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 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 1001da177e4SLinus Torvalds static int bfs_write_inode(struct inode *inode, int unused) 1011da177e4SLinus Torvalds { 102fac92becSAndrew Stribblehill unsigned int ino = (u16)inode->i_ino; 103fac92becSAndrew Stribblehill unsigned long i_sblock; 1041da177e4SLinus Torvalds struct bfs_inode *di; 1051da177e4SLinus Torvalds struct buffer_head *bh; 1061da177e4SLinus Torvalds int block, off; 1073f165e4cSDmitri Vorobiev struct bfs_sb_info *info = BFS_SB(inode->i_sb); 1081da177e4SLinus Torvalds 109fac92becSAndrew Stribblehill dprintf("ino=%08x\n", ino); 110fac92becSAndrew Stribblehill 111f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 112fac92becSAndrew Stribblehill printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); 1131da177e4SLinus Torvalds return -EIO; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1163f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1171da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 1181da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 1191da177e4SLinus Torvalds if (!bh) { 120f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08x\n", 121f433dc56SDmitri Vorobiev inode->i_sb->s_id, ino); 1223f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1231da177e4SLinus Torvalds return -EIO; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 1271da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 1281da177e4SLinus Torvalds 129fac92becSAndrew Stribblehill if (ino == BFS_ROOT_INO) 130fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VDIR); 1311da177e4SLinus Torvalds else 132fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VREG); 1331da177e4SLinus Torvalds 134fac92becSAndrew Stribblehill di->i_ino = cpu_to_le16(ino); 135fac92becSAndrew Stribblehill di->i_mode = cpu_to_le32(inode->i_mode); 136fac92becSAndrew Stribblehill di->i_uid = cpu_to_le32(inode->i_uid); 137fac92becSAndrew Stribblehill di->i_gid = cpu_to_le32(inode->i_gid); 138fac92becSAndrew Stribblehill di->i_nlink = cpu_to_le32(inode->i_nlink); 139fac92becSAndrew Stribblehill di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 140fac92becSAndrew Stribblehill di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 141fac92becSAndrew Stribblehill di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 142fac92becSAndrew Stribblehill i_sblock = BFS_I(inode)->i_sblock; 143fac92becSAndrew Stribblehill di->i_sblock = cpu_to_le32(i_sblock); 144fac92becSAndrew Stribblehill di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 145fac92becSAndrew Stribblehill di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds mark_buffer_dirty(bh); 1481da177e4SLinus Torvalds brelse(bh); 1493f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1501da177e4SLinus Torvalds return 0; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds static void bfs_delete_inode(struct inode *inode) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds unsigned long ino = inode->i_ino; 1561da177e4SLinus Torvalds struct bfs_inode *di; 1571da177e4SLinus Torvalds struct buffer_head *bh; 1581da177e4SLinus Torvalds int block, off; 1591da177e4SLinus Torvalds struct super_block *s = inode->i_sb; 1601da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 161fac92becSAndrew Stribblehill struct bfs_inode_info *bi = BFS_I(inode); 1621da177e4SLinus Torvalds 163fac92becSAndrew Stribblehill dprintf("ino=%08lx\n", ino); 1641da177e4SLinus Torvalds 165fef26658SMark Fasheh truncate_inode_pages(&inode->i_data, 0); 166fef26658SMark Fasheh 167f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) { 168fac92becSAndrew Stribblehill printf("invalid ino=%08lx\n", ino); 1691da177e4SLinus Torvalds return; 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds inode->i_size = 0; 1731da177e4SLinus Torvalds inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; 1743f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1751da177e4SLinus Torvalds mark_inode_dirty(inode); 176f433dc56SDmitri Vorobiev 1771da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 1781da177e4SLinus Torvalds bh = sb_bread(s, block); 1791da177e4SLinus Torvalds if (!bh) { 180f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", 181f433dc56SDmitri Vorobiev inode->i_sb->s_id, ino); 1823f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1831da177e4SLinus Torvalds return; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 1861da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 187f433dc56SDmitri Vorobiev memset((void *)di, 0, sizeof(struct bfs_inode)); 188f433dc56SDmitri Vorobiev mark_buffer_dirty(bh); 189f433dc56SDmitri Vorobiev brelse(bh); 190f433dc56SDmitri Vorobiev 191fac92becSAndrew Stribblehill if (bi->i_dsk_ino) { 1927e46aa5cSAl Viro if (bi->i_sblock) 1937e46aa5cSAl Viro info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 1941da177e4SLinus Torvalds info->si_freei++; 195fac92becSAndrew Stribblehill clear_bit(ino, info->si_imap); 1961da177e4SLinus Torvalds dump_imap("delete_inode", s); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 199f433dc56SDmitri Vorobiev /* 200f433dc56SDmitri Vorobiev * If this was the last file, make the previous block 201f433dc56SDmitri Vorobiev * "last block of the last file" even if there is no 202f433dc56SDmitri Vorobiev * real file there, saves us 1 gap. 203f433dc56SDmitri Vorobiev */ 204f433dc56SDmitri Vorobiev if (info->si_lf_eblk == bi->i_eblock) { 205f433dc56SDmitri Vorobiev info->si_lf_eblk = bi->i_sblock - 1; 2061da177e4SLinus Torvalds mark_buffer_dirty(info->si_sbh); 2071da177e4SLinus Torvalds } 2083f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2091da177e4SLinus Torvalds clear_inode(inode); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds static void bfs_put_super(struct super_block *s) 2131da177e4SLinus Torvalds { 2141da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2153f165e4cSDmitri Vorobiev 216e1f89ec9SEric Sesterhenn if (!info) 217e1f89ec9SEric Sesterhenn return; 218e1f89ec9SEric Sesterhenn 2191da177e4SLinus Torvalds brelse(info->si_sbh); 2203f165e4cSDmitri Vorobiev mutex_destroy(&info->bfs_lock); 2211da177e4SLinus Torvalds kfree(info->si_imap); 2221da177e4SLinus Torvalds kfree(info); 2231da177e4SLinus Torvalds s->s_fs_info = NULL; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds 226726c3342SDavid Howells static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2271da177e4SLinus Torvalds { 228726c3342SDavid Howells struct super_block *s = dentry->d_sb; 2291da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2301da177e4SLinus Torvalds u64 id = huge_encode_dev(s->s_bdev->bd_dev); 2311da177e4SLinus Torvalds buf->f_type = BFS_MAGIC; 2321da177e4SLinus Torvalds buf->f_bsize = s->s_blocksize; 2331da177e4SLinus Torvalds buf->f_blocks = info->si_blocks; 2341da177e4SLinus Torvalds buf->f_bfree = buf->f_bavail = info->si_freeb; 2351da177e4SLinus Torvalds buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 2361da177e4SLinus Torvalds buf->f_ffree = info->si_freei; 2371da177e4SLinus Torvalds buf->f_fsid.val[0] = (u32)id; 2381da177e4SLinus Torvalds buf->f_fsid.val[1] = (u32)(id >> 32); 2391da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN; 2401da177e4SLinus Torvalds return 0; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds static void bfs_write_super(struct super_block *s) 2441da177e4SLinus Torvalds { 2453f165e4cSDmitri Vorobiev struct bfs_sb_info *info = BFS_SB(s); 2463f165e4cSDmitri Vorobiev 2473f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 2481da177e4SLinus Torvalds if (!(s->s_flags & MS_RDONLY)) 2493f165e4cSDmitri Vorobiev mark_buffer_dirty(info->si_sbh); 2501da177e4SLinus Torvalds s->s_dirt = 0; 2513f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 254e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep; 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds struct bfs_inode_info *bi; 259e94b1766SChristoph Lameter bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 2601da177e4SLinus Torvalds if (!bi) 2611da177e4SLinus Torvalds return NULL; 2621da177e4SLinus Torvalds return &bi->vfs_inode; 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds static void bfs_destroy_inode(struct inode *inode) 2661da177e4SLinus Torvalds { 2671da177e4SLinus Torvalds kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds 27051cc5068SAlexey Dobriyan static void init_once(void *foo) 2711da177e4SLinus Torvalds { 2721da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds static int init_inodecache(void) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 2801da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 281fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 282fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 28320c2df83SPaul Mundt