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/*
* Copyright (c) 2016 Tom Haynes <loghyr@primarydata.com>
*
* The following implements a super-simple flex-file server
* where the NFSv4.1 mds is also the ds. And the storage is
* the same. I.e., writing to the mds via a NFSv4.1 WRITE
* goes to the same location as the NFSv3 WRITE.
*/
#include <linux/slab.h>
#include <linux/nfsd/debug.h>
#include <linux/sunrpc/addr.h>
#include "flexfilelayoutxdr.h"
#include "pnfs.h"
#define NFSDDBG_FACILITY NFSDDBG_PNFS
static __be32
nfsd4_ff_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
struct nfsd4_layoutget *args)
{
struct nfsd4_layout_seg *seg = &args->lg_seg;
u32 device_generation = 0;
int error;
uid_t u;
struct pnfs_ff_layout *fl;
/*
* The super simple flex file server has 1 mirror, 1 data server,
* and 1 file handle. So instead of 4 allocs, do 1 for now.
* Zero it out for the stateid - don't want junk in there!
*/
error = -ENOMEM;
fl = kzalloc(sizeof(*fl), GFP_KERNEL);
if (!fl)
goto out_error;
args->lg_content = fl;
/*
* Avoid layout commit, try to force the I/O to the DS,
* and for fun, cause all IOMODE_RW layout segments to
* effectively be WRITE only.
*/
fl->flags = FF_FLAGS_NO_LAYOUTCOMMIT | FF_FLAGS_NO_IO_THRU_MDS |
FF_FLAGS_NO_READ_IO;
/* Do not allow a IOMODE_READ segment to have write pemissions */
if (seg->iomode == IOMODE_READ) {
u = from_kuid(&init_user_ns, inode->i_uid) + 1;
fl->uid = make_kuid(&init_user_ns, u);
} else
fl->uid = inode->i_uid;
fl->gid = inode->i_gid;
error = nfsd4_set_deviceid(&fl->deviceid, fhp, device_generation);
if (error)
goto out_error;
fl->fh.size = fhp->fh_handle.fh_size;
memcpy(fl->fh.data, &fhp->fh_handle.fh_base, fl->fh.size);
/* Give whole file layout segments */
seg->offset = 0;
seg->length = NFS4_MAX_UINT64;
dprintk("GET: 0x%llx:0x%llx %d\n", seg->offset, seg->length,
seg->iomode);
return 0;
out_error:
seg->length = 0;
return nfserrno(error);
}
static __be32
nfsd4_ff_proc_getdeviceinfo(struct super_block *sb, struct svc_rqst *rqstp,
struct nfs4_client *clp, struct nfsd4_getdeviceinfo *gdp)
{
struct pnfs_ff_device_addr *da;
u16 port;
char addr[INET6_ADDRSTRLEN];
da = kzalloc(sizeof(struct pnfs_ff_device_addr), GFP_KERNEL);
if (!da)
return nfserrno(-ENOMEM);
gdp->gd_device = da;
da->version = 3;
da->minor_version = 0;
da->rsize = svc_max_payload(rqstp);
da->wsize = da->rsize;
rpc_ntop((struct sockaddr *)&rqstp->rq_daddr,
addr, INET6_ADDRSTRLEN);
if (rqstp->rq_daddr.ss_family == AF_INET) {
struct sockaddr_in *sin;
sin = (struct sockaddr_in *)&rqstp->rq_daddr;
port = ntohs(sin->sin_port);
snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp");
da->netaddr.netid_len = 3;
} else {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)&rqstp->rq_daddr;
port = ntohs(sin6->sin6_port);
snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp6");
da->netaddr.netid_len = 4;
}
da->netaddr.addr_len =
snprintf(da->netaddr.addr, FF_ADDR_LEN + 1,
"%s.%hhu.%hhu", addr, port >> 8, port & 0xff);
da->tightly_coupled = false;
return 0;
}
const struct nfsd4_layout_ops ff_layout_ops = {
.notify_types =
NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
.proc_getdeviceinfo = nfsd4_ff_proc_getdeviceinfo,
.encode_getdeviceinfo = nfsd4_ff_encode_getdeviceinfo,
.proc_layoutget = nfsd4_ff_proc_layoutget,
.encode_layoutget = nfsd4_ff_encode_layoutget,
};
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