fs/nfs/proc.c

   1 /*
   2  *  linux/fs/nfs/proc.c
   3  *
   4  *  Copyright (C) 1992, 1993, 1994  Rick Sladkey
   5  *
   6  *  OS-independent nfs remote procedure call functions
   7  *
   8  *  Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
   9  *  so at last we can have decent(ish) throughput off a
  10  *  Sun server.
  11  *
  12  *  Coding optimized and cleaned up by Florian La Roche.
  13  *  Note: Error returns are optimized for NFS_OK, which isn't translated via
  14  *  nfs_stat_to_errno(), but happens to be already the right return code.
  15  *
  16  *  Also, the code currently doesn't check the size of the packet, when
  17  *  it decodes the packet.
  18  *
  19  *  Feel free to fix it and mail me the diffs if it worries you.
  20  *
  21  *  Completely rewritten to support the new RPC call interface;
  22  *  rewrote and moved the entire XDR stuff to xdr.c
  23  *  --Olaf Kirch June 1996
  24  *
  25  *  The code below initializes all auto variables explicitly, otherwise
  26  *  it will fail to work as a module (gcc generates a memset call for an
  27  *  incomplete struct).
  28  */
  29
  30 #include <linux/types.h>
  31 #include <linux/param.h>
  32 #include <linux/malloc.h>
  33 #include <linux/sched.h>
  34 #include <linux/mm.h>
  35 #include <linux/utsname.h>
  36 #include <linux/errno.h>
  37 #include <linux/string.h>
  38 #include <linux/in.h>
  39 #include <linux/pagemap.h>
  40 #include <linux/sunrpc/clnt.h>
  41 #include <linux/nfs.h>
  42 #include <linux/nfs2.h>
  43 #include <linux/nfs_fs.h>
  44
  45 #define NFSDBG_FACILITY         NFSDBG_PROC
  46
  47 /*
  48  * Bare-bones access to getattr: this is for nfs_read_super.
  49  */
  50 static int
  51 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  52                   struct nfs_fattr *fattr)
  53 {
  54         int             status;
  55
  56         dprintk("NFS call  getroot\n");
  57         fattr->valid = 0;
  58         status = rpc_call(server->client, NFSPROC_GETATTR, fhandle, fattr, 0);
  59         dprintk("NFS reply getroot\n");
  60         return status;
  61 }
  62
  63 /*
  64  * One function for each procedure in the NFS protocol.
  65  */
  66 static int
  67 nfs_proc_getattr(struct dentry *dentry, struct nfs_fattr *fattr)
  68 {
  69         int     status;
  70
  71         dprintk("NFS call  getattr\n");
  72         fattr->valid = 0;
  73         status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_GETATTR,
  74                                 NFS_FH(dentry), fattr, 0);
  75         dprintk("NFS reply getattr\n");
  76         return status;
  77 }
  78
  79 static int
  80 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
  81                  struct iattr *sattr)
  82 {
  83         struct nfs_sattrargs    arg = { NFS_FH(dentry), sattr };
  84         int     status;
  85
  86         dprintk("NFS call  setattr\n");
  87         fattr->valid = 0;
  88         status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_SETATTR, &arg, fattr, 0);
  89         dprintk("NFS reply setattr\n");
  90         return status;
  91 }
  92
  93 static int
  94 nfs_proc_lookup(struct dentry *dir, struct qstr *name,
  95                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
  96 {
  97         struct nfs_diropargs    arg = { NFS_FH(dir), name->name, name->len };
  98         struct nfs_diropok      res = { fhandle, fattr };
  99         int                     status;
 100
 101         dprintk("NFS call  lookup %s\n", name->name);
 102         fattr->valid = 0;
 103         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_LOOKUP, &arg, &res, 0);
 104         dprintk("NFS reply lookup: %d\n", status);
 105         return status;
 106 }
