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Subject[PATCH 03/10] btrfs: use attach/detach_page_private
Date
Since the new pair function is introduced, we can call them to clean the
code in btrfs.

Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: David Sterba <dsterba@suse.com>
Cc: linux-btrfs@vger.kernel.org
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
---
No change since RFC V3.

RFC V2 -> RFC V3
1. rename clear_page_private to detach_page_private.

RFC -> RFC V2
1. change the name of new functions to attach/clear_page_private.
2. call attach_page_private(newpage, clear_page_private(page)) to
cleanup code further as suggested by Dave Chinner.

fs/btrfs/disk-io.c | 4 +---
fs/btrfs/extent_io.c | 21 ++++++---------------
fs/btrfs/inode.c | 23 +++++------------------
3 files changed, 12 insertions(+), 36 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 714b57553ed6..44745d5e05cf 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -976,9 +976,7 @@ static void btree_invalidatepage(struct page *page, unsigned int offset,
btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
"page private not zero on page %llu",
(unsigned long long)page_offset(page));
- ClearPagePrivate(page);
- set_page_private(page, 0);
- put_page(page);
+ detach_page_private(page);
}
}

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 451d17bfafd8..704239546093 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3099,22 +3099,16 @@ static int submit_extent_page(unsigned int opf,
static void attach_extent_buffer_page(struct extent_buffer *eb,
struct page *page)
{
- if (!PagePrivate(page)) {
- SetPagePrivate(page);
- get_page(page);
- set_page_private(page, (unsigned long)eb);
- } else {
+ if (!PagePrivate(page))
+ attach_page_private(page, eb);
+ else
WARN_ON(page->private != (unsigned long)eb);
- }
}

void set_page_extent_mapped(struct page *page)
{
- if (!PagePrivate(page)) {
- SetPagePrivate(page);
- get_page(page);
- set_page_private(page, EXTENT_PAGE_PRIVATE);
- }
+ if (!PagePrivate(page))
+ attach_page_private(page, (void *)EXTENT_PAGE_PRIVATE);
}

static struct extent_map *
@@ -4935,10 +4929,7 @@ static void btrfs_release_extent_buffer_pages(struct extent_buffer *eb)
* We need to make sure we haven't be attached
* to a new eb.
*/
- ClearPagePrivate(page);
- set_page_private(page, 0);
- /* One for the page private */
- put_page(page);
+ detach_page_private(page);
}

if (mapped)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 037efc25d993..6c2d6ecedd6a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7927,11 +7927,8 @@ static void btrfs_readahead(struct readahead_control *rac)
static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
{
int ret = try_release_extent_mapping(page, gfp_flags);
- if (ret == 1) {
- ClearPagePrivate(page);
- set_page_private(page, 0);
- put_page(page);
- }
+ if (ret == 1)
+ detach_page_private(page);
return ret;
}

@@ -7953,14 +7950,8 @@ static int btrfs_migratepage(struct address_space *mapping,
if (ret != MIGRATEPAGE_SUCCESS)
return ret;

- if (page_has_private(page)) {
- ClearPagePrivate(page);
- get_page(newpage);
- set_page_private(newpage, page_private(page));
- set_page_private(page, 0);
- put_page(page);
- SetPagePrivate(newpage);
- }
+ if (page_has_private(page))
+ attach_page_private(newpage, detach_page_private(page));

if (PagePrivate2(page)) {
ClearPagePrivate2(page);
@@ -8082,11 +8073,7 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset,
}

ClearPageChecked(page);
- if (PagePrivate(page)) {
- ClearPagePrivate(page);
- set_page_private(page, 0);
- put_page(page);
- }
+ detach_page_private(page);
}

/*
--
2.17.1
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