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fs/bfs/inode.c
11.1 KB
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/* * fs/bfs/inode.c * BFS superblock and inode operations. |
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* Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> |
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* From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. |
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* * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. |
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*/ #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" |
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MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); |
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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 ", 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 ", 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; |
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inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { |
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inode->i_mode |= S_IFDIR; inode->i_op = &bfs_dir_inops; inode->i_fop = &bfs_dir_operations; |
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} else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { |
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inode->i_mode |= S_IFREG; inode->i_op = &bfs_file_inops; inode->i_fop = &bfs_file_operations; inode->i_mapping->a_ops = &bfs_aops; } |
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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); |
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inode->i_size = BFS_FILESIZE(di); inode->i_blocks = BFS_FILEBLOCKS(di); |
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if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks ", inode->i_size, inode->i_blocks); |
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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); |
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inode->i_atime.tv_nsec = 0; inode->i_mtime.tv_nsec = 0; inode->i_ctime.tv_nsec = 0; |
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BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */ |
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brelse(bh); } static int bfs_write_inode(struct inode * inode, int unused) { |
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unsigned int ino = (u16)inode->i_ino; unsigned long i_sblock; |
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struct bfs_inode * di; struct buffer_head * bh; int block, off; |
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dprintf("ino=%08x ", ino); |
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if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { |
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printf("Bad inode number %s:%08x ", inode->i_sb->s_id, ino); |
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return -EIO; } lock_kernel(); block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; bh = sb_bread(inode->i_sb, block); if (!bh) { |
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printf("Unable to read inode %s:%08x ", inode->i_sb->s_id, ino); |
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unlock_kernel(); return -EIO; } off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; di = (struct bfs_inode *)bh->b_data + off; |
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if (ino == BFS_ROOT_INO) di->i_vtype = cpu_to_le32(BFS_VDIR); |
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else |
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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); |
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mark_buffer_dirty(bh); |
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dprintf("Written ino=%d into %d:%d ",le16_to_cpu(di->i_ino),block,off); |
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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); |
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struct bfs_inode_info * bi = BFS_I(inode); |
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dprintf("ino=%08lx ", ino); |
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truncate_inode_pages(&inode->i_data, 0); |
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if (ino < BFS_ROOT_INO || ino > info->si_lasti) { printf("invalid ino=%08lx ", ino); |
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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 ", inode->i_sb->s_id, ino); unlock_kernel(); return; } off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; |
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di = (struct bfs_inode *) bh->b_data + off; if (bi->i_dsk_ino) { info->si_freeb += 1 + bi->i_eblock - bi->i_sblock; |
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info->si_freei++; |
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clear_bit(ino, info->si_imap); |
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dump_imap("delete_inode", s); |
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} |
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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; } |
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static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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struct super_block *s = dentry->d_sb; |
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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(); } |
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static struct kmem_cache * bfs_inode_cachep; |
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static struct inode *bfs_alloc_inode(struct super_block *sb) { struct bfs_inode_info *bi; |
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bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); |
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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)); } |
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static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
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{ struct bfs_inode_info *bi = foo; |
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inode_init_once(&bi->vfs_inode); |
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} |
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static int init_inodecache(void) { bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", sizeof(struct bfs_inode_info), |
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0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), |
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init_once); |
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if (bfs_inode_cachep == NULL) return -ENOMEM; return 0; } static void destroy_inodecache(void) { |
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kmem_cache_destroy(bfs_inode_cachep); |
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} |
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static const struct super_operations bfs_sops = { |
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.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) { |
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#ifdef DEBUG |
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int i; char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); if (!tmpbuf) return; for (i=BFS_SB(s)->si_lasti; i>=0; i--) { |
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if (i > PAGE_SIZE-100) break; |
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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> ", 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; |
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unsigned i, imap_len; |
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struct bfs_sb_info * info; |
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info = kzalloc(sizeof(*info), GFP_KERNEL); |
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if (!info) return -ENOMEM; s->s_fs_info = info; |
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sb_set_blocksize(s, BFS_BSIZE); bh = sb_bread(s, 0); if(!bh) goto out; bfs_sb = (struct bfs_super_block *)bh->b_data; |
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if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { |
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if (!silent) printf("No BFS filesystem on %s (magic=%08x) ", |
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s->s_id, le32_to_cpu(bfs_sb->s_magic)); |
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goto out; } if (BFS_UNCLEAN(bfs_sb, s) && !silent) printf("%s is unclean, continuing ", s->s_id); s->s_magic = BFS_MAGIC; |
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info->si_sbh = bh; |
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info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode) |
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+ BFS_ROOT_INO - 1; imap_len = info->si_lasti/8 + 1; |
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info->si_imap = kzalloc(imap_len, GFP_KERNEL); |
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if (!info->si_imap) goto out; |
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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; } |
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info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */ |
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info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS; |
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info->si_freei = 0; info->si_lf_eblk = 0; info->si_lf_sblk = 0; info->si_lf_ioff = 0; |
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bh = NULL; |
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for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) { |
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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) { |
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info->si_freei++; |
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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); |
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} |
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} |
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brelse(bh); |
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if (!(s->s_flags & MS_RDONLY)) { |
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mark_buffer_dirty(info->si_sbh); |
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s->s_dirt = 1; } dump_imap("read_super", s); return 0; out: brelse(bh); kfree(info); s->s_fs_info = NULL; return -EINVAL; } |
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static int bfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
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{ |
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return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); |
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} 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) |