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
44 struct kmem_cache *vxfs_inode_cachep;
45
46
47 #ifdef DIAGNOSTIC
48 /*
49 * Dump inode contents (partially).
50 */
51 void
vxfs_dumpi(struct vxfs_inode_info * vip,ino_t ino)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 *
vxfs_blkiget(struct super_block * sbp,u_long extent,ino_t ino)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
97 if (bp && buffer_mapped(bp)) {
98 struct vxfs_inode_info *vip;
99 struct vxfs_dinode *dip;
100
101 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
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).
127 * Returns the matching VxFS inode on success, else an error code.
128 */
129 static struct vxfs_inode_info *
__vxfs_iget(ino_t ino,struct inode * ilistp)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
143 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
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);
155 return ERR_CAST(pp);
156
157 fail:
158 printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
159 vxfs_put_page(pp);
160 return ERR_PTR(-ENOMEM);
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 *
vxfs_stiget(struct super_block * sbp,ino_t ino)174 vxfs_stiget(struct super_block *sbp, ino_t ino)
175 {
176 struct vxfs_inode_info *vip;
177
178 vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
179 return IS_ERR(vip) ? NULL : vip;
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
vxfs_transmod(struct vxfs_inode_info * vip)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
vxfs_iinit(struct inode * ip,struct vxfs_inode_info * vip)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
240 ip->i_blocks = vip->vii_blocks;
241 ip->i_generation = vip->vii_gen;
242
243 ip->i_private = vip;
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 *
vxfs_get_fake_inode(struct super_block * sbp,struct vxfs_inode_info * vip)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))) {
263 ip->i_ino = get_next_ino();
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:
275 * vxfs_put_fake_inode frees all data asssociated with @ip.
276 */
277 void
vxfs_put_fake_inode(struct inode * ip)278 vxfs_put_fake_inode(struct inode *ip)
279 {
280 iput(ip);
281 }
282
283 /**
284 * vxfs_iget - get an inode
285 * @sbp: the superblock to get the inode for
286 * @ino: the number of the inode to get
287 *
288 * Description:
289 * vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
290 * in all relevant fields in the new inode.
291 */
292 struct inode *
vxfs_iget(struct super_block * sbp,ino_t ino)293 vxfs_iget(struct super_block *sbp, ino_t ino)
294 {
295 struct vxfs_inode_info *vip;
296 const struct address_space_operations *aops;
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 }
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)) {
319 ip->i_fop = &generic_ro_fops;
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;
329 } else {
330 ip->i_op = &vxfs_immed_symlink_iops;
331 vip->vii_immed.vi_immed[ip->i_size] = '\0';
332 }
333 } else
334 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
335
336 unlock_new_inode(ip);
337 return ip;
338 }
339
vxfs_i_callback(struct rcu_head * head)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
347 /**
348 * vxfs_evict_inode - remove inode from main memory
349 * @ip: inode to discard.
350 *
351 * Description:
352 * vxfs_evict_inode() is called on the final iput and frees the private
353 * inode area.
354 */
355 void
vxfs_evict_inode(struct inode * ip)356 vxfs_evict_inode(struct inode *ip)
357 {
358 truncate_inode_pages(&ip->i_data, 0);
359 end_writeback(ip);
360 call_rcu(&ip->i_rcu, vxfs_i_callback);
361 }
362