]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * super.c | |
3 | * | |
4 | * Copyright (c) 1999 Al Smith | |
5 | * | |
6 | * Portions derived from work (c) 1995,1996 Christian Vogelgsang. | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/efs_fs.h> | |
12 | #include <linux/efs_vh.h> | |
13 | #include <linux/efs_fs_sb.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/buffer_head.h> | |
16 | #include <linux/vfs.h> | |
17 | ||
18 | static int efs_statfs(struct super_block *s, struct kstatfs *buf); | |
19 | static int efs_fill_super(struct super_block *s, void *d, int silent); | |
20 | ||
21 | static struct super_block *efs_get_sb(struct file_system_type *fs_type, | |
22 | int flags, const char *dev_name, void *data) | |
23 | { | |
24 | return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super); | |
25 | } | |
26 | ||
27 | static struct file_system_type efs_fs_type = { | |
28 | .owner = THIS_MODULE, | |
29 | .name = "efs", | |
30 | .get_sb = efs_get_sb, | |
31 | .kill_sb = kill_block_super, | |
32 | .fs_flags = FS_REQUIRES_DEV, | |
33 | }; | |
34 | ||
35 | static struct pt_types sgi_pt_types[] = { | |
36 | {0x00, "SGI vh"}, | |
37 | {0x01, "SGI trkrepl"}, | |
38 | {0x02, "SGI secrepl"}, | |
39 | {0x03, "SGI raw"}, | |
40 | {0x04, "SGI bsd"}, | |
41 | {SGI_SYSV, "SGI sysv"}, | |
42 | {0x06, "SGI vol"}, | |
43 | {SGI_EFS, "SGI efs"}, | |
44 | {0x08, "SGI lv"}, | |
45 | {0x09, "SGI rlv"}, | |
46 | {0x0A, "SGI xfs"}, | |
47 | {0x0B, "SGI xfslog"}, | |
48 | {0x0C, "SGI xlv"}, | |
49 | {0x82, "Linux swap"}, | |
50 | {0x83, "Linux native"}, | |
51 | {0, NULL} | |
52 | }; | |
53 | ||
54 | ||
55 | static kmem_cache_t * efs_inode_cachep; | |
56 | ||
57 | static struct inode *efs_alloc_inode(struct super_block *sb) | |
58 | { | |
59 | struct efs_inode_info *ei; | |
60 | ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, SLAB_KERNEL); | |
61 | if (!ei) | |
62 | return NULL; | |
63 | return &ei->vfs_inode; | |
64 | } | |
65 | ||
66 | static void efs_destroy_inode(struct inode *inode) | |
67 | { | |
68 | kmem_cache_free(efs_inode_cachep, INODE_INFO(inode)); | |
69 | } | |
70 | ||
71 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
72 | { | |
73 | struct efs_inode_info *ei = (struct efs_inode_info *) foo; | |
74 | ||
75 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
76 | SLAB_CTOR_CONSTRUCTOR) | |
77 | inode_init_once(&ei->vfs_inode); | |
78 | } | |
79 | ||
80 | static int init_inodecache(void) | |
81 | { | |
82 | efs_inode_cachep = kmem_cache_create("efs_inode_cache", | |
83 | sizeof(struct efs_inode_info), | |
4b6a9316 | 84 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
1da177e4 LT |
85 | init_once, NULL); |
86 | if (efs_inode_cachep == NULL) | |
87 | return -ENOMEM; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static void destroy_inodecache(void) | |
92 | { | |
93 | if (kmem_cache_destroy(efs_inode_cachep)) | |
94 | printk(KERN_INFO "efs_inode_cache: not all structures were freed\n"); | |
95 | } | |
96 | ||
97 | static void efs_put_super(struct super_block *s) | |
98 | { | |
99 | kfree(s->s_fs_info); | |
100 | s->s_fs_info = NULL; | |
101 | } | |
102 | ||
103 | static int efs_remount(struct super_block *sb, int *flags, char *data) | |
104 | { | |
105 | *flags |= MS_RDONLY; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static struct super_operations efs_superblock_operations = { | |
110 | .alloc_inode = efs_alloc_inode, | |
111 | .destroy_inode = efs_destroy_inode, | |
112 | .read_inode = efs_read_inode, | |
113 | .put_super = efs_put_super, | |
114 | .statfs = efs_statfs, | |
115 | .remount_fs = efs_remount, | |
116 | }; | |
117 | ||
118 | static struct export_operations efs_export_ops = { | |
119 | .get_parent = efs_get_parent, | |
120 | }; | |
121 | ||
