jbd2: make jbd2_handle_buffer_credits() handle reserved handles
commit3c845acd0237caef617f330a0e3b37ad8ae9fea5
authorJan Kara <jack@suse.cz>
Fri, 15 Nov 2019 10:22:10 +0000 (15 11:22 +0100)
committerTheodore Ts'o <tytso@mit.edu>
Fri, 15 Nov 2019 14:23:03 +0000 (15 09:23 -0500)
tree463edd05db61fcd4305bb928bfb90086bd9c31be
parent565333a1554d704789e74205989305c811fd9c7a
jbd2: make jbd2_handle_buffer_credits() handle reserved handles

The helper jbd2_handle_buffer_credits() doesn't correctly handle reserved
handles which can lead to crashes. Fix it getting of journal pointer to
work for reserved handles as well.

Fixes: a9a8344ee171 ("ext4, jbd2: Provide accessor function for handle credits")
Reported-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191115102210.29445-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
include/linux/jbd2.h