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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
44extern struct address_space_operations vxfs_aops;
45extern struct address_space_operations vxfs_immed_aops;
46
47extern struct inode_operations vxfs_immed_symlink_iops;
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049kmem_cache_t *vxfs_inode_cachep;
50
51
52#ifdef DIAGNOSTIC
53/*
54 * Dump inode contents (partially).
55 */
56void
57vxfs_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 */
92struct vxfs_inode_info *
93vxfs_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
117fail:
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 */
134static 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
162fail:
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 */
178struct vxfs_inode_info *
179vxfs_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 */
192static __inline__ mode_t
193vxfs_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 */
224static void
225vxfs_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
246 ip->u.generic_ip = (void *)vip;
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 */
260struct inode *
261vxfs_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 */
279void
280vxfs_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 */
293void
294vxfs_read_inode(struct inode *ip)
295{
296 struct super_block *sbp = ip->i_sb;
297 struct vxfs_inode_info *vip;
298 struct address_space_operations *aops;
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)) {
Christoph Hellwigdc487002005-11-07 00:59:45 -0800312 ip->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 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 */
338void
339vxfs_clear_inode(struct inode *ip)
340{
341 kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip);
342}