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/buffer_head.h> 161da177e4SLinus Torvalds #include <linux/vfs.h> 17a9185b41SChristoph Hellwig #include <linux/writeback.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 331da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s); 341da177e4SLinus Torvalds 35e33ab086SDavid Howells struct inode *bfs_iget(struct super_block *sb, unsigned long ino) 361da177e4SLinus Torvalds { 371da177e4SLinus Torvalds struct bfs_inode *di; 38e33ab086SDavid Howells struct inode *inode; 391da177e4SLinus Torvalds struct buffer_head *bh; 401da177e4SLinus Torvalds int block, off; 411da177e4SLinus Torvalds 42e33ab086SDavid Howells inode = iget_locked(sb, ino); 43821ff77cSDan Carpenter if (!inode) 44e33ab086SDavid Howells return ERR_PTR(-ENOMEM); 45e33ab086SDavid Howells if (!(inode->i_state & I_NEW)) 46e33ab086SDavid Howells return inode; 47e33ab086SDavid Howells 48f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 491da177e4SLinus Torvalds printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); 50e33ab086SDavid Howells goto error; 511da177e4SLinus Torvalds } 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 541da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 551da177e4SLinus Torvalds if (!bh) { 56f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, 57f433dc56SDmitri Vorobiev ino); 58e33ab086SDavid Howells goto error; 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 621da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 631da177e4SLinus Torvalds 64fac92becSAndrew Stribblehill inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 65fac92becSAndrew Stribblehill if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 661da177e4SLinus Torvalds inode->i_mode |= S_IFDIR; 671da177e4SLinus Torvalds inode->i_op = &bfs_dir_inops; 681da177e4SLinus Torvalds inode->i_fop = &bfs_dir_operations; 69fac92becSAndrew Stribblehill } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 701da177e4SLinus Torvalds inode->i_mode |= S_IFREG; 711da177e4SLinus Torvalds inode->i_op = &bfs_file_inops; 721da177e4SLinus Torvalds inode->i_fop = &bfs_file_operations; 731da177e4SLinus Torvalds inode->i_mapping->a_ops = &bfs_aops; 741da177e4SLinus Torvalds } 751da177e4SLinus Torvalds 76fac92becSAndrew Stribblehill BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 77fac92becSAndrew Stribblehill BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 78f433dc56SDmitri Vorobiev BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); 797f5b82b8SEric W. Biederman i_uid_write(inode, le32_to_cpu(di->i_uid)); 807f5b82b8SEric W. Biederman i_gid_write(inode, le32_to_cpu(di->i_gid)); 81bfe86848SMiklos Szeredi set_nlink(inode, le32_to_cpu(di->i_nlink)); 821da177e4SLinus Torvalds inode->i_size = BFS_FILESIZE(di); 831da177e4SLinus Torvalds inode->i_blocks = BFS_FILEBLOCKS(di); 84fac92becSAndrew Stribblehill inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 85fac92becSAndrew Stribblehill inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 86fac92becSAndrew Stribblehill inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 871da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0; 881da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; 891da177e4SLinus Torvalds inode->i_ctime.tv_nsec = 0; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds brelse(bh); 92e33ab086SDavid Howells unlock_new_inode(inode); 93e33ab086SDavid Howells return inode; 94e33ab086SDavid Howells 95e33ab086SDavid Howells error: 96e33ab086SDavid Howells iget_failed(inode); 97e33ab086SDavid Howells return ERR_PTR(-EIO); 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds 1009df2f851SAl Viro static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p) 1019df2f851SAl Viro { 1029df2f851SAl Viro if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) { 1039df2f851SAl Viro printf("Bad inode number %s:%08x\n", sb->s_id, ino); 1049df2f851SAl Viro return ERR_PTR(-EIO); 1059df2f851SAl Viro } 1069df2f851SAl Viro 1079df2f851SAl Viro ino -= BFS_ROOT_INO; 1089df2f851SAl Viro 1099df2f851SAl Viro *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK); 1109df2f851SAl Viro if (!