122 | static int __init init_efs_fs(void) { | |
123 | int err; | |
124 | printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n"); | |
125 | err = init_inodecache(); | |
126 | if (err) | |
127 | goto out1; | |
128 | err = register_filesystem(&efs_fs_type); | |
129 | if (err) | |
130 | goto out; | |
131 | return 0; | |
132 | out: | |
133 | destroy_inodecache(); | |
134 | out1: | |
135 | return err; | |
136 | } | |
137 | ||
138 | static void __exit exit_efs_fs(void) { | |
139 | unregister_filesystem(&efs_fs_type); | |
140 | destroy_inodecache(); | |
141 | } | |
142 | ||
143 | module_init(init_efs_fs) | |
144 | module_exit(exit_efs_fs) | |
145 | ||
146 | static efs_block_t efs_validate_vh(struct volume_header *vh) { | |
147 | int i; | |
148 | __be32 cs, *ui; | |
149 | int csum; | |
150 | efs_block_t sblock = 0; /* shuts up gcc */ | |
151 | struct pt_types *pt_entry; | |
152 | int pt_type, slice = -1; | |
153 | ||
154 | if (be32_to_cpu(vh->vh_magic) != VHMAGIC) { | |
155 | /* | |
156 | * assume that we're dealing with a partition and allow | |
157 | * read_super() to try and detect a valid superblock | |
158 | * on the next block. | |
159 | */ | |
160 | return 0; | |
161 | } | |
162 | ||
163 | ui = ((__be32 *) (vh + 1)) - 1; | |
164 | for(csum = 0; ui >= ((__be32 *) vh);) { | |
165 | cs = *ui--; | |
166 | csum += be32_to_cpu(cs); | |
167 | } | |
168 | if (csum) { | |
169 | printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n"); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | #ifdef DEBUG | |
174 | printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile); | |
175 | ||
176 | for(i = 0; i < NVDIR; i++) { | |
177 | int j; | |
178 | char name[VDNAMESIZE+1]; | |
179 | ||
180 | for(j = 0; j < VDNAMESIZE; j++) { | |
181 | name[j] = vh->vh_vd[i].vd_name[j]; | |
182 | } | |
183 | name[j] = (char) 0; | |
184 | ||
185 | if (name[0]) { | |
186 | printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n", | |
187 | name, | |
188 | (int) be32_to_cpu(vh->vh_vd[i].vd_lbn), | |
189 | (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes)); | |
190 | } | |
191 | } | |
192 | #endif | |
193 | ||
194 | for(i = 0; i < NPARTAB; i++) { | |
195 | pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type); | |
196 | for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) { | |
197 | if (pt_type == pt_entry->pt_type) break; | |
198 | } | |
199 | #ifdef DEBUG | |
200 | if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) { | |
201 | printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n", | |
202 | i, | |
203 | (int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn), | |
204 | (int) be32_to_cpu(vh->vh_pt[i].pt_nblks), | |
205 | pt_type, | |
206 | (pt_entry->pt_name) ? pt_entry->pt_name : "unknown"); | |
207 | } | |
208 | #endif | |
209 | if (IS_EFS(pt_type)) { | |
210 | sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn); | |
211 | slice = i; | |
212 | } | |
213 | } | |
214 | ||
215 | if (slice == -1) { | |
216 | printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n"); | |
217 | #ifdef DEBUG | |
218 | } else { | |
219 | printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n", | |
220 | slice, | |
221 | (pt_entry->pt_name) ? pt_entry->pt_name : "unknown", | |
222 | sblock); | |
223 | #endif | |
224 | } | |
014c2544 | 225 | return sblock; |
1da177e4 LT |
226 | } |
227 | ||
228 | static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) { | |
229 | ||
014c2544 JJ |
230 | if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic))) |
231 | return -1; | |
1da177e4 LT |
232 | |
233 | sb->fs_magic = be32_to_cpu(super->fs_magic); | |
234 | sb->total_blocks = be32_to_cpu(super->fs_size); | |
235 | sb->first_block = be32_to_cpu(super->fs_firstcg); | |
