Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 44 | extern const struct address_space_operations vxfs_aops; |
| 45 | extern const struct address_space_operations vxfs_immed_aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame^] | 47 | extern const struct inode_operations vxfs_immed_symlink_iops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 49 | struct kmem_cache *vxfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 106 | if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 148 | if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | ip->i_blocks = vip->vii_blocks; |
| 243 | ip->i_generation = vip->vii_gen; |
| 244 | |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 245 | ip->i_private = vip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * vxfs_get_fake_inode - get fake inode structure |
| 251 | * @sbp: filesystem superblock |
| 252 | * @vip: fspriv inode |
| 253 | * |
| 254 | * Description: |
| 255 | * vxfs_fake_inode gets a fake inode (not in the inode hash) for a |
| 256 | * superblock, vxfs_inode pair. |
| 257 | * Returns the filled VFS inode. |
| 258 | */ |
| 259 | struct inode * |
| 260 | vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip) |
| 261 | { |
| 262 | struct inode *ip = NULL; |
| 263 | |
| 264 | if ((ip = new_inode(sbp))) { |
| 265 | vxfs_iinit(ip, vip); |
| 266 | ip->i_mapping->a_ops = &vxfs_aops; |
| 267 | } |
| 268 | return (ip); |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * vxfs_put_fake_inode - free faked inode |
| 273 | * *ip: VFS inode |
| 274 | * |
| 275 | * Description: |
| 276 | * vxfs_put_fake_inode frees all data asssociated with @ip. |
| 277 | */ |
| 278 | void |
| 279 | vxfs_put_fake_inode(struct inode *ip) |
| 280 | { |
| 281 | iput(ip); |
| 282 | } |
| 283 | |
| 284 | /** |
| 285 | * vxfs_read_inode - fill in inode information |
| 286 | * @ip: inode pointer to fill |
| 287 | * |
| 288 | * Description: |
| 289 | * vxfs_read_inode reads the disk inode for @ip and fills |
| 290 | * in all relevant fields in @ip. |
| 291 | */ |
| 292 | void |
| 293 | vxfs_read_inode(struct inode *ip) |
| 294 | { |
| 295 | struct super_block *sbp = ip->i_sb; |
| 296 | struct vxfs_inode_info *vip; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 297 | const struct address_space_operations *aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | ino_t ino = ip->i_ino; |
| 299 | |
| 300 | if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist))) |
| 301 | return; |
| 302 | |
| 303 | vxfs_iinit(ip, vip); |
| 304 | |
| 305 | if (VXFS_ISIMMED(vip)) |
| 306 | aops = &vxfs_immed_aops; |
| 307 | else |
| 308 | aops = &vxfs_aops; |
| 309 | |
| 310 | if (S_ISREG(ip->i_mode)) { |
Christoph Hellwig | dc48700 | 2005-11-07 00:59:45 -0800 | [diff] [blame] | 311 | ip->i_fop = &generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | ip->i_mapping->a_ops = aops; |
| 313 | } else if (S_ISDIR(ip->i_mode)) { |
| 314 | ip->i_op = &vxfs_dir_inode_ops; |
| 315 | ip->i_fop = &vxfs_dir_operations; |
| 316 | ip->i_mapping->a_ops = aops; |
| 317 | } else if (S_ISLNK(ip->i_mode)) { |
| 318 | if (!VXFS_ISIMMED(vip)) { |
| 319 | ip->i_op = &page_symlink_inode_operations; |
| 320 | ip->i_mapping->a_ops = &vxfs_aops; |
| 321 | } else |
| 322 | ip->i_op = &vxfs_immed_symlink_iops; |
| 323 | } else |
| 324 | init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev)); |
| 325 | |
| 326 | return; |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * vxfs_clear_inode - remove inode from main memory |
| 331 | * @ip: inode to discard. |
| 332 | * |
| 333 | * Description: |
| 334 | * vxfs_clear_inode() is called on the final iput and frees the private |
| 335 | * inode area. |
| 336 | */ |
| 337 | void |
| 338 | vxfs_clear_inode(struct inode *ip) |
| 339 | { |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 340 | kmem_cache_free(vxfs_inode_cachep, ip->i_private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } |