On Mon, Jun 12, 2017 at 05:29:41PM +0200, David Sterba wrote:
> We can hardcode GFP_NOFS to btrfs_io_bio_alloc, although it means we
> change it back from GFP_KERNEL in scrub. I'd rather save a few stack
> bytes from not passing the gfp flags in the remaining, more imporatant,
> contexts and the bio allocating API now looks more consistent.
>
Reviewed-by: Liu Bo <bo.li....@oracle.com>
-liubo
> Signed-off-by: David Sterba <dste...@suse.com>
> ---
> fs/btrfs/check-integrity.c | 2 +-
> fs/btrfs/disk-io.c | 2 +-
> fs/btrfs/extent_io.c | 8 ++++----
> fs/btrfs/extent_io.h | 2 +-
> fs/btrfs/raid56.c | 2 +-
> fs/btrfs/scrub.c | 16 +++++++---------
> 6 files changed, 15 insertions(+), 17 deletions(-)
>
> diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
> index 160879c802d0..e3b1d08dd03c 100644
> --- a/fs/btrfs/check-integrity.c
> +++ b/fs/btrfs/check-integrity.c
> @@ -1638,7 +1638,7 @@ static int btrfsic_read_block(struct btrfsic_state
> *state,
> struct bio *bio;
> unsigned int j;
>
> - bio = btrfs_io_bio_alloc(GFP_NOFS, num_pages - i);
> + bio = btrfs_io_bio_alloc(num_pages - i);
> bio->bi_bdev = block_ctx->dev->bdev;
> bio->bi_iter.bi_sector = dev_bytenr >> 9;
> bio_set_op_attrs(bio, REQ_OP_READ, 0);
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 9f2ffe2c6afb..8b57c280e5cd 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -3532,7 +3532,7 @@ static int write_dev_flush(struct btrfs_device *device,
> int wait)
> * caller
> */
> device->flush_bio = NULL;
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
> + bio = btrfs_io_bio_alloc(0);
> bio->bi_end_io = btrfs_end_empty_barrier;
> bio->bi_bdev = device->bdev;
> bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index cbd0a9a1daa5..29a6111a68d2 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -1987,7 +1987,7 @@ int repair_io_failure(struct btrfs_fs_info *fs_info,
> u64 ino, u64 start,
> ASSERT(!(fs_info->sb->s_flags & MS_RDONLY));
> BUG_ON(!mirror_num);
>
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
> + bio = btrfs_io_bio_alloc(1);
> bio->bi_iter.bi_size = 0;
> map_length = length;
>
> @@ -2331,7 +2331,7 @@ struct bio *btrfs_create_repair_bio(struct inode
> *inode, struct bio *failed_bio,
> struct btrfs_io_bio *btrfs_failed_bio;
> struct btrfs_io_bio *btrfs_bio;
>
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
> + bio = btrfs_io_bio_alloc(1);
> bio->bi_end_io = endio_func;
> bio->bi_iter.bi_sector = failrec->logical >> 9;
> bio->bi_bdev = fs_info->fs_devices->latest_bdev;
> @@ -2692,12 +2692,12 @@ struct bio *btrfs_bio_clone(struct bio *bio)
> return new;
> }
>
> -struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
> +struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs)
> {
> struct bio *bio;
>
> /* Bio allocation backed by a bioset does not fail */
> - bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset);
> + bio = bio_alloc_bioset(GFP_NOFS, nr_iovecs, btrfs_bioset);
> btrfs_io_bio_init(btrfs_io_bio(bio));
> return bio;
> }
> diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
> index 8071e3977614..1e508a8f876e 100644
> --- a/fs/btrfs/extent_io.h
> +++ b/fs/btrfs/extent_io.h
> @@ -463,7 +463,7 @@ void extent_clear_unlock_delalloc(struct inode *inode,
> u64 start, u64 end,
> unsigned bits_to_clear,
> unsigned long page_ops);
> struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte);
> -struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
> +struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
> struct bio *btrfs_bio_clone(struct bio *bio);
> struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);
>
> diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
> index 7dd55448ac68..b9abb0b01021 100644
> --- a/fs/btrfs/raid56.c
> +++ b/fs/btrfs/raid56.c
> @@ -1098,7 +1098,7 @@ static int rbio_add_io_page(struct btrfs_raid_bio *rbio,
> }
>
> /* put a new bio on the list */
> - bio = btrfs_io_bio_alloc(GFP_NOFS, bio_max_len >> PAGE_SHIFT?:1);
> + bio = btrfs_io_bio_alloc(bio_max_len >> PAGE_SHIFT ?: 1);
> bio->bi_iter.bi_size = 0;
> bio->bi_bdev = stripe->dev->bdev;
> bio->bi_iter.bi_sector = disk_start >> 9;
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index 1e2dfea00b2f..58a249cd5adc 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -1737,7 +1737,7 @@ static void scrub_recheck_block(struct btrfs_fs_info
> *fs_info,
> }
>
> WARN_ON(!page->page);
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
> + bio = btrfs_io_bio_alloc(1);
> bio->bi_bdev = page->dev->bdev;
>
> bio_add_page(bio, page->page, PAGE_SIZE, 0);
> @@ -1825,7 +1825,7 @@ static int scrub_repair_page_from_good_copy(struct
> scrub_block *sblock_bad,
> return -EIO;
> }
>
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
> + bio = btrfs_io_bio_alloc(1);
> bio->bi_bdev = page_bad->dev->bdev;
> bio->bi_iter.bi_sector = page_bad->physical >> 9;
> bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
> @@ -1915,8 +1915,7 @@ static int scrub_add_page_to_wr_bio(struct scrub_ctx
> *sctx,
> sbio->dev = sctx->wr_tgtdev;
> bio = sbio->bio;
> if (!bio) {
> - bio = btrfs_io_bio_alloc(GFP_KERNEL,
> - sctx->pages_per_wr_bio);
> + bio = btrfs_io_bio_alloc(sctx->pages_per_wr_bio);
> sbio->bio = bio;
> }
>
> @@ -2316,8 +2315,7 @@ static int scrub_add_page_to_rd_bio(struct scrub_ctx
> *sctx,
> sbio->dev = spage->dev;
> bio = sbio->bio;
> if (!bio) {
> - bio = btrfs_io_bio_alloc(GFP_KERNEL,
> - sctx->pages_per_rd_bio);
> + bio = btrfs_io_bio_alloc(sctx->pages_per_rd_bio);
> sbio->bio = bio;
> }
>
> @@ -2443,7 +2441,7 @@ static void scrub_missing_raid56_pages(struct
> scrub_block *sblock)
> goto bbio_out;
> }
>
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
> + bio = btrfs_io_bio_alloc(0);
> bio->bi_iter.bi_sector = logical >> 9;
> bio->bi_private = sblock;
> bio->bi_end_io = scrub_missing_raid56_end_io;
> @@ -3019,7 +3017,7 @@ static void scrub_parity_check_and_repair(struct
> scrub_parity *sparity)
> if (ret || !bbio || !bbio->raid_map)
> goto bbio_out;
>
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
> + bio = btrfs_io_bio_alloc(0);
> bio->bi_iter.bi_sector = sparity->logic_start >> 9;
> bio->bi_private = sparity;
> bio->bi_end_io = scrub_parity_bio_endio;
> @@ -4626,7 +4624,7 @@ static int write_page_nocow(struct scrub_ctx *sctx,
> "scrub write_page_nocow(bdev == NULL) is unexpected");
> return -EIO;
> }
> - bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
> + bio = btrfs_io_bio_alloc(1);
> bio->bi_iter.bi_size = 0;
> bio->bi_iter.bi_sector = physical_for_dev_replace >> 9;
> bio->bi_bdev = dev->bdev;
> --
> 2.13.0
>
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