/*
* Send the callback reply
*/
int bc_send(struct rpc_rqst *req)
{
struct rpc_task *task;
int ret;
dprintk("RPC: bc_send req= %p\n", req);
task = rpc_run_bc_task(req, &nfs41_callback_ops);
if (IS_ERR(task))
ret = PTR_ERR(task);
else {
BUG_ON(atomic_read(&task->tk_count) != 1);
ret = task->tk_status;
rpc_put_task(task);
}
<<<<<<< HEAD
/*
* Process a backchannel RPC request that arrived over an existing
* outbound connection
*/
int
bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
struct svc_rqst *rqstp)
{
struct kvec *argv = &rqstp->rq_arg.head[0];
struct kvec *resv = &rqstp->rq_res.head[0];
struct rpc_task *task;
int proc_error;
int error;
dprintk("svc: %s(%p)\n", __func__, req);
/* Build the svc_rqst used by the common processing routine */
rqstp->rq_xprt = serv->sv_bc_xprt;
rqstp->rq_xid = req->rq_xid;
rqstp->rq_prot = req->rq_xprt->prot;
rqstp->rq_server = serv;
rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
/* Adjust the argument buffer length */
rqstp->rq_arg.len = req->rq_private_buf.len;
if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
rqstp->rq_arg.page_len = 0;
} else if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len +
rqstp->rq_arg.page_len)
rqstp->rq_arg.page_len = rqstp->rq_arg.len -
rqstp->rq_arg.head[0].iov_len;
else
rqstp->rq_arg.len = rqstp->rq_arg.head[0].iov_len +
rqstp->rq_arg.page_len;
/* reset result send buffer "put" position */
resv->iov_len = 0;
/*
* Skip the next two words because they've already been
* processed in the transport
*/
svc_getu32(argv); /* XID */
svc_getnl(argv); /* CALLDIR */
/* Parse and execute the bc call */
proc_error = svc_process_common(rqstp, argv, resv);
atomic_inc(&req->rq_xprt->bc_free_slots);
if (!proc_error) {
/* Processing error: drop the request */
xprt_free_bc_request(req);
return 0;
}
/* Finally, send the reply synchronously */
memcpy(&req->rq_snd_buf, &rqstp->rq_res, sizeof(req->rq_snd_buf));
task = rpc_run_bc_task(req);
if (IS_ERR(task)) {
error = PTR_ERR(task);
goto out;
}
WARN_ON_ONCE(atomic_read(&task->tk_count) != 1);
error = task->tk_status;
rpc_put_task(task);
out:
dprintk("svc: %s(), error=%d\n", __func__, error);
return error;
}
/**
* nfs_sillyrename - Perform a silly-rename of a dentry
* @dir: inode of directory that contains dentry
* @dentry: dentry to be sillyrenamed
*
* NFSv2/3 is stateless and the server doesn't know when the client is
* holding a file open. To prevent application problems when a file is
* unlinked while it's still open, the client performs a "silly-rename".
* That is, it renames the file to a hidden file in the same directory,
* and only performs the unlink once the last reference to it is put.
*
* The final cleanup is done during dentry_iput.
*
* (Note: NFSv4 is stateful, and has opens, so in theory an NFSv4 server
* could take responsibility for keeping open files referenced. The server
* would also need to ensure that opened-but-deleted files were kept over
* reboots. However, we may not assume a server does so. (RFC 5661
* does provide an OPEN4_RESULT_PRESERVE_UNLINKED flag that a server can
* use to advertise that it does this; some day we may take advantage of
* it.))
*/
int
nfs_sillyrename(struct inode *dir, struct dentry *dentry)
{
static unsigned int sillycounter;
const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2;
const int countersize = sizeof(sillycounter)*2;
const int slen = sizeof(".nfs")+fileidsize+countersize-1;
char silly[slen+1];
struct dentry *sdentry;
struct rpc_task *task;
int error = -EIO;
dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
dentry->d_count);
nfs_inc_stats(dir, NFSIOS_SILLYRENAME);
/*
* We don't allow a dentry to be silly-renamed twice.
*/
error = -EBUSY;
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto out;
sprintf(silly, ".nfs%*.*Lx",
fileidsize, fileidsize,
(unsigned long long)NFS_FILEID(dentry->d_inode));
/* Return delegation in anticipation of the rename */
NFS_PROTO(dentry->d_inode)->return_delegation(dentry->d_inode);
sdentry = NULL;
do {
char *suffix = silly + slen - countersize;
dput(sdentry);
sillycounter++;
sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);
dfprintk(VFS, "NFS: trying to rename %s to %s\n",
dentry->d_name.name, silly);
sdentry = lookup_one_len(silly, dentry->d_parent, slen);
/*
* N.B. Better to return EBUSY here ... it could be
* dangerous to delete the file while it's in use.
*/
if (IS_ERR(sdentry))
goto out;
} while (sdentry->d_inode != NULL); /* need negative lookup */
/* queue unlink first. Can't do this from rpc_release as it
* has to allocate memory
*/
error = nfs_async_unlink(dir, dentry);
if (error)
goto out_dput;
/* populate unlinkdata with the right dname */
error = nfs_copy_dname(sdentry,
(struct nfs_unlinkdata *)dentry->d_fsdata);
if (error) {
nfs_cancel_async_unlink(dentry);
goto out_dput;
}
/* run the rename task, undo unlink if it fails */
task = nfs_async_rename(dir, dir, dentry, sdentry);
if (IS_ERR(task)) {
error = -EBUSY;
nfs_cancel_async_unlink(dentry);
goto out_dput;
}
/* wait for the RPC task to complete, unless a SIGKILL intervenes */
error = rpc_wait_for_completion_task(task);
if (error == 0)
error = task->tk_status;
switch (error) {
case 0:
/* The rename succeeded */
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
d_move(dentry, sdentry);
break;
case -ERESTARTSYS:
/* The result of the rename is unknown. Play it safe by
* forcing a new lookup */
d_drop(dentry);
d_drop(sdentry);
}
rpc_put_task(task);
out_dput:
dput(sdentry);
out:
return error;
}
/**
* rpcb_register - set or unset a port registration with the local rpcbind svc
* @prog: RPC program number to bind
* @vers: RPC version number to bind
* @prot: transport protocol to use to make this request
* @port: port value to register
* @okay: result code
*
* port == 0 means unregister, port != 0 means register.
*
* This routine supports only rpcbind version 2.
*/
int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
};
struct rpcbind_args map = {
.r_prog = prog,
.r_vers = vers,
.r_prot = prot,
.r_port = port,
};
struct rpc_message msg = {
.rpc_proc = &rpcb_procedures2[port ?
RPCBPROC_SET : RPCBPROC_UNSET],
.rpc_argp = &map,
.rpc_resp = okay,
};
struct rpc_clnt *rpcb_clnt;
int error = 0;
dprintk("RPC: %sregistering (%u, %u, %d, %u) with local "
"rpcbind\n", (port ? "" : "un"),
prog, vers, prot, port);
rpcb_clnt = rpcb_create("localhost", (struct sockaddr *) &sin,
sizeof(sin), XPRT_TRANSPORT_UDP, 2, 1);
if (IS_ERR(rpcb_clnt))
return PTR_ERR(rpcb_clnt);
error = rpc_call_sync(rpcb_clnt, &msg, 0);
rpc_shutdown_client(rpcb_clnt);
if (error < 0)
printk(KERN_WARNING "RPC: failed to contact local rpcbind "
"server (errno %d).\n", -error);
dprintk("RPC: registration status %d/%d\n", error, *okay);
return error;
}
/**
* rpcb_getport_sync - obtain the port for an RPC service on a given host
* @sin: address of remote peer
* @prog: RPC program number to bind
* @vers: RPC version number to bind
* @prot: transport protocol to use to make this request
*
* Return value is the requested advertised port number,
* or a negative errno value.
*
* Called from outside the RPC client in a synchronous task context.
* Uses default timeout parameters specified by underlying transport.
