lustre/obdfs/super.c

   1 /*
   2  * OBDFS Super operations
   3  *
   4  * Copryright (C) 1996 Peter J. Braam <braam@stelias.com>
   5  * Copryright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
   6  * Copryright (C) 1999 Seagate Technology Inc.
   7  *
   8  */
   9
  10 #define EXPORT_SYMTAB
  11
  12 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mm.h>
  16 #include <linux/string.h>
  17 #include <linux/stat.h>
  18 #include <linux/errno.h>
  19 #include <linux/locks.h>
  20 #include <linux/unistd.h>
  21
  22 #include <asm/system.h>
  23 #include <asm/uaccess.h>
  24
  25 #include <linux/fs.h>
  26 #include <linux/stat.h>
  27 #include <asm/uaccess.h>
  28 #include <linux/vmalloc.h>
  29 #include <asm/segment.h>
  30
  31 #include <linux/obd_support.h>
  32 #include <linux/obd_class.h>
  33 #include <linux/obd_sim.h>  /* XXX for development/debugging only */
  34 #include <obdfs.h>
  35
  36 /* VFS super_block ops */
  37 static struct super_block *obdfs_read_super(struct super_block *, void *, int);
  38 static int  obdfs_notify_change(struct dentry *dentry, struct iattr *attr);
  39 static void obdfs_write_inode(struct inode *);
  40 static void obdfs_delete_inode(struct inode *);
  41 static void obdfs_put_super(struct super_block *);
  42 static int obdfs_statfs(struct super_block *sb, struct statfs *buf,
  43                        int bufsiz);
  44
  45 /* exported operations */
  46 struct super_operations obdfs_super_operations =
  47 {
  48         obdfs_read_inode,       /* read_inode */
  49         obdfs_write_inode,      /* write_inode */
  50         NULL,                   /* put_inode */
  51         obdfs_delete_inode,     /* delete_inode */
  52         obdfs_notify_change,    /* notify_change */
  53         obdfs_put_super,        /* put_super */
  54         NULL,                   /* write_super */
  55         obdfs_statfs,           /* statfs */
  56         NULL                    /* remount_fs */
  57 };
  58
  59 struct obdfs_sb_info obdfs_super_info;
  60 int obd_minor = 0;
  61 int obd_root_ino = 2;
  62
  63 static struct super_block * obdfs_read_super(struct super_block *sb,
  64                                             void *data, int silent)
  65 {
  66         struct inode *root = 0;
  67         struct obdfs_sb_info *sbi = NULL;
  68         struct obd_device *obddev;
  69         int error = 0;
  70         unsigned long blocksize;
  71         unsigned long blocksize_bits;
  72         unsigned long root_ino;
  73         int scratch;
  74
  75
  76         ENTRY;
  77         MOD_INC_USE_COUNT;
  78
  79         sbi = &obdfs_super_info;
  80
  81         if ( sbi->osi_super ) {
  82                 printk("Already mounted\n");
  83                 MOD_DEC_USE_COUNT;
  84                 return NULL;
  85         }
  86
  87         obddev = &obd_dev[obd_minor];
  88
  89         if ( ! (obddev->obd_flags & OBD_ATTACHED) ||
  90              ! (obddev->obd_flags & OBD_SET_UP) )
  91                 return NULL;
  92
  93         sbi->osi_obd = obddev;
  94         sbi->osi_ops = sbi->osi_obd->obd_type->typ_ops;
  95
  96         error  = sbi->osi_ops->o_connect(sbi->osi_obd, &sbi->osi_conn_info);
  97         if ( error ) {
  98                 printk("OBDFS: cannot connect to 0x%x.\n", obd_minor);
  99                 goto error;
 100         }
 101
 102         sbi->osi_super = sb;
 103
 104         error = sbi->osi_ops->o_get_info(sbi->osi_conn_info.conn_id,
 105                                          strlen("blocksize"),
 106                                          "blocksize",
 107                                          &scratch, (void *)&blocksize);
 108         if ( error ) {
 109                 printk("Getinfo call to drive failed (blocksize)\n");
 110                 goto error;
 111         }
 112
 113         error = sbi->osi_ops->o_get_info(sbi->osi_conn_info.conn_id,
 114                                          strlen("blocksize_bits"),
 115                                          "blocksize_bits",
 116                                          &scratch, (void *)&blocksize_bits);
 117         if ( error ) {
 118                 printk("Getinfo call to drive failed (blocksize_bits)\n");
 119                 goto error;
 120         }
 121
 122         error = sbi->osi_ops->o_get_info(sbi->osi_conn_info.conn_id,
 123                                          strlen("root_ino"),
 124                                          "root_ino",
 125                                          &scratch, (void *)&root_ino);
 126         if ( error ) {
 127                 printk("Getinfo call to drive failed (root_ino)\n");
 128                 goto error;
 129         }
 130
 131
 132
 133         lock_super(sb);
 134         sb->u.generic_sbp = sbi;
 135
 136         sb->s_blocksize = blocksize;
 137         sb->s_blocksize_bits = (unsigned char)blocksize_bits;
 138         sb->s_magic = OBDFS_SUPER_MAGIC;
 139         sb->s_op = &obdfs_super_operations;
 140
 141         /* make root inode */
 142         root = iget(sb, root_ino);
 143         if (!root || is_bad_inode(root)) {
 144             printk("OBDFS: bad iget for root\n");
 145             sb->s_dev = 0;
 146             error = ENOENT;
 147             unlock_super(sb);
