/* * fs/bfs/inode.c * BFS superblock and inode operations. * Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com> * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. * * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. */ #include <linux/module.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/smp_lock.h> #include <linux/buffer_head.h> #include <linux/vfs.h> #include <asm/uaccess.h> #include "bfs.h" MODULE_AUTHOR("Tigran A. Aivazian <tigran@veritas.com>"); MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); MODULE_LICENSE("GPL"); #undef DEBUG #ifdef DEBUG #define dprintf(x...) printf(x) #else #define dprintf(x...) #endif void dump_imap(const char *prefix, struct super_block * s); static void bfs_read_inode(struct inode * inode) { unsigned long ino = inode->i_ino; struct bfs_inode * di; struct buffer_head * bh; int block, off; if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); make_bad_inode(inode); return; } block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; bh = sb_bread(inode->i_sb, block); if (!bh) { printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); make_bad_inode(inode); return; } off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; di = (struct bfs_inode *)bh->b_data + off; inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { inode->i_mode |= S_IFDIR; inode->i_op = &bfs_dir_inops; inode->i_fop = &bfs_dir_operations; } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { inode->i_mode |= S_IFREG; inode->i_op = &bfs_file_inops; inode->i_fop = &bfs_file_operations; inode->i_mapping->a_ops = &bfs_aops; } BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); inode->i_uid = le32_to_cpu(di->i_uid); inode->i_gid = le32_to_cpu(di->i_gid); inode->i_nlink = le32_to_cpu(di->i_nlink); inode->i_size = BFS_FILESIZE(di); inode->i_blocks = BFS_FILEBLOCKS(di); if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks); inode->i_blksize = PAGE_SIZE; inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); inode->i_atime.tv_nsec = 0; inode->i_mtime.tv_nsec = 0; inode->i_ctime.tv_nsec = 0; BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */ brelse(bh); } static int bfs_write_inode(struct inode * inode, int unused) { unsigned int ino = (u16)inode->i_ino; unsigned long i_sblock; struct bfs_inode * di; struct buffer_head * bh; int block, off; dprintf("ino=%08x\n", ino); if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); return -EIO; } lock_kernel(); block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; bh = sb_bread(inode->i_sb, block); if (!bh) { printf("Unable to read inode %s:%08x\n", inode->i_sb->s_id, ino); unlock_kernel(); return -EIO; } off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; di = (struct bfs_inode *)bh->b_data + off; if (ino == BFS_ROOT_INO) di->i_vtype = cpu_to_le32(BFS_VDIR); else di->i_vtype = cpu_to_le32(BFS_VREG); di->i_ino = cpu_to_le16(ino); di->i_mode = cpu_to_le32(inode->i_mode); di->i_uid = cpu_to_le32(inode->i_uid); di->i_gid = cpu_to_le32(inode->i_gid); di->i_nlink = cpu_to_le32(inode->i_nlink); di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); i_sblock = BFS_I(inode)->i_sblock; di->i_sblock = cpu_to_le32(i_sblock); di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); mark_buffer_dirty(bh); dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off); brelse(bh); unlock_kernel(); return 0; } static void bfs_delete_inode(struct inode * inode) { unsigned long ino = inode->i_ino; struct bfs_inode * di; struct buffer_head * bh; int block, off; struct super_block * s = inode->i_sb; struct bfs_sb_info * info = BFS_SB(s); struct bfs_inode_info * bi = BFS_I(inode); dprintf("ino=%08lx\n", ino); truncate_inode_pages(&inode->i_data, 0); if (ino < BFS_ROOT_INO || ino > info->si_lasti) { printf("invalid ino=%08lx\n", ino); return; } inode->i_size = 0; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; lock_kernel(); mark_inode_dirty(inode); block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; bh = sb_bread(s, block); if (!bh) { printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); unlock_kernel(); return; } off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; di = (struct bfs_inode *) bh->b_data + off; if (bi->i_dsk_ino) { info->si_freeb += 1 + bi->i_eblock - bi->i_sblock; info->si_freei++; clear_bit(ino, info->si_imap); dump_imap("delete_inode", s); } di->i_ino = 0; di->i_sblock = 0; mark_buffer_dirty(bh); brelse(bh); /* if this was the last file, make the previous block "last files last block" even if there is no real file there, saves us 1 gap */ if (info->si_lf_eblk == BFS_I(inode)->i_eblock) { info->si_lf_eblk = BFS_I(inode)->i_sblock - 1; mark_buffer_dirty(info->si_sbh); } unlock_kernel(); clear_inode(inode); } static void bfs_put_super(struct super_block *s) { struct bfs_sb_info *info = BFS_SB(s); brelse(info->si_sbh); kfree(info->si_imap); kfree(info); s->s_fs_info = NULL; } static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *s = dentry->d_sb; struct bfs_sb_info *info = BFS_SB(s); u64 id = huge_encode_dev(s->s_bdev->bd_dev); buf->f_type = BFS_MAGIC; buf->f_bsize = s->s_blocksize; buf->f_blocks = info->si_blocks; buf->f_bfree = buf->f_bavail = info->si_freeb; buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; buf->f_ffree = info->si_freei; buf->f_fsid.val[0] = (u32)id; buf->f_fsid.val[1] = (u32)(id >> 32); buf->f_namelen = BFS_NAMELEN; return 0; } static void bfs_write_super(struct super_block *s) { lock_kernel(); if (!