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Btrfs: Limit btree writeback to prevent seeks

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-11-26 16:34:41 -08:00
parent 015a739c7c
commit 793955bca6
3 changed files with 51 additions and 0 deletions
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9
fs/btrfs/disk-io.c
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@ -210,6 +210,15 @@ static int btree_writepages(struct address_space *mapping,
{
struct extent_map_tree *tree;
tree = &BTRFS_I(mapping->host)->extent_tree;
if (wbc->sync_mode == WB_SYNC_NONE) {
u64 num_dirty;
u64 start = 0;
unsigned long thresh = 96 * 1024 * 1024;
num_dirty = count_range_bits(tree, &start, thresh, EXTENT_DIRTY);
if (num_dirty < thresh) {
return 0;
}
}
return extent_writepages(tree, mapping, btree_get_extent, wbc);
}