Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/freevxfs/vxfs_inode.c
Version:
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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 #ident "$Id: vxfs_inode.c,v 1.42 2002/01/02 23:51:36 hch Exp hch $" 31 32 /* 33 * Veritas filesystem driver - inode routines. 34 */ 35 #include <linux/fs.h> 36 #include <linux/pagemap.h> 37 #include <linux/kernel.h> 38 #include <linux/slab.h> 39 40 #include "vxfs.h" 41 #include "vxfs_inode.h" 42 #include "vxfs_extern.h" 43 44 45 extern struct address_space_operations vxfs_aops; 46 extern struct address_space_operations vxfs_immed_aops; 47 48 extern struct inode_operations vxfs_immed_symlink_iops; 49 50 static struct file_operations vxfs_file_operations = { 51 .open = generic_file_open, 52 .llseek = generic_file_llseek, 53 .read = generic_file_read, 54 .mmap = generic_file_mmap, 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", 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 = vip->vii_atime; 245 ip->i_ctime = vip->vii_ctime; 246 ip->i_mtime = vip->vii_mtime; 247 248 ip->i_blksize = PAGE_SIZE; 249 ip->i_blocks = vip->vii_blocks; 250 ip->i_generation = vip->vii_gen; 251 252 ip->u.generic_ip = (void *)vip; 253 254 } 255 256 /** 257 * vxfs_get_fake_inode - get fake inode structure 258 * @sbp: filesystem superblock 259 * @vip: fspriv inode 260 * 261 * Description: 262 * vxfs_fake_inode gets a fake inode (not in the inode hash) for a 263 * superblock, vxfs_inode pair. 264 * Returns the filled VFS inode. 265 */ 266 struct inode * 267 vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip) 268 { 269 struct inode *ip = NULL; 270 271 if ((ip = new_inode(sbp))) { 272 vxfs_iinit(ip, vip); 273 ip->i_mapping->a_ops = &vxfs_aops; 274 } 275 return (ip); 276 } 277 278 /** 279 * vxfs_put_fake_inode - free faked inode 280 * *ip: VFS inode 281 * 282 * Description: 283 * vxfs_put_fake_inode frees all data asssociated with @ip. 284 */ 285 void 286 vxfs_put_fake_inode(struct inode *ip) 287 { 288 iput(ip); 289 } 290 291 /** 292 * vxfs_read_inode - fill in inode information 293 * @ip: inode pointer to fill 294 * 295 * Description: 296 * vxfs_read_inode reads the disk inode for @ip and fills 297 * in all relevant fields in @ip. 298 */ 299 void 300 vxfs_read_inode(struct inode *ip) 301 { 302 struct super_block *sbp = ip->i_sb; 303 struct vxfs_inode_info *vip; 304 struct address_space_operations *aops; 305 ino_t ino = ip->i_ino; 306 307 if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist))) 308 return; 309 310 vxfs_iinit(ip, vip); 311 312 if (VXFS_ISIMMED(vip)) 313 aops = &vxfs_immed_aops; 314 else 315 aops = &vxfs_aops; 316 317 if (S_ISREG(ip->i_mode)) { 318 ip->i_fop = &vxfs_file_operations; 319 ip->i_mapping->a_ops = aops; 320 } else if (S_ISDIR(ip->i_mode)) { 321 ip->i_op = &vxfs_dir_inode_ops; 322 ip->i_fop = &vxfs_dir_operations; 323 ip->i_mapping->a_ops = aops; 324 } else if (S_ISLNK(ip->i_mode)) { 325 if (!VXFS_ISIMMED(vip)) { 326 ip->i_op = &page_symlink_inode_operations; 327 ip->i_mapping->a_ops = &vxfs_aops; 328 } else 329 ip->i_op = &vxfs_immed_symlink_iops; 330 } else 331 init_special_inode(ip, ip->i_mode, vip->vii_rdev); 332 333 return; 334 } 335 336 /** 337 * vxfs_put_inode - remove inode from main memory 338 * @ip: inode to discard. 339 * 340 * Description: 341 * vxfs_put_inode() is called on each iput. If we are the last 342 * link in memory, free the fspriv inode area. 343 */ 344 void 345 vxfs_put_inode(struct inode *ip) 346 { 347 if (atomic_read(&ip->i_count) == 1) 348 kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip); 349 }
Cache object: 09028b53a4d5e92715a759d7532119fd
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