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Btrfs: add compat ioctl

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-06-08 15:33:54 -04:00 committed by David Woodhouse
parent fabb568183
commit 08607c1b18
6 changed files with 98 additions and 7 deletions
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1
fs/btrfs/TODO
View File

@ -7,7 +7,6 @@
* Get rid of struct ctree_path, limiting tree levels held at one time
* Add generation number to key pointer in nodes
* Add generation number to inode
* Add ability to switch a block group from data to metadata or vice versa
* forbid cross subvolume renames and hardlinks
* Release
* Do real tree locking

5
fs/btrfs/ctree.h
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@ -3,7 +3,7 @@
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kobject.h>
#include <linux/workqueue.h>
#include "bit-radix.h"
struct btrfs_trans_handle;
@ -281,6 +281,7 @@ struct btrfs_block_group_cache {
};
struct crypto_hash;
struct btrfs_fs_info {
struct btrfs_root *extent_root;
struct btrfs_root *tree_root;
@ -308,9 +309,9 @@ struct btrfs_fs_info {
struct mutex fs_mutex;
struct list_head trans_list;
struct crypto_hash *hash_tfm;
struct delayed_work trans_work;
spinlock_t hash_lock;
int do_barriers;
struct kobject kobj;
};
/*

4
fs/btrfs/disk-io.c
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@ -577,6 +577,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
fs_info->do_barriers = 1;
fs_info->extent_tree_insert_nr = 0;
fs_info->extent_tree_prealloc_nr = 0;
INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
BTRFS_I(fs_info->btree_inode)->root = tree_root;
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
sizeof(struct btrfs_key));
@ -648,7 +649,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
btrfs_read_block_groups(extent_root);
fs_info->generation = btrfs_super_generation(disk_super) + 1;
memset(&fs_info->kobj, 0, sizeof(fs_info->kobj));
mutex_unlock(&fs_info->fs_mutex);
return tree_root;
}
@ -746,6 +746,7 @@ int close_ctree(struct btrfs_root *root)
struct btrfs_trans_handle *trans;
struct btrfs_fs_info *fs_info = root->fs_info;
btrfs_transaction_flush_work(root);
mutex_lock(&fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_commit_transaction(trans, root);
@ -776,7 +777,6 @@ int close_ctree(struct btrfs_root *root)
del_fs_roots(fs_info);
kfree(fs_info->extent_root);
kfree(fs_info->tree_root);
kobject_unregister(&fs_info->kobj);
return 0;
}

27
fs/btrfs/super.c
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@ -12,6 +12,7 @@
#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"
@ -950,7 +951,7 @@ static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
return -ENOMEM;
}
sb->s_root = root_dentry;
btrfs_transaction_queue_work(tree_root, HZ * 30);
return 0;
}
@ -1452,7 +1453,7 @@ static int btrfs_prepare_write(struct file *file, struct page *page,
static void btrfs_write_super(struct super_block *sb)
{
btrfs_sync_fs(sb, 1);
sb->s_dirt = 0;
}
static int btrfs_readpage(struct file *file, struct page *page)
@ -2698,6 +2699,20 @@ static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
return ret;
}
#ifdef CONFIG_COMPAT
static long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct inode *inode = file->f_path.dentry->d_inode;
int ret;
lock_kernel();
ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
unlock_kernel();
return ret;
}
#endif
static struct kmem_cache *btrfs_inode_cachep;
struct kmem_cache *btrfs_trans_handle_cachep;
struct kmem_cache *btrfs_transaction_cachep;
@ -3042,6 +3057,9 @@ static struct file_operations btrfs_dir_file_operations = {
.read = generic_read_dir,
.readdir = btrfs_readdir,
.ioctl = btrfs_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = btrfs_compat_ioctl,
#endif
};
static struct address_space_operations btrfs_aops = {
@ -3073,6 +3091,9 @@ static struct file_operations btrfs_file_operations = {
.open = generic_file_open,
.ioctl = btrfs_ioctl,
.fsync = btrfs_sync_file,
#ifdef CONFIG_COMPAT
.compat_ioctl = btrfs_compat_ioctl,
#endif
};
static struct inode_operations btrfs_symlink_inode_operations = {
@ -3085,6 +3106,7 @@ static int __init init_btrfs_fs(void)
{
int err;
printk("btrfs loaded!\n");
btrfs_init_transaction_sys();
err = init_inodecache();
if (err)
return err;
@ -3095,6 +3117,7 @@ static int __init init_btrfs_fs(void)
static void __exit exit_btrfs_fs(void)
{
btrfs_exit_transaction_sys();
destroy_inodecache();
unregister_filesystem(&btrfs_fs_type);
printk("btrfs unloaded\n");

60
fs/btrfs/transaction.c
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@ -8,6 +8,8 @@ static int total_trans = 0;
extern struct kmem_cache *btrfs_trans_handle_cachep;
extern struct kmem_cache *btrfs_transaction_cachep;
static struct workqueue_struct *trans_wq;
#define BTRFS_ROOT_TRANS_TAG 0
#define TRANS_MAGIC 0xE1E10E
@ -44,6 +46,7 @@ static int join_transaction(struct btrfs_root *root)
cur_trans->in_commit = 0;
cur_trans->use_count = 1;
cur_trans->commit_done = 0;
cur_trans->start_time = get_seconds();
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
init_bit_radix(&cur_trans->dirty_pages);
}
@ -350,3 +353,60 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
return ret;
}
void btrfs_transaction_cleaner(struct work_struct *work)
{
struct btrfs_fs_info *fs_info = container_of(work,
struct btrfs_fs_info,
trans_work.work);
struct btrfs_root *root = fs_info->tree_root;
struct btrfs_transaction *cur;
struct btrfs_trans_handle *trans;
unsigned long now;
unsigned long delay = HZ * 30;
int ret;
printk("btrfs transaction cleaner\n");
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->trans_mutex);
cur = root->fs_info->running_transaction;
if (!cur) {
mutex_unlock(&root->fs_info->trans_mutex);
goto out;
}
now = get_seconds();
if (now < cur->start_time || now - cur->start_time < 30) {
mutex_unlock(&root->fs_info->trans_mutex);
delay = HZ * 5;
goto out;
}
mutex_unlock(&root->fs_info->trans_mutex);
printk("forcing commit\n");
trans = btrfs_start_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
out:
mutex_unlock(&root->fs_info->fs_mutex);
btrfs_transaction_queue_work(root, delay);
}
void btrfs_transaction_queue_work(struct btrfs_root *root, int delay)
{
queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay);
}
void btrfs_transaction_flush_work(struct btrfs_root *root)
{
cancel_rearming_delayed_workqueue(trans_wq, &root->fs_info->trans_work);
flush_workqueue(trans_wq);
}
void __init btrfs_init_transaction_sys(void)
{
trans_wq = create_workqueue("btrfs");
}
void __exit btrfs_exit_transaction_sys(void)
{
destroy_workqueue(trans_wq);
}

8
fs/btrfs/transaction.h
View File

@ -11,6 +11,7 @@ struct btrfs_transaction {
int magic;
struct list_head list;
struct radix_tree_root dirty_pages;
unsigned long start_time;
wait_queue_head_t writer_wait;
wait_queue_head_t commit_wait;
};
@ -47,4 +48,11 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
void btrfs_transaction_cleaner(struct work_struct *work);
void btrfs_transaction_flush_work(struct btrfs_root *root);
void btrfs_transaction_queue_work(struct btrfs_root *root, int delay);
void btrfs_init_transaction_sys(void);
void btrfs_exit_transaction_sys(void);
#endif