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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/exportfs.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/vfs.h> | |
15 | ||
16 | #include "efs.h" | |
17 | #include <linux/efs_vh.h> | |
18 | #include <linux/efs_fs_sb.h> | |
19 | ||
20 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf); | |
21 | static int efs_fill_super(struct super_block *s, void *d, int silent); | |
22 | ||
23 | static struct dentry *efs_mount(struct file_system_type *fs_type, | |
24 | int flags, const char *dev_name, void *data) | |
25 | { | |
26 | return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super); | |
27 | } | |
28 | ||
29 | static struct file_system_type efs_fs_type = { | |
30 | .owner = THIS_MODULE, | |
31 | .name = "efs", | |
32 | .mount = efs_mount, | |
33 | .kill_sb = kill_block_super, | |
34 | .fs_flags = FS_REQUIRES_DEV, | |
35 | }; | |
36 | ||
37 | static struct pt_types sgi_pt_types[] = { | |
38 | {0x00, "SGI vh"}, | |
39 | {0x01, "SGI trkrepl"}, | |
40 | {0x02, "SGI secrepl"}, | |
41 | {0x03, "SGI raw"}, | |
42 | {0x04, "SGI bsd"}, | |
43 | {SGI_SYSV, "SGI sysv"}, | |
44 | {0x06, "SGI vol"}, | |
45 | {SGI_EFS, "SGI efs"}, | |
46 | {0x08, "SGI lv"}, | |
47 | {0x09, "SGI rlv"}, | |
48 | {0x0A, "SGI xfs"}, | |
49 | {0x0B, "SGI xfslog"}, | |
50 | {0x0C, "SGI xlv"}, | |
51 | {0x82, "Linux swap"}, | |
52 | {0x83, "Linux native"}, | |
53 | {0, NULL} | |
54 | }; | |
55 | ||
56 | ||
57 | static struct kmem_cache * efs_inode_cachep; | |
58 | ||
59 | static struct inode *efs_alloc_inode(struct super_block *sb) | |
60 | { | |
61 | struct efs_inode_info *ei; | |
62 | ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL); | |
63 | if (!ei) | |
64 | return NULL; | |
65 | return &ei->vfs_inode; | |
66 | } | |
67 | ||
68 | static void efs_i_callback(struct rcu_head *head) | |
69 | { | |
70 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
71 | kmem_cache_free(efs_inode_cachep, INODE_INFO(inode)); | |
72 | } | |
73 | ||
74 | static void efs_destroy_inode(struct inode *inode) | |
75 | { | |
76 | call_rcu(&inode->i_rcu, efs_i_callback); | |
77 | } | |
78 | ||
79 | static void init_once(void *foo) | |
80 | { | |
81 | struct efs_inode_info *ei = (struct efs_inode_info *) foo; | |
82 | ||
83 | inode_init_once(&ei->vfs_inode); | |
84 | } | |
85 | ||
86 | static int init_inodecache(void) | |
87 | { | |
88 | efs_inode_cachep = kmem_cache_create("efs_inode_cache", | |
89 | sizeof(struct efs_inode_info), | |
90 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, | |
91 | init_once); | |
92 | if (efs_inode_cachep == NULL) | |
93 | return -ENOMEM; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static void destroy_inodecache(void) | |
98 | { | |
99 | /* | |
100 | * Make sure all delayed rcu free inodes are flushed before we | |
101 | * destroy cache. | |
102 | */ | |
103 | rcu_barrier(); | |
104 | kmem_cache_destroy(efs_inode_cachep); | |
105 | } | |
106 | ||
107 | static void efs_put_super(struct super_block *s) | |
108 | { | |
109 | kfree(s->s_fs_info); | |
110 | s->s_fs_info = NULL; | |
111 | } | |
112 | ||
113 | static int efs_remount(struct super_block *sb, int *flags, char *data) | |
114 | { | |
115 | *flags |= MS_RDONLY; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static const struct super_operations efs_superblock_operations = { | |
120 | .alloc_inode = efs_alloc_inode, | |
121 | .destroy_inode = efs_destroy_inode, | |
122 | .put_super = efs_put_super, | |
123 | .statfs = efs_statfs, | |
124 | .remount_fs = efs_remount, | |
125 | }; | |
126 | ||
127 | static const struct export_operations efs_export_ops = { | |
128 | .fh_to_dentry = efs_fh_to_dentry, | |
129 | .fh_to_parent = efs_fh_to_parent, | |
130 | .get_parent = efs_get_parent, | |
131 | }; | |
132 | ||
133 | static int __init init_efs_fs(void) { | |
