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> 181da177e4SLinus Torvalds #include <asm/uaccess.h> 191da177e4SLinus Torvalds #include "bfs.h" 201da177e4SLinus Torvalds 2169688262STigran Aivazian MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); 221da177e4SLinus Torvalds MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); 231da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #undef DEBUG 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #ifdef DEBUG 281da177e4SLinus Torvalds #define dprintf(x...) printf(x) 291da177e4SLinus Torvalds #else 301da177e4SLinus Torvalds #define dprintf(x...) 311da177e4SLinus Torvalds #endif 321da177e4SLinus Torvalds 338c85e125SChristoph Hellwig static void bfs_write_super(struct super_block *s); 341da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s); 351da177e4SLinus Torvalds 36e33ab086SDavid Howells struct inode *bfs_iget(struct super_block *sb, unsigned long ino) 371da177e4SLinus Torvalds { 381da177e4SLinus Torvalds struct bfs_inode *di; 39e33ab086SDavid Howells struct inode *inode; 401da177e4SLinus Torvalds struct buffer_head *bh; 411da177e4SLinus Torvalds int block, off; 421da177e4SLinus Torvalds 43e33ab086SDavid Howells inode = iget_locked(sb, ino); 44e33ab086SDavid Howells if (IS_ERR(inode)) 45e33ab086SDavid Howells return ERR_PTR(-ENOMEM); 46e33ab086SDavid Howells if (!(inode->i_state & I_NEW)) 47e33ab086SDavid Howells return inode; 48e33ab086SDavid Howells 49f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 501da177e4SLinus Torvalds printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); 51e33ab086SDavid Howells goto error; 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 551da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 561da177e4SLinus Torvalds if (!bh) { 57f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, 58f433dc56SDmitri Vorobiev ino); 59e33ab086SDavid Howells goto error; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 631da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 641da177e4SLinus Torvalds 65fac92becSAndrew Stribblehill inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 66fac92becSAndrew Stribblehill if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 671da177e4SLinus Torvalds inode->i_mode |= S_IFDIR; 681da177e4SLinus Torvalds inode->i_op = &bfs_dir_inops; 691da177e4SLinus Torvalds inode->i_fop = &bfs_dir_operations; 70fac92becSAndrew Stribblehill } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 711da177e4SLinus Torvalds inode->i_mode |= S_IFREG; 721da177e4SLinus Torvalds inode->i_op = &bfs_file_inops; 731da177e4SLinus Torvalds inode->i_fop = &bfs_file_operations; 741da177e4SLinus Torvalds inode->i_mapping->a_ops = &bfs_aops; 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds 77fac92becSAndrew Stribblehill BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 78fac92becSAndrew Stribblehill BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 79f433dc56SDmitri Vorobiev BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); 80fac92becSAndrew Stribblehill inode->i_uid = le32_to_cpu(di->i_uid); 81fac92becSAndrew Stribblehill inode->i_gid = le32_to_cpu(di->i_gid); 82fac92becSAndrew Stribblehill inode->i_nlink = le32_to_cpu(di->i_nlink); 831da177e4SLinus Torvalds inode->i_size = BFS_FILESIZE(di); 841da177e4SLinus Torvalds inode->i_blocks = BFS_FILEBLOCKS(di); 85fac92becSAndrew Stribblehill inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 86fac92becSAndrew Stribblehill inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 87fac92becSAndrew Stribblehill inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 881da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0; 891da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; 901da177e4SLinus Torvalds inode->i_ctime.tv_nsec = 0; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds brelse(bh); 93e33ab086SDavid Howells unlock_new_inode(inode); 94e33ab086SDavid Howells return inode; 95e33ab086SDavid Howells 96e33ab086SDavid Howells error: 97e33ab086SDavid Howells iget_failed(inode); 98e33ab086SDavid Howells return ERR_PTR(-EIO); 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds 1014427f0c3SAl Viro static int bfs_write_inode(struct inode *inode, int wait) 1021da177e4SLinus Torvalds { 1034427f0c3SAl Viro struct bfs_sb_info *info = BFS_SB(inode->i_sb); 104fac92becSAndrew Stribblehill unsigned int ino = (u16)inode->i_ino; 105fac92becSAndrew Stribblehill unsigned long i_sblock; 1061da177e4SLinus Torvalds struct bfs_inode *di; 1071da177e4SLinus Torvalds struct buffer_head *bh; 1081da177e4SLinus Torvalds int block, off; 1094427f0c3SAl Viro int err = 0; 1101da177e4SLinus Torvalds 111fac92becSAndrew Stribblehill dprintf("ino=%08x\n", ino); 112fac92becSAndrew Stribblehill 113f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 114fac92becSAndrew Stribblehill printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); 1151da177e4SLinus Torvalds return -EIO; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1183f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1191da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 1201da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 1211da177e4SLinus Torvalds if (!bh) { 122f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08x\n", 123f433dc56SDmitri Vorobiev inode->i_sb->s_id, ino); 1243f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1251da177e4SLinus Torvalds return -EIO; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 1291da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 1301da177e4SLinus Torvalds 131fac92becSAndrew Stribblehill if (ino == BFS_ROOT_INO) 132fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VDIR); 1331da177e4SLinus Torvalds else 134fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VREG); 1351da177e4SLinus Torvalds 136fac92becSAndrew Stribblehill di->i_ino = cpu_to_le16(ino); 137fac92becSAndrew Stribblehill di->i_mode = cpu_to_le32(inode->i_mode); 138fac92becSAndrew Stribblehill di->i_uid = cpu_to_le32(inode->i_uid); 139fac92becSAndrew Stribblehill di->i_gid = cpu_to_le32(inode->i_gid); 140fac92becSAndrew Stribblehill di->i_nlink = cpu_to_le32(inode->i_nlink); 141fac92becSAndrew Stribblehill di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 142fac92becSAndrew Stribblehill di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 143fac92becSAndrew Stribblehill di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 144fac92becSAndrew Stribblehill i_sblock = BFS_I(inode)->i_sblock; 145fac92becSAndrew Stribblehill di->i_sblock = cpu_to_le32(i_sblock); 146fac92becSAndrew Stribblehill di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 147fac92becSAndrew Stribblehill di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds mark_buffer_dirty(bh); 1504427f0c3SAl Viro if (wait) { 1514427f0c3SAl Viro sync_dirty_buffer(bh); 1524427f0c3SAl Viro if (buffer_req(bh) && !buffer_uptodate(bh)) 1534427f0c3SAl Viro err = -EIO; 1544427f0c3SAl Viro } 1551da177e4SLinus Torvalds brelse(bh); 1563f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1574427f0c3SAl Viro return err; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds static void bfs_delete_inode(struct inode *inode) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds unsigned long ino = inode->i_ino; 1631da177e4SLinus Torvalds struct bfs_inode *di; 1641da177e4SLinus Torvalds struct buffer_head *bh; 1651da177e4SLinus Torvalds int block, off; 1661da177e4SLinus Torvalds struct super_block *s = inode->i_sb; 1671da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 168fac92becSAndrew Stribblehill struct bfs_inode_info *bi = BFS_I(inode); 1691da177e4SLinus Torvalds 170fac92becSAndrew Stribblehill