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Btrfs: use a cached state for extent state operations during delalloc

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This changes the btrfs code to find delalloc ranges in the extent state
tree to use the new state caching code from set/test bit.  It reduces
one of the biggest causes of rbtree searches in the writeback path.

test_range_bit is also modified to take the cached state as a starting
point while searching.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2009-09-02 15:22:30 -04:00
parent d5550c6315
commit 9655d2982b
5 changed files with 40 additions and 24 deletions
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fs/btrfs/ordered-data.c
+4 -4
View File
@@ -262,7 +262,7 @@ int btrfs_dec_test_ordered_pending(struct inode *inode,
ret = test_range_bit(io_tree, entry->file_offset,
entry->file_offset + entry->len - 1,
EXTENT_ORDERED, 0);
EXTENT_ORDERED, 0, NULL);
if (ret == 0)
ret = test_and_set_bit(BTRFS_ORDERED_IO_DONE, &entry->flags);
out:
@@ -522,7 +522,7 @@ again:
end--;
}
if (test_range_bit(&BTRFS_I(inode)->io_tree, start, orig_end,
EXTENT_ORDERED | EXTENT_DELALLOC, 0)) {
EXTENT_ORDERED | EXTENT_DELALLOC, 0, NULL)) {
schedule_timeout(1);
goto again;
}
@@ -613,7 +613,7 @@ int btrfs_ordered_update_i_size(struct inode *inode,
*/
if (test_range_bit(io_tree, disk_i_size,
ordered->file_offset + ordered->len - 1,
EXTENT_DELALLOC, 0)) {
EXTENT_DELALLOC, 0, NULL)) {
goto out;
}
/*
@@ -664,7 +664,7 @@ int btrfs_ordered_update_i_size(struct inode *inode,
*/
if (i_size_test > entry_end(ordered) &&
!test_range_bit(io_tree, entry_end(ordered), i_size_test - 1,
EXTENT_DELALLOC, 0)) {
EXTENT_DELALLOC, 0, NULL)) {
new_i_size = min_t(u64, i_size_test, i_size_read(inode));
}
BTRFS_I(inode)->disk_i_size = new_i_size;