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Btrfs: Add efficient dirty accounting to the extent_map tree 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-11-27 11:16:35 -05:00
parent 448d640b66
commit ca6646264b
3 changed files with 36 additions and 4 deletions
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7
fs/btrfs/disk-io.c
View File

@ -210,7 +210,7 @@ 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 && current_is_pdflush()) {
if (wbc->sync_mode == WB_SYNC_NONE) {
u64 num_dirty;
u64 start = 0;
unsigned long thresh = 96 * 1024 * 1024;
@ -218,6 +218,11 @@ static int btree_writepages(struct address_space *mapping,
if (wbc->for_kupdate)
return 0;
if (current_is_pdflush()) {
thresh = 96 * 1024 * 1024;
} else {
thresh = 8 * 1024 * 1024;
}
num_dirty = count_range_bits(tree, &start, thresh, EXTENT_DIRTY);
if (num_dirty < thresh) {
return 0;

32
fs/btrfs/extent_map.c
View File

@ -42,6 +42,7 @@ struct extent_page_data {
struct extent_map_tree *tree;
get_extent_t *get_extent;
};
int __init extent_map_init(void)
{
extent_map_cache = btrfs_cache_create("extent_map",
@ -94,6 +95,7 @@ void extent_map_tree_init(struct extent_map_tree *tree,
tree->map.rb_node = NULL;
tree->state.rb_node = NULL;
tree->ops = NULL;
tree->dirty_bytes = 0;
rwlock_init(&tree->lock);
spin_lock_init(&tree->lru_lock);
tree->mapping = mapping;
@ -414,6 +416,8 @@ static int insert_state(struct extent_map_tree *tree,
printk("end < start %Lu %Lu\n", end, start);
WARN_ON(1);
}
if (bits & EXTENT_DIRTY)
tree->dirty_bytes += end - start + 1;
state->state |= bits;
state->start = start;
state->end = end;
@ -476,6 +480,12 @@ static int clear_state_bit(struct extent_map_tree *tree,
int delete)
{
int ret = state->state & bits;
if ((bits & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) {
u64 range = state->end - state->start + 1;
WARN_ON(range > tree->dirty_bytes);
tree->dirty_bytes -= range;
}
state->state &= ~bits;
if (wake)
wake_up(&state->wq);
@ -668,6 +678,17 @@ out:
}
EXPORT_SYMBOL(wait_extent_bit);
static void set_state_bits(struct extent_map_tree *tree,
struct extent_state *state,
int bits)
{
if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) {
u64 range = state->end - state->start + 1;
tree->dirty_bytes += range;
}
state->state |= bits;
}
/*
* set some bits on a range in the tree. This may require allocations
* or sleeping, so the gfp mask is used to indicate what is allowed.
@ -727,7 +748,7 @@ again:
err = -EEXIST;
goto out;
}
state->state |= bits;
set_state_bits(tree, state, bits);
start = state->end + 1;
merge_state(tree, state);
goto search_again;
@ -762,7 +783,7 @@ again:
if (err)
goto out;
if (state->end <= end) {
state->state |= bits;
set_state_bits(tree, state, bits);
start = state->end + 1;
merge_state(tree, state);
} else {
@ -808,7 +829,7 @@ again:
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
prealloc->state |= bits;
set_state_bits(tree, prealloc, bits);
merge_state(tree, prealloc);
prealloc = NULL;
goto out;
@ -1116,6 +1137,11 @@ u64 count_range_bits(struct extent_map_tree *tree,
int found = 0;
write_lock_irq(&tree->lock);
if (bits == EXTENT_DIRTY) {
*start = 0;
total_bytes = tree->dirty_bytes;
goto out;
}
/*
* this search will find all the extents that end after
* our range starts.

1
fs/btrfs/extent_map.h
View File

@ -40,6 +40,7 @@ struct extent_map_tree {
struct rb_root map;
struct rb_root state;
struct address_space *mapping;
u64 dirty_bytes;
rwlock_t lock;
struct extent_map_ops *ops;
spinlock_t lru_lock;