Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/bfs/inode.c |
| 3 | * BFS superblock and inode operations. |
| 4 | * Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com> |
| 5 | * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 6 | * |
| 7 | * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/fs.h> |
| 15 | #include <linux/smp_lock.h> |
| 16 | #include <linux/buffer_head.h> |
| 17 | #include <linux/vfs.h> |
| 18 | #include <asm/uaccess.h> |
| 19 | #include "bfs.h" |
| 20 | |
| 21 | MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>"); |
| 22 | MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); |
| 23 | MODULE_LICENSE("GPL"); |
| 24 | |
| 25 | #undef DEBUG |
| 26 | |
| 27 | #ifdef DEBUG |
| 28 | #define dprintf(x...) printf(x) |
| 29 | #else |
| 30 | #define dprintf(x...) |
| 31 | #endif |
| 32 | |
| 33 | void dump_imap(const char *prefix, struct super_block * s); |
| 34 | |
| 35 | static void bfs_read_inode(struct inode * inode) |
| 36 | { |
| 37 | unsigned long ino = inode->i_ino; |
| 38 | struct bfs_inode * di; |
| 39 | struct buffer_head * bh; |
| 40 | int block, off; |
| 41 | |
| 42 | if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { |
| 43 | printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); |
| 44 | make_bad_inode(inode); |
| 45 | return; |
| 46 | } |
| 47 | |
| 48 | block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; |
| 49 | bh = sb_bread(inode->i_sb, block); |
| 50 | if (!bh) { |
| 51 | printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); |
| 52 | make_bad_inode(inode); |
| 53 | return; |
| 54 | } |
| 55 | |
| 56 | off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; |
| 57 | di = (struct bfs_inode *)bh->b_data + off; |
| 58 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 59 | inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); |
| 60 | if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | inode->i_mode |= S_IFDIR; |
| 62 | inode->i_op = &bfs_dir_inops; |
| 63 | inode->i_fop = &bfs_dir_operations; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 64 | } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | inode->i_mode |= S_IFREG; |
| 66 | inode->i_op = &bfs_file_inops; |
| 67 | inode->i_fop = &bfs_file_operations; |
| 68 | inode->i_mapping->a_ops = &bfs_aops; |
| 69 | } |
| 70 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 71 | BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); |
| 72 | BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); |
| 73 | inode->i_uid = le32_to_cpu(di->i_uid); |
| 74 | inode->i_gid = le32_to_cpu(di->i_gid); |
| 75 | inode->i_nlink = le32_to_cpu(di->i_nlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | inode->i_size = BFS_FILESIZE(di); |
| 77 | inode->i_blocks = BFS_FILEBLOCKS(di); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 78 | if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | inode->i_blksize = PAGE_SIZE; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 80 | inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); |
| 81 | inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); |
| 82 | inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | inode->i_atime.tv_nsec = 0; |
| 84 | inode->i_mtime.tv_nsec = 0; |
| 85 | inode->i_ctime.tv_nsec = 0; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 86 | BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | brelse(bh); |
| 89 | } |
| 90 | |
| 91 | static int bfs_write_inode(struct inode * inode, int unused) |
| 92 | { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 93 | unsigned int ino = (u16)inode->i_ino; |
| 94 | unsigned long i_sblock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | struct bfs_inode * di; |
| 96 | struct buffer_head * bh; |
| 97 | int block, off; |
| 98 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 99 | dprintf("ino=%08x\n", ino); |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 102 | printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | return -EIO; |
| 104 | } |
| 105 | |
| 106 | lock_kernel(); |
| 107 | block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; |
| 108 | bh = sb_bread(inode->i_sb, block); |
| 109 | if (!bh) { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 110 | printf("Unable to read inode %s:%08x\n", inode->i_sb->s_id, ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | unlock_kernel(); |
