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_rename(struct dentry *old_dir, struct qstr *old_name,
 237                 struct dentry *new_dir, struct qstr *new_name)
 238 {
 239         struct nfs_renameargs   arg = { NFS_FH(old_dir), old_name->name,
 240                                         old_name->len,
 241                                         NFS_FH(new_dir), new_name->name,
 242                                         new_name->len};
 243         int                     status;
 244
 245         dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 246         status = rpc_call(NFS_CLIENT(old_dir->d_inode), NFSPROC_RENAME, &arg, NULL, 0);
 247         dprintk("NFS reply rename: %d\n", status);
 248         return status;
 249 }
 250
 251 static int
 252 nfs_proc_link(struct dentry *dentry, struct dentry *dir, struct qstr *name)
 253 {
 254         struct nfs_linkargs     arg = { NFS_FH(dentry), NFS_FH(dir),
 255                                         name->name, name->len };
 256         int                     status;
 257
 258         dprintk("NFS call  link %s\n", name->name);
 259         status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_LINK, &arg, NULL, 0);
 260         dprintk("NFS reply link: %d\n", status);
 261         return status;
 262 }
 263
 264 static int
 265 nfs_proc_symlink(struct dentry *dir, struct qstr *name, struct qstr *path,
 266                  struct iattr *sattr, struct nfs_fh *fhandle,
 267                  struct nfs_fattr *fattr)
 268 {
 269         struct nfs_symlinkargs  arg = { NFS_FH(dir), name->name, name->len,
 270                                         path->name, path->len, sattr };
 271         int                     status;
 272
 273         dprintk("NFS call  symlink %s -> %s\n", name->name, path->name);
 274         fattr->valid = 0;
 275         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_SYMLINK, &arg, NULL, 0);
 276         dprintk("NFS reply symlink: %d\n", status);
 277         return status;
 278 }
 279
 280 static int
 281 nfs_proc_mkdir(struct dentry *dir, struct qstr *name, struct iattr *sattr,
 282                struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 283 {
 284         struct nfs_createargs   arg = { NFS_FH(dir), name->name, name->len,
 285                                         sattr };
 286         struct nfs_diropok      res = { fhandle, fattr };
 287         int                     status;
 288
 289         dprintk("NFS call  mkdir %s\n", name->name);
 290         fattr->valid = 0;
 291         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_MKDIR, &arg, &res, 0);
 292         dprintk("NFS reply mkdir: %d\n", status);
 293         return status;
 294 }
 295
 296 static int
 297 nfs_proc_rmdir(struct dentry *dir, struct qstr *name)
 298 {
 299         struct nfs_diropargs    arg = { NFS_FH(dir), name->name, name->len };
 300         int                     status;
 301
 302         dprintk("NFS call  rmdir %s\n", name->name);
 303         status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_RMDIR, &arg, NULL, 0);
 304         dprintk("NFS reply rmdir: %d\n", status);
 305         return status;
 306 }
 307
 308 /*
 309  * The READDIR implementation is somewhat hackish - we pass a temporary
 310  * buffer to the encode function, which installs it in the receive
 311  * the receive iovec. The decode function just parses the reply to make
 312  * sure it is syntactically correct; the entries itself are decoded
 313  * from nfs_readdir by calling the decode_entry function directly.
 314  */
 315 static int
 316 nfs_proc_readdir(struct file *file, __u64 cookie, void *entry,
 317                  unsigned int size, int plus)
 318 {
 319         struct dentry           *dir = file->f_dentry;
 320         struct rpc_cred         *cred = nfs_file_cred(file);
 321         struct nfs_readdirargs  arg;
 322         struct nfs_readdirres   res;
 323         struct rpc_message      msg = { NFSPROC_READDIR, &arg, &res, cred };
 324         struct nfs_server       *server = NFS_DSERVER(dir);
 325         int                     status;
 326
 327         if (server->rsize < size)
 328                 size = server->rsize;
 329
 330         arg.fh = NFS_FH(dir);
 331         arg.cookie = cookie;
 332         arg.buffer = entry;
 333         arg.bufsiz = size;
 334         res.buffer = entry;
 335         res.bufsiz = size;
 336
 337         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 338         status = rpc_call_sync(NFS_CLIENT(dir->d_inode), &msg, 0);
 339
 340         dprintk("NFS reply readdir: %d\n", status);
 341         return status;
 342 }
 343
 344 static int
 345 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 346                         struct nfs_fsinfo *info)
 347 {
 348         int     status;
 349
 350         dprintk("NFS call  statfs\n");
 351         memset((char *)info, 0, sizeof(*info));
 352         status = rpc_call(server->client, NFSPROC_STATFS, fhandle, info, 0);
 353         dprintk("NFS reply statfs: %d\n", status);
 354         return status;
 355 }
 356
 357 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
 358
 359 struct nfs_rpc_ops     nfs_v2_clientops = {
 360        2,                      /* protocol version */
 361        nfs_proc_get_root,
 362        nfs_proc_getattr,
 363        nfs_proc_setattr,
 364        nfs_proc_lookup,
 365        NULL,                   /* access */
 366        nfs_proc_readlink,
 367        nfs_proc_read,
 368        nfs_proc_write,
 369        NULL,                   /* commit */
 370        nfs_proc_create,
 371        nfs_proc_remove,
 372        nfs_proc_rename,
 373        nfs_proc_link,
 374        nfs_proc_symlink,
 375        nfs_proc_mkdir,
 376        nfs_proc_rmdir,
 377        nfs_proc_readdir,
 378        nfs_proc_mknod,
 379        nfs_proc_statfs,
 380        nfs_decode_dirent,
 381 };