*
* XXX: Needs to support IPv6
*/
int rpcb_getport_sync(struct sockaddr_in *sin, u32 prog, u32 vers, int prot)
{
struct rpcbind_args map = {
.r_prog = prog,
.r_vers = vers,
.r_prot = prot,
.r_port = 0,
};
struct rpc_message msg = {
.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
.rpc_argp = &map,
.rpc_resp = &map.r_port,
};
struct rpc_clnt *rpcb_clnt;
int status;
dprintk("RPC: %s(" NIPQUAD_FMT ", %u, %u, %d)\n",
__FUNCTION__, NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
rpcb_clnt = rpcb_create(NULL, (struct sockaddr *)sin,
sizeof(*sin), prot, 2, 0);
if (IS_ERR(rpcb_clnt))
return PTR_ERR(rpcb_clnt);
status = rpc_call_sync(rpcb_clnt, &msg, 0);
rpc_shutdown_client(rpcb_clnt);
if (status >= 0) {
if (map.r_port != 0)
return map.r_port;
status = -EACCES;
}
return status;
}
EXPORT_SYMBOL_GPL(rpcb_getport_sync);
static struct rpc_task *rpcb_call_async(struct rpc_clnt *rpcb_clnt, struct rpcbind_args *map, int version)
{
struct rpc_message msg = {
.rpc_proc = rpcb_next_version[version].rpc_proc,
.rpc_argp = map,
.rpc_resp = &map->r_port,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = rpcb_clnt,
.rpc_message = &msg,
.callback_ops = &rpcb_getport_ops,
.callback_data = map,
.flags = RPC_TASK_ASYNC,
};
return rpc_run_task(&task_setup_data);
}
/**
* rpcb_getport_async - obtain the port for a given RPC service on a given host
* @task: task that is waiting for portmapper request
*
* This one can be called for an ongoing RPC request, and can be used in
* an async (rpciod) context.
*/
void rpcb_getport_async(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
u32 bind_version;
struct rpc_xprt *xprt = task->tk_xprt;
struct rpc_clnt *rpcb_clnt;
static struct rpcbind_args *map;
struct rpc_task *child;
struct sockaddr_storage addr;
struct sockaddr *sap = (struct sockaddr *)&addr;
size_t salen;
int status;
struct rpcb_info *info;
dprintk("RPC: %5u %s(%s, %u, %u, %d)\n",
task->tk_pid, __FUNCTION__,
clnt->cl_server, clnt->cl_prog, clnt->cl_vers, xprt->prot);
/* Autobind on cloned rpc clients is discouraged */
BUG_ON(clnt->cl_parent != clnt);
if (xprt_test_and_set_binding(xprt)) {
status = -EAGAIN; /* tell caller to check again */
dprintk("RPC: %5u %s: waiting for another binder\n",
task->tk_pid, __FUNCTION__);
goto bailout_nowake;
}
/* Put self on queue before sending rpcbind request, in case
* rpcb_getport_done completes before we return from rpc_run_task */
rpc_sleep_on(&xprt->binding, task, NULL, NULL);
/* Someone else may have bound if we slept */
if (xprt_bound(xprt)) {
status = 0;
dprintk("RPC: %5u %s: already bound\n",
task->tk_pid, __FUNCTION__);
goto bailout_nofree;
}
salen = rpc_peeraddr(clnt, sap, sizeof(addr));
/* Don't ever use rpcbind v2 for AF_INET6 requests */
switch (sap->sa_family) {
case AF_INET:
info = rpcb_next_version;
break;
case AF_INET6:
info = rpcb_next_version6;
break;
default:
status = -EAFNOSUPPORT;
dprintk("RPC: %5u %s: bad address family\n",
task->tk_pid, __FUNCTION__);
goto bailout_nofree;
}
if (info[xprt->bind_index].rpc_proc == NULL) {
xprt->bind_index = 0;
status = -EPFNOSUPPORT;
dprintk("RPC: %5u %s: no more getport versions available\n",
task->tk_pid, __FUNCTION__);
goto bailout_nofree;
}
bind_version = info[xprt->bind_index].rpc_vers;
dprintk("RPC: %5u %s: trying rpcbind version %u\n",
task->tk_pid, __FUNCTION__, bind_version);
rpcb_clnt = rpcb_create(clnt->cl_server, sap, salen, xprt->prot,
bind_version, 0);
if (IS_ERR(rpcb_clnt)) {
status = PTR_ERR(rpcb_clnt);
dprintk("RPC: %5u %s: rpcb_create failed, error %ld\n",
task->tk_pid, __FUNCTION__, PTR_ERR(rpcb_clnt));
goto bailout_nofree;
}
map = kzalloc(sizeof(struct rpcbind_args), GFP_ATOMIC);
if (!map) {
status = -ENOMEM;
dprintk("RPC: %5u %s: no memory available\n",
task->tk_pid, __FUNCTION__);
goto bailout_nofree;
}
map->r_prog = clnt->cl_prog;
map->r_vers = clnt->cl_vers;
map->r_prot = xprt->prot;
map->r_port = 0;
map->r_xprt = xprt_get(xprt);
map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR);
map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */
child = rpcb_call_async(rpcb_clnt, map, xprt->bind_index);
rpc_release_client(rpcb_clnt);
if (IS_ERR(child)) {
status = -EIO;
dprintk("RPC: %5u %s: rpc_run_task failed\n",
task->tk_pid, __FUNCTION__);
goto bailout;
}
rpc_put_task(child);
task->tk_xprt->stat.bind_count++;
return;
bailout:
kfree(map);
xprt_put(xprt);
bailout_nofree:
rpcb_wake_rpcbind_waiters(xprt, status);
bailout_nowake:
task->tk_status = status;
}
EXPORT_SYMBOL_GPL(rpcb_getport_async);
/*
* Rpcbind child task calls this callback via tk_exit.
*/
static void rpcb_getport_done(struct rpc_task *child, void *data)
{
struct rpcbind_args *map = data;
struct rpc_xprt *xprt = map->r_xprt;
int status = child->tk_status;
/* Garbage reply: retry with a lesser rpcbind version */
if (status == -EIO)
status = -EPROTONOSUPPORT;
/* rpcbind server doesn't support this rpcbind protocol version */
if (status == -EPROTONOSUPPORT)
xprt->bind_index++;
if (status < 0) {
/* rpcbind server not available on remote host? */
xprt->ops->set_port(xprt, 0);
} else if (map->r_port == 0) {
/* Requested RPC service wasn't registered on remote host */
xprt->ops->set_port(xprt, 0);
status = -EACCES;
} else {
/* Succeeded */
xprt->ops->set_port(xprt, map->r_port);
xprt_set_bound(xprt);
status = 0;
}
dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
child->tk_pid, status, map->r_port);
rpcb_wake_rpcbind_waiters(xprt, status);
}
static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,
struct rpcbind_args *rpcb)
{
dprintk("RPC: rpcb_encode_mapping(%u, %u, %d, %u)\n",
rpcb->r_prog, rpcb->r_vers, rpcb->r_prot, rpcb->r_port);
*p++ = htonl(rpcb->r_prog);
*p++ = htonl(rpcb->r_vers);
*p++ = htonl(rpcb->r_prot);
*p++ = htonl(rpcb->r_port);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int rpcb_decode_getport(struct rpc_rqst *req, __be32 *p,
unsigned short *portp)
{
*portp = (unsigned short) ntohl(*p++);
dprintk("RPC: rpcb_decode_getport result %u\n",
*portp);
return 0;
}
static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
unsigned int *boolp)
{
*boolp = (unsigned int) ntohl(*p++);
dprintk("RPC: rpcb_decode_set result %u\n",
*boolp);
return 0;
}
static int rpcb_encode_getaddr(struct rpc_rqst *req, __be32 *p,
struct rpcbind_args *rpcb)
{
dprintk("RPC: rpcb_encode_getaddr(%u, %u, %s)\n",
rpcb->r_prog, rpcb->r_vers, rpcb->r_addr);
*p++ = htonl(rpcb->r_prog);
*p++ = htonl(rpcb->r_vers);
p = xdr_encode_string(p, rpcb->r_netid);
p = xdr_encode_string(p, rpcb->r_addr);
p = xdr_encode_string(p, rpcb->r_owner);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
/*
* Set up the argument/result storage required for the RPC call.