| 112 | return -EIO; |
| 113 | } |
| 114 | |
| 115 | off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; |
| 116 | di = (struct bfs_inode *)bh->b_data + off; |
| 117 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 118 | if (ino == BFS_ROOT_INO) |
| 119 | di->i_vtype = cpu_to_le32(BFS_VDIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | else |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 121 | di->i_vtype = cpu_to_le32(BFS_VREG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 123 | di->i_ino = cpu_to_le16(ino); |
| 124 | di->i_mode = cpu_to_le32(inode->i_mode); |
| 125 | di->i_uid = cpu_to_le32(inode->i_uid); |
| 126 | di->i_gid = cpu_to_le32(inode->i_gid); |
| 127 | di->i_nlink = cpu_to_le32(inode->i_nlink); |
| 128 | di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); |
| 129 | di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); |
| 130 | di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); |
| 131 | i_sblock = BFS_I(inode)->i_sblock; |
| 132 | di->i_sblock = cpu_to_le32(i_sblock); |
| 133 | di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); |
| 134 | di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
| 136 | mark_buffer_dirty(bh); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 137 | dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | brelse(bh); |
| 139 | unlock_kernel(); |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static void bfs_delete_inode(struct inode * inode) |
| 144 | { |
| 145 | unsigned long ino = inode->i_ino; |
| 146 | struct bfs_inode * di; |
| 147 | struct buffer_head * bh; |
| 148 | int block, off; |
| 149 | struct super_block * s = inode->i_sb; |
| 150 | struct bfs_sb_info * info = BFS_SB(s); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 151 | struct bfs_inode_info * bi = BFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 153 | dprintf("ino=%08lx\n", ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Mark Fasheh | fef2665 | 2005-09-09 13:01:31 -0700 | [diff] [blame] | 155 | truncate_inode_pages(&inode->i_data, 0); |
| 156 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 157 | if (ino < BFS_ROOT_INO || ino > info->si_lasti) { |
| 158 | printf("invalid ino=%08lx\n", ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | return; |
| 160 | } |
| 161 | |
| 162 | inode->i_size = 0; |
| 163 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
| 164 | lock_kernel(); |
| 165 | mark_inode_dirty(inode); |
| 166 | block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; |
| 167 | bh = sb_bread(s, block); |
| 168 | if (!bh) { |
| 169 | printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); |
| 170 | unlock_kernel(); |
| 171 | return; |
| 172 | } |
| 173 | off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 174 | di = (struct bfs_inode *) bh->b_data + off; |
| 175 | if (bi->i_dsk_ino) { |
| 176 | info->si_freeb += 1 + bi->i_eblock - bi->i_sblock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | info->si_freei++; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 178 | clear_bit(ino, info->si_imap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | dump_imap("delete_inode", s); |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | di->i_ino = 0; |
| 182 | di->i_sblock = 0; |
| 183 | mark_buffer_dirty(bh); |
| 184 | brelse(bh); |
| 185 | |
| 186 | /* if this was the last file, make the previous |
| 187 | block "last files last block" even if there is no real file there, |
| 188 | saves us 1 gap */ |
| 189 | if (info->si_lf_eblk == BFS_I(inode)->i_eblock) { |
| 190 | info->si_lf_eblk = BFS_I(inode)->i_sblock - 1; |
| 191 | mark_buffer_dirty(info->si_sbh); |
| 192 | } |
| 193 | unlock_kernel(); |
| 194 | clear_inode(inode); |
| 195 | } |
| 196 | |
| 197 | static void bfs_put_super(struct super_block *s) |
| 198 | { |
| 199 | struct bfs_sb_info *info = BFS_SB(s); |
| 200 | brelse(info->si_sbh); |
| 201 | kfree(info->si_imap); |
| 202 | kfree(info); |
| 203 | s->s_fs_info = NULL; |
| 204 | } |
| 205 | |
| 206 | static int bfs_statfs(struct super_block *s, struct kstatfs *buf) |
| 207 | { |
| 208 | struct bfs_sb_info *info = BFS_SB(s); |
| 209 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
| 210 | buf->f_type = BFS_MAGIC; |
