+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
#include <linux/module.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
+#include <linux/mpage.h>
+#include <linux/swap.h>
+#include <linux/writeback.h>
+#include <linux/statfs.h>
+#include <linux/compat.h>
#include "ctree.h"
#include "disk-io.h"
+#include "transaction.h"
+#include "btrfs_inode.h"
+#include "ioctl.h"
+#include "print-tree.h"
#define BTRFS_SUPER_MAGIC 0x9123682E
-static struct inode_operations btrfs_dir_inode_operations;
static struct super_operations btrfs_super_ops;
-static struct file_operations btrfs_dir_file_operations;
-
-#if 0
-/* some random number */
-
-static struct super_operations ramfs_ops;
-
-static struct backing_dev_info ramfs_backing_dev_info = {
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
- BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
- BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
-};
-
-struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev)
-{
- struct inode * inode = new_inode(sb);
-
- if (inode) {
- inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
- inode->i_blocks = 0;
- inode->i_mapping->a_ops = &ramfs_aops;
- inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- switch (mode & S_IFMT) {
- default:
- init_special_inode(inode, mode, dev);
- break;
- case S_IFREG:
- inode->i_op = &ramfs_file_inode_operations;
- inode->i_fop = &ramfs_file_operations;
- break;
- case S_IFDIR:
- inode->i_op = &ramfs_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
-
- /* directory inodes start off with i_nlink == 2 (for "." entry) */
- inc_nlink(inode);
- break;
- case S_IFLNK:
- inode->i_op = &page_symlink_inode_operations;
- break;
- }
- }
- return inode;
-}
-
-/*
- * File creation. Allocate an inode, and we're done..
- */
-/* SMP-safe */
-static int
-ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
-{
- struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
- int error = -ENOSPC;
-
- if (inode) {
- if (dir->i_mode & S_ISGID) {
- inode->i_gid = dir->i_gid;
- if (S_ISDIR(mode))
- inode->i_mode |= S_ISGID;
- }
- d_instantiate(dentry, inode);
- dget(dentry); /* Extra count - pin the dentry in core */
- error = 0;
- dir->i_mtime = dir->i_ctime = CURRENT_TIME;
- }
- return error;
-}
-
-static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
-{
- int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
- if (!retval)
- inc_nlink(dir);
- return retval;
-}
-
-static int ramfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
-{
- return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
-}
-
-static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
-{
- struct inode *inode;
- int error = -ENOSPC;
-
- inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0);
- if (inode) {
- int l = strlen(symname)+1;
- error = page_symlink(inode, symname, l);
- if (!error) {
- if (dir->i_mode & S_ISGID)
- inode->i_gid = dir->i_gid;
- d_instantiate(dentry, inode);
- dget(dentry);
- dir->i_mtime = dir->i_ctime = CURRENT_TIME;
- } else
- iput(inode);
- }
- return error;
-}
-
-static struct inode_operations ramfs_dir_inode_operations = {
- .create = ramfs_create,
- .lookup = simple_lookup,
- .link = simple_link,
- .unlink = simple_unlink,
- .symlink = ramfs_symlink,
- .mkdir = ramfs_mkdir,
- .rmdir = simple_rmdir,
- .mknod = ramfs_mknod,
- .rename = simple_rename,
-};
-#endif
-
-static void btrfs_read_locked_inode(struct inode *inode)
-{
- struct btrfs_path path;
- struct btrfs_inode_item *inode_item;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
- int ret;
-printk("read locked inode %lu\n", inode->i_ino);
- btrfs_init_path(&path);
- ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
- if (ret) {
- make_bad_inode(inode);
- return;
- }
- inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
- path.slots[0],
- struct btrfs_inode_item);
-
-printk("found locked inode %lu\n", inode->i_ino);
- inode->i_mode = btrfs_inode_mode(inode_item);
- inode->i_nlink = btrfs_inode_nlink(inode_item);
- inode->i_uid = btrfs_inode_uid(inode_item);
- inode->i_gid = btrfs_inode_gid(inode_item);
