Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * super.c | |
4 | * | |
5 | * Copyright (c) 1999 Al Smith | |
6 | * | |
7 | * Portions derived from work (c) 1995,1996 Christian Vogelgsang. | |
8 | */ | |
9 | ||
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
a5694255 | 12 | #include <linux/exportfs.h> |
1da177e4 LT |
13 | #include <linux/slab.h> |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/vfs.h> | |
621c1f42 | 16 | #include <linux/blkdev.h> |
1da177e4 | 17 | |
45254b4f CH |
18 | #include "efs.h" |
19 | #include <linux/efs_vh.h> | |
20 | #include <linux/efs_fs_sb.h> | |
21 | ||
726c3342 | 22 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 LT |
23 | static int efs_fill_super(struct super_block *s, void *d, int silent); |
24 | ||
152a0836 AV |
25 | static struct dentry *efs_mount(struct file_system_type *fs_type, |
26 | int flags, const char *dev_name, void *data) | |
1da177e4 | 27 | { |
152a0836 | 28 | return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super); |
1da177e4 LT |
29 | } |
30 | ||
5a9ed6f5 AV |
31 | static void efs_kill_sb(struct super_block *s) |
32 | { | |
33 | struct efs_sb_info *sbi = SUPER_INFO(s); | |
34 | kill_block_super(s); | |
35 | kfree(sbi); | |
36 | } | |
37 | ||
1da177e4 LT |
38 | static struct file_system_type efs_fs_type = { |
39 | .owner = THIS_MODULE, | |
40 | .name = "efs", | |
152a0836 | 41 | .mount = efs_mount, |
5a9ed6f5 | 42 | .kill_sb = efs_kill_sb, |
1da177e4 LT |
43 | .fs_flags = FS_REQUIRES_DEV, |
44 | }; | |
7f78e035 | 45 | MODULE_ALIAS_FS("efs"); |
1da177e4 LT |
46 | |
47 | static struct pt_types sgi_pt_types[] = { | |
48 | {0x00, "SGI vh"}, | |
49 | {0x01, "SGI trkrepl"}, | |
50 | {0x02, "SGI secrepl"}, | |
51 | {0x03, "SGI raw"}, | |
52 | {0x04, "SGI bsd"}, | |
53 | {SGI_SYSV, "SGI sysv"}, | |
54 | {0x06, "SGI vol"}, | |
55 | {SGI_EFS, "SGI efs"}, | |
56 | {0x08, "SGI lv"}, | |
57 | {0x09, "SGI rlv"}, | |
58 | {0x0A, "SGI xfs"}, | |
59 | {0x0B, "SGI xfslog"}, | |
60 | {0x0C, "SGI xlv"}, | |
61 | {0x82, "Linux swap"}, | |
62 | {0x83, "Linux native"}, | |
63 | {0, NULL} | |
64 | }; | |
65 | ||
66 | ||
e18b890b | 67 | static struct kmem_cache * efs_inode_cachep; |
1da177e4 LT |
68 | |
69 | static struct inode *efs_alloc_inode(struct super_block *sb) | |
70 | { | |
71 | struct efs_inode_info *ei; | |
35a4c902 | 72 | ei = kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
73 | if (!ei) |
74 | return NULL; | |
75 | return &ei->vfs_inode; | |
76 | } | |
77 | ||
f415c511 | 78 | static void efs_free_inode(struct inode *inode) |
1da177e4 LT |
79 | { |
80 | kmem_cache_free(efs_inode_cachep, INODE_INFO(inode)); | |
81 | } | |
82 | ||
51cc5068 | 83 | static void init_once(void *foo) |
1da177e4 LT |
84 | { |
85 | struct efs_inode_info *ei = (struct efs_inode_info *) foo; | |
86 | ||
a35afb83 | 87 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 88 | } |
20c2df83 | 89 | |
7a42d4b6 | 90 | static int __init init_inodecache(void) |
1da177e4 LT |
91 | { |
92 | efs_inode_cachep = kmem_cache_create("efs_inode_cache", | |
5d097056 VD |
93 | sizeof(struct efs_inode_info), 0, |
