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Btrfs: Throttle file_write when data=ordered is flushing the inode 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-25 08:51:48 -04:00
parent bce4eae986
commit 81d7ed29ff
6 changed files with 28 additions and 2 deletions
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1
fs/btrfs/btrfs_inode.h
View File

@ -31,6 +31,7 @@ struct btrfs_inode {
struct extent_io_tree io_tree;
struct extent_io_tree io_failure_tree;
struct inode vfs_inode;
atomic_t ordered_writeback;
u64 ordered_trans;
/*

1
fs/btrfs/file.c
View File

@ -977,6 +977,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
(start_pos + num_written - 1) >> PAGE_CACHE_SHIFT);
}
current->backing_dev_info = NULL;
btrfs_ordered_throttle(root, inode);
return num_written ? num_written : err;
}

4
fs/btrfs/inode.c
View File

@ -1419,6 +1419,7 @@ static int btrfs_init_locked_inode(struct inode *inode, void *p)
inode->i_mapping, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
return 0;
}
@ -1728,6 +1729,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
inode->i_mapping, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
BTRFS_I(inode)->delalloc_bytes = 0;
BTRFS_I(inode)->root = root;
@ -1956,6 +1958,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->delalloc_bytes = 0;
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
}
dir->i_sb->s_dirt = 1;
@ -3292,6 +3295,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->delalloc_bytes = 0;
atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
}
dir->i_sb->s_dirt = 1;

13
fs/btrfs/ordered-data.c
View File

@ -269,3 +269,16 @@ int btrfs_del_ordered_inode(struct inode *inode)
return ret;
}
int btrfs_ordered_throttle(struct btrfs_root *root, struct inode *inode)
{
struct btrfs_transaction *cur = root->fs_info->running_transaction;
while(cur == root->fs_info->running_transaction &&
atomic_read(&BTRFS_I(inode)->ordered_writeback)) {
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
congestion_wait(WRITE, HZ/20);
#else
blk_congestion_wait(WRITE, HZ/20);
#endif
}
return 0;
}

1
fs/btrfs/ordered-data.h
View File

@ -39,4 +39,5 @@ int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
u64 *root_objectid, u64 *objectid,
struct inode **inode);
int btrfs_del_ordered_inode(struct inode *inode);
int btrfs_ordered_throttle(struct btrfs_root *root, struct inode *inode);
#endif

10
fs/btrfs/transaction.c
View File

@ -512,8 +512,11 @@ int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans,
mutex_unlock(&root->fs_info->trans_mutex);
mutex_unlock(&root->fs_info->fs_mutex);
if (S_ISREG(inode->i_mode))
if (S_ISREG(inode->i_mode)) {
atomic_inc(&BTRFS_I(inode)->ordered_writeback);
filemap_fdatawrite(inode->i_mapping);
atomic_dec(&BTRFS_I(inode)->ordered_writeback);
}
iput(inode);
mutex_lock(&root->fs_info->fs_mutex);
@ -530,8 +533,11 @@ int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans,
mutex_unlock(&root->fs_info->trans_mutex);
mutex_unlock(&root->fs_info->fs_mutex);
if (S_ISREG(inode->i_mode))
if (S_ISREG(inode->i_mode)) {
atomic_inc(&BTRFS_I(inode)->ordered_writeback);
filemap_write_and_wait(inode->i_mapping);
atomic_dec(&BTRFS_I(inode)->ordered_writeback);
}
atomic_dec(&inode->i_count);
iput(inode);