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
bfs_iget(struct super_block * sb,unsigned long ino)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);
85*73d9b9d0SJeff Layton inode_set_ctime(inode, le32_to_cpu(di->i_ctime), 0);
861da177e4SLinus Torvalds inode->i_atime.tv_nsec = 0;
871da177e4SLinus Torvalds inode->i_mtime.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
find_inode(struct super_block * sb,u16 ino,struct buffer_head ** p)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
bfs_write_inode(struct inode * inode,struct writeback_control * wbc)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);
145*73d9b9d0SJeff Layton di->i_ctime = cpu_to_le32(inode_get_ctime(inode).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
bfs_evict_inode(struct inode * inode)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
bfs_put_super(struct super_block * s)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
bfs_statfs(struct dentry * dentry,struct kstatfs * buf)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;
2316d1349c7SAl Viro buf->f_fsid = u64_to_fsid(id);
2321da177e4SLinus Torvalds buf->f_namelen = BFS_NAMELEN;
2331da177e4SLinus Torvalds return 0;
2341da177e4SLinus Torvalds }
2351da177e4SLinus Torvalds
236e18b890bSChristoph Lameter static struct kmem_cache *bfs_inode_cachep;
2371da177e4SLinus Torvalds
bfs_alloc_inode(struct super_block * sb)2381da177e4SLinus Torvalds static struct inode *bfs_alloc_inode(struct super_block *sb)
2391da177e4SLinus Torvalds {
2401da177e4SLinus Torvalds struct bfs_inode_info *bi;
241fd60b288SMuchun Song bi = alloc_inode_sb(sb, bfs_inode_cachep, GFP_KERNEL);
2421da177e4SLinus Torvalds if (!bi)
2431da177e4SLinus Torvalds return NULL;
2441da177e4SLinus Torvalds return &bi->vfs_inode;
2451da177e4SLinus Torvalds }
2461da177e4SLinus Torvalds
bfs_free_inode(struct inode * inode)2478d8fc9cbSAl Viro static void bfs_free_inode(struct inode *inode)
248fa0d7e3dSNick Piggin {
249fa0d7e3dSNick Piggin kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
250fa0d7e3dSNick Piggin }
251fa0d7e3dSNick Piggin
init_once(void * foo)25251cc5068SAlexey Dobriyan static void init_once(void *foo)
2531da177e4SLinus Torvalds {
2541da177e4SLinus Torvalds struct bfs_inode_info *bi = foo;
2551da177e4SLinus Torvalds
2561da177e4SLinus Torvalds inode_init_once(&bi->vfs_inode);
2571da177e4SLinus Torvalds }
2581da177e4SLinus Torvalds
init_inodecache(void)259758b4440SFabian Frederick static int __init init_inodecache(void)
2601da177e4SLinus Torvalds {
2611da177e4SLinus Torvalds bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
2621da177e4SLinus Torvalds sizeof(struct bfs_inode_info),
263fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT|
2645d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT),
26520c2df83SPaul Mundt init_once);
2661da177e4SLinus Torvalds if (bfs_inode_cachep == NULL)
2671da177e4SLinus Torvalds return -ENOMEM;
2681da177e4SLinus Torvalds return 0;
2691da177e4SLinus Torvalds }
2701da177e4SLinus Torvalds
destroy_inodecache(void)2711da177e4SLinus Torvalds static void destroy_inodecache(void)
2721da177e4SLinus Torvalds {
2738c0a8537SKirill A. Shutemov /*
2748c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we
2758c0a8537SKirill A. Shutemov * destroy cache.
2768c0a8537SKirill A. Shutemov */
2778c0a8537SKirill A. Shutemov rcu_barrier();
2781a1d92c1SAlexey Dobriyan kmem_cache_destroy(bfs_inode_cachep);
2791da177e4SLinus Torvalds }
2801da177e4SLinus Torvalds
281ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations bfs_sops = {
2821da177e4SLinus Torvalds .alloc_inode = bfs_alloc_inode,
2838d8fc9cbSAl Viro .free_inode = bfs_free_inode,
2841da177e4SLinus Torvalds .write_inode = bfs_write_inode,
2859df2f851SAl Viro .evict_inode = bfs_evict_inode,
2861da177e4SLinus Torvalds .put_super = bfs_put_super,
2871da177e4SLinus Torvalds .statfs = bfs_statfs,
2881da177e4SLinus Torvalds };
2891da177e4SLinus Torvalds
bfs_dump_imap(const char * prefix,struct super_block * s)2901da85fdfSFabian Frederick void bfs_dump_imap(const char *prefix, struct super_block *s)
2911da177e4SLinus Torvalds {
292fac92becSAndrew Stribblehill #ifdef DEBUG
2931da177e4SLinus Torvalds int i;
2941da177e4SLinus Torvalds char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
2951da177e4SLinus Torvalds
2961da177e4SLinus Torvalds if (!tmpbuf)
2971da177e4SLinus Torvalds return;
2981da177e4SLinus Torvalds for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
2991da177e4SLinus Torvalds if (i > PAGE_SIZE - 100) break;
3001da177e4SLinus Torvalds if (test_bit(i, BFS_SB(s)->si_imap))
3011da177e4SLinus Torvalds strcat(tmpbuf, "1");
3021da177e4SLinus Torvalds else
3031da177e4SLinus Torvalds strcat(tmpbuf, "0");
3041da177e4SLinus Torvalds }
305d1877155STigran Aivazian printf("%s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf);
3061da177e4SLinus Torvalds free_page((unsigned long)tmpbuf);
3071da177e4SLinus Torvalds #endif
3081da177e4SLinus Torvalds }
3091da177e4SLinus Torvalds
bfs_fill_super(struct super_block * s,void * data,int silent)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;
315d1877155STigran Aivazian unsigned i;
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;
32522b13969SDeepa Dinamani s->s_time_min = 0;
32622b13969SDeepa Dinamani s->s_time_max = U32_MAX;
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)
352dc889b8dSRandy Dunlap printf("NOTE: 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
bfs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)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
init_bfs_fs(void)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
exit_bfs_fs(void)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