11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * fs/bfs/inode.c 31da177e4SLinus Torvalds * BFS superblock and inode operations. 469688262STigran Aivazian * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> 51da177e4SLinus Torvalds * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. 6fac92becSAndrew Stribblehill * 7fac92becSAndrew Stribblehill * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include <linux/module.h> 111da177e4SLinus Torvalds #include <linux/mm.h> 121da177e4SLinus Torvalds #include <linux/slab.h> 131da177e4SLinus Torvalds #include <linux/init.h> 141da177e4SLinus Torvalds #include <linux/fs.h> 151da177e4SLinus Torvalds #include <linux/smp_lock.h> 161da177e4SLinus Torvalds #include <linux/buffer_head.h> 171da177e4SLinus Torvalds #include <linux/vfs.h> 18a9185b41SChristoph Hellwig #include <linux/writeback.h> 191da177e4SLinus Torvalds #include <asm/uaccess.h> 201da177e4SLinus Torvalds #include "bfs.h" 211da177e4SLinus Torvalds 2269688262STigran Aivazian MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); 231da177e4SLinus Torvalds MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); 241da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #undef DEBUG 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #ifdef DEBUG 291da177e4SLinus Torvalds #define dprintf(x...) printf(x) 301da177e4SLinus Torvalds #else 311da177e4SLinus Torvalds #define dprintf(x...) 321da177e4SLinus Torvalds #endif 331da177e4SLinus Torvalds 348c85e125SChristoph Hellwig static void bfs_write_super(struct super_block *s); 351da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s); 361da177e4SLinus Torvalds 37e33ab086SDavid Howells struct inode *bfs_iget(struct super_block *sb, unsigned long ino) 381da177e4SLinus Torvalds { 391da177e4SLinus Torvalds struct bfs_inode *di; 40e33ab086SDavid Howells struct inode *inode; 411da177e4SLinus Torvalds struct buffer_head *bh; 421da177e4SLinus Torvalds int block, off; 431da177e4SLinus Torvalds 44e33ab086SDavid Howells inode = iget_locked(sb, ino); 45e33ab086SDavid Howells if (IS_ERR(inode)) 46e33ab086SDavid Howells return ERR_PTR(-ENOMEM); 47e33ab086SDavid Howells if (!(inode->i_state & I_NEW)) 48e33ab086SDavid Howells return inode; 49e33ab086SDavid Howells 50f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 511da177e4SLinus Torvalds printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); 52e33ab086SDavid Howells goto error; 531da177e4SLinus Torvalds } 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 561da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 571da177e4SLinus Torvalds if (!bh) { 58f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, 59f433dc56SDmitri Vorobiev ino); 60e33ab086SDavid Howells goto error; 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 641da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 651da177e4SLinus Torvalds 66fac92becSAndrew Stribblehill inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 67fac92becSAndrew Stribblehill if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 681da177e4SLinus Torvalds inode->i_mode |= S_IFDIR; 691da177e4SLinus Torvalds inode->i_op = &bfs_dir_inops; 701da177e4SLinus Torvalds inode->i_fop = &bfs_dir_operations; 71fac92becSAndrew Stribblehill } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 721da177e4SLinus Torvalds inode->i_mode |= S_IFREG; 731da177e4SLinus Torvalds inode->i_op = &bfs_file_inops; 741da177e4SLinus Torvalds inode->i_fop = &bfs_file_operations; 751da177e4SLinus Torvalds inode->i_mapping->a_ops = &bfs_aops; 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds 78fac92becSAndrew Stribblehill BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 79fac92becSAndrew Stribblehill BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 80f433dc56SDmitri Vorobiev BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); 81fac92becSAndrew Stribblehill inode->i_uid = le32_to_cpu(di->i_uid); 82fac92becSAndrew Stribblehill inode->i_gid = le32_to_cpu(di->i_gid); 83fac92becSAndrew Stribblehill inode->i_nlink = le32_to_cpu(di->i_nlink); 