fs/freevxfs/vxfs_inode.c

   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  */
  50 void
  51 vxfs_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  */
  77 static __inline__ umode_t
  78 vxfs_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
 100 static 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  */
 163 struct inode *
 164 vxfs_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  */
 210 static 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  */
 248 struct inode *
 249 vxfs_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  */
 277 struct inode *
 278 vxfs_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  */
 336 void
 337 vxfs_evict_inode(struct inode *ip)
 338 {
 339         truncate_inode_pages_final(&ip->i_data);
 340         clear_inode(ip);
 341 }