109c434b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * fs/bfs/inode.c 41da177e4SLinus Torvalds * BFS superblock and inode operations. 5d1877155STigran Aivazian * Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com> 61da177e4SLinus Torvalds * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. 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> 18e2e40f2cSChristoph Hellwig #include <linux/uio.h> 197c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 201da177e4SLinus Torvalds #include "bfs.h" 211da177e4SLinus Torvalds 22cea58224SAndrew Morton MODULE_AUTHOR("Tigran Aivazian <aivazian.tigran@gmail.com>"); 231da177e4SLinus Torvalds MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); 241da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #undef DEBUG 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #ifdef DEBUG 291da177e4SLinus Torvalds #define dprintf(x...) printf(x) 301da177e4SLinus Torvalds #else 311da177e4SLinus Torvalds #define dprintf(x...) 321da177e4SLinus Torvalds #endif 331da177e4SLinus Torvalds 34e33ab086SDavid Howells struct inode *bfs_iget(struct super_block *sb, unsigned long ino) 351da177e4SLinus Torvalds { 361da177e4SLinus Torvalds struct bfs_inode *di; 37e33ab086SDavid Howells struct inode *inode; 381da177e4SLinus Torvalds struct buffer_head *bh; 391da177e4SLinus Torvalds int block, off; 401da177e4SLinus Torvalds 41e33ab086SDavid Howells inode = iget_locked(sb, ino); 42821ff77cSDan Carpenter if (!inode) 43e33ab086SDavid Howells return ERR_PTR(-ENOMEM); 44e33ab086SDavid Howells if (!(inode->i_state & I_NEW)) 45e33ab086SDavid Howells return inode; 46e33ab086SDavid Howells 47f433dc56SDmitri Vorobiev if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 481da177e4SLinus Torvalds printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); 49e33ab086SDavid Howells goto error; 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 531da177e4SLinus Torvalds bh = sb_bread(inode->i_sb, block); 541da177e4SLinus Torvalds if (!bh) { 55f433dc56SDmitri Vorobiev printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, 56f433dc56SDmitri Vorobiev ino); 57e33ab086SDavid Howells goto error; 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 611da177e4SLinus Torvalds di = (struct bfs_inode *)bh->b_data + off; 621da177e4SLinus Torvalds 63fac92becSAndrew Stribblehill inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 64fac92becSAndrew Stribblehill if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 651da177e4SLinus Torvalds inode->i_mode |= S_IFDIR; 661da177e4SLinus Torvalds inode->i_op = &bfs_dir_inops; 671da177e4SLinus Torvalds inode->i_fop = &bfs_dir_operations; 68fac92becSAndrew Stribblehill } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 691da177e4SLinus Torvalds inode->i_mode |= S_IFREG; 701da177e4SLinus Torvalds inode->i_op = &bfs_file_inops; 711da177e4SLinus Torvalds inode->i_fop = &bfs_file_operations; 721da177e4SLinus Torvalds inode->i_mapping->a_ops = &bfs_aops; 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 75fac92becSAndrew Stribblehill BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 76fac92becSAndrew Stribblehill BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 77f433dc56SDmitri Vorobiev BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); 787f5b82b8SEric W. Biederman i_uid_write(inode, le32_to_cpu(di->i_uid)); 797f5b82b8SEric W. Biederman i_gid_write(inode, le32_to_cpu(di->i_gid)); 80bfe86848SMiklos Szeredi set_nlink(inode, le32_to_cpu(di->i_nlink)); 811da177e4SLinus Torvalds inode->i_size = BFS_FILESIZE(di); 821da177e4SLinus Torvalds inode->i_blocks = BFS_FILEBLOCKS(di); 83fac92becSAndrew Stribblehill inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 84fac92becSAndrew Stribblehill inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 85fac92becSAndrew Stribblehill inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 861da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0; 871da177e4SLinus Torvalds inode->i_mtime.tv_nsec = 0; 881da177e4SLinus Torvalds inode->i_ctime.tv_nsec = 0; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds brelse(bh); 91e33ab086SDavid Howells unlock_new_inode(inode); 92e33ab086SDavid Howells return inode; 93e33ab086SDavid Howells 94e33ab086SDavid Howells error: 95e33ab086SDavid Howells iget_failed(inode); 96e33ab086SDavid Howells return ERR_PTR(-EIO); 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 999df2f851SAl Viro static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p) 1009df2f851SAl Viro { 1019df2f851SAl Viro if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) { 1029df2f851SAl Viro printf("Bad inode number %s:%08x\n", sb->s_id, ino); 1039df2f851SAl Viro return ERR_PTR(-EIO); 1049df2f851SAl Viro } 1059df2f851SAl Viro 1069df2f851SAl Viro ino -= BFS_ROOT_INO; 1079df2f851SAl Viro 1089df2f851SAl Viro *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK); 1099df2f851SAl Viro if (!*p) { 1109df2f851SAl Viro printf("Unable to read inode %s:%08x\n", sb->s_id, ino); 1119df2f851SAl Viro return ERR_PTR(-EIO); 1129df2f851SAl Viro } 1139df2f851SAl Viro 1149df2f851SAl Viro return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK; 1159df2f851SAl Viro } 1169df2f851SAl Viro 117a9185b41SChristoph Hellwig static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) 1181da177e4SLinus Torvalds { 1194427f0c3SAl Viro struct bfs_sb_info *info = BFS_SB(inode->i_sb); 120fac92becSAndrew Stribblehill unsigned int ino = (u16)inode->i_ino; 121fac92becSAndrew Stribblehill unsigned long i_sblock; 1221da177e4SLinus Torvalds struct bfs_inode *di; 1231da177e4SLinus Torvalds struct buffer_head *bh; 1244427f0c3SAl Viro int err = 0; 1251da177e4SLinus Torvalds 126fac92becSAndrew Stribblehill dprintf("ino=%08x\n", ino); 127fac92becSAndrew Stribblehill 1289df2f851SAl Viro di = find_inode(inode->i_sb, ino, &bh); 1299df2f851SAl Viro if (IS_ERR(di)) 1309df2f851SAl Viro return PTR_ERR(di); 1311da177e4SLinus Torvalds 1323f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1331da177e4SLinus Torvalds 134fac92becSAndrew Stribblehill if (ino == BFS_ROOT_INO) 135fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VDIR); 1361da177e4SLinus Torvalds else 137fac92becSAndrew Stribblehill di->i_vtype = cpu_to_le32(BFS_VREG); 1381da177e4SLinus Torvalds 139fac92becSAndrew Stribblehill di->i_ino = cpu_to_le16(ino); 140fac92becSAndrew Stribblehill di->i_mode = cpu_to_le32(inode->i_mode); 1417f5b82b8SEric W. Biederman di->i_uid = cpu_to_le32(i_uid_read(inode)); 1427f5b82b8SEric W. Biederman di->i_gid = cpu_to_le32(i_gid_read(inode)); 143fac92becSAndrew Stribblehill di->i_nlink = cpu_to_le32(inode->i_nlink); 144fac92becSAndrew Stribblehill di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 145fac92becSAndrew Stribblehill di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 146fac92becSAndrew Stribblehill di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 147fac92becSAndrew Stribblehill i_sblock = BFS_I(inode)->i_sblock; 148fac92becSAndrew Stribblehill di->i_sblock = cpu_to_le32(i_sblock); 149fac92becSAndrew Stribblehill di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 150fac92becSAndrew Stribblehill di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds mark_buffer_dirty(bh); 153a9185b41SChristoph Hellwig if (wbc->sync_mode == WB_SYNC_ALL) { 1544427f0c3SAl Viro sync_dirty_buffer(bh); 1554427f0c3SAl Viro if (buffer_req(bh) && !buffer_uptodate(bh)) 1564427f0c3SAl Viro err = -EIO; 1574427f0c3SAl Viro } 1581da177e4SLinus Torvalds brelse(bh); 1593f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 1604427f0c3SAl Viro return err; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 1639df2f851SAl Viro static void bfs_evict_inode(struct inode *inode) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds unsigned long ino = inode->i_ino; 1661da177e4SLinus Torvalds struct bfs_inode *di; 1671da177e4SLinus Torvalds struct buffer_head *bh; 1681da177e4SLinus Torvalds struct super_block *s = inode->i_sb; 1691da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 170fac92becSAndrew Stribblehill