mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 21:30:43 +00:00
2da566edd8
Signed-off-by: Chris Mason <chris.mason@oracle.com>
1464 lines
37 KiB
C
1464 lines
37 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 "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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#define BTRFS_SUPER_MAGIC 0x9123682E
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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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static struct inode_operations btrfs_file_inode_operations;
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static struct address_space_operations btrfs_aops;
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static struct file_operations btrfs_file_operations;
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static int check_inode(struct inode *inode)
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{
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struct btrfs_inode *ei = BTRFS_I(inode);
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WARN_ON(ei->magic != 0xDEADBEEF);
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WARN_ON(ei->magic2 != 0xDEADBEAF);
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return 0;
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}
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static void btrfs_read_locked_inode(struct inode *inode)
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{
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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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path = btrfs_alloc_path();
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BUG_ON(!path);
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btrfs_init_path(path);
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mutex_lock(&root->fs_info->fs_mutex);
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check_inode(inode);
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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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btrfs_release_path(root, path);
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btrfs_free_path(path);
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mutex_unlock(&root->fs_info->fs_mutex);
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make_bad_inode(inode);
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return;
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}
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check_inode(inode);
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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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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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btrfs_free_path(path);
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inode_item = NULL;
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mutex_unlock(&root->fs_info->fs_mutex);
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check_inode(inode);
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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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inode->i_mapping->a_ops = &btrfs_aops;
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inode->i_fop = &btrfs_file_operations;
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inode->i_op = &btrfs_file_inode_operations;
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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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}
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check_inode(inode);
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return;
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}
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static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *dir,
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struct dentry *dentry)
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{
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struct btrfs_path *path;
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const char *name = dentry->d_name.name;
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int name_len = dentry->d_name.len;
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int ret;
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u64 objectid;
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struct btrfs_dir_item *di;
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path = btrfs_alloc_path();
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BUG_ON(!path);
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btrfs_init_path(path);
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ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
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name, name_len, -1);
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if (ret < 0)
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goto err;
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if (ret > 0) {
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ret = -ENOENT;
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goto err;
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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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objectid = btrfs_dir_objectid(di);
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ret = btrfs_del_item(trans, root, path);
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BUG_ON(ret);
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dentry->d_inode->i_ctime = dir->i_ctime;
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err:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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if (ret == 0)
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inode_dec_link_count(dentry->d_inode);
