blob: 9672d2facffeeaecc0973923b00ed116a6272134 [file] [log] [blame]
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
49static struct file_operations vxfs_file_operations = {
50 .open = generic_file_open,
51 .llseek = generic_file_llseek,
52 .read = generic_file_read,
53 .mmap = generic_file_mmap,
54 .sendfile = generic_file_sendfile,
55};
56
57
58kmem_cache_t *vxfs_inode_cachep;
59
60
61#ifdef DIAGNOSTIC
62/*
63 * Dump inode contents (partially).
64 */
65void
66vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
67{
68 printk(KERN_DEBUG "\n\n");
69 if (ino)
70 printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
71 else
72 printk(KERN_DEBUG "dumping unknown vxfs inode\n");
73
74 printk(KERN_DEBUG "---------------------------\n");
75 printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
76 printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
77 vip->vii_nlink, vip->vii_uid, vip->vii_gid);
78 printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
79 vip->vii_size, vip->vii_blocks);
80 printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
81}
82#endif
83
84
85/**
86 * vxfs_blkiget - find inode based on extent #
87 * @sbp: superblock of the filesystem we search in
88 * @extent: number of the extent to search
89 * @ino: inode number to search
90 *
91 * Description:
92 * vxfs_blkiget searches inode @ino in the filesystem described by
93 * @sbp in the extent @extent.
94 * Returns the matching VxFS inode on success, else a NULL pointer.
95 *
96 * NOTE:
97 * While __vxfs_iget uses the pagecache vxfs_blkiget uses the
98 * buffercache. This function should not be used outside the
99 * read_super() method, otherwise the data may be incoherent.
100 */
101struct vxfs_inode_info *
102vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
103{
104 struct buffer_head *bp;
105 u_long block, offset;
106
107 block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
108 offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
109 bp = sb_bread(sbp, block);
110
111 if (buffer_mapped(bp)) {
112 struct vxfs_inode_info *vip;
113 struct vxfs_dinode *dip;
114
115 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))
116 goto fail;
117 dip = (struct vxfs_dinode *)(bp->b_data + offset);
118 memcpy(vip, dip, sizeof(*vip));
119#ifdef DIAGNOSTIC
120 vxfs_dumpi(vip, ino);
121#endif
122 brelse(bp);
123 return (vip);
124 }
125
126fail:
127 printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
128 brelse(bp);
129 return NULL;
130}
131
132/**
133 * __vxfs_iget - generic find inode facility
134 * @sbp: VFS superblock
135 * @ino: inode number
136 * @ilistp: inode list
137 *
138 * Description:
139 * Search the for inode number @ino in the filesystem
140 * described by @sbp. Use the specified inode table (@ilistp).
141 * Returns the matching VxFS inode on success, else a NULL pointer.
142 */
143static struct vxfs_inode_info *
144__vxfs_iget(ino_t ino, struct inode *ilistp)
145{
146 struct page *pp;
147 u_long offset;
148
149 offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
150 pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
151
152 if (!IS_ERR(pp)) {
153 struct vxfs_inode_info *vip;
154 struct vxfs_dinode *dip;
155 caddr_t kaddr = (char *)page_address(pp);
156
157 if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))
158 goto fail;
159 dip = (struct vxfs_dinode *)(kaddr + offset);
160 memcpy(vip, dip, sizeof(*vip));
161#ifdef DIAGNOSTIC
162 vxfs_dumpi(vip, ino);
163#endif
164 vxfs_put_page(pp);
165 return (vip);
166 }
167
168 printk(KERN_WARNING "vxfs: error on page %p\n", pp);
169 return NULL;
170
171fail:
172 printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
173 vxfs_put_page(pp);
174 return NULL;
175}
176
177/**
178 * vxfs_stiget - find inode using the structural inode list
179 * @sbp: VFS superblock
180 * @ino: inode #
181 *
182 * Description:
183 * Find inode @ino in the filesystem described by @sbp using
184 * the structural inode list.
185 * Returns the matching VxFS inode on success, else a NULL pointer.
186 */
187struct vxfs_inode_info *
188vxfs_stiget(struct super_block *sbp, ino_t ino)
189{
190 return __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
191}
192
193/**
194 * vxfs_transmod - mode for a VxFS inode
195 * @vip: VxFS inode
196 *
197 * Description:
198 * vxfs_transmod returns a Linux mode_t for a given
199 * VxFS inode structure.
