LXR linux/fs/freevxfs/vxfs

   1/*
   2 * Copyright (c) 2000-2001 Christoph Hellwig.
   3 * Copyright (c) 2016 Krzysztof Blaszkowski
   4 * All rights reserved.
   5 *
   6 * Redistribution and use in source and binary forms, with or without
   7 * modification, are permitted provided that the following conditions
   8 * are met:
   9 * 1. Redistributions of source code must retain the above copyright
  10 *    notice, this list of conditions, and the following disclaimer,
  11 *    without modification.
  12 * 2. The name of the author may not be used to endorse or promote products
  13 *    derived from this software without specific prior written permission.
  14 *
  15 * Alternatively, this software may be distributed under the terms of the
  16 * GNU General Public License ("GPL").
  17 *
  18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28 * SUCH DAMAGE.
  29 */
  30
  31/*
  32 * Veritas filesystem driver - inode routines.
  33 */
  34#include <linux/fs.h>
  35#include <linux/buffer_head.h>
  36#include <linux/pagemap.h>
  37#include <linux/kernel.h>
  38#include <linux/slab.h>
  39#include <linux/namei.h>
  40
  41#include "vxfs.h"
  42#include "vxfs_inode.h"
  43#include "vxfs_extern.h"
  44
  45
  46#ifdef DIAGNOSTIC
  47/*
  48 * Dump inode contents (partially).
  49 */
  50void
  51vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
  52{
  53        printk(KERN_DEBUG "\n\n");
  54        if (ino)
  55                printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
  56        else
  57                printk(KERN_DEBUG "dumping unknown vxfs inode\n");
  58
  59        printk(KERN_DEBUG "---------------------------\n");
  60        printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
  61        printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
  62                        vip->vii_nlink, vip->vii_uid, vip->vii_gid);
  63        printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
  64                        vip->vii_size, vip->vii_blocks);
  65        printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
  66}
  67#endif
  68
  69/**
  70 * vxfs_transmod - mode for a VxFS inode
  71 * @vip:        VxFS inode
  72 *
  73 * Description:
  74 *  vxfs_transmod returns a Linux mode_t for a given
  75 *  VxFS inode structure.
  76 */
  77static __inline__ umode_t
  78vxfs_transmod(struct vxfs_inode_info *vip)
  79{
  80        umode_t                 ret = vip->vii_mode & ~VXFS_TYPE_MASK;
  81
  82        if (VXFS_ISFIFO(vip))
  83                ret |= S_IFIFO;
  84        if (VXFS_ISCHR(vip))
  85                ret |= S_IFCHR;
  86        if (VXFS_ISDIR(vip))
  87                ret |= S_IFDIR;
  88        if (VXFS_ISBLK(vip))
  89                ret |= S_IFBLK;
  90        if (VXFS_ISLNK(vip))
  91                ret |= S_IFLNK;
  92        if (VXFS_ISREG(vip))
  93                ret |= S_IFREG;
  94        if (VXFS_ISSOC(vip))
  95                ret |= S_IFSOCK;
  96
  97        return (ret);
  98}
  99
 100static inline void dip2vip_cpy(struct vxfs_sb_info *sbi,
 101                struct vxfs_inode_info *vip, struct vxfs_dinode *dip)
 102{
 103        struct inode *inode = &vip->vfs_inode;
 104
 105        vip->vii_mode = fs32_to_cpu(sbi, dip->vdi_mode);
 106        vip->vii_nlink = fs32_to_cpu(sbi, dip->vdi_nlink);
 107        vip->vii_uid = fs32_to_cpu(sbi, dip->vdi_uid);
 108        vip->vii_gid = fs32_to_cpu(sbi, dip->vdi_gid);
 109        vip->vii_size = fs64_to_cpu(sbi, dip->vdi_size);
 110        vip->vii_atime = fs32_to_cpu(sbi, dip->vdi_atime);
 111        vip->vii_autime = fs32_to_cpu(sbi, dip->vdi_autime);
 112        vip->vii_mtime = fs32_to_cpu(sbi, dip->vdi_mtime);
