Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 18 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | static int efs_fill_super(struct super_block *s, void *d, int silent); |
| 20 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 21 | static int efs_get_sb(struct file_system_type *fs_type, |
| 22 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 24 | return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 55 | static struct kmem_cache * efs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | static struct inode *efs_alloc_inode(struct super_block *sb) |
| 58 | { |
| 59 | struct efs_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 60 | ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 71 | static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
| 73 | struct efs_inode_info *ei = (struct efs_inode_info *) foo; |
| 74 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 75 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | static int init_inodecache(void) |
| 79 | { |
| 80 | efs_inode_cachep = kmem_cache_create("efs_inode_cache", |
| 81 | sizeof(struct efs_inode_info), |
Paul Jackson | 4b6a931 | 2006-03-24 03:16:05 -0800 | [diff] [blame] | 82 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | init_once, NULL); |
| 84 | if (efs_inode_cachep == NULL) |
| 85 | return -ENOMEM; |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static void destroy_inodecache(void) |
| 90 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 91 | kmem_cache_destroy(efs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | static void efs_put_super(struct super_block *s) |
| 95 | { |
| 96 | kfree(s->s_fs_info); |
| 97 | s->s_fs_info = NULL; |
| 98 | } |
| 99 | |
| 100 | static int efs_remount(struct super_block *sb, int *flags, char *data) |
| 101 | { |
| 102 | *flags |= MS_RDONLY; |
| 103 | return 0; |
| 104 | } |
| 105 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 106 | static const struct super_operations efs_superblock_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | .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 | |
| 115 | static struct export_operations efs_export_ops = { |
| 116 | .get_parent = efs_get_parent, |
| 117 | }; |
| 118 | |
| 119 | static 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; |
| 129 | out: |
| 130 | destroy_inodecache(); |
| 131 | out1: |
| 132 | return err; |
| 133 | } |
| 134 | |
| 135 | static void __exit exit_efs_fs(void) { |
| 136 | unregister_filesystem(&efs_fs_type); |
| 137 | destroy_inodecache(); |
| 138 | } |
| 139 | |
| 140 | module_init(init_efs_fs) |
| 141 | module_exit(exit_efs_fs) |
| 142 | |
| 143 | static 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 Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 222 | return sblock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) { |
| 226 | |
Jesper Juhl | 014c254 | 2006-01-15 02:37:08 +0100 | [diff] [blame] | 227 | if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic))) |
| 228 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
| 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 | |
| 242 | static 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 Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 248 | sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | if (!sb) |
| 250 | return -ENOMEM; |
| 251 | s->s_fs_info = sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 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 | |
| 314 | out_no_fs_ul: |
| 315 | out_no_fs: |
| 316 | s->s_fs_info = NULL; |
| 317 | kfree(sb); |
| 318 | return -EINVAL; |
| 319 | } |
| 320 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 321 | static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) { |
| 322 | struct efs_sb_info *sb = SUPER_INFO(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 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 | |