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 Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 44 | struct kmem_cache *vxfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Dmitriy Monakhov | 82f703b | 2007-05-08 00:24:34 -0700 | [diff] [blame] | 97 | if (bp && buffer_mapped(bp)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | struct vxfs_inode_info *vip; |
| 99 | struct vxfs_dinode *dip; |
| 100 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 101 | if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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). |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 127 | * Returns the matching VxFS inode on success, else an error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 143 | if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 155 | return ERR_CAST(pp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
| 157 | fail: |
| 158 | printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino); |
| 159 | vxfs_put_page(pp); |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 160 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 176 | struct vxfs_inode_info *vip; |
| 177 | |
| 178 | vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist); |
| 179 | return IS_ERR(vip) ? NULL : vip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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__ mode_t |
| 191 | vxfs_transmod(struct vxfs_inode_info *vip) |
| 192 | { |
| 193 | mode_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 | ip->i_uid = (uid_t)vip->vii_uid; |
| 228 | ip->i_gid = (gid_t)vip->vii_gid; |
| 229 | |
| 230 | ip->i_nlink = 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | ip->i_blocks = vip->vii_blocks; |
| 241 | ip->i_generation = vip->vii_gen; |
| 242 | |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 243 | ip->i_private = vip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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))) { |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 263 | ip->i_ino = get_next_ino(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Justin P. Mattock | 70f23fd | 2011-05-10 10:16:21 +0200 | [diff] [blame] | 275 | * vxfs_put_fake_inode frees all data associated with @ip. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | */ |
| 277 | void |
| 278 | vxfs_put_fake_inode(struct inode *ip) |
| 279 | { |
| 280 | iput(ip); |
| 281 | } |
| 282 | |
| 283 | /** |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 284 | * vxfs_iget - get an inode |
| 285 | * @sbp: the superblock to get the inode for |
| 286 | * @ino: the number of the inode to get |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | * |
| 288 | * Description: |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 289 | * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills |
| 290 | * in all relevant fields in the new inode. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | */ |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 292 | struct inode * |
| 293 | vxfs_iget(struct super_block *sbp, ino_t ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | struct vxfs_inode_info *vip; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 296 | const struct address_space_operations *aops; |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 297 | struct inode *ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)) { |
Christoph Hellwig | dc48700 | 2005-11-07 00:59:45 -0800 | [diff] [blame] | 319 | ip->i_fop = &generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Duane Griffin | a63d0ff | 2008-12-19 20:47:17 +0000 | [diff] [blame] | 329 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | ip->i_op = &vxfs_immed_symlink_iops; |
Duane Griffin | a63d0ff | 2008-12-19 20:47:17 +0000 | [diff] [blame] | 331 | vip->vii_immed.vi_immed[ip->i_size] = '\0'; |
| 332 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } else |
| 334 | init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev)); |
| 335 | |
David Howells | d0b0794 | 2008-02-07 00:15:39 -0800 | [diff] [blame] | 336 | unlock_new_inode(ip); |
| 337 | return ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 340 | static void vxfs_i_callback(struct rcu_head *head) |
| 341 | { |
| 342 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 343 | INIT_LIST_HEAD(&inode->i_dentry); |
| 344 | kmem_cache_free(vxfs_inode_cachep, inode->i_private); |
| 345 | } |
| 346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /** |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 348 | * vxfs_evict_inode - remove inode from main memory |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | * @ip: inode to discard. |
| 350 | * |
| 351 | * Description: |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 352 | * vxfs_evict_inode() is called on the final iput and frees the private |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | * inode area. |
| 354 | */ |
| 355 | void |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 356 | vxfs_evict_inode(struct inode *ip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | { |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 358 | truncate_inode_pages(&ip->i_data, 0); |
| 359 | end_writeback(ip); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 360 | call_rcu(&ip->i_rcu, vxfs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |