From 9be3395bcd4ad4af76476ac38152b4cafa6b6159 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Fri, 17 May 2013 18:30:14 -0400 Subject: Btrfs: use a btrfs bioset instead of abusing bio internals Btrfs has been pointer tagging bi_private and using bi_bdev to store the stripe index and mirror number of failed IOs. As bios bubble back up through the call chain, we use these to decide if and how to retry our IOs. They are also used to count IO failures on a per device basis. Recently a bio tracepoint was added lead to crashes because we were abusing bi_bdev. This commit adds a btrfs bioset, and creates explicit fields for the mirror number and stripe index. The plan is to extend this structure for all of the fields currently in struct btrfs_bio, which will mean one less kmalloc in our IO path. Signed-off-by: Chris Mason Reported-by: Tejun Heo --- fs/btrfs/extent_io.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/btrfs/extent_io.h') diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index a2c03a17500..41fb81e7ec5 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -336,6 +336,8 @@ int extent_clear_unlock_delalloc(struct inode *inode, struct bio * btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, gfp_t gfp_flags); +struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); +struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); struct btrfs_fs_info; -- cgit v1.2.3-70-g09d2