From: Nikolay Borisov <nborisov@suse.com>
To: Qu Wenruo <wqu@suse.com>, linux-btrfs@vger.kernel.org
Cc: David Sterba <dsterba@suse.com>
Subject: Re: [PATCH 02/32] btrfs: extent_io: integrate page status update into endio_readpage_release_extent()
Date: Thu, 5 Nov 2020 12:35:31 +0200 [thread overview]
Message-ID: <17f71e81-6cb4-d37e-2915-1f5e0fb2ab59@suse.com> (raw)
In-Reply-To: <20201103133108.148112-3-wqu@suse.com>
On 3.11.20 г. 15:30 ч., Qu Wenruo wrote:
> In end_bio_extent_readpage(), we set page uptodate or error according to
> the bio status. However that assumes all submitted reads are in page
> size.
>
> To support case like subpage read, we should only set the whole page
> uptodate if all data in the page have been read from disk.
>
> This patch will integrate the page status update into
> endio_readpage_release_extent() for end_bio_extent_readpage().
>
> Now in endio_readpage_release_extent() we will set the page uptodate if:
>
> - start/end range covers the full page
> This is the existing behavior already.
>
> - the whole page range is already uptodate
> This adds the support for subpage read.
>
> And for the error path, we always clear the page uptodate and set the
> page error.
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
> Signed-off-by: David Sterba <dsterba@suse.com>
> ---
> fs/btrfs/extent_io.c | 38 ++++++++++++++++++++++++++++----------
> 1 file changed, 28 insertions(+), 10 deletions(-)
>
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index 58dc55e1429d..228bf0c5f7a0 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -2779,13 +2779,35 @@ static void end_bio_extent_writepage(struct bio *bio)
> bio_put(bio);
> }
>
> -static void endio_readpage_release_extent(struct extent_io_tree *tree, u64 start,
> - u64 end, int uptodate)
> +static void endio_readpage_release_extent(struct extent_io_tree *tree,
> + struct page *page, u64 start, u64 end, int uptodate)
> {
> struct extent_state *cached = NULL;
>
> - if (uptodate && tree->track_uptodate)
> - set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC);
> + if (uptodate) {
> + u64 page_start = page_offset(page);
> + u64 page_end = page_offset(page) + PAGE_SIZE - 1;
> +
> + if (tree->track_uptodate) {
> + /*
> + * The tree has EXTENT_UPTODATE bit tracking, update
> + * extent io tree, and use it to update the page if
> + * needed.
> + */
> + set_extent_uptodate(tree, start, end, &cached, GFP_NOFS);
> + check_page_uptodate(tree, page);
> + } else if (start <= page_start && end >= page_end) {
> + /* We have covered the full page, set it uptodate */
> + SetPageUptodate(page);
> + }
> + } else if (!uptodate){
> + if (tree->track_uptodate)
> + clear_extent_uptodate(tree, start, end, &cached);
Hm, that call to clear_extent_uptodate was absent before, so either:
a) The old code is buggy since it misses it
b) this will be a nullop because we have just read the extent and we
haven't really set it to uptodate so there won't be anything to clear?
Which is it?
