From: Nikolay Borisov Subject: [PATCH 1/2] bufferhead: Add _gfp version for sb_getblk() Date: Tue, 30 Jun 2015 09:26:48 +0300 Message-ID: <1435645609-20387-1-git-send-email-kernel@kyup.com> Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org To: tytso@mit.edu, adilger.kernel@dilger.ca Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org sb_getblk() is used during ext4 (and possibly other FSes) writeback paths. Sometimes such path require allocating memory and guaranteeing that such allocation won't block. Currently, however, there is no way to provide user flags for sb_getblk which could lead to deadlocks. This patch implements a sb_getblk_gfp with the only difference it can accept user-provided GFP flags. Signed-off-by: Nikolay Borisov --- As per the discussion in this thread (http://marc.info/?l=linux-ext4&m=143563347324528&w=2) here are the patches which hopefully implement Ted's suggestion. include/linux/buffer_head.h | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 73b4522..e6797de 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -317,6 +317,13 @@ sb_getblk(struct super_block *sb, sector_t block) return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, __GFP_MOVABLE); } + +static inline struct buffer_head * +sb_getblk_gfp(struct super_block *sb, sector_t block, gfp_t gfp) +{ + return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, gfp); +} + static inline struct buffer_head * sb_find_get_block(struct super_block *sb, sector_t block) { -- 1.7.1