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return ret;
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}
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static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct btrfs_root *root;
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struct btrfs_trans_handle *trans;
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int ret;
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root = btrfs_sb(dir->i_sb);
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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_unlink_trans(trans, root, dir, dentry);
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btrfs_end_transaction(trans, root);
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mutex_unlock(&root->fs_info->fs_mutex);
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return ret;
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}
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static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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int err;
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int ret;
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struct btrfs_root *root = btrfs_sb(dir->i_sb);
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_trans_handle *trans;
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struct btrfs_disk_key *found_key;
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struct btrfs_leaf *leaf;
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path = btrfs_alloc_path();
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BUG_ON(!path);
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btrfs_init_path(path);
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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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key.objectid = inode->i_ino;
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key.offset = (u64)-1;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret < 0) {
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err = ret;
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goto out;
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}
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BUG_ON(ret == 0);
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BUG_ON(path->slots[0] == 0);
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path->slots[0]--;
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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found_key = &leaf->items[path->slots[0]].key;
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if (btrfs_disk_key_objectid(found_key) != inode->i_ino) {
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err = -ENOENT;
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goto out;
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}
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if (btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
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btrfs_disk_key_offset(found_key) != 2) {
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err = -ENOTEMPTY;
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goto out;
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}
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ret = btrfs_del_item(trans, root, path);
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BUG_ON(ret);
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btrfs_release_path(root, path);
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key.offset = 1;
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret < 0) {
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err = ret;
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goto out;
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}
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if (ret > 0) {
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err = -ENOTEMPTY;
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goto out;
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}
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ret = btrfs_del_item(trans, root, path);
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if (ret) {
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err = ret;
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goto out;
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}
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btrfs_release_path(root, path);
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/* now the directory is empty */
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err = btrfs_unlink_trans(trans, root, dir, dentry);
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if (!err) {
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inode->i_size = 0;
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}
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out:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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mutex_unlock(&root->fs_info->fs_mutex);
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ret = btrfs_end_transaction(trans, root);
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if (ret && !err)
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err = ret;
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return err;
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}
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static int btrfs_free_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *inode)
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{
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u64 objectid = inode->i_ino;
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struct btrfs_path *path;
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struct btrfs_inode_map_item *map;
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struct btrfs_key stat_data_key;
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int ret;