*/
static int nfs_commit_rpcsetup(struct list_head *head,
struct nfs_write_data *data,
int how)
{
struct nfs_page *first = nfs_list_entry(head->next);
struct inode *inode = first->wb_context->path.dentry->d_inode;
int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
int priority = flush_task_priority(how);
struct rpc_task *task;
struct rpc_message msg = {
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = first->wb_context->cred,
};
struct rpc_task_setup task_setup_data = {
.task = &data->task,
.rpc_client = NFS_CLIENT(inode),
.rpc_message = &msg,
.callback_ops = &nfs_commit_ops,
.callback_data = data,
.workqueue = nfsiod_workqueue,
.flags = flags,
.priority = priority,
};
/* Set up the RPC argument and reply structs
* NB: take care not to mess about with data->commit et al. */
list_splice_init(head, &data->pages);
data->inode = inode;
data->cred = msg.rpc_cred;
data->args.fh = NFS_FH(data->inode);
/* Note: we always request a commit of the entire inode */
data->args.offset = 0;
data->args.count = 0;
data->args.context = get_nfs_open_context(first->wb_context);
data->res.count = 0;
data->res.fattr = &data->fattr;
data->res.verf = &data->verf;
nfs_fattr_init(&data->fattr);
/* Set up the initial task struct. */
NFS_PROTO(inode)->commit_setup(data, &msg);
dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
rpc_put_task(task);
return 0;
}
/*
* Commit dirty pages
*/
static int
nfs_commit_list(struct inode *inode, struct list_head *head, int how)
{
struct nfs_write_data *data;
struct nfs_page *req;
data = nfs_commitdata_alloc();
if (!data)
goto out_bad;
/* Set up the argument struct */
return nfs_commit_rpcsetup(head, data, how);
out_bad:
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
nfs_mark_request_commit(req);
dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
BDI_RECLAIMABLE);
nfs_clear_page_tag_locked(req);
}
return -ENOMEM;
}
/*
* COMMIT call returned
*/
static void nfs_commit_done(struct rpc_task *task, void *calldata)
{
struct nfs_write_data *data = calldata;
dprintk("NFS: %5u nfs_commit_done (status %d)\n",
task->tk_pid, task->tk_status);
/* Call the NFS version-specific code */
if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
return;
}
static void nfs_commit_release(void *calldata)
{
struct nfs_write_data *data = calldata;
struct nfs_page *req;
int status = data->task.tk_status;
while (!list_empty(&data->pages)) {
req = nfs_list_entry(data->pages.next);
nfs_list_remove_request(req);
nfs_clear_request_commit(req);
dprintk("NFS: commit (%s/%lld %d@%lld)",
req->wb_context->path.dentry->d_inode->i_sb->s_id,
(long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
req->wb_bytes,
(long long)req_offset(req));
if (status < 0) {
nfs_context_set_write_error(req->wb_context, status);
nfs_inode_remove_request(req);
dprintk(", error = %d\n", status);
goto next;
}
/* Okay, COMMIT succeeded, apparently. Check the verifier
* returned by the server against all stored verfs. */
if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
/* We have a match */
nfs_inode_remove_request(req);
dprintk(" OK\n");
goto next;
}
/* We have a mismatch. Write the page again */
dprintk(" mismatch\n");
nfs_mark_request_dirty(req);
next:
nfs_clear_page_tag_locked(req);
}
nfs_commitdata_release(calldata);
}
static const struct rpc_call_ops nfs_commit_ops = {
#if defined(CONFIG_NFS_V4_1)
.rpc_call_prepare = nfs_write_prepare,
#endif /* CONFIG_NFS_V4_1 */
.rpc_call_done = nfs_commit_done,
.rpc_release = nfs_commit_release,
};
int nfs_commit_inode(struct inode *inode, int how)
{
LIST_HEAD(head);
int res;
spin_lock(&inode->i_lock);
res = nfs_scan_commit(inode, &head, 0, 0);
spin_unlock(&inode->i_lock);
if (res) {
int error = nfs_commit_list(inode, &head, how);
if (error < 0)
return error;
}
return res;
}
#else
static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
{
return 0;
}
#endif
long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
{
struct inode *inode = mapping->host;
pgoff_t idx_start, idx_end;
unsigned int npages = 0;
LIST_HEAD(head);
int nocommit = how & FLUSH_NOCOMMIT;
long pages, ret;
/* FIXME */
if (wbc->range_cyclic)
idx_start = 0;
else {
idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
if (idx_end > idx_start) {
pgoff_t l_npages = 1 + idx_end - idx_start;
npages = l_npages;
if (sizeof(npages) != sizeof(l_npages) &&
(pgoff_t)npages != l_npages)
npages = 0;
}
}
how &= ~FLUSH_NOCOMMIT;
spin_lock(&inode->i_lock);
do {
ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
if (ret != 0)
continue;
if (nocommit)
break;
pages = nfs_scan_commit(inode, &head, idx_start, npages);
if (pages == 0)
break;
if (how & FLUSH_INVALIDATE) {
spin_unlock(&inode->i_lock);
nfs_cancel_commit_list(&head);
ret = pages;
spin_lock(&inode->i_lock);
continue;
}
pages += nfs_scan_commit(inode, &head, 0, 0);
spin_unlock(&inode->i_lock);
ret = nfs_commit_list(inode, &head, how);
spin_lock(&inode->i_lock);
} while (ret >= 0);
spin_unlock(&inode->i_lock);
return ret;
}
static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
{
int ret;
ret = nfs_writepages(mapping, wbc);
if (ret < 0)
goto out;
ret = nfs_sync_mapping_wait(mapping, wbc, how);
if (ret < 0)
goto out;
return 0;
out:
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
return ret;
}
/*
* Set up the argument/result storage required for the RPC call.
*/
static int nfs_write_rpcsetup(struct nfs_page *req,
struct nfs_write_data *data,
const struct rpc_call_ops *call_ops,
unsigned int count, unsigned int offset,
int how)
{
struct inode *inode = req->wb_context->path.dentry->d_inode;
int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
int priority = flush_task_priority(how);
struct rpc_task *task;
struct rpc_message msg = {
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = req->wb_context->cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = NFS_CLIENT(inode),
.task = &data->task,
.rpc_message = &msg,
.callback_ops = call_ops,
.callback_data = data,
.workqueue = nfsiod_workqueue,
.flags = flags,
.priority = priority,
};
/* Set up the RPC argument and reply structs
* NB: take care not to mess about with data->commit et al. */
data->req = req;
data->inode = inode = req->wb_context->path.dentry->d_inode;
data->cred = msg.rpc_cred;
data->args.fh = NFS_FH(inode);
data->args.offset = req_offset(req) + offset;
data->args.pgbase = req->wb_pgbase + offset;
data->args.pages = data->pagevec;
data->args.count = count;
data->args.context = get_nfs_open_context(req->wb_context);
data->args.stable = NFS_UNSTABLE;
if (how & FLUSH_STABLE) {
data->args.stable = NFS_DATA_SYNC;
if (!nfs_need_commit(NFS_I(inode)))
data->args.stable = NFS_FILE_SYNC;
}
data->res.fattr = &data->fattr;
data->res.count = count;
data->res.verf = &data->verf;
nfs_fattr_init(&data->fattr);
/* Set up the initial task struct. */
NFS_PROTO(inode)->write_setup(data, &msg);
dprintk("NFS: %5u initiated write call "
"(req %s/%lld, %u bytes @ offset %llu)\n",
data->task.tk_pid,
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
count,
(unsigned long long)data->args.offset);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
rpc_put_task(task);
return 0;
}
/* If a nfs_flush_* function fails, it should remove reqs from @head and
* call this on each, which will prepare them to be retried on next
* writeback using standard nfs.
*/
static void nfs_redirty_request(struct nfs_page *req)
{
nfs_mark_request_dirty(req);
nfs_end_page_writeback(req->wb_page);
nfs_clear_page_tag_locked(req);
}
/*
* Generate multiple small requests to write out a single
* contiguous dirty area on one page.