<snip>
next prev parent reply other threads:[~2020-11-05 10:35 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-03 13:30 [PATCH 00/32] btrfs: preparation patches for subpage support Qu Wenruo
2020-11-03 13:30 ` [PATCH 01/32] btrfs: extent_io: remove the extent_start/extent_len for end_bio_extent_readpage() Qu Wenruo
2020-11-05 9:46 ` Nikolay Borisov
2020-11-05 10:15 ` Qu Wenruo
2020-11-05 10:32 ` Nikolay Borisov
2020-11-06 2:01 ` Qu Wenruo
2020-11-06 7:19 ` Qu Wenruo
2020-11-05 19:40 ` Josef Bacik
2020-11-06 1:52 ` Qu Wenruo
2020-11-03 13:30 ` [PATCH 02/32] btrfs: extent_io: integrate page status update into endio_readpage_release_extent() Qu Wenruo
2020-11-05 10:26 ` Nikolay Borisov
2020-11-05 11:15 ` Qu Wenruo
2020-11-05 10:35 ` Nikolay Borisov [this message]
2020-11-05 11:25 ` Qu Wenruo
2020-11-05 19:34 ` Josef Bacik
2020-11-03 13:30 ` [PATCH 03/32] btrfs: extent_io: add lockdep_assert_held() for attach_extent_buffer_page() Qu Wenruo
2020-11-03 13:30 ` [PATCH 04/32] btrfs: extent_io: extract the btree page submission code into its own helper function Qu Wenruo
2020-11-05 10:47 ` Nikolay Borisov
2020-11-06 18:11 ` David Sterba
2020-11-03 13:30 ` [PATCH 05/32] btrfs: extent-io-tests: remove invalid tests Qu Wenruo
2020-11-03 13:30 ` [PATCH 06/32] btrfs: extent_io: calculate inline extent buffer page size based on page size Qu Wenruo
2020-11-05 12:54 ` Nikolay Borisov
2020-11-03 13:30 ` [PATCH 07/32] btrfs: extent_io: make btrfs_fs_info::buffer_radix to take sector size devided values Qu Wenruo
2020-11-03 13:30 ` [PATCH 08/32] btrfs: extent_io: sink less common parameters for __set_extent_bit() Qu Wenruo
2020-11-05 13:35 ` Nikolay Borisov
2020-11-05 13:55 ` Qu Wenruo
2020-11-03 13:30 ` [PATCH 09/32] btrfs: extent_io: sink less common parameters for __clear_extent_bit() Qu Wenruo
2020-11-03 13:30 ` [PATCH 10/32] btrfs: disk_io: grab fs_info from extent_buffer::fs_info directly for btrfs_mark_buffer_dirty() Qu Wenruo
2020-11-05 13:45 ` Nikolay Borisov
2020-11-05 13:49 ` Nikolay Borisov
2020-11-03 13:30 ` [PATCH 11/32] btrfs: disk-io: make csum_tree_block() handle sectorsize smaller than page size Qu Wenruo
2020-11-06 18:58 ` David Sterba
2020-11-07 0:04 ` Qu Wenruo
2020-11-10 14:33 ` David Sterba
2020-11-11 0:08 ` Qu Wenruo
2020-11-03 13:30 ` [PATCH 12/32] btrfs: disk-io: extract the extent buffer verification from btrfs_validate_metadata_buffer() Qu Wenruo
2020-11-05 13:57 ` Nikolay Borisov
2020-11-06 19:03 ` David Sterba
2020-11-09 6:44 ` Qu Wenruo
2020-11-10 14:37 ` David Sterba
2020-11-03 13:30 ` [PATCH 13/32] btrfs: disk-io: accept bvec directly for csum_dirty_buffer() Qu Wenruo
2020-11-05 14:13 ` Nikolay Borisov
2020-11-03 13:30 ` [PATCH 14/32] btrfs: inode: make btrfs_readpage_end_io_hook() follow sector size Qu Wenruo
2020-11-05 14:28 ` Nikolay Borisov
2020-11-06 19:16 ` David Sterba
2020-11-06 19:20 ` David Sterba
2020-11-06 19:28 ` David Sterba
2020-11-03 13:30 ` [PATCH 15/32] btrfs: introduce a helper to determine if the sectorsize is smaller than PAGE_SIZE Qu Wenruo