 148             goto error;
 149         }
 150
 151
 152         printk("obdfs_read_super: sbdev %d,  rootinode is %ld dev %d, blocksize %ld, "
 153                "blocksize bits %ld\n",
 154                sb->s_dev, root->i_ino, root->i_dev, blocksize, blocksize_bits);
 155         sb->s_root = d_alloc_root(root);
 156         unlock_super(sb);
 157         EXIT;
 158         return sb;
 159
 160  error:
 161         EXIT;
 162         MOD_DEC_USE_COUNT;
 163         if (sbi) {
 164                 sbi->osi_super = NULL;
 165         }
 166         if (root) {
 167                 iput(root);
 168         }
 169         sb->s_dev = 0;
 170         return NULL;
 171 }
 172
 173 static void obdfs_put_super(struct super_block *sb)
 174 {
 175         struct obdfs_sb_info *sbi;
 176
 177         ENTRY;
 178
 179
 180         sb->s_dev = 0;
 181
 182         /* XXX flush stuff */
 183         sbi = sb->u.generic_sbp;
 184         sb->u.generic_sbp = NULL;
 185         sbi->osi_ops->o_disconnect(sbi->osi_conn_info.conn_id);
 186         sbi->osi_super = NULL;
 187
 188
 189         printk("OBDFS: Bye bye.\n");
 190         memset(sbi, 0, sizeof(* sbi));
 191
 192         MOD_DEC_USE_COUNT;
 193         EXIT;
 194 }
 195
 196 extern struct inode_operations obdfs_inode_ops;
 197
 198 /* all filling in of inodes postponed until lookup */
 199 void obdfs_read_inode(struct inode *inode)
 200 {
 201         int error;
 202         struct obdfs_sb_info *sbi = inode->i_sb->u.generic_sbp;
 203         ENTRY;
 204
 205         error = sbi->osi_ops->o_getattr(sbi->osi_conn_info.conn_id,
 206                                         inode->i_ino, inode);
 207         if (error) {
 208                 printk("obdfs_read_inode: obd_getattr fails (%d)\n", error);
 209                 return;
 210         }
 211
 212         IDEBUG(inode);
 213         inode->i_op = &obdfs_inode_ops;
 214         return;
 215 }
 216
 217 static void obdfs_write_inode(struct inode *inode)
 218 {
 219         struct obdfs_sb_info *sbi;
 220         int error;
 221
 222         sbi = inode->i_sb->u.generic_sbp;
 223         error = sbi->osi_ops->o_setattr(sbi->osi_conn_info.conn_id,
 224                                         inode->i_ino, inode);
 225         if (error) {
 226                 printk("obdfs_write_inode: obd_setattr fails (%d)\n", error);
 227                 return;
 228         }
 229
 230         return;
 231 }
 232
 233 static void obdfs_delete_inode(struct inode *inode)
 234 {
 235         struct obdfs_sb_info *sbi;
 236         int error;
 237         ENTRY;
 238
 239         sbi = inode->i_sb->u.generic_sbp;
 240         error = sbi->osi_ops->o_destroy(sbi->osi_conn_info.conn_id,
 241                                         inode->i_ino);
 242         if (error) {
 243                 printk("obdfs_delete_node: ibd_destroy fails (%d)\n", error);
 244                 return;
 245         }
 246
 247         EXIT;
 248 }
 249
 250 static int  obdfs_notify_change(struct dentry *de, struct iattr *iattr)
 251 {
 252         struct inode *inode = de->d_inode;
 253         struct iattr saved_copy;
 254         struct obdfs_sb_info * sbi;
 255         int error;
 256
 257         ENTRY;
 258         inode_to_iattr(inode, &saved_copy);
 259
 260         sbi = inode->i_sb->u.generic_sbp;
 261         inode_setattr(inode, iattr);
 262         error = sbi->osi_ops->o_setattr(sbi->osi_conn_info.conn_id,
 263                                         inode->i_ino, inode);
 264         if ( error ) {
 265                 inode_setattr(inode, &saved_copy);
 266                 printk("obdfs_notify_change: obd_setattr fails (%d)\n", error);
 267                 return error;
 268         }
 269         EXIT;
 270         return error;
 271 }
 272
 273
 274 static int obdfs_statfs(struct super_block *sb, struct statfs *buf,
 275                        int bufsize)
 276 {
 277         struct statfs tmp;
 278         struct obdfs_sb_info * sbi;
 279         int error;
 280
 281         ENTRY;
 282
 283         sbi = sb->u.generic_sbp;
 284         error = sbi->osi_ops->o_statfs(sbi->osi_conn_info.conn_id, &tmp);
 285         if ( error ) {
 286                 printk("obdfs_notify_change: obd_statfs fails (%d)\n", error);
 287                 return error;
 288         }
 289         copy_to_user(buf, &tmp, (bufsize<sizeof(tmp)) ? bufsize : sizeof(tmp));
 290
 291         EXIT;
 292
 293         return error;
 294 }
 295
 296 struct file_system_type obdfs_fs_type = {
 297    "obdfs", 0, obdfs_read_super, NULL
 298 };
 299
 300 int init_obdfs(void)
 301 {
 302         printk(KERN_INFO "OBDFS v0.1, braam@stelias.com\n");
 303
 304         obdfs_sysctl_init();
 305
 306         obd_sbi = &obdfs_super_info;
 307         obd_fso = &obdfs_file_ops;
 308
 309         return register_filesystem(&obdfs_fs_type);
 310 }
 311
 312
 313 #ifdef MODULE
 314 int init_module(void)
 315 {
 316         return init_obdfs();
 317 }
 318
 319 void cleanup_module(void)
 320 {
 321         ENTRY;
 322
 323         obdfs_sysctl_clean();
 324         unregister_filesystem(&obdfs_fs_type);
 325 }
 326 void obdfs_psdev_dec_use_count(void)
 327 {
 328         MOD_DEC_USE_COUNT;
 329 }
 330
 331 EXPORT_SYMBOL(obdfs_psdev_dec_use_count);
 332
 333 #endif