2007-03-21 16:12:56 +01:00
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#include <linux/module.h>
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2007-03-22 17:13:20 +01:00
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#include <linux/buffer_head.h>
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2007-03-21 16:12:56 +01:00
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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 "ctree.h"
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2007-03-22 17:13:20 +01:00
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#include "disk-io.h"
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2007-03-21 16:12:56 +01:00
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#define BTRFS_SUPER_MAGIC 0x9123682E
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2007-03-22 17:13:20 +01:00
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static struct inode_operations btrfs_dir_inode_operations;
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static struct super_operations btrfs_super_ops;
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static struct file_operations btrfs_dir_file_operations;
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2007-03-21 16:12:56 +01:00
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#if 0
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/* some random number */
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static struct super_operations ramfs_ops;
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static struct backing_dev_info ramfs_backing_dev_info = {
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.ra_pages = 0, /* No readahead */
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.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
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BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
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BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
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};
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struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev)
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{
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struct inode * inode = new_inode(sb);
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if (inode) {
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inode->i_mode = mode;
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inode->i_uid = current->fsuid;
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inode->i_gid = current->fsgid;
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inode->i_blocks = 0;
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inode->i_mapping->a_ops = &ramfs_aops;
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inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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switch (mode & S_IFMT) {
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default:
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init_special_inode(inode, mode, dev);
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break;
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case S_IFREG:
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inode->i_op = &ramfs_file_inode_operations;
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inode->i_fop = &ramfs_file_operations;
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break;
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case S_IFDIR:
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inode->i_op = &ramfs_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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/* directory inodes start off with i_nlink == 2 (for "." entry) */
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inc_nlink(inode);
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break;
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case S_IFLNK:
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inode->i_op = &page_symlink_inode_operations;
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break;
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}
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}
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return inode;
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}
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/*
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* File creation. Allocate an inode, and we're done..
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*/
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/* SMP-safe */
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static int
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ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
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{
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struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
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int error = -ENOSPC;
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if (inode) {
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if (dir->i_mode & S_ISGID) {
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inode->i_gid = dir->i_gid;
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if (S_ISDIR(mode))
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inode->i_mode |= S_ISGID;
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}
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d_instantiate(dentry, inode);
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dget(dentry); /* Extra count - pin the dentry in core */
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error = 0;
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
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}
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return error;
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}
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static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
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{
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int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
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if (!retval)
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inc_nlink(dir);
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return retval;
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}
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static int ramfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
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{
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return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
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}
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static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
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{
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struct inode *inode;
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int error = -ENOSPC;
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inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0);
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if (inode) {
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int l = strlen(symname)+1;
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error = page_symlink(inode, symname, l);
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if (!error) {
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if (dir->i_mode & S_ISGID)
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inode->i_gid = dir->i_gid;
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d_instantiate(dentry, inode);
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dget(dentry);
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
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} else
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iput(inode);
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}
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return error;
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}
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static struct inode_operations ramfs_dir_inode_operations = {
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.create = ramfs_create,
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.lookup = simple_lookup,
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.link = simple_link,
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.unlink = simple_unlink,
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.symlink = ramfs_symlink,
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.mkdir = ramfs_mkdir,
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.rmdir = simple_rmdir,
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.mknod = ramfs_mknod,
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.rename = simple_rename,
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};
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#endif
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2007-03-22 17:13:20 +01:00
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static void btrfs_read_locked_inode(struct inode *inode)
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2007-03-21 16:12:56 +01:00
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{
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2007-03-22 17:13:20 +01:00
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struct btrfs_path path;
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struct btrfs_inode_item *inode_item;
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struct btrfs_root *root = btrfs_sb(inode->i_sb);
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int ret;
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btrfs_init_path(&path);
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ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
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if (ret) {
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make_bad_inode(inode);
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return;
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}
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inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
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path.slots[0],
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struct btrfs_inode_item);
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2007-03-21 16:12:56 +01:00
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2007-03-22 17:13:20 +01:00
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inode->i_mode = btrfs_inode_mode(inode_item);
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inode->i_nlink = btrfs_inode_nlink(inode_item);
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inode->i_uid = btrfs_inode_uid(inode_item);
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inode->i_gid = btrfs_inode_gid(inode_item);
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inode->i_size = btrfs_inode_size(inode_item);
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inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
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inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
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inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
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inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
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inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
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inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
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inode->i_blocks = btrfs_inode_nblocks(inode_item);
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inode->i_generation = btrfs_inode_generation(inode_item);
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btrfs_release_path(root, &path);
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switch (inode->i_mode & S_IFMT) {
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#if 0
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default:
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init_special_inode(inode, inode->i_mode,
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btrfs_inode_rdev(inode_item));
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break;
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#endif
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case S_IFREG:
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break;
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case S_IFDIR:
