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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9b9960a0 TH |
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 | |
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 | |
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, | |
1983a66f | 130 | .disable_recalls = true, |
9b9960a0 TH |
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 | }; |