1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2016 Tom Haynes <loghyr@primarydata.com>
4 *
5 * The following implements a super-simple flex-file server
6 * where the NFSv4.1 mds is also the ds. And the storage is
7 * the same. I.e., writing to the mds via a NFSv4.1 WRITE
8 * goes to the same location as the NFSv3 WRITE.
9 */
10 #include <linux/slab.h>
11
12 #include <linux/nfsd/debug.h>
13
14 #include <linux/sunrpc/addr.h>
15
16 #include "flexfilelayoutxdr.h"
17 #include "pnfs.h"
18
19 #define NFSDDBG_FACILITY NFSDDBG_PNFS
20
21 static __be32
nfsd4_ff_proc_layoutget(struct inode * inode,const struct svc_fh * fhp,struct nfsd4_layoutget * args)22 nfsd4_ff_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
23 struct nfsd4_layoutget *args)
24 {
25 struct nfsd4_layout_seg *seg = &args->lg_seg;
26 u32 device_generation = 0;
27 int error;
28 uid_t u;
29
30 struct pnfs_ff_layout *fl;
31
32 /*
33 * The super simple flex file server has 1 mirror, 1 data server,
34 * and 1 file handle. So instead of 4 allocs, do 1 for now.
35 * Zero it out for the stateid - don't want junk in there!
36 */
37 error = -ENOMEM;
38 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
39 if (!fl)
40 goto out_error;
41 args->lg_content = fl;
42
43 /*
44 * Avoid layout commit, try to force the I/O to the DS,
45 * and for fun, cause all IOMODE_RW layout segments to
46 * effectively be WRITE only.
47 */
48 fl->flags = FF_FLAGS_NO_LAYOUTCOMMIT | FF_FLAGS_NO_IO_THRU_MDS |
49 FF_FLAGS_NO_READ_IO;
50
51 /* Do not allow a IOMODE_READ segment to have write pemissions */
52 if (seg->iomode == IOMODE_READ) {
53 u = from_kuid(&init_user_ns, inode->i_uid) + 1;
54 fl->uid = make_kuid(&init_user_ns, u);
55 } else
56 fl->uid = inode->i_uid;
57 fl->gid = inode->i_gid;
58
59 error = nfsd4_set_deviceid(&fl->deviceid, fhp, device_generation);
60 if (error)
61 goto out_error;
62
63 fl->fh.size = fhp->fh_handle.fh_size;
64 memcpy(fl->fh.data, &fhp->fh_handle.fh_base, fl->fh.size);
65
66 /* Give whole file layout segments */
67 seg->offset = 0;
68 seg->length = NFS4_MAX_UINT64;
69
70 dprintk("GET: 0x%llx:0x%llx %d\n", seg->offset, seg->length,
71 seg->iomode);
72 return 0;
73
74 out_error:
75 seg->length = 0;
76 return nfserrno(error);
77 }
78
79 static __be32
nfsd4_ff_proc_getdeviceinfo(struct super_block * sb,struct svc_rqst * rqstp,struct nfs4_client * clp,struct nfsd4_getdeviceinfo * gdp)80 nfsd4_ff_proc_getdeviceinfo(struct super_block *sb, struct svc_rqst *rqstp,
81 struct nfs4_client *clp, struct nfsd4_getdeviceinfo *gdp)
82 {
83 struct pnfs_ff_device_addr *da;
84
85 u16 port;
86 char addr[INET6_ADDRSTRLEN];
87
88 da = kzalloc(sizeof(struct pnfs_ff_device_addr), GFP_KERNEL);
89 if (!da)
90 return nfserrno(-ENOMEM);
91
92 gdp->gd_device = da;
93
94 da->version = 3;
95 da->minor_version = 0;
96
97 da->rsize = svc_max_payload(rqstp);
98 da->wsize = da->rsize;
99
100 rpc_ntop((struct sockaddr *)&rqstp->rq_daddr,
101 addr, INET6_ADDRSTRLEN);
102 if (rqstp->rq_daddr.ss_family == AF_INET) {
103 struct sockaddr_in *sin;
104
105 sin = (struct sockaddr_in *)&rqstp->rq_daddr;
106 port = ntohs(sin->sin_port);
107 snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp");
108 da->netaddr.netid_len = 3;
109 } else {
110 struct sockaddr_in6 *sin6;
111
112 sin6 = (struct sockaddr_in6 *)&rqstp->rq_daddr;
113 port = ntohs(sin6->sin6_port);
114 snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp6");
115 da->netaddr.netid_len = 4;
116 }
117
118 da->netaddr.addr_len =
119 snprintf(da->netaddr.addr, FF_ADDR_LEN + 1,
120 "%s.%hhu.%hhu", addr, port >> 8, port & 0xff);
121
122 da->tightly_coupled = false;
123
124 return 0;
125 }
126
127 const struct nfsd4_layout_ops ff_layout_ops = {
128 .notify_types =
129 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
130 .disable_recalls = true,
131 .proc_getdeviceinfo = nfsd4_ff_proc_getdeviceinfo,
132 .encode_getdeviceinfo = nfsd4_ff_encode_getdeviceinfo,
133 .proc_layoutget = nfsd4_ff_proc_layoutget,
134 .encode_layoutget = nfsd4_ff_encode_layoutget,
135 };
136