]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - fs/bfs/inode.c
bfs: assorted cleanups
[mirror_ubuntu-bionic-kernel.git] / fs / bfs / inode.c
CommitLineData
1da177e4
LT
1/*
2 * fs/bfs/inode.c
3 * BFS superblock and inode operations.
69688262 4 * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
1da177e4 5 * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
fac92bec
AS
6 *
7 * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
1da177e4
LT
8 */
9
10#include <linux/module.h>
11#include <linux/mm.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/fs.h>
15#include <linux/smp_lock.h>
16#include <linux/buffer_head.h>
17#include <linux/vfs.h>
18#include <asm/uaccess.h>
19#include "bfs.h"
20
69688262 21MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
1da177e4
LT
22MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
23MODULE_LICENSE("GPL");
24
25#undef DEBUG
26
27#ifdef DEBUG
28#define dprintf(x...) printf(x)
29#else
30#define dprintf(x...)
31#endif
32
f433dc56 33void dump_imap(const char *prefix, struct super_block *s);
1da177e4 34
e33ab086 35struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
1da177e4 36{
f433dc56 37 struct bfs_inode *di;
e33ab086 38 struct inode *inode;
f433dc56 39 struct buffer_head *bh;
1da177e4
LT
40 int block, off;
41
e33ab086
DH
42 inode = iget_locked(sb, ino);
43 if (IS_ERR(inode))
44 return ERR_PTR(-ENOMEM);
45 if (!(inode->i_state & I_NEW))
46 return inode;
47
f433dc56 48 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
1da177e4 49 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
e33ab086 50 goto error;
1da177e4
LT
51 }
52
f433dc56 53 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4
LT
54 bh = sb_bread(inode->i_sb, block);
55 if (!bh) {
f433dc56
DV
56 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
57 ino);
e33ab086 58 goto error;
1da177e4
LT
59 }
60
61 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
62 di = (struct bfs_inode *)bh->b_data + off;
63
f433dc56 64 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
fac92bec 65 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
1da177e4
LT
66 inode->i_mode |= S_IFDIR;
67 inode->i_op = &bfs_dir_inops;
68 inode->i_fop = &bfs_dir_operations;
fac92bec 69 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
1da177e4
LT
70 inode->i_mode |= S_IFREG;
71 inode->i_op = &bfs_file_inops;
72 inode->i_fop = &bfs_file_operations;
73 inode->i_mapping->a_ops = &bfs_aops;
74 }
75
fac92bec
AS
76 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
77 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
f433dc56 78 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
fac92bec
AS
79 inode->i_uid = le32_to_cpu(di->i_uid);
80 inode->i_gid = le32_to_cpu(di->i_gid);
81 inode->i_nlink = le32_to_cpu(di->i_nlink);
1da177e4
LT
82 inode->i_size = BFS_FILESIZE(di);
83 inode->i_blocks = BFS_FILEBLOCKS(di);
fac92bec
AS
84 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
85 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
86 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
1da177e4
LT
87 inode->i_atime.tv_nsec = 0;
88 inode->i_mtime.tv_nsec = 0;
89 inode->i_ctime.tv_nsec = 0;
1da177e4
LT
90
91 brelse(bh);
e33ab086
DH
92 unlock_new_inode(inode);
93 return inode;
94
95error:
96 iget_failed(inode);
97 return ERR_PTR(-EIO);
1da177e4
LT
98}
99
f433dc56 100static int bfs_write_inode(struct inode *inode, int unused)