*p) { 1119df2f851SAl Viro printf("Unable to read inode %s:%08x\n", sb->s_id, ino); 1129df2f851SAl Viro return ERR_PTR(-EIO); 1139df2f851SAl Viro } 1149df2f851SAl Viro 1159df2f851SAl Viro return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK; 1169df2f851SAl Viro } 1179df2f851SAl Viro 118a9185b41SChristoph Hellwig static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) 1191da177e4SLinus Torvalds { 1204427f0c3SAl Viro struct bfs_sb_info *info = BFS_SB(inode->i_sb); 121fac92becSAndrew Stribblehill unsigned int ino = (u16)inode->i_ino; 122fac92becSAndrew Stribblehill unsigned long i_sblock; 1231da177e4SLinus Torvalds struct bfs_inode *di; 1241da177e4SLinus Torvalds struct buffer_head *bh; 1254427f0c3SAl Viro int err = 0; 1261da177e4SLinus Torvalds 127fac92becSAndrew Stribblehill dprintf("ino=%08x\n", ino); 128fac92becSAndrew Stribblehill 1299df2f851SAl Viro di = find_inode(inode->i_sb, ino, &bh); 1309df2f851SAl Viro if (IS_ERR(di)) 1319df2f851SAl Viro return PTR_ERR(di); 1321da177e4SLinus Torvalds 1333f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1341da177e4SLinus Torvalds 135fac92becSAndrew Stribblehill if (ino == BFS_ROOT_INO) 136fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VDIR); 1371da177e4SLinus Torvalds else 138fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VREG); 1391da177e4SLinus Torvalds 140fac92becSAndrew Stribblehill di->i_ino = cpu_to_le16(ino); 141fac92becSAndrew Stribblehill di->i_mode = cpu_to_le32(inode->i_mode); 1427f5b82b8SEric W. Biederman di->i_uid = cpu_to_le32(i_uid_read(inode)); 1437f5b82b8SEric W. Biederman di->i_gid = cpu_to_le32(i_gid_read(inode)); 144fac92becSAndrew Stribblehill di->i_nlink = cpu_to_le32(inode->i_nlink); 145fac92becSAndrew Stribblehill di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 146fac92becSAndrew Stribblehill di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 147fac92becSAndrew Stribblehill di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 148fac92becSAndrew Stribblehill i_sblock = BFS_I(inode)->i_sblock; 149fac92becSAndrew Stribblehill di->i_sblock = cpu_to_le32(i_sblock); 150fac92becSAndrew Stribblehill di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 151fac92becSAndrew Stribblehill di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds mark_buffer_dirty(bh); 154a9185b41SChristoph Hellwig if (wbc->sync_mode == WB_SYNC_ALL) { 1554427f0c3SAl Viro sync_dirty_buffer(bh); 1564427f0c3SAl Viro if (buffer_req(bh) && !buffer_uptodate(bh)) 1574427f0c3SAl Viro err = -EIO; 1584427f0c3SAl Viro } 1591da177e4SLinus Torvalds brelse(bh); 1603f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1614427f0c3SAl Viro return err; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1649df2f851SAl Viro static void bfs_evict_inode(struct inode *inode) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds unsigned long ino = inode->i_ino; 1671da177e4SLinus Torvalds struct bfs_inode *di; 1681da177e4SLinus Torvalds struct buffer_head *bh; 1691da177e4SLinus Torvalds struct super_block *s = inode->i_sb; 1701da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 171fac92becSAndrew Stribblehill struct bfs_inode_info *bi = BFS_I(inode); 1721da177e4SLinus Torvalds 173fac92becSAndrew Stribblehill dprintf("ino=%08lx\n", ino); 1741da177e4SLinus Torvalds 175fef26658SMark Fasheh truncate_inode_pages(&inode->i_data, 0); 1769df2f851SAl Viro invalidate_inode_buffers(inode); 177dbd5768fSJan Kara clear_inode(inode); 178fef26658SMark Fasheh 1799df2f851SAl Viro if (inode->i_nlink) 1801da177e4SLinus Torvalds return; 1811da177e4SLinus Torvalds 1829df2f851SAl Viro di = find_inode(s, inode->i_ino, &bh); 1839df2f851SAl Viro if (IS_ERR(di)) 1849df2f851SAl Viro return; 1859df2f851SAl Viro 1863f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1879df2f851SAl Viro /* clear on-disk inode */ 1889df2f851SAl Viro memset(di, 0, sizeof(struct bfs_inode)); 189f433dc56SDmitri Vorobiev mark_buffer_dirty(bh); 190f433dc56SDmitri Vorobiev brelse(bh); 191f433dc56SDmitri Vorobiev 192fac92becSAndrew Stribblehill if (bi->i_dsk_ino) { 1937e46aa5cSAl Viro if (bi->i_sblock) 1947e46aa5cSAl Viro info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 1951da177e4SLinus Torvalds info->si_freei++; 196fac92becSAndrew Stribblehill clear_bit(ino, info->si_imap); 1971da177e4SLinus Torvalds dump_imap("delete_inode", s); 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 200f433dc56SDmitri Vorobiev /* 201f433dc56SDmitri Vorobiev * If this