Btrfs: look into the extent during find_all_leafs
authorJan Schmidt <list.btrfs@jan-o-sch.net>
Thu, 17 May 2012 14:43:03 +0000 (16:43 +0200)
committerJan Schmidt <list.btrfs@jan-o-sch.net>
Sat, 26 May 2012 10:17:52 +0000 (12:17 +0200)
commit976b1908d97bd8cbd024ba7aafaa3fb637ea8e13
tree77d53f8b40ea6a1692fbf93bdc2bbc0daf01e85c
parentd5c88b735fdf2ef796bb937396dd58dac84e8407
Btrfs: look into the extent during find_all_leafs

Before this patch we called find_all_leafs for a data extent, then called
find_all_roots and then looked into the extent to grab the information
we were seeking. This was done without holding the leaves locked to avoid
deadlocks. However, this can obviouly race with concurrent tree
modifications.

Instead, we now look into the extent while we're holding the lock during
find_all_leafs and store this information together with the leaf list.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
fs/btrfs/backref.c
fs/btrfs/backref.h