dprintf("ino=%08lx\n", ino); 1711da177e4SLinus Torvalds 172fef26658SMark Fasheh truncate_inode_pages(&inode->i_data, 0); 173fef26658SMark Fasheh 174f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) { 175fac92becSAndrew Stribblehill printf("invalid ino=%08lx\n", ino); 1761da177e4SLinus Torvalds return; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds inode->i_size = 0; 1801da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; 1813f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1821da177e4SLinus Torvalds mark_inode_dirty(inode); 183f433dc56SDmitri Vorobiev 1841da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 1851da177e4SLinus Torvalds bh = sb_bread(s, block); 1861da177e4SLinus Torvalds if (!bh) { 187f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", 188f433dc56SDmitri Vorobiev inode->i_sb->s_id, ino); 1893f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1901da177e4SLinus Torvalds return; 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 1931da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 194f433dc56SDmitri Vorobiev memset((void *)di, 0, sizeof(struct bfs_inode)); 195f433dc56SDmitri Vorobiev mark_buffer_dirty(bh); 196f433dc56SDmitri Vorobiev brelse(bh); 197f433dc56SDmitri Vorobiev 198fac92becSAndrew Stribblehill if (bi->i_dsk_ino) { 1997e46aa5cSAl Viro if (bi->i_sblock) 2007e46aa5cSAl Viro info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 2011da177e4SLinus Torvalds info->si_freei++; 202fac92becSAndrew Stribblehill clear_bit(ino, info->si_imap); 2031da177e4SLinus Torvalds dump_imap("delete_inode", s); 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 206f433dc56SDmitri Vorobiev /* 207f433dc56SDmitri Vorobiev * If this was the last file, make the previous block 208f433dc56SDmitri Vorobiev * "last block of the last file" even if there is no 209f433dc56SDmitri Vorobiev * real file there, saves us 1 gap. 210f433dc56SDmitri Vorobiev */ 211f433dc56SDmitri Vorobiev if (info->si_lf_eblk == bi->i_eblock) { 212f433dc56SDmitri Vorobiev info->si_lf_eblk = bi->i_sblock - 1; 2131da177e4SLinus Torvalds mark_buffer_dirty(info->si_sbh); 2141da177e4SLinus Torvalds } 2153f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2161da177e4SLinus Torvalds clear_inode(inode); 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds static void bfs_put_super(struct super_block *s) 2201da177e4SLinus Torvalds { 2211da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2223f165e4cSDmitri Vorobiev 223e1f89ec9SEric Sesterhenn if (!info) 224e1f89ec9SEric Sesterhenn return; 225e1f89ec9SEric Sesterhenn 2266cfd0148SChristoph Hellwig lock_kernel(); 2276cfd0148SChristoph Hellwig 2288c85e125SChristoph Hellwig if (s->s_dirt) 2298c85e125SChristoph Hellwig bfs_write_super(s); 2308c85e125SChristoph Hellwig 2311da177e4SLinus Torvalds brelse(info->si_sbh); 2323f165e4cSDmitri Vorobiev mutex_destroy(&info->bfs_lock); 2331da177e4SLinus Torvalds kfree(info->si_imap); 2341da177e4SLinus Torvalds kfree(info); 2351da177e4SLinus Torvalds s->s_fs_info = NULL; 2366cfd0148SChristoph Hellwig 2376cfd0148SChristoph Hellwig unlock_kernel(); 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 240726c3342SDavid Howells static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2411da177e4SLinus Torvalds { 242726c3342SDavid Howells struct super_block *s = dentry->d_sb; 2431da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2441da177e4SLinus Torvalds u64 id = huge_encode_dev(s->s_bdev->bd_dev); 2451da177e4SLinus Torvalds buf->f_type = BFS_MAGIC; 2461da177e4SLinus Torvalds buf->f_bsize = s->s_blocksize; 2471da177e4SLinus Torvalds buf->f_blocks = info->si_blocks; 2481da177e4SLinus Torvalds buf->f_bfree = buf->f_bavail = info->si_freeb; 2491da177e4SLinus Torvalds buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 2501da177e4SLinus Torvalds buf->f_ffree = info->si_freei; 2511da177e4SLinus Torvalds buf->f_fsid.val[0] = (u32)id; 2521da177e4SLinus Torvalds buf->f_fsid.val[1] = (u32)(id >> 32); 2531da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN; 2541da177e4SLinus Torvalds return 0; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds static void bfs_write_super(struct super_block *s) 2581da177e4SLinus Torvalds { 2593f165e4cSDmitri Vorobiev struct bfs_sb_info *info = BFS_SB(s); 2603f165e4cSDmitri Vorobiev 2613f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 2621da177e4SLinus Torvalds if (!