- inode->i_size = btrfs_inode_size(inode_item);
- inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
- inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
- inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
- inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
- inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
- inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
- inode->i_blocks = btrfs_inode_nblocks(inode_item);
- inode->i_generation = btrfs_inode_generation(inode_item);
-printk("about to release\n");
- btrfs_release_path(root, &path);
- switch (inode->i_mode & S_IFMT) {
-#if 0
- default:
- init_special_inode(inode, inode->i_mode,
- btrfs_inode_rdev(inode_item));
- break;
-#endif
- case S_IFREG:
-printk("inode %lu now a file\n", inode->i_ino);
- break;
- case S_IFDIR:
-printk("inode %lu now a directory\n", inode->i_ino);
- inode->i_op = &btrfs_dir_inode_operations;
- inode->i_fop = &btrfs_dir_file_operations;
- break;
- case S_IFLNK:
-printk("inode %lu now a link\n", inode->i_ino);
- // inode->i_op = &page_symlink_inode_operations;
- break;
- }
-printk("returning!\n");
- return;
-}
-
-static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
- ino_t *ino)
-{
- const char *name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
- struct btrfs_dir_item *di;
- struct btrfs_path path;
- struct btrfs_root *root = btrfs_sb(dir->i_sb);
- int ret;
-
- btrfs_init_path(&path);
- ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
- namelen, 0);
- if (ret) {
- *ino = 0;
- goto out;
- }
- di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
- struct btrfs_dir_item);
- *ino = btrfs_dir_objectid(di);
-out:
- btrfs_release_path(root, &path);
- return ret;
-}
-
-static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
-{
- struct inode * inode;
- ino_t ino;
- int ret;
-
- if (dentry->d_name.len > BTRFS_NAME_LEN)
- return ERR_PTR(-ENAMETOOLONG);
-
- ret = btrfs_inode_by_name(dir, dentry, &ino);
- if (ret < 0)
- return ERR_PTR(ret);
- inode = NULL;
- if (ino) {
-printk("lookup on %.*s returns %lu\n", dentry->d_name.len, dentry->d_name.name, ino);
- inode = iget(dir->i_sb, ino);
- if (!inode)
- return ERR_PTR(-EACCES);
- }
- return d_splice_alias(inode, dentry);
-}
-
-static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
- struct btrfs_root *root = btrfs_sb(inode->i_sb);
- struct btrfs_item *item;
- struct btrfs_dir_item *di;
- struct btrfs_key key;
- struct btrfs_path path;
- int ret;
- u32 nritems;
- struct btrfs_leaf *leaf;
- int slot;
- int advance;
- unsigned char d_type = DT_UNKNOWN;
- int over;
-
- key.objectid = inode->i_ino;
-printk("readdir on dir %Lu pos %Lu\n", key.objectid, filp->f_pos);
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
- key.offset = filp->f_pos;
- btrfs_init_path(&path);
- ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
- if (ret < 0) {
- goto err;
- }
-printk("first ret %d\n", ret);
- advance = filp->f_pos > 0 && ret != 0;
- while(1) {
- leaf = btrfs_buffer_leaf(path.nodes[0]);
- nritems = btrfs_header_nritems(&leaf->header);
- slot = path.slots[0];
-printk("leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot);
- if (advance) {
-printk("advancing!\n");
- if (slot == nritems -1) {
- ret = btrfs_next_leaf(root, &path);
- if (ret)
- break;
- leaf = btrfs_buffer_leaf(path.nodes[0]);
- nritems = btrfs_header_nritems(&leaf->header);
- slot = path.slots[0];
-printk("2leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot);
- } else {
- slot++;
- path.slots[0]++;
- }
- }
- advance = 1;
- item = leaf->items + slot;
-printk("item key %Lu %u %Lu\n", btrfs_disk_key_objectid(&item->key),
- btrfs_disk_key_flags(&item->key), btrfs_disk_key_offset(&item->key));
- if (btrfs_disk_key_objectid(&item->key) != key.objectid)
- break;
- if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
- continue;
- di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
-printk("filldir name %.*s, objectid %Lu\n", btrfs_dir_name_len(di),
- (const char *)(di + 1), btrfs_dir_objectid(di));
- over = filldir(dirent, (const char *)(di + 1),
- btrfs_dir_name_len(di),
- btrfs_disk_key_offset(&item->key),