94 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| | |
95 | SLAB_ACCOUNT, init_once); | |
1da177e4 LT |
96 | if (efs_inode_cachep == NULL) |
97 | return -ENOMEM; | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static void destroy_inodecache(void) | |
102 | { | |
8c0a8537 KS |
103 | /* |
104 | * Make sure all delayed rcu free inodes are flushed before we | |
105 | * destroy cache. | |
106 | */ | |
107 | rcu_barrier(); | |
1a1d92c1 | 108 | kmem_cache_destroy(efs_inode_cachep); |
1da177e4 LT |
109 | } |
110 | ||
1da177e4 LT |
111 | static int efs_remount(struct super_block *sb, int *flags, char *data) |
112 | { | |
02b9984d | 113 | sync_filesystem(sb); |
1751e8a6 | 114 | *flags |= SB_RDONLY; |
1da177e4 LT |
115 | return 0; |
116 | } | |
117 | ||
ee9b6d61 | 118 | static const struct super_operations efs_superblock_operations = { |
1da177e4 | 119 | .alloc_inode = efs_alloc_inode, |
f415c511 | 120 | .free_inode = efs_free_inode, |
1da177e4 LT |
121 | .statfs = efs_statfs, |
122 | .remount_fs = efs_remount, | |
123 | }; | |
124 | ||
39655164 | 125 | static const struct export_operations efs_export_ops = { |
05da0804 CH |
126 | .fh_to_dentry = efs_fh_to_dentry, |
127 | .fh_to_parent = efs_fh_to_parent, | |
1da177e4 LT |
128 | .get_parent = efs_get_parent, |
129 | }; | |
130 | ||
131 | static int __init init_efs_fs(void) { | |
132 | int err; | |
f403d1db | 133 | pr_info(EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n"); |
1da177e4 LT |
134 | err = init_inodecache(); |
135 | if (err) | |
136 | goto out1; | |
137 | err = register_filesystem(&efs_fs_type); | |
138 | if (err) | |
139 | goto out; | |
140 | return 0; | |
141 | out: | |
142 | destroy_inodecache(); | |
143 | out1: | |
144 | return err; | |
145 | } | |
146 | ||
147 | static void __exit exit_efs_fs(void) { | |
148 | unregister_filesystem(&efs_fs_type); | |
149 | destroy_inodecache(); | |
150 | } | |
151 | ||
152 | module_init(init_efs_fs) | |
153 | module_exit(exit_efs_fs) | |
154 | ||
155 | static efs_block_t efs_validate_vh(struct volume_header *vh) { | |
156 | int i; | |
157 | __be32 cs, *ui; | |
158 | int csum; | |
159 | efs_block_t sblock = 0; /* shuts up gcc */ | |
160 | struct pt_types *pt_entry; | |
161 | int pt_type, slice = -1; | |
162 | ||
163 | if (be32_to_cpu(vh->vh_magic) != VHMAGIC) { | |
164 | /* | |
165 | * assume that we're dealing with a partition and allow | |
166 | * read_super() to try and detect a valid superblock | |
167 | * on the next block. | |
168 | */ | |
169 | return 0; | |
170 | } | |
171 | ||
172 | ui = ((__be32 *) (vh + 1)) - 1; | |
173 | for(csum = 0; ui >= ((__be32 *) vh);) { | |
174 | cs = *ui--; | |
175 | csum += be32_to_cpu(cs); | |
176 | } | |
177 | if (csum) { | |
f403d1db | 178 | pr_warn("SGI disklabel: checksum bad, label corrupted\n"); |
1da177e4 LT |
179 | return 0; |
180 | } | |
181 | ||
182 | #ifdef DEBUG | |
d1826f2a | 183 | pr_debug("bf: \"%16s\"\n", vh->vh_bootfile); |
1da177e4 LT |
184 | |
185 | for(i = 0; i < NVDIR; i++) { | |
186 | int j; | |
187 | char name[VDNAMESIZE+1]; | |
188 | ||
