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_PROC
  18
  19 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  20                 struct nfs_lock_context *lock, loff_t offset, loff_t len)
  21 {
  22         struct inode *inode = file_inode(filep);
  23         struct nfs_server *server = NFS_SERVER(inode);
  24         struct nfs42_falloc_args args = {
  25                 .falloc_fh      = NFS_FH(inode),
  26                 .falloc_offset  = offset,
  27                 .falloc_length  = len,
  28                 .falloc_bitmask = server->cache_consistency_bitmask,
  29         };
  30         struct nfs42_falloc_res res = {
  31                 .falloc_server  = server,
  32         };
  33         int status;
  34
  35         msg->rpc_argp = &args;
  36         msg->rpc_resp = &res;
  37
  38         status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
  39                         lock, FMODE_WRITE);
  40         if (status)
  41                 return status;
  42
  43         res.falloc_fattr = nfs_alloc_fattr();
  44         if (!res.falloc_fattr)
  45                 return -ENOMEM;
  46
  47         status = nfs4_call_sync(server->client, server, msg,
  48                                 &args.seq_args, &res.seq_res, 0);
  49         if (status == 0)
  50                 status = nfs_post_op_update_inode(inode, res.falloc_fattr);
  51
  52         kfree(res.falloc_fattr);
  53         return status;
  54 }
  55
  56 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  57                                 loff_t offset, loff_t len)
  58 {
  59         struct nfs_server *server = NFS_SERVER(file_inode(filep));
  60         struct nfs4_exception exception = { };
  61         struct nfs_lock_context *lock;
  62         int err;
  63
  64         lock = nfs_get_lock_context(nfs_file_open_context(filep));
  65         if (IS_ERR(lock))
  66                 return PTR_ERR(lock);
  67
  68         exception.inode = file_inode(filep);
  69         exception.state = lock->open_context->state;
  70
  71         do {
  72                 err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
  73                 if (err == -ENOTSUPP) {
  74                         err = -EOPNOTSUPP;
  75                         break;
  76                 }
  77                 err = nfs4_handle_exception(server, err, &exception);
  78         } while (exception.retry);
  79
  80         nfs_put_lock_context(lock);
  81         return err;
  82 }
  83
  84 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
  85 {
  86         struct rpc_message msg = {
  87                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
  88         };
  89         struct inode *inode = file_inode(filep);
  90         int err;
  91
  92         if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
  93                 return -EOPNOTSUPP;
  94
  95         inode_lock(inode);
  96
  97         err = nfs42_proc_fallocate(&msg, filep, offset, len);
  98         if (err == -EOPNOTSUPP)
  99                 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
 100
 101         inode_unlock(inode);
 102         return err;
 103 }
 104
 105 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
 106 {
 107         struct rpc_message msg = {
 108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
 109         };
 110         struct inode *inode = file_inode(filep);
 111         int err;
 112
 113         if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
 114                 return -EOPNOTSUPP;
 115
 116         nfs_wb_all(inode);
 117         inode_lock(inode);
 118
 119         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 120         if (err == 0)
 121                 truncate_pagecache_range(inode, offset, (offset + len) -1);
 122         if (err == -EOPNOTSUPP)
 123                 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
 124
 125         inode_unlock(inode);
 126         return err;
 127 }
 128
 129 static loff_t _nfs42_proc_llseek(struct file *filep,
 130                 struct nfs_lock_context *lock, loff_t offset, int whence)
 131 {
 132         struct inode *inode = file_inode(filep);
 133         struct nfs42_seek_args args = {
 134                 .sa_fh          = NFS_FH(inode),
 135                 .sa_offset      = offset,
 136                 .sa_what        = (whence == SEEK_HOLE) ?
