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Create a btrfs backing dev info
This allows intelligent versions of unplug and congestion functions Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
593060d756
commit
0416008814
3 changed files with 60 additions and 0 deletions
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@ -25,6 +25,7 @@
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#include <linux/fs.h>
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#include <linux/workqueue.h>
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#include <linux/completion.h>
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#include <linux/backing-dev.h>
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#include <asm/kmap_types.h>
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#include "bit-radix.h"
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#include "extent_io.h"
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@ -472,6 +473,7 @@ struct btrfs_fs_info {
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struct block_device *__bdev;
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struct super_block *sb;
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struct inode *btree_inode;
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struct backing_dev_info bdi;
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spinlock_t hash_lock;
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struct mutex trans_mutex;
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struct mutex fs_mutex;
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@ -655,6 +655,55 @@ static int add_hasher(struct btrfs_fs_info *info, char *type) {
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return 0;
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}
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#endif
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static int btrfs_congested_fn(void *congested_data, int bdi_bits)
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{
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struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
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int ret = 0;
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struct list_head *cur;
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struct btrfs_device *device;
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struct backing_dev_info *bdi;
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list_for_each(cur, &info->fs_devices->devices) {
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device = list_entry(cur, struct btrfs_device, dev_list);
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bdi = blk_get_backing_dev_info(device->bdev);
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if (bdi && bdi_congested(bdi, bdi_bits)) {
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ret = 1;
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break;
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}
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}
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return ret;
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}
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void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
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{
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struct list_head *cur;
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struct btrfs_device *device;
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struct btrfs_fs_info *info;
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info = (struct btrfs_fs_info *)bdi->unplug_io_data;
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list_for_each(cur, &info->fs_devices->devices) {
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device = list_entry(cur, struct btrfs_device, dev_list);
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bdi = blk_get_backing_dev_info(device->bdev);
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if (bdi->unplug_io_fn) {
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bdi->unplug_io_fn(bdi, page);
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}
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}
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}
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static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
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{
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bdi_init(bdi);
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bdi->ra_pages = default_backing_dev_info.ra_pages;
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bdi->state = 0;
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bdi->capabilities = default_backing_dev_info.capabilities;
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bdi->unplug_io_fn = btrfs_unplug_io_fn;
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bdi->unplug_io_data = info;
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bdi->congested_fn = btrfs_congested_fn;
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bdi->congested_data = info;
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return 0;
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}
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struct btrfs_root *open_ctree(struct super_block *sb,
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struct btrfs_fs_devices *fs_devices)
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{
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@ -708,11 +757,14 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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fs_info->max_extent = (u64)-1;
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fs_info->max_inline = 8192 * 1024;
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fs_info->delalloc_bytes = 0;
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setup_bdi(fs_info, &fs_info->bdi);
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fs_info->btree_inode = new_inode(sb);
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fs_info->btree_inode->i_ino = 1;
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fs_info->btree_inode->i_nlink = 1;
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fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
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fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
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fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
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extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
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fs_info->btree_inode->i_mapping,
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GFP_NOFS);
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@ -992,6 +1044,7 @@ int close_ctree(struct btrfs_root *root)
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#endif
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close_all_devices(fs_info);
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btrfs_mapping_tree_free(&fs_info->mapping_tree);
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bdi_destroy(&fs_info->bdi);
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kfree(fs_info->extent_root);
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kfree(fs_info->tree_root);
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@ -494,6 +494,7 @@ void btrfs_read_locked_inode(struct inode *inode)
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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inode->i_mapping->a_ops = &btrfs_aops;
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inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
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BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
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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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@ -508,6 +509,7 @@ void btrfs_read_locked_inode(struct inode *inode)
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case S_IFLNK:
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inode->i_op = &btrfs_symlink_inode_operations;
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inode->i_mapping->a_ops = &btrfs_symlink_aops;
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inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
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break;
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default:
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init_special_inode(inode, inode->i_mode, rdev);
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@ -1792,6 +1794,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
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drop_inode = 1;
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else {
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inode->i_mapping->a_ops = &btrfs_aops;
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inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
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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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extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
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@ -2960,6 +2963,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
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drop_inode = 1;
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else {
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inode->i_mapping->a_ops = &btrfs_aops;
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inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
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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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extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
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@ -2999,6 +3003,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
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inode->i_op = &btrfs_symlink_inode_operations;
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inode->i_mapping->a_ops = &btrfs_symlink_aops;
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inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
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inode->i_size = name_len - 1;
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err = btrfs_update_inode(trans, root, inode);
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if (err)
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