1da177e4 101{
fac92bec
AS
102 unsigned int ino = (u16)inode->i_ino;
103 unsigned long i_sblock;
f433dc56
DV
104 struct bfs_inode *di;
105 struct buffer_head *bh;
1da177e4
LT
106 int block, off;
107
fac92bec
AS
108 dprintf("ino=%08x\n", ino);
109
f433dc56 110 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
fac92bec 111 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino);
1da177e4
LT
112 return -EIO;
113 }
114
115 lock_kernel();
f433dc56 116 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4
LT
117 bh = sb_bread(inode->i_sb, block);
118 if (!bh) {
f433dc56
DV
119 printf("Unable to read inode %s:%08x\n",
120 inode->i_sb->s_id, ino);
1da177e4
LT
121 unlock_kernel();
122 return -EIO;
123 }
124
f433dc56 125 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
1da177e4
LT
126 di = (struct bfs_inode *)bh->b_data + off;
127
fac92bec
AS
128 if (ino == BFS_ROOT_INO)
129 di->i_vtype = cpu_to_le32(BFS_VDIR);
1da177e4 130 else
fac92bec
AS
131 di->i_vtype = cpu_to_le32(BFS_VREG);
132
133 di->i_ino = cpu_to_le16(ino);
134 di->i_mode = cpu_to_le32(inode->i_mode);
135 di->i_uid = cpu_to_le32(inode->i_uid);
136 di->i_gid = cpu_to_le32(inode->i_gid);
137 di->i_nlink = cpu_to_le32(inode->i_nlink);
138 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
139 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
140 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
141 i_sblock = BFS_I(inode)->i_sblock;
142 di->i_sblock = cpu_to_le32(i_sblock);
143 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
144 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
1da177e4
LT
145
146 mark_buffer_dirty(bh);
147 brelse(bh);
148 unlock_kernel();
149 return 0;
150}
151
f433dc56 152static void bfs_delete_inode(struct inode *inode)
1da177e4
LT
153{
154 unsigned long ino = inode->i_ino;
f433dc56
DV
155 struct bfs_inode *di;
156 struct buffer_head *bh;
1da177e4 157 int block, off;
f433dc56
DV
158 struct super_block *s = inode->i_sb;
159 struct bfs_sb_info *info = BFS_SB(s);
160 struct bfs_inode_info *bi = BFS_I(inode);
1da177e4 161
fac92bec 162 dprintf("ino=%08lx\n", ino);
1da177e4 163
fef26658
MF
164 truncate_inode_pages(&inode->i_data, 0);
165
f433dc56 166 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) {
fac92bec 167 printf("invalid ino=%08lx\n", ino);
1da177e4
LT
168 return;
169 }
170
171 inode->i_size = 0;
172 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
173 lock_kernel();
174 mark_inode_dirty(inode);
f433dc56
DV
175
176 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
1da177e4
LT
177 bh = sb_bread(s, block);
178 if (!bh) {
f433dc56
DV
179 printf("Unable to read inode %s:%08lx\n",
180 inode->i_sb->s_id, ino);
1da177e4
LT
181 unlock_kernel();
182 return;
183 }
f433dc56
DV
184 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
185 di = (struct bfs_inode *)bh->b_data + off;
186 memset((void *)di, 0, sizeof(struct bfs_inode));
187 mark_buffer_dirty(bh);
188 brelse(bh);
189
fac92bec 190 if (bi->i_dsk_ino) {
7e46aa5c
AV
191 if (bi->i_sblock)
192 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
1da177e4 193 info->si_freei++;
fac92bec 194 clear_bit(ino, info->si_imap);
1da177e4 195 dump_imap("delete_inode", s);
fac92bec 196 }
1da177e4 197
f433dc56
DV
198 /*
199 * If this was the last file, make the previous block
200 * "last block of the last file" even if there is no
201 * real file there, saves us 1 gap.