*/
static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
{
struct nfs_page *req = nfs_list_entry(head->next);
struct page *page = req->wb_page;
struct nfs_write_data *data;
size_t wsize = NFS_SERVER(inode)->wsize, nbytes;
unsigned int offset;
int requests = 0;
int ret = 0;
LIST_HEAD(list);
nfs_list_remove_request(req);
nbytes = count;
do {
size_t len = min(nbytes, wsize);
data = nfs_writedata_alloc(1);
if (!data)
goto out_bad;
list_add(&data->pages, &list);
requests++;
nbytes -= len;
} while (nbytes != 0);
atomic_set(&req->wb_complete, requests);
ClearPageError(page);
offset = 0;
nbytes = count;
do {
int ret2;
data = list_entry(list.next, struct nfs_write_data, pages);
list_del_init(&data->pages);
data->pagevec[0] = page;
if (nbytes < wsize)
wsize = nbytes;
ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
wsize, offset, how);
if (ret == 0)
ret = ret2;
offset += wsize;
nbytes -= wsize;
} while (nbytes != 0);
return ret;
out_bad:
while (!list_empty(&list)) {
data = list_entry(list.next, struct nfs_write_data, pages);
list_del(&data->pages);
nfs_writedata_release(data);
}
nfs_redirty_request(req);
return -ENOMEM;
}
/*
* Create an RPC task for the given write request and kick it.
* The page must have been locked by the caller.
*
* It may happen that the page we're passed is not marked dirty.
* This is the case if nfs_updatepage detects a conflicting request
* that has been written but not committed.
*/
static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
{
struct nfs_page *req;
struct page **pages;
struct nfs_write_data *data;
data = nfs_writedata_alloc(npages);
if (!data)
goto out_bad;
pages = data->pagevec;
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
nfs_list_add_request(req, &data->pages);
ClearPageError(req->wb_page);
*pages++ = req->wb_page;
}
req = nfs_list_entry(data->pages.next);
/* Set up the argument struct */
return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how);
out_bad:
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);
nfs_redirty_request(req);
}
return -ENOMEM;
}
static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
struct inode *inode, int ioflags)
{
size_t wsize = NFS_SERVER(inode)->wsize;
if (wsize < PAGE_CACHE_SIZE)
nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags);
else
nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags);
}
static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data)
{
struct rpc_message msg = {
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = data->cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_message = &msg,
.callback_ops = &nfs_unlink_ops,
.callback_data = data,
.flags = RPC_TASK_ASYNC,
};
struct rpc_task *task;
struct dentry *alias;
alias = d_lookup(parent, &data->args.name);
if (alias != NULL) {
int ret = 0;
/*
* Hey, we raced with lookup... See if we need to transfer
* the sillyrename information to the aliased dentry.
*/
nfs_free_dname(data);
spin_lock(&alias->d_lock);
if (alias->d_inode != NULL &&
!(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
alias->d_fsdata = data;
alias->d_flags |= DCACHE_NFSFS_RENAMED;
ret = 1;
}
spin_unlock(&alias->d_lock);
nfs_dec_sillycount(dir);
dput(alias);
return ret;
}
data->dir = igrab(dir);
if (!data->dir) {
nfs_dec_sillycount(dir);
return 0;
}
nfs_sb_active(NFS_SERVER(dir));
data->args.fh = NFS_FH(dir);
nfs_fattr_init(&data->res.dir_attr);
NFS_PROTO(dir)->unlink_setup(&msg, dir);
task_setup_data.rpc_client = NFS_CLIENT(dir);
task = rpc_run_task(&task_setup_data);
if (!IS_ERR(task))
rpc_put_task(task);
return 1;
}
static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
{
struct dentry *parent;
struct inode *dir;
int ret = 0;
parent = dget_parent(dentry);
if (parent == NULL)
goto out_free;
dir = parent->d_inode;
if (nfs_copy_dname(dentry, data) != 0)
goto out_dput;
/* Non-exclusive lock protects against concurrent lookup() calls */
spin_lock(&dir->i_lock);
if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) {
/* Deferred delete */
hlist_add_head(&data->list, &NFS_I(dir)->silly_list);
spin_unlock(&dir->i_lock);
ret = 1;
goto out_dput;
}
spin_unlock(&dir->i_lock);
ret = nfs_do_call_unlink(parent, dir, data);
out_dput:
dput(parent);
out_free:
return ret;
}
void nfs_block_sillyrename(struct dentry *dentry)
{
struct nfs_inode *nfsi = NFS_I(dentry->d_inode);
wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1);
}
void nfs_unblock_sillyrename(struct dentry *dentry)
{
struct inode *dir = dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(dir);
struct nfs_unlinkdata *data;
atomic_inc(&nfsi->silly_count);
spin_lock(&dir->i_lock);
while (!hlist_empty(&nfsi->silly_list)) {
if (!atomic_inc_not_zero(&nfsi->silly_count))
break;
data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list);
hlist_del(&data->list);
spin_unlock(&dir->i_lock);
if (nfs_do_call_unlink(dentry, dir, data) == 0)
nfs_free_unlinkdata(data);
spin_lock(&dir->i_lock);
}
spin_unlock(&dir->i_lock);
}
/**
* nfs_async_unlink - asynchronous unlinking of a file
* @dir: parent directory of dentry
* @dentry: dentry to unlink
*/
int
nfs_async_unlink(struct inode *dir, struct dentry *dentry)
{
struct nfs_unlinkdata *data;
int status = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL)
goto out;
data->cred = rpc_lookup_cred();
if (IS_ERR(data->cred)) {
status = PTR_ERR(data->cred);
goto out_free;
}
status = -EBUSY;
spin_lock(&dentry->d_lock);
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto out_unlock;
dentry->d_flags |= DCACHE_NFSFS_RENAMED;
dentry->d_fsdata = data;
spin_unlock(&dentry->d_lock);
return 0;
out_unlock:
spin_unlock(&dentry->d_lock);
put_rpccred(data->cred);
out_free:
kfree(data);
out:
return status;
}
/**
* nfs_complete_unlink - Initialize completion of the sillydelete
* @dentry: dentry to delete
* @inode: inode
*
* Since we're most likely to be called by dentry_iput(), we
* only use the dentry to find the sillydelete. We then copy the name
* into the qstr.
