183 lines
4.2 KiB
C
183 lines
4.2 KiB
C
#include <linux/module.h>
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#include <linux/buffer_head.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/smp_lock.h>
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#include <linux/backing-dev.h>
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#include <linux/mpage.h>
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#include <linux/swap.h>
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#include <linux/writeback.h>
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#include <linux/statfs.h>
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#include <linux/compat.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "ioctl.h"
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#include "print-tree.h"
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#define BTRFS_SUPER_MAGIC 0x9123682E
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static struct super_operations btrfs_super_ops;
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static void btrfs_put_super (struct super_block * sb)
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{
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struct btrfs_root *root = btrfs_sb(sb);
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int ret;
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ret = close_ctree(root);
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if (ret) {
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printk("close ctree returns %d\n", ret);
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}
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sb->s_fs_info = NULL;
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}
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static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
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{
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struct inode * inode;
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struct dentry * root_dentry;
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struct btrfs_super_block *disk_super;
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struct btrfs_root *tree_root;
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struct btrfs_inode *bi;
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int err;
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_magic = BTRFS_SUPER_MAGIC;
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sb->s_op = &btrfs_super_ops;
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sb->s_time_gran = 1;
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tree_root = open_ctree(sb);
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if (!tree_root || IS_ERR(tree_root)) {
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printk("btrfs: open_ctree failed\n");
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return -EIO;
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}
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sb->s_fs_info = tree_root;
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disk_super = tree_root->fs_info->disk_super;
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inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
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tree_root);
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bi = BTRFS_I(inode);
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bi->location.objectid = inode->i_ino;
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bi->location.offset = 0;
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bi->location.flags = 0;
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bi->root = tree_root;
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btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
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if (!inode) {
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err = -ENOMEM;
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goto fail_close;
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}
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if (inode->i_state & I_NEW) {
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btrfs_read_locked_inode(inode);
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unlock_new_inode(inode);
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}
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root_dentry = d_alloc_root(inode);
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if (!root_dentry) {
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iput(inode);
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err = -ENOMEM;
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goto fail_close;
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}
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sb->s_root = root_dentry;
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btrfs_transaction_queue_work(tree_root, HZ * 30);
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return 0;
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fail_close:
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close_ctree(tree_root);
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return err;
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}
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static int btrfs_sync_fs(struct super_block *sb, int wait)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root;
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int ret;
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root = btrfs_sb(sb);
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sb->s_dirt = 0;
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if (!wait) {
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filemap_flush(root->fs_info->btree_inode->i_mapping);
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return 0;
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}
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mutex_lock(&root->fs_info->fs_mutex);
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trans = btrfs_start_transaction(root, 1);
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ret = btrfs_commit_transaction(trans, root);
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sb->s_dirt = 0;
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BUG_ON(ret);
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mutex_unlock(&root->fs_info->fs_mutex);
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return 0;
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}
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static void btrfs_write_super(struct super_block *sb)
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{
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sb->s_dirt = 0;
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}
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static int btrfs_get_sb(struct file_system_type *fs_type,
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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,
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btrfs_fill_super, mnt);
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}
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static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct btrfs_root *root = btrfs_sb(dentry->d_sb);
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struct btrfs_super_block *disk_super = root->fs_info->disk_super;
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buf->f_namelen = BTRFS_NAME_LEN;
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buf->f_blocks = btrfs_super_total_blocks(disk_super);
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buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
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buf->f_bavail = buf->f_bfree;
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buf->f_bsize = dentry->d_sb->s_blocksize;
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buf->f_type = BTRFS_SUPER_MAGIC;
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return 0;
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}
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static struct file_system_type btrfs_fs_type = {
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.owner = THIS_MODULE,
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.name = "btrfs",
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.get_sb = btrfs_get_sb,
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.kill_sb = kill_block_super,
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.fs_flags = FS_REQUIRES_DEV,
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};
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static struct super_operations btrfs_super_ops = {
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.delete_inode = btrfs_delete_inode,
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.put_super = btrfs_put_super,
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.read_inode = btrfs_read_locked_inode,
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.write_super = btrfs_write_super,
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.sync_fs = btrfs_sync_fs,
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.write_inode = btrfs_write_inode,
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.dirty_inode = btrfs_dirty_inode,
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.alloc_inode = btrfs_alloc_inode,
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.destroy_inode = btrfs_destroy_inode,
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.statfs = btrfs_statfs,
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};
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static int __init init_btrfs_fs(void)
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{
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int err;
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btrfs_init_transaction_sys();
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err = btrfs_init_cachep();
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if (err)
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return err;
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return register_filesystem(&btrfs_fs_type);
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}
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static void __exit exit_btrfs_fs(void)
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{
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btrfs_exit_transaction_sys();
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btrfs_destroy_cachep();
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unregister_filesystem(&btrfs_fs_type);
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}
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module_init(init_btrfs_fs)
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module_exit(exit_btrfs_fs)
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MODULE_LICENSE("GPL");
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