| 211 | buf->f_bsize = s->s_blocksize; |
| 212 | buf->f_blocks = info->si_blocks; |
| 213 | buf->f_bfree = buf->f_bavail = info->si_freeb; |
| 214 | buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; |
| 215 | buf->f_ffree = info->si_freei; |
| 216 | buf->f_fsid.val[0] = (u32)id; |
| 217 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 218 | buf->f_namelen = BFS_NAMELEN; |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | static void bfs_write_super(struct super_block *s) |
| 223 | { |
| 224 | lock_kernel(); |
| 225 | if (!(s->s_flags & MS_RDONLY)) |
| 226 | mark_buffer_dirty(BFS_SB(s)->si_sbh); |
| 227 | s->s_dirt = 0; |
| 228 | unlock_kernel(); |
| 229 | } |
| 230 | |
| 231 | static kmem_cache_t * bfs_inode_cachep; |
| 232 | |
| 233 | static struct inode *bfs_alloc_inode(struct super_block *sb) |
| 234 | { |
| 235 | struct bfs_inode_info *bi; |
| 236 | bi = kmem_cache_alloc(bfs_inode_cachep, SLAB_KERNEL); |
| 237 | if (!bi) |
| 238 | return NULL; |
| 239 | return &bi->vfs_inode; |
| 240 | } |
| 241 | |
| 242 | static void bfs_destroy_inode(struct inode *inode) |
| 243 | { |
| 244 | kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); |
| 245 | } |
| 246 | |
| 247 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
| 248 | { |
| 249 | struct bfs_inode_info *bi = foo; |
| 250 | |
| 251 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 252 | SLAB_CTOR_CONSTRUCTOR) |
| 253 | inode_init_once(&bi->vfs_inode); |
| 254 | } |
| 255 | |
| 256 | static int init_inodecache(void) |
| 257 | { |
| 258 | bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", |
| 259 | sizeof(struct bfs_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 260 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 261 | SLAB_MEM_SPREAD), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | init_once, NULL); |
| 263 | if (bfs_inode_cachep == NULL) |
| 264 | return -ENOMEM; |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static void destroy_inodecache(void) |
| 269 | { |
| 270 | if (kmem_cache_destroy(bfs_inode_cachep)) |
| 271 | printk(KERN_INFO "bfs_inode_cache: not all structures were freed\n"); |
| 272 | } |
| 273 | |
| 274 | static struct super_operations bfs_sops = { |
| 275 | .alloc_inode = bfs_alloc_inode, |
| 276 | .destroy_inode = bfs_destroy_inode, |
| 277 | .read_inode = bfs_read_inode, |
| 278 | .write_inode = bfs_write_inode, |
| 279 | .delete_inode = bfs_delete_inode, |
| 280 | .put_super = bfs_put_super, |
| 281 | .write_super = bfs_write_super, |
| 282 | .statfs = bfs_statfs, |
| 283 | }; |
| 284 | |
| 285 | void dump_imap(const char *prefix, struct super_block * s) |
| 286 | { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 287 | #ifdef DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | int i; |
| 289 | char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); |
| 290 | |
| 291 | if (!tmpbuf) |
| 292 | return; |
| 293 | for (i=BFS_SB(s)->si_lasti; i>=0; i--) { |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 294 | if (i > PAGE_SIZE-100) break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | if (test_bit(i, BFS_SB(s)->si_imap)) |
| 296 | strcat(tmpbuf, "1"); |
| 297 | else |
| 298 | strcat(tmpbuf, "0"); |
| 299 | } |
| 300 | printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); |
| 301 | free_page((unsigned long)tmpbuf); |
| 302 | #endif |
| 303 | } |
| 304 | |
| 305 | static int bfs_fill_super(struct super_block *s, void *data, int silent) |
| 306 | { |
| 307 | struct buffer_head * bh; |
| 308 | struct bfs_super_block * bfs_sb; |
| 309 | struct inode * inode; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 310 | unsigned i, imap_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | struct bfs_sb_info * info; |
| 312 | |
| 313 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
| 314 | if (!info) |
| 315 | return -ENOMEM; |
| 316 | s->s_fs_info = info; |
| 317 | memset(info, 0, sizeof(*info)); |
| 318 | |
| 319 | sb_set_blocksize(s, BFS_BSIZE); |
| 320 | |
| 321 | bh = sb_bread(s, 0); |
| 322 | if(!bh) |
| 323 | goto out; |
| 324 | bfs_sb = (struct bfs_super_block *)bh->b_data; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 325 | if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | if (!silent) |
