136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016 Tom Haynes <loghyr@primarydata.com>
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*
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* The following implements a super-simple flex-file server
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* where the NFSv4.1 mds is also the ds. And the storage is
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* the same. I.e., writing to the mds via a NFSv4.1 WRITE
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* goes to the same location as the NFSv3 WRITE.
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*/
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#include <linux/slab.h>
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#include <linux/nfsd/debug.h>
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#include <linux/sunrpc/addr.h>
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#include "flexfilelayoutxdr.h"
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#include "pnfs.h"
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#define NFSDDBG_FACILITY NFSDDBG_PNFS
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static __be32
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nfsd4_ff_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
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struct nfsd4_layoutget *args)
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{
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struct nfsd4_layout_seg *seg = &args->lg_seg;
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u32 device_generation = 0;
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int error;
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uid_t u;
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struct pnfs_ff_layout *fl;
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/*
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* The super simple flex file server has 1 mirror, 1 data server,
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* and 1 file handle. So instead of 4 allocs, do 1 for now.
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* Zero it out for the stateid - don't want junk in there!
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*/
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error = -ENOMEM;
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fl = kzalloc(sizeof(*fl), GFP_KERNEL);
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if (!fl)
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goto out_error;
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args->lg_content = fl;
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/*
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* Avoid layout commit, try to force the I/O to the DS,
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* and for fun, cause all IOMODE_RW layout segments to
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* effectively be WRITE only.
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*/
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fl->flags = FF_FLAGS_NO_LAYOUTCOMMIT | FF_FLAGS_NO_IO_THRU_MDS |
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FF_FLAGS_NO_READ_IO;
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/* Do not allow a IOMODE_READ segment to have write pemissions */
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if (seg->iomode == IOMODE_READ) {
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u = from_kuid(&init_user_ns, inode->i_uid) + 1;
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fl->uid = make_kuid(&init_user_ns, u);
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} else
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fl->uid = inode->i_uid;
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fl->gid = inode->i_gid;
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error = nfsd4_set_deviceid(&fl->deviceid, fhp, device_generation);
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if (error)
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goto out_error;
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fl->fh.size = fhp->fh_handle.fh_size;
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memcpy(fl->fh.data, &fhp->fh_handle.fh_base, fl->fh.size);
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/* Give whole file layout segments */
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seg->offset = 0;
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seg->length = NFS4_MAX_UINT64;
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dprintk("GET: 0x%llx:0x%llx %d\n", seg->offset, seg->length,
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seg->iomode);
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return 0;
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out_error:
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seg->length = 0;
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return nfserrno(error);
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}
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static __be32
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nfsd4_ff_proc_getdeviceinfo(struct super_block *sb, struct svc_rqst *rqstp,
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struct nfs4_client *clp, struct nfsd4_getdeviceinfo *gdp)
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{
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struct pnfs_ff_device_addr *da;
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u16 port;
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char addr[INET6_ADDRSTRLEN];
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da = kzalloc(sizeof(struct pnfs_ff_device_addr), GFP_KERNEL);
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if (!da)
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return nfserrno(-ENOMEM);
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gdp->gd_device = da;
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da->version = 3;
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da->minor_version = 0;
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da->rsize = svc_max_payload(rqstp);
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da->wsize = da->rsize;
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rpc_ntop((struct sockaddr *)&rqstp->rq_daddr,
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addr, INET6_ADDRSTRLEN);
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if (rqstp->rq_daddr.ss_family == AF_INET) {
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struct sockaddr_in *sin;
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sin = (struct sockaddr_in *)&rqstp->rq_daddr;
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port = ntohs(sin->sin_port);
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snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp");
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da->netaddr.netid_len = 3;
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} else {
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struct sockaddr_in6 *sin6;
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sin6 = (struct sockaddr_in6 *)&rqstp->rq_daddr;
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port = ntohs(sin6->sin6_port);
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snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp6");
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da->netaddr.netid_len = 4;
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}
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da->netaddr.addr_len =
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snprintf(da->netaddr.addr, FF_ADDR_LEN + 1,
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"%s.%hhu.%hhu", addr, port >> 8, port & 0xff);
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da->tightly_coupled = false;
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return 0;
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}
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const struct nfsd4_layout_ops ff_layout_ops = {
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.notify_types =
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NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
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.disable_recalls = true,
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.proc_getdeviceinfo = nfsd4_ff_proc_getdeviceinfo,
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.encode_getdeviceinfo = nfsd4_ff_encode_getdeviceinfo,
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.proc_layoutget = nfsd4_ff_proc_layoutget,
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.encode_layoutget = nfsd4_ff_encode_layoutget,
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};
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