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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 | ||
f5e54d6e CH |
44 | extern const struct address_space_operations vxfs_aops; |
45 | extern const struct address_space_operations vxfs_immed_aops; | |
1da177e4 LT |
46 | |
47 | extern struct inode_operations vxfs_immed_symlink_iops; | |
48 | ||
1da177e4 LT |
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 | ||
8e18e294 | 246 | ip->i_private = vip; |
1da177e4 LT |
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; | |
f5e54d6e | 298 | const struct address_space_operations *aops; |
1da177e4 LT |
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)) { | |
dc487002 | 312 | ip->i_fop = &generic_ro_fops; |
1da177e4 LT |
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 | { | |
8e18e294 | 341 | kmem_cache_free(vxfs_inode_cachep, ip->i_private); |
1da177e4 | 342 | } |