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Commit 04160088 authored by Chris Mason's avatar Chris Mason
Browse files

Create a btrfs backing dev info 



This allows intelligent versions of unplug and congestion functions

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 593060d7

fs/btrfs/ctree.h

+2 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/fs.h>

#include <linux/workqueue.h>

#include <linux/completion.h>

#include <linux/backing-dev.h>

#include <asm/kmap_types.h>

#include "bit-radix.h"

#include "extent_io.h"
@@ -472,6 +473,7 @@ struct btrfs_fs_info { 
	struct block_device *__bdev;

	struct super_block *sb;

	struct inode *btree_inode;

	struct backing_dev_info bdi;

	spinlock_t hash_lock;

	struct mutex trans_mutex;

	struct mutex fs_mutex;

fs/btrfs/disk-io.c

+53 −0
Original line number Diff line number Diff line
@@ -655,6 +655,55 @@ static int add_hasher(struct btrfs_fs_info *info, char *type) { 
	return 0;

}

#endif



static int btrfs_congested_fn(void *congested_data, int bdi_bits)

{

	struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;

	int ret = 0;

	struct list_head *cur;

	struct btrfs_device *device;

	struct backing_dev_info *bdi;



	list_for_each(cur, &info->fs_devices->devices) {

		device = list_entry(cur, struct btrfs_device, dev_list);

		bdi = blk_get_backing_dev_info(device->bdev);

		if (bdi && bdi_congested(bdi, bdi_bits)) {

			ret = 1;

			break;

		}

	}

	return ret;

}



void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)

{

	struct list_head *cur;

	struct btrfs_device *device;

	struct btrfs_fs_info *info;



	info = (struct btrfs_fs_info *)bdi->unplug_io_data;

	list_for_each(cur, &info->fs_devices->devices) {

		device = list_entry(cur, struct btrfs_device, dev_list);

		bdi = blk_get_backing_dev_info(device->bdev);

		if (bdi->unplug_io_fn) {

			bdi->unplug_io_fn(bdi, page);

		}

	}

}



static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)

{

	bdi_init(bdi);

	bdi->ra_pages	= default_backing_dev_info.ra_pages;

	bdi->state		= 0;

	bdi->capabilities	= default_backing_dev_info.capabilities;

	bdi->unplug_io_fn	= btrfs_unplug_io_fn;

	bdi->unplug_io_data	= info;

	bdi->congested_fn	= btrfs_congested_fn;

	bdi->congested_data	= info;

	return 0;

}



struct btrfs_root *open_ctree(struct super_block *sb,

			      struct btrfs_fs_devices *fs_devices)

{
@@ -708,11 +757,14 @@ struct btrfs_root *open_ctree(struct super_block *sb, 
	fs_info->max_extent = (u64)-1;

	fs_info->max_inline = 8192 * 1024;

	fs_info->delalloc_bytes = 0;

	setup_bdi(fs_info, &fs_info->bdi);

	fs_info->btree_inode = new_inode(sb);

	fs_info->btree_inode->i_ino = 1;

	fs_info->btree_inode->i_nlink = 1;

	fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;

	fs_info->btree_inode->i_mapping->a_ops = &btree_aops;

	fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;



	extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,

			     fs_info->btree_inode->i_mapping,

			     GFP_NOFS);
@@ -992,6 +1044,7 @@ int close_ctree(struct btrfs_root *root) 
#endif

	close_all_devices(fs_info);

	btrfs_mapping_tree_free(&fs_info->mapping_tree);

	bdi_destroy(&fs_info->bdi);



	kfree(fs_info->extent_root);

	kfree(fs_info->tree_root);

fs/btrfs/inode.c

+5 −0
Original line number Diff line number Diff line
@@ -494,6 +494,7 @@ void btrfs_read_locked_inode(struct inode *inode) 
	switch (inode->i_mode & S_IFMT) {

	case S_IFREG:

		inode->i_mapping->a_ops = &btrfs_aops;

		inode->i_mapping->backing_dev_info = &root->fs_info->bdi;

		BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;

		inode->i_fop = &btrfs_file_operations;

		inode->i_op = &btrfs_file_inode_operations;
@@ -508,6 +509,7 @@ void btrfs_read_locked_inode(struct inode *inode) 
	case S_IFLNK:

		inode->i_op = &btrfs_symlink_inode_operations;

		inode->i_mapping->a_ops = &btrfs_symlink_aops;

		inode->i_mapping->backing_dev_info = &root->fs_info->bdi;

		break;

	default:

		init_special_inode(inode, inode->i_mode, rdev);
@@ -1792,6 +1794,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry, 
		drop_inode = 1;

	else {

		inode->i_mapping->a_ops = &btrfs_aops;

		inode->i_mapping->backing_dev_info = &root->fs_info->bdi;

		inode->i_fop = &btrfs_file_operations;

		inode->i_op = &btrfs_file_inode_operations;

		extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
@@ -2960,6 +2963,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, 
		drop_inode = 1;

	else {

		inode->i_mapping->a_ops = &btrfs_aops;

		inode->i_mapping->backing_dev_info = &root->fs_info->bdi;

		inode->i_fop = &btrfs_file_operations;

		inode->i_op = &btrfs_file_inode_operations;

		extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
@@ -2999,6 +3003,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, 


	inode->i_op = &btrfs_symlink_inode_operations;

	inode->i_mapping->a_ops = &btrfs_symlink_aops;

	inode->i_mapping->backing_dev_info = &root->fs_info->bdi;

	inode->i_size = name_len - 1;

	err = btrfs_update_inode(trans, root, inode);

	if (err)