 107
 108 static int
 109 nfs_proc_readlink(struct dentry *dentry, void *buffer, unsigned int bufsiz)
 110 {
 111         struct nfs_readlinkargs args = { NFS_FH(dentry), buffer, bufsiz };
 112         struct nfs_readlinkres  res = { buffer, bufsiz };
 113         int                     status;
 114
 115         dprintk("NFS call  readlink\n");
 116         status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_READLINK,
 117                                         &args, &res, 0);
 118         dprintk("NFS reply readlink: %d\n", status);
 119         return status;
 120 }
 121
 122 static int
 123 nfs_proc_read(struct file *file, struct nfs_fattr *fattr, int flags,
 124               loff_t offset, unsigned int count, void *buffer, int *eofp)
 125 {
 126         struct dentry           *dentry = file->f_dentry;
 127         struct rpc_cred         *cred = nfs_file_cred(file);
 128         struct nfs_readargs     arg = { NFS_FH(dentry), offset, count, 1,
 129                                        {{ buffer, count }, {0,0}, {0,0}, {0,0},
 130                                         {0,0}, {0,0}, {0,0}, {0,0}} };
 131         struct nfs_readres      res = { fattr, count, 0};
 132         struct rpc_message      msg = { NFSPROC_READ, &arg, &res, cred };
 133         int                     status;
 134
 135         dprintk("NFS call  read %d @ %Ld\n", count, (long long)offset);
 136         fattr->valid = 0;
 137         status = rpc_call_sync(NFS_CLIENT(dentry->d_inode), &msg, flags);
 138
 139         dprintk("NFS reply read: %d\n", status);
 140         *eofp = res.eof;
 141         return status;
 142 }
 143
 144 static int
 145 nfs_proc_write(struct file *file, struct nfs_fattr *fattr, int how,
 146                loff_t offset, unsigned int count,
 147                void *buffer, struct nfs_writeverf *verf)
 148 {
 149         struct dentry           *dentry = file->f_dentry;
 150         struct rpc_cred         *cred = nfs_file_cred(file);
 151         struct nfs_writeargs    arg = {NFS_FH(dentry), offset, count,
 152                                         NFS_FILE_SYNC, 1,
 153                                         {{buffer, count}, {0,0}, {0,0}, {0,0},
 154                                          {0,0}, {0,0}, {0,0}, {0,0}}};
 155         struct nfs_writeres     res = {fattr, verf, count};
 156         struct rpc_message      msg = { NFSPROC_WRITE, &arg, &res, cred };
 157         int                     status, flags = 0;
 158
 159         dprintk("NFS call  write %d @ %Ld\n", count, (long long)offset);
 160         fattr->valid = 0;
 161         if (how & NFS_RW_SWAP)
 162                 flags |= NFS_RPC_SWAPFLAGS;
 163         status = rpc_call_sync(NFS_CLIENT(dentry->d_inode), &msg, flags);
 164
 165         dprintk("NFS reply write: %d\n", status);
 166         verf->committed = NFS_FILE_SYNC;      /* NFSv2 always syncs data */
 167         return status < 0? status : count;
 168 }
 169
 170 static int
 171 nfs_proc_create(struct dentry *dir, struct qstr *name, struct iattr *sattr,
 172                 int flags, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 173 {
 174         struct nfs_createargs   arg = { NFS_FH(dir), name->name,
 175                                         name->len, sattr };
 176         struct nfs_diropok      res = { fhandle, fattr };
 177         int                     status;
 178
 179         fattr->valid = 0;
 180         dprintk("NFS call  create %s\n", name->name);
 181         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_CREATE, &arg, &res, 0);
 182         dprintk("NFS reply create: %d\n", status);
 183         return status;
 184 }
 185
 186 /*
 187  * In NFSv2, mknod is grafted onto the create call.