was the last file, make the previous block 202f433dc56SDmitri Vorobiev * "last block of the last file" even if there is no 203f433dc56SDmitri Vorobiev * real file there, saves us 1 gap. 204f433dc56SDmitri Vorobiev */ 2054e29d50aSArtem Bityutskiy if (info->si_lf_eblk == bi->i_eblock) 206f433dc56SDmitri Vorobiev info->si_lf_eblk = bi->i_sblock - 1; 2073f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds static void bfs_put_super(struct super_block *s) 2111da177e4SLinus Torvalds { 2121da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2133f165e4cSDmitri Vorobiev 214e1f89ec9SEric Sesterhenn if (!info) 215e1f89ec9SEric Sesterhenn return; 216e1f89ec9SEric Sesterhenn 2173f165e4cSDmitri Vorobiev mutex_destroy(&info->bfs_lock); 2181da177e4SLinus Torvalds kfree(info->si_imap); 2191da177e4SLinus Torvalds kfree(info); 2201da177e4SLinus Torvalds s->s_fs_info = NULL; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds 223726c3342SDavid Howells static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2241da177e4SLinus Torvalds { 225726c3342SDavid Howells struct super_block *s = dentry->d_sb; 2261da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2271da177e4SLinus Torvalds u64 id = huge_encode_dev(s->s_bdev->bd_dev); 2281da177e4SLinus Torvalds buf->f_type = BFS_MAGIC; 2291da177e4SLinus Torvalds buf->f_bsize = s->s_blocksize; 2301da177e4SLinus Torvalds buf->f_blocks = info->si_blocks; 2311da177e4SLinus Torvalds buf->f_bfree = buf->f_bavail = info->si_freeb; 2321da177e4SLinus Torvalds buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 2331da177e4SLinus Torvalds buf->f_ffree = info->si_freei; 2341da177e4SLinus Torvalds buf->f_fsid.val[0] = (u32)id; 2351da177e4SLinus Torvalds buf->f_fsid.val[1] = (u32)(id >> 32); 2361da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN; 2371da177e4SLinus Torvalds return 0; 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds 240e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb) 2431da177e4SLinus Torvalds { 2441da177e4SLinus Torvalds struct bfs_inode_info *bi; 245e94b1766SChristoph Lameter bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 2461da177e4SLinus Torvalds if (!bi) 2471da177e4SLinus Torvalds return NULL; 2481da177e4SLinus Torvalds return &bi->vfs_inode; 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 251fa0d7e3dSNick Piggin static void bfs_i_callback(struct rcu_head *head) 252fa0d7e3dSNick Piggin { 253fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 254fa0d7e3dSNick Piggin kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 255fa0d7e3dSNick Piggin } 256fa0d7e3dSNick Piggin 2571da177e4SLinus Torvalds static void bfs_destroy_inode(struct inode *inode) 2581da177e4SLinus Torvalds { 259fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, bfs_i_callback); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 26251cc5068SAlexey Dobriyan static void init_once(void *foo) 2631da177e4SLinus Torvalds { 2641da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds static int init_inodecache(void) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 2721da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 273fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 274fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 27520c2df83SPaul Mundt init_once); 2761da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 2771da177e4SLinus Torvalds return -ENOMEM; 2781da177e4SLinus Torvalds return 0; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds static void destroy_inodecache(void) 2821da177e4SLinus Torvalds { 2838c0a8537SKirill A. Shutemov /* 2848c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 2858c0a8537SKirill A. Shutemov * destroy cache. 