202 */
203 if (info->si_lf_eblk == bi->i_eblock) {
204 info->si_lf_eblk = bi->i_sblock - 1;
1da177e4
LT
205 mark_buffer_dirty(info->si_sbh);
206 }
207 unlock_kernel();
208 clear_inode(inode);
209}
210
211static void bfs_put_super(struct super_block *s)
212{
213 struct bfs_sb_info *info = BFS_SB(s);
214 brelse(info->si_sbh);
215 kfree(info->si_imap);
216 kfree(info);
217 s->s_fs_info = NULL;
218}
219
726c3342 220static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 221{
726c3342 222 struct super_block *s = dentry->d_sb;
1da177e4
LT
223 struct bfs_sb_info *info = BFS_SB(s);
224 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
225 buf->f_type = BFS_MAGIC;
226 buf->f_bsize = s->s_blocksize;
227 buf->f_blocks = info->si_blocks;
228 buf->f_bfree = buf->f_bavail = info->si_freeb;
229 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
230 buf->f_ffree = info->si_freei;
231 buf->f_fsid.val[0] = (u32)id;
232 buf->f_fsid.val[1] = (u32)(id >> 32);
233 buf->f_namelen = BFS_NAMELEN;
234 return 0;
235}
236
237static void bfs_write_super(struct super_block *s)
238{
239 lock_kernel();
240 if (!(s->s_flags & MS_RDONLY))
241 mark_buffer_dirty(BFS_SB(s)->si_sbh);
242 s->s_dirt = 0;
243 unlock_kernel();
244}
245
f433dc56 246static struct kmem_cache *bfs_inode_cachep;
1da177e4
LT
247
248static struct inode *bfs_alloc_inode(struct super_block *sb)
249{
250 struct bfs_inode_info *bi;
e94b1766 251 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
1da177e4
LT
252 if (!bi)
253 return NULL;
254 return &bi->vfs_inode;
255}
256
257static void bfs_destroy_inode(struct inode *inode)
258{
259 kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
260}
261
4ba9b9d0 262static void init_once(struct kmem_cache *cachep, void *foo)
1da177e4
LT
263{
264 struct bfs_inode_info *bi = foo;
265
a35afb83 266 inode_init_once(&bi->vfs_inode);
1da177e4 267}
20c2df83 268
1da177e4
LT
269static int init_inodecache(void)
270{
271 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
272 sizeof(struct bfs_inode_info),
fffb60f9
PJ
273 0, (SLAB_RECLAIM_ACCOUNT|
274 SLAB_MEM_SPREAD),
20c2df83 275 init_once);
1da177e4
LT
276 if (bfs_inode_cachep == NULL)
277 return -ENOMEM;
278 return 0;
279}
280
281static void destroy_inodecache(void)
282{
1a1d92c1 283 kmem_cache_destroy(bfs_inode_cachep);
1da177e4
LT
284}
285
ee9b6d61 286static const struct super_operations bfs_sops = {
1da177e4
LT
287 .alloc_inode = bfs_alloc_inode,
288 .destroy_inode = bfs_destroy_inode,
1da177e4
LT
289 .write_inode = bfs_write_inode,
290 .delete_inode = bfs_delete_inode,
291 .put_super = bfs_put_super,
292 .write_super = bfs_write_super,
293 .statfs = bfs_statfs,
294};
295
f433dc56 296void dump_imap(const char *prefix, struct super_block *s)
1da177e4 297{
fac92bec 298#ifdef DEBUG
1da177e4
LT
299 int i;
300 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
301
302 if (!tmpbuf)
303 return;
f433dc56
DV
304 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
305 if (i > PAGE_SIZE - 100) break;
1da177e4
LT
306 if (test_bit(i, BFS_SB(s)->si_imap))
307 strcat(tmpbuf, "1");
308 else
309 strcat(tmpbuf, "0");
310 }
f433dc56
DV
311 printf("BFS-fs: %s: lasti=%08lx <%s>\n",
312 prefix, BFS_SB(s)->si_lasti, tmpbuf);
1da177e4
LT
313 free_page((unsigned long)tmpbuf);
314#endif
315}
316
317static int bfs_fill_super(struct super_block *s, void *data, int silent)
318{
f433dc56
DV
319 struct buffer_head *bh;
320 struct bfs_super_block *bfs_sb;
321 struct inode *inode;
fac92bec 322 unsigned i, imap_len;
f433dc56 323 struct bfs_sb_info *info;
e33ab086 324 long ret = -EINVAL;
1da177e4 325