 113        vip->vii_mutime = fs32_to_cpu(sbi, dip->vdi_mutime);
 114        vip->vii_ctime = fs32_to_cpu(sbi, dip->vdi_ctime);
 115        vip->vii_cutime = fs32_to_cpu(sbi, dip->vdi_cutime);
 116        vip->vii_orgtype = dip->vdi_orgtype;
 117
 118        vip->vii_blocks = fs32_to_cpu(sbi, dip->vdi_blocks);
 119        vip->vii_gen = fs32_to_cpu(sbi, dip->vdi_gen);
 120
 121        if (VXFS_ISDIR(vip))
 122                vip->vii_dotdot = fs32_to_cpu(sbi, dip->vdi_dotdot);
 123        else if (!VXFS_ISREG(vip) && !VXFS_ISLNK(vip))
 124                vip->vii_rdev = fs32_to_cpu(sbi, dip->vdi_rdev);
 125
 126        /* don't endian swap the fields that differ by orgtype */
 127        memcpy(&vip->vii_org, &dip->vdi_org, sizeof(vip->vii_org));
 128
 129        inode->i_mode = vxfs_transmod(vip);
 130        i_uid_write(inode, (uid_t)vip->vii_uid);
 131        i_gid_write(inode, (gid_t)vip->vii_gid);
 132
 133        set_nlink(inode, vip->vii_nlink);
 134        inode->i_size = vip->vii_size;
 135
 136        inode->i_atime.tv_sec = vip->vii_atime;
 137        inode->i_ctime.tv_sec = vip->vii_ctime;
 138        inode->i_mtime.tv_sec = vip->vii_mtime;
 139        inode->i_atime.tv_nsec = 0;
 140        inode->i_ctime.tv_nsec = 0;
 141        inode->i_mtime.tv_nsec = 0;
 142
 143        inode->i_blocks = vip->vii_blocks;
 144        inode->i_generation = vip->vii_gen;
 145}
 146
 147/**
 148 * vxfs_blkiget - find inode based on extent #
 149 * @sbp:        superblock of the filesystem we search in
 150 * @extent:     number of the extent to search
 151 * @ino:        inode number to search
 152 *
 153 * Description:
 154 *  vxfs_blkiget searches inode @ino in the filesystem described by
 155 *  @sbp in the extent @extent.
 156 *  Returns the matching VxFS inode on success, else a NULL pointer.
 157 *
 158 * NOTE:
 159 *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
 160 *  buffercache.  This function should not be used outside the
 161 *  read_super() method, otherwise the data may be incoherent.
 162 */
 163struct inode *
 164vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
 165{
 166        struct buffer_head              *bp;
 167        struct inode                    *inode;
 168        u_long                          block, offset;
 169
 170        inode = new_inode(sbp);
 171        if (!inode)
 172                return NULL;
 173        inode->i_ino = get_next_ino();
 174
 175        block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
 176        offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
 177        bp = sb_bread(sbp, block);
 178
 179        if (bp && buffer_mapped(bp)) {
 180                struct vxfs_inode_info  *vip = VXFS_INO(inode);
 181                struct vxfs_dinode      *dip;
 182
 183                dip = (struct vxfs_dinode *)(bp->b_data + offset);
 184                dip2vip_cpy(VXFS_SBI(sbp), vip, dip);
 185                vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
 186#ifdef DIAGNOSTIC
 187                vxfs_dumpi(vip, ino);
 188#endif
 189                brelse(bp);
 190                return inode;
 191        }
 192
 193        printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
 194        brelse(bp);
 195        iput(inode);
 196        return NULL;
 197}
 198
 199/**
 200 * __vxfs_iget - generic find inode facility
 201 * @ilistp:             inode list
 202 * @vip:                VxFS inode to fill in
 203 * @ino:                inode number
 204 *
 205 * Description:
 206 *  Search the for inode number @ino in the filesystem
 207 *  described by @sbp.  Use the specified inode table (@ilistp).
 208 *  Returns the matching inode on success, else an error code.
