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