(s->s_flags & MS_RDONLY)) 2633f165e4cSDmitri Vorobiev mark_buffer_dirty(info->si_sbh); 2641da177e4SLinus Torvalds s->s_dirt = 0; 2653f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 268e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb) 2711da177e4SLinus Torvalds { 2721da177e4SLinus Torvalds struct bfs_inode_info *bi; 273e94b1766SChristoph Lameter bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 2741da177e4SLinus Torvalds if (!bi) 2751da177e4SLinus Torvalds return NULL; 2761da177e4SLinus Torvalds return &bi->vfs_inode; 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds static void bfs_destroy_inode(struct inode *inode) 2801da177e4SLinus Torvalds { 2811da177e4SLinus Torvalds kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 28451cc5068SAlexey Dobriyan static void init_once(void *foo) 2851da177e4SLinus Torvalds { 2861da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds static int init_inodecache(void) 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 2941da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 295fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 296fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 29720c2df83SPaul Mundt init_once); 2981da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 2991da177e4SLinus Torvalds return -ENOMEM; 3001da177e4SLinus Torvalds return 0; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds static void destroy_inodecache(void) 3041da177e4SLinus Torvalds { 3051a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 308ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 3091da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 3101da177e4SLinus Torvalds .destroy_inode = bfs_destroy_inode, 3111da177e4SLinus Torvalds .write_inode = bfs_write_inode, 3121da177e4SLinus Torvalds .delete_inode = bfs_delete_inode, 3131da177e4SLinus Torvalds .put_super = bfs_put_super, 3141da177e4SLinus Torvalds .write_super = bfs_write_super, 3151da177e4SLinus Torvalds .statfs = bfs_statfs, 3161da177e4SLinus Torvalds }; 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s) 3191da177e4SLinus Torvalds { 320fac92becSAndrew Stribblehill #ifdef DEBUG 3211da177e4SLinus Torvalds int i; 3221da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds if (!tmpbuf) 3251da177e4SLinus Torvalds return; 3261da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 3271da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 3281da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3291da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3301da177e4SLinus Torvalds else 3311da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3321da177e4SLinus Torvalds } 333f433dc56SDmitri Vorobiev printf("BFS-fs: %s: lasti=%08lx <%s>\n", 334f433dc56SDmitri Vorobiev prefix, BFS_SB(s)->si_lasti, tmpbuf); 3351da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3361da177e4SLinus Torvalds #endif 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3401da177e4SLinus Torvalds { 3411da177e4SLinus Torvalds struct buffer_head *bh; 3421da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3431da177e4SLinus Torvalds struct inode *inode; 344fac92becSAndrew Stribblehill unsigned i, imap_len; 3451da177e4SLinus Torvalds struct bfs_sb_info *info; 346e33ab086SDavid Howells long ret = -EINVAL; 