(s->s_flags & MS_RDONLY)) mark_buffer_dirty(BFS_SB(s)->si_sbh); s->s_dirt = 0; unlock_kernel(); } static kmem_cache_t * bfs_inode_cachep; static struct inode *bfs_alloc_inode(struct super_block *sb) { struct bfs_inode_info *bi; bi = kmem_cache_alloc(bfs_inode_cachep, SLAB_KERNEL); if (!bi) return NULL; return &bi->vfs_inode; } static void bfs_destroy_inode(struct inode *inode) { kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); } static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) { struct bfs_inode_info *bi = foo; if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) inode_init_once(&bi->vfs_inode); } static int init_inodecache(void) { bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", sizeof(struct bfs_inode_info), 0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), init_once, NULL); if (bfs_inode_cachep == NULL) return -ENOMEM; return 0; } static void destroy_inodecache(void) { if (kmem_cache_destroy(bfs_inode_cachep)) printk(KERN_INFO "bfs_inode_cache: not all structures were freed\n"); } static struct super_operations bfs_sops = { .alloc_inode = bfs_alloc_inode, .destroy_inode = bfs_destroy_inode, .read_inode = bfs_read_inode, .write_inode = bfs_write_inode, .delete_inode = bfs_delete_inode, .put_super = bfs_put_super, .write_super = bfs_write_super, .statfs = bfs_statfs, }; void dump_imap(const char *prefix, struct super_block * s) { #ifdef DEBUG int i; char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); if (!tmpbuf) return; for (i=BFS_SB(s)->si_lasti; i>=0; i--) { if (i > PAGE_SIZE-100) break; if (test_bit(i, BFS_SB(s)->si_imap)) strcat(tmpbuf, "1"); else strcat(tmpbuf, "0"); } printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); free_page((unsigned long)tmpbuf); #endif } static int bfs_fill_super(struct super_block *s, void *data, int silent) { struct buffer_head * bh; struct bfs_super_block * bfs_sb; struct inode * inode; unsigned i, imap_len; struct bfs_sb_info * info; info = kmalloc(sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; s->s_fs_info = info; memset(info, 0, sizeof(*info)); sb_set_blocksize(s, BFS_BSIZE); bh = sb_bread(s, 0); if(!bh) goto out; bfs_sb = (struct bfs_super_block *)bh->b_data; if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { if (!silent) printf("No BFS filesystem on %s (magic=%08x)\n", s->s_id, le32_to_cpu(bfs_sb->s_magic)); goto out; } if (BFS_UNCLEAN(bfs_sb, s) && !silent) printf("%s is unclean, continuing\n", s->s_id); s->s_magic = BFS_MAGIC; info->si_sbh = bh; info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode) + BFS_ROOT_INO - 1; imap_len = info->si_lasti/8 + 1; info->si_imap = kmalloc(imap_len, GFP_KERNEL); if (!info->si_imap) goto out; memset(info->si_imap, 0, imap_len); for (i=0; i<BFS_ROOT_INO; i++) set_bit(i, info->si_imap); s->s_op = &bfs_sops; inode = iget(s, BFS_ROOT_INO); if (!inode) { kfree(info->si_imap); goto out; } s->s_root = d_alloc_root(inode); if (!s->s_root) { iput(inode); kfree(info->si_imap); goto out; } info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */ info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS; info->si_freei = 0; info->si_lf_eblk = 0; info->si_lf_sblk = 0; info->si_lf_ioff = 0; bh = NULL; for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) { struct bfs_inode *di; int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; unsigned long sblock, eblock; if (!off) { brelse(bh); bh = sb_bread(s, block); } if (!bh) continue; di = (struct bfs_inode *)bh->b_data + off; if (!di->i_ino) { info->si_freei++; continue; } set_bit(i, info->si_imap); info->si_freeb -= BFS_FILEBLOCKS(di); sblock = le32_to_cpu(di->i_sblock); eblock = le32_to_cpu(di->i_eblock); if (eblock > info->si_lf_eblk) { info->si_lf_eblk = eblock; info->si_lf_sblk = sblock; info->si_lf_ioff = BFS_INO2OFF(i); } } brelse(bh); if (!(s->s_flags & MS_RDONLY)) { mark_buffer_dirty(info->si_sbh); s->s_dirt = 1; } dump_imap("read_super", s); return 0; out: brelse(bh); kfree(info); s->s_fs_info = NULL; return -EINVAL; } static int bfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); } static struct file_system_type bfs_fs_type = { .owner = THIS_MODULE, .name = "bfs", .get_sb = bfs_get_sb, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; static int __init init_bfs_fs(void) { int err = init_inodecache(); if (err) goto out1; err = register_filesystem(&bfs_fs_type); if (err) goto out; return 0; out: destroy_inodecache(); out1: return err; } static void __exit exit_bfs_fs(void) { unregister_filesystem(&bfs_fs_type); destroy_inodecache(); } module_init(init_bfs_fs) module_exit(exit_bfs_fs)