11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * fs/bfs/inode.c 31da177e4SLinus Torvalds * BFS superblock and inode operations. 4d1877155STigran Aivazian * Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com> 51da177e4SLinus Torvalds * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. 6fac92becSAndrew Stribblehill * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/module.h> 101da177e4SLinus Torvalds #include <linux/mm.h> 111da177e4SLinus Torvalds #include <linux/slab.h> 121da177e4SLinus Torvalds #include <linux/init.h> 131da177e4SLinus Torvalds #include <linux/fs.h> 141da177e4SLinus Torvalds #include <linux/buffer_head.h> 151da177e4SLinus Torvalds #include <linux/vfs.h> 16a9185b41SChristoph Hellwig #include <linux/writeback.h> 17e2e40f2cSChristoph Hellwig #include <linux/uio.h> 187c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 191da177e4SLinus Torvalds #include "bfs.h" 201da177e4SLinus Torvalds 21cea58224SAndrew Morton MODULE_AUTHOR("Tigran Aivazian <aivazian.tigran@gmail.com>"); 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 33e33ab086SDavid Howells struct inode *bfs_iget(struct super_block *sb, unsigned long ino) 341da177e4SLinus Torvalds { 351da177e4SLinus Torvalds struct bfs_inode *di; 36e33ab086SDavid Howells struct inode *inode; 371da177e4SLinus Torvalds struct buffer_head *bh; 381da177e4SLinus Torvalds int block, off; 391da177e4SLinus Torvalds 40e33ab086SDavid Howells inode = iget_locked(sb, ino); 41821ff77cSDan Carpenter if (!inode) 42e33ab086SDavid Howells return ERR_PTR(-ENOMEM); 43e33ab086SDavid Howells if (!(inode->i_state & I_NEW)) 44e33ab086SDavid Howells return inode; 45e33ab086SDavid Howells 46f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 471da177e4SLinus Torvalds printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); 48e33ab086SDavid Howells goto error; 491da177e4SLinus Torvalds } 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 521da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 531da177e4SLinus Torvalds if (!bh) { 54f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, 55f433dc56SDmitri Vorobiev ino); 56e33ab086SDavid Howells goto error; 571da177e4SLinus Torvalds } 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 601da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 611da177e4SLinus Torvalds 62fac92becSAndrew Stribblehill inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 63fac92becSAndrew Stribblehill if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 641da177e4SLinus Torvalds inode->i_mode |= S_IFDIR; 651da177e4SLinus Torvalds inode->i_op = &bfs_dir_inops; 661da177e4SLinus Torvalds inode->i_fop = &bfs_dir_operations; 67fac92becSAndrew Stribblehill } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 681da177e4SLinus Torvalds inode->i_mode |= S_IFREG; 691da177e4SLinus Torvalds inode->i_op = &bfs_file_inops; 701da177e4SLinus Torvalds inode->i_fop = &bfs_file_operations; 711da177e4SLinus Torvalds inode->i_mapping->a_ops = &bfs_aops; 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds 74fac92becSAndrew Stribblehill BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 75fac92becSAndrew Stribblehill BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 76f433dc56SDmitri Vorobiev BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); 777f5b82b8SEric W. Biederman i_uid_write(inode, le32_to_cpu(di->i_uid)); 787f5b82b8SEric W. Biederman i_gid_write(inode, le32_to_cpu(di->i_gid)); 79bfe86848SMiklos Szeredi set_nlink(inode, le32_to_cpu(di->i_nlink)); 801da177e4SLinus Torvalds inode->i_size = BFS_FILESIZE(di); 811da177e4SLinus Torvalds inode->i_blocks = BFS_FILEBLOCKS(di); 82fac92becSAndrew Stribblehill inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 