LXR linux/fs/freevxfs/vxfs

   1/*
   2 * Copyright (c) 2000-2001 Christoph Hellwig.
   3 * All rights reserved.
   4 *
   5 * Redistribution and use in source and binary forms, with or without
   6 * modification, are permitted provided that the following conditions
   7 * are met:
   8 * 1. Redistributions of source code must retain the above copyright
   9 *    notice, this list of conditions, and the following disclaimer,
  10 *    without modification.
  11 * 2. The name of the author may not be used to endorse or promote products
  12 *    derived from this software without specific prior written permission.
  13 *
  14 * Alternatively, this software may be distributed under the terms of the
  15 * GNU General Public License ("GPL").
  16 *
  17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27 * SUCH DAMAGE.
  28 */
  29
  30/*
  31 * Veritas filesystem driver - inode routines.
  32 */
  33#include <linux/fs.h>
  34#include <linux/buffer_head.h>
  35#include <linux/pagemap.h>
  36#include <linux/kernel.h>
  37#include <linux/slab.h>
  38
  39#include "vxfs.h"
  40#include "vxfs_inode.h"
  41#include "vxfs_extern.h"
  42
  43
  44extern const struct address_space_operations vxfs_aops;
  45extern const struct address_space_operations vxfs_immed_aops;
  46
  47extern const struct inode_operations vxfs_immed_symlink_iops;
  48
  49struct kmem_cache               *vxfs_inode_cachep;
  50
  51
  52#ifdef DIAGNOSTIC
  53/*
  54 * Dump inode contents (partially).
  55 */
  56void
  57vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
  58{
  59        printk(KERN_DEBUG "\n\n");
  60        if (ino)
  61                printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
  62        else
  63                printk(KERN_DEBUG "dumping unknown vxfs inode\n");
  64
  65        printk(KERN_DEBUG "---------------------------\n");
  66        printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
  67        printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
  68                        vip->vii_nlink, vip->vii_uid, vip->vii_gid);
  69        printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
  70                        vip->vii_size, vip->vii_blocks);
  71        printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
  72}
  73#endif
  74
  75
  76/**
  77 * vxfs_blkiget - find inode based on extent #
  78 * @sbp:        superblock of the filesystem we search in
  79 * @extent:     number of the extent to search
  80 * @ino:        inode number to search
  81 *
  82 * Description:
  83 *  vxfs_blkiget searches inode @ino in the filesystem described by
  84 *  @sbp in the extent @extent.
  85 *  Returns the matching VxFS inode on success, else a NULL pointer.
  86 *
  87 * NOTE:
  88 *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
  89 *  buffercache.  This function should not be used outside the
  90 *  read_super() method, otherwise the data may be incoherent.
  91 */
  92struct vxfs_inode_info *
  93vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
  94{
  95        struct buffer_head              *bp;
  96        u_long                          block, offset;
  97
  98        block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
  99        offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
 100        bp = sb_bread(sbp, block);
 101
 102        if (bp && buffer_mapped(bp)) {
 103                struct vxfs_inode_info  *vip;
 104                struct vxfs_dinode      *dip;
 105
 106                if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
 107                        goto fail;
 108                dip = (struct vxfs_dinode *)(bp->b_data + offset);
 109                memcpy(vip, dip, sizeof(*vip));
 110#ifdef DIAGNOSTIC
 111                vxfs_dumpi(vip, ino);
 112#endif
 113                brelse(bp);
 114                return (vip);
 115        }
 116
 117fail:
 118        printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
 119        brelse(bp);
 120        return NULL;
 121}
 122
 123/**
 124 * __vxfs_iget - generic find inode facility
 125 * @sbp:                VFS superblock
 126 * @ino:                inode number
 127 * @ilistp:             inode list
 128 *
 129 * Description:
 130 *  Search the for inode number @ino in the filesystem
 131 *  described by @sbp.  Use the specified inode table (@ilistp).
 132 *  Returns the matching VxFS inode on success, else a NULL pointer.
 133 */
 134static struct vxfs_inode_info *
 135__vxfs_iget(ino_t ino, struct inode *ilistp)
 136{
 137        struct page                     *pp;
 138        u_long                          offset;
 139
 140        offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
 141        pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
 142
 143        if (!IS_ERR(pp)) {
 144                struct vxfs_inode_info  *vip;
 145                struct vxfs_dinode      *dip;
 146                caddr_t                 kaddr = (char *)page_address(pp);
 147
 148                if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
 149                        goto fail;
 150                dip = (struct vxfs_dinode *)(kaddr + offset);
 151                memcpy(vip, dip, sizeof(*vip));
 152#ifdef DIAGNOSTIC
 153                vxfs_dumpi(vip, ino);
 154#endif
 155                vxfs_put_page(pp);
 156                return (vip);
 157        }
 158
 159        printk(KERN_WARNING "vxfs: error on page %p\n", pp);
 160        return NULL;
 161
 162fail:
 163        printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
 164        vxfs_put_page(pp);
 165        return NULL;
 166}
 167
 168/**
 169 * vxfs_stiget - find inode using the structural inode list
 170 * @sbp:        VFS superblock
 171 * @ino:        inode #
 172 *
 173 * Description:
 174 *  Find inode @ino in the filesystem described by @sbp using
 175 *  the structural inode list.
 176 *  Returns the matching VxFS inode on success, else a NULL pointer.
 177 */
 178struct vxfs_inode_info *
 179vxfs_stiget(struct super_block *sbp, ino_t ino)
 180{
 181        return __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
 182}
 183
 184/**
 185 * vxfs_transmod - mode for a VxFS inode
 186 * @vip:        VxFS inode
 187 *
 188 * Description:
 189 *  vxfs_transmod returns a Linux mode_t for a given
 190 *  VxFS inode structure.
 191 */
 192static __inline__ mode_t
 193vxfs_transmod(struct vxfs_inode_info *vip)
 194{
 195        mode_t                  ret = vip->vii_mode & ~VXFS_TYPE_MASK;
 196
 197        if (VXFS_ISFIFO(vip))
 198                ret |= S_IFIFO;
 199        if (VXFS_ISCHR(vip))
 200                ret |= S_IFCHR;
 201        if (VXFS_ISDIR(vip))
 202                ret |= S_IFDIR;
 203        if (VXFS_ISBLK(vip))
 204                ret |= S_IFBLK;
 205        if (VXFS_ISLNK(vip))
 206                ret |= S_IFLNK;
 207        if (VXFS_ISREG(vip))
 208                ret |= S_IFREG;
 209        if (VXFS_ISSOC(vip))
 210                ret |= S_IFSOCK;
 211
 212        return (ret);
 213}
 214
 215/**
 216 * vxfs_iinit- helper to fill inode fields
 217 * @ip:         VFS inode
 218 * @vip:        VxFS inode
 219 *
 220 * Description:
 221 *  vxfs_instino is a helper function to fill in all relevant
 222 *  fields in @ip from @vip.
 223 */
 224static void
 225vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
 226{
 227
 228        ip->i_mode = vxfs_transmod(vip);
 229        ip->i_uid = (uid_t)vip->vii_uid;
 230        ip->i_gid = (gid_t)vip->vii_gid;
 231
 232        ip->i_nlink = vip->vii_nlink;
 233        ip->i_size = vip->vii_size;
 234
 235        ip->i_atime.tv_sec = vip->vii_atime;
 236        ip->i_ctime.tv_sec = vip->vii_ctime;
 237        ip->i_mtime.tv_sec = vip->vii_mtime;
 238        ip->i_atime.tv_nsec = 0;
 239        ip->i_ctime.tv_nsec = 0;
 240        ip->i_mtime.tv_nsec = 0;
 241
 242        ip->i_blocks = vip->vii_blocks;
 243        ip->i_generation = vip->vii_gen;
 244
 245        ip->i_private = vip;
 246        
 247}
 248
 249/**
 250 * vxfs_get_fake_inode - get fake inode structure
 251 * @sbp:                filesystem superblock
 252 * @vip:                fspriv inode
 253 *
 254 * Description:
 255 *  vxfs_fake_inode gets a fake inode (not in the inode hash) for a
 256 *  superblock, vxfs_inode pair.
 257 *  Returns the filled VFS inode.
 258 */
 259struct inode *
 260vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
 261{
 262        struct inode                    *ip = NULL;
 263
 264        if ((ip = new_inode(sbp))) {
 265                vxfs_iinit(ip, vip);
 266                ip->i_mapping->a_ops = &vxfs_aops;
 267        }
 268        return (ip);
 269}
 270
 271/**
 272 * vxfs_put_fake_inode - free faked inode
 273 * *ip:                 VFS inode
 274 *
 275 * Description:
 276 *  vxfs_put_fake_inode frees all data asssociated with @ip.
 277 */
 278void
 279vxfs_put_fake_inode(struct inode *ip)
 280{
 281        iput(ip);
 282}
 283
 284/**
 285 * vxfs_read_inode - fill in inode information
 286 * @ip:         inode pointer to fill
 287 *
 288 * Description:
 289 *  vxfs_read_inode reads the disk inode for @ip and fills
 290 *  in all relevant fields in @ip.
 291 */
 292void
 293vxfs_read_inode(struct inode *ip)
 294{
 295        struct super_block              *sbp = ip->i_sb;
 296        struct vxfs_inode_info          *vip;
 297        const struct address_space_operations   *aops;
 298        ino_t                           ino = ip->i_ino;
 299
 300        if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist)))
 301                return;
 302
 303        vxfs_iinit(ip, vip);
 304
 305        if (VXFS_ISIMMED(vip))
 306                aops = &vxfs_immed_aops;
 307        else
 308                aops = &vxfs_aops;
 309
 310        if (S_ISREG(ip->i_mode)) {
 311                ip->i_fop = &generic_ro_fops;
 312                ip->i_mapping->a_ops = aops;
 313        } else if (S_ISDIR(ip->i_mode)) {
 314                ip->i_op = &vxfs_dir_inode_ops;
 315                ip->i_fop = &vxfs_dir_operations;
 316                ip->i_mapping->a_ops = aops;
 317        } else if (S_ISLNK(ip->i_mode)) {
 318                if (!VXFS_ISIMMED(vip)) {
 319                        ip->i_op = &page_symlink_inode_operations;
 320                        ip->i_mapping->a_ops = &vxfs_aops;
 321                } else
 322                        ip->i_op = &vxfs_immed_symlink_iops;
 323        } else
 324                init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
 325
 326        return;
 327}
 328
 329/**
 330 * vxfs_clear_inode - remove inode from main memory
 331 * @ip:         inode to discard.
 332 *
 333 * Description:
 334 *  vxfs_clear_inode() is called on the final iput and frees the private
 335 *  inode area.
 336 */
 337void
 338vxfs_clear_inode(struct inode *ip)
 339{
 340        kmem_cache_free(vxfs_inode_cachep, ip->i_private);
 341}
 342