134 | int err; | |
135 | printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n"); | |
136 | err = init_inodecache(); | |
137 | if (err) | |
138 | goto out1; | |
139 | err = register_filesystem(&efs_fs_type); | |
140 | if (err) | |
141 | goto out; | |
142 | return 0; | |
143 | out: | |
144 | destroy_inodecache(); | |
145 | out1: | |
146 | return err; | |
147 | } | |
148 | ||
149 | static void __exit exit_efs_fs(void) { | |
150 | unregister_filesystem(&efs_fs_type); | |
151 | destroy_inodecache(); | |
152 | } | |
153 | ||
154 | module_init(init_efs_fs) | |
155 | module_exit(exit_efs_fs) | |
156 | ||
157 | static efs_block_t efs_validate_vh(struct volume_header *vh) { | |
158 | int i; | |
159 | __be32 cs, *ui; | |
160 | int csum; | |
161 | efs_block_t sblock = 0; /* shuts up gcc */ | |
162 | struct pt_types *pt_entry; | |
163 | int pt_type, slice = -1; | |
164 | ||
165 | if (be32_to_cpu(vh->vh_magic) != VHMAGIC) { | |
166 | /* | |
167 | * assume that we're dealing with a partition and allow | |
168 | * read_super() to try and detect a valid superblock | |
169 | * on the next block. | |
170 | */ | |
171 | return 0; | |
172 | } | |
173 | ||
174 | ui = ((__be32 *) (vh + 1)) - 1; | |
175 | for(csum = 0; ui >= ((__be32 *) vh);) { | |
176 | cs = *ui--; | |
177 | csum += be32_to_cpu(cs); | |
178 | } | |
179 | if (csum) { | |
180 | printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n"); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | #ifdef DEBUG | |
185 | printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile); | |
186 | ||
187 | for(i = 0; i < NVDIR; i++) { | |
188 | int j; | |
189 | char name[VDNAMESIZE+1]; | |
190 | ||
191 | for(j = 0; j < VDNAMESIZE; j++) { | |
192 | name[j] = vh->vh_vd[i].vd_name[j]; | |
193 | } | |
194 | name[j] = (char) 0; | |
195 | ||
196 | if (name[0]) { | |
197 | printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n", | |
198 | name, | |
199 | (int) be32_to_cpu(vh->vh_vd[i].vd_lbn), | |
200 | (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes)); | |
201 | } | |
202 | } | |
203 | #endif | |
204 | ||
205 | for(i = 0; i < NPARTAB; i++) { | |
206 | pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type); | |
207 | for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) { | |
208 | if (pt_type == pt_entry->pt_type) break; | |
209 | } | |
210 | #ifdef DEBUG | |
211 | if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) { | |
212 | printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n", | |
213 | i, | |
214 | (int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn), | |
215 | (int) be32_to_cpu(vh->vh_pt[i].pt_nblks), | |
216 | pt_type, | |
217 | (pt_entry->pt_name) ? pt_entry->pt_name : "unknown"); | |
218 | } | |
219 | #endif | |
220 | if (IS_EFS(pt_type)) { | |
221 | sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn); | |
222 | slice = i; | |
223 | } | |
224 | } | |
225 | ||
226 | if (slice == -1) { | |
227 | printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n"); | |
228 | #ifdef DEBUG | |
229 | } else { | |
230 | printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n", | |
231 | slice, | |
232 | (pt_entry->pt_name) ? pt_entry->pt_name : "unknown", | |
233 | sblock); | |
234 | #endif | |
235 | } | |
236 | return sblock; | |
237 | } | |
238 | ||
239 | static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) { | |
240 | ||
241 | if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic))) | |
242 | return -1; | |
243 | ||
244 | sb->fs_magic = be32_to_cpu(super->fs_magic); | |
245 | sb->total_blocks = be32_to_cpu(super->fs_size); | |
246 | sb->first_block = be32_to_cpu(super->fs_firstcg); | |
247 | sb->group_size = be32_to_cpu(super->fs_cgfsize); | |
248 | sb->data_free = be32_to_cpu(super->fs_tfree); | |
249 | sb->inode_free = be32_to_cpu(super->fs_tinode); | |