 137                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 138         };
 139         struct nfs42_seek_res res;
 140         struct rpc_message msg = {
 141                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 142                 .rpc_argp = &args,
 143                 .rpc_resp = &res,
 144         };
 145         struct nfs_server *server = NFS_SERVER(inode);
 146         int status;
 147
 148         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 149                 return -ENOTSUPP;
 150
 151         status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 152                         lock, FMODE_READ);
 153         if (status)
 154                 return status;
 155
 156         nfs_wb_all(inode);
 157         status = nfs4_call_sync(server->client, server, &msg,
 158                                 &args.seq_args, &res.seq_res, 0);
 159         if (status == -ENOTSUPP)
 160                 server->caps &= ~NFS_CAP_SEEK;
 161         if (status)
 162                 return status;
 163
 164         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 165 }
 166
 167 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 168 {
 169         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 170         struct nfs4_exception exception = { };
 171         struct nfs_lock_context *lock;
 172         loff_t err;
 173
 174         lock = nfs_get_lock_context(nfs_file_open_context(filep));
 175         if (IS_ERR(lock))
 176                 return PTR_ERR(lock);
 177
 178         exception.inode = file_inode(filep);
 179         exception.state = lock->open_context->state;
 180
 181         do {
 182                 err = _nfs42_proc_llseek(filep, lock, offset, whence);
 183                 if (err >= 0)
 184                         break;
 185                 if (err == -ENOTSUPP) {
 186                         err = -EOPNOTSUPP;
 187                         break;
 188                 }
 189                 err = nfs4_handle_exception(server, err, &exception);
 190         } while (exception.retry);
 191
 192         nfs_put_lock_context(lock);
 193         return err;
 194 }
 195
 196
 197 static void
 198 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 199 {
 200         struct nfs42_layoutstat_data *data = calldata;
 201         struct nfs_server *server = NFS_SERVER(data->args.inode);
 202
 203         nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
 204                              &data->res.seq_res, task);
 205 }
 206
 207 static void
 208 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 209 {
 210         struct nfs42_layoutstat_data *data = calldata;
 211         struct inode *inode = data->inode;
 212         struct pnfs_layout_hdr *lo;
 213
 214         if (!nfs4_sequence_done(task, &data->res.seq_res))
 215                 return;
 216
 217         switch (task->tk_status) {
 218         case 0:
 219                 break;
 220         case -NFS4ERR_EXPIRED:
 221         case -NFS4ERR_STALE_STATEID:
 222         case -NFS4ERR_OLD_STATEID:
 223         case -NFS4ERR_BAD_STATEID:
 224                 spin_lock(&inode->i_lock);
 225                 lo = NFS_I(inode)->layout;
 226                 if (lo && nfs4_stateid_match(&data->args.stateid,
 227                                              &lo->plh_stateid)) {
 228                         LIST_HEAD(head);
 229
 230                         /*
 231                          * Mark the bad layout state as invalid, then retry
 232                          * with the current stateid.
 233                          */
 234                         set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 235                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
 236                         spin_unlock(&inode->i_lock);
 237                         pnfs_free_lseg_list(&head);
 238                 } else
 239                         spin_unlock(&inode->i_lock);
 240                 break;
 241         case -ENOTSUPP:
 242         case -EOPNOTSUPP:
 243                 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 244         default:
 245                 break;
 246         }
 247
 248         dprintk("%s server returns %d\n", __func__, task->tk_status);
 249 }
 250
 251 static void
 252 nfs42_layoutstat_release(void *calldata)
 253 {
 254         struct nfs42_layoutstat_data *data = calldata;
 255         struct nfs_server *nfss = NFS_SERVER(data->args.inode);
 256
 257         if (nfss->pnfs_curr_ld->cleanup_layoutstats)
 258                 nfss->pnfs_curr_ld->cleanup_layoutstats(data);
 259
 260         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 261         smp_mb__before_atomic();
 262         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 263         smp_mb__after_atomic();
 264         nfs_iput_and_deactive(data->inode);
 265         kfree(data->args.devinfo);
 266         kfree(data);
 267 }
 268
 269 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 270         .rpc_call_prepare = nfs42_layoutstat_prepare,
 271         .rpc_call_done = nfs42_layoutstat_done,
 272         .rpc_release = nfs42_layoutstat_release,
 273 };
 274
