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/openbmc/linux/fs/btrfs/ |
H A D | subpage.h | 60e2d255 Mon May 31 03:50:39 CDT 2021 Qu Wenruo <wqu@suse.com> btrfs: provide btrfs_page_clamp_*() helpers
In the coming subpage RW supports, there are a lot of page status update calls which need to be converted to subpage compatible version, which needs @start and @len.
Some call sites already have such @start/@len and are already in page range, like various endio functions.
But there are also call sites which need to clamp the range for subpage case, like btrfs_dirty_pagse() and __process_contig_pages().
Here we introduce new helpers, btrfs_page_clamp_*(), to do and only do the clamp for subpage version.
Although in theory all existing btrfs_page_*() calls can be converted to use btrfs_page_clamp_*() directly, but that would make us to do unnecessary clamp operations.
Tested-by: Ritesh Harjani <riteshh@linux.ibm.com> # [ppc64] Tested-by: Anand Jain <anand.jain@oracle.com> # [aarch64] Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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H A D | subpage.c | 60e2d255 Mon May 31 03:50:39 CDT 2021 Qu Wenruo <wqu@suse.com> btrfs: provide btrfs_page_clamp_*() helpers
In the coming subpage RW supports, there are a lot of page status update calls which need to be converted to subpage compatible version, which needs @start and @len.
Some call sites already have such @start/@len and are already in page range, like various endio functions.
But there are also call sites which need to clamp the range for subpage case, like btrfs_dirty_pagse() and __process_contig_pages().
Here we introduce new helpers, btrfs_page_clamp_*(), to do and only do the clamp for subpage version.
Although in theory all existing btrfs_page_*() calls can be converted to use btrfs_page_clamp_*() directly, but that would make us to do unnecessary clamp operations.
Tested-by: Ritesh Harjani <riteshh@linux.ibm.com> # [ppc64] Tested-by: Anand Jain <anand.jain@oracle.com> # [aarch64] Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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