fs/nfs/inode.c

/* */
This source file includes following definitions.
nfs_read_inode
nfs_put_inode
nfs_put_super
nfs_read_super
nfs_statfs
nfs_fhget
nfs_notify_change
init_nfs_fs
init_module
cleanup_module
   1 /*
   2  *  linux/fs/nfs/inode.c
   3  *
   4  *  Copyright (C) 1992  Rick Sladkey
   5  *
   6  *  nfs inode and superblock handling functions
   7  *
   8  *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
   9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
  10  *
  11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
  12  *  J.S.Peatfield@damtp.cam.ac.uk
  13  *
  14  */
  15 
  16 #include <linux/module.h>
  17 
  18 #include <linux/sched.h>
  19 #include <linux/nfs_fs.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/string.h>
  23 #include <linux/stat.h>
  24 #include <linux/errno.h>
  25 #include <linux/locks.h>
  26 
  27 #include <asm/system.h>
  28 #include <asm/segment.h>
  29 
  30 extern int close_fp(struct file *filp);
  31 
  32 static int nfs_notify_change(struct inode *, struct iattr *);
  33 static void nfs_put_inode(struct inode *);
  34 static void nfs_put_super(struct super_block *);
  35 static void nfs_read_inode(struct inode *);
  36 static void nfs_statfs(struct super_block *, struct statfs *, int bufsiz);
  37 
  38 static struct super_operations nfs_sops = { 
  39         nfs_read_inode,         /* read inode */
  40         nfs_notify_change,      /* notify change */
  41         NULL,                   /* write inode */
  42         nfs_put_inode,          /* put inode */
  43         nfs_put_super,          /* put superblock */
  44         NULL,                   /* write superblock */
  45         nfs_statfs,             /* stat filesystem */
  46         NULL
  47 };
  48 
  49 /*
  50  * The "read_inode" function doesn't actually do anything:
  51  * the real data is filled in later in nfs_fhget. Here we
  52  * just mark the cache times invalid.
  53  */
  54 static void nfs_read_inode(struct inode * inode)
     /*  */
  55 {
  56         NFS_READTIME(inode) = jiffies - 1000000;
  57         NFS_OLDMTIME(inode) = 0;
  58 }
  59 
  60 static void nfs_put_inode(struct inode * inode)
     /*  */
  61 {
  62 #if 0
  63         clear_inode(inode);
  64 #endif
  65 }
  66 
  67 void nfs_put_super(struct super_block *sb)
     /*  */
  68 {
  69         close_fp(sb->u.nfs_sb.s_server.file);
  70         rpc_closesock(sb->u.nfs_sb.s_server.rsock);
  71         lock_super(sb);
  72         sb->s_dev = 0;
  73         unlock_super(sb);
  74         MOD_DEC_USE_COUNT;
  75 }
  76 
  77 /*
  78  * The way this works is that the mount process passes a structure
  79  * in the data argument which contains an open socket to the NFS
  80  * server and the root file handle obtained from the server's mount
  81  * daemon.  We stash theses away in the private superblock fields.
  82  * Later we can add other mount parameters like caching values.
