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 | #include "vfs.h" |
19 | |
20 | #define NFSDDBG_FACILITY NFSDDBG_PNFS |
21 | |
22 | static __be32 |
23 | nfsd4_ff_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, |
24 | struct nfsd4_layoutget *args) |
25 | { |
26 | struct nfsd4_layout_seg *seg = &args->lg_seg; |
27 | u32 device_generation = 0; |
28 | int error; |
29 | uid_t u; |
30 | |
31 | struct pnfs_ff_layout *fl; |
32 | |
33 | /* |
34 | * The super simple flex file server has 1 mirror, 1 data server, |
35 | * and 1 file handle. So instead of 4 allocs, do 1 for now. |
36 | * Zero it out for the stateid - don't want junk in there! |
37 | */ |
38 | error = -ENOMEM; |
39 | fl = kzalloc(size: sizeof(*fl), GFP_KERNEL); |
40 | if (!fl) |
41 | goto out_error; |
42 | args->lg_content = fl; |
43 | |
44 | /* |
45 | * Avoid layout commit, try to force the I/O to the DS, |
46 | * and for fun, cause all IOMODE_RW layout segments to |
47 | * effectively be WRITE only. |
48 | */ |
49 | fl->flags = FF_FLAGS_NO_LAYOUTCOMMIT | FF_FLAGS_NO_IO_THRU_MDS | |
50 | FF_FLAGS_NO_READ_IO; |
51 | |
52 | /* Do not allow a IOMODE_READ segment to have write pemissions */ |
53 | if (seg->iomode == IOMODE_READ) { |
54 | u = from_kuid(to: &init_user_ns, uid: inode->i_uid) + 1; |
55 | fl->uid = make_kuid(from: &init_user_ns, uid: u); |
56 | } else |
57 | fl->uid = inode->i_uid; |
58 | fl->gid = inode->i_gid; |
59 | |
60 | error = nfsd4_set_deviceid(id: &fl->deviceid, fhp, device_generation); |
61 | if (error) |
62 | goto out_error; |
63 | |
64 | fl->fh.size = fhp->fh_handle.fh_size; |
65 | memcpy(fl->fh.data, &fhp->fh_handle.fh_raw, fl->fh.size); |
66 | |
67 | /* Give whole file layout segments */ |
68 | seg->offset = 0; |
69 | seg->length = NFS4_MAX_UINT64; |
70 | |
71 | dprintk("GET: 0x%llx:0x%llx %d\n" , seg->offset, seg->length, |
72 | seg->iomode); |
73 | return 0; |
74 | |
75 | out_error: |
76 | seg->length = 0; |
77 | return nfserrno(errno: error); |
78 | } |
79 | |
80 | static __be32 |
81 | nfsd4_ff_proc_getdeviceinfo(struct super_block *sb, struct svc_rqst *rqstp, |
82 | struct nfs4_client *clp, struct nfsd4_getdeviceinfo *gdp) |
83 | { |
84 | struct pnfs_ff_device_addr *da; |
85 | |
86 | u16 port; |
87 | char addr[INET6_ADDRSTRLEN]; |
88 | |
89 | da = kzalloc(size: sizeof(struct pnfs_ff_device_addr), GFP_KERNEL); |
90 | if (!da) |
91 | return nfserrno(errno: -ENOMEM); |
92 | |
93 | gdp->gd_device = da; |
94 | |
95 | da->version = 3; |
96 | da->minor_version = 0; |
97 | |
98 | da->rsize = svc_max_payload(rqstp); |
99 | da->wsize = da->rsize; |
100 | |
101 | rpc_ntop((struct sockaddr *)&rqstp->rq_daddr, |
102 | addr, INET6_ADDRSTRLEN); |
103 | if (rqstp->rq_daddr.ss_family == AF_INET) { |
104 | struct sockaddr_in *sin; |
105 | |
106 | sin = (struct sockaddr_in *)&rqstp->rq_daddr; |
107 | port = ntohs(sin->sin_port); |
108 | snprintf(buf: da->netaddr.netid, FF_NETID_LEN + 1, fmt: "tcp" ); |
109 | da->netaddr.netid_len = 3; |
110 | } else { |
111 | struct sockaddr_in6 *sin6; |
112 | |
113 | sin6 = (struct sockaddr_in6 *)&rqstp->rq_daddr; |
114 | port = ntohs(sin6->sin6_port); |
115 | snprintf(buf: da->netaddr.netid, FF_NETID_LEN + 1, fmt: "tcp6" ); |
116 | da->netaddr.netid_len = 4; |
117 | } |
118 | |
119 | da->netaddr.addr_len = |
120 | snprintf(buf: da->netaddr.addr, FF_ADDR_LEN + 1, |
121 | fmt: "%s.%d.%d" , addr, port >> 8, port & 0xff); |
122 | |
123 | da->tightly_coupled = false; |
124 | |
125 | return 0; |
126 | } |
127 | |
128 | const struct nfsd4_layout_ops ff_layout_ops = { |
129 | .notify_types = |
130 | NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, |
131 | .disable_recalls = true, |
132 | .proc_getdeviceinfo = nfsd4_ff_proc_getdeviceinfo, |
133 | .encode_getdeviceinfo = nfsd4_ff_encode_getdeviceinfo, |
134 | .proc_layoutget = nfsd4_ff_proc_layoutget, |
135 | .encode_layoutget = nfsd4_ff_encode_layoutget, |
136 | }; |
137 | |