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clear_inode(inode);
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path = btrfs_alloc_path();
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BUG_ON(!path);
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btrfs_init_path(path);
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ret = btrfs_lookup_inode_map(trans, root, path, objectid, -1);
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if (ret) {
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if (ret > 0)
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ret = -ENOENT;
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goto error;
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}
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map = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
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struct btrfs_inode_map_item);
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btrfs_disk_key_to_cpu(&stat_data_key, &map->key);
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ret = btrfs_del_item(trans, root->fs_info->inode_root, path);
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BUG_ON(ret);
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btrfs_release_path(root, path);
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ret = btrfs_lookup_inode(trans, root, path, objectid, -1);
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BUG_ON(ret);
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ret = btrfs_del_item(trans, root, path);
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BUG_ON(ret);
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error:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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return ret;
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}
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static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *inode)
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{
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int ret;
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_disk_key *found_key;
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struct btrfs_leaf *leaf;
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struct btrfs_file_extent_item *fi = NULL;
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u64 extent_start = 0;
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u64 extent_num_blocks = 0;
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int found_extent;
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path = btrfs_alloc_path();
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BUG_ON(!path);
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/* FIXME, add redo link to tree so we don't leak on crash */
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key.objectid = inode->i_ino;
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key.offset = (u64)-1;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
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while(1) {
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btrfs_init_path(path);
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret < 0) {
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goto error;
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}
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if (ret > 0) {
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BUG_ON(path->slots[0] == 0);
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path->slots[0]--;
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}
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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found_key = &leaf->items[path->slots[0]].key;
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if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
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break;
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if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY &&
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btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
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break;
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if (btrfs_disk_key_offset(found_key) < inode->i_size)
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break;
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if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) {
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fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
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path->slots[0],
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struct btrfs_file_extent_item);
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extent_start = btrfs_file_extent_disk_blocknr(fi);
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extent_num_blocks =
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btrfs_file_extent_disk_num_blocks(fi);
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inode->i_blocks -=
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btrfs_file_extent_num_blocks(fi) >> 9;
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found_extent = 1;
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} else {
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found_extent = 0;
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}
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ret = btrfs_del_item(trans, root, path);
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BUG_ON(ret);
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btrfs_release_path(root, path);
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if (found_extent) {
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ret = btrfs_free_extent(trans, root, extent_start,
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extent_num_blocks, 0);
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BUG_ON(ret);
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}
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}
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ret = 0;
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error:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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return ret;
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}
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static void btrfs_delete_inode(struct inode *inode)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root = btrfs_sb(inode->i_sb);
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int ret;
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truncate_inode_pages(&inode->i_data, 0);
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if (is_bad_inode(inode)) {
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goto no_delete;
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}
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inode->i_size = 0;
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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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if (S_ISREG(inode->i_mode)) {
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ret = btrfs_truncate_in_trans(trans, root, inode);
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BUG_ON(ret);
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}
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btrfs_free_inode(trans, root, inode);
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btrfs_end_transaction(trans, root);
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mutex_unlock(&root->fs_info->fs_mutex);
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return;
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no_delete:
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clear_inode(inode);
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}
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|
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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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|
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path = btrfs_alloc_path();
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BUG_ON(!path);
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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 || !btrfs_match_dir_item_name(root, path, name, namelen)) {
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*ino = 0;
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ret = 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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btrfs_free_path(path);
|
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check_inode(dir);
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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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struct btrfs_root *root = btrfs_sb(dir->i_sb);
|
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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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mutex_lock(&root->fs_info->fs_mutex);
|
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ret = btrfs_inode_by_name(dir, dentry, &ino);
|
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mutex_unlock(&root->fs_info->fs_mutex);
|
|
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);
|
|
if (!inode)
|
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return ERR_PTR(-EACCES);
|
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check_inode(inode);
|
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}
|
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check_inode(dir);
|
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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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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;
|
|
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 = 0;
|
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
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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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path = btrfs_alloc_path();
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btrfs_init_path(path);
|
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0) {
|
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goto err;
|
|
}
|
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advance = 0;
|
|
while(1) {
|
|
leaf = btrfs_buffer_leaf(path->nodes[0]);
|
|
nritems = btrfs_header_nritems(&leaf->header);
|
|
slot = path->slots[0];
|
|
if (advance || slot >= nritems) {
|
|
if (slot >= nritems -1) {
|
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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];
|
|
} else {
|
|
slot++;
|
|
path->slots[0]++;
|
|
}
|
|
}
|
|
advance = 1;
|
|
item = leaf->items + slot;
|
|
if (btrfs_disk_key_objectid(&item->key) != key.objectid)
|
|
break;
|
|
if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
|
|
continue;
|
|
if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
|
|
continue;
|
|
|
|
advance = 1;
|
|
di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
|
|
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) {
|
|
filp->f_pos = btrfs_disk_key_offset(&item->key);
|
|
break;
|
|
}
|
|
filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
|
|
}
|
|
ret = 0;
|
|
err:
|
|
btrfs_release_path(root, path);
|
|
btrfs_free_path(path);
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_put_super (struct super_block * sb)
|
|
{
|
|
struct btrfs_root *root = btrfs_sb(sb);
|
|
int ret;
|
|
|
|
ret = close_ctree(root);
|
|
if (ret) {
|
|
printk("close ctree returns %d\n", ret);
|
|
}
|
|
sb->s_fs_info = NULL;
|
|
}
|
|
|
|
static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
|
|
{
|
|
struct inode * inode;
|
|
struct dentry * root_dentry;
|
|
struct btrfs_super_block *disk_super;