 275 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 276                                    struct nfs42_layoutstat_data *data)
 277 {
 278         struct rpc_message msg = {
 279                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 280                 .rpc_argp = &data->args,
 281                 .rpc_resp = &data->res,
 282         };
 283         struct rpc_task_setup task_setup = {
 284                 .rpc_client = server->client,
 285                 .rpc_message = &msg,
 286                 .callback_ops = &nfs42_layoutstat_ops,
 287                 .callback_data = data,
 288                 .flags = RPC_TASK_ASYNC,
 289         };
 290         struct rpc_task *task;
 291
 292         data->inode = nfs_igrab_and_active(data->args.inode);
 293         if (!data->inode) {
 294                 nfs42_layoutstat_release(data);
 295                 return -EAGAIN;
 296         }
 297         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
 298         task = rpc_run_task(&task_setup);
 299         if (IS_ERR(task))
 300                 return PTR_ERR(task);
 301         return 0;
 302 }
 303
 304 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 305                 struct file *dst_f, struct nfs_lock_context *src_lock,
 306                 struct nfs_lock_context *dst_lock, loff_t src_offset,
 307                 loff_t dst_offset, loff_t count)
 308 {
 309         struct inode *src_inode = file_inode(src_f);
 310         struct inode *dst_inode = file_inode(dst_f);
 311         struct nfs_server *server = NFS_SERVER(dst_inode);
 312         struct nfs42_clone_args args = {
 313                 .src_fh = NFS_FH(src_inode),
 314                 .dst_fh = NFS_FH(dst_inode),
 315                 .src_offset = src_offset,
 316                 .dst_offset = dst_offset,
 317                 .count = count,
 318                 .dst_bitmask = server->cache_consistency_bitmask,
 319         };
 320         struct nfs42_clone_res res = {
 321                 .server = server,
 322         };
 323         int status;
 324
 325         msg->rpc_argp = &args;
 326         msg->rpc_resp = &res;
 327
 328         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 329                         src_lock, FMODE_READ);
 330         if (status)
 331                 return status;
 332
 333         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 334                         dst_lock, FMODE_WRITE);
 335         if (status)
 336                 return status;
 337
 338         res.dst_fattr = nfs_alloc_fattr();
 339         if (!res.dst_fattr)
 340                 return -ENOMEM;
 341
 342         status = nfs4_call_sync(server->client, server, msg,
 343                                 &args.seq_args, &res.seq_res, 0);
 344         if (status == 0)
 345                 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 346
 347         kfree(res.dst_fattr);
 348         return status;
 349 }
 350
 351 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
 352                      loff_t src_offset, loff_t dst_offset, loff_t count)
 353 {
 354         struct rpc_message msg = {
 355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
 356         };
 357         struct inode *inode = file_inode(src_f);
 358         struct nfs_server *server = NFS_SERVER(file_inode(src_f));
 359         struct nfs_lock_context *src_lock;
 360         struct nfs_lock_context *dst_lock;
 361         struct nfs4_exception src_exception = { };
 362         struct nfs4_exception dst_exception = { };
 363         int err, err2;
 364
 365         if (!nfs_server_capable(inode, NFS_CAP_CLONE))
 366                 return -EOPNOTSUPP;
 367
 368         src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
 369         if (IS_ERR(src_lock))
 370                 return PTR_ERR(src_lock);
 371
 372         src_exception.inode = file_inode(src_f);
 373         src_exception.state = src_lock->open_context->state;
 374
 375         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
 376         if (IS_ERR(dst_lock)) {
 377                 err = PTR_ERR(dst_lock);
 378                 goto out_put_src_lock;
 379         }
 380
 381         dst_exception.inode = file_inode(dst_f);
 382         dst_exception.state = dst_lock->open_context->state;
 383
 384         do {
 385                 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
 386                                         src_offset, dst_offset, count);
 387                 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
 388                         NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
 389                         err = -EOPNOTSUPP;
 390                         break;
 391                 }
 392
 393                 err2 = nfs4_handle_exception(server, err, &src_exception);
 394                 err = nfs4_handle_exception(server, err, &dst_exception);
 395                 if (!err)
 396                         err = err2;
 397         } while (src_exception.retry || dst_exception.retry);
 398
 399         nfs_put_lock_context(dst_lock);
 400 out_put_src_lock:
 401         nfs_put_lock_context(src_lock);
 402         return err;
 403 }