347e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3481da177e4SLinus Torvalds 349f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 3501da177e4SLinus Torvalds if (!info) 3511da177e4SLinus Torvalds return -ENOMEM; 3521da177e4SLinus Torvalds s->s_fs_info = info; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds bh = sb_bread(s, 0); 3571da177e4SLinus Torvalds if(!bh) 3581da177e4SLinus Torvalds goto out; 3591da177e4SLinus Torvalds bfs_sb = (struct bfs_super_block *)bh->b_data; 360fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3611da177e4SLinus Torvalds if (!silent) 3621da177e4SLinus Torvalds printf("No BFS filesystem on %s (magic=%08x)\n", 363fac92becSAndrew Stribblehill s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3641da177e4SLinus Torvalds goto out; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3671da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 3701da177e4SLinus Torvalds info->si_sbh = bh; 371e1f89ec9SEric Sesterhenn 372e1f89ec9SEric Sesterhenn if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { 373e1f89ec9SEric Sesterhenn printf("Superblock is corrupted\n"); 374e1f89ec9SEric Sesterhenn goto out; 375e1f89ec9SEric Sesterhenn } 376e1f89ec9SEric Sesterhenn 377f433dc56SDmitri Vorobiev info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 378f433dc56SDmitri Vorobiev sizeof(struct bfs_inode) 3791da177e4SLinus Torvalds + BFS_ROOT_INO - 1; 380f433dc56SDmitri Vorobiev imap_len = (info->si_lasti / 8) + 1; 381f8314dc6SPanagiotis Issaris info->si_imap = kzalloc(imap_len, GFP_KERNEL); 3821da177e4SLinus Torvalds if (!info->si_imap) 3831da177e4SLinus Torvalds goto out; 3841da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3851da177e4SLinus Torvalds set_bit(i, info->si_imap); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds s->s_op = &bfs_sops; 388e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 389e33ab086SDavid Howells if (IS_ERR(inode)) { 390e33ab086SDavid Howells ret = PTR_ERR(inode); 3911da177e4SLinus Torvalds kfree(info->si_imap); 3921da177e4SLinus Torvalds goto out; 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds s->s_root = d_alloc_root(inode); 3951da177e4SLinus Torvalds if (!s->s_root) { 3961da177e4SLinus Torvalds iput(inode); 397e33ab086SDavid Howells ret = -ENOMEM; 3981da177e4SLinus Torvalds kfree(info->si_imap); 3991da177e4SLinus Torvalds goto out; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 402f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 403f433dc56SDmitri Vorobiev info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 404f433dc56SDmitri Vorobiev - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 4051da177e4SLinus Torvalds info->si_freei = 0; 4061da177e4SLinus Torvalds info->si_lf_eblk = 0; 40750682bb4SEric Sesterhenn 40850682bb4SEric Sesterhenn /* can we read the last block? */ 40950682bb4SEric Sesterhenn bh = sb_bread(s, info->si_blocks - 1); 41050682bb4SEric Sesterhenn if (!bh) { 41150682bb4SEric Sesterhenn printf("Last block not available: %lu\n", info->si_blocks - 1); 41250682bb4SEric Sesterhenn iput(inode); 41350682bb4SEric Sesterhenn ret = -EIO; 41450682bb4SEric Sesterhenn kfree(info->si_imap); 41550682bb4SEric Sesterhenn goto out; 41650682bb4SEric Sesterhenn } 41750682bb4SEric Sesterhenn brelse(bh); 41850682bb4SEric Sesterhenn 419c2b513dfSAl Viro bh = NULL; 4201da177e4SLinus Torvalds for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 421c2b513dfSAl Viro struct bfs_inode *di; 422c2b513dfSAl Viro int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 423c2b513dfSAl Viro int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 42475b25b4cSDmitri Vorobiev unsigned long eblock; 425c2b513dfSAl Viro 426c2b513dfSAl Viro if (!off) { 427c2b513dfSAl Viro brelse(bh); 428c2b513dfSAl Viro bh = sb_bread(s, block); 429c2b513dfSAl Viro } 430c2b513dfSAl Viro 431c2b513dfSAl