841da177e4SLinus Torvalds inode->i_size = BFS_FILESIZE(di); 851da177e4SLinus Torvalds inode->i_blocks = BFS_FILEBLOCKS(di); 86fac92becSAndrew Stribblehill inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 87fac92becSAndrew Stribblehill inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 88fac92becSAndrew Stribblehill inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 891da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0; 901da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; 911da177e4SLinus Torvalds inode->i_ctime.tv_nsec = 0; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds brelse(bh); 94e33ab086SDavid Howells unlock_new_inode(inode); 95e33ab086SDavid Howells return inode; 96e33ab086SDavid Howells 97e33ab086SDavid Howells error: 98e33ab086SDavid Howells iget_failed(inode); 99e33ab086SDavid Howells return ERR_PTR(-EIO); 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 102a9185b41SChristoph Hellwig static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) 1031da177e4SLinus Torvalds { 1044427f0c3SAl Viro struct bfs_sb_info *info = BFS_SB(inode->i_sb); 105fac92becSAndrew Stribblehill unsigned int ino = (u16)inode->i_ino; 106fac92becSAndrew Stribblehill unsigned long i_sblock; 1071da177e4SLinus Torvalds struct bfs_inode *di; 1081da177e4SLinus Torvalds struct buffer_head *bh; 1091da177e4SLinus Torvalds int block, off; 1104427f0c3SAl Viro int err = 0; 1111da177e4SLinus Torvalds 112fac92becSAndrew Stribblehill dprintf("ino=%08x\n", ino); 113fac92becSAndrew Stribblehill 114f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 115fac92becSAndrew Stribblehill printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); 1161da177e4SLinus Torvalds return -EIO; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1193f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1201da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 1211da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 1221da177e4SLinus Torvalds if (!bh) { 123f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08x\n", 124f433dc56SDmitri Vorobiev inode->i_sb->s_id, ino); 1253f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1261da177e4SLinus Torvalds return -EIO; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 1301da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 1311da177e4SLinus Torvalds 132fac92becSAndrew Stribblehill if (ino == BFS_ROOT_INO) 133fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VDIR); 1341da177e4SLinus Torvalds else 135fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VREG); 1361da177e4SLinus Torvalds 137fac92becSAndrew Stribblehill di->i_ino = cpu_to_le16(ino); 138fac92becSAndrew Stribblehill di->i_mode = cpu_to_le32(inode->i_mode); 139fac92becSAndrew Stribblehill di->i_uid = cpu_to_le32(inode->i_uid); 140fac92becSAndrew Stribblehill di->i_gid = cpu_to_le32(inode->i_gid); 141fac92becSAndrew Stribblehill di->i_nlink = cpu_to_le32(inode->i_nlink); 142fac92becSAndrew Stribblehill di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 143fac92becSAndrew Stribblehill di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 144fac92becSAndrew Stribblehill di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 145fac92becSAndrew Stribblehill i_sblock = BFS_I(inode)->i_sblock; 146fac92becSAndrew Stribblehill di->i_sblock = cpu_to_le32(i_sblock); 147fac92becSAndrew Stribblehill di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 148fac92becSAndrew Stribblehill di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds mark_buffer_dirty(bh); 151a9185b41SChristoph Hellwig if (wbc->sync_mode == WB_SYNC_ALL) { 1524427f0c3SAl Viro sync_dirty_buffer(bh); 1534427f0c3SAl Viro if (buffer_req(bh) && !buffer_uptodate(bh)) 1544427f0c3SAl Viro err = -EIO; 1554427f0c3SAl Viro } 1561da177e4SLinus Torvalds brelse(bh); 1573f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1584427f0c3SAl Viro return err; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds static void bfs_delete_inode(struct inode *inode) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds unsigned long ino = inode->i_ino; 1641da177e4SLinus Torvalds struct bfs_inode *di; 1651da177e4SLinus Torvalds struct buffer_head *bh; 1661da177e4SLinus Torvalds int block, off; 1671da177e4SLinus Torvalds struct super_block *s = inode->i_sb; 1681da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 169fac92becSAndrew Stribblehill struct bfs_inode_info *bi = BFS_I(inode); 1701da177e4SLinus Torvalds 171fac92becSAndrew Stribblehill dprintf("ino=%08lx\n", ino); 1721da177e4SLinus Torvalds 173fef26658SMark Fasheh truncate_inode_pages(&inode->i_data, 0); 174fef26658SMark Fasheh 175f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) { 176fac92becSAndrew Stribblehill printf("invalid ino=%08lx\n", ino); 1771da177e4SLinus Torvalds return; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds inode->i_size = 0; 1811da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; 1823f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1831da177e4SLinus Torvalds mark_inode_dirty(inode); 184f433dc56SDmitri Vorobiev 1851da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 1861da177e4SLinus Torvalds bh = sb_bread(s, block); 1871da177e4SLinus Torvalds if (!bh) { 188f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", 189f433dc56SDmitri Vorobiev inode->i_sb->s_id, ino); 1903f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1911da177e4SLinus Torvalds return; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 1941da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 195f433dc56SDmitri Vorobiev memset((void *)di, 0, sizeof(struct bfs_inode)); 196f433dc56SDmitri Vorobiev mark_buffer_dirty(bh); 197f433dc56SDmitri Vorobiev brelse(bh); 198f433dc56SDmitri Vorobiev 199fac92becSAndrew Stribblehill if (bi->i_dsk_ino) { 2007e46aa5cSAl Viro if (bi->i_sblock) 2017e46aa5cSAl Viro info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 2021da177e4SLinus Torvalds info->si_freei++; 203fac92becSAndrew Stribblehill clear_bit(ino, info->si_imap); 2041da177e4SLinus Torvalds dump_imap("delete_inode", s); 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 207f433dc56SDmitri Vorobiev /* 208f433dc56SDmitri Vorobiev * If this was the last file, make the previous block 209f433dc56SDmitri Vorobiev * "last block of the last file" even if there is no 210f433dc56SDmitri Vorobiev * real file there, saves us 1 gap. 211f433dc56SDmitri Vorobiev */ 212f433dc56SDmitri Vorobiev if (info->si_lf_eblk == bi->i_eblock) { 213f433dc56SDmitri Vorobiev info->si_lf_eblk = bi->i_sblock - 1; 2141da177e4SLinus Torvalds mark_buffer_dirty(info->si_sbh); 2151da177e4SLinus Torvalds } 2163f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2171da177e4SLinus Torvalds clear_inode(inode); 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 220561e47ceSChristoph Hellwig static int bfs_sync_fs(struct super_block *sb, int wait) 221561e47ceSChristoph Hellwig { 222561e47ceSChristoph Hellwig struct bfs_sb_info *info = BFS_SB(sb); 223561e47ceSChristoph Hellwig 224561e47ceSChristoph Hellwig mutex_lock(&info->bfs_lock); 225561e47ceSChristoph Hellwig mark_buffer_dirty(info->si_sbh); 226561e47ceSChristoph Hellwig sb->s_dirt = 0; 227561e47ceSChristoph Hellwig mutex_unlock(&info->bfs_lock); 228561e47ceSChristoph Hellwig 229561e47ceSChristoph Hellwig return 0; 230561e47ceSChristoph Hellwig } 231561e47ceSChristoph Hellwig 232561e47ceSChristoph Hellwig static void bfs_write_super(struct super_block *sb) 233561e47ceSChristoph Hellwig { 234561e47ceSChristoph Hellwig if (!