blob: e0a6839e68ae0f53f762a5f4aed8466b6d1d98ff [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
David Howells726c3342006-06-23 02:02:58 -070018static int efs_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070019static int efs_fill_super(struct super_block *s, void *d, int silent);
20
David Howells454e2392006-06-23 02:02:57 -070021static int efs_get_sb(struct file_system_type *fs_type,
22 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023{
David Howells454e2392006-06-23 02:02:57 -070024 return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025}
26
27static 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
35static 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
Christoph Lametere18b8902006-12-06 20:33:20 -080055static struct kmem_cache * efs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57static struct inode *efs_alloc_inode(struct super_block *sb)
58{
59 struct efs_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080060 ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 if (!ei)
62 return NULL;
63 return &ei->vfs_inode;
64}
65
66static void efs_destroy_inode(struct inode *inode)
67{
68 kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
69}
70
Christoph Lametere18b8902006-12-06 20:33:20 -080071static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
73 struct efs_inode_info *ei = (struct efs_inode_info *) foo;
74
Christoph Lametera35afb82007-05-16 22:10:57 -070075 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
78static int init_inodecache(void)
79{
80 efs_inode_cachep = kmem_cache_create("efs_inode_cache",
81 sizeof(struct efs_inode_info),
Paul Jackson4b6a9312006-03-24 03:16:05 -080082 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 init_once, NULL);
84 if (efs_inode_cachep == NULL)
85 return -ENOMEM;
86 return 0;
87}
88
89static void destroy_inodecache(void)
90{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070091 kmem_cache_destroy(efs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
94static void efs_put_super(struct super_block *s)
95{
96 kfree(s->s_fs_info);
97 s->s_fs_info = NULL;
98}
99
100static int efs_remount(struct super_block *sb, int *flags, char *data)
101{
102 *flags |= MS_RDONLY;
103 return 0;
104}
105
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800106static const struct super_operations efs_superblock_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 .alloc_inode = efs_alloc_inode,
108 .destroy_inode = efs_destroy_inode,
109 .read_inode = efs_read_inode,
110 .put_super = efs_put_super,
111 .statfs = efs_statfs,
112 .remount_fs = efs_remount,
113};
114
115static struct export_operations efs_export_ops = {
116 .get_parent = efs_get_parent,
117};
118
119static int __init init_efs_fs(void) {
120 int err;
121 printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
122 err = init_inodecache();
123 if (err)
124 goto out1;
125 err = register_filesystem(&efs_fs_type);
126 if (err)
127 goto out;
128 return 0;
129out:
130 destroy_inodecache();
131out1:
132 return err;
133}
134
135static void __exit exit_efs_fs(void) {
136 unregister_filesystem(&efs_fs_type);
137 destroy_inodecache();
138}
139
140module_init(init_efs_fs)
141module_exit(exit_efs_fs)
142
143static efs_block_t efs_validate_vh(struct volume_header *vh) {
144 int i;
145 __be32 cs, *ui;
146 int csum;
147 efs_block_t sblock = 0; /* shuts up gcc */
148 struct pt_types *pt_entry;
149 int pt_type, slice = -1;
150
151 if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
152 /*
153 * assume that we're dealing with a partition and allow
154 * read_super() to try and detect a valid superblock
155 * on the next block.