2868c0a8537SKirill A. Shutemov */ 2878c0a8537SKirill A. Shutemov rcu_barrier(); 2881a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 291ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 2921da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 2931da177e4SLinus Torvalds .destroy_inode = bfs_destroy_inode, 2941da177e4SLinus Torvalds .write_inode = bfs_write_inode, 2959df2f851SAl Viro .evict_inode = bfs_evict_inode, 2961da177e4SLinus Torvalds .put_super = bfs_put_super, 2971da177e4SLinus Torvalds .statfs = bfs_statfs, 2981da177e4SLinus Torvalds }; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s) 3011da177e4SLinus Torvalds { 302fac92becSAndrew Stribblehill #ifdef DEBUG 3031da177e4SLinus Torvalds int i; 3041da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds if (!tmpbuf) 3071da177e4SLinus Torvalds return; 3081da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 3091da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 3101da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3111da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3121da177e4SLinus Torvalds else 3131da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3141da177e4SLinus Torvalds } 315f433dc56SDmitri Vorobiev printf("BFS-fs: %s: lasti=%08lx <%s>\n", 316f433dc56SDmitri Vorobiev prefix, BFS_SB(s)->si_lasti, tmpbuf); 3171da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3181da177e4SLinus Torvalds #endif 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3221da177e4SLinus Torvalds { 3234e29d50aSArtem Bityutskiy struct buffer_head *bh, *sbh; 3241da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3251da177e4SLinus Torvalds struct inode *inode; 326fac92becSAndrew Stribblehill unsigned i, imap_len; 3271da177e4SLinus Torvalds struct bfs_sb_info *info; 3285998649fSAl Viro int ret = -EINVAL; 329e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3301da177e4SLinus Torvalds 331f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 332ba13d597SJan Blunck if (!info) 3331da177e4SLinus Torvalds return -ENOMEM; 3345998649fSAl Viro mutex_init(&info->bfs_lock); 3351da177e4SLinus Torvalds s->s_fs_info = info; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3381da177e4SLinus Torvalds 3394e29d50aSArtem Bityutskiy sbh = sb_bread(s, 0); 3404e29d50aSArtem Bityutskiy if (!sbh) 3411da177e4SLinus Torvalds goto out; 3424e29d50aSArtem Bityutskiy bfs_sb = (struct bfs_super_block *)sbh->b_data; 343fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3441da177e4SLinus Torvalds if (!silent) 3451da177e4SLinus Torvalds printf("No BFS filesystem on %s (magic=%08x)\n", 346fac92becSAndrew Stribblehill s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3475998649fSAl Viro goto out1; 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3501da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 353e1f89ec9SEric Sesterhenn 354e1f89ec9SEric Sesterhenn if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { 355e1f89ec9SEric Sesterhenn printf("Superblock is corrupted\n"); 3565998649fSAl Viro goto out1; 357e1f89ec9SEric Sesterhenn } 358e1f89ec9SEric Sesterhenn 359f433dc56SDmitri Vorobiev info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 360f433dc56SDmitri Vorobiev sizeof(struct bfs_inode) 3611da177e4SLinus Torvalds + BFS_ROOT_INO - 1; 362f433dc56SDmitri Vorobiev imap_len = (info->si_lasti / 8) + 1; 363f8314dc6SPanagiotis Issaris info->si_imap = kzalloc(imap_len, GFP_KERNEL); 3641da177e4SLinus Torvalds if (!info->si_imap) 3655998649fSAl Viro goto out1; 3661da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3671da177e4SLinus Torvalds set_bit(i, info->si_imap); 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds s->s_op = &bfs_sops; 370e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 371e33ab086SDavid Howells if (IS_ERR(inode)) { 372e33ab086SDavid Howells ret = PTR_ERR(inode); 3735998649fSAl Viro goto out2; 3741da177e4SLinus Torvalds } 37548fde701SAl Viro s->s_root = d_make_root(inode); 3761da177e4SLinus Torvalds if (!s->s_root) { 377e33ab086SDavid Howells ret = -ENOMEM; 3785998649fSAl Viro goto out2; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 381f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 382f433dc56SDmitri Vorobiev info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 383f433dc56SDmitri Vorobiev - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 3841da177e4SLinus Torvalds info->si_freei = 0; 3851da177e4SLinus Torvalds info->si_lf_eblk = 0; 38650682bb4SEric Sesterhenn 38750682bb4SEric Sesterhenn /* can we read the last block? */ 38850682bb4SEric Sesterhenn bh = sb_bread(s, info->si_blocks - 1); 38950682bb4SEric Sesterhenn if (!bh) { 39050682bb4SEric Sesterhenn printf("Last block not available: %lu\n", info->si_blocks - 1); 39150682bb4SEric Sesterhenn ret = -EIO; 3925998649fSAl Viro goto out3; 39350682bb4SEric Sesterhenn } 39450682bb4SEric Sesterhenn brelse(bh); 39550682bb4SEric Sesterhenn 396c2b513dfSAl Viro bh = NULL; 3971da177e4SLinus Torvalds for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 398c2b513dfSAl Viro struct bfs_inode *di; 399c2b513dfSAl Viro int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 400c2b513dfSAl Viro int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 40175b25b4cSDmitri Vorobiev unsigned long eblock; 402c2b513dfSAl Viro 403c2b513dfSAl Viro if (!off) { 404c2b513dfSAl Viro brelse(bh); 405c2b513dfSAl Viro bh = sb_bread(s, block); 406c2b513dfSAl Viro } 407c2b513dfSAl Viro 408c2b513dfSAl Viro if (!bh) 409c2b513dfSAl Viro continue; 410c2b513dfSAl Viro 411c2b513dfSAl Viro di = (struct bfs_inode *)bh->b_data + off; 412c2b513dfSAl Viro 413e1f89ec9SEric Sesterhenn /* test if filesystem is not corrupted */ 414e1f89ec9SEric Sesterhenn 415e1f89ec9SEric Sesterhenn i_eoff = le32_to_cpu(di->i_eoffset); 416e1f89ec9SEric Sesterhenn i_sblock = le32_to_cpu(di->i_sblock); 417e1f89ec9SEric Sesterhenn i_eblock = le32_to_cpu(di->i_eblock); 418e1f89ec9SEric Sesterhenn s_size = le32_to_cpu(bfs_sb->s_end); 419e1f89ec9SEric Sesterhenn 420e1f89ec9SEric Sesterhenn if (i_sblock > info->si_blocks || 421e1f89ec9SEric Sesterhenn i_eblock > info->si_blocks || 422e1f89ec9SEric Sesterhenn i_sblock > i_eblock || 423e1f89ec9SEric Sesterhenn i_eoff > s_size || 424e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 425e1f89ec9SEric Sesterhenn 426e1f89ec9SEric Sesterhenn printf("Inode 0x%08x corrupted\n", i); 427e1f89ec9SEric Sesterhenn 428e1f89ec9SEric Sesterhenn brelse(bh); 4295998649fSAl Viro ret = -EIO; 4305998649fSAl Viro goto out3; 431e1f89ec9SEric Sesterhenn } 432e1f89ec9SEric Sesterhenn 433c2b513dfSAl Viro if (!di->i_ino) { 4341da177e4SLinus Torvalds info->si_freei++; 435c2b513dfSAl Viro continue; 436c2b513dfSAl Viro } 4371da177e4SLinus Torvalds set_bit(i, info->si_imap); 438c2b513dfSAl Viro info->si_freeb -= BFS_FILEBLOCKS(di); 439c2b513dfSAl Viro 440c2b513dfSAl Viro eblock = le32_to_cpu(di->i_eblock); 441f433dc56SDmitri Vorobiev if (eblock > info->si_lf_eblk) 442c2b513dfSAl Viro info->si_lf_eblk = eblock; 4431da177e4SLinus Torvalds } 444c2b513dfSAl Viro brelse(bh); 4454e29d50aSArtem Bityutskiy brelse(sbh); 4461da177e4SLinus Torvalds dump_imap("read_super", s); 4471da177e4SLinus Torvalds return 0; 4481da177e4SLinus Torvalds 4495998649fSAl Viro out3: 4505998649fSAl Viro dput(s->s_root); 4515998649fSAl Viro s->s_root = NULL; 4525998649fSAl Viro out2: 4535998649fSAl Viro kfree(info->si_imap); 4545998649fSAl Viro out1: 4554e29d50aSArtem Bityutskiy brelse(sbh); 4561da177e4SLinus Torvalds out: 4575998649fSAl Viro mutex_destroy(&info->bfs_lock); 4581da177e4SLinus Torvalds kfree(info); 4591da177e4SLinus Torvalds s->s_fs_info = NULL; 460e33ab086SDavid Howells return ret; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 463152a0836SAl Viro static struct dentry *bfs_mount(struct file_system_type *fs_type, 464152a0836SAl Viro int flags, const char *dev_name, void *data) 4651da177e4SLinus Torvalds { 466152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super); 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 4701da177e4SLinus Torvalds .owner = THIS_MODULE, 4711da177e4SLinus Torvalds .name = "bfs", 472152a0836SAl Viro .mount = bfs_mount, 4731da177e4SLinus Torvalds .kill_sb = kill_block_super, 4741da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4751da177e4SLinus Torvalds }; 4767f78e035SEric W. Biederman MODULE_ALIAS_FS("bfs"); 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds static int __init init_bfs_fs(void) 4791da177e4SLinus Torvalds { 4801da177e4SLinus Torvalds int err = init_inodecache(); 4811da177e4SLinus Torvalds if (err) 4821da177e4SLinus Torvalds goto out1; 4831da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 4841da177e4SLinus Torvalds if (err) 4851da177e4SLinus Torvalds goto out; 4861da177e4SLinus Torvalds return 0; 4871da177e4SLinus Torvalds out: 4881da177e4SLinus Torvalds destroy_inodecache(); 4891da177e4SLinus Torvalds out1: 4901da177e4SLinus Torvalds return err; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 4941da177e4SLinus Torvalds { 4951da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 4961da177e4SLinus Torvalds destroy_inodecache(); 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds module_init(init_bfs_fs) 5001da177e4SLinus Torvalds module_exit(exit_bfs_fs) 501