Viro if (!bh) 432c2b513dfSAl Viro continue; 433c2b513dfSAl Viro 434c2b513dfSAl Viro di = (struct bfs_inode *)bh->b_data + off; 435c2b513dfSAl Viro 436e1f89ec9SEric Sesterhenn /* test if filesystem is not corrupted */ 437e1f89ec9SEric Sesterhenn 438e1f89ec9SEric Sesterhenn i_eoff = le32_to_cpu(di->i_eoffset); 439e1f89ec9SEric Sesterhenn i_sblock = le32_to_cpu(di->i_sblock); 440e1f89ec9SEric Sesterhenn i_eblock = le32_to_cpu(di->i_eblock); 441e1f89ec9SEric Sesterhenn s_size = le32_to_cpu(bfs_sb->s_end); 442e1f89ec9SEric Sesterhenn 443e1f89ec9SEric Sesterhenn if (i_sblock > info->si_blocks || 444e1f89ec9SEric Sesterhenn i_eblock > info->si_blocks || 445e1f89ec9SEric Sesterhenn i_sblock > i_eblock || 446e1f89ec9SEric Sesterhenn i_eoff > s_size || 447e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 448e1f89ec9SEric Sesterhenn 449e1f89ec9SEric Sesterhenn printf("Inode 0x%08x corrupted\n", i); 450e1f89ec9SEric Sesterhenn 451e1f89ec9SEric Sesterhenn brelse(bh); 452e1f89ec9SEric Sesterhenn s->s_root = NULL; 453e1f89ec9SEric Sesterhenn kfree(info->si_imap); 454e1f89ec9SEric Sesterhenn kfree(info); 455e1f89ec9SEric Sesterhenn s->s_fs_info = NULL; 456e1f89ec9SEric Sesterhenn return -EIO; 457e1f89ec9SEric Sesterhenn } 458e1f89ec9SEric Sesterhenn 459c2b513dfSAl Viro if (!di->i_ino) { 4601da177e4SLinus Torvalds info->si_freei++; 461c2b513dfSAl Viro continue; 462c2b513dfSAl Viro } 4631da177e4SLinus Torvalds set_bit(i, info->si_imap); 464c2b513dfSAl Viro info->si_freeb -= BFS_FILEBLOCKS(di); 465c2b513dfSAl Viro 466c2b513dfSAl Viro eblock = le32_to_cpu(di->i_eblock); 467f433dc56SDmitri Vorobiev if (eblock > info->si_lf_eblk) 468c2b513dfSAl Viro info->si_lf_eblk = eblock; 4691da177e4SLinus Torvalds } 470c2b513dfSAl Viro brelse(bh); 4711da177e4SLinus Torvalds if (!(s->s_flags & MS_RDONLY)) { 472c2b513dfSAl Viro mark_buffer_dirty(info->si_sbh); 4731da177e4SLinus Torvalds s->s_dirt = 1; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds dump_imap("read_super", s); 4763f165e4cSDmitri Vorobiev mutex_init(&info->bfs_lock); 4771da177e4SLinus Torvalds return 0; 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds out: 4801da177e4SLinus Torvalds brelse(bh); 4811da177e4SLinus Torvalds kfree(info); 4821da177e4SLinus Torvalds s->s_fs_info = NULL; 483e33ab086SDavid Howells return ret; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 486454e2398SDavid Howells static int bfs_get_sb(struct file_system_type *fs_type, 487454e2398SDavid Howells int flags, const char *dev_name, void *data, struct vfsmount *mnt) 4881da177e4SLinus Torvalds { 489454e2398SDavid Howells return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 4931da177e4SLinus Torvalds .owner = THIS_MODULE, 4941da177e4SLinus Torvalds .name = "bfs", 4951da177e4SLinus Torvalds .get_sb = bfs_get_sb, 4961da177e4SLinus Torvalds .kill_sb = kill_block_super, 4971da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4981da177e4SLinus Torvalds }; 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds static int __init init_bfs_fs(void) 5011da177e4SLinus Torvalds { 5021da177e4SLinus Torvalds int err = init_inodecache(); 5031da177e4SLinus Torvalds if (err) 5041da177e4SLinus Torvalds goto out1; 5051da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 5061da177e4SLinus Torvalds if (err) 5071da177e4SLinus Torvalds goto out; 5081da177e4SLinus Torvalds return 0; 5091da177e4SLinus Torvalds out: 5101da177e4SLinus Torvalds destroy_inodecache(); 5111da177e4SLinus Torvalds out1: 5121da177e4SLinus Torvalds return err; 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 5161da177e4SLinus Torvalds { 5171da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 5181da177e4SLinus Torvalds destroy_inodecache(); 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds module_init(init_bfs_fs) 5221da177e4SLinus Torvalds module_exit(exit_bfs_fs) 523