*/
void
nfs_complete_unlink(struct dentry *dentry, struct inode *inode)
{
struct nfs_unlinkdata *data = NULL;
spin_lock(&dentry->d_lock);
if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
data = dentry->d_fsdata;
}
spin_unlock(&dentry->d_lock);
if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data)))
nfs_free_unlinkdata(data);
}
static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
struct nfs_lock_context *lock, loff_t offset, loff_t len)
{
struct inode *inode = file_inode(filep);
struct nfs_server *server = NFS_SERVER(inode);
struct nfs42_falloc_args args = {
.falloc_fh = NFS_FH(inode),
.falloc_offset = offset,
.falloc_length = len,
.falloc_bitmask = server->cache_consistency_bitmask,
};
struct nfs42_falloc_res res = {
.falloc_server = server,
};
int status;
msg->rpc_argp = &args;
msg->rpc_resp = &res;
status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
lock, FMODE_WRITE);
if (status)
return status;
res.falloc_fattr = nfs_alloc_fattr();
if (!res.falloc_fattr)
return -ENOMEM;
status = nfs4_call_sync(server->client, server, msg,
&args.seq_args, &res.seq_res, 0);
if (status == 0)
status = nfs_post_op_update_inode(inode, res.falloc_fattr);
kfree(res.falloc_fattr);
return status;
}
static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
loff_t offset, loff_t len)
{
struct nfs_server *server = NFS_SERVER(file_inode(filep));
struct nfs4_exception exception = { };
struct nfs_lock_context *lock;
int err;
lock = nfs_get_lock_context(nfs_file_open_context(filep));
if (IS_ERR(lock))
return PTR_ERR(lock);
exception.inode = file_inode(filep);
exception.state = lock->open_context->state;
do {
err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
if (err == -ENOTSUPP) {
err = -EOPNOTSUPP;
break;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
nfs_put_lock_context(lock);
return err;
}
int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
};
struct inode *inode = file_inode(filep);
int err;
if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
return -EOPNOTSUPP;
inode_lock(inode);
err = nfs42_proc_fallocate(&msg, filep, offset, len);
if (err == -EOPNOTSUPP)
NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
inode_unlock(inode);
return err;
}
int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
};
struct inode *inode = file_inode(filep);
int err;
if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
return -EOPNOTSUPP;
inode_lock(inode);
err = nfs_sync_inode(inode);
if (err)
goto out_unlock;
err = nfs42_proc_fallocate(&msg, filep, offset, len);
if (err == 0)
truncate_pagecache_range(inode, offset, (offset + len) -1);
if (err == -EOPNOTSUPP)
NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
out_unlock:
inode_unlock(inode);
return err;
}
static ssize_t _nfs42_proc_copy(struct file *src, loff_t pos_src,
struct nfs_lock_context *src_lock,
struct file *dst, loff_t pos_dst,
struct nfs_lock_context *dst_lock,
size_t count)
{
struct nfs42_copy_args args = {
.src_fh = NFS_FH(file_inode(src)),
.src_pos = pos_src,
.dst_fh = NFS_FH(file_inode(dst)),
.dst_pos = pos_dst,
.count = count,
};
struct nfs42_copy_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
.rpc_argp = &args,
.rpc_resp = &res,
};
struct inode *dst_inode = file_inode(dst);
struct nfs_server *server = NFS_SERVER(dst_inode);
int status;
status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
src_lock, FMODE_READ);
if (status)
return status;
status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
pos_src, pos_src + (loff_t)count - 1);
if (status)
return status;
status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
dst_lock, FMODE_WRITE);
if (status)
return status;
status = nfs_sync_inode(dst_inode);
if (status)
return status;
status = nfs4_call_sync(server->client, server, &msg,
&args.seq_args, &res.seq_res, 0);
if (status == -ENOTSUPP)
server->caps &= ~NFS_CAP_COPY;
if (status)
return status;
if (res.write_res.verifier.committed != NFS_FILE_SYNC) {
status = nfs_commit_file(dst, &res.write_res.verifier.verifier);
if (status)
return status;
}
truncate_pagecache_range(dst_inode, pos_dst,
pos_dst + res.write_res.count);
return res.write_res.count;
}
ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
struct file *dst, loff_t pos_dst,
size_t count)
{
struct nfs_server *server = NFS_SERVER(file_inode(dst));
struct nfs_lock_context *src_lock;
struct nfs_lock_context *dst_lock;
struct nfs4_exception src_exception = { };
struct nfs4_exception dst_exception = { };
ssize_t err, err2;
if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
return -EOPNOTSUPP;
src_lock = nfs_get_lock_context(nfs_file_open_context(src));
if (IS_ERR(src_lock))
return PTR_ERR(src_lock);
src_exception.inode = file_inode(src);
src_exception.state = src_lock->open_context->state;
dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
if (IS_ERR(dst_lock)) {
err = PTR_ERR(dst_lock);
goto out_put_src_lock;
}
dst_exception.inode = file_inode(dst);
dst_exception.state = dst_lock->open_context->state;
do {
inode_lock(file_inode(dst));
err = _nfs42_proc_copy(src, pos_src, src_lock,
dst, pos_dst, dst_lock, count);
inode_unlock(file_inode(dst));
if (err == -ENOTSUPP) {
err = -EOPNOTSUPP;
break;
}
err2 = nfs4_handle_exception(server, err, &src_exception);
err = nfs4_handle_exception(server, err, &dst_exception);
if (!err)
err = err2;
} while (src_exception.retry || dst_exception.retry);
nfs_put_lock_context(dst_lock);
out_put_src_lock:
nfs_put_lock_context(src_lock);
return err;
}
static loff_t _nfs42_proc_llseek(struct file *filep,
struct nfs_lock_context *lock, loff_t offset, int whence)
{
struct inode *inode = file_inode(filep);
struct nfs42_seek_args args = {
.sa_fh = NFS_FH(inode),
.sa_offset = offset,
.sa_what = (whence == SEEK_HOLE) ?
NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
};
struct nfs42_seek_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
.rpc_argp = &args,
.rpc_resp = &res,
};
struct nfs_server *server = NFS_SERVER(inode);
int status;
if (!nfs_server_capable(inode, NFS_CAP_SEEK))
return -ENOTSUPP;
status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
lock, FMODE_READ);
if (status)
return status;
status = nfs_filemap_write_and_wait_range(inode->i_mapping,
offset, LLONG_MAX);
if (status)
return status;
status = nfs4_call_sync(server->client, server, &msg,
&args.seq_args, &res.seq_res, 0);
if (status == -ENOTSUPP)
server->caps &= ~NFS_CAP_SEEK;
if (status)
return status;
return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
}
loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
{
struct nfs_server *server = NFS_SERVER(file_inode(filep));
struct nfs4_exception exception = { };
struct nfs_lock_context *lock;
loff_t err;
lock = nfs_get_lock_context(nfs_file_open_context(filep));
if (IS_ERR(lock))
return PTR_ERR(lock);
exception.inode = file_inode(filep);
exception.state = lock->open_context->state;
do {
err = _nfs42_proc_llseek(filep, lock, offset, whence);
if (err >= 0)
break;
if (err == -ENOTSUPP) {
err = -EOPNOTSUPP;
break;
}
err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
nfs_put_lock_context(lock);
return err;
}
static void
nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
{
struct nfs42_layoutstat_data *data = calldata;
struct inode *inode = data->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct pnfs_layout_hdr *lo;
spin_lock(&inode->i_lock);
lo = NFS_I(inode)->layout;
if (!pnfs_layout_is_valid(lo)) {
spin_unlock(&inode->i_lock);
rpc_exit(task, 0);
return;
}
nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
spin_unlock(&inode->i_lock);
nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
&data->res.seq_res, task);
}
static void
nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
{
struct nfs42_layoutstat_data *data = calldata;
struct inode *inode = data->inode;
struct pnfs_layout_hdr *lo;
if (!nfs4_sequence_done(task, &data->res.seq_res))
return;
switch (task->tk_status) {
case 0:
break;
case -NFS4ERR_EXPIRED:
case -NFS4ERR_ADMIN_REVOKED:
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_BAD_STATEID:
spin_lock(&inode->i_lock);
lo = NFS_I(inode)->layout;
if (pnfs_layout_is_valid(lo) &&
nfs4_stateid_match(&data->args.stateid,
&lo->plh_stateid)) {
LIST_HEAD(head);
/*
* Mark the bad layout state as invalid, then retry
* with the current stateid.