|
|
struct btrfs_root *root;
|
|
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_magic = BTRFS_SUPER_MAGIC;
|
|
sb->s_op = &btrfs_super_ops;
|
|
sb->s_time_gran = 1;
|
|
|
|
root = open_ctree(sb);
|
|
|
|
if (!root) {
|
|
printk("btrfs: open_ctree failed\n");
|
|
return -EIO;
|
|
}
|
|
sb->s_fs_info = root;
|
|
disk_super = root->fs_info->disk_super;
|
|
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;
|
|
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;
|
|
}
|
|
sb->s_root = root_dentry;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void fill_inode_item(struct btrfs_inode_item *item,
|
|
struct inode *inode)
|
|
{
|
|
btrfs_set_inode_uid(item, inode->i_uid);
|
|
btrfs_set_inode_gid(item, inode->i_gid);
|
|
btrfs_set_inode_size(item, inode->i_size);
|
|
btrfs_set_inode_mode(item, inode->i_mode);
|
|
btrfs_set_inode_nlink(item, inode->i_nlink);
|
|
btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
|
|
btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
|
|
btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
|
|
btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
|
|
btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
|
|
btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
|
|
btrfs_set_inode_nblocks(item, inode->i_blocks);
|
|
btrfs_set_inode_generation(item, inode->i_generation);
|
|
check_inode(inode);
|
|
}
|
|
|
|
static int btrfs_update_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *inode)
|
|
{
|
|
struct btrfs_inode_item *inode_item;
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
BUG_ON(!path);
|
|
btrfs_init_path(path);
|
|
|
|
ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto failed;
|
|
}
|
|
|
|
inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
|
|
path->slots[0],
|
|
struct btrfs_inode_item);
|
|
|
|
fill_inode_item(inode_item, inode);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
failed:
|
|
btrfs_release_path(root, path);
|
|
btrfs_free_path(path);
|
|
check_inode(inode);
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_write_inode(struct inode *inode, int wait)
|
|
{
|
|
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
int ret;
|
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
if (wait)
|
|
btrfs_commit_transaction(trans, root);
|
|
else
|
|
btrfs_end_transaction(trans, root);
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
check_inode(inode);
|
|
return ret;
|
|
}
|
|
|
|
static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
|
|
struct inode *dir, int mode)
|
|
{
|
|
struct inode *inode;
|
|
struct btrfs_inode_item inode_item;
|
|
struct btrfs_root *root = btrfs_sb(dir->i_sb);
|
|
struct btrfs_key key;
|
|
int ret;
|
|
u64 objectid;
|
|
|
|
inode = new_inode(dir->i_sb);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
check_inode(inode);
|
|
ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
|
|
BUG_ON(ret);
|
|
|
|
inode->i_uid = current->fsuid;
|
|
inode->i_gid = current->fsgid;
|
|
inode->i_mode = mode;
|
|
inode->i_ino = objectid;
|
|
inode->i_blocks = 0;
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
|
|
fill_inode_item(&inode_item, inode);
|
|
|
|
key.objectid = objectid;
|
|
key.flags = 0;
|
|
key.offset = 0;
|
|
btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
|
|
ret = btrfs_insert_inode_map(trans, root, objectid, &key);
|
|
BUG_ON(ret);
|
|
|
|
ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
|
|
BUG_ON(ret);
|
|
|
|
insert_inode_hash(inode);
|
|
check_inode(inode);
|
|
check_inode(dir);
|
|
return inode;
|
|
}
|
|
|
|
static int btrfs_add_link(struct btrfs_trans_handle *trans,
|
|
struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int ret;
|
|
ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
|
|
dentry->d_name.name, dentry->d_name.len,
|
|
dentry->d_parent->d_inode->i_ino,
|
|
inode->i_ino, 0);
|
|
if (ret == 0) {
|
|
dentry->d_parent->d_inode->i_size += dentry->d_name.len;
|
|
ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb),
|
|
dentry->d_parent->d_inode);
|
|
}
|
|
check_inode(inode);
|
|
check_inode(dentry->d_parent->d_inode);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
|
|
struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int err = btrfs_add_link(trans, dentry, inode);
|
|
if (!err) {
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
}
|
|
if (err > 0)
|
|
err = -EEXIST;
|
|
check_inode(inode);
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_create(struct inode *dir, struct dentry *dentry,
|
|
int mode, struct nameidata *nd)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = btrfs_sb(dir->i_sb);
|
|
struct inode *inode;
|
|
int err;
|
|
int drop_inode = 0;
|
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
inode = btrfs_new_inode(trans, dir, mode);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out_unlock;
|
|
// FIXME mark the inode dirty
|
|
err = btrfs_add_nondir(trans, dentry, inode);
|
|
if (err)
|
|
drop_inode = 1;
|
|
else {
|
|
inode->i_mapping->a_ops = &btrfs_aops;
|
|
inode->i_fop = &btrfs_file_operations;
|
|
inode->i_op = &btrfs_file_inode_operations;
|
|
}
|
|
dir->i_sb->s_dirt = 1;
|
|
out_unlock:
|
|
btrfs_end_transaction(trans, root);
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
check_inode(inode);
|
|
check_inode(dir);
|
|
|
|
if (drop_inode) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
|
|
struct inode *inode, struct inode *dir)
|
|
{
|
|
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
|
int ret;
|
|
char buf[2];
|
|
buf[0] = '.';
|
|
buf[1] = '.';
|
|
|
|
ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
|
|
inode->i_ino, 1);
|
|
if (ret)
|
|
goto error;
|
|
ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
|
|
dir->i_ino, 1);
|
|
if (ret)
|
|
goto error;
|
|
inode->i_size = 3;
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
struct inode *inode;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = btrfs_sb(dir->i_sb);
|
|
int err = 0;
|
|
int drop_on_err = 0;
|
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
goto out_unlock;
|
|
}
|
|
inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_fail;
|
|
}
|
|
drop_on_err = 1;
|
|
inode->i_op = &btrfs_dir_inode_operations;
|
|
inode->i_fop = &btrfs_dir_file_operations;
|
|
|
|
err = btrfs_make_empty_dir(trans, inode, dir);
|
|
if (err)
|
|
goto out_fail;
|
|
err = btrfs_add_link(trans, dentry, inode);
|
|
if (err)
|
|
goto out_fail;
|
|
d_instantiate(dentry, inode);
|
|
drop_on_err = 0;
|
|
|
|
out_fail:
|
|
btrfs_end_transaction(trans, root);
|
|
out_unlock:
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
if (drop_on_err)
|
|
iput(inode);
|
|
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;
|
|
}
|
|
filemap_write_and_wait(root->fs_info->btree_inode->i_mapping);
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
sb->s_dirt = 0;
|
|
BUG_ON(ret);
|
|
printk("btrfs sync_fs\n");
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *result, int create)
|
|
{
|
|
int ret;
|
|
int err = 0;
|
|
u64 blocknr;
|
|
u64 extent_start = 0;
|
|
u64 extent_end = 0;
|
|
u64 objectid = inode->i_ino;
|
|
struct btrfs_path *path;
|
|
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct btrfs_file_extent_item *item;
|
|
struct btrfs_leaf *leaf;
|
|
struct btrfs_disk_key *found_key;
|
|
|
|
path = btrfs_alloc_path();
|
|
BUG_ON(!path);
|
|
btrfs_init_path(path);
|
|
if (create)
|
|
trans = btrfs_start_transaction(root, 1);
|
|
|
|
|
|
ret = btrfs_lookup_file_extent(trans, root, path,
|
|
inode->i_ino,
|
|
iblock << inode->i_blkbits, 0);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
|
|
if (ret != 0) {
|
|
if (path->slots[0] == 0) {
|
|
btrfs_release_path(root, path);
|
|
goto allocate;
|
|
}
|
|
path->slots[0]--;
|
|
}
|
|
|
|
item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
leaf = btrfs_buffer_leaf(path->nodes[0]);
|
|
blocknr = btrfs_file_extent_disk_blocknr(item);
|
|
blocknr += btrfs_file_extent_offset(item);
|
|
|
|
/* exact match found, use it */
|
|
if (ret == 0) {
|
|
err = 0;
|
|
map_bh(result, inode->i_sb, blocknr);
|
|
goto out;
|
|
}
|
|
|
|
/* are we inside the extent that was found? */
|
|
found_key = &leaf->items[path->slots[0]].key;
|
|
if (btrfs_disk_key_objectid(found_key) != objectid ||
|
|
btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
|
|
extent_end = 0;
|
|
extent_start = 0;
|
|
btrfs_release_path(root, path);
|
|
goto allocate;
|
|
}
|
|
|
|
extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
|
|
extent_start = extent_start >> inode->i_blkbits;
|
|
extent_start += btrfs_file_extent_offset(item);
|
|
extent_end = extent_start + btrfs_file_extent_num_blocks(item);
|
|
if (iblock >= extent_start && iblock < extent_end) {
|
|
err = 0;
|
|
map_bh(result, inode->i_sb, blocknr + iblock - extent_start);
|
|
goto out;
|
|
}
|
|
allocate:
|
|
/* ok, create a new extent */
|
|
if (!create) {
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
ret = btrfs_alloc_file_extent(trans, root, objectid,
|
|
iblock << inode->i_blkbits,
|
|
1, extent_end, &blocknr);
|
|
if (ret) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
inode->i_blocks += inode->i_sb->s_blocksize >> 9;
|
|
set_buffer_new(result);
|
|
map_bh(result, inode->i_sb, blocknr);
|
|
|
|
out:
|
|
btrfs_release_path(root, path);
|
|
btrfs_free_path(path);
|
|
if (trans)
|
|
btrfs_end_transaction(trans, root);
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_get_block(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *result, int create)
|
|
{
|
|
int err;
|
|
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
err = btrfs_get_block_lock(inode, iblock, result, create);
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_prepare_write(struct file *file, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
WARN_ON(1);
|
|
return nobh_prepare_write(page, from, to, btrfs_get_block);
|
|
}
|
|
static int btrfs_commit_write(struct file *file, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
WARN_ON(1);
|
|
return nobh_commit_write(file, page, from, to);
|
|
}
|
|
|
|
static void btrfs_write_super(struct super_block *sb)
|
|
{
|
|
btrfs_sync_fs(sb, 1);
|
|
}
|
|
|
|
static int btrfs_readpage(struct file *file, struct page *page)
|
|
{
|
|
return mpage_readpage(page, btrfs_get_block);
|
|
}
|
|
|
|
static int btrfs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block);
|
|
}
|
|
|
|
static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
return nobh_writepage(page, btrfs_get_block, wbc);
|
|
}
|
|
|
|
static void btrfs_truncate(struct inode *inode)
|
|
{
|
|
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
|
int ret;
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
if (!S_ISREG(inode->i_mode))
|
|
return;
|
|
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
|
|
return;
|
|
|
|
nobh_truncate_page(inode->i_mapping, inode->i_size);
|
|
|
|
/* FIXME, add redo link to tree so we don't leak on crash */
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
ret = btrfs_truncate_in_trans(trans, root, inode);
|
|
BUG_ON(ret);
|
|
ret = btrfs_end_transaction(trans, root);
|
|
BUG_ON(ret);
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
|
|
struct page **prepared_pages,
|
|
const char __user * buf)
|
|
{
|
|
long page_fault = 0;
|
|
int i;
|
|
int offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
|
|
for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
|
|
size_t count = min_t(size_t,
|
|
PAGE_CACHE_SIZE - offset, write_bytes);
|
|
struct page *page = prepared_pages[i];
|
|
fault_in_pages_readable(buf, count);
|
|
|
|
/* Copy data from userspace to the current page */
|
|
kmap(page);
|
|
page_fault = __copy_from_user(page_address(page) + offset,
|
|
buf, count);
|
|
/* Flush processor's dcache for this page */
|
|
flush_dcache_page(page);
|
|
kunmap(page);
|
|
buf += count;
|
|
write_bytes -= count;
|
|
|
|
if (page_fault)
|
|
break;
|
|
}
|
|
return page_fault ? -EFAULT : 0;
|
|
}
|
|
|
|
static void btrfs_drop_pages(struct page **pages, size_t num_pages)
|
|
{
|
|
size_t i;
|
|
for (i = 0; i < num_pages; i++) {
|
|
if (!pages[i])
|
|
break;
|
|
unlock_page(pages[i]);
|
|
mark_page_accessed(pages[i]);
|
|