250 | sb->inode_blocks = be16_to_cpu(super->fs_cgisize); | |
251 | sb->total_groups = be16_to_cpu(super->fs_ncg); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static int efs_fill_super(struct super_block *s, void *d, int silent) | |
257 | { | |
258 | struct efs_sb_info *sb; | |
259 | struct buffer_head *bh; | |
260 | struct inode *root; | |
261 | int ret = -EINVAL; | |
262 | ||
263 | sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL); | |
264 | if (!sb) | |
265 | return -ENOMEM; | |
266 | s->s_fs_info = sb; | |
267 | ||
268 | s->s_magic = EFS_SUPER_MAGIC; | |
269 | if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) { | |
270 | printk(KERN_ERR "EFS: device does not support %d byte blocks\n", | |
271 | EFS_BLOCKSIZE); | |
272 | goto out_no_fs_ul; | |
273 | } | |
274 | ||
275 | /* read the vh (volume header) block */ | |
276 | bh = sb_bread(s, 0); | |
277 | ||
278 | if (!bh) { | |
279 | printk(KERN_ERR "EFS: cannot read volume header\n"); | |
280 | goto out_no_fs_ul; | |
281 | } | |
282 | ||
283 | /* | |
284 | * if this returns zero then we didn't find any partition table. | |
285 | * this isn't (yet) an error - just assume for the moment that | |
286 | * the device is valid and go on to search for a superblock. | |
287 | */ | |
288 | sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data); | |
289 | brelse(bh); | |
290 | ||
291 | if (sb->fs_start == -1) { | |
292 | goto out_no_fs_ul; | |
293 | } | |
294 | ||
295 | bh = sb_bread(s, sb->fs_start + EFS_SUPER); | |
296 | if (!bh) { | |
297 | printk(KERN_ERR "EFS: cannot read superblock\n"); | |
298 | goto out_no_fs_ul; | |
299 | } | |
300 | ||
301 | if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) { | |
302 | #ifdef DEBUG | |
303 | printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER); | |
304 | #endif | |
305 | brelse(bh); | |
306 | goto out_no_fs_ul; | |
307 | } | |
308 | brelse(bh); | |
309 | ||
310 | if (!(s->s_flags & MS_RDONLY)) { | |
311 | #ifdef DEBUG | |
312 | printk(KERN_INFO "EFS: forcing read-only mode\n"); | |
313 | #endif | |
314 | s->s_flags |= MS_RDONLY; | |
315 | } | |
316 | s->s_op = &efs_superblock_operations; | |
317 | s->s_export_op = &efs_export_ops; | |
318 | root = efs_iget(s, EFS_ROOTINODE); | |
319 | if (IS_ERR(root)) { | |
320 | printk(KERN_ERR "EFS: get root inode failed\n"); | |
321 | ret = PTR_ERR(root); | |
322 | goto out_no_fs; | |
323 | } | |
324 | ||
325 | s->s_root = d_make_root(root); | |
326 | if (!(s->s_root)) { | |
327 | printk(KERN_ERR "EFS: get root dentry failed\n"); | |
328 | ret = -ENOMEM; | |
329 | goto out_no_fs; | |
330 | } | |
331 | ||
332 | return 0; | |
333 | ||
334 | out_no_fs_ul: | |
335 | out_no_fs: | |
336 | s->s_fs_info = NULL; | |
337 | kfree(sb); | |
338 | return ret; | |
339 | } | |
340 | ||
341 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) { | |
342 | struct super_block *sb = dentry->d_sb; | |
343 | struct efs_sb_info *sbi = SUPER_INFO(sb); | |
344 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
345 | ||
346 | buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */ | |
347 | buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */ | |
348 | buf->f_blocks = sbi->total_groups * /* total data blocks */ | |
349 | (sbi->group_size - sbi->inode_blocks); | |
350 | buf->f_bfree = sbi->data_free; /* free data blocks */ | |
351 | buf->f_bavail = sbi->data_free; /* free blocks for non-root */ | |
352 | buf->f_files = sbi->total_groups * /* total inodes */ | |
353 | sbi->inode_blocks * | |
354 | (EFS_BLOCKSIZE / sizeof(struct efs_dinode)); | |
355 | buf->f_ffree = sbi->inode_free; /* free inodes */ | |
356 | buf->f_fsid.val[0] = (u32)id; | |
357 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
358 | buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */ | |
359 | ||
360 | return 0; | |
361 | } | |
362 |