--- /dev/null
+/*
+ * fs/bfs/inode.c
+ * BFS superblock and inode operations.
+ * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
+ * 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/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/writeback.h>
+#include <linux/uio.h>
+#include <asm/uaccess.h>
+#include "bfs.h"
+
+MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
+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
+
+struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
+{
+ struct bfs_inode *di;
+ struct inode *inode;
+ struct buffer_head *bh;
+ int block, off;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ 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);
+ goto error;
+ }
+
+ 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);
+ goto error;
+ }
+
+ 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);
+ BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
+ i_uid_write(inode, le32_to_cpu(di->i_uid));
+ i_gid_write(inode, le32_to_cpu(di->i_gid));
+ set_nlink(inode, le32_to_cpu(di->i_nlink));
+ inode->i_size = BFS_FILESIZE(di);
+ inode->i_blocks = BFS_FILEBLOCKS(di);
+ 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;
+
+ brelse(bh);
+ unlock_new_inode(inode);
+ return inode;
+
+error:
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
+}
+
+static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p)
+{
+ if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) {
+ printf("Bad inode number %s:%08x\n", sb->s_id, ino);
+ return ERR_PTR(-EIO);
+ }
+
+ ino -= BFS_ROOT_INO;
+
+ *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK);
+ if (!*p) {
+ printf("Unable to read inode %s:%08x\n", sb->s_id, ino);
+ return ERR_PTR(-EIO);
+ }
+
+ return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK;
+}
+
+static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ struct bfs_sb_info *info = BFS_SB(inode->i_sb);
+ unsigned int ino = (u16)inode->i_ino;
+ unsigned long i_sblock;
+ struct bfs_inode *di;
+ struct buffer_head *bh;
+ int err = 0;
+
+ dprintf("ino=%08x\n", ino);
+
+ di = find_inode(inode->i_sb, ino, &bh);
+ if (IS_ERR(di))
+ return PTR_ERR(di);
+
+ mutex_lock(&info->bfs_lock);
+
+ 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(i_uid_read(inode));
+ di->i_gid = cpu_to_le32(i_gid_read(inode));
+ 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);
+ if (wbc->sync_mode == WB_SYNC_ALL) {
+ sync_dirty_buffer(bh);
+ if (buffer_req(bh) && !buffer_uptodate(bh))
+ err = -EIO;
+ }
+ brelse(bh);
+ mutex_unlock(&info->bfs_lock);
+ return err;
+}
+
+static void bfs_evict_inode(struct inode *inode)
+{
+ unsigned long ino = inode->i_ino;
+ struct bfs_inode *di;
+ struct buffer_head *bh;
+ 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_final(&inode->i_data);
+ invalidate_inode_buffers(inode);
+ clear_inode(inode);
+
+ if (inode->i_nlink)
+ return;
+
+ di = find_inode(s, inode->i_ino, &bh);
+ if (IS_ERR(di))
+ return;
+
+ mutex_lock(&info->bfs_lock);
+ /* clear on-disk inode */
+ memset(di, 0, sizeof(struct bfs_inode));
+ mark_buffer_dirty(bh);
+ brelse(bh);
+
+ if (bi->i_dsk_ino) {
+ if (bi->i_sblock)
+ info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
+ info->si_freei++;
+ clear_bit(ino, info->si_imap);
+ bfs_dump_imap("delete_inode", s);
+ }
+
+ /*
+ * If this was the last file, make the previous block
+ * "last block of the last file" even if there is no
+ * real file there, saves us 1 gap.
