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 #include "iostat.h"
  14 #include "pnfs.h"
  15 #include "internal.h"
  16
  17 #define NFSDBG_FACILITY NFSDBG_PNFS
  18
  19 static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
  20                                 fmode_t fmode)
  21 {
  22         struct nfs_open_context *open;
  23         struct nfs_lock_context *lock;
  24         int ret;
  25
  26         open = get_nfs_open_context(nfs_file_open_context(file));
  27         lock = nfs_get_lock_context(open);
  28         if (IS_ERR(lock)) {
  29                 put_nfs_open_context(open);
  30                 return PTR_ERR(lock);
  31         }
  32
  33         ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
  34
  35         nfs_put_lock_context(lock);
  36         put_nfs_open_context(open);
  37         return ret;
  38 }
  39
  40 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  41                                  loff_t offset, loff_t len)
  42 {
  43         struct inode *inode = file_inode(filep);
  44         struct nfs_server *server = NFS_SERVER(inode);
  45         struct nfs42_falloc_args args = {
  46                 .falloc_fh      = NFS_FH(inode),
  47                 .falloc_offset  = offset,
  48                 .falloc_length  = len,
  49                 .falloc_bitmask = server->cache_consistency_bitmask,
  50         };
  51         struct nfs42_falloc_res res = {
  52                 .falloc_server  = server,
  53         };
  54         int status;
  55
  56         msg->rpc_argp = &args;
  57         msg->rpc_resp = &res;
  58
  59         status = nfs42_set_rw_stateid(&args.falloc_stateid, filep, FMODE_WRITE);
  60         if (status)
  61                 return status;
  62
  63         res.falloc_fattr = nfs_alloc_fattr();
  64         if (!res.falloc_fattr)
  65                 return -ENOMEM;
  66
  67         status = nfs4_call_sync(server->client, server, msg,
  68                                 &args.seq_args, &res.seq_res, 0);
  69         if (status == 0)
  70                 status = nfs_post_op_update_inode(inode, res.falloc_fattr);
  71
  72         kfree(res.falloc_fattr);
  73         return status;
  74 }
  75
  76 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  77                                 loff_t offset, loff_t len)
  78 {
  79         struct nfs_server *server = NFS_SERVER(file_inode(filep));
  80         struct nfs4_exception exception = { };
  81         int err;
  82
  83         do {
  84                 err = _nfs42_proc_fallocate(msg, filep, offset, len);
  85                 if (err == -ENOTSUPP)
  86                         return -EOPNOTSUPP;
  87                 err = nfs4_handle_exception(server, err, &exception);
  88         } while (exception.retry);
  89
  90         return err;
  91 }
  92
  93 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
  94 {
  95         struct rpc_message msg = {
  96                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
  97         };
  98         struct inode *inode = file_inode(filep);
  99         int err;
 100
 101         if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
 102                 return -EOPNOTSUPP;
 103
 104         mutex_lock(&inode->i_mutex);
 105
 106         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 107         if (err == -EOPNOTSUPP)
 108                 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
 109
 110         mutex_unlock(&inode->i_mutex);
 111         return err;
 112 }
 113
 114 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
 115 {
 116         struct rpc_message msg = {
 117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
 118         };
 119         struct inode *inode = file_inode(filep);
 120         int err;
 121
 122         if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
 123                 return -EOPNOTSUPP;
 124
 125         nfs_wb_all(inode);
 126         mutex_lock(&inode->i_mutex);
 127
 128         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 129         if (err == 0)
 130                 truncate_pagecache_range(inode, offset, (offset + len) -1);
 131         if (err == -EOPNOTSUPP)
 132                 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
 133
 134         mutex_unlock(&inode->i_mutex);
 135         return err;
 136 }
 137
 138 static loff_t _nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 139 {
 140         struct inode *inode = file_inode(filep);
 141         struct nfs42_seek_args args = {
 142                 .sa_fh          = NFS_FH(inode),
 143                 .sa_offset      = offset,
 144                 .sa_what        = (whence == SEEK_HOLE) ?