- btrfs_dir_objectid(di), d_type);
- if (over)
- break;
- filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
- }
-printk("filldir all done\n");
- ret = 0;
-err:
- btrfs_release_path(root, &path);
- return ret;
-}
static void btrfs_put_super (struct super_block * sb)
{
struct inode * inode;
struct dentry * root_dentry;
struct btrfs_super_block *disk_super;
- struct buffer_head *bh;
- struct btrfs_root *root;
+ struct btrfs_root *tree_root;
+ struct btrfs_inode *bi;
+ int err;
sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = BTRFS_SUPER_MAGIC;
sb->s_op = &btrfs_super_ops;
sb->s_time_gran = 1;
- bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
- if (!bh) {
- printk("btrfs: unable to read on disk super\n");
- return -EIO;
- }
- disk_super = (struct btrfs_super_block *)bh->b_data;
- root = open_ctree(sb, bh, disk_super);
- sb->s_fs_info = root;
- if (!root) {
+ tree_root = open_ctree(sb);
+
+ if (!tree_root || IS_ERR(tree_root)) {
printk("btrfs: open_ctree failed\n");
return -EIO;
}
- printk("read in super total blocks %Lu root %Lu\n",
- btrfs_super_total_blocks(disk_super),
- btrfs_super_root_dir(disk_super));
-
- inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
- if (!inode)
- return -ENOMEM;
+ sb->s_fs_info = tree_root;
+ disk_super = tree_root->fs_info->disk_super;
+ inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
+ tree_root);
+ bi = BTRFS_I(inode);
+ bi->location.objectid = inode->i_ino;
+ bi->location.offset = 0;
+ bi->location.flags = 0;
+ bi->root = tree_root;
+ btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
+
+ if (!inode) {
+ err = -ENOMEM;
+ goto fail_close;
+ }
if (inode->i_state & I_NEW) {
btrfs_read_locked_inode(inode);
unlock_new_inode(inode);
root_dentry = d_alloc_root(inode);
if (!root_dentry) {
iput(inode);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto fail_close;
}
sb->s_root = root_dentry;
-
+ btrfs_transaction_queue_work(tree_root, HZ * 30);
return 0;
+
+fail_close:
+ close_ctree(tree_root);
+ return err;
+}
+
+static int btrfs_sync_fs(struct super_block *sb, int wait)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root;
+ int ret;
+ root = btrfs_sb(sb);
+
+ sb->s_dirt = 0;
+ if (!wait) {
+ filemap_flush(root->fs_info->btree_inode->i_mapping);
+ return 0;
+ }
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ ret = btrfs_commit_transaction(trans, root);
+ sb->s_dirt = 0;
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
+static void btrfs_write_super(struct super_block *sb)
+{
+ sb->s_dirt = 0;
}
static int btrfs_get_sb(struct file_system_type *fs_type,
btrfs_fill_super, mnt);
}
+static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct btrfs_root *root = btrfs_sb(dentry->d_sb);
+ struct btrfs_super_block *disk_super = root->fs_info->disk_super;
+
+ buf->f_namelen = BTRFS_NAME_LEN;
+ buf->f_blocks = btrfs_super_total_blocks(disk_super);
+ buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
+ buf->f_bavail = buf->f_bfree;
+ buf->f_bsize = dentry->d_sb->s_blocksize;
+ buf->f_type = BTRFS_SUPER_MAGIC;
+ return 0;
+}
+
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
};
static struct super_operations btrfs_super_ops = {
- .statfs = simple_statfs,
- .drop_inode = generic_delete_inode,
+ .delete_inode = btrfs_delete_inode,
.put_super = btrfs_put_super,
.read_inode = btrfs_read_locked_inode,
+ .write_super = btrfs_write_super,
+ .sync_fs = btrfs_sync_fs,
+ .write_inode = btrfs_write_inode,
+ .dirty_inode = btrfs_dirty_inode,
+ .alloc_inode = btrfs_alloc_inode,
+ .destroy_inode = btrfs_destroy_inode,
+ .statfs = btrfs_statfs,
};
-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,
-};
-
-
static int __init init_btrfs_fs(void)
{
- printk("btrfs loaded!\n");
+ int err;
+ btrfs_init_transaction_sys();
+ err = btrfs_init_cachep();
+ if (err)
+ return err;
return register_filesystem(&btrfs_fs_type);
}
static void __exit exit_btrfs_fs(void)
{
+ btrfs_exit_transaction_sys();
+ btrfs_destroy_cachep();
unregister_filesystem(&btrfs_fs_type);
- printk("btrfs unloaded\n");
}
module_init(init_btrfs_fs)
projects / linux-2.6-block.git / blobdiff