIR(mode) ? &afs_RXFSMakeDir : &afs_RXFSCreateFile,
reqsz, (3 + 21 + 21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = fc->key;
call->out_dir_scb = dvnode_scb;
call->out_fid = newfid;
call->out_scb = new_scb;
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(S_ISDIR(mode) ? FSMAKEDIR : FSCREATEFILE);
*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(AFS_SET_MODE | AFS_SET_MTIME);
*bp++ = htonl(dvnode->vfs_inode.i_mtime.tv_sec); /* mtime */
*bp++ = 0; /* owner */
*bp++ = 0; /* group */
*bp++ = htonl(mode & S_IALLUGO); /* unix mode */
*bp++ = 0; /* segment size */
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call1(call, &dvnode->fid, name);
afs_set_fc_call(call, fc);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* Deliver reply data to any operation that returns directory status and volume
* sync.
*/
static int afs_deliver_fs_dir_status_and_vol(struct afs_call *call)
{
const __be32 *bp;
int ret;
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
if (ret < 0)
return ret;
xdr_decode_AFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
}
/*
* FS.RemoveDir/FS.RemoveFile operation type
*/
static const struct afs_call_type afs_RXFSRemoveFile = {
.name = "FS.RemoveFile",
.op = afs_FS_RemoveFile,
.deliver = afs_deliver_fs_dir_status_and_vol,
.destructor = afs_flat_call_destructor,
};
static const struct afs_call_type afs_RXFSRemoveDir = {
.name = "FS.RemoveDir",
.op = afs_FS_RemoveDir,
.deliver = afs_deliver_fs_dir_status_and_vol,
.destructor = afs_flat_call_destructor,
};
/*
* remove a file or directory
*/
int afs_fs_remove(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
const char *name, bool isdir, struct afs_status_cb *dvnode_scb)
{
struct afs_vnode *dvnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(dvnode);
size_t namesz, reqsz, padsz;
__be32 *bp;
if (test_bit(AFS_SERVER_FL_IS_YFS, &fc->cbi->server->flags))
return yfs_fs_remove(fc, vnode, name, isdir, dvnode_scb);
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz;
call = afs_alloc_flat_call(
net, isdir ? &afs_RXFSRemoveDir : &afs_RXFSRemoveFile,
reqsz, (21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = fc->key;
call->out_dir_scb = dvnode_scb;
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(isdir ? FSREMOVEDIR : FSREMOVEFILE);
*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;
}
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call1(call, &dvnode->fid, name);
afs_set_fc_call(call, fc);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* deliver reply data to an FS.Link
*/
static int afs_deliver_fs_link(struct afs_call *call)
{
const __be32 *bp;
int ret;
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
if (ret < 0)
return ret;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
if (ret < 0)
return ret;
xdr_decode_AFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
}
/*
* FS.Link operation type
*/
static const struct afs_call_type afs_RXFSLink = {
.name = "FS.Link",
.op = afs_FS_Link,
.deliver = afs_deliver_fs_link,
.destructor = afs_flat_call_destructor,
};
/*
* make a hard link
*/
int afs_fs_link(struct afs_fs_cursor *fc, struct afs_vnode *vnode,
const char *name,
struct afs_status_cb *dvnode_scb,
struct afs_status_cb *vnode_scb)
{
struct afs_vnode *dvnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(vnode);
size_t namesz, reqsz, padsz;
__be32 *bp;
if (test_bit(AFS_SERVER_FL_IS_YFS, &fc->cbi->server->flags))
return yfs_fs_link(fc, vnode, name, dvnode_scb, vnode_scb);
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz + (3 * 4);
call = afs_alloc_flat_call(net, &afs_RXFSLink, reqsz, (21 + 21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = fc->key;
call->out_dir_scb = dvnode_scb;
call->out_scb = vnode_scb;
/* 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);
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call1(call, &vnode->fid, name);
afs_set_fc_call(call, fc);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* deliver reply data to an FS.Symlink
*/
static int afs_deliver_fs_symlink(struct afs_call *call)
{
const __be32 *bp;
int ret;
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->out_fid);
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
if (ret < 0)
return ret;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
if (ret < 0)
return ret;
xdr_decode_AFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
}
/*
* FS.Symlink operation type
*/
static const struct afs_call_type afs_RXFSSymlink = {
.name = "FS.Symlink",
.op = afs_FS_Symlink,
.deliver = afs_deliver_fs_symlink,
.destructor = afs_flat_call_destructor,
};
/*
* create a symbolic link
*/
int afs_fs_symlink(struct afs_fs_cursor *fc,
const char *name,
const char *contents,
struct afs_status_cb *dvnode_scb,
struct afs_fid *newfid,
struct afs_status_cb *new_scb)
{
struct afs_vnode *dvnode = fc->vnode;
struct afs_call *call;
struct afs_net *net = afs_v2net(dvnode);
size_t namesz, reqsz, padsz, c_namesz, c_padsz;
__be32 *bp;
if (test_bit(AFS_SERVER_FL_IS_YFS, &fc->cbi->server->flags))
return yfs_fs_symlink(fc, name, contents, dvnode_scb,
newfid, new_scb);
_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(net, &afs_RXFSSymlink, reqsz,
(3 + 21 + 21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = fc->key;
call->out_dir_scb = dvnode_scb;
call->out_fid = newfid;
call->out_scb = new_scb;
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSSYMLINK);
*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(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 | AFS_SET_MTIME);
*bp++ = htonl(dvnode->vfs_inode.i_mtime.tv_sec); /* mtime */
*bp++ = 0; /* owner */
*bp++ = 0; /* group */
*bp++ = htonl(S_IRWXUGO); /* unix mode */
*bp++ = 0; /* segment size */
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call1(call, &dvnode->fid, name);
afs_set_fc_call(call, fc);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}
/*
* deliver reply data to an FS.Rename
*/
static int afs_deliver_fs_rename(struct afs_call *call)
{
const __be32 *bp;
int ret;
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
if (ret < 0)
return ret;
if (call->out_dir_scb != call->out_scb) {
ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
if (ret < 0)
return ret;
}
xdr_decode_AFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
}
/*