(sb->s_flags & MS_RDONLY)) 235561e47ceSChristoph Hellwig bfs_sync_fs(sb, 1); 236561e47ceSChristoph Hellwig else 237561e47ceSChristoph Hellwig sb->s_dirt = 0; 238561e47ceSChristoph Hellwig } 239561e47ceSChristoph Hellwig 2401da177e4SLinus Torvalds static void bfs_put_super(struct super_block *s) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2433f165e4cSDmitri Vorobiev 244e1f89ec9SEric Sesterhenn if (!info) 245e1f89ec9SEric Sesterhenn return; 246e1f89ec9SEric Sesterhenn 2476cfd0148SChristoph Hellwig lock_kernel(); 2486cfd0148SChristoph Hellwig 2498c85e125SChristoph Hellwig if (s->s_dirt) 2508c85e125SChristoph Hellwig bfs_write_super(s); 2518c85e125SChristoph Hellwig 2521da177e4SLinus Torvalds brelse(info->si_sbh); 2533f165e4cSDmitri Vorobiev mutex_destroy(&info->bfs_lock); 2541da177e4SLinus Torvalds kfree(info->si_imap); 2551da177e4SLinus Torvalds kfree(info); 2561da177e4SLinus Torvalds s->s_fs_info = NULL; 2576cfd0148SChristoph Hellwig 2586cfd0148SChristoph Hellwig unlock_kernel(); 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 261726c3342SDavid Howells static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2621da177e4SLinus Torvalds { 263726c3342SDavid Howells struct super_block *s = dentry->d_sb; 2641da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2651da177e4SLinus Torvalds u64 id = huge_encode_dev(s->s_bdev->bd_dev); 2661da177e4SLinus Torvalds buf->f_type = BFS_MAGIC; 2671da177e4SLinus Torvalds buf->f_bsize = s->s_blocksize; 2681da177e4SLinus Torvalds buf->f_blocks = info->si_blocks; 2691da177e4SLinus Torvalds buf->f_bfree = buf->f_bavail = info->si_freeb; 2701da177e4SLinus Torvalds buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 2711da177e4SLinus Torvalds buf->f_ffree = info->si_freei; 2721da177e4SLinus Torvalds buf->f_fsid.val[0] = (u32)id; 2731da177e4SLinus Torvalds buf->f_fsid.val[1] = (u32)(id >> 32); 2741da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN; 2751da177e4SLinus Torvalds return 0; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 278e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb) 2811da177e4SLinus Torvalds { 2821da177e4SLinus Torvalds struct bfs_inode_info *bi; 283e94b1766SChristoph Lameter bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 2841da177e4SLinus Torvalds if (!bi) 2851da177e4SLinus Torvalds return NULL; 2861da177e4SLinus Torvalds return &bi->vfs_inode; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds static void bfs_destroy_inode(struct inode *inode) 2901da177e4SLinus Torvalds { 2911da177e4SLinus Torvalds kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 29451cc5068SAlexey Dobriyan static void init_once(void *foo) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds static int init_inodecache(void) 3021da177e4SLinus Torvalds { 3031da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 3041da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 305fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 306fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 30720c2df83SPaul Mundt init_once); 3081da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 3091da177e4SLinus Torvalds return -ENOMEM; 3101da177e4SLinus Torvalds return 0; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds static void destroy_inodecache(void) 3141da177e4SLinus Torvalds { 3151a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 318ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 3191da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 3201da177e4SLinus Torvalds .destroy_inode = bfs_destroy_inode, 3211da177e4SLinus Torvalds .write_inode = bfs_write_inode, 3221da177e4SLinus Torvalds .delete_inode = bfs_delete_inode, 3231da177e4SLinus Torvalds .put_super = bfs_put_super, 3241da177e4SLinus Torvalds .write_super = bfs_write_super, 325561e47ceSChristoph Hellwig .sync_fs = bfs_sync_fs, 3261da177e4SLinus Torvalds .statfs = bfs_statfs, 3271da177e4SLinus Torvalds }; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s) 3301da177e4SLinus Torvalds { 331fac92becSAndrew Stribblehill #ifdef DEBUG 3321da177e4SLinus Torvalds int i; 3331da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds if (!tmpbuf) 3361da177e4SLinus Torvalds return; 3371da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 3381da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 3391da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3401da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3411da177e4SLinus Torvalds else 3421da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3431da177e4SLinus Torvalds } 344f433dc56SDmitri Vorobiev printf("BFS-fs: %s: lasti=%08lx <%s>\n", 