189 | for(j = 0; j < VDNAMESIZE; j++) { | |
190 | name[j] = vh->vh_vd[i].vd_name[j]; | |
191 | } | |
192 | name[j] = (char) 0; | |
193 | ||
194 | if (name[0]) { | |
d1826f2a FF |
195 | pr_debug("vh: %8s block: 0x%08x size: 0x%08x\n", |
196 | name, (int) be32_to_cpu(vh->vh_vd[i].vd_lbn), | |
1da177e4 LT |
197 | (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes)); |
198 | } | |
199 | } | |
200 | #endif | |
201 | ||
202 | for(i = 0; i < NPARTAB; i++) { | |
203 | pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type); | |
204 | for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) { | |
205 | if (pt_type == pt_entry->pt_type) break; | |
206 | } | |
207 | #ifdef DEBUG | |
208 | if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) { | |
d1826f2a FF |
209 | pr_debug("pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n", |
210 | i, (int)be32_to_cpu(vh->vh_pt[i].pt_firstlbn), | |
211 | (int)be32_to_cpu(vh->vh_pt[i].pt_nblks), | |
212 | pt_type, (pt_entry->pt_name) ? | |
213 | pt_entry->pt_name : "unknown"); | |
1da177e4 LT |
214 | } |
215 | #endif | |
216 | if (IS_EFS(pt_type)) { | |
217 | sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn); | |
218 | slice = i; | |
219 | } | |
220 | } | |
221 | ||
222 | if (slice == -1) { | |
f403d1db | 223 | pr_notice("partition table contained no EFS partitions\n"); |
1da177e4 LT |
224 | #ifdef DEBUG |
225 | } else { | |
f403d1db | 226 | pr_info("using slice %d (type %s, offset 0x%x)\n", slice, |
1da177e4 LT |
227 | (pt_entry->pt_name) ? pt_entry->pt_name : "unknown", |
228 | sblock); | |
229 | #endif | |
230 | } | |
014c2544 | 231 | return sblock; |
1da177e4 LT |
232 | } |
233 | ||
234 | static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) { | |
235 | ||
014c2544 JJ |
236 | if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic))) |
237 | return -1; | |
1da177e4 LT |
238 | |
239 | sb->fs_magic = be32_to_cpu(super->fs_magic); | |
240 | sb->total_blocks = be32_to_cpu(super->fs_size); | |
241 | sb->first_block = be32_to_cpu(super->fs_firstcg); | |
242 | sb->group_size = be32_to_cpu(super->fs_cgfsize); | |
243 | sb->data_free = be32_to_cpu(super->fs_tfree); | |
244 | sb->inode_free = be32_to_cpu(super->fs_tinode); | |
245 | sb->inode_blocks = be16_to_cpu(super->fs_cgisize); | |
246 | sb->total_groups = be16_to_cpu(super->fs_ncg); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static int efs_fill_super(struct super_block *s, void *d, int silent) | |
252 | { | |
253 | struct efs_sb_info *sb; | |
254 | struct buffer_head *bh; | |
255 | struct inode *root; | |
256 | ||
f8314dc6 | 257 | sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL); |
1da177e4 LT |
258 | if (!sb) |
259 | return -ENOMEM; | |
260 | s->s_fs_info = sb; | |
22b13969 DD |
261 | s->s_time_min = 0; |
262 | s->s_time_max = U32_MAX; | |
1da177e4 LT |
263 | |
264 | s->s_magic = EFS_SUPER_MAGIC; | |
265 | if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) { | |
f403d1db | 266 | pr_err("device does not support %d byte blocks\n", |
1da177e4 | 267 | EFS_BLOCKSIZE); |
5a9ed6f5 | 268 | return -EINVAL; |
1da177e4 LT |
