fs/nfs/nfs42proc.c

   1 /*
   2  * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
   3  */
   4 #include <linux/fs.h>
   5 #include <linux/sunrpc/sched.h>
   6 #include <linux/nfs.h>
   7 #include <linux/nfs3.h>
   8 #include <linux/nfs4.h>
   9 #include <linux/nfs_xdr.h>
  10 #include <linux/nfs_fs.h>
  11 #include "nfs4_fs.h"
  12 #include "nfs42.h"
  13
  14 static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
  15                                 fmode_t fmode)
  16 {
  17         struct nfs_open_context *open;
  18         struct nfs_lock_context *lock;
  19         int ret;
  20
  21         open = get_nfs_open_context(nfs_file_open_context(file));
  22         lock = nfs_get_lock_context(open);
  23         if (IS_ERR(lock)) {
  24                 put_nfs_open_context(open);
  25                 return PTR_ERR(lock);
  26         }
  27
  28         ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
  29
  30         nfs_put_lock_context(lock);
  31         put_nfs_open_context(open);
  32         return ret;
  33 }
  34
  35 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  36                                  loff_t offset, loff_t len)
  37 {
  38         struct inode *inode = file_inode(filep);
  39         struct nfs42_falloc_args args = {
  40                 .falloc_fh      = NFS_FH(inode),
  41                 .falloc_offset  = offset,
  42                 .falloc_length  = len,
  43         };
  44         struct nfs42_falloc_res res;
  45         struct nfs_server *server = NFS_SERVER(inode);
  46         int status;
  47
  48         msg->rpc_argp = &args;
  49         msg->rpc_resp = &res;
  50
  51         status = nfs42_set_rw_stateid(&args.falloc_stateid, filep, FMODE_WRITE);
  52         if (status)
  53                 return status;
  54
  55         return nfs4_call_sync(server->client, server, msg,
  56                               &args.seq_args, &res.seq_res, 0);
  57 }
  58
  59 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  60                                 loff_t offset, loff_t len)
  61 {
  62         struct nfs_server *server = NFS_SERVER(file_inode(filep));
  63         struct nfs4_exception exception = { };
  64         int err;
  65
  66         do {
  67                 err = _nfs42_proc_fallocate(msg, filep, offset, len);
  68                 if (err == -ENOTSUPP)
  69                         return -EOPNOTSUPP;
  70                 err = nfs4_handle_exception(server, err, &exception);
  71         } while (exception.retry);
  72
  73         return err;
  74 }
  75
  76 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
  77 {
  78         struct rpc_message msg = {
  79                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
  80         };
  81         struct inode *inode = file_inode(filep);
  82         int err;
  83
  84         if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
  85                 return -EOPNOTSUPP;
  86
  87         err = nfs42_proc_fallocate(&msg, filep, offset, len);
  88         if (err == -EOPNOTSUPP)
  89                 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
  90         return err;
  91 }
  92
  93 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
  94 {
  95         struct rpc_message msg = {
  96                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
  97         };
  98         struct inode *inode = file_inode(filep);
  99         int err;
 100
 101         if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
 102                 return -EOPNOTSUPP;
 103
 104         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 105         if (err == -EOPNOTSUPP)
 106                 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
 107         return err;
 108 }
 109
 110 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 111 {
 112         struct inode *inode = file_inode(filep);
 113         struct nfs42_seek_args args = {
 114                 .sa_fh          = NFS_FH(inode),
 115                 .sa_offset      = offset,
 116                 .sa_what        = (whence == SEEK_HOLE) ?
 117                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 118         };
 119         struct nfs42_seek_res res;
 120         struct rpc_message msg = {
 121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 122                 .rpc_argp = &args,
 123                 .rpc_resp = &res,
 124         };
 125         struct nfs_server *server = NFS_SERVER(inode);
 126         int status;
 127
 128         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 129                 return -ENOTSUPP;
 130
 131         status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
 132         if (status)
 133                 return status;
 134
 135         nfs_wb_all(inode);
 136         status = nfs4_call_sync(server->client, server, &msg,
 137                                 &args.seq_args, &res.seq_res, 0);
 138         if (status == -ENOTSUPP)
 139                 server->caps &= ~NFS_CAP_SEEK;
 140         if (status)
 141                 return status;
 142
 143         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 144 }