f8314dc6 326 info = kzalloc(sizeof(*info), GFP_KERNEL);
1da177e4
LT
327 if (!info)
328 return -ENOMEM;
329 s->s_fs_info = info;
1da177e4
LT
330
331 sb_set_blocksize(s, BFS_BSIZE);
332
333 bh = sb_bread(s, 0);
334 if(!bh)
335 goto out;
336 bfs_sb = (struct bfs_super_block *)bh->b_data;
fac92bec 337 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
1da177e4
LT
338 if (!silent)
339 printf("No BFS filesystem on %s (magic=%08x)\n",
fac92bec 340 s->s_id, le32_to_cpu(bfs_sb->s_magic));
1da177e4
LT
341 goto out;
342 }
343 if (BFS_UNCLEAN(bfs_sb, s) && !silent)
344 printf("%s is unclean, continuing\n", s->s_id);
345
346 s->s_magic = BFS_MAGIC;
1da177e4 347 info->si_sbh = bh;
f433dc56
DV
348 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
349 sizeof(struct bfs_inode)
350 + BFS_ROOT_INO - 1;
351 imap_len = (info->si_lasti / 8) + 1;
f8314dc6 352 info->si_imap = kzalloc(imap_len, GFP_KERNEL);
1da177e4
LT
353 if (!info->si_imap)
354 goto out;
f433dc56 355 for (i = 0; i < BFS_ROOT_INO; i++)
1da177e4
LT
356 set_bit(i, info->si_imap);
357
358 s->s_op = &bfs_sops;
e33ab086
DH
359 inode = bfs_iget(s, BFS_ROOT_INO);
360 if (IS_ERR(inode)) {
361 ret = PTR_ERR(inode);
1da177e4
LT
362 kfree(info->si_imap);
363 goto out;
364 }
365 s->s_root = d_alloc_root(inode);
366 if (!s->s_root) {
367 iput(inode);
e33ab086 368 ret = -ENOMEM;
1da177e4
LT
369 kfree(info->si_imap);
370 goto out;
371 }
372
f433dc56
DV
373 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
374 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
375 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
1da177e4
LT
376 info->si_freei = 0;
377 info->si_lf_eblk = 0;
c2b513df 378 bh = NULL;
f433dc56 379 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
c2b513df 380 struct bfs_inode *di;
f433dc56 381 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
c2b513df 382 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
75b25b4c 383 unsigned long eblock;
c2b513df
AV
384
385 if (!off) {
386 brelse(bh);
387 bh = sb_bread(s, block);
388 }
389
390 if (!bh)
391 continue;
392
393 di = (struct bfs_inode *)bh->b_data + off;
394
395 if (!di->i_ino) {
1da177e4 396 info->si_freei++;
c2b513df
AV
397 continue;
398 }
399 set_bit(i, info->si_imap);
400 info->si_freeb -= BFS_FILEBLOCKS(di);
401
c2b513df 402 eblock = le32_to_cpu(di->i_eblock);
f433dc56 403 if (eblock > info->si_lf_eblk)
c2b513df 404 info->si_lf_eblk = eblock;
1da177e4 405 }
c2b513df 406 brelse(bh);
1da177e4 407 if (!(s->s_flags & MS_RDONLY)) {
c2b513df 408 mark_buffer_dirty(info->si_sbh);
1da177e4
LT
409 s->s_dirt = 1;
410 }
411 dump_imap("read_super", s);
412 return 0;
413
414out:
415 brelse(bh);
416 kfree(info);
417 s->s_fs_info = NULL;
e33ab086 418 return ret;
1da177e4
LT
419}
420
454e2398
DH
421static int bfs_get_sb(struct file_system_type *fs_type,
422 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 423{
454e2398 424 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
1da177e4
LT
425}
426
427static struct file_system_type bfs_fs_type = {
428 .owner = THIS_MODULE,
429 .name = "bfs",
430 .get_sb = bfs_get_sb,
431 .kill_sb = kill_block_super,
432 .fs_flags = FS_REQUIRES_DEV,
433};
434
435static int __init init_bfs_fs(void)
436{
437 int err = init_inodecache();
438 if (err)
439 goto out1;
440 err = register_filesystem(&bfs_fs_type);
441 if (err)
442 goto out;
443 return 0;
444out:
445 destroy_inodecache();
446out1:
447 return err;
448}
449
450static void __exit exit_bfs_fs(void)
451{
452 unregister_filesystem(&bfs_fs_type);
453 destroy_inodecache();
454}
455
456module_init(init_bfs_fs)
457module_exit(exit_bfs_fs)