 188  */
 189 static int
 190 nfs_proc_mknod(struct dentry *dir, struct qstr *name, struct iattr *sattr,
 191                dev_t rdev, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 192 {
 193         struct nfs_createargs   arg = { NFS_FH(dir), name->name,
 194                                                      name->len, sattr };
 195         struct nfs_diropok      res = { fhandle, fattr };
 196         int                     status, mode;
 197
 198         dprintk("NFS call  mknod %s\n", name->name);
 199
 200         mode = sattr->ia_mode;
 201         if (S_ISFIFO(mode)) {
 202                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 203                 sattr->ia_valid &= ~ATTR_SIZE;
 204         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 205                 sattr->ia_valid |= ATTR_SIZE;
 206                 sattr->ia_size   = rdev;        /* get out your barf bag */
 207         }
 208
 209         fattr->valid = 0;
 210         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_CREATE, &arg, &res, 0);
 211
 212         if (status == -EINVAL && S_ISFIFO(mode)) {
 213                 sattr->ia_mode = mode;
 214                 fattr->valid = 0;
 215                 status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_CREATE, &arg, &res, 0);
 216         }
 217         dprintk("NFS reply mknod: %d\n", status);
 218         return status;
 219 }
 220
 221 static int
 222 nfs_proc_remove(struct dentry *dir, struct qstr *name)
 223 {
 224         struct nfs_diropargs    arg = { NFS_FH(dir), name->name, name->len };
 225         struct rpc_message      msg = { NFSPROC_REMOVE, &arg, NULL, NULL };
 226         int                     status;
 227
 228         dprintk("NFS call  remove %s\n", name->name);
 229         status = rpc_call_sync(NFS_CLIENT(dir->d_inode), &msg, 0);
 230
 231         dprintk("NFS reply remove: %d\n", status);
 232         return status;
 233 }
 234
 235 static int
 236 nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
 237 {
 238         struct nfs_diropargs    *arg;
 239
 240         arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL);
 241         if (!arg)
 242                 return -ENOMEM;
 243         arg->fh = NFS_FH(dir);
 244         arg->name = name->name;
 245         arg->len = name->len;
 246         msg->rpc_proc = NFSPROC_REMOVE;
 247         msg->rpc_argp = arg;
 248         return 0;
 249 }
 250
 251 static void
 252 nfs_proc_unlink_done(struct dentry *dir, struct rpc_message *msg)
 253 {
 254         NFS_CACHEINV(dir->d_inode);
 255         kfree(msg->rpc_argp);
 256 }
 257
 258 static int
 259 nfs_proc_rename(struct dentry *old_dir, struct qstr *old_name,
 260                 struct dentry *new_dir, struct qstr *new_name)
 261 {
 262         struct nfs_renameargs   arg = { NFS_FH(old_dir), old_name->name,
 263                                         old_name->len,
 264                                         NFS_FH(new_dir), new_name->name,
 265                                         new_name->len};
 266         int                     status;
 267
 268         dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 269         status = rpc_call(NFS_CLIENT(old_dir->d_inode), NFSPROC_RENAME, &arg, NULL, 0);
 270         dprintk("NFS reply rename: %d\n", status);
 271         return status;
 272 }
 273
 274 static int
 275 nfs_proc_link(struct dentry *dentry, struct dentry *dir, struct qstr *name)
 276 {
 277         struct nfs_linkargs     arg = { NFS_FH(dentry), NFS_FH(dir),
 278                                         name->name, name->len };
 279         int                     status;
 280
 281         dprintk("NFS call  link %s\n", name->name);
 282         status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_LINK, &arg, NULL, 0);
 283         dprintk("NFS reply link: %d\n", status);
 284         return status;
 285 }
 286
 287 static int
 288 nfs_proc_symlink(struct dentry *dir, struct qstr *name, struct qstr *path,
 289                  struct iattr *sattr, struct nfs_fh *fhandle,
 290                  struct nfs_fattr *fattr)
 291 {
 292         struct nfs_symlinkargs  arg = { NFS_FH(dir), name->name, name->len,