page_cache_release(pages[i]);
|
|
}
|
|
}
|
|
static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct file *file,
|
|
struct page **pages,
|
|
size_t num_pages,
|
|
loff_t pos,
|
|
size_t write_bytes)
|
|
{
|
|
int i;
|
|
int offset;
|
|
int err = 0;
|
|
int ret;
|
|
int this_write;
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
offset = pos & (PAGE_CACHE_SIZE -1);
|
|
this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
|
|
/* FIXME, one block at a time */
|
|
|
|
mutex_lock(&root->fs_info->fs_mutex);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
btrfs_csum_file_block(trans, root, inode->i_ino,
|
|
pages[i]->index << PAGE_CACHE_SHIFT,
|
|
kmap(pages[i]), PAGE_CACHE_SIZE);
|
|
kunmap(pages[i]);
|
|
SetPageChecked(pages[i]);
|
|
ret = btrfs_end_transaction(trans, root);
|
|
BUG_ON(ret);
|
|
mutex_unlock(&root->fs_info->fs_mutex);
|
|
|
|
ret = nobh_commit_write(file, pages[i], offset,
|
|
offset + this_write);
|
|
pos += this_write;
|
|
if (ret) {
|
|
err = ret;
|
|
goto failed;
|
|
}
|
|
WARN_ON(this_write > write_bytes);
|
|
write_bytes -= this_write;
|
|
}
|
|
failed:
|
|
return err;
|
|
}
|
|
|
|
static int prepare_pages(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct file *file,
|
|
struct page **pages,
|
|
size_t num_pages,
|
|
loff_t pos,
|
|
size_t write_bytes)
|
|
{
|
|
int i;
|
|
unsigned long index = pos >> PAGE_CACHE_SHIFT;
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
int offset;
|
|
int err = 0;
|
|
int ret;
|
|
int this_write;
|
|
loff_t isize = i_size_read(inode);
|
|
|
|
memset(pages, 0, num_pages * sizeof(struct page *));
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
pages[i] = grab_cache_page(inode->i_mapping, index + i);
|
|
if (!pages[i]) {
|
|
err = -ENOMEM;
|
|
goto failed_release;
|
|
}
|
|
offset = pos & (PAGE_CACHE_SIZE -1);
|
|
this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
|
|
ret = nobh_prepare_write(pages[i], offset,
|
|
offset + this_write,
|
|
btrfs_get_block);
|
|
pos += this_write;
|
|
if (ret) {
|
|
err = ret;
|
|
goto failed_truncate;
|
|
}
|
|
WARN_ON(this_write > write_bytes);
|
|
write_bytes -= this_write;
|
|
}
|
|
return 0;
|
|
|
|
failed_release:
|
|
btrfs_drop_pages(pages, num_pages);
|
|
return err;
|
|
|
|
failed_truncate:
|
|
btrfs_drop_pages(pages, num_pages);
|
|
if (pos > isize)
|
|
vmtruncate(inode, isize);
|
|
return err;
|
|
}
|
|
|
|
static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
loff_t pos;
|
|
size_t num_written = 0;
|
|
int err = 0;
|
|
int ret = 0;
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct btrfs_root *root = btrfs_sb(inode->i_sb);
|
|
struct page *pages[1];
|
|
|
|
if (file->f_flags & O_DIRECT)
|
|
return -EINVAL;
|
|
pos = *ppos;
|
|
|
|
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
|
|
current->backing_dev_info = inode->i_mapping->backing_dev_info;
|
|
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
|
|
if (err)
|
|
goto out;
|
|
if (count == 0)
|
|
goto out;
|
|
err = remove_suid(file->f_path.dentry);
|
|
if (err)
|
|
goto out;
|
|
file_update_time(file);
|
|
mutex_lock(&inode->i_mutex);
|
|
while(count > 0) {
|
|
size_t offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
|
|
size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
|
|
PAGE_CACHE_SHIFT;
|
|
ret = prepare_pages(NULL, root, file, pages, num_pages,
|
|
pos, write_bytes);
|
|
BUG_ON(ret);
|
|
ret = btrfs_copy_from_user(pos, num_pages,
|
|
write_bytes, pages, buf);
|
|
BUG_ON(ret);
|
|
|
|
ret = dirty_and_release_pages(NULL, root, file, pages,
|
|
num_pages, pos, write_bytes);
|
|
BUG_ON(ret);
|
|
btrfs_drop_pages(pages, num_pages);
|
|
|
|
buf += write_bytes;
|
|
count -= write_bytes;
|
|
pos += write_bytes;
|
|
num_written += write_bytes;
|
|
|
|
balance_dirty_pages_ratelimited(inode->i_mapping);
|
|
cond_resched();
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
out:
|
|
*ppos = pos;
|
|
current->backing_dev_info = NULL;
|
|
return num_written ? num_written : err;
|
|
}
|
|
|
|
static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
|
|
unsigned long offset, unsigned long size)
|
|
{
|
|
char *kaddr;
|
|
unsigned long left, count = desc->count;
|
|
|
|
if (size > count)
|
|
size = count;
|
|
|
|
if (!PageChecked(page)) {
|
|
/* FIXME, do it per block */
|
|
struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb);
|
|
int ret = btrfs_csum_verify_file_block(root,
|
|
page->mapping->host->i_ino,
|
|
page->index << PAGE_CACHE_SHIFT,
|
|
kmap(page), PAGE_CACHE_SIZE);
|
|
if (ret) {
|
|
printk("failed to verify ino %lu page %lu\n",
|
|
page->mapping->host->i_ino,
|
|
page->index);
|
|
memset(page_address(page), 0, PAGE_CACHE_SIZE);
|
|
}
|
|
SetPageChecked(page);
|
|
kunmap(page);
|
|
}
|
|
/*
|
|
* Faults on the destination of a read are common, so do it before
|
|
* taking the kmap.
|
|
*/
|
|
if (!fault_in_pages_writeable(desc->arg.buf, size)) {
|
|
kaddr = kmap_atomic(page, KM_USER0);
|
|
left = __copy_to_user_inatomic(desc->arg.buf,
|
|
kaddr + offset, size);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
if (left == 0)
|
|
goto success;
|
|
}
|
|
|
|
/* Do it the slow way */
|
|
kaddr = kmap(page);
|
|
left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
|
|
kunmap(page);
|
|
|
|
if (left) {
|
|
size -= left;
|
|
desc->error = -EFAULT;
|
|
}
|
|
success:
|
|
desc->count = count - size;
|
|
desc->written += size;
|
|
desc->arg.buf += size;
|
|
return size;
|
|
}
|
|
|
|
/**
|
|
* btrfs_file_aio_read - filesystem read routine
|
|
* @iocb: kernel I/O control block
|
|
* @iov: io vector request
|
|
* @nr_segs: number of segments in the iovec
|
|
* @pos: current file position
|
|
*/
|
|
static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct file *filp = iocb->ki_filp;
|
|
ssize_t retval;
|
|
unsigned long seg;
|
|
size_t count;
|
|
loff_t *ppos = &iocb->ki_pos;
|
|
|
|
count = 0;
|
|
for (seg = 0; seg < nr_segs; seg++) {
|
|
const struct iovec *iv = &iov[seg];
|
|
|
|
/*
|
|
* If any segment has a negative length, or the cumulative
|
|
* length ever wraps negative then return -EINVAL.
