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 | ||
726c3342 | 18 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 LT |
19 | static int efs_fill_super(struct super_block *s, void *d, int silent); |
20 | ||
454e2398 DH |
21 | static int efs_get_sb(struct file_system_type *fs_type, |
22 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 23 | { |
454e2398 | 24 | return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super, mnt); |
1da177e4 LT |
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 | ||
e18b890b | 55 | static struct kmem_cache * efs_inode_cachep; |
1da177e4 LT |
56 | |
57 | static struct inode *efs_alloc_inode(struct super_block *sb) | |
58 | { | |
59 | struct efs_inode_info *ei; | |
e94b1766 | 60 | ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
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 | ||
e18b890b | 71 | static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
1da177e4 LT |
72 | { |
73 | struct efs_inode_info *ei = (struct efs_inode_info *) foo; | |
74 | ||
50953fe9 | 75 | if (flags & SLAB_CTOR_CONSTRUCTOR) |
1da177e4 LT |
76 | inode_init_once(&ei->vfs_inode); |
77 | } | |
78 | ||
79 | static int init_inodecache(void) | |
80 | { | |
81 | efs_inode_cachep = kmem_cache_create("efs_inode_cache", | |
82 | sizeof(struct efs_inode_info), | |
4b6a9316 | 83 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
1da177e4 LT |
84 | init_once, NULL); |
85 | if (efs_inode_cachep == NULL) | |
86 | return -ENOMEM; | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static void destroy_inodecache(void) | |
91 | { | |
1a1d92c1 | 92 | kmem_cache_destroy(efs_inode_cachep); |
1da177e4 LT |
93 | } |
94 | ||
95 | static void efs_put_super(struct super_block *s) | |
96 | { | |
97 | kfree(s->s_fs_info); | |
98 | s->s_fs_info = NULL; | |
99 | } | |
100 | ||
101 | static int efs_remount(struct super_block *sb, int *flags, char *data) | |
102 | { | |
103 | *flags |= MS_RDONLY; | |
104 | return 0; | |
105 | } | |
106 | ||
ee9b6d61 | 107 | static const struct super_operations efs_superblock_operations = { |
1da177e4 LT |
108 | .alloc_inode = efs_alloc_inode, |
109 | .destroy_inode = efs_destroy_inode, | |
110 | .read_inode = efs_read_inode, | |
111 | .put_super = efs_put_super, | |
112 | .statfs = efs_statfs, | |
113 | .remount_fs = efs_remount, | |
114 | }; | |
115 | ||
116 | static struct export_operations efs_export_ops = { | |
117 | .get_parent = efs_get_parent, | |
118 | }; | |
119 | ||
120 | static int __init init_efs_fs(void) { | |
121 | int err; | |
122 | printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n"); | |
123 | err = init_inodecache(); | |
124 | if (err) | |
125 | goto out1; | |
126 | err = register_filesystem(&efs_fs_type); | |
127 | if (err) | |
128 | goto out; | |
129 | return 0; | |
130 | out: | |
131 | destroy_inodecache(); | |
132 | out1: | |
133 | return err; | |
134 | } | |
135 | ||
136 | static void __exit exit_efs_fs(void) { | |
137 | unregister_filesystem(&efs_fs_type); | |
138 | destroy_inodecache(); | |
139 | } | |
140 | ||
141 | module_init(init_efs_fs) | |
142 | module_exit(exit_efs_fs) | |
143 | ||
144 | static efs_block_t efs_validate_vh(struct volume_header *vh) { | |
145 | int i; | |
146 | __be32 cs, *ui; | |
147 | int csum; | |
148 | efs_block_t sblock = 0; /* shuts up gcc */ | |
149 | struct pt_types *pt_entry; | |
150 | int pt_type, slice = -1; | |
151 | ||
152 | if (be32_to_cpu(vh->vh_magic) != VHMAGIC) { | |
153 | /* | |
154 | * assume that we're dealing with a partition and allow | |
155 | * read_super() to try and detect a valid superblock | |
156 | * on the next block. | |
157 | */ | |
158 | return 0; | |
159 | } | |
160 | ||
161 | ui = ((__be32 *) (vh + 1)) - 1; | |
162 | for(csum = 0; ui >= ((__be32 *) vh);) { | |
163 | cs = *ui--; | |
164 | csum += be32_to_cpu(cs); | |
165 | } | |
166 | if (csum) { | |
167 | printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n"); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | #ifdef DEBUG | |
172 | printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile); | |
173 | ||
174 | for(i = 0; i < NVDIR; i++) { | |
175 | int j; | |
176 | char name[VDNAMESIZE+1]; | |
177 | ||
178 | for(j = 0; j < VDNAMESIZE; j++) { | |
179 | name[j] = vh->vh_vd[i].vd_name[j]; | |
180 | } | |
181 | name[j] = (char) 0; | |
182 | ||
183 | if (name[0]) { | |
184 | printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n", | |
185 | name, | |
186 | (int) be32_to_cpu(vh->vh_vd[i].vd_lbn), | |
187 | (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes)); | |
188 | } | |
189 | } | |
190 | #endif | |
191 | ||
192 | for(i = 0; i < NPARTAB; i++) { | |
193 | pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type); | |
194 | for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) { | |
195 | if (pt_type == pt_entry->pt_type) break; | |
196 | } | |
197 | #ifdef DEBUG | |
198 | if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) { | |
199 | printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n", | |
