fs/freevxfs/vxfs_inode.c

   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
  44 extern const struct address_space_operations vxfs_aops;
  45 extern const struct address_space_operations vxfs_immed_aops;
  46
  47 extern struct inode_operations vxfs_immed_symlink_iops;
  48
  49 struct kmem_cache               *vxfs_inode_cachep;
  50
  51
  52 #ifdef DIAGNOSTIC
  53 /*
  54  * Dump inode contents (partially).
  55  */
  56 void
  57 vxfs_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  */
  92 struct vxfs_inode_info *
  93 vxfs_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 (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
 117 fail:
 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  */
 134 static 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
 162 fail:
 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  */
 178 struct vxfs_inode_info *
 179 vxfs_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  */
 192 static __inline__ mode_t
 193 vxfs_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  */
 224 static void
 225 vxfs_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  */
 259 struct inode *
 260 vxfs_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  */
 278 void
 279 vxfs_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  */
 292 void
 293 vxfs_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  */
 337 void
 338 vxfs_clear_inode(struct inode *ip)
 339 {
 340         kmem_cache_free(vxfs_inode_cachep, ip->i_private);
 341 }