200 */
201static __inline__ mode_t
202vxfs_transmod(struct vxfs_inode_info *vip)
203{
204 mode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK;
205
206 if (VXFS_ISFIFO(vip))
207 ret |= S_IFIFO;
208 if (VXFS_ISCHR(vip))
209 ret |= S_IFCHR;
210 if (VXFS_ISDIR(vip))
211 ret |= S_IFDIR;
212 if (VXFS_ISBLK(vip))
213 ret |= S_IFBLK;
214 if (VXFS_ISLNK(vip))
215 ret |= S_IFLNK;
216 if (VXFS_ISREG(vip))
217 ret |= S_IFREG;
218 if (VXFS_ISSOC(vip))
219 ret |= S_IFSOCK;
220
221 return (ret);
222}
223
224/**
225 * vxfs_iinit- helper to fill inode fields
226 * @ip: VFS inode
227 * @vip: VxFS inode
228 *
229 * Description:
230 * vxfs_instino is a helper function to fill in all relevant
231 * fields in @ip from @vip.
232 */
233static void
234vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
235{
236
237 ip->i_mode = vxfs_transmod(vip);
238 ip->i_uid = (uid_t)vip->vii_uid;
239 ip->i_gid = (gid_t)vip->vii_gid;
240
241 ip->i_nlink = vip->vii_nlink;
242 ip->i_size = vip->vii_size;
243
244 ip->i_atime.tv_sec = vip->vii_atime;
245 ip->i_ctime.tv_sec = vip->vii_ctime;
246 ip->i_mtime.tv_sec = vip->vii_mtime;
247 ip->i_atime.tv_nsec = 0;
248 ip->i_ctime.tv_nsec = 0;
249 ip->i_mtime.tv_nsec = 0;
250
251 ip->i_blksize = PAGE_SIZE;
252 ip->i_blocks = vip->vii_blocks;
253 ip->i_generation = vip->vii_gen;
254
255 ip->u.generic_ip = (void *)vip;
256
257}
258
259/**
260 * vxfs_get_fake_inode - get fake inode structure
261 * @sbp: filesystem superblock
262 * @vip: fspriv inode
263 *
264 * Description:
265 * vxfs_fake_inode gets a fake inode (not in the inode hash) for a
266 * superblock, vxfs_inode pair.
267 * Returns the filled VFS inode.
268 */
269struct inode *
270vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
271{
272 struct inode *ip = NULL;
273
274 if ((ip = new_inode(sbp))) {
275 vxfs_iinit(ip, vip);
276 ip->i_mapping->a_ops = &vxfs_aops;
277 }
278 return (ip);
279}
280
281/**
282 * vxfs_put_fake_inode - free faked inode
283 * *ip: VFS inode
284 *
285 * Description:
286 * vxfs_put_fake_inode frees all data asssociated with @ip.
287 */
288void
289vxfs_put_fake_inode(struct inode *ip)
290{
291 iput(ip);
292}
293
294/**
295 * vxfs_read_inode - fill in inode information
296 * @ip: inode pointer to fill
297 *
298 * Description:
299 * vxfs_read_inode reads the disk inode for @ip and fills
300 * in all relevant fields in @ip.
301 */
302void
303vxfs_read_inode(struct inode *ip)
304{
305 struct super_block *sbp = ip->i_sb;
306 struct vxfs_inode_info *vip;
307 struct address_space_operations *aops;
308 ino_t ino = ip->i_ino;
309
310 if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist)))
311 return;
312
313 vxfs_iinit(ip, vip);
314
315 if (VXFS_ISIMMED(vip))
316 aops = &vxfs_immed_aops;
317 else
318 aops = &vxfs_aops;
319
320 if (S_ISREG(ip->i_mode)) {
321 ip->i_fop = &vxfs_file_operations;
322 ip->i_mapping->a_ops = aops;
323 } else if (S_ISDIR(ip->i_mode)) {
324 ip->i_op = &vxfs_dir_inode_ops;
325 ip->i_fop = &vxfs_dir_operations;
326 ip->i_mapping->a_ops = aops;
327 } else if (S_ISLNK(ip->i_mode)) {
328 if (!VXFS_ISIMMED(vip)) {
329 ip->i_op = &page_symlink_inode_operations;
330 ip->i_mapping->a_ops = &vxfs_aops;
331 } else
332 ip->i_op = &vxfs_immed_symlink_iops;
333 } else
334 init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
335
336 return;
337}
338
339/**
340 * vxfs_clear_inode - remove inode from main memory
341 * @ip: inode to discard.
342 *
343 * Description:
344 * vxfs_clear_inode() is called on the final iput and frees the private
345 * inode area.
346 */
347void
348vxfs_clear_inode(struct inode *ip)
349{
350 kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip);
351}