236 | sb->group_size = be32_to_cpu(super->fs_cgfsize); | |
237 | sb->data_free = be32_to_cpu(super->fs_tfree); | |
238 | sb->inode_free = be32_to_cpu(super->fs_tinode); | |
239 | sb->inode_blocks = be16_to_cpu(super->fs_cgisize); | |
240 | sb->total_groups = be16_to_cpu(super->fs_ncg); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static int efs_fill_super(struct super_block *s, void *d, int silent) | |
246 | { | |
247 | struct efs_sb_info *sb; | |
248 | struct buffer_head *bh; | |
249 | struct inode *root; | |
250 | ||
251 | sb = kmalloc(sizeof(struct efs_sb_info), GFP_KERNEL); | |
252 | if (!sb) | |
253 | return -ENOMEM; | |
254 | s->s_fs_info = sb; | |
255 | memset(sb, 0, sizeof(struct efs_sb_info)); | |
256 | ||
257 | s->s_magic = EFS_SUPER_MAGIC; | |
258 | if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) { | |
259 | printk(KERN_ERR "EFS: device does not support %d byte blocks\n", | |
260 | EFS_BLOCKSIZE); | |
261 | goto out_no_fs_ul; | |
262 | } | |
263 | ||
264 | /* read the vh (volume header) block */ | |
265 | bh = sb_bread(s, 0); | |
266 | ||
267 | if (!bh) { | |
268 | printk(KERN_ERR "EFS: cannot read volume header\n"); | |
269 | goto out_no_fs_ul; | |
270 | } | |
271 | ||
272 | /* | |
273 | * if this returns zero then we didn't find any partition table. | |
274 | * this isn't (yet) an error - just assume for the moment that | |
275 | * the device is valid and go on to search for a superblock. | |
276 | */ | |
277 | sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data); | |
278 | brelse(bh); | |
279 | ||
280 | if (sb->fs_start == -1) { | |
281 | goto out_no_fs_ul; | |
282 | } | |
283 | ||
284 | bh = sb_bread(s, sb->fs_start + EFS_SUPER); | |
285 | if (!bh) { | |
286 | printk(KERN_ERR "EFS: cannot read superblock\n"); | |
287 | goto out_no_fs_ul; | |
288 | } | |
289 | ||
290 | if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) { | |
291 | #ifdef DEBUG | |
292 | printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER); | |
293 | #endif | |
294 | brelse(bh); | |
295 | goto out_no_fs_ul; | |
296 | } | |
297 | brelse(bh); | |
298 | ||
299 | if (!(s->s_flags & MS_RDONLY)) { | |
300 | #ifdef DEBUG | |
301 | printk(KERN_INFO "EFS: forcing read-only mode\n"); | |
302 | #endif | |
303 | s->s_flags |= MS_RDONLY; | |
304 | } | |
305 | s->s_op = &efs_superblock_operations; | |
306 | s->s_export_op = &efs_export_ops; | |
307 | root = iget(s, EFS_ROOTINODE); | |
308 | s->s_root = d_alloc_root(root); | |
309 | ||
310 | if (!(s->s_root)) { | |
311 | printk(KERN_ERR "EFS: get root inode failed\n"); | |
312 | iput(root); | |
313 | goto out_no_fs; | |
314 | } | |
315 | ||
316 | return 0; | |
317 | ||
318 | out_no_fs_ul: | |
319 | out_no_fs: | |
320 | s->s_fs_info = NULL; | |
321 | kfree(sb); | |
322 | return -EINVAL; | |
323 | } | |
324 | ||
325 | static int efs_statfs(struct super_block *s, struct kstatfs *buf) { | |
326 | struct efs_sb_info *sb = SUPER_INFO(s); | |
327 | ||
328 | buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */ | |
329 | buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */ | |
330 | buf->f_blocks = sb->total_groups * /* total data blocks */ | |
331 | (sb->group_size - sb->inode_blocks); | |
332 | buf->f_bfree = sb->data_free; /* free data blocks */ | |
333 | buf->f_bavail = sb->data_free; /* free blocks for non-root */ | |
334 | buf->f_files = sb->total_groups * /* total inodes */ | |
335 | sb->inode_blocks * | |
336 | (EFS_BLOCKSIZE / sizeof(struct efs_dinode)); | |
337 | buf->f_ffree = sb->inode_free; /* free inodes */ | |
338 | buf->f_fsid.val[0] = (sb->fs_magic >> 16) & 0xffff; /* fs ID */ | |
339 | buf->f_fsid.val[1] = sb->fs_magic & 0xffff; /* fs ID */ | |
340 | buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */ | |
341 | ||
342 | return 0; | |
343 | } | |
344 |