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1da177e4 LT |
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 | ||
e18b890b | 44 | struct kmem_cache *vxfs_inode_cachep; |
1da177e4 LT |
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 | ||
82f703bb | 97 | if (bp && buffer_mapped(bp)) { |
1da177e4 LT |
98 | struct vxfs_inode_info *vip; |
99 | struct vxfs_dinode *dip; | |
100 | ||
e94b1766 | 101 | if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) |
1da177e4 LT |
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). | |
d0b07948 | 127 | * Returns the matching VxFS inode on success, else an error code. |
1da177e4 LT |
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 | ||
e94b1766 | 143 | if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL))) |
1da177e4 LT |
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); | |
d0b07948 | 155 | return ERR_CAST(pp); |
1da177e4 LT |
156 | |
157 | fail: | |
158 | printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino); | |
159 | vxfs_put_page(pp); | |
d0b07948 | 160 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
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 | { | |
d0b07948 DH |
176 | struct vxfs_inode_info *vip; |
177 | ||
178 | vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist); | |
179 | return IS_ERR(vip) ? NULL : vip; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
240 | ip->i_blocks = vip->vii_blocks; |
241 | ip->i_generation = vip->vii_gen; | |
242 | ||
8e18e294 | 243 | ip->i_private = vip; |
1da177e4 LT |
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))) { | |
85fe4025 | 263 | ip->i_ino = get_next_ino(); |
1da177e4 LT |
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: | |
70f23fd6 | 275 | * vxfs_put_fake_inode frees all data associated with @ip. |
1da177e4 LT |
276 | */ |
277 | void | |
278 | vxfs_put_fake_inode(struct inode *ip) | |
279 | { | |
280 | iput(ip); | |
281 | } | |
282 | ||
283 | /** | |
d0b07948 DH |
284 | * vxfs_iget - get an inode |
285 | * @sbp: the superblock to get the inode for | |
286 | * @ino: the number of the inode to get | |
1da177e4 LT |
287 | * |
288 | * Description: | |
d0b07948 DH |
289 | * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills |
290 | * in all relevant fields in the new inode. | |
1da177e4 | 291 | */ |
d0b07948 DH |
292 | struct inode * |
293 | vxfs_iget(struct super_block *sbp, ino_t ino) | |
1da177e4 | 294 | { |
1da177e4 | 295 | struct vxfs_inode_info *vip; |
f5e54d6e | 296 | const struct address_space_operations *aops; |
d0b07948 DH |
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 | } | |
1da177e4 LT |
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)) { | |
dc487002 | 319 | ip->i_fop = &generic_ro_fops; |
1da177e4 LT |
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; | |
a63d0ff3 | 329 | } else { |
1da177e4 | 330 | ip->i_op = &vxfs_immed_symlink_iops; |
a63d0ff3 DG |
331 | vip->vii_immed.vi_immed[ip->i_size] = '\0'; |
332 | } | |
1da177e4 LT |
333 | } else |
334 | init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev)); | |
335 | ||
d0b07948 DH |
336 | unlock_new_inode(ip); |
337 | return ip; | |
1da177e4 LT |
338 | } |
339 | ||
fa0d7e3d NP |
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 | ||
1da177e4 | 347 | /** |
b57922d9 | 348 | * vxfs_evict_inode - remove inode from main memory |
1da177e4 LT |
349 | * @ip: inode to discard. |
350 | * | |
351 | * Description: | |
b57922d9 | 352 | * vxfs_evict_inode() is called on the final iput and frees the private |
1da177e4 LT |
353 | * inode area. |
354 | */ | |
355 | void | |
b57922d9 | 356 | vxfs_evict_inode(struct inode *ip) |
1da177e4 | 357 | { |
b57922d9 AV |
358 | truncate_inode_pages(&ip->i_data, 0); |
359 | end_writeback(ip); | |
fa0d7e3d | 360 | call_rcu(&ip->i_rcu, vxfs_i_callback); |
1da177e4 | 361 | } |