 209 */
 210static int
 211__vxfs_iget(struct inode *ilistp, struct vxfs_inode_info *vip, ino_t ino)
 212{
 213        struct page                     *pp;
 214        u_long                          offset;
 215
 216        offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
 217        pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
 218
 219        if (!IS_ERR(pp)) {
 220                struct vxfs_dinode      *dip;
 221                caddr_t                 kaddr = (char *)page_address(pp);
 222
 223                dip = (struct vxfs_dinode *)(kaddr + offset);
 224                dip2vip_cpy(VXFS_SBI(ilistp->i_sb), vip, dip);
 225                vip->vfs_inode.i_mapping->a_ops = &vxfs_aops;
 226#ifdef DIAGNOSTIC
 227                vxfs_dumpi(vip, ino);
 228#endif
 229                vxfs_put_page(pp);
 230                return 0;
 231        }
 232
 233        printk(KERN_WARNING "vxfs: error on page 0x%p for inode %ld\n",
 234                pp, (unsigned long)ino);
 235        return PTR_ERR(pp);
 236}
 237
 238/**
 239 * vxfs_stiget - find inode using the structural inode list
 240 * @sbp:        VFS superblock
 241 * @ino:        inode #
 242 *
 243 * Description:
 244 *  Find inode @ino in the filesystem described by @sbp using
 245 *  the structural inode list.
 246 *  Returns the matching inode on success, else a NULL pointer.
 247 */
 248struct inode *
 249vxfs_stiget(struct super_block *sbp, ino_t ino)
 250{
 251        struct inode *inode;
 252        int error;
 253
 254        inode = new_inode(sbp);
 255        if (!inode)
 256                return NULL;
 257        inode->i_ino = get_next_ino();
 258
 259        error = __vxfs_iget(VXFS_SBI(sbp)->vsi_stilist, VXFS_INO(inode), ino);
 260        if (error) {
 261                iput(inode);
 262                return NULL;
 263        }
 264
 265        return inode;
 266}
 267
 268/**
 269 * vxfs_iget - get an inode
 270 * @sbp:        the superblock to get the inode for
 271 * @ino:        the number of the inode to get
 272 *
 273 * Description:
 274 *  vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
 275 *  in all relevant fields in the new inode.
 276 */
 277struct inode *
 278vxfs_iget(struct super_block *sbp, ino_t ino)
 279{
 280        struct vxfs_inode_info          *vip;
 281        const struct address_space_operations   *aops;
 282        struct inode *ip;
 283        int error;
 284
 285        ip = iget_locked(sbp, ino);
 286        if (!ip)
 287                return ERR_PTR(-ENOMEM);
 288        if (!(ip->i_state & I_NEW))
 289                return ip;
 290
 291        vip = VXFS_INO(ip);
 292        error = __vxfs_iget(VXFS_SBI(sbp)->vsi_ilist, vip, ino);
 293        if (error) {
 294                iget_failed(ip);
 295                return ERR_PTR(error);
 296        }
 297
 298        if (VXFS_ISIMMED(vip))
 299                aops = &vxfs_immed_aops;
 300        else
 301                aops = &vxfs_aops;
 302
 303        if (S_ISREG(ip->i_mode)) {
 304                ip->i_fop = &generic_ro_fops;
 305                ip->i_mapping->a_ops = aops;
 306        } else if (S_ISDIR(ip->i_mode)) {
 307                ip->i_op = &vxfs_dir_inode_ops;
 308                ip->i_fop = &vxfs_dir_operations;
 309                ip->i_mapping->a_ops = aops;
 310        } else if (S_ISLNK(ip->i_mode)) {
 311                if (!VXFS_ISIMMED(vip)) {
 312                        ip->i_op = &page_symlink_inode_operations;
 313                        inode_nohighmem(ip);
 314                        ip->i_mapping->a_ops = &vxfs_aops;
 315                } else {
 316                        ip->i_op = &simple_symlink_inode_operations;
 317                        ip->i_link = vip->vii_immed.vi_immed;
 318                        nd_terminate_link(ip->i_link, ip->i_size,
 319                                          sizeof(vip->vii_immed.vi_immed) - 1);
 320                }
 321        } else
 322                init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
 323
 324        unlock_new_inode(ip);
 325        return ip;
 326}
 327
 328/**
 329 * vxfs_evict_inode - remove inode from main memory
 330 * @ip:         inode to discard.
 331 *
 332 * Description:
 333 *  vxfs_evict_inode() is called on the final iput and frees the private
 334 *  inode area.
 335 */
 336void
 337vxfs_evict_inode(struct inode *ip)
 338{
 339        truncate_inode_pages_final(&ip->i_data);
 340        clear_inode(ip);
 341}
 342