  83  */
  84 
  85 struct super_block *nfs_read_super(struct super_block *sb, void *raw_data,
     /*  */
  86                                    int silent)
  87 {
  88         struct nfs_mount_data *data = (struct nfs_mount_data *) raw_data;
  89         struct nfs_server *server;
  90         unsigned int fd;
  91         struct file *filp;
  92 
  93         kdev_t dev = sb->s_dev;
  94 
  95         MOD_INC_USE_COUNT;
  96         if (!data) {
  97                 printk("nfs_read_super: missing data argument\n");
  98                 sb->s_dev = 0;
  99                 MOD_DEC_USE_COUNT;
 100                 return NULL;
 101         }
 102         fd = data->fd;
 103         if (data->version != NFS_MOUNT_VERSION) {
 104                 printk("nfs warning: mount version %s than kernel\n",
 105                         data->version < NFS_MOUNT_VERSION ? "older" : "newer");
 106         }
 107         if (fd >= NR_OPEN || !(filp = current->files->fd[fd])) {
 108                 printk("nfs_read_super: invalid file descriptor\n");
 109                 sb->s_dev = 0;
 110                 MOD_DEC_USE_COUNT;
 111                 return NULL;
 112         }
 113         if (!S_ISSOCK(filp->f_inode->i_mode)) {
 114                 printk("nfs_read_super: not a socket\n");
 115                 sb->s_dev = 0;
 116                 MOD_DEC_USE_COUNT;
 117                 return NULL;
 118         }
 119         filp->f_count++;
 120         lock_super(sb);
 121 
 122         sb->s_blocksize = 1024; /* XXX */
 123         sb->s_blocksize_bits = 10;
 124         sb->s_magic = NFS_SUPER_MAGIC;
 125         sb->s_dev = dev;
 126         sb->s_op = &nfs_sops;
 127         server = &sb->u.nfs_sb.s_server;
 128         server->file = filp;
 129         server->lock = 0;
 130         server->wait = NULL;
 131         server->flags = data->flags;
 132         server->rsize = data->rsize;
 133         if (server->rsize <= 0)
 134                 server->rsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
 135         else if (server->rsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
 136                 server->rsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
 137         server->wsize = data->wsize;
 138         if (server->wsize <= 0)
 139                 server->wsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
 140         else if (server->wsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
 141                 server->wsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
 142         server->timeo = data->timeo*HZ/10;
 143         server->retrans = data->retrans;
 144         server->acregmin = data->acregmin*HZ;
 145         server->acregmax = data->acregmax*HZ;
 146         server->acdirmin = data->acdirmin*HZ;
 147         server->acdirmax = data->acdirmax*HZ;
 148         strcpy(server->hostname, data->hostname);
 149 
 150         /* Start of JSP NFS patch */
 151         /* Check if passed address in data->addr */
 152         if (data->addr.sin_addr.s_addr == INADDR_ANY) {  /* No address passed */
 153           if (((struct sockaddr_in *)(&server->toaddr))->sin_addr.s_addr == INADDR_ANY) {
 154             printk("NFS: Error passed unconnected socket and no address\n") ;
 155             MOD_DEC_USE_COUNT;
 156             return NULL ;
 157           } else {
 158             /* Need access to socket internals  JSP */
 159             struct socket *sock;
 160             int dummylen ;
 161 
 162          /*   printk("NFS: using socket address\n") ;*/
 163 
 164             sock = &((filp->f_inode)->u.socket_i);
 165 
 166             /* extract the other end of the socket into server->toaddr */
 167             sock->ops->getname(sock, &(server->toaddr), &dummylen, 1) ;
 168           }
 169         } else {
 170         /*  printk("NFS: coppying passed addr to server->toaddr\n") ;*/
 171           memcpy((char *)&(server->toaddr),(char *)(&data->addr),sizeof(server->toaddr));
 172         }
 173         /* End of JSP NFS patch */
 174 
 175         if ((server->rsock = rpc_makesock(filp)) == NULL) {
 176                 printk("NFS: cannot create RPC socket.\n");
 177                 MOD_DEC_USE_COUNT;
 178                 return NULL;
 179         }
 180 
 181         sb->u.nfs_sb.s_root = data->root;
 182         unlock_super(sb);
 183         if (!(sb->s_mounted = nfs_fhget(sb, &data->root, NULL))) {
 184                 sb->s_dev = 0;
 185                 printk("nfs_read_super: get root inode failed\n");
 186                 MOD_DEC_USE_COUNT;
 187                 return NULL;
 188         }
 189         return sb;
 190 }
 191 
 192 void nfs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
     /*  */
 193 {
 194         int error;
 195         struct nfs_fsinfo res;
 196         struct statfs tmp;
 197 
 198         error = nfs_proc_statfs(&sb->u.nfs_sb.s_server, &sb->u.nfs_sb.s_root,
 199                 &res);
 200         if (error) {
 201                 printk("nfs_statfs: statfs error = %d\n", -error);
 202                 res.bsize = res.blocks = res.bfree = res.bavail = 0;
 203         }
 204         tmp.f_type = NFS_SUPER_MAGIC;
 205         tmp.f_bsize = res.bsize;
 206         tmp.f_blocks = res.blocks;
 207         tmp.f_bfree = res.bfree;
 208         tmp.f_bavail = res.bavail;
 209         tmp.f_files = 0;
 210         tmp.f_ffree = 0;
 211         tmp.f_namelen = NAME_MAX;
 212         memcpy_tofs(buf, &tmp, bufsiz);
 213 }
 214 
 215 /*
 216  * This is our own version of iget that looks up inodes by file handle
 217  * instead of inode number.  We use this technique instead of using
 218  * the vfs read_inode function because there is no way to pass the
 219  * file handle or current attributes into the read_inode function.