+ */
+ if (info->si_lf_eblk == bi->i_eblock)
+ info->si_lf_eblk = bi->i_sblock - 1;
+ mutex_unlock(&info->bfs_lock);
+}
+
+static void bfs_put_super(struct super_block *s)
+{
+ struct bfs_sb_info *info = BFS_SB(s);
+
+ if (!info)
+ return;
+
+ mutex_destroy(&info->bfs_lock);
+ 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 struct kmem_cache *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, GFP_KERNEL);
+ if (!bi)
+ return NULL;
+ return &bi->vfs_inode;
+}
+
+static void bfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
+}
+
+static void bfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, bfs_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct bfs_inode_info *bi = foo;
+
+ inode_init_once(&bi->vfs_inode);
+}
+
+static int __init 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);
+ if (bfs_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(bfs_inode_cachep);
+}
+
+static const struct super_operations bfs_sops = {
+ .alloc_inode = bfs_alloc_inode,
+ .destroy_inode = bfs_destroy_inode,
+ .write_inode = bfs_write_inode,
+ .evict_inode = bfs_evict_inode,
+ .put_super = bfs_put_super,
+ .statfs = bfs_statfs,
+};
+
+void bfs_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");
+ }
+ printf("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, *sbh;
+ struct bfs_super_block *bfs_sb;
+ struct inode *inode;
+ unsigned i, imap_len;
+ struct bfs_sb_info *info;
+ int ret = -EINVAL;
+ unsigned long i_sblock, i_eblock, i_eoff, s_size;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ mutex_init(&info->bfs_lock);
+ s->s_fs_info = info;
+
+ sb_set_blocksize(s, BFS_BSIZE);
+
+ sbh = sb_bread(s, 0);
+ if (!sbh)
+ goto out;
+ bfs_sb = (struct bfs_super_block *)sbh->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 out1;
+ }
+ if (BFS_UNCLEAN(bfs_sb, s) && !silent)
+ printf("%s is unclean, continuing\n", s->s_id);
+
+ s->s_magic = BFS_MAGIC;
+
+ if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
+ printf("Superblock is corrupted\n");
+ goto out1;
+ }
+
+ 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 = kzalloc(imap_len, GFP_KERNEL);
+ if (!info->si_imap)
+ goto out1;
+ for (i = 0; i < BFS_ROOT_INO; i++)
+ set_bit(i, info->si_imap);
+
+ s->s_op = &bfs_sops;
+ inode = bfs_iget(s, BFS_ROOT_INO);
+ if (IS_ERR(inode)) {
+ ret = PTR_ERR(inode);
+ goto out2;
+ }
+ s->s_root = d_make_root(inode);
+ if (!s->s_root) {
+ ret = -ENOMEM;
+ goto out2;
+ }
+
+ info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
+ 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;
+
+ /* can we read the last block? */
+ bh = sb_bread(s, info->si_blocks - 1);
+ if (!bh) {
+ printf("Last block not available: %lu\n", info->si_blocks - 1);
+ ret = -EIO;
+ goto out3;
+ }
+ brelse(bh);
+
+ 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 eblock;
+
+ if (!off) {
+ brelse(bh);
+ bh = sb_bread(s, block);
+ }
+
+ if (!bh)
+ continue;
+
+ di = (struct bfs_inode *)bh->b_data + off;
+
+ /* test if filesystem is not corrupted */
+
+ i_eoff = le32_to_cpu(di->i_eoffset);
+ i_sblock = le32_to_cpu(di->i_sblock);
+ i_eblock = le32_to_cpu(di->i_eblock);
+ s_size = le32_to_cpu(bfs_sb->s_end);
+
+ if (i_sblock > info->si_blocks ||
+ i_eblock > info->si_blocks ||
+ i_sblock > i_eblock ||
+ i_eoff > s_size ||
+ i_sblock * BFS_BSIZE > i_eoff) {
+
+ printf("Inode 0x%08x corrupted\n", i);
+
+ brelse(bh);
+ ret = -EIO;
+ goto out3;
+ }
+
+ if (!di->i_ino) {
+ info->si_freei++;
+ continue;
+ }
+ set_bit(i, info->si_imap);
+ info->si_freeb -= BFS_FILEBLOCKS(di);
+
+ eblock = le32_to_cpu(di->i_eblock);
+ if (eblock > info->si_lf_eblk)
+ info->si_lf_eblk = eblock;
+ }
+ brelse(bh);
+ brelse(sbh);
+ bfs_dump_imap("read_super", s);
+ return 0;
+
+out3:
+ dput(s->s_root);
+ s->s_root = NULL;
+out2:
+ kfree(info->si_imap);
+out1:
+ brelse(sbh);
+out:
+ mutex_destroy(&info->bfs_lock);
+ kfree(info);
+ s->s_fs_info = NULL;
+ return ret;
+}
+
+static struct dentry *bfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
+}
+
+static struct file_system_type bfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "bfs",
+ .mount = bfs_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("bfs");
+
+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)
Code Review / kvmfornfv.git / blobdiff