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 struct kmem_cache *vxfs_inode_cachep; 45 46 47 #ifdef DIAGNOSTIC 48 /* 49 * Dump inode contents (partially). 50 */ 51 void 52 vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino) 53 { 54 printk(KERN_DEBUG "\n\n"); 55 if (ino) 56 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino); 57 else 58 printk(KERN_DEBUG "dumping unknown vxfs inode\n"); 59 60 printk(KERN_DEBUG "---------------------------\n"); 61 printk(KERN_DEBUG "mode is %x\n", vip->vii_mode); 62 printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n", 63 vip->vii_nlink, vip->vii_uid, vip->vii_gid); 64 printk(KERN_DEBUG "size:%Lx, blocks:%u\n", 65 vip->vii_size, vip->vii_blocks); 66 printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype); 67 } 68 #endif 69 70 71 /** 72 * vxfs_blkiget - find inode based on extent # 73 * @sbp: superblock of the filesystem we search in 74 * @extent: number of the extent to search 75 * @ino: inode number to search 76 * 77 * Description: 78 * vxfs_blkiget searches inode @ino in the filesystem described by 79 * @sbp in the extent @extent. 80 * Returns the matching VxFS inode on success, else a NULL pointer. 81 * 82 * NOTE: 83 * While __vxfs_iget uses the pagecache vxfs_blkiget uses the 84 * buffercache. This function should not be used outside the 85 * read_super() method, otherwise the data may be incoherent. 86 */ 87 struct vxfs_inode_info * 88 vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino) 89 { 90 struct buffer_head *bp; 91 u_long block, offset; 92 93 block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize); 94 offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE); 95 bp = sb_bread(sbp, block); 96 97 if (bp && buffer_mapped(bp)) { 98 struct vxfs_inode_info *vip; 99 struct vxfs_dinode *dip; 100 101 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) 102 goto fail; 103 dip = (struct vxfs_dinode *)(bp->b_data + offset); 104 memcpy(vip, dip, sizeof(*vip)); 105 #ifdef DIAGNOSTIC 106 vxfs_dumpi(vip, ino); 107 #endif 108 brelse(bp); 109 return (vip); 110 } 111 112 fail: 113 printk(KERN_WARNING "vxfs: unable to read block %ld\n", block); 114 brelse(bp); 115 return NULL; 116 } 117 118 /** 119 * __vxfs_iget - generic find inode facility 120 * @sbp: VFS superblock 121 * @ino: inode number 122 * @ilistp: inode list 123 * 124 * Description: 125 * Search the for inode number @ino in the filesystem 126 * described by @sbp. Use the specified inode table (@ilistp). 127 * Returns the matching VxFS inode on success, else an error code. 128 */ 129 static struct vxfs_inode_info * 130 __vxfs_iget(ino_t ino, struct inode *ilistp) 131 { 132 struct page *pp; 133 u_long offset; 134 135 offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE; 136 pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE); 137 138 if (!IS_ERR(pp)) { 139 struct vxfs_inode_info *vip; 140 struct vxfs_dinode *dip; 141 caddr_t kaddr = (char *)page_address(pp); 142 143 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) 144 goto fail; 145 dip = (struct vxfs_dinode *)(kaddr + offset); 146 memcpy(vip, dip, sizeof(*vip)); 147 #ifdef DIAGNOSTIC 148 vxfs_dumpi(vip, ino); 149 #endif 150 vxfs_put_page(pp); 151 return (vip); 152 } 153 154 printk(KERN_WARNING "vxfs: error on page %p\n", pp); 155 return ERR_CAST(pp); 156 157 fail: 158 printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino); 159 vxfs_put_page(pp); 160 return ERR_PTR(-ENOMEM); 161 } 162 163 /** 164 * vxfs_stiget - find inode using the structural inode list 165 * @sbp: VFS superblock 166 * @ino: inode # 167 * 168 * Description: 169 * Find inode @ino in the filesystem described by @sbp using 170 * the structural inode list. 171 * Returns the matching VxFS inode on success, else a NULL pointer. 172 */ 173 struct vxfs_inode_info * 174 vxfs_stiget(struct super_block *sbp, ino_t ino) 175 { 176 struct vxfs_inode_info *vip; 177 178 vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist); 179 return IS_ERR(vip) ? NULL : vip; 180 } 181 182 /** 183 * vxfs_transmod - mode for a VxFS inode 184 * @vip: VxFS inode 185 * 186 * Description: 187 * vxfs_transmod returns a Linux mode_t for a given 188 * VxFS inode structure. 