2020-11-05 15:01 ` Nikolay Borisov
2020-11-05 22:52 ` Qu Wenruo
2020-11-06 17:28 ` David Sterba
2020-11-07 0:00 ` Qu Wenruo
2020-11-10 14:53 ` David Sterba
2020-11-11 1:34 ` Qu Wenruo
2020-11-11 2:21 ` Qu Wenruo
2020-11-03 13:30 ` [PATCH 16/32] btrfs: extent_io: allow find_first_extent_bit() to find a range with exact bits match Qu Wenruo
2020-11-05 15:03 ` Nikolay Borisov
2020-11-05 22:55 ` Qu Wenruo
2020-11-03 13:30 ` [PATCH 17/32] btrfs: extent_io: don't allow tree block to cross page boundary for subpage support Qu Wenruo
2020-11-06 11:54 ` Nikolay Borisov
2020-11-06 12:03 ` Nikolay Borisov
2020-11-06 13:25 ` Qu Wenruo
2020-11-06 14:04 ` Nikolay Borisov
2020-11-06 23:56 ` Qu Wenruo
2020-11-03 13:30 ` [PATCH 18/32] btrfs: extent_io: update num_extent_pages() to support subpage sized extent buffer Qu Wenruo
2020-11-06 12:09 ` Nikolay Borisov
2020-11-03 13:30 ` [PATCH 19/32] btrfs: handle sectorsize < PAGE_SIZE case for extent buffer accessors Qu Wenruo
2020-11-06 12:51 ` Nikolay Borisov
2020-11-09 5:49 ` Qu Wenruo
2020-11-03 13:30 ` [PATCH 20/32] btrfs: disk-io: only clear EXTENT_LOCK bit for extent_invalidatepage() Qu Wenruo
2020-11-06 13:17 ` Nikolay Borisov
2020-11-03 13:30 ` [PATCH 21/32] btrfs: extent-io: make type of extent_state::state to be at least 32 bits Qu Wenruo
2020-11-06 13:38 ` Nikolay Borisov
2020-11-03 13:30 ` [PATCH 22/32] btrfs: file-item: use nodesize to determine whether we need readahead for btrfs_lookup_bio_sums() Qu Wenruo
2020-11-06 13:55 ` Nikolay Borisov
2020-11-03 13:30 ` [PATCH 23/32] btrfs: file-item: remove the btrfs_find_ordered_sum() call in btrfs_lookup_bio_sums() Qu Wenruo
2020-11-06 14:28 ` Nikolay Borisov
2020-11-03 13:31 ` [PATCH 24/32] btrfs: file-item: refactor btrfs_lookup_bio_sums() to handle out-of-order bvecs Qu Wenruo
2020-11-06 15:22 ` Nikolay Borisov
2020-11-03 13:31 ` [PATCH 25/32] btrfs: scrub: distinguish scrub_page from regular page Qu Wenruo
2020-11-03 13:31 ` [PATCH 26/32] btrfs: scrub: remove the @force parameter of scrub_pages() Qu Wenruo
2020-11-03 13:31 ` [PATCH 27/32] btrfs: scrub: use flexible array for scrub_page::csums Qu Wenruo
2020-11-09 17:44 ` David Sterba
2020-11-10 0:53 ` Qu Wenruo
2020-11-10 14:22 ` David Sterba
2020-11-03 13:31 ` [PATCH 28/32] btrfs: scrub: refactor scrub_find_csum() Qu Wenruo
2020-11-03 13:31 ` [PATCH 29/32] btrfs: scrub: introduce scrub_page::page_len for subpage support Qu Wenruo
2020-11-09 18:17 ` David Sterba
2020-11-10 0:54 ` Qu Wenruo
2020-11-09 18:25 ` David Sterba
2020-11-10 0:56 ` Qu Wenruo
2020-11-10 14:27 ` David Sterba
2020-11-03 13:31 ` [PATCH 30/32] btrfs: scrub: always allocate one full page for one sector for RAID56 Qu Wenruo
2020-11-03 13:31 ` [PATCH 31/32] btrfs: scrub: support subpage tree block scrub Qu Wenruo
2020-11-09 18:31 ` David Sterba
2020-11-03 13:31 ` [PATCH 32/32] btrfs: scrub: support subpage data scrub Qu Wenruo
2020-11-05 19:28 ` [PATCH 00/32] btrfs: preparation patches for subpage support Josef Bacik
2020-11-06 0:02 ` Qu Wenruo
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