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); 43e33ab086SDavid Howells if (IS_ERR(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); 79fac92becSAndrew Stribblehill inode->i_uid = le32_to_cpu(di->i_uid); 80fac92becSAndrew Stribblehill inode->i_gid = le32_to_cpu(di->i_gid); 81fac92becSAndrew Stribblehill inode->i_nlink = 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); 142fac92becSAndrew Stribblehill di->i_uid = cpu_to_le32(inode->i_uid); 143fac92becSAndrew Stribblehill di->i_gid = cpu_to_le32(inode->i_gid); 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); 1779df2f851SAl Viro end_writeback(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 2511da177e4SLinus Torvalds static void bfs_destroy_inode(struct inode *inode) 2521da177e4SLinus Torvalds { 2531da177e4SLinus Torvalds kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds 25651cc5068SAlexey Dobriyan static void init_once(void *foo) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds static int init_inodecache(void) 2641da177e4SLinus Torvalds { 2651da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 2661da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 267fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 268fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 26920c2df83SPaul Mundt init_once); 2701da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 2711da177e4SLinus Torvalds return -ENOMEM; 2721da177e4SLinus Torvalds return 0; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds static void destroy_inodecache(void) 2761da177e4SLinus Torvalds { 2771a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 280ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 2811da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 2821da177e4SLinus Torvalds .destroy_inode = bfs_destroy_inode, 2831da177e4SLinus Torvalds .write_inode = bfs_write_inode, 2849df2f851SAl Viro .evict_inode = bfs_evict_inode, 2851da177e4SLinus Torvalds .put_super = bfs_put_super, 2861da177e4SLinus Torvalds .statfs = bfs_statfs, 2871da177e4SLinus Torvalds }; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s) 2901da177e4SLinus Torvalds { 291fac92becSAndrew Stribblehill #ifdef DEBUG 2921da177e4SLinus Torvalds int i; 2931da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds if (!tmpbuf) 2961da177e4SLinus Torvalds return; 2971da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 2981da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 2991da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3001da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3011da177e4SLinus Torvalds else 3021da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3031da177e4SLinus Torvalds } 304f433dc56SDmitri Vorobiev printf("BFS-fs: %s: lasti=%08lx <%s>\n", 305f433dc56SDmitri Vorobiev prefix, BFS_SB(s)->si_lasti, tmpbuf); 3061da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3071da177e4SLinus Torvalds #endif 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3111da177e4SLinus Torvalds { 3124e29d50aSArtem Bityutskiy struct buffer_head *bh, *sbh; 3131da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3141da177e4SLinus Torvalds struct inode *inode; 315fac92becSAndrew Stribblehill unsigned i, imap_len; 3161da177e4SLinus Torvalds struct bfs_sb_info *info; 3175998649fSAl Viro int ret = -EINVAL; 318e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3191da177e4SLinus Torvalds 320f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 321ba13d597SJan Blunck if (!info) 3221da177e4SLinus Torvalds return -ENOMEM; 3235998649fSAl Viro mutex_init(&info->bfs_lock); 3241da177e4SLinus Torvalds s->s_fs_info = info; 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3271da177e4SLinus Torvalds 3284e29d50aSArtem Bityutskiy sbh = sb_bread(s, 0); 3294e29d50aSArtem Bityutskiy if (!sbh) 3301da177e4SLinus Torvalds goto out; 3314e29d50aSArtem Bityutskiy bfs_sb = (struct bfs_super_block *)sbh->b_data; 332fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3331da177e4SLinus Torvalds if (!silent) 3341da177e4SLinus Torvalds printf("No BFS filesystem on %s (magic=%08x)\n", 335fac92becSAndrew Stribblehill s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3365998649fSAl Viro goto out1; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3391da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 342e1f89ec9SEric Sesterhenn 343e1f89ec9SEric Sesterhenn if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { 344e1f89ec9SEric Sesterhenn printf("Superblock is corrupted\n"); 3455998649fSAl Viro goto out1; 346e1f89ec9SEric Sesterhenn } 347e1f89ec9SEric Sesterhenn 348f433dc56SDmitri Vorobiev info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 349f433dc56SDmitri Vorobiev sizeof(struct bfs_inode) 3501da177e4SLinus Torvalds + BFS_ROOT_INO - 1; 351f433dc56SDmitri Vorobiev imap_len = (info->si_lasti / 8) + 1; 352f8314dc6SPanagiotis Issaris info->si_imap = kzalloc(imap_len, GFP_KERNEL); 3531da177e4SLinus Torvalds if (!info->si_imap) 3545998649fSAl Viro goto out1; 3551da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3561da177e4SLinus Torvalds set_bit(i, info->si_imap); 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds s->s_op = &bfs_sops; 359e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 360e33ab086SDavid Howells if (IS_ERR(inode)) { 361e33ab086SDavid Howells ret = PTR_ERR(inode); 3625998649fSAl Viro goto