269 | } |
270 | ||
271 | /* read the vh (volume header) block */ | |
272 | bh = sb_bread(s, 0); | |
273 | ||
274 | if (!bh) { | |
f403d1db | 275 | pr_err("cannot read volume header\n"); |
4108124f | 276 | return -EIO; |
1da177e4 LT |
277 | } |
278 | ||
279 | /* | |
280 | * if this returns zero then we didn't find any partition table. | |
281 | * this isn't (yet) an error - just assume for the moment that | |
282 | * the device is valid and go on to search for a superblock. | |
283 | */ | |
284 | sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data); | |
285 | brelse(bh); | |
286 | ||
287 | if (sb->fs_start == -1) { | |
5a9ed6f5 | 288 | return -EINVAL; |
1da177e4 LT |
289 | } |
290 | ||
291 | bh = sb_bread(s, sb->fs_start + EFS_SUPER); | |
292 | if (!bh) { | |
f403d1db | 293 | pr_err("cannot read superblock\n"); |
4108124f | 294 | return -EIO; |
1da177e4 LT |
295 | } |
296 | ||
297 | if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) { | |
298 | #ifdef DEBUG | |
f403d1db FF |
299 | pr_warn("invalid superblock at block %u\n", |
300 | sb->fs_start + EFS_SUPER); | |
1da177e4 LT |
301 | #endif |
302 | brelse(bh); | |
5a9ed6f5 | 303 | return -EINVAL; |
1da177e4 LT |
304 | } |
305 | brelse(bh); | |
306 | ||
bc98a42c | 307 | if (!sb_rdonly(s)) { |
1da177e4 | 308 | #ifdef DEBUG |
f403d1db | 309 | pr_info("forcing read-only mode\n"); |
1da177e4 | 310 | #endif |
1751e8a6 | 311 | s->s_flags |= SB_RDONLY; |
1da177e4 LT |
312 | } |
313 | s->s_op = &efs_superblock_operations; | |
314 | s->s_export_op = &efs_export_ops; | |
298384cd DH |
315 | root = efs_iget(s, EFS_ROOTINODE); |
316 | if (IS_ERR(root)) { | |
f403d1db | 317 | pr_err("get root inode failed\n"); |
5a9ed6f5 | 318 | return PTR_ERR(root); |
298384cd DH |
319 | } |
320 | ||
48fde701 | 321 | s->s_root = d_make_root(root); |
1da177e4 | 322 | if (!(s->s_root)) { |
f403d1db | 323 | pr_err("get root dentry failed\n"); |
5a9ed6f5 | 324 | return -ENOMEM; |
1da177e4 LT |
325 | } |
326 | ||
327 | return 0; | |
1da177e4 LT |
328 | } |
329 | ||
726c3342 | 330 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) { |
514c91a9 CL |
331 | struct super_block *sb = dentry->d_sb; |
332 | struct efs_sb_info *sbi = SUPER_INFO(sb); | |
333 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
334 | |
335 | buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */ | |
336 | buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */ | |
514c91a9 CL |
337 | buf->f_blocks = sbi->total_groups * /* total data blocks */ |
338 | (sbi->group_size - sbi->inode_blocks); | |
339 | buf->f_bfree = sbi->data_free; /* free data blocks */ | |
340 | buf->f_bavail = sbi->data_free; /* free blocks for non-root */ | |
341 | buf->f_files = sbi->total_groups * /* total inodes */ | |
342 | sbi->inode_blocks * | |
1da177e4 | 343 | (EFS_BLOCKSIZE / sizeof(struct efs_dinode)); |
514c91a9 | 344 | buf->f_ffree = sbi->inode_free; /* free inodes */ |
6d1349c7 | 345 | buf->f_fsid = u64_to_fsid(id); |
1da177e4 LT |
346 | buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */ |
347 | ||
348 | return 0; | |
349 | } | |
350 |