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 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_raw, 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.%d.%d", 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