 145                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 146         };
 147         struct nfs42_seek_res res;
 148         struct rpc_message msg = {
 149                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 150                 .rpc_argp = &args,
 151                 .rpc_resp = &res,
 152         };
 153         struct nfs_server *server = NFS_SERVER(inode);
 154         int status;
 155
 156         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 157                 return -ENOTSUPP;
 158
 159         status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
 160         if (status)
 161                 return status;
 162
 163         nfs_wb_all(inode);
 164         status = nfs4_call_sync(server->client, server, &msg,
 165                                 &args.seq_args, &res.seq_res, 0);
 166         if (status == -ENOTSUPP)
 167                 server->caps &= ~NFS_CAP_SEEK;
 168         if (status)
 169                 return status;
 170
 171         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 172 }
 173
 174 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 175 {
 176         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 177         struct nfs4_exception exception = { };
 178         int err;
 179
 180         do {
 181                 err = _nfs42_proc_llseek(filep, offset, whence);
 182                 if (err == -ENOTSUPP)
 183                         return -EOPNOTSUPP;
 184                 err = nfs4_handle_exception(server, err, &exception);
 185         } while (exception.retry);
 186
 187         return err;
 188 }
 189
 190
 191 static void
 192 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 193 {
 194         struct nfs42_layoutstat_data *data = calldata;
 195         struct nfs_server *server = NFS_SERVER(data->args.inode);
 196
 197         nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
 198                              &data->res.seq_res, task);
 199 }
 200
 201 static void
 202 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 203 {
 204         struct nfs42_layoutstat_data *data = calldata;
 205
 206         if (!nfs4_sequence_done(task, &data->res.seq_res))
 207                 return;
 208
 209         switch (task->tk_status) {
 210         case 0:
 211                 break;
 212         case -ENOTSUPP:
 213         case -EOPNOTSUPP:
 214                 NFS_SERVER(data->inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 215         default:
 216                 dprintk("%s server returns %d\n", __func__, task->tk_status);
 217         }
 218 }
 219
 220 static void
 221 nfs42_layoutstat_release(void *calldata)
 222 {
 223         struct nfs42_layoutstat_data *data = calldata;
 224         struct nfs_server *nfss = NFS_SERVER(data->args.inode);
 225
 226         if (nfss->pnfs_curr_ld->cleanup_layoutstats)
 227                 nfss->pnfs_curr_ld->cleanup_layoutstats(data);
 228
 229         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 230         smp_mb__before_atomic();
 231         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 232         smp_mb__after_atomic();
 233         nfs_iput_and_deactive(data->inode);
 234         kfree(data->args.devinfo);
 235         kfree(data);
 236 }
 237
 238 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 239         .rpc_call_prepare = nfs42_layoutstat_prepare,
 240         .rpc_call_done = nfs42_layoutstat_done,
 241         .rpc_release = nfs42_layoutstat_release,
 242 };
 243
 244 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 245                                    struct nfs42_layoutstat_data *data)
 246 {
 247         struct rpc_message msg = {
 248                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 249                 .rpc_argp = &data->args,
 250                 .rpc_resp = &data->res,
 251         };
 252         struct rpc_task_setup task_setup = {
 253                 .rpc_client = server->client,
 254                 .rpc_message = &msg,
 255                 .callback_ops = &nfs42_layoutstat_ops,
 256                 .callback_data = data,
 257                 .flags = RPC_TASK_ASYNC,
 258         };
 259         struct rpc_task *task;
 260
 261         data->inode = nfs_igrab_and_active(data->args.inode);
 262         if (!data->inode) {
 263                 nfs42_layoutstat_release(data);
 264                 return -EAGAIN;
 265         }
 266         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
 267         task = rpc_run_task(&task_setup);
 268         if (IS_ERR(task))
 269                 return PTR_ERR(task);
 270         return 0;
 271 }