struct bfs_inode_info *bi = BFS_I(inode); 1711da177e4SLinus Torvalds 172fac92becSAndrew Stribblehill dprintf("ino=%08lx\n", ino); 1731da177e4SLinus Torvalds 17491b0abe3SJohannes Weiner truncate_inode_pages_final(&inode->i_data); 1759df2f851SAl Viro invalidate_inode_buffers(inode); 176dbd5768fSJan Kara clear_inode(inode); 177fef26658SMark Fasheh 1789df2f851SAl Viro if (inode->i_nlink) 1791da177e4SLinus Torvalds return; 1801da177e4SLinus Torvalds 1819df2f851SAl Viro di = find_inode(s, inode->i_ino, &bh); 1829df2f851SAl Viro if (IS_ERR(di)) 1839df2f851SAl Viro return; 1849df2f851SAl Viro 1853f165e4cSDmitri Vorobiev mutex_lock(&info->bfs_lock); 1869df2f851SAl Viro /* clear on-disk inode */ 1879df2f851SAl Viro memset(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); 196d1877155STigran Aivazian bfs_dump_imap("evict_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 */ 2044e29d50aSArtem Bityutskiy if (info->si_lf_eblk == bi->i_eblock) 205f433dc56SDmitri Vorobiev info->si_lf_eblk = bi->i_sblock - 1; 2063f165e4cSDmitri Vorobiev mutex_unlock(&info->bfs_lock); 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds static void bfs_put_super(struct super_block *s) 2101da177e4SLinus Torvalds { 2111da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2123f165e4cSDmitri Vorobiev 213e1f89ec9SEric Sesterhenn if (!info) 214e1f89ec9SEric Sesterhenn return; 215e1f89ec9SEric Sesterhenn 2163f165e4cSDmitri Vorobiev mutex_destroy(&info->bfs_lock); 2171da177e4SLinus Torvalds kfree(info); 2181da177e4SLinus Torvalds s->s_fs_info = NULL; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 221726c3342SDavid Howells static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2221da177e4SLinus Torvalds { 223726c3342SDavid Howells struct super_block *s = dentry->d_sb; 2241da177e4SLinus Torvalds struct bfs_sb_info *info = BFS_SB(s); 2251da177e4SLinus Torvalds u64 id = huge_encode_dev(s->s_bdev->bd_dev); 2261da177e4SLinus Torvalds buf->f_type = BFS_MAGIC; 2271da177e4SLinus Torvalds buf->f_bsize = s->s_blocksize; 2281da177e4SLinus Torvalds buf->f_blocks = info->si_blocks; 2291da177e4SLinus Torvalds buf->f_bfree = buf->f_bavail = info->si_freeb; 2301da177e4SLinus Torvalds buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 2311da177e4SLinus Torvalds buf->f_ffree = info->si_freei; 2321da177e4SLinus Torvalds buf->f_fsid.val[0] = (u32)id; 2331da177e4SLinus Torvalds buf->f_fsid.val[1] = (u32)(id >> 32); 2341da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN; 2351da177e4SLinus Torvalds return 0; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds 238e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds struct bfs_inode_info *bi; 243e94b1766SChristoph Lameter bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 2441da177e4SLinus Torvalds if (!bi) 2451da177e4SLinus Torvalds return NULL; 2461da177e4SLinus Torvalds return &bi->vfs_inode; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 2498d8fc9cbSAl Viro static void bfs_free_inode(struct inode *inode) 250fa0d7e3dSNick Piggin { 251fa0d7e3dSNick Piggin kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 252fa0d7e3dSNick Piggin } 253fa0d7e3dSNick Piggin 25451cc5068SAlexey Dobriyan static void init_once(void *foo) 2551da177e4SLinus Torvalds { 2561da177e4SLinus Torvalds struct bfs_inode_info *bi = foo; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode); 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 261758b4440SFabian Frederick static int __init init_inodecache(void) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 2641da177e4SLinus Torvalds sizeof(struct bfs_inode_info), 265fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 2665d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT), 26720c2df83SPaul Mundt init_once); 2681da177e4SLinus Torvalds if (bfs_inode_cachep == NULL) 2691da177e4SLinus Torvalds return -ENOMEM; 2701da177e4SLinus Torvalds return 0; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds static void destroy_inodecache(void) 2741da177e4SLinus Torvalds { 2758c0a8537SKirill A. Shutemov /* 2768c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 2778c0a8537SKirill A. Shutemov * destroy cache. 