83fac92becSAndrew Stribblehill inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 84fac92becSAndrew Stribblehill inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 851da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0; 861da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; 871da177e4SLinus Torvalds inode->i_ctime.tv_nsec = 0; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds brelse(bh); 90e33ab086SDavid Howells unlock_new_inode(inode); 91e33ab086SDavid Howells return inode; 92e33ab086SDavid Howells 93e33ab086SDavid Howells error: 94e33ab086SDavid Howells iget_failed(inode); 95e33ab086SDavid Howells return ERR_PTR(-EIO); 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 989df2f851SAl Viro static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p) 999df2f851SAl Viro { 1009df2f851SAl Viro if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) { 1019df2f851SAl Viro printf("Bad inode number %s:%08x\n", sb->s_id, ino); 1029df2f851SAl Viro return ERR_PTR(-EIO); 1039df2f851SAl Viro } 1049df2f851SAl Viro 1059df2f851SAl Viro ino -= BFS_ROOT_INO; 1069df2f851SAl Viro 1079df2f851SAl Viro *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK); 1089df2f851SAl Viro if (!*p) { 1099df2f851SAl Viro printf("Unable to read inode %s:%08x\n", sb->s_id, ino); 1109df2f851SAl Viro return ERR_PTR(-EIO); 1119df2f851SAl Viro } 1129df2f851SAl Viro 1139df2f851SAl Viro return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK; 1149df2f851SAl Viro } 1159df2f851SAl Viro 116a9185b41SChristoph Hellwig static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) 1171da177e4SLinus Torvalds { 1184427f0c3SAl Viro struct bfs_sb_info *info = BFS_SB(inode->i_sb); 119fac92becSAndrew Stribblehill unsigned int ino = (u16)inode->i_ino; 120fac92becSAndrew Stribblehill unsigned long i_sblock; 1211da177e4SLinus Torvalds struct bfs_inode *di; 1221da177e4SLinus Torvalds struct buffer_head *bh; 1234427f0c3SAl Viro int err = 0; 1241da177e4SLinus Torvalds 125fac92becSAndrew Stribblehill dprintf("ino=%08x\n", ino); 126fac92becSAndrew Stribblehill 1279df2f851SAl Viro di = find_inode(inode->i_sb, ino, &bh); 1289df2f851SAl Viro if (IS_ERR(di)) 1299df2f851SAl Viro return PTR_ERR(di); 1301da177e4SLinus Torvalds 1313f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1321da177e4SLinus Torvalds 133fac92becSAndrew Stribblehill if (ino == BFS_ROOT_INO) 134fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VDIR); 1351da177e4SLinus Torvalds else 136fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VREG); 1371da177e4SLinus Torvalds 138fac92becSAndrew Stribblehill di->i_ino = cpu_to_le16(ino); 139fac92becSAndrew Stribblehill di->i_mode = cpu_to_le32(inode->i_mode); 1407f5b82b8SEric W. Biederman di->i_uid = cpu_to_le32(i_uid_read(inode)); 1417f5b82b8SEric W. Biederman di->i_gid = cpu_to_le32(i_gid_read(inode)); 142fac92becSAndrew Stribblehill di->i_nlink = cpu_to_le32(inode->i_nlink); 143fac92becSAndrew Stribblehill di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 144fac92becSAndrew Stribblehill di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 145fac92becSAndrew Stribblehill di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 146fac92becSAndrew Stribblehill i_sblock = BFS_I(inode)->i_sblock; 147fac92becSAndrew Stribblehill di->i_sblock = cpu_to_le32(i_sblock); 148fac92becSAndrew Stribblehill di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 149fac92becSAndrew Stribblehill di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds mark_buffer_dirty(bh); 152a9185b41SChristoph Hellwig if (wbc->sync_mode == WB_SYNC_ALL) { 1534427f0c3SAl Viro sync_dirty_buffer(bh); 1544427f0c3SAl Viro if (buffer_req(bh) && !buffer_uptodate(bh)) 