200 | i, | |
201 | (int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn), | |
202 | (int) be32_to_cpu(vh->vh_pt[i].pt_nblks), | |
203 | pt_type, | |
204 | (pt_entry->pt_name) ? pt_entry->pt_name : "unknown"); | |
205 | } | |
206 | #endif | |
207 | if (IS_EFS(pt_type)) { | |
208 | sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn); | |
209 | slice = i; | |
210 | } | |
211 | } | |
212 | ||
213 | if (slice == -1) { | |
214 | printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n"); | |
215 | #ifdef DEBUG | |
216 | } else { | |
217 | printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n", | |
218 | slice, | |
219 | (pt_entry->pt_name) ? pt_entry->pt_name : "unknown", | |
220 | sblock); | |
221 | #endif | |
222 | } | |
014c2544 | 223 | return sblock; |
1da177e4 LT |
224 | } |
225 | ||
226 | static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) { | |
227 | ||
014c2544 JJ |
228 | if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic))) |
229 | return -1; | |
1da177e4 LT |
230 | |
231 | sb->fs_magic = be32_to_cpu(super->fs_magic); | |
232 | sb->total_blocks = be32_to_cpu(super->fs_size); | |
233 | sb->first_block = be32_to_cpu(super->fs_firstcg); | |
234 | sb->group_size = be32_to_cpu(super->fs_cgfsize); | |
235 | sb->data_free = be32_to_cpu(super->fs_tfree); | |
236 | sb->inode_free = be32_to_cpu(super->fs_tinode); | |
237 | sb->inode_blocks = be16_to_cpu(super->fs_cgisize); | |
238 | sb->total_groups = be16_to_cpu(super->fs_ncg); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static int efs_fill_super(struct super_block *s, void *d, int silent) | |
244 | { | |
245 | struct efs_sb_info *sb; | |
246 | struct buffer_head *bh; | |
247 | struct inode *root; | |
248 | ||
f8314dc6 | 249 | sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL); |
1da177e4 LT |
250 | if (!sb) |
251 | return -ENOMEM; | |
252 | s->s_fs_info = sb; | |
1da177e4 LT |
253 | |
254 | s->s_magic = EFS_SUPER_MAGIC; | |
255 | if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) { | |
256 | printk(KERN_ERR "EFS: device does not support %d byte blocks\n", | |
257 | EFS_BLOCKSIZE); | |
258 | goto out_no_fs_ul; | |
259 | } | |
260 | ||
261 | /* read the vh (volume header) block */ | |
262 | bh = sb_bread(s, 0); | |
263 | ||
264 | if (!bh) { | |
265 | printk(KERN_ERR "EFS: cannot read volume header\n"); | |
266 | goto out_no_fs_ul; | |
267 | } | |
268 | ||
269 | /* | |
270 | * if this returns zero then we didn't find any partition table. | |
271 | * this isn't (yet) an error - just assume for the moment that | |
272 | * the device is valid and go on to search for a superblock. | |
273 | */ | |
274 | sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data); | |
275 | brelse(bh); | |
276 | ||
277 | if (sb->fs_start == -1) { | |
278 | goto out_no_fs_ul; | |
279 | } | |
280 | ||
281 | bh = sb_bread(s, sb->fs_start + EFS_SUPER); | |
282 | if (!bh) { | |
283 | printk(KERN_ERR "EFS: cannot read superblock\n"); | |
284 | goto out_no_fs_ul; | |
285 | } | |
286 | ||
287 | if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) { | |
288 | #ifdef DEBUG | |
289 | printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER); | |
290 | #endif | |
291 | brelse(bh); | |
292 | goto out_no_fs_ul; | |
293 | } | |
294 | brelse(bh); | |
295 | ||
296 | if (!(s->s_flags & MS_RDONLY)) { | |
297 | #ifdef DEBUG | |
298 | printk(KERN_INFO "EFS: forcing read-only mode\n"); | |
299 | #endif | |
300 | s->s_flags |= MS_RDONLY; | |
301 | } | |
302 | s->s_op = &efs_superblock_operations; | |
303 | s->s_export_op = &efs_export_ops; | |
304 | root = iget(s, EFS_ROOTINODE); | |
305 | s->s_root = d_alloc_root(root); | |
306 | ||
307 | if (!(s->s_root)) { | |
308 | printk(KERN_ERR "EFS: get root inode failed\n"); | |
309 | iput(root); | |
310 | goto out_no_fs; | |
311 | } | |
312 | ||
313 | return 0; | |
314 | ||
315 | out_no_fs_ul: | |
316 | out_no_fs: | |
317 | s->s_fs_info = NULL; | |
318 | kfree(sb); | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
726c3342 DH |
322 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) { |
323 | struct efs_sb_info *sb = SUPER_INFO(dentry->d_sb); | |
1da177e4 LT |
324 | |
325 | buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */ | |
326 | buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */ | |
327 | buf->f_blocks = sb->total_groups * /* total data blocks */ | |
328 | (sb->group_size - sb->inode_blocks); | |
329 | buf->f_bfree = sb->data_free; /* free data blocks */ | |
330 | buf->f_bavail = sb->data_free; /* free blocks for non-root */ | |
331 | buf->f_files = sb->total_groups * /* total inodes */ | |
332 | sb->inode_blocks * | |
333 | (EFS_BLOCKSIZE / sizeof(struct efs_dinode)); | |
334 | buf->f_ffree = sb->inode_free; /* free inodes */ | |
335 | buf->f_fsid.val[0] = (sb->fs_magic >> 16) & 0xffff; /* fs ID */ | |
336 | buf->f_fsid.val[1] = sb->fs_magic & 0xffff; /* fs ID */ | |
337 | buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */ | |
338 | ||
339 | return 0; | |
340 | } | |
341 |