fs/nfsd/flexfilelayout.c

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