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 kmem_cache_t *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, SLAB_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, SLAB_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_blksize = PAGE_SIZE; 243 ip->i_blocks = vip->vii_blocks; 244 ip->i_generation = vip->vii_gen; 245 246 ip->u.generic_ip = (void *)vip; 247 248 } 249 250 /** 251 * vxfs_get_fake_inode - get fake inode structure 252 * @sbp: filesystem superblock 253 * @vip: fspriv inode 254 * 255 * Description: 256 * vxfs_fake_inode gets a fake inode (not in the inode hash) for a 257 * superblock, vxfs_inode pair. 258 * Returns the filled VFS inode. 259 */ 260 struct inode * 261 vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip) 262 { 263 struct inode *ip = NULL; 264 265 if ((ip = new_inode(sbp))) { 266 vxfs_iinit(ip, vip); 267 ip->i_mapping->a_ops = &vxfs_aops; 268 } 269 return (ip); 270 } 271 272 /** 273 * vxfs_put_fake_inode - free faked inode 274 * *ip: VFS inode 275 * 276 * Description: 277 * vxfs_put_fake_inode frees all data asssociated with @ip. 278 */ 279 void 280 vxfs_put_fake_inode(struct inode *ip) 281 { 282 iput(ip); 283 } 284 285 /** 286 * vxfs_read_inode - fill in inode information 287 * @ip: inode pointer to fill 288 * 289 * Description: 290 * vxfs_read_inode reads the disk inode for @ip and fills 291 * in all relevant fields in @ip. 292 */ 293 void 294 vxfs_read_inode(struct inode *ip) 295 { 296 struct super_block *sbp = ip->i_sb; 297 struct vxfs_inode_info *vip; 298 struct address_space_operations *aops; 299 ino_t ino = ip->i_ino; 300 301 if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist))) 302 return; 303 304 vxfs_iinit(ip, vip); 305 306 if (VXFS_ISIMMED(vip)) 307 aops = &vxfs_immed_aops; 308 else 309 aops = &vxfs_aops; 310 311 if (S_ISREG(ip->i_mode)) { 312 ip->i_fop = &generic_ro_fops; 313 ip->i_mapping->a_ops = aops; 314 } else if (S_ISDIR(ip->i_mode)) { 315 ip->i_op = &vxfs_dir_inode_ops; 316 ip->i_fop = &vxfs_dir_operations; 317 ip->i_mapping->a_ops = aops; 318 } else if (S_ISLNK(ip->i_mode)) { 319 if (!VXFS_ISIMMED(vip)) { 320 ip->i_op = &page_symlink_inode_operations; 321 ip->i_mapping->a_ops = &vxfs_aops; 322 } else 323 ip->i_op = &vxfs_immed_symlink_iops; 324 } else 325 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev)); 326 327 return; 328 } 329 330 /** 331 * vxfs_clear_inode - remove inode from main memory 332 * @ip: inode to discard. 333 * 334 * Description: 335 * vxfs_clear_inode() is called on the final iput and frees the private 336 * inode area. 337 */ 338 void 339 vxfs_clear_inode(struct inode *ip) 340 { 341 kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip); 342 } 343