1554427f0c3SAl Viro err = -EIO; 1564427f0c3SAl Viro } 1571da177e4SLinus Torvalds brelse(bh); 1583f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1594427f0c3SAl Viro return err; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1629df2f851SAl Viro static void bfs_evict_inode(struct inode *inode) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds unsigned long ino = inode->i_ino; 1651da177e4SLinus Torvalds struct bfs_inode *di; 1661da177e4SLinus Torvalds struct buffer_head *bh; 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 17391b0abe3SJohannes Weiner truncate_inode_pages_final(&inode->i_data); 1749df2f851SAl Viro invalidate_inode_buffers(inode); 175dbd5768fSJan Kara clear_inode(inode); 176fef26658SMark Fasheh 1779df2f851SAl Viro if (inode->i_nlink) 1781da177e4SLinus Torvalds return; 1791da177e4SLinus Torvalds 1809df2f851SAl Viro di = find_inode(s, inode->i_ino, &bh); 1819df2f851SAl Viro if (IS_ERR(di)) 1829df2f851SAl Viro return; 1839df2f851SAl Viro 1843f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1859df2f851SAl Viro /* clear on-disk inode */ 1869df2f851SAl Viro memset(di, 0, sizeof(struct bfs_inode)); 187f433dc56SDmitri Vorobiev mark_buffer_dirty(bh); 188f433dc56SDmitri Vorobiev brelse(bh); 189f433dc56SDmitri Vorobiev 190fac92becSAndrew Stribblehill if (bi->i_dsk_ino) { 1917e46aa5cSAl Viro if (bi->i_sblock) 1927e46aa5cSAl Viro info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 1931da177e4SLinus Torvalds info->si_freei++; 194fac92becSAndrew Stribblehill clear_bit(ino, info->si_imap); 195d1877155STigran Aivazian bfs_dump_imap("evict_inode", s); 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds 198f433dc56SDmitri Vorobiev /* 199f433dc56SDmitri Vorobiev * If this was the last file, make the previous block 200f433dc56SDmitri Vorobiev * "last block of the last file" even if there is no 201f433dc56SDmitri Vorobiev * real file there, saves us 1 gap. 202f433dc56SDmitri Vorobiev */ 2034e29d50aSArtem Bityutskiy if (info->si_lf_eblk == bi->i_eblock) 204f433dc56SDmitri Vorobiev info->si_lf_eblk = bi->i_sblock - 1; 2053f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds static void bfs_put_super(struct super_block *s) 2091da177e4SLinus Torvalds { 2101da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2113f165e4cSDmitri Vorobiev 212e1f89ec9SEric Sesterhenn if (!info) 213e1f89ec9SEric Sesterhenn return; 214e1f89ec9SEric Sesterhenn 2153f165e4cSDmitri Vorobiev mutex_destroy(&info->bfs_lock); 2161da177e4SLinus Torvalds kfree(info); 2171da177e4SLinus Torvalds s->s_fs_info = NULL; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 220726c3342SDavid Howells static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2211da177e4SLinus Torvalds { 222726c3342SDavid Howells struct super_block *s = dentry->d_sb; 2231da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2241da177e4SLinus Torvalds u64 id = huge_encode_dev(s->s_bdev->bd_dev); 2251da177e4SLinus Torvalds buf->f_type = BFS_MAGIC; 2261da177e4SLinus Torvalds buf->f_bsize = s->s_blocksize; 2271da177e4SLinus Torvalds buf->f_blocks = info->si_blocks; 2281da177e4SLinus Torvalds buf->f_bfree = buf->f_bavail = info->si_freeb; 2291da177e4SLinus Torvalds buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 2301da177e4SLinus Torvalds buf->f_ffree = info->si_freei; 2311da177e4SLinus Torvalds buf->f_fsid.val[0] = (u32)id; 2321da177e4SLinus Torvalds buf->f_fsid.val[1] = (u32)(id >> 32); 2331da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN; 2341da177e4SLinus Torvalds return 0; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 237e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds struct bfs_inode_info *bi; 242e94b1766SChristoph Lameter bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 2431da177e4SLinus Torvalds if (!bi) 2441da177e4SLinus Torvalds return NULL; 2451da177e4SLinus Torvalds return &bi->vfs_inode; 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds 248fa0d7e3dSNick Piggin static void bfs_i_callback(struct rcu_head *head) 249fa0d7e3dSNick Piggin { 250fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 251fa0d7e3dSNick Piggin kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 252fa0d7e3dSNick Piggin } 253fa0d7e3dSNick Piggin 2541da177e4SLinus Torvalds static void bfs_destroy_inode(struct inode *inode) 2551da177e4SLinus Torvalds { 256fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, bfs_i_callback); 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 25951cc5068SAlexey Dobriyan static void init_once(void *foo) 2601da177e4SLinus Torvalds { 2611da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 266758b4440SFabian Frederick static int __init init_inodecache(void) 2671da177e4SLinus Torvalds { 2681da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 2691da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 270fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 2715d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT), 27220c2df83SPaul Mundt init_once); 2731da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 2741da177e4SLinus Torvalds return -ENOMEM; 2751da177e4SLinus Torvalds return 0; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds static void destroy_inodecache(void) 2791da177e4SLinus Torvalds { 2808c0a8537SKirill A. Shutemov /* 2818c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 2828c0a8537SKirill A. Shutemov * destroy cache. 2838c0a8537SKirill A. Shutemov */ 2848c0a8537SKirill A. Shutemov rcu_barrier(); 2851a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 288ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 2891da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 2901da177e4SLinus Torvalds .destroy_inode = bfs_destroy_inode, 2911da177e4SLinus Torvalds .write_inode = bfs_write_inode, 2929df2f851SAl Viro .evict_inode = bfs_evict_inode, 2931da177e4SLinus Torvalds .put_super = bfs_put_super, 2941da177e4SLinus Torvalds .statfs = bfs_statfs, 2951da177e4SLinus Torvalds }; 2961da177e4SLinus Torvalds 2971da85fdfSFabian Frederick void bfs_dump_imap(const char *prefix, struct super_block *s) 2981da177e4SLinus Torvalds { 299fac92becSAndrew Stribblehill #ifdef DEBUG 3001da177e4SLinus Torvalds int i; 3011da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds if (!tmpbuf) 3041da177e4SLinus Torvalds return; 3051da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 3061da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 3071da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3081da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3091da177e4SLinus Torvalds else 3101da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3111da177e4SLinus Torvalds } 312d1877155STigran Aivazian printf("%s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); 3131da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3141da177e4SLinus Torvalds #endif 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3181da177e4SLinus Torvalds { 3194e29d50aSArtem Bityutskiy struct buffer_head *bh, *sbh; 3201da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3211da177e4SLinus Torvalds struct inode *inode; 322d1877155STigran Aivazian unsigned i; 3231da177e4SLinus Torvalds struct bfs_sb_info *info; 3245998649fSAl Viro int ret = -EINVAL; 325e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3261da177e4SLinus Torvalds 327f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 328ba13d597SJan Blunck if (!info) 3291da177e4SLinus Torvalds return -ENOMEM; 3305998649fSAl