From: Naohiro Aota <naota@elisp.net>
Date: Tue, 30 Jun 2015 02:25:43 +0000 (+0900)
Subject: btrfs: fix search key advancing condition
X-Git-Tag: omap-for-v4.3/fixes-rc1~86^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dd81d459a37d73cfa39896bd070e7b92e66e3628;p=pandora-kernel.git

btrfs: fix search key advancing condition

The search key advancing condition used in copy_to_sk() is loose. It can
advance the key even if it reaches sk->max_*: e.g. when the max key = (512,
1024, -1) and the current key = (512, 1025, 10), it increments the
offset by 1, continues hopeless search from (512, 1025, 11). This issue
make ioctl() to take unexpectedly long time scanning all the leaf a blocks
one by one.

This commit fix the problem using standard way of key comparison:
btrfs_comp_cpu_keys()

Signed-off-by: Naohiro Aota <naota@elisp.net>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

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