init_once); 2841da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 2851da177e4SLinus Torvalds return -ENOMEM; 2861da177e4SLinus Torvalds return 0; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds static void destroy_inodecache(void) 2901da177e4SLinus Torvalds { 2911a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 294ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 2951da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 2961da177e4SLinus Torvalds .destroy_inode = bfs_destroy_inode, 2971da177e4SLinus Torvalds .write_inode = bfs_write_inode, 2981da177e4SLinus Torvalds .delete_inode = bfs_delete_inode, 2991da177e4SLinus Torvalds .put_super = bfs_put_super, 3001da177e4SLinus Torvalds .write_super = bfs_write_super, 3011da177e4SLinus Torvalds .statfs = bfs_statfs, 3021da177e4SLinus Torvalds }; 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds void dump_imap(const char *prefix, struct super_block *s) 3051da177e4SLinus Torvalds { 306fac92becSAndrew Stribblehill #ifdef DEBUG 3071da177e4SLinus Torvalds int i; 3081da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds if (!tmpbuf) 3111da177e4SLinus Torvalds return; 3121da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 3131da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 3141da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3151da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3161da177e4SLinus Torvalds else 3171da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3181da177e4SLinus Torvalds } 319f433dc56SDmitri Vorobiev printf("BFS-fs: %s: lasti=%08lx <%s>\n", 320f433dc56SDmitri Vorobiev prefix, BFS_SB(s)->si_lasti, tmpbuf); 3211da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3221da177e4SLinus Torvalds #endif 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3261da177e4SLinus Torvalds { 3271da177e4SLinus Torvalds struct buffer_head *bh; 3281da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3291da177e4SLinus Torvalds struct inode *inode; 330fac92becSAndrew Stribblehill unsigned i, imap_len; 3311da177e4SLinus Torvalds struct bfs_sb_info *info; 332e33ab086SDavid Howells long ret = -EINVAL; 333e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3341da177e4SLinus Torvalds 335f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 3361da177e4SLinus Torvalds if (!info) 3371da177e4SLinus Torvalds return -ENOMEM; 3381da177e4SLinus Torvalds s->s_fs_info = info; 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds bh = sb_bread(s, 0); 3431da177e4SLinus Torvalds if(!bh) 3441da177e4SLinus Torvalds goto out; 3451da177e4SLinus Torvalds bfs_sb = (struct bfs_super_block *)bh->b_data; 346fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3471da177e4SLinus Torvalds if (!silent) 3481da177e4SLinus Torvalds printf("No BFS filesystem on %s (magic=%08x)\n", 349fac92becSAndrew Stribblehill s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3501da177e4SLinus Torvalds goto out; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3531da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 3561da177e4SLinus Torvalds info->si_sbh = bh; 357e1f89ec9SEric Sesterhenn 358e1f89ec9SEric Sesterhenn if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { 359e1f89ec9SEric Sesterhenn printf("Superblock is corrupted\n"); 360e1f89ec9SEric Sesterhenn goto out; 361e1f89ec9SEric Sesterhenn } 362e1f89ec9SEric Sesterhenn 363f433dc56SDmitri Vorobiev info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 364f433dc56SDmitri Vorobiev sizeof(struct bfs_inode) 3651da177e4SLinus Torvalds + BFS_ROOT_INO - 1; 366f433dc56SDmitri Vorobiev imap_len = (info->si_lasti / 8) + 1; 367f8314dc6SPanagiotis Issaris info->si_imap = kzalloc(imap_len, GFP_KERNEL); 3681da177e4SLinus Torvalds if (!info->si_imap) 3691da177e4SLinus Torvalds goto out; 3701da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3711da177e4SLinus Torvalds set_bit(i, info->si_imap); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds s->s_op = &bfs_sops; 374e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 375e33ab086SDavid Howells if (IS_ERR(inode)) { 376e33ab086SDavid Howells ret = PTR_ERR(inode); 3771da177e4SLinus Torvalds kfree(info->si_imap); 3781da177e4SLinus Torvalds goto out; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds s->s_root = d_alloc_root(inode); 3811da177e4SLinus Torvalds if (!s->s_root) { 3821da177e4SLinus Torvalds iput(inode); 383e33ab086SDavid