189 */ 190 static __inline__ umode_t 191 vxfs_transmod(struct vxfs_inode_info *vip) 192 { 193 umode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK; 194 195 if (VXFS_ISFIFO(vip)) 196 ret |= S_IFIFO; 197 if (VXFS_ISCHR(vip)) 198 ret |= S_IFCHR; 199 if (VXFS_ISDIR(vip)) 200 ret |= S_IFDIR; 201 if (VXFS_ISBLK(vip)) 202 ret |= S_IFBLK; 203 if (VXFS_ISLNK(vip)) 204 ret |= S_IFLNK; 205 if (VXFS_ISREG(vip)) 206 ret |= S_IFREG; 207 if (VXFS_ISSOC(vip)) 208 ret |= S_IFSOCK; 209 210 return (ret); 211 } 212 213 /** 214 * vxfs_iinit- helper to fill inode fields 215 * @ip: VFS inode 216 * @vip: VxFS inode 217 * 218 * Description: 219 * vxfs_instino is a helper function to fill in all relevant 220 * fields in @ip from @vip. 221 */ 222 static void 223 vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip) 224 { 225 226 ip->i_mode = vxfs_transmod(vip); 227 i_uid_write(ip, (uid_t)vip->vii_uid); 228 i_gid_write(ip, (gid_t)vip->vii_gid); 229 230 set_nlink(ip, vip->vii_nlink); 231 ip->i_size = vip->vii_size; 232 233 ip->i_atime.tv_sec = vip->vii_atime; 234 ip->i_ctime.tv_sec = vip->vii_ctime; 235 ip->i_mtime.tv_sec = vip->vii_mtime; 236 ip->i_atime.tv_nsec = 0; 237 ip->i_ctime.tv_nsec = 0; 238 ip->i_mtime.tv_nsec = 0; 239 240 ip->i_blocks = vip->vii_blocks; 241 ip->i_generation = vip->vii_gen; 242 243 ip->i_private = vip; 244 245 } 246 247 /** 248 * vxfs_get_fake_inode - get fake inode structure 249 * @sbp: filesystem superblock 250 * @vip: fspriv inode 251 * 252 * Description: 253 * vxfs_fake_inode gets a fake inode (not in the inode hash) for a 254 * superblock, vxfs_inode pair. 255 * Returns the filled VFS inode. 256 */ 257 struct inode * 258 vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip) 259 { 260 struct inode *ip = NULL; 261 262 if ((ip = new_inode(sbp))) { 263 ip->i_ino = get_next_ino(); 264 vxfs_iinit(ip, vip); 265 ip->i_mapping->a_ops = &vxfs_aops; 266 } 267 return (ip); 268 } 269 270 /** 271 * vxfs_put_fake_inode - free faked inode 272 * *ip: VFS inode 273 * 274 * Description: 275 * vxfs_put_fake_inode frees all data associated with @ip. 276 */ 277 void 278 vxfs_put_fake_inode(struct inode *ip) 279 { 280 iput(ip); 281 } 282 283 /** 284 * vxfs_iget - get an inode 285 * @sbp: the superblock to get the inode for 286 * @ino: the number of the inode to get 287 * 288 * Description: 289 * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills 290 * in all relevant fields in the new inode. 291 */ 292 struct inode * 293 vxfs_iget(struct super_block *sbp, ino_t ino) 294 { 295 struct vxfs_inode_info *vip; 296 const struct address_space_operations *aops; 297 struct inode *ip; 298 299 ip = iget_locked(sbp, ino); 300 if (!ip) 301 return ERR_PTR(-ENOMEM); 302 if (!(ip->i_state & I_NEW)) 303 return ip; 304 305 vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist); 306 if (IS_ERR(vip)) { 307 iget_failed(ip); 308 return ERR_CAST(vip); 309 } 310 311 vxfs_iinit(ip, vip); 312 313 if (VXFS_ISIMMED(vip)) 314 aops = &vxfs_immed_aops; 315 else 316 aops = &vxfs_aops; 317 318 if (S_ISREG(ip->i_mode)) { 319 ip->i_fop = &generic_ro_fops; 320 ip->i_mapping->a_ops = aops; 321 } else if (S_ISDIR(ip->i_mode)) { 322 ip->i_op = &vxfs_dir_inode_ops; 323 ip->i_fop = &vxfs_dir_operations; 324 ip->i_mapping->a_ops = aops; 325 } else if (S_ISLNK(ip->i_mode)) { 326 if (!VXFS_ISIMMED(vip)) { 327 ip->i_op = &page_symlink_inode_operations; 328 ip->i_mapping->a_ops = &vxfs_aops; 329 } else { 330 ip->i_op = &vxfs_immed_symlink_iops; 331 vip->vii_immed.vi_immed[ip->i_size] = '\0'; 332 } 333 } else 334 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev)); 335 336 unlock_new_inode(ip); 337 return ip; 338 } 339 340 static void vxfs_i_callback(struct rcu_head *head) 341 { 342 struct inode *inode = container_of(head, struct inode, i_rcu); 343 kmem_cache_free(vxfs_inode_cachep, inode->i_private); 344 } 345 346 /** 347 * vxfs_evict_inode - remove inode from main memory 348 * @ip: inode to discard. 349 * 350 * Description: 351 * vxfs_evict_inode() is called on the final iput and frees the private 352 * inode area. 353 */ 354 void 355 vxfs_evict_inode(struct inode *ip) 356 { 357 truncate_inode_pages_final(&ip->i_data); 358 clear_inode(ip); 359 call_rcu(&ip->i_rcu, vxfs_i_callback); 360 } 361