*/
pnfs_mark_layout_stateid_invalid(lo, &head);
spin_unlock(&inode->i_lock);
pnfs_free_lseg_list(&head);
} else
spin_unlock(&inode->i_lock);
break;
case -NFS4ERR_OLD_STATEID:
spin_lock(&inode->i_lock);
lo = NFS_I(inode)->layout;
if (pnfs_layout_is_valid(lo) &&
nfs4_stateid_match_other(&data->args.stateid,
&lo->plh_stateid)) {
/* Do we need to delay before resending? */
if (!nfs4_stateid_is_newer(&lo->plh_stateid,
&data->args.stateid))
rpc_delay(task, HZ);
rpc_restart_call_prepare(task);
}
spin_unlock(&inode->i_lock);
break;
case -ENOTSUPP:
case -EOPNOTSUPP:
NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
}
dprintk("%s server returns %d\n", __func__, task->tk_status);
}
static void
nfs42_layoutstat_release(void *calldata)
{
struct nfs42_layoutstat_data *data = calldata;
struct nfs_server *nfss = NFS_SERVER(data->args.inode);
if (nfss->pnfs_curr_ld->cleanup_layoutstats)
nfss->pnfs_curr_ld->cleanup_layoutstats(data);
pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
smp_mb__before_atomic();
clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
smp_mb__after_atomic();
nfs_iput_and_deactive(data->inode);
kfree(data->args.devinfo);
kfree(data);
}
static const struct rpc_call_ops nfs42_layoutstat_ops = {
.rpc_call_prepare = nfs42_layoutstat_prepare,
.rpc_call_done = nfs42_layoutstat_done,
.rpc_release = nfs42_layoutstat_release,
};
int nfs42_proc_layoutstats_generic(struct nfs_server *server,
struct nfs42_layoutstat_data *data)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
.rpc_argp = &data->args,
.rpc_resp = &data->res,
};
struct rpc_task_setup task_setup = {
.rpc_client = server->client,
.rpc_message = &msg,
.callback_ops = &nfs42_layoutstat_ops,
.callback_data = data,
.flags = RPC_TASK_ASYNC,
};
struct rpc_task *task;
data->inode = nfs_igrab_and_active(data->args.inode);
if (!data->inode) {
nfs42_layoutstat_release(data);
return -EAGAIN;
}
nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
task = rpc_run_task(&task_setup);
if (IS_ERR(task))
return PTR_ERR(task);
rpc_put_task(task);
return 0;
}
static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
struct file *dst_f, struct nfs_lock_context *src_lock,
struct nfs_lock_context *dst_lock, loff_t src_offset,
loff_t dst_offset, loff_t count)
{
struct inode *src_inode = file_inode(src_f);
struct inode *dst_inode = file_inode(dst_f);
struct nfs_server *server = NFS_SERVER(dst_inode);
struct nfs42_clone_args args = {
.src_fh = NFS_FH(src_inode),
.dst_fh = NFS_FH(dst_inode),
.src_offset = src_offset,
.dst_offset = dst_offset,
.count = count,
.dst_bitmask = server->cache_consistency_bitmask,
};
struct nfs42_clone_res res = {
.server = server,
};
int status;
msg->rpc_argp = &args;
msg->rpc_resp = &res;
status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
src_lock, FMODE_READ);
if (status)
return status;
status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
dst_lock, FMODE_WRITE);
if (status)
return status;
res.dst_fattr = nfs_alloc_fattr();
if (!res.dst_fattr)
return -ENOMEM;
status = nfs4_call_sync(server->client, server, msg,
&args.seq_args, &res.seq_res, 0);
if (status == 0)
status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
kfree(res.dst_fattr);
return status;
}
int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
loff_t src_offset, loff_t dst_offset, loff_t count)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
};
struct inode *inode = file_inode(src_f);
struct nfs_server *server = NFS_SERVER(file_inode(src_f));
struct nfs_lock_context *src_lock;
struct nfs_lock_context *dst_lock;
struct nfs4_exception src_exception = { };
struct nfs4_exception dst_exception = { };
int err, err2;
if (!nfs_server_capable(inode, NFS_CAP_CLONE))
return -EOPNOTSUPP;
src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
if (IS_ERR(src_lock))
return PTR_ERR(src_lock);
src_exception.inode = file_inode(src_f);
src_exception.state = src_lock->open_context->state;
dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
if (IS_ERR(dst_lock)) {
err = PTR_ERR(dst_lock);
goto out_put_src_lock;
}
dst_exception.inode = file_inode(dst_f);
dst_exception.state = dst_lock->open_context->state;
do {
err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
src_offset, dst_offset, count);
if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
err = -EOPNOTSUPP;
break;
}
err2 = nfs4_handle_exception(server, err, &src_exception);
err = nfs4_handle_exception(server, err, &dst_exception);
if (!err)
err = err2;
} while (src_exception.retry || dst_exception.retry);
nfs_put_lock_context(dst_lock);
out_put_src_lock:
nfs_put_lock_context(src_lock);
return err;
}
int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
const struct rpc_call_ops *call_ops, int how, int flags)
{
struct rpc_task *task;
struct rpc_message msg = {
.rpc_argp = &hdr->args,
.rpc_resp = &hdr->res,
.rpc_cred = hdr->cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = clnt,
.task = &hdr->task,
.rpc_message = &msg,
.callback_ops = call_ops,
.callback_data = hdr,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC | flags,
};
int ret = 0;
hdr->rw_ops->rw_initiate(hdr, &msg, &task_setup_data, how);
dprintk("NFS: %5u initiated pgio call "
"(req %s/%llu, %u bytes @ offset %llu)\n",
hdr->task.tk_pid,
hdr->inode->i_sb->s_id,
(unsigned long long)NFS_FILEID(hdr->inode),
hdr->args.count,
(unsigned long long)hdr->args.offset);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task)) {
ret = PTR_ERR(task);
goto out;
}
if (how & FLUSH_SYNC) {
ret = rpc_wait_for_completion_task(task);
if (ret == 0)
ret = task->tk_status;
}
rpc_put_task(task);
out:
return ret;
}
EXPORT_SYMBOL_GPL(nfs_initiate_pgio);
/**
* nfs_pgio_error - Clean up from a pageio error
* @desc: IO descriptor
* @hdr: pageio header
*/
static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
set_bit(NFS_IOHDR_REDO, &hdr->flags);
nfs_pgio_data_destroy(hdr);
hdr->completion_ops->completion(hdr);
desc->pg_completion_ops->error_cleanup(&desc->pg_list);
return -ENOMEM;
}
/**
* nfs_pgio_release - Release pageio data
* @calldata: The pageio header to release
*/
static void nfs_pgio_release(void *calldata)
{
struct nfs_pgio_header *hdr = calldata;
if (hdr->rw_ops->rw_release)
hdr->rw_ops->rw_release(hdr);
nfs_pgio_data_destroy(hdr);
hdr->completion_ops->completion(hdr);
}
/**
* nfs_pageio_init - initialise a page io descriptor
* @desc: pointer to descriptor
* @inode: pointer to inode
* @doio: pointer to io function
* @bsize: io block size
* @io_flags: extra parameters for the io function
*/
void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
struct inode *inode,
const struct nfs_pageio_ops *pg_ops,
const struct nfs_pgio_completion_ops *compl_ops,
const struct nfs_rw_ops *rw_ops,
size_t bsize,
int io_flags)
{
INIT_LIST_HEAD(&desc->pg_list);
desc->pg_bytes_written = 0;
desc->pg_count = 0;
desc->pg_bsize = bsize;
desc->pg_base = 0;
desc->pg_moreio = 0;
desc->pg_recoalesce = 0;
desc->pg_inode = inode;
desc->pg_ops = pg_ops;
desc->pg_completion_ops = compl_ops;
desc->pg_rw_ops = rw_ops;
desc->pg_ioflags = io_flags;
desc->pg_error = 0;
desc->pg_lseg = NULL;
desc->pg_dreq = NULL;
desc->pg_layout_private = NULL;