 293                                         path->name, path->len, sattr };
 294         int                     status;
 295
 296         dprintk("NFS call  symlink %s -> %s\n", name->name, path->name);
 297         fattr->valid = 0;
 298         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_SYMLINK, &arg, NULL, 0);
 299         dprintk("NFS reply symlink: %d\n", status);
 300         return status;
 301 }
 302
 303 static int
 304 nfs_proc_mkdir(struct dentry *dir, struct qstr *name, struct iattr *sattr,
 305                struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 306 {
 307         struct nfs_createargs   arg = { NFS_FH(dir), name->name, name->len,
 308                                         sattr };
 309         struct nfs_diropok      res = { fhandle, fattr };
 310         int                     status;
 311
 312         dprintk("NFS call  mkdir %s\n", name->name);
 313         fattr->valid = 0;
 314         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_MKDIR, &arg, &res, 0);
 315         dprintk("NFS reply mkdir: %d\n", status);
 316         return status;
 317 }
 318
 319 static int
 320 nfs_proc_rmdir(struct dentry *dir, struct qstr *name)
 321 {
 322         struct nfs_diropargs    arg = { NFS_FH(dir), name->name, name->len };
 323         int                     status;
 324
 325         dprintk("NFS call  rmdir %s\n", name->name);
 326         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_RMDIR, &arg, NULL, 0);
 327         dprintk("NFS reply rmdir: %d\n", status);
 328         return status;
 329 }
 330
 331 /*
 332  * The READDIR implementation is somewhat hackish - we pass a temporary
 333  * buffer to the encode function, which installs it in the receive
 334  * the receive iovec. The decode function just parses the reply to make
 335  * sure it is syntactically correct; the entries itself are decoded
 336  * from nfs_readdir by calling the decode_entry function directly.
 337  */
 338 static int
 339 nfs_proc_readdir(struct file *file, __u64 cookie, void *entry,
 340                  unsigned int size, int plus)
 341 {
 342         struct dentry           *dir = file->f_dentry;
 343         struct rpc_cred         *cred = nfs_file_cred(file);
 344         struct nfs_readdirargs  arg;
 345         struct nfs_readdirres   res;
 346         struct rpc_message      msg = { NFSPROC_READDIR, &arg, &res, cred };
 347         int                     status;
 348
 349         arg.fh = NFS_FH(dir);
 350         arg.cookie = cookie;
 351         arg.buffer = entry;
 352         arg.bufsiz = size;
 353         res.buffer = entry;
 354         res.bufsiz = size;
 355
 356         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 357         status = rpc_call_sync(NFS_CLIENT(dir->d_inode), &msg, 0);
 358
 359         dprintk("NFS reply readdir: %d\n", status);
 360         return status;
 361 }
 362
 363 static int
 364 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 365                         struct nfs_fsinfo *info)
 366 {
 367         int     status;
 368
 369         dprintk("NFS call  statfs\n");
 370         memset((char *)info, 0, sizeof(*info));
 371         status = rpc_call(server->client, NFSPROC_STATFS, fhandle, info, 0);
 372         dprintk("NFS reply statfs: %d\n", status);
 373         return status;
 374 }
 375
 376 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
 377
 378 struct nfs_rpc_ops     nfs_v2_clientops = {
 379        2,                      /* protocol version */
 380        nfs_proc_get_root,
 381        nfs_proc_getattr,
 382        nfs_proc_setattr,
 383        nfs_proc_lookup,
 384        NULL,                   /* access */
 385        nfs_proc_readlink,
 386        nfs_proc_read,
 387        nfs_proc_write,
 388        NULL,                   /* commit */
 389        nfs_proc_create,
 390        nfs_proc_remove,
 391        nfs_proc_unlink_setup,
 392        nfs_proc_unlink_done,
 393        nfs_proc_rename,
 394        nfs_proc_link,
 395        nfs_proc_symlink,
 396        nfs_proc_mkdir,
 397        nfs_proc_rmdir,
 398        nfs_proc_readdir,
 399        nfs_proc_mknod,
 400        nfs_proc_statfs,
 401        nfs_decode_dirent,
 402 };