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Btrfs: fix punch hole when no extent exists 

I saw the warning in btrfs_drop_extent_cache where our end is less than our
start while running xfstests 68 in a loop.  This is because we
unconditionally do drop_end = min(end, extent_end) in
__btrfs_drop_extents(), even though we may not have found an extent in the
range we were looking to drop.  So keep track of wether or not we found
something, and if we didn't just use our end.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2012-09-14 14:51:22 -04:00 committed by Chris Mason
parent 926ced123b
commit c3308f84c1
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/file.c
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@ -609,6 +609,7 @@ int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
int ret;
int modify_tree = -1;
int update_refs = (root->ref_cows || root == root->fs_info->tree_root);
int found = 0;
if (drop_cache)
btrfs_drop_extent_cache(inode, start, end - 1, 0);
@ -674,6 +675,7 @@ next_slot:
goto next_slot;
}
found = 1;
search_start = max(key.offset, start);
if (recow || !modify_tree) {
modify_tree = -1;
@ -829,7 +831,7 @@ next_slot:
}
if (drop_end)
*drop_end = min(end, extent_end);
*drop_end = found ? min(end, extent_end) : end;
btrfs_release_path(path);
return ret;
}