}
static int
rbio_submit(struct ploop_io * io, struct nfs_read_data * nreq,
const struct rpc_call_ops * cb)
{
struct nfs_open_context *ctx = nfs_file_open_context(io->files.file);
struct inode *inode = io->files.inode;
struct rpc_task *task;
struct rpc_message msg = {
.rpc_cred = ctx->cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = NFS_CLIENT(inode),
.rpc_message = &msg,
.callback_ops = cb,
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
.workqueue = nfsio_workqueue,
#endif
.flags = RPC_TASK_ASYNC,
};
nreq->res.count = nreq->args.count;
nreq->header->cred = msg.rpc_cred;
nreq->args.context = ctx;
task_setup_data.task = &nreq->task;
task_setup_data.callback_data = nreq;
msg.rpc_argp = &nreq->args;
msg.rpc_resp = &nreq->res;
NFS_PROTO(inode)->read_setup(nreq, &msg);
task = rpc_run_task(&task_setup_data);
if (unlikely(IS_ERR(task)))
return PTR_ERR(task);
rpc_put_task(task);
return 0;
}
#else
static int
rbio_submit(struct ploop_io * io, struct nfs_read_data * nreq,
const struct rpc_call_ops * cb)
{
struct nfs_open_context *ctx = nfs_file_open_context(io->files.file);
struct inode *inode = io->files.inode;
nreq->res.count = nreq->args.count;
nreq->cred = ctx->cred;
nreq->args.context = ctx;
rpc_init_task(&nreq->task, NFS_CLIENT(inode), RPC_TASK_ASYNC, cb, nreq);
NFS_PROTO(inode)->read_setup(nreq);
nreq->task.tk_cookie = (unsigned long) inode;
lock_kernel();
rpc_execute(&nreq->task);
unlock_kernel();
return 0;
}
#endif
static void
nfsio_submit_read(struct ploop_io *io, struct ploop_request * preq,
struct bio_list *sbl, iblock_t iblk, unsigned int size)
{
struct inode *inode = io->files.inode;
size_t rsize = NFS_SERVER(inode)->rsize;
struct nfs_read_data *nreq = NULL;
loff_t pos;
unsigned int prev_end;
struct bio * b;
ploop_prepare_io_request(preq);
pos = sbl->head->bi_sector;
pos = ((loff_t)iblk << preq->plo->cluster_log) | (pos & ((1<<preq->plo->cluster_log) - 1));
pos <<= 9;
prev_end = PAGE_SIZE;
for (b = sbl->head; b != NULL; b = b->bi_next) {
int bv_idx;
for (bv_idx = 0; bv_idx < b->bi_vcnt; bv_idx++) {
struct bio_vec * bv = &b->bi_io_vec[bv_idx];
if (nreq && nreq->args.count + bv->bv_len <= rsize) {
if (nreq->pages.pagevec[nreq->pages.npages-1] == bv->bv_page &&
prev_end == bv->bv_offset) {
nreq->args.count += bv->bv_len;
pos += bv->bv_len;
prev_end += bv->bv_len;
continue;
}
if (nreq->pages.npages < MAX_NBIO_PAGES &&
bv->bv_offset == 0 && prev_end == PAGE_SIZE) {
nreq->args.count += bv->bv_len;
nreq->pages.pagevec[nreq->pages.npages] = bv->bv_page;
nreq->pages.npages++;
pos += bv->bv_len;
prev_end = bv->bv_offset + bv->bv_len;
continue;
}
}
if (nreq) {
int err;
atomic_inc(&preq->io_count);
err = rbio_submit(io, nreq, &nfsio_read_ops);
if (err) {
PLOOP_REQ_SET_ERROR(preq, err);
ploop_complete_io_request(preq);
goto out;
}
}
nreq = rbio_init(pos, bv->bv_page, bv->bv_offset,
bv->bv_len, preq, inode);
if (nreq == NULL) {
PLOOP_REQ_SET_ERROR(preq, -ENOMEM);
goto out;
}
pos += bv->bv_len;
prev_end = bv->bv_offset + bv->bv_len;
}
}
if (nreq) {
int err;
atomic_inc(&preq->io_count);
err = rbio_submit(io, nreq, &nfsio_read_ops);
if (err) {
PLOOP_REQ_SET_ERROR(preq, err);
ploop_complete_io_request(preq);
goto out;
}
}
out:
ploop_complete_io_request(preq);
}
static void nfsio_write_result(struct rpc_task *task, void *calldata)
{
struct nfs_write_data *data = calldata;
struct nfs_writeargs *argp = &data->args;
struct nfs_writeres *resp = &data->res;
int status;
status = NFS_PROTO(data->header->inode)->write_done(task, data);
if (status != 0)
return;
if (task->tk_status >= 0 && resp->count < argp->count)
task->tk_status = -EIO;
}
static void nfsio_write_release(void *calldata)
{
struct nfs_write_data *nreq = calldata;
struct ploop_request *preq = (struct ploop_request *) nreq->header->req;
int status = nreq->task.tk_status;
if (unlikely(status < 0))
PLOOP_REQ_SET_ERROR(preq, status);
if (!preq->error &&
nreq->res.verf->committed != NFS_FILE_SYNC) {
if (!test_and_set_bit(PLOOP_REQ_UNSTABLE, &preq->state))
memcpy(&preq->verf, &nreq->res.verf->verifier, 8);
}
nfsio_complete_io_request(preq);
nfsio_wbio_release(calldata);
}
static const struct rpc_call_ops nfsio_write_ops = {
.rpc_call_done = nfsio_write_result,
.rpc_release = nfsio_write_release,
};
static struct nfs_write_data *
wbio_init(loff_t pos, struct page * page, unsigned int off, unsigned int len,
void * priv, struct inode * inode)
{
struct nfs_write_data * nreq;
nreq = nfsio_wbio_alloc(MAX_NBIO_PAGES);
if (unlikely(nreq == NULL))
return NULL;
nreq->args.offset = pos;
nreq->args.pgbase = off;
nreq->args.count = len;
nreq->pages.pagevec[0] = page;
nreq->pages.npages = 1;
nreq->header->req = priv;
nreq->header->inode = inode;
nreq->args.fh = NFS_FH(inode);
nreq->args.pages = nreq->pages.pagevec;
nreq->args.stable = NFS_UNSTABLE;
nreq->res.fattr = &nreq->fattr;
nreq->res.verf = &nreq->verf;
return nreq;
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
static int wbio_submit(struct ploop_io * io, struct nfs_write_data *nreq,
const struct rpc_call_ops * cb)
{
struct nfs_open_context *ctx = nfs_file_open_context(io->files.file);
struct inode *inode = io->files.inode;
struct rpc_task *task;
struct rpc_message msg = {
.rpc_cred = ctx->cred,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = NFS_CLIENT(inode),
.rpc_message = &msg,
.callback_ops = cb,
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
.workqueue = nfsio_workqueue,
#endif
.flags = RPC_TASK_ASYNC,
};
if (verify_bounce(nreq))
return -ENOMEM;
nreq->res.count = nreq->args.count;
nreq->args.context = ctx;
nreq->header->cred = msg.rpc_cred;
task_setup_data.task = &nreq->task;
task_setup_data.callback_data = nreq;
msg.rpc_argp = &nreq->args;
msg.rpc_resp = &nreq->res;
NFS_PROTO(inode)->write_setup(nreq, &msg);
task = rpc_run_task(&task_setup_data);
if (unlikely(IS_ERR(task)))
return PTR_ERR(task);
rpc_put_task(task);
return 0;
}
#else
static int wbio_submit(struct ploop_io * io, struct nfs_write_data *nreq,
const struct rpc_call_ops * cb)
{
struct nfs_open_context *ctx = nfs_file_open_context(io->files.file);
struct inode *inode = io->files.inode;
if (verify_bounce(nreq))
return -ENOMEM;
nreq->res.count = nreq->args.count;
nreq->args.context = ctx;
nreq->cred = ctx->cred;
rpc_init_task(&nreq->task, NFS_CLIENT(inode), RPC_TASK_ASYNC, cb, nreq);
NFS_PROTO(inode)->write_setup(nreq, NFS_UNSTABLE);
nreq->task.tk_priority = RPC_PRIORITY_NORMAL;
nreq->task.tk_cookie = (unsigned long) inode;
lock_kernel();
rpc_execute(&nreq->task);
unlock_kernel();
return 0;
}
#endif
static void
nfsio_submit_write(struct ploop_io *io, struct ploop_request * preq,
struct bio_list *sbl, iblock_t iblk, unsigned int size)
{
struct inode *inode = io->files.inode;
size_t wsize = NFS_SERVER(inode)->wsize;
struct nfs_write_data *nreq = NULL;
loff_t pos;
struct bio * b;
unsigned int prev_end;
nfsio_prepare_io_request(preq);
pos = sbl->head->bi_sector;
pos = ((loff_t)iblk << preq->plo->cluster_log) | (pos & ((1<<preq->plo->cluster_log) - 1));
ploop_prepare_tracker(preq, pos);
pos <<= 9;
prev_end = PAGE_SIZE;
for (b = sbl->head; b != NULL; b = b->bi_next) {
int bv_idx;
for (bv_idx = 0; bv_idx < b->bi_vcnt; bv_idx++) {
struct bio_vec * bv = &b->bi_io_vec[bv_idx];
if (nreq && nreq->args.count + bv->bv_len <= wsize) {
if (nreq->pages.pagevec[nreq->pages.npages-1] == bv->bv_page &&
prev_end == bv->bv_offset) {
nreq->args.count += bv->bv_len;
pos += bv->bv_len;
prev_end += bv->bv_len;
continue;
}
if (nreq->pages.npages < MAX_NBIO_PAGES &&
bv->bv_offset == 0 && prev_end == PAGE_SIZE) {
nreq->args.count += bv->bv_len;
nreq->pages.pagevec[nreq->pages.npages] = bv->bv_page;
nreq->pages.npages++;
pos += bv->bv_len;
prev_end = bv->bv_offset + bv->bv_len;
continue;
}
}
if (nreq) {
int err;
atomic_inc(&preq->io_count);
err = wbio_submit(io, nreq, &nfsio_write_ops);
if (err) {
PLOOP_REQ_SET_ERROR(preq, err);
nfsio_complete_io_request(preq);
goto out;
}
}
nreq = wbio_init(pos, bv->bv_page, bv->bv_offset,
bv->bv_len, preq, inode);
if (nreq == NULL) {
PLOOP_REQ_SET_ERROR(preq, -ENOMEM);
goto out;
}
prev_end = bv->bv_offset + bv->bv_len;
pos += bv->bv_len;
}
}
if (nreq) {
int err;
atomic_inc(&preq->io_count);
err = wbio_submit(io, nreq, &nfsio_write_ops);
if (err) {
PLOOP_REQ_SET_ERROR(preq, err);
nfsio_complete_io_request(preq);
}
}
out:
nfsio_complete_io_request(preq);
}
static void
nfsio_submit(struct ploop_io *io, struct ploop_request * preq,
unsigned long rw,
struct bio_list *sbl, iblock_t iblk, unsigned int size)
{
if (iblk == PLOOP_ZERO_INDEX)
iblk = 0;
if (rw & (1<<BIO_RW))
nfsio_submit_write(io, preq, sbl, iblk, size);
else
nfsio_submit_read(io, preq, sbl, iblk, size);
}
struct bio_list_walk
{
struct bio * cur;
int idx;
int bv_off;
};
static void
nfsio_submit_write_pad(struct ploop_io *io, struct ploop_request * preq,
struct bio_list *sbl, iblock_t iblk, unsigned int size)
{
struct inode *inode = io->files.inode;
size_t wsize = NFS_SERVER(inode)->wsize;
struct nfs_write_data *nreq = NULL;
struct bio_list_walk bw;
unsigned prev_end;
loff_t pos, end_pos, start, end;
/* pos..end_pos is the range which we are going to write */
pos = (loff_t)iblk << (preq->plo->cluster_log + 9);
end_pos = pos + (1 << (preq->plo->cluster_log + 9));
/* start..end is data that we have. The rest must be zero padded. */
start = pos + ((sbl->head->bi_sector & ((1<<preq->plo->cluster_log) - 1)) << 9);
end = start + (size << 9);
nfsio_prepare_io_request(preq);
ploop_prepare_tracker(preq, start >> 9);
prev_end = PAGE_SIZE;
#if 1
/* GCC, shut up! */
bw.cur = sbl->head;
bw.idx = 0;
bw.bv_off = 0;
BUG_ON(bw.cur->bi_io_vec[0].bv_len & 511);
#endif
while (pos < end_pos) {
struct page * page;
unsigned int poff, plen;
if (pos < start) {
page = ZERO_PAGE(0);
poff = 0;
plen = start - pos;
if (plen > PAGE_SIZE)
plen = PAGE_SIZE;
} else if (pos >= end) {
page = ZERO_PAGE(0);
poff = 0;
plen = end_pos - pos;
if (plen > PAGE_SIZE)
plen = PAGE_SIZE;
} else {
/* pos >= start && pos < end */
struct bio_vec * bv;
if (pos == start) {
bw.cur = sbl->head;
bw.idx = 0;
bw.bv_off = 0;
BUG_ON(bw.cur->bi_io_vec[0].bv_len & 511);
}
bv = bw.cur->bi_io_vec + bw.idx;
if (bw.bv_off >= bv->bv_len) {
bw.idx++;
bv++;
bw.bv_off = 0;
if (bw.idx >= bw.cur->bi_vcnt) {
bw.cur = bw.cur->bi_next;
bw.idx = 0;
bw.bv_off = 0;
bv = bw.cur->bi_io_vec;
}
BUG_ON(bv->bv_len & 511);
}
page = bv->bv_page;
poff = bv->bv_offset + bw.bv_off;
plen = bv->bv_len - bw.bv_off;
}
if (nreq && nreq->args.count + plen <= wsize) {
if (nreq->pages.pagevec[nreq->pages.npages-1] == page &&
prev_end == poff) {
nreq->args.count += plen;
pos += plen;
bw.bv_off += plen;
prev_end += plen;
continue;
}
if (nreq->pages.npages < MAX_NBIO_PAGES &&
poff == 0 && prev_end == PAGE_SIZE) {
nreq->args.count += plen;
nreq->pages.pagevec[nreq->pages.npages] = page;
nreq->pages.npages++;
pos += plen;
bw.bv_off += plen;
prev_end = poff + plen;
continue;
}
}
if (nreq) {
int err;
atomic_inc(&preq->io_count);
err = wbio_submit(io, nreq, &nfsio_write_ops);
if (err) {
PLOOP_REQ_SET_ERROR(preq, err);
nfsio_complete_io_request(preq);
goto out;
}
}
nreq = wbio_init(pos, page, poff, plen, preq, inode);
if (nreq == NULL) {
PLOOP_REQ_SET_ERROR(preq, -ENOMEM);
goto out;
}
prev_end = poff + plen;
pos += plen;
bw.bv_off += plen;
}
if (nreq) {
int err;
atomic_inc(&preq->io_count);
err = wbio_submit(io, nreq, &nfsio_write_ops);
if (err) {
PLOOP_REQ_SET_ERROR(preq, err);
nfsio_complete_io_request(preq);
}
}
out:
nfsio_complete_io_request(preq);
}
static void
nfsio_submit_alloc(struct ploop_io *io, struct ploop_request * preq,
struct bio_list * sbl, unsigned int size)
{
iblock_t iblk = io->alloc_head++;
if (!(io->files.file->f_mode & FMODE_WRITE)) {
PLOOP_FAIL_REQUEST(preq, -EBADF);
return;
}
preq->iblock = iblk;
preq->eng_state = PLOOP_E_DATA_WBI;
nfsio_submit_write_pad(io, preq, sbl, iblk, size);
}
static void nfsio_destroy(struct ploop_io * io)
{
if (io->fsync_thread) {
kthread_stop(io->fsync_thread);
io->fsync_thread = NULL;
}
if (io->files.file) {
struct file * file = io->files.file;
mutex_lock(&io->plo->sysfs_mutex);
io->files.file = NULL;
if (io->files.mapping)
(void)invalidate_inode_pages2(io->files.mapping);
mutex_unlock(&io->plo->sysfs_mutex);
fput(file);
}
}
static int nfsio_sync(struct ploop_io * io)
{
return 0;
}
static int nfsio_stop(struct ploop_io * io)
{
return 0;
}
static int
nfsio_init(struct ploop_io * io)
{
INIT_LIST_HEAD(&io->fsync_queue);
init_waitqueue_head(&io->fsync_waitq);
return 0;
}
int
nfs_sillyrename(struct inode *dir, struct dentry *dentry)
{
static unsigned int sillycounter;
const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2;
const int countersize = sizeof(sillycounter)*2;
const int slen = sizeof(".nfs")+fileidsize+countersize-1;
char silly[slen+1];
struct dentry *sdentry;
struct rpc_task *task;
int error = -EIO;
dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
dentry->d_count);
nfs_inc_stats(dir, NFSIOS_SILLYRENAME);
error = -EBUSY;
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto out;
sprintf(silly, ".nfs%*.*Lx",
fileidsize, fileidsize,
(unsigned long long)NFS_FILEID(dentry->d_inode));
nfs_inode_return_delegation(dentry->d_inode);
sdentry = NULL;
do {
char *suffix = silly + slen - countersize;
dput(sdentry);
sillycounter++;
sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);
dfprintk(VFS, "NFS: trying to rename %s to %s\n",
dentry->d_name.name, silly);
sdentry = lookup_one_len(silly, dentry->d_parent, slen);
if (IS_ERR(sdentry))
goto out;
} while (sdentry->d_inode != NULL);
error = nfs_async_unlink(dir, dentry);
if (error)
goto out_dput;
error = nfs_copy_dname(sdentry,
(struct nfs_unlinkdata *)dentry->d_fsdata);
if (error) {
nfs_cancel_async_unlink(dentry);
goto out_dput;
}
task = nfs_async_rename(dir, dir, dentry, sdentry);
if (IS_ERR(task)) {
error = -EBUSY;
nfs_cancel_async_unlink(dentry);
goto out_dput;
}
error = rpc_wait_for_completion_task(task);
if (error == 0)
error = task->tk_status;
switch (error) {
case 0:
/* The rename succeeded */
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
d_move(dentry, sdentry);
break;
case -ERESTARTSYS:
/* The result of the rename is unknown. Play it safe by
* forcing a new lookup */
d_drop(dentry);
d_drop(sdentry);
}
rpc_put_task(task);
out_dput:
dput(sdentry);
out:
return error;
}