|
|
*/
|
|
count += iv->iov_len;
|
|
if (unlikely((ssize_t)(count|iv->iov_len) < 0))
|
|
return -EINVAL;
|
|
if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
|
|
continue;
|
|
if (seg == 0)
|
|
return -EFAULT;
|
|
nr_segs = seg;
|
|
count -= iv->iov_len; /* This segment is no good */
|
|
break;
|
|
}
|
|
retval = 0;
|
|
if (count) {
|
|
for (seg = 0; seg < nr_segs; seg++) {
|
|
read_descriptor_t desc;
|
|
|
|
desc.written = 0;
|
|
desc.arg.buf = iov[seg].iov_base;
|
|
desc.count = iov[seg].iov_len;
|
|
if (desc.count == 0)
|
|
continue;
|
|
desc.error = 0;
|
|
do_generic_file_read(filp, ppos, &desc,
|
|
btrfs_read_actor);
|
|
retval += desc.written;
|
|
if (desc.error) {
|
|
retval = retval ?: desc.error;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static struct kmem_cache *btrfs_inode_cachep;
|
|
struct kmem_cache *btrfs_trans_handle_cachep;
|
|
struct kmem_cache *btrfs_transaction_cachep;
|
|
struct kmem_cache *btrfs_bit_radix_cachep;
|
|
struct kmem_cache *btrfs_path_cachep;
|
|
|
|
/*
|
|
* Called inside transaction, so use GFP_NOFS
|
|
*/
|
|
static struct inode *btrfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct btrfs_inode *ei;
|
|
|
|
ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
|
|
if (!ei)
|
|
return NULL;
|
|
ei->magic = 0xDEADBEEF;
|
|
ei->magic2 = 0xDEADBEAF;
|
|
return &ei->vfs_inode;
|
|
}
|
|
|
|
static void btrfs_destroy_inode(struct inode *inode)
|
|
{
|
|
struct btrfs_inode *ei = BTRFS_I(inode);
|
|
WARN_ON(ei->magic != 0xDEADBEEF);
|
|
WARN_ON(ei->magic2 != 0xDEADBEAF);
|
|
WARN_ON(!list_empty(&inode->i_dentry));
|
|
WARN_ON(inode->i_data.nrpages);
|
|
|
|
ei->magic = 0;
|
|
ei->magic2 = 0;
|
|
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
|
|
}
|
|
|
|
static void init_once(void * foo, struct kmem_cache * cachep,
|
|
unsigned long flags)
|
|
{
|
|
struct btrfs_inode *ei = (struct btrfs_inode *) foo;
|
|
|
|
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
|
|
SLAB_CTOR_CONSTRUCTOR) {
|
|
inode_init_once(&ei->vfs_inode);
|
|
}
|
|
}
|
|
|
|
static int init_inodecache(void)
|
|
{
|
|
btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
|
|
sizeof(struct btrfs_inode),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
init_once, NULL);
|
|
btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
|
|
sizeof(struct btrfs_trans_handle),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
NULL, NULL);
|
|
btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
|
|
sizeof(struct btrfs_transaction),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
NULL, NULL);
|
|
btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
|
|
sizeof(struct btrfs_transaction),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
NULL, NULL);
|
|
btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
|
|
256,
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD |
|
|
SLAB_DESTROY_BY_RCU),
|
|
NULL, NULL);
|
|
if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL ||
|
|
btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(btrfs_inode_cachep);
|
|
kmem_cache_destroy(btrfs_trans_handle_cachep);
|
|
kmem_cache_destroy(btrfs_transaction_cachep);
|
|
kmem_cache_destroy(btrfs_bit_radix_cachep);
|
|
kmem_cache_destroy(btrfs_path_cachep);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
static struct super_operations btrfs_super_ops = {
|
|
.statfs = simple_statfs,
|
|
.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,
|
|
.alloc_inode = btrfs_alloc_inode,
|
|
.destroy_inode = btrfs_destroy_inode,
|
|
};
|
|
|
|
static struct inode_operations btrfs_dir_inode_operations = {
|
|
.lookup = btrfs_lookup,
|
|
.create = btrfs_create,
|
|
.unlink = btrfs_unlink,
|
|
.mkdir = btrfs_mkdir,
|
|
.rmdir = btrfs_rmdir,
|
|
};
|
|
|
|
static struct file_operations btrfs_dir_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.readdir = btrfs_readdir,
|
|
};
|
|
|
|
static struct address_space_operations btrfs_aops = {
|
|
.readpage = btrfs_readpage,
|
|
.readpages = btrfs_readpages,
|
|
.writepage = btrfs_writepage,
|
|
.sync_page = block_sync_page,
|
|
.prepare_write = btrfs_prepare_write,
|
|
.commit_write = btrfs_commit_write,
|
|
};
|
|
|
|
static struct inode_operations btrfs_file_inode_operations = {
|
|
.truncate = btrfs_truncate,
|
|
};
|
|
|
|
static struct file_operations btrfs_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = btrfs_file_aio_read,
|
|
.write = btrfs_file_write,
|
|
.mmap = generic_file_mmap,
|
|
.open = generic_file_open,
|
|
};
|
|
|
|
static int __init init_btrfs_fs(void)
|
|
{
|
|
int err;
|
|
printk("btrfs loaded!\n");
|
|
err = init_inodecache();
|
|
if (err)
|
|
return err;
|
|
return register_filesystem(&btrfs_fs_type);
|
|
}
|
|
|
|
static void __exit exit_btrfs_fs(void)
|
|
{
|
|
destroy_inodecache();
|
|
unregister_filesystem(&btrfs_fs_type);
|
|
printk("btrfs unloaded\n");
|
|
}
|
|
|
|
module_init(init_btrfs_fs)
|
|
module_exit(exit_btrfs_fs)
|
|
|
|
MODULE_LICENSE("GPL");
|