156 */
157 return 0;
158 }
159
160 ui = ((__be32 *) (vh + 1)) - 1;
161 for(csum = 0; ui >= ((__be32 *) vh);) {
162 cs = *ui--;
163 csum += be32_to_cpu(cs);
164 }
165 if (csum) {
166 printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n");
167 return 0;
168 }
169
170#ifdef DEBUG
171 printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile);
172
173 for(i = 0; i < NVDIR; i++) {
174 int j;
175 char name[VDNAMESIZE+1];
176
177 for(j = 0; j < VDNAMESIZE; j++) {
178 name[j] = vh->vh_vd[i].vd_name[j];
179 }
180 name[j] = (char) 0;
181
182 if (name[0]) {
183 printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n",
184 name,
185 (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
186 (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
187 }
188 }
189#endif
190
191 for(i = 0; i < NPARTAB; i++) {
192 pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
193 for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
194 if (pt_type == pt_entry->pt_type) break;
195 }
196#ifdef DEBUG
197 if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
198 printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
199 i,
200 (int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
201 (int) be32_to_cpu(vh->vh_pt[i].pt_nblks),
202 pt_type,
203 (pt_entry->pt_name) ? pt_entry->pt_name : "unknown");
204 }
205#endif
206 if (IS_EFS(pt_type)) {
207 sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
208 slice = i;
209 }
210 }
211
212 if (slice == -1) {
213 printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n");
214#ifdef DEBUG
215 } else {
216 printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n",
217 slice,
218 (pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
219 sblock);
220#endif
221 }
Jesper Juhl014c2542006-01-15 02:37:08 +0100222 return sblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {
226
Jesper Juhl014c2542006-01-15 02:37:08 +0100227 if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
228 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 sb->fs_magic = be32_to_cpu(super->fs_magic);
231 sb->total_blocks = be32_to_cpu(super->fs_size);
232 sb->first_block = be32_to_cpu(super->fs_firstcg);
233 sb->group_size = be32_to_cpu(super->fs_cgfsize);
234 sb->data_free = be32_to_cpu(super->fs_tfree);
235 sb->inode_free = be32_to_cpu(super->fs_tinode);
236 sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
237 sb->total_groups = be16_to_cpu(super->fs_ncg);
238
239 return 0;
240}
241
242static int efs_fill_super(struct super_block *s, void *d, int silent)
243{
244 struct efs_sb_info *sb;
245 struct buffer_head *bh;
246 struct inode *root;
247
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700248 sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 if (!sb)
250 return -ENOMEM;
251 s->s_fs_info = sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253 s->s_magic = EFS_SUPER_MAGIC;
254 if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
255 printk(KERN_ERR "EFS: device does not support %d byte blocks\n",
256 EFS_BLOCKSIZE);
257 goto out_no_fs_ul;
258 }
259
260 /* read the vh (volume header) block */
261 bh = sb_bread(s, 0);
262
263 if (!bh) {
264 printk(KERN_ERR "EFS: cannot read volume header\n");
265 goto out_no_fs_ul;
266 }
267
268 /*
269 * if this returns zero then we didn't find any partition table.
270 * this isn't (yet) an error - just assume for the moment that
271 * the device is valid and go on to search for a superblock.
272 */
273 sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
274 brelse(bh);
275
276 if (sb->fs_start == -1) {
277 goto out_no_fs_ul;
278 }
279
280 bh = sb_bread(s, sb->fs_start + EFS_SUPER);
281 if (!bh) {
282 printk(KERN_ERR "EFS: cannot read superblock\n");
283 goto out_no_fs_ul;
284 }
285
286 if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
287#ifdef DEBUG
288 printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER);
289#endif
290 brelse(bh);
291 goto out_no_fs_ul;
292 }
293 brelse(bh);
294
295 if (!(s->s_flags & MS_RDONLY)) {
296#ifdef DEBUG
297 printk(KERN_INFO "EFS: forcing read-only mode\n");
298#endif
299 s->s_flags |= MS_RDONLY;
300 }
301 s->s_op = &efs_superblock_operations;
302 s->s_export_op = &efs_export_ops;
303 root = iget(s, EFS_ROOTINODE);
304 s->s_root = d_alloc_root(root);
305
306 if (!(s->s_root)) {
307 printk(KERN_ERR "EFS: get root inode failed\n");
308 iput(root);
309 goto out_no_fs;
310 }
311
312 return 0;
313
314out_no_fs_ul:
315out_no_fs:
316 s->s_fs_info = NULL;
317 kfree(sb);
318 return -EINVAL;
319}
320
David Howells726c3342006-06-23 02:02:58 -0700321static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
322 struct efs_sb_info *sb = SUPER_INFO(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
325 buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
326 buf->f_blocks = sb->total_groups * /* total data blocks */
327 (sb->group_size - sb->inode_blocks);
328 buf->f_bfree = sb->data_free; /* free data blocks */
329 buf->f_bavail = sb->data_free; /* free blocks for non-root */
330 buf->f_files = sb->total_groups * /* total inodes */
331 sb->inode_blocks *
332 (EFS_BLOCKSIZE / sizeof(struct efs_dinode));
333 buf->f_ffree = sb->inode_free; /* free inodes */
334 buf->f_fsid.val[0] = (sb->fs_magic >> 16) & 0xffff; /* fs ID */
335 buf->f_fsid.val[1] = sb->fs_magic & 0xffff; /* fs ID */
336 buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */
337
338 return 0;
339}
340