2788c0a8537SKirill A. Shutemov */ 2798c0a8537SKirill A. Shutemov rcu_barrier(); 2801a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep); 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 283ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = { 2841da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode, 2858d8fc9cbSAl Viro .free_inode = bfs_free_inode, 2861da177e4SLinus Torvalds .write_inode = bfs_write_inode, 2879df2f851SAl Viro .evict_inode = bfs_evict_inode, 2881da177e4SLinus Torvalds .put_super = bfs_put_super, 2891da177e4SLinus Torvalds .statfs = bfs_statfs, 2901da177e4SLinus Torvalds }; 2911da177e4SLinus Torvalds 2921da85fdfSFabian Frederick void bfs_dump_imap(const char *prefix, struct super_block *s) 2931da177e4SLinus Torvalds { 294fac92becSAndrew Stribblehill #ifdef DEBUG 2951da177e4SLinus Torvalds int i; 2961da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds if (!tmpbuf) 2991da177e4SLinus Torvalds return; 3001da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 3011da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break; 3021da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap)) 3031da177e4SLinus Torvalds strcat(tmpbuf, "1"); 3041da177e4SLinus Torvalds else 3051da177e4SLinus Torvalds strcat(tmpbuf, "0"); 3061da177e4SLinus Torvalds } 307d1877155STigran Aivazian printf("%s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); 3081da177e4SLinus Torvalds free_page((unsigned long)tmpbuf); 3091da177e4SLinus Torvalds #endif 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds static int bfs_fill_super(struct super_block *s, void *data, int silent) 3131da177e4SLinus Torvalds { 3144e29d50aSArtem Bityutskiy struct buffer_head *bh, *sbh; 3151da177e4SLinus Torvalds struct bfs_super_block *bfs_sb; 3161da177e4SLinus Torvalds struct inode *inode; 317d1877155STigran Aivazian unsigned i; 3181da177e4SLinus Torvalds struct bfs_sb_info *info; 3195998649fSAl Viro int ret = -EINVAL; 320e1f89ec9SEric Sesterhenn unsigned long i_sblock, i_eblock, i_eoff, s_size; 3211da177e4SLinus Torvalds 322f8314dc6SPanagiotis Issaris info = kzalloc(sizeof(*info), GFP_KERNEL); 323ba13d597SJan Blunck if (!info) 3241da177e4SLinus Torvalds return -ENOMEM; 3255998649fSAl Viro mutex_init(&info->bfs_lock); 3261da177e4SLinus Torvalds s->s_fs_info = info; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds sb_set_blocksize(s, BFS_BSIZE); 3291da177e4SLinus Torvalds 3304e29d50aSArtem Bityutskiy sbh = sb_bread(s, 0); 3314e29d50aSArtem Bityutskiy if (!sbh) 3321da177e4SLinus Torvalds goto out; 3334e29d50aSArtem Bityutskiy bfs_sb = (struct bfs_super_block *)sbh->b_data; 334fac92becSAndrew Stribblehill if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 3351da177e4SLinus Torvalds if (!silent) 336d1877155STigran Aivazian printf("No BFS filesystem on %s (magic=%08x)\n", s->s_id, le32_to_cpu(bfs_sb->s_magic)); 3375998649fSAl Viro goto out1; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds if (BFS_UNCLEAN(bfs_sb, s) && !silent) 3401da177e4SLinus Torvalds printf("%s is unclean, continuing\n", s->s_id); 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds s->s_magic = BFS_MAGIC; 343e1f89ec9SEric Sesterhenn 3449f2df09aSTetsuo Handa if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end) || 345d1877155STigran Aivazian le32_to_cpu(bfs_sb->s_start) < sizeof(struct bfs_super_block) + sizeof(struct bfs_dirent)) { 346d1877155STigran Aivazian printf("Superblock is corrupted on %s\n", s->s_id); 3475998649fSAl Viro goto out1; 348e1f89ec9SEric Sesterhenn } 349e1f89ec9SEric Sesterhenn 350d1877155STigran Aivazian info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / sizeof(struct bfs_inode) + BFS_ROOT_INO - 1; 351d1877155STigran Aivazian if (info->si_lasti == BFS_MAX_LASTI) 352d1877155STigran Aivazian printf("WARNING: filesystem %s was created with 512 inodes, the real maximum is 511, mounting anyway\n", s->s_id); 353d1877155STigran