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| author | Chris Mason <chris.mason@oracle.com> | 2007-11-26 16:34:41 -0800 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:03:58 -0400 |
| commit | 793955bca66c99defdffc857ae6eb7e8431d6bbe (patch) | |
| tree | 2f8376247033fced7289038b8d82e10a6cc55f22 /fs/btrfs/disk-io.c | |
| parent | 015a739c7c238768fbfa4eea8ea2ebc1a35e7bb1 (diff) | |
| download | linux-793955bca66c99defdffc857ae6eb7e8431d6bbe.tar.gz | |
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.c | 9 |
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, { 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); } |