4 * Copyright (c) 1999 Al Smith
6 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
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>
18 static struct super_block *efs_get_sb(struct file_system_type *fs_type,
19 int flags, const char *dev_name, void *data)
21 return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super);
24 static struct file_system_type efs_fs_type = {
28 .kill_sb = kill_block_super,
29 .fs_flags = FS_REQUIRES_DEV,
32 static kmem_cache_t * efs_inode_cachep;
34 static struct inode *efs_alloc_inode(struct super_block *sb)
36 struct efs_inode_info *ei;
37 ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, SLAB_KERNEL);
40 return &ei->vfs_inode;
43 static void efs_destroy_inode(struct inode *inode)
45 kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
48 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
50 struct efs_inode_info *ei = (struct efs_inode_info *) foo;
52 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
53 SLAB_CTOR_CONSTRUCTOR)
54 inode_init_once(&ei->vfs_inode);
57 static int init_inodecache(void)
59 efs_inode_cachep = kmem_cache_create("efs_inode_cache",
60 sizeof(struct efs_inode_info),
61 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
63 if (efs_inode_cachep == NULL)
68 static void destroy_inodecache(void)
70 if (kmem_cache_destroy(efs_inode_cachep))
71 printk(KERN_INFO "efs_inode_cache: not all structures were freed\n");
74 void efs_put_super(struct super_block *s)
80 static int efs_remount(struct super_block *sb, int *flags, char *data)
86 static struct super_operations efs_superblock_operations = {
87 .alloc_inode = efs_alloc_inode,
88 .destroy_inode = efs_destroy_inode,
89 .read_inode = efs_read_inode,
90 .put_super = efs_put_super,
92 .remount_fs = efs_remount,
95 static int __init init_efs_fs(void) {
97 printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
98 err = init_inodecache();
101 err = register_filesystem(&efs_fs_type);
106 destroy_inodecache();
111 static void __exit exit_efs_fs(void) {
112 unregister_filesystem(&efs_fs_type);
113 destroy_inodecache();
116 module_init(init_efs_fs)
117 module_exit(exit_efs_fs)
119 static efs_block_t efs_validate_vh(struct volume_header *vh) {
121 unsigned int cs, csum, *ui;
122 efs_block_t sblock = 0; /* shuts up gcc */
123 struct pt_types *pt_entry;
124 int pt_type, slice = -1;
126 if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
128 * assume that we're dealing with a partition and allow
129 * read_super() to try and detect a valid superblock
135 ui = ((unsigned int *) (vh + 1)) - 1;
136 for(csum = 0; ui >= ((unsigned int *) vh);) {
138 csum += be32_to_cpu(cs);
141 printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n");
146 printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile);
148 for(i = 0; i < NVDIR; i++) {
150 char name[VDNAMESIZE+1];
152 for(j = 0; j < VDNAMESIZE; j++) {
153 name[j] = vh->vh_vd[i].vd_name[j];
158 printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n",
160 (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
161 (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
166 for(i = 0; i < NPARTAB; i++) {
167 pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
168 for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
169 if (pt_type == pt_entry->pt_type) break;
172 if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
173 printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
175 (int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
176 (int) be32_to_cpu(vh->vh_pt[i].pt_nblks),
178 (pt_entry->pt_name) ? pt_entry->pt_name : "unknown");
181 if (IS_EFS(pt_type)) {
182 sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
188 printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n");
191 printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n",
193 (pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
200 static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {
202 if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic))) return -1;
204 sb->fs_magic = be32_to_cpu(super->fs_magic);
205 sb->total_blocks = be32_to_cpu(super->fs_size);
206 sb->first_block = be32_to_cpu(super->fs_firstcg);
207 sb->group_size = be32_to_cpu(super->fs_cgfsize);
208 sb->data_free = be32_to_cpu(super->fs_tfree);
209 sb->inode_free = be32_to_cpu(super->fs_tinode);
210 sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
211 sb->total_groups = be16_to_cpu(super->fs_ncg);
216 int efs_fill_super(struct super_block *s, void *d, int silent)
218 struct efs_sb_info *sb;
219 struct buffer_head *bh;
222 sb = kmalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
226 memset(sb, 0, sizeof(struct efs_sb_info));
228 s->s_magic = EFS_SUPER_MAGIC;
229 if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
230 printk(KERN_ERR "EFS: device does not support %d byte blocks\n",
235 /* read the vh (volume header) block */
239 printk(KERN_ERR "EFS: cannot read volume header\n");
244 * if this returns zero then we didn't find any partition table.
245 * this isn't (yet) an error - just assume for the moment that
246 * the device is valid and go on to search for a superblock.
248 sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
251 if (sb->fs_start == -1) {
255 bh = sb_bread(s, sb->fs_start + EFS_SUPER);
257 printk(KERN_ERR "EFS: cannot read superblock\n");
261 if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
263 printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER);
270 if (!(s->s_flags & MS_RDONLY)) {
272 printk(KERN_INFO "EFS: forcing read-only mode\n");
274 s->s_flags |= MS_RDONLY;
276 s->s_op = &efs_superblock_operations;
277 root = iget(s, EFS_ROOTINODE);
278 s->s_root = d_alloc_root(root);
281 printk(KERN_ERR "EFS: get root inode failed\n");
295 int efs_statfs(struct super_block *s, struct kstatfs *buf) {
296 struct efs_sb_info *sb = SUPER_INFO(s);
298 buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
299 buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
300 buf->f_blocks = sb->total_groups * /* total data blocks */
301 (sb->group_size - sb->inode_blocks);
302 buf->f_bfree = sb->data_free; /* free data blocks */
303 buf->f_bavail = sb->data_free; /* free blocks for non-root */
304 buf->f_files = sb->total_groups * /* total inodes */
306 (EFS_BLOCKSIZE / sizeof(struct efs_dinode));
307 buf->f_ffree = sb->inode_free; /* free inodes */
308 buf->f_fsid.val[0] = (sb->fs_magic >> 16) & 0xffff; /* fs ID */
309 buf->f_fsid.val[1] = sb->fs_magic & 0xffff; /* fs ID */
310 buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */