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authorMiao Xie <miaox@cn.fujitsu.com>2013-11-04 23:13:22 +0800
committerChris Mason <chris.mason@fusionio.com>2013-11-11 22:13:23 -0500
commit18cd8ea6df32e72548a4b055cba54d1a898c81e5 (patch)
tree7a3796ca5a384b2cff5900e0972d31d0af5a5b24 /fs/btrfs/extent-tree.c
parent38c135af8e22baf2ef3ebf9b213e398997a90946 (diff)
Btrfs: pick up the code for the item number calculation in flush_space()
This patch picked up the code that was used to calculate the number of the items for which we need reserve space, and we will use it in the next patch. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r--fs/btrfs/extent-tree.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2564cbfdf417..9183f9cbc121 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4022,6 +4022,18 @@ static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root,
}
}
+static inline int calc_reclaim_items_nr(struct btrfs_root *root, u64 to_reclaim)
+{
+ u64 bytes;
+ int nr;
+
+ bytes = btrfs_calc_trans_metadata_size(root, 1);
+ nr = (int)div64_u64(to_reclaim, bytes);
+ if (!nr)
+ nr = 1;
+ return nr;
+}
+
/*
* shrink metadata reservation for delalloc
*/
@@ -4167,16 +4179,11 @@ static int flush_space(struct btrfs_root *root,
switch (state) {
case FLUSH_DELAYED_ITEMS_NR:
case FLUSH_DELAYED_ITEMS:
- if (state == FLUSH_DELAYED_ITEMS_NR) {
- u64 bytes = btrfs_calc_trans_metadata_size(root, 1);
-
- nr = (int)div64_u64(num_bytes, bytes);
- if (!nr)
- nr = 1;
- nr *= 2;
- } else {
+ if (state == FLUSH_DELAYED_ITEMS_NR)
+ nr = calc_reclaim_items_nr(root, num_bytes) * 2;
+ else
nr = -1;
- }
+
trans = btrfs_join_transaction(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);