Viro mutex_init(&info->bfs_lock); 3311da177e4SLinus Torvalds s->s_fs_info = info; 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3341da177e4SLinus Torvalds 3354e29d50aSArtem Bityutskiy sbh = sb_bread(s, 0); 3364e29d50aSArtem Bityutskiy if (!sbh) 3371da177e4SLinus Torvalds goto out; 3384e29d50aSArtem Bityutskiy bfs_sb = (struct bfs_super_block *)sbh->b_data; 339fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3401da177e4SLinus Torvalds if (!silent) 341d1877155STigran Aivazian printf("No BFS filesystem on %s (magic=%08x)\n", s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3425998649fSAl Viro goto out1; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3451da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 348e1f89ec9SEric Sesterhenn 3499f2df09aSTetsuo Handa if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end) || 350d1877155STigran Aivazian le32_to_cpu(bfs_sb->s_start) < sizeof(struct bfs_super_block) + sizeof(struct bfs_dirent)) { 351d1877155STigran Aivazian printf("Superblock is corrupted on %s\n", s->s_id); 3525998649fSAl Viro goto out1; 353e1f89ec9SEric Sesterhenn } 354e1f89ec9SEric Sesterhenn 355d1877155STigran Aivazian info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / sizeof(struct bfs_inode) + BFS_ROOT_INO - 1; 356d1877155STigran Aivazian if (info->si_lasti == BFS_MAX_LASTI) 357d1877155STigran Aivazian printf("WARNING: filesystem %s was created with 512 inodes, the real maximum is 511, mounting anyway\n", s->s_id); 358d1877155STigran Aivazian else if (info->si_lasti > BFS_MAX_LASTI) { 359d1877155STigran Aivazian printf("Impossible last inode number %lu > %d on %s\n", info->si_lasti, BFS_MAX_LASTI, s->s_id); 3605998649fSAl Viro goto out1; 3619f2df09aSTetsuo Handa } 3621da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3631da177e4SLinus Torvalds set_bit(i, info->si_imap); 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds s->s_op = &bfs_sops; 366e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 367e33ab086SDavid Howells if (IS_ERR(inode)) { 368e33ab086SDavid Howells ret = PTR_ERR(inode); 369d1877155STigran Aivazian goto out1; 3701da177e4SLinus Torvalds } 37148fde701SAl Viro s->s_root = d_make_root(inode); 3721da177e4SLinus Torvalds if (!s->s_root) { 373e33ab086SDavid Howells ret = -ENOMEM; 374d1877155STigran Aivazian goto out1; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 377f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 378d1877155STigran Aivazian info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 3791da177e4SLinus Torvalds info->si_freei = 0; 3801da177e4SLinus Torvalds info->si_lf_eblk = 0; 38150682bb4SEric Sesterhenn 38250682bb4SEric Sesterhenn /* can we read the last block? */ 38350682bb4SEric Sesterhenn bh = sb_bread(s, info->si_blocks - 1); 38450682bb4SEric Sesterhenn if (!bh) { 385d1877155STigran Aivazian printf("Last block not available on %s: %lu\n", s->s_id, info->si_blocks - 1); 38650682bb4SEric Sesterhenn ret = -EIO; 387d1877155STigran Aivazian goto out2; 38850682bb4SEric Sesterhenn } 38950682bb4SEric Sesterhenn brelse(bh); 39050682bb4SEric Sesterhenn 391c2b513dfSAl Viro bh = NULL; 3921da177e4SLinus Torvalds for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 393c2b513dfSAl Viro struct bfs_inode *di; 394c2b513dfSAl Viro int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 395c2b513dfSAl Viro int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 39675b25b4cSDmitri Vorobiev unsigned long eblock; 397c2b513dfSAl Viro 398c2b513dfSAl Viro if (!off) { 399c2b513dfSAl Viro brelse(bh); 400c2b513dfSAl Viro bh = sb_bread(s, block); 401c2b513dfSAl Viro } 402c2b513dfSAl Viro 403c2b513dfSAl Viro if (!bh) 404c2b513dfSAl Viro continue; 405c2b513dfSAl Viro 