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 struct address_space_operations vxfs_aops;
  45 extern struct address_space_operations vxfs_immed_aops;
  46
  47 extern struct inode_operations vxfs_immed_symlink_iops;
  48
  49 static struct file_operations vxfs_file_operations = {
  50         .open =                 generic_file_open,
  51         .llseek =               generic_file_llseek,
  52         .read =                 generic_file_read,
  53         .mmap =                 generic_file_mmap,
  54         .sendfile =             generic_file_sendfile,
  55 };
  56
  57
  58 kmem_cache_t            *vxfs_inode_cachep;
  59
  60
  61 #ifdef DIAGNOSTIC
  62 /*
  63  * Dump inode contents (partially).
  64  */
  65 void
  66 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
  67 {
  68         printk(KERN_DEBUG "\n\n");
  69         if (ino)
  70                 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
  71         else
  72                 printk(KERN_DEBUG "dumping unknown vxfs inode\n");
  73
  74         printk(KERN_DEBUG "---------------------------\n");
  75         printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
  76         printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
  77                         vip->vii_nlink, vip->vii_uid, vip->vii_gid);
  78         printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
  79                         vip->vii_size, vip->vii_blocks);
  80         printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
  81 }
  82 #endif
  83
  84
  85 /**
  86  * vxfs_blkiget - find inode based on extent #
  87  * @sbp:        superblock of the filesystem we search in
  88  * @extent:     number of the extent to search
  89  * @ino:        inode number to search
  90  *
  91  * Description:
  92  *  vxfs_blkiget searches inode @ino in the filesystem described by
  93  *  @sbp in the extent @extent.
  94  *  Returns the matching VxFS inode on success, else a NULL pointer.
  95  *
  96  * NOTE:
  97  *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
  98  *  buffercache.  This function should not be used outside the
  99  *  read_super() method, otherwise the data may be incoherent.
 100  */
 101 struct vxfs_inode_info *
 102 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
 103 {
 104         struct buffer_head              *bp;
 105         u_long                          block, offset;
 106
 107         block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
 108         offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
 109         bp = sb_bread(sbp, block);
 110
 111         if (buffer_mapped(bp)) {
 112                 struct vxfs_inode_info  *vip;
 113                 struct vxfs_dinode      *dip;
 114
 115                 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))
 116                         goto fail;
 117                 dip = (struct vxfs_dinode *)(bp->b_data + offset);
 118                 memcpy(vip, dip, sizeof(*vip));
 119 #ifdef DIAGNOSTIC
 120                 vxfs_dumpi(vip, ino);
 121 #endif
 122                 brelse(bp);
 123                 return (vip);
 124         }
 125
 126 fail:
 127         printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
 128         brelse(bp);
 129         return NULL;
 130 }
 131
 132 /**
 133  * __vxfs_iget - generic find inode facility
 134  * @sbp:                VFS superblock
 135  * @ino:                inode number
 136  * @ilistp:             inode list
 137  *
 138  * Description:
 139  *  Search the for inode number @ino in the filesystem
 140  *  described by @sbp.  Use the specified inode table (@ilistp).
 141  *  Returns the matching VxFS inode on success, else a NULL pointer.
 142  */
 143 static struct vxfs_inode_info *
 144 __vxfs_iget(ino_t ino, struct inode *ilistp)
 145 {
 146         struct page                     *pp;
 147         u_long                          offset;
 148
 149         offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
 150         pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
 151
 152         if (!IS_ERR(pp)) {
 153                 struct vxfs_inode_info  *vip;
 154                 struct vxfs_dinode      *dip;
 155                 caddr_t                 kaddr = (char *)page_address(pp);
 156
 157                 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))
 158                         goto fail;
 159                 dip = (struct vxfs_dinode *)(kaddr + offset);
 160                 memcpy(vip, dip, sizeof(*vip));
 161 #ifdef DIAGNOSTIC
 162                 vxfs_dumpi(vip, ino);
 163 #endif
 164                 vxfs_put_page(pp);
 165                 return (vip);
 166         }
 167
 168         printk(KERN_WARNING "vxfs: error on page %p\n", pp);
 169         return NULL;
 170
 171 fail:
 172         printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
 173         vxfs_put_page(pp);
 174         return NULL;
 175 }
 176
 177 /**
 178  * vxfs_stiget - find inode using the structural inode list
 179  * @sbp:        VFS superblock
 180  * @ino:        inode #
 181  *
 182  * Description:
 183  *  Find inode @ino in the filesystem described by @sbp using
 184  *  the structural inode list.
 185  *  Returns the matching VxFS inode on success, else a NULL pointer.
 186  */
 187 struct vxfs_inode_info *
 188 vxfs_stiget(struct super_block *sbp, ino_t ino)
 189 {
 190         return __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
 191 }
 192
 193 /**
 194  * vxfs_transmod - mode for a VxFS inode
 195  * @vip:        VxFS inode
 196  *
 197  * Description:
 198  *  vxfs_transmod returns a Linux mode_t for a given
 199  *  VxFS inode structure.
 200  */
 201 static __inline__ mode_t
 202 vxfs_transmod(struct vxfs_inode_info *vip)
 203 {
 204         mode_t                  ret = vip->vii_mode & ~VXFS_TYPE_MASK;
 205
 206         if (VXFS_ISFIFO(vip))
 207                 ret |= S_IFIFO;
 208         if (VXFS_ISCHR(vip))
 209                 ret |= S_IFCHR;
 210         if (VXFS_ISDIR(vip))
 211                 ret |= S_IFDIR;
 212         if (VXFS_ISBLK(vip))
 213                 ret |= S_IFBLK;
 214         if (VXFS_ISLNK(vip))
 215                 ret |= S_IFLNK;
 216         if (VXFS_ISREG(vip))
 217                 ret |= S_IFREG;
 218         if (VXFS_ISSOC(vip))
 219                 ret |= S_IFSOCK;
 220
 221         return (ret);
 222 }
 223
 224 /**
 225  * vxfs_iinit- helper to fill inode fields
 226  * @ip:         VFS inode
 227  * @vip:        VxFS inode
 228  *
 229  * Description:
 230  *  vxfs_instino is a helper function to fill in all relevant
 231  *  fields in @ip from @vip.
 232  */
 233 static void
 234 vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
 235 {
 236
 237         ip->i_mode = vxfs_transmod(vip);
 238         ip->i_uid = (uid_t)vip->vii_uid;
 239         ip->i_gid = (gid_t)vip->vii_gid;
 240
 241         ip->i_nlink = vip->vii_nlink;
 242         ip->i_size = vip->vii_size;
 243
 244         ip->i_atime.tv_sec = vip->vii_atime;
 245         ip->i_ctime.tv_sec = vip->vii_ctime;
 246         ip->i_mtime.tv_sec = vip->vii_mtime;
 247         ip->i_atime.tv_nsec = 0;
 248         ip->i_ctime.tv_nsec = 0;
 249         ip->i_mtime.tv_nsec = 0;
 250
 251         ip->i_blksize = PAGE_SIZE;
 252         ip->i_blocks = vip->vii_blocks;
 253         ip->i_generation = vip->vii_gen;
 254
 255         ip->u.generic_ip = (void *)vip;
 256
 257 }
 258
 259 /**
 260  * vxfs_get_fake_inode - get fake inode structure
 261  * @sbp:                filesystem superblock
 262  * @vip:                fspriv inode
 263  *
 264  * Description:
 265  *  vxfs_fake_inode gets a fake inode (not in the inode hash) for a
 266  *  superblock, vxfs_inode pair.
 267  *  Returns the filled VFS inode.
 268  */
 269 struct inode *
 270 vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
 271 {
 272         struct inode                    *ip = NULL;
 273
 274         if ((ip = new_inode(sbp))) {
 275                 vxfs_iinit(ip, vip);
 276                 ip->i_mapping->a_ops = &vxfs_aops;
 277         }
 278         return (ip);
 279 }
 280
 281 /**
 282  * vxfs_put_fake_inode - free faked inode
 283  * *ip:                 VFS inode
 284  *
 285  * Description:
 286  *  vxfs_put_fake_inode frees all data asssociated with @ip.
 287  */
 288 void
 289 vxfs_put_fake_inode(struct inode *ip)
 290 {
 291         iput(ip);
 292 }
 293
 294 /**
 295  * vxfs_read_inode - fill in inode information
 296  * @ip:         inode pointer to fill
 297  *
 298  * Description:
 299  *  vxfs_read_inode reads the disk inode for @ip and fills
 300  *  in all relevant fields in @ip.
 301  */
 302 void
 303 vxfs_read_inode(struct inode *ip)
 304 {
 305         struct super_block              *sbp = ip->i_sb;
 306         struct vxfs_inode_info          *vip;
 307         struct address_space_operations *aops;
 308         ino_t                           ino = ip->i_ino;
 309
 310         if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist)))
 311                 return;
 312
 313         vxfs_iinit(ip, vip);
 314
 315         if (VXFS_ISIMMED(vip))
 316                 aops = &vxfs_immed_aops;
 317         else
 318                 aops = &vxfs_aops;
 319
 320         if (S_ISREG(ip->i_mode)) {
 321                 ip->i_fop = &vxfs_file_operations;
 322                 ip->i_mapping->a_ops = aops;
 323         } else if (S_ISDIR(ip->i_mode)) {
 324                 ip->i_op = &vxfs_dir_inode_ops;
 325                 ip->i_fop = &vxfs_dir_operations;
 326                 ip->i_mapping->a_ops = aops;
 327         } else if (S_ISLNK(ip->i_mode)) {
 328                 if (!VXFS_ISIMMED(vip)) {
 329                         ip->i_op = &page_symlink_inode_operations;
 330                         ip->i_mapping->a_ops = &vxfs_aops;
 331                 } else
 332                         ip->i_op = &vxfs_immed_symlink_iops;
 333         } else
 334                 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
 335
 336         return;
 337 }
 338
 339 /**
 340  * vxfs_clear_inode - remove inode from main memory
 341  * @ip:         inode to discard.
 342  *
 343  * Description:
 344  *  vxfs_clear_inode() is called on the final iput and frees the private
 345  *  inode area.
 346  */
 347 void
 348 vxfs_clear_inode(struct inode *ip)
 349 {
 350         kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip);
 351 }