345f433dc56SDmitri Vorobiev prefix, BFS_SB(s)->si_lasti, tmpbuf); 3461da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3471da177e4SLinus Torvalds #endif 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3511da177e4SLinus Torvalds { 3521da177e4SLinus Torvalds struct buffer_head *bh; 3531da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3541da177e4SLinus Torvalds struct inode *inode; 355fac92becSAndrew Stribblehill unsigned i, imap_len; 3561da177e4SLinus Torvalds struct bfs_sb_info *info; 3575998649fSAl Viro int ret = -EINVAL; 358e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3591da177e4SLinus Torvalds 360f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 3611da177e4SLinus Torvalds if (!info) 3621da177e4SLinus Torvalds return -ENOMEM; 3635998649fSAl Viro mutex_init(&info->bfs_lock); 3641da177e4SLinus Torvalds s->s_fs_info = info; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3671da177e4SLinus Torvalds 3685998649fSAl Viro info->si_sbh = sb_bread(s, 0); 3695998649fSAl Viro if (!info->si_sbh) 3701da177e4SLinus Torvalds goto out; 3715998649fSAl Viro bfs_sb = (struct bfs_super_block *)info->si_sbh->b_data; 372fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3731da177e4SLinus Torvalds if (!silent) 3741da177e4SLinus Torvalds printf("No BFS filesystem on %s (magic=%08x)\n", 375fac92becSAndrew Stribblehill s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3765998649fSAl Viro goto out1; 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3791da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 382e1f89ec9SEric Sesterhenn 383e1f89ec9SEric Sesterhenn if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { 384e1f89ec9SEric Sesterhenn printf("Superblock is corrupted\n"); 3855998649fSAl Viro goto out1; 386e1f89ec9SEric Sesterhenn } 387e1f89ec9SEric Sesterhenn 388f433dc56SDmitri Vorobiev info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 389f433dc56SDmitri Vorobiev sizeof(struct bfs_inode) 3901da177e4SLinus Torvalds + BFS_ROOT_INO - 1; 391f433dc56SDmitri Vorobiev imap_len = (info->si_lasti / 8) + 1; 392f8314dc6SPanagiotis Issaris info->si_imap = kzalloc(imap_len, GFP_KERNEL); 3931da177e4SLinus Torvalds if (!info->si_imap) 3945998649fSAl Viro goto out1; 3951da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3961da177e4SLinus Torvalds set_bit(i, info->si_imap); 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds s->s_op = &bfs_sops; 399e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 400e33ab086SDavid Howells if (IS_ERR(inode)) { 401e33ab086SDavid Howells ret = PTR_ERR(inode); 4025998649fSAl Viro goto out2; 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds s->s_root = d_alloc_root(inode); 4051da177e4SLinus Torvalds if (!s->s_root) { 4061da177e4SLinus Torvalds iput(inode); 407e33ab086SDavid Howells ret = -ENOMEM; 4085998649fSAl Viro goto out2; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds 411f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 412f433dc56SDmitri Vorobiev info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 413f433dc56SDmitri Vorobiev - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 4141da177e4SLinus Torvalds info->si_freei = 0; 4151da177e4SLinus Torvalds info->si_lf_eblk = 0; 41650682bb4SEric Sesterhenn 41750682bb4SEric Sesterhenn /* can we read the last block? */ 41850682bb4SEric Sesterhenn bh = sb_bread(s, info->si_blocks - 1); 41950682bb4SEric Sesterhenn if (!bh) { 42050682bb4SEric Sesterhenn printf("Last block not available: %lu\n", info->si_blocks - 1); 42150682bb4SEric Sesterhenn ret = -EIO; 4225998649fSAl Viro goto out3; 42350682bb4SEric Sesterhenn } 42450682bb4SEric Sesterhenn brelse(bh); 42550682bb4SEric Sesterhenn 426c2b513dfSAl Viro bh = NULL; 4271da177e4SLinus Torvalds for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 428c2b513dfSAl Viro struct bfs_inode *di; 429c2b513dfSAl Viro int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 430c2b513dfSAl Viro int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 43175b25b4cSDmitri Vorobiev unsigned long eblock; 