 220  * We just have to be careful not to subvert iget's special handling
 221  * of mount points.
 222  */
 223 
 224 struct inode *nfs_fhget(struct super_block *sb, struct nfs_fh *fhandle,
     /*  */
 225                         struct nfs_fattr *fattr)
 226 {
 227         struct nfs_fattr newfattr;
 228         int error;
 229         struct inode *inode;
 230 
 231         if (!sb) {
 232                 printk("nfs_fhget: super block is NULL\n");
 233                 return NULL;
 234         }
 235         if (!fattr) {
 236                 error = nfs_proc_getattr(&sb->u.nfs_sb.s_server, fhandle,
 237                         &newfattr);
 238                 if (error) {
 239                         printk("nfs_fhget: getattr error = %d\n", -error);
 240                         return NULL;
 241                 }
 242                 fattr = &newfattr;
 243         }
 244         if (!(inode = iget(sb, fattr->fileid))) {
 245                 printk("nfs_fhget: iget failed\n");
 246                 return NULL;
 247         }
 248         if (inode->i_dev == sb->s_dev) {
 249                 if (inode->i_ino != fattr->fileid) {
 250                         printk("nfs_fhget: unexpected inode from iget\n");
 251                         return inode;
 252                 }
 253                 *NFS_FH(inode) = *fhandle;
 254                 nfs_refresh_inode(inode, fattr);
 255         }
 256         return inode;
 257 }
 258 
 259 int nfs_notify_change(struct inode *inode, struct iattr *attr)
     /*  */
 260 {
 261         struct nfs_sattr sattr;
 262         struct nfs_fattr fattr;
 263         int error;
 264 
 265         sattr.mode = (unsigned) -1;
 266         if (attr->ia_valid & ATTR_MODE) 
 267                 sattr.mode = attr->ia_mode;
 268 
 269         sattr.uid = (unsigned) -1;
 270         if (attr->ia_valid & ATTR_UID)
 271                 sattr.uid = attr->ia_uid;
 272 
 273         sattr.gid = (unsigned) -1;
 274         if (attr->ia_valid & ATTR_GID)
 275                 sattr.gid = attr->ia_gid;
 276 
 277 
 278         sattr.size = (unsigned) -1;
 279         if (attr->ia_valid & ATTR_SIZE)
 280                 sattr.size = S_ISREG(inode->i_mode) ? attr->ia_size : -1;
 281 
 282         sattr.mtime.seconds = sattr.mtime.useconds = (unsigned) -1;
 283         if (attr->ia_valid & ATTR_MTIME) {
 284                 sattr.mtime.seconds = attr->ia_mtime;
 285                 sattr.mtime.useconds = 0;
 286         }
 287 
 288         sattr.atime.seconds = sattr.atime.useconds = (unsigned) -1;
 289         if (attr->ia_valid & ATTR_ATIME) {
 290                 sattr.atime.seconds = attr->ia_atime;
 291                 sattr.atime.useconds = 0;
 292         }
 293 
 294         error = nfs_proc_setattr(NFS_SERVER(inode), NFS_FH(inode),
 295                 &sattr, &fattr);
 296         if (!error)
 297                 nfs_refresh_inode(inode, &fattr);
 298         inode->i_dirt = 0;
 299         return error;
 300 }
 301 
 302 /* Every kernel module contains stuff like this. */
 303 
 304 static struct file_system_type nfs_fs_type = {
 305         nfs_read_super, "nfs", 0, NULL
 306 };
 307 
 308 int init_nfs_fs(void)
     /*  */
 309 {
 310         return register_filesystem(&nfs_fs_type);
 311 }
 312 
 313 #ifdef MODULE
 314 int init_module(void)
     /*  */
 315 {
 316         int status;
 317 
 318         if ((status = init_nfs_fs()) == 0)
 319                 register_symtab(0);
 320         return status;
 321 }
 322 
 323 void cleanup_module(void)
     /*  */
 324 {
 325         unregister_filesystem(&nfs_fs_type);
 326         nfs_kfree_cache();
 327 }
 328 
 329 #endif
/* */
root/fs/nfs/inode.c

DEFINITIONS