out2; 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds s->s_root = d_alloc_root(inode); 3651da177e4SLinus Torvalds if (!s->s_root) { 3661da177e4SLinus Torvalds iput(inode); 367e33ab086SDavid Howells ret = -ENOMEM; 3685998649fSAl Viro goto out2; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 371f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 372f433dc56SDmitri Vorobiev info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 373f433dc56SDmitri Vorobiev - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 3741da177e4SLinus Torvalds info->si_freei = 0; 3751da177e4SLinus Torvalds info->si_lf_eblk = 0; 37650682bb4SEric Sesterhenn 37750682bb4SEric Sesterhenn /* can we read the last block? */ 37850682bb4SEric Sesterhenn bh = sb_bread(s, info->si_blocks - 1); 37950682bb4SEric Sesterhenn if (!bh) { 38050682bb4SEric Sesterhenn printf("Last block not available: %lu\n", info->si_blocks - 1); 38150682bb4SEric Sesterhenn ret = -EIO; 3825998649fSAl Viro goto out3; 38350682bb4SEric Sesterhenn } 38450682bb4SEric Sesterhenn brelse(bh); 38550682bb4SEric Sesterhenn 386c2b513dfSAl Viro bh = NULL; 3871da177e4SLinus Torvalds for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 388c2b513dfSAl Viro struct bfs_inode *di; 389c2b513dfSAl Viro int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 390c2b513dfSAl Viro int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 39175b25b4cSDmitri Vorobiev unsigned long eblock; 392c2b513dfSAl Viro 393c2b513dfSAl Viro if (!off) { 394c2b513dfSAl Viro brelse(bh); 395c2b513dfSAl Viro bh = sb_bread(s, block); 396c2b513dfSAl Viro } 397c2b513dfSAl Viro 398c2b513dfSAl Viro if (!bh) 399c2b513dfSAl Viro continue; 400c2b513dfSAl Viro 401c2b513dfSAl Viro di = (struct bfs_inode *)bh->b_data + off; 402c2b513dfSAl Viro 403e1f89ec9SEric Sesterhenn /* test if filesystem is not corrupted */ 404e1f89ec9SEric Sesterhenn 405e1f89ec9SEric Sesterhenn i_eoff = le32_to_cpu(di->i_eoffset); 406e1f89ec9SEric Sesterhenn i_sblock = le32_to_cpu(di->i_sblock); 407e1f89ec9SEric Sesterhenn i_eblock = le32_to_cpu(di->i_eblock); 408e1f89ec9SEric Sesterhenn s_size = le32_to_cpu(bfs_sb->s_end); 409e1f89ec9SEric Sesterhenn 410e1f89ec9SEric Sesterhenn if (i_sblock > info->si_blocks || 411e1f89ec9SEric Sesterhenn i_eblock > info->si_blocks || 412e1f89ec9SEric Sesterhenn i_sblock > i_eblock || 413e1f89ec9SEric Sesterhenn i_eoff > s_size || 414e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 415e1f89ec9SEric Sesterhenn 416e1f89ec9SEric Sesterhenn printf("Inode 0x%08x corrupted\n", i); 417e1f89ec9SEric Sesterhenn 418e1f89ec9SEric Sesterhenn brelse(bh); 4195998649fSAl Viro ret = -EIO; 4205998649fSAl Viro goto out3; 421e1f89ec9SEric Sesterhenn } 422e1f89ec9SEric Sesterhenn 423c2b513dfSAl Viro if (!di->i_ino) { 4241da177e4SLinus Torvalds info->si_freei++; 425c2b513dfSAl Viro continue; 426c2b513dfSAl Viro } 4271da177e4SLinus Torvalds set_bit(i, info->si_imap); 428c2b513dfSAl Viro info->si_freeb -= BFS_FILEBLOCKS(di); 429c2b513dfSAl Viro 430c2b513dfSAl Viro eblock = le32_to_cpu(di->i_eblock); 431f433dc56SDmitri Vorobiev if (eblock > info->si_lf_eblk) 432c2b513dfSAl Viro info->si_lf_eblk = eblock; 4331da177e4SLinus Torvalds } 434c2b513dfSAl Viro brelse(bh); 4354e29d50aSArtem Bityutskiy brelse(sbh); 4361da177e4SLinus Torvalds dump_imap("read_super", s); 4371da177e4SLinus Torvalds return 0; 4381da177e4SLinus Torvalds 4395998649fSAl Viro out3: 4405998649fSAl Viro dput(s->s_root); 4415998649fSAl Viro s->s_root = NULL; 4425998649fSAl Viro out2: 4435998649fSAl Viro kfree(info->si_imap); 4445998649fSAl Viro out1: 4454e29d50aSArtem Bityutskiy brelse(sbh); 4461da177e4SLinus Torvalds out: 4475998649fSAl Viro mutex_destroy(&info->bfs_lock); 4481da177e4SLinus Torvalds kfree(info); 4491da177e4SLinus Torvalds s->s_fs_info = NULL; 450e33ab086SDavid Howells return ret; 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 453152a0836SAl Viro static struct dentry *bfs_mount(struct file_system_type *fs_type, 454152a0836SAl Viro int flags, const char *dev_name, void *data) 4551da177e4SLinus Torvalds { 456152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super); 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 4601da177e4SLinus Torvalds .owner = THIS_MODULE, 4611da177e4SLinus Torvalds .name = "bfs", 462152a0836SAl Viro .mount = bfs_mount, 4631da177e4SLinus Torvalds .kill_sb = kill_block_super, 4641da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4651da177e4SLinus Torvalds }; 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds static int __init init_bfs_fs(void) 4681da177e4SLinus Torvalds { 4691da177e4SLinus Torvalds int err = init_inodecache(); 4701da177e4SLinus Torvalds if (err) 4711da177e4SLinus Torvalds goto out1; 4721da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 4731da177e4SLinus Torvalds if (err) 4741da177e4SLinus Torvalds goto out; 4751da177e4SLinus Torvalds return 0; 4761da177e4SLinus Torvalds out: 4771da177e4SLinus Torvalds destroy_inodecache(); 4781da177e4SLinus Torvalds out1: 4791da177e4SLinus Torvalds return err; 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 4831da177e4SLinus Torvalds { 4841da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 4851da177e4SLinus Torvalds destroy_inodecache(); 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds module_init(init_bfs_fs) 4891da177e4SLinus Torvalds module_exit(exit_bfs_fs) 490