| 327 | printf("No BFS filesystem on %s (magic=%08x)\n", |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 328 | s->s_id, le32_to_cpu(bfs_sb->s_magic)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | goto out; |
| 330 | } |
| 331 | if (BFS_UNCLEAN(bfs_sb, s) && !silent) |
| 332 | printf("%s is unclean, continuing\n", s->s_id); |
| 333 | |
| 334 | s->s_magic = BFS_MAGIC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | info->si_sbh = bh; |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 336 | info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | + BFS_ROOT_INO - 1; |
| 338 | |
| 339 | imap_len = info->si_lasti/8 + 1; |
| 340 | info->si_imap = kmalloc(imap_len, GFP_KERNEL); |
| 341 | if (!info->si_imap) |
| 342 | goto out; |
| 343 | memset(info->si_imap, 0, imap_len); |
| 344 | for (i=0; i<BFS_ROOT_INO; i++) |
| 345 | set_bit(i, info->si_imap); |
| 346 | |
| 347 | s->s_op = &bfs_sops; |
| 348 | inode = iget(s, BFS_ROOT_INO); |
| 349 | if (!inode) { |
| 350 | kfree(info->si_imap); |
| 351 | goto out; |
| 352 | } |
| 353 | s->s_root = d_alloc_root(inode); |
| 354 | if (!s->s_root) { |
| 355 | iput(inode); |
| 356 | kfree(info->si_imap); |
| 357 | goto out; |
| 358 | } |
| 359 | |
Andrew Stribblehill | fac92be | 2005-09-09 13:02:04 -0700 | [diff] [blame] | 360 | info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */ |
Alexey Dobriyan | ce0fe7e | 2005-10-04 17:43:06 +0100 | [diff] [blame] | 361 | info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | info->si_freei = 0; |
| 363 | info->si_lf_eblk = 0; |
| 364 | info->si_lf_sblk = 0; |
| 365 | info->si_lf_ioff = 0; |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 366 | bh = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) { |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 368 | struct bfs_inode *di; |
| 369 | int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; |
| 370 | int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; |
| 371 | unsigned long sblock, eblock; |
| 372 | |
| 373 | if (!off) { |
| 374 | brelse(bh); |
| 375 | bh = sb_bread(s, block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 377 | |
| 378 | if (!bh) |
| 379 | continue; |
| 380 | |
| 381 | di = (struct bfs_inode *)bh->b_data + off; |
| 382 | |
| 383 | if (!di->i_ino) { |
| 384 | info->si_freei++; |
| 385 | continue; |
| 386 | } |
| 387 | set_bit(i, info->si_imap); |
| 388 | info->si_freeb -= BFS_FILEBLOCKS(di); |
| 389 | |
| 390 | sblock = le32_to_cpu(di->i_sblock); |
| 391 | eblock = le32_to_cpu(di->i_eblock); |
| 392 | if (eblock > info->si_lf_eblk) { |
| 393 | info->si_lf_eblk = eblock; |
| 394 | info->si_lf_sblk = sblock; |
| 395 | info->si_lf_ioff = BFS_INO2OFF(i); |
| 396 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 398 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | if (!(s->s_flags & MS_RDONLY)) { |
Al Viro | c2b513d | 2005-10-04 17:48:44 +0100 | [diff] [blame] | 400 | mark_buffer_dirty(info->si_sbh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | s->s_dirt = 1; |
| 402 | } |
| 403 | dump_imap("read_super", s); |
| 404 | return 0; |
| 405 | |
| 406 | out: |
| 407 | brelse(bh); |
| 408 | kfree(info); |
| 409 | s->s_fs_info = NULL; |
| 410 | return -EINVAL; |
| 411 | } |
| 412 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame^] | 413 | static int bfs_get_sb(struct file_system_type *fs_type, |
| 414 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame^] | 416 | return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | static struct file_system_type bfs_fs_type = { |
| 420 | .owner = THIS_MODULE, |
| 421 | .name = "bfs", |
| 422 | .get_sb = bfs_get_sb, |
| 423 | .kill_sb = kill_block_super, |
| 424 | .fs_flags = FS_REQUIRES_DEV, |
| 425 | }; |
| 426 | |
| 427 | static int __init init_bfs_fs(void) |
| 428 | { |
| 429 | int err = init_inodecache(); |
| 430 | if (err) |
| 431 | goto out1; |
| 432 | err = register_filesystem(&bfs_fs_type); |
| 433 | if (err) |
| 434 | goto out; |
| 435 | return 0; |
| 436 | out: |
| 437 | destroy_inodecache(); |
| 438 | out1: |
| 439 | return err; |
| 440 | } |
| 441 | |
| 442 | static void __exit exit_bfs_fs(void) |
| 443 | { |
| 444 | unregister_filesystem(&bfs_fs_type); |
| 445 | destroy_inodecache(); |
| 446 | } |
| 447 | |
| 448 | module_init(init_bfs_fs) |
| 449 | module_exit(exit_bfs_fs) |