Howells ret = -ENOMEM; 3841da177e4SLinus Torvalds kfree(info->si_imap); 3851da177e4SLinus Torvalds goto out; 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 388f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 389f433dc56SDmitri Vorobiev info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 390f433dc56SDmitri Vorobiev - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 3911da177e4SLinus Torvalds info->si_freei = 0; 3921da177e4SLinus Torvalds info->si_lf_eblk = 0; 393c2b513dfSAl Viro bh = NULL; 3941da177e4SLinus Torvalds for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 395c2b513dfSAl Viro struct bfs_inode *di; 396c2b513dfSAl Viro int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 397c2b513dfSAl Viro int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 39875b25b4cSDmitri Vorobiev unsigned long eblock; 399c2b513dfSAl Viro 400c2b513dfSAl Viro if (!off) { 401c2b513dfSAl Viro brelse(bh); 402c2b513dfSAl Viro bh = sb_bread(s, block); 403c2b513dfSAl Viro } 404c2b513dfSAl Viro 405c2b513dfSAl Viro if (!bh) 406c2b513dfSAl Viro continue; 407c2b513dfSAl Viro 408c2b513dfSAl Viro di = (struct bfs_inode *)bh->b_data + off; 409c2b513dfSAl Viro 410e1f89ec9SEric Sesterhenn /* test if filesystem is not corrupted */ 411e1f89ec9SEric Sesterhenn 412e1f89ec9SEric Sesterhenn i_eoff = le32_to_cpu(di->i_eoffset); 413e1f89ec9SEric Sesterhenn i_sblock = le32_to_cpu(di->i_sblock); 414e1f89ec9SEric Sesterhenn i_eblock = le32_to_cpu(di->i_eblock); 415e1f89ec9SEric Sesterhenn s_size = le32_to_cpu(bfs_sb->s_end); 416e1f89ec9SEric Sesterhenn 417e1f89ec9SEric Sesterhenn if (i_sblock > info->si_blocks || 418e1f89ec9SEric Sesterhenn i_eblock > info->si_blocks || 419e1f89ec9SEric Sesterhenn i_sblock > i_eblock || 420e1f89ec9SEric Sesterhenn i_eoff > s_size || 421e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 422e1f89ec9SEric Sesterhenn 423e1f89ec9SEric Sesterhenn printf("Inode 0x%08x corrupted\n", i); 424e1f89ec9SEric Sesterhenn 425e1f89ec9SEric Sesterhenn brelse(bh); 426e1f89ec9SEric Sesterhenn s->s_root = NULL; 427e1f89ec9SEric Sesterhenn kfree(info->si_imap); 428e1f89ec9SEric Sesterhenn kfree(info); 429e1f89ec9SEric Sesterhenn s->s_fs_info = NULL; 430e1f89ec9SEric Sesterhenn return -EIO; 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); 4451da177e4SLinus Torvalds if (!(s->s_flags & MS_RDONLY)) { 446c2b513dfSAl Viro mark_buffer_dirty(info->si_sbh); 4471da177e4SLinus Torvalds s->s_dirt = 1; 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds dump_imap("read_super", s); 4503f165e4cSDmitri Vorobiev mutex_init(&info->bfs_lock); 4511da177e4SLinus Torvalds return 0; 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds out: 4541da177e4SLinus Torvalds brelse(bh); 4551da177e4SLinus Torvalds kfree(info); 4561da177e4SLinus Torvalds s->s_fs_info = NULL; 457e33ab086SDavid Howells return ret; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 460454e2398SDavid Howells static int bfs_get_sb(struct file_system_type *fs_type, 461454e2398SDavid Howells int flags, const char *dev_name, void *data, struct vfsmount *mnt) 4621da177e4SLinus Torvalds { 463454e2398SDavid Howells return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 4671da177e4SLinus Torvalds .owner = THIS_MODULE, 4681da177e4SLinus Torvalds .name = "bfs", 4691da177e4SLinus Torvalds .get_sb = bfs_get_sb, 4701da177e4SLinus Torvalds .kill_sb = kill_block_super, 4711da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4721da177e4SLinus Torvalds }; 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds static int __init init_bfs_fs(void) 4751da177e4SLinus Torvalds { 4761da177e4SLinus Torvalds int err = init_inodecache(); 4771da177e4SLinus Torvalds if (err) 4781da177e4SLinus Torvalds goto out1; 4791da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 4801da177e4SLinus Torvalds if (err) 4811da177e4SLinus Torvalds goto out; 4821da177e4SLinus Torvalds return 0; 4831da177e4SLinus Torvalds out: 4841da177e4SLinus Torvalds destroy_inodecache(); 4851da177e4SLinus Torvalds out1: 4861da177e4SLinus Torvalds return err; 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 4901da177e4SLinus Torvalds { 4911da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 4921da177e4SLinus Torvalds destroy_inodecache(); 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds module_init(init_bfs_fs) 4961da177e4SLinus Torvalds module_exit(exit_bfs_fs) 497