Aivazian else if (info->si_lasti > BFS_MAX_LASTI) { 354d1877155STigran Aivazian printf("Impossible last inode number %lu > %d on %s\n", info->si_lasti, BFS_MAX_LASTI, s->s_id); 3555998649fSAl Viro goto out1; 3569f2df09aSTetsuo Handa } 3571da177e4SLinus Torvalds for (i = 0; i < BFS_ROOT_INO; i++) 3581da177e4SLinus Torvalds set_bit(i, info->si_imap); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds s->s_op = &bfs_sops; 361e33ab086SDavid Howells inode = bfs_iget(s, BFS_ROOT_INO); 362e33ab086SDavid Howells if (IS_ERR(inode)) { 363e33ab086SDavid Howells ret = PTR_ERR(inode); 364d1877155STigran Aivazian goto out1; 3651da177e4SLinus Torvalds } 36648fde701SAl Viro s->s_root = d_make_root(inode); 3671da177e4SLinus Torvalds if (!s->s_root) { 368e33ab086SDavid Howells ret = -ENOMEM; 369d1877155STigran Aivazian goto out1; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 372f433dc56SDmitri Vorobiev info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 373d1877155STigran Aivazian info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - 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) { 380d1877155STigran Aivazian printf("Last block not available on %s: %lu\n", s->s_id, info->si_blocks - 1); 38150682bb4SEric Sesterhenn ret = -EIO; 382d1877155STigran Aivazian goto out2; 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 || 4135f9f48f5SRakesh Pandit (i_eoff != le32_to_cpu(-1) && i_eoff > s_size) || 414e1f89ec9SEric Sesterhenn i_sblock * BFS_BSIZE > i_eoff) { 415e1f89ec9SEric Sesterhenn 416d1877155STigran Aivazian printf("Inode 0x%08x corrupted on %s\n", i, s->s_id); 417e1f89ec9SEric Sesterhenn 418e1f89ec9SEric Sesterhenn brelse(bh); 4195998649fSAl Viro ret = -EIO; 420d1877155STigran Aivazian goto out2; 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); 436d1877155STigran Aivazian bfs_dump_imap("fill_super", s); 4371da177e4SLinus Torvalds return 0; 4381da177e4SLinus Torvalds 439d1877155STigran Aivazian out2: 4405998649fSAl Viro dput(s->s_root); 4415998649fSAl Viro s->s_root = NULL; 4425998649fSAl Viro out1: 4434e29d50aSArtem Bityutskiy brelse(sbh); 4441da177e4SLinus Torvalds out: 4455998649fSAl Viro mutex_destroy(&info->bfs_lock); 4461da177e4SLinus Torvalds kfree(info); 4471da177e4SLinus Torvalds s->s_fs_info = NULL; 448e33ab086SDavid Howells return ret; 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 451152a0836SAl Viro static struct dentry *bfs_mount(struct file_system_type *fs_type, 452152a0836SAl Viro int flags, const char *dev_name, void *data) 4531da177e4SLinus Torvalds { 454152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super); 4551da177e4SLinus Torvalds } 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds static struct file_system_type bfs_fs_type = { 4581da177e4SLinus Torvalds .owner = THIS_MODULE, 4591da177e4SLinus Torvalds .name = "bfs", 460152a0836SAl Viro .mount = bfs_mount, 4611da177e4SLinus Torvalds .kill_sb = kill_block_super, 4621da177e4SLinus Torvalds .fs_flags = FS_REQUIRES_DEV, 4631da177e4SLinus Torvalds }; 4647f78e035SEric W. Biederman MODULE_ALIAS_FS("bfs"); 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds static int __init init_bfs_fs(void) 4671da177e4SLinus Torvalds { 4681da177e4SLinus Torvalds int err = init_inodecache(); 4691da177e4SLinus Torvalds if (err) 4701da177e4SLinus Torvalds goto out1; 4711da177e4SLinus Torvalds err = register_filesystem(&bfs_fs_type); 4721da177e4SLinus Torvalds if (err) 4731da177e4SLinus Torvalds goto out; 4741da177e4SLinus Torvalds return 0; 4751da177e4SLinus Torvalds out: 4761da177e4SLinus Torvalds destroy_inodecache(); 4771da177e4SLinus Torvalds out1: 4781da177e4SLinus Torvalds return err; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds static void __exit exit_bfs_fs(void) 4821da177e4SLinus Torvalds { 4831da177e4SLinus Torvalds unregister_filesystem(&bfs_fs_type); 4841da177e4SLinus Torvalds destroy_inodecache(); 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds module_init(init_bfs_fs) 4881da177e4SLinus Torvalds module_exit(exit_bfs_fs) 489