432c2b513dfSAl Viro 433c2b513dfSAl Viro if (!off) { 434c2b513dfSAl Viro brelse(bh); 435c2b513dfSAl Viro bh = sb_bread(s, block); 436c2b513dfSAl Viro } 437c2b513dfSAl Viro 438c2b513dfSAl Viro if (!bh) 439c2b513dfSAl Viro continue; 440c2b513dfSAl Viro 441c2b513dfSAl Viro di = (struct bfs_inode *)bh->b_data + off; 442c2b513dfSAl Viro 443e1f89ec9SEric Sesterhenn /* test if filesystem is not corrupted */ 444e1f89ec9SEric Sesterhenn 445e1f89ec9SEric Sesterhenn i_eoff = le32_to_cpu(di->i_eoffset); 446e1f89ec9SEric Sesterhenn i_sblock = le32_to_cpu(di->i_sblock); 447e1f89ec9SEric Sesterhenn i_eblock = le32_to_cpu(di->i_eblock); 448e1f89ec9SEric Sesterhenn s_size = le32_to_cpu(bfs_sb->s_end); 449e1f89ec9SEric Sesterhenn 450e1f89ec9SEric Sesterhenn if (i_sblock > info->si_blocks || 451e1f89ec9SEric Sesterhenn i_eblock > info->si_blocks || 452e1f89ec9SEric Sesterhenn i_sblock > i_eblock || 453e1f89ec9SEric Sesterhenn i_eoff > s_size || 454e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 455e1f89ec9SEric Sesterhenn 456e1f89ec9SEric Sesterhenn printf("Inode 0x%08x corrupted\n", i); 457e1f89ec9SEric Sesterhenn 458e1f89ec9SEric Sesterhenn brelse(bh); 4595998649fSAl Viro ret = -EIO; 4605998649fSAl Viro goto out3; 461e1f89ec9SEric Sesterhenn } 462e1f89ec9SEric Sesterhenn 463c2b513dfSAl Viro if (!di->i_ino) { 4641da177e4SLinus Torvalds info->si_freei++; 465c2b513dfSAl Viro continue; 466c2b513dfSAl Viro } 4671da177e4SLinus Torvalds set_bit(i, info->si_imap); 468c2b513dfSAl Viro info->si_freeb -= BFS_FILEBLOCKS(di); 469c2b513dfSAl Viro 470c2b513dfSAl Viro eblock = le32_to_cpu(di->i_eblock); 471f433dc56SDmitri Vorobiev if (eblock > info->si_lf_eblk) 472c2b513dfSAl Viro info->si_lf_eblk = eblock; 4731da177e4SLinus Torvalds } 474c2b513dfSAl Viro brelse(bh); 4751da177e4SLinus Torvalds if (!(s->s_flags & MS_RDONLY)) { 476c2b513dfSAl Viro mark_buffer_dirty(info->si_sbh); 4771da177e4SLinus Torvalds s->s_dirt = 1; 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds dump_imap("read_super", s); 4801da177e4SLinus Torvalds return 0; 4811da177e4SLinus Torvalds 4825998649fSAl Viro out3: 4835998649fSAl Viro dput(s->s_root); 4845998649fSAl Viro s->s_root = NULL; 4855998649fSAl Viro out2: 4865998649fSAl Viro kfree(info->si_imap); 4875998649fSAl Viro out1: 4885998649fSAl Viro brelse(info->si_sbh); 4891da177e4SLinus Torvalds out: 4905998649fSAl Viro mutex_destroy(&info->bfs_lock); 4911da177e4SLinus Torvalds kfree(info); 4921da177e4SLinus Torvalds s->s_fs_info = NULL; 493e33ab086SDavid Howells return ret; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds 496454e2398SDavid Howells static int bfs_get_sb(struct file_system_type *fs_type, 497454e2398SDavid Howells int flags, const char *dev_name, void *data, struct vfsmount *mnt) 4981da177e4SLinus Torvalds { 499454e2398SDavid Howells return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 5031da177e4SLinus Torvalds .owner = THIS_MODULE, 5041da177e4SLinus Torvalds .name = "bfs", 5051da177e4SLinus Torvalds .get_sb = bfs_get_sb, 5061da177e4SLinus Torvalds .kill_sb = kill_block_super, 5071da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 5081da177e4SLinus Torvalds }; 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds static int __init init_bfs_fs(void) 5111da177e4SLinus Torvalds { 5121da177e4SLinus Torvalds int err = init_inodecache(); 5131da177e4SLinus Torvalds if (err) 5141da177e4SLinus Torvalds goto out1; 5151da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 5161da177e4SLinus Torvalds if (err) 5171da177e4SLinus Torvalds goto out; 5181da177e4SLinus Torvalds return 0; 5191da177e4SLinus Torvalds out: 5201da177e4SLinus Torvalds destroy_inodecache(); 5211da177e4SLinus Torvalds out1: 5221da177e4SLinus Torvalds return err; 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 5261da177e4SLinus Torvalds { 5271da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 5281da177e4SLinus Torvalds destroy_inodecache(); 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds module_init(init_bfs_fs) 5321da177e4SLinus Torvalds module_exit(exit_bfs_fs) 533