406c2b513dfSAl Viro di = (struct bfs_inode *)bh->b_data + off; 407c2b513dfSAl Viro 408e1f89ec9SEric Sesterhenn /* test if filesystem is not corrupted */ 409e1f89ec9SEric Sesterhenn 410e1f89ec9SEric Sesterhenn i_eoff = le32_to_cpu(di->i_eoffset); 411e1f89ec9SEric Sesterhenn i_sblock = le32_to_cpu(di->i_sblock); 412e1f89ec9SEric Sesterhenn i_eblock = le32_to_cpu(di->i_eblock); 413e1f89ec9SEric Sesterhenn s_size = le32_to_cpu(bfs_sb->s_end); 414e1f89ec9SEric Sesterhenn 415e1f89ec9SEric Sesterhenn if (i_sblock > info->si_blocks || 416e1f89ec9SEric Sesterhenn i_eblock > info->si_blocks || 417e1f89ec9SEric Sesterhenn i_sblock > i_eblock || 4185f9f48f5SRakesh Pandit (i_eoff != le32_to_cpu(-1) && i_eoff > s_size) || 419e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 420e1f89ec9SEric Sesterhenn 421d1877155STigran Aivazian printf("Inode 0x%08x corrupted on %s\n", i, s->s_id); 422e1f89ec9SEric Sesterhenn 423e1f89ec9SEric Sesterhenn brelse(bh); 4245998649fSAl Viro ret = -EIO; 425d1877155STigran Aivazian goto out2; 426e1f89ec9SEric Sesterhenn } 427e1f89ec9SEric Sesterhenn 428c2b513dfSAl Viro if (!di->i_ino) { 4291da177e4SLinus Torvalds info->si_freei++; 430c2b513dfSAl Viro continue; 431c2b513dfSAl Viro } 4321da177e4SLinus Torvalds set_bit(i, info->si_imap); 433c2b513dfSAl Viro info->si_freeb -= BFS_FILEBLOCKS(di); 434c2b513dfSAl Viro 435c2b513dfSAl Viro eblock = le32_to_cpu(di->i_eblock); 436f433dc56SDmitri Vorobiev if (eblock > info->si_lf_eblk) 437c2b513dfSAl Viro info->si_lf_eblk = eblock; 4381da177e4SLinus Torvalds } 439c2b513dfSAl Viro brelse(bh); 4404e29d50aSArtem Bityutskiy brelse(sbh); 441d1877155STigran Aivazian bfs_dump_imap("fill_super", s); 4421da177e4SLinus Torvalds return 0; 4431da177e4SLinus Torvalds 444d1877155STigran Aivazian out2: 4455998649fSAl Viro dput(s->s_root); 4465998649fSAl Viro s->s_root = NULL; 4475998649fSAl Viro out1: 4484e29d50aSArtem Bityutskiy brelse(sbh); 4491da177e4SLinus Torvalds out: 4505998649fSAl Viro mutex_destroy(&info->bfs_lock); 4511da177e4SLinus Torvalds kfree(info); 4521da177e4SLinus Torvalds s->s_fs_info = NULL; 453e33ab086SDavid Howells return ret; 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds 456152a0836SAl Viro static struct dentry *bfs_mount(struct file_system_type *fs_type, 457152a0836SAl Viro int flags, const char *dev_name, void *data) 4581da177e4SLinus Torvalds { 459152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super); 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 4631da177e4SLinus Torvalds .owner = THIS_MODULE, 4641da177e4SLinus Torvalds .name = "bfs", 465152a0836SAl Viro .mount = bfs_mount, 4661da177e4SLinus Torvalds .kill_sb = kill_block_super, 4671da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4681da177e4SLinus Torvalds }; 4697f78e035SEric W. Biederman MODULE_ALIAS_FS("bfs"); 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds static int __init init_bfs_fs(void) 4721da177e4SLinus Torvalds { 4731da177e4SLinus Torvalds int err = init_inodecache(); 4741da177e4SLinus Torvalds if (err) 4751da177e4SLinus Torvalds goto out1; 4761da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 4771da177e4SLinus Torvalds if (err) 4781da177e4SLinus Torvalds goto out; 4791da177e4SLinus Torvalds return 0; 4801da177e4SLinus Torvalds out: 4811da177e4SLinus Torvalds destroy_inodecache(); 4821da177e4SLinus Torvalds out1: 4831da177e4SLinus Torvalds return err; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 4871da177e4SLinus Torvalds { 4881da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 4891da177e4SLinus Torvalds destroy_inodecache(); 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds module_init(init_bfs_fs) 4931da177e4SLinus Torvalds module_exit(exit_bfs_fs) 494