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inode->i_op = &btrfs_dir_inode_operations;
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inode->i_fop = &btrfs_dir_file_operations;
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break;
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case S_IFLNK:
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// inode->i_op = &page_symlink_inode_operations;
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break;
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2007-03-21 16:12:56 +01:00
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}
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2007-03-22 17:13:20 +01:00
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return;
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2007-03-21 16:12:56 +01:00
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}
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2007-03-22 17:13:20 +01:00
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static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
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ino_t *ino)
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{
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const char *name = dentry->d_name.name;
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int namelen = dentry->d_name.len;
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struct btrfs_dir_item *di;
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struct btrfs_path path;
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struct btrfs_root *root = btrfs_sb(dir->i_sb);
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int ret;
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btrfs_init_path(&path);
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ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
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namelen, 0);
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if (ret) {
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*ino = 0;
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goto out;
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}
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di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
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struct btrfs_dir_item);
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*ino = btrfs_dir_objectid(di);
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out:
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btrfs_release_path(root, &path);
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return ret;
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}
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static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd)
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{
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struct inode * inode;
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ino_t ino;
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int ret;
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if (dentry->d_name.len > BTRFS_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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ret = btrfs_inode_by_name(dir, dentry, &ino);
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if (ret < 0)
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return ERR_PTR(ret);
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inode = NULL;
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if (ino) {
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inode = iget(dir->i_sb, ino);
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if (!inode)
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return ERR_PTR(-EACCES);
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}
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return d_splice_alias(inode, dentry);
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}
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static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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struct btrfs_root *root = btrfs_sb(inode->i_sb);
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struct btrfs_item *item;
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struct btrfs_dir_item *di;
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struct btrfs_key key;
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struct btrfs_path path;
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int ret;
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u32 nritems;
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struct btrfs_leaf *leaf;
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int slot;
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int advance;
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unsigned char d_type = DT_UNKNOWN;
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int over;
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key.objectid = inode->i_ino;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
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key.offset = filp->f_pos;
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btrfs_init_path(&path);
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ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
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if (ret < 0) {
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goto err;
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}
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advance = filp->f_pos > 0 && ret != 0;
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while(1) {
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leaf = btrfs_buffer_leaf(path.nodes[0]);
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nritems = btrfs_header_nritems(&leaf->header);
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slot = path.slots[0];
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if (advance) {
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if (slot == nritems -1) {
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ret = btrfs_next_leaf(root, &path);
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if (ret)
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break;
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leaf = btrfs_buffer_leaf(path.nodes[0]);
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nritems = btrfs_header_nritems(&leaf->header);
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slot = path.slots[0];
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} else {
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slot++;
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path.slots[0]++;
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}
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}
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advance = 1;
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item = leaf->items + slot;
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if (btrfs_disk_key_objectid(&item->key) != key.objectid)
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break;
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if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
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continue;
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di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
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over = filldir(dirent, (const char *)(di + 1),
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btrfs_dir_name_len(di),
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btrfs_disk_key_offset(&item->key),
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btrfs_dir_objectid(di), d_type);
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if (over)
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break;
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filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
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}
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ret = 0;
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err:
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btrfs_release_path(root, &path);
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return ret;
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}
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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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2007-03-21 16:12:56 +01:00
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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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2007-03-22 17:13:20 +01:00
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struct dentry * root_dentry;
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struct btrfs_super_block *disk_super;
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struct buffer_head *bh;
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struct btrfs_root *root;
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2007-03-21 16:12:56 +01:00
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
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sb->s_magic = BTRFS_SUPER_MAGIC;
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2007-03-22 17:13:20 +01:00
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sb->s_op = &btrfs_super_ops;
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2007-03-21 16:12:56 +01:00
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sb->s_time_gran = 1;
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2007-03-22 17:13:20 +01:00
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bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
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if (!bh) {
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printk("btrfs: unable to read on disk super\n");
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return -EIO;
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}
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disk_super = (struct btrfs_super_block *)bh->b_data;
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root = open_ctree(sb, bh, disk_super);
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sb->s_fs_info = root;
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if (!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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printk("read in super total blocks %Lu root %Lu\n",
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|
|
btrfs_super_total_blocks(disk_super),
|
|
|
|
btrfs_super_root_dir(disk_super));
|
|
|
|
|
|
|
|
inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
|
2007-03-21 16:12:56 +01:00
|
|
|
if (!inode)
|
|
|
|
return -ENOMEM;
|
2007-03-22 17:13:20 +01:00
|
|
|
if (inode->i_state & I_NEW) {
|
|
|
|
btrfs_read_locked_inode(inode);
|
|
|
|
unlock_new_inode(inode);
|
|
|
|
}
|
2007-03-21 16:12:56 +01:00
|
|
|
|
2007-03-22 17:13:20 +01:00
|
|
|
root_dentry = d_alloc_root(inode);
|
|
|
|
if (!root_dentry) {
|
2007-03-21 16:12:56 +01:00
|
|
|
iput(inode);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
2007-03-22 17:13:20 +01:00
|
|
|
sb->s_root = root_dentry;
|
|
|
|
|
2007-03-21 16:12:56 +01:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int btrfs_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,
|
|
|
|
btrfs_fill_super, mnt);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct file_system_type btrfs_fs_type = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.name = "btrfs",
|
|
|
|
.get_sb = btrfs_get_sb,
|
|
|
|
.kill_sb = kill_block_super,
|
|
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
|
|
};
|
|
|
|
|
2007-03-22 17:13:20 +01:00
|
|
|
static struct super_operations btrfs_super_ops = {
|
|
|
|
.statfs = simple_statfs,
|
|
|
|
.drop_inode = generic_delete_inode,
|
|
|
|
.put_super = btrfs_put_super,
|
|
|
|
.read_inode = btrfs_read_locked_inode,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct inode_operations btrfs_dir_inode_operations = {
|
|
|
|
.lookup = btrfs_lookup,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct file_operations btrfs_dir_file_operations = {
|
|
|
|
.llseek = generic_file_llseek,
|
|
|
|
.read = generic_read_dir,
|
|
|
|
.readdir = btrfs_readdir,
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2007-03-21 16:12:56 +01:00
|
|
|
static int __init init_btrfs_fs(void)
|
|
|
|
{
|
|
|
|
printk("btrfs loaded!\n");
|
|
|
|
return register_filesystem(&btrfs_fs_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit exit_btrfs_fs(void)
|
|
|
|
{
|
|
|
|
unregister_filesystem(&btrfs_fs_type);
|
|
|
|
printk("btrfs unloaded\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_btrfs_fs)
|
|
|
|
module_exit(exit_btrfs_fs)
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|