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authorChris Mason <chris.mason@oracle.com>2008-06-25 16:01:30 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:03 -0400
commit925baeddc5b0764a53f2214a1253251bab0e0324 (patch)
tree0e069bf9cc1c4ecd17c812fd1fb81bf807909ee6 /fs/btrfs/extent_io.c
parent1cc127b5d1b71453091859301de4a7dd6ee96fa8 (diff)
Btrfs: Start btree concurrency work.
The allocation trees and the chunk trees are serialized via their own dedicated mutexes. This means allocation location is still not very fine grained. The main FS btree is protected by locks on each block in the btree. Locks are taken top / down, and as processing finishes on a given level of the tree, the lock is released after locking the lower level. The end result of a search is now a path where only the lowest level is locked. Releasing or freeing the path drops any locks held. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.c')
-rw-r--r--fs/btrfs/extent_io.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 17c508a941e..bd15cdcaba9 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2889,7 +2889,6 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
- lock_page(page);
if (i == 0)
set_page_extent_head(page, eb->len);
else
@@ -2907,7 +2906,6 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
end = start + PAGE_CACHE_SIZE - 1;
if (test_range_bit(tree, start, end,
EXTENT_DIRTY, 0)) {
- unlock_page(page);
continue;
}
}
@@ -2919,7 +2917,6 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
PAGECACHE_TAG_DIRTY);
}
read_unlock_irq(&page->mapping->tree_lock);
- unlock_page(page);
}
return 0;
}
@@ -2948,17 +2945,12 @@ int set_extent_buffer_dirty(struct extent_io_tree *tree,
* on us if the page isn't already dirty.
*/
if (i == 0) {
- lock_page(page);
set_page_extent_head(page, eb->len);
} else if (PagePrivate(page) &&
page->private != EXTENT_PAGE_PRIVATE) {
- lock_page(page);
set_page_extent_mapped(page);
- unlock_page(page);
}
__set_page_dirty_nobuffers(extent_buffer_page(eb, i));
- if (i == 0)
- unlock_page(page);
}
return set_extent_dirty(tree, eb->start,
eb->start + eb->len - 1, GFP_NOFS);