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authorChris Mason <chris.mason@oracle.com>2007-11-26 19:34:41 -0500
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:03:58 -0400
commit793955bca66c99defdffc857ae6eb7e8431d6bbe (patch)
tree2f8376247033fced7289038b8d82e10a6cc55f22 /fs/btrfs/disk-io.c
parent015a739c7c238768fbfa4eea8ea2ebc1a35e7bb1 (diff)
Btrfs: Limit btree writeback to prevent seeks
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3e16cca72b49..28e9ef8a3253 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -210,6 +210,15 @@ static int btree_writepages(struct address_space *mapping,
210{ 210{
211 struct extent_map_tree *tree; 211 struct extent_map_tree *tree;
212 tree = &BTRFS_I(mapping->host)->extent_tree; 212 tree = &BTRFS_I(mapping->host)->extent_tree;
213 if (wbc->sync_mode == WB_SYNC_NONE) {
214 u64 num_dirty;
215 u64 start = 0;
216 unsigned long thresh = 96 * 1024 * 1024;
217 num_dirty = count_range_bits(tree, &start, thresh, EXTENT_DIRTY);
218 if (num_dirty < thresh) {
219 return 0;
220 }
221 }
213 return extent_writepages(tree, mapping, btree_get_extent, wbc); 222 return extent_writepages(tree, mapping, btree_get_extent, wbc);
214} 223}
215 224