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Have a simple flex file server where the mds (NFSv4.1 or NFSv4.2) is also the ds (NFSv3). I.e., the metadata and the data file are the exact same file. This will allow testing of the flex file client. Simply add the "pnfs" export option to your export in /etc/exports and mount from a client that supports flex files. Signed-off-by: Tom Haynes <loghyr@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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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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.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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