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Date: Wed, 13 Oct 2021 12:00:33 -0400
From: Kent Overstreet <kent.overstreet@...il.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
akpm@...ux-foundation.org, linux-raid@...r.kernel.org,
linux-block@...r.kernel.org, axboe@...nel.dk
Cc: Kent Overstreet <kent.overstreet@...il.com>,
alexander.h.duyck@...ux.intel.com
Subject: [PATCH 4/5] md: Kill usage of page->index
As part of the struct page cleanups underway, we want to remove as much
usage of page->mapping and page->index as possible, as frequently they
are known from context - as they are here in the md bitmap code.
Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
---
drivers/md/md-bitmap.c | 44 ++++++++++++++++++++----------------------
1 file changed, 21 insertions(+), 23 deletions(-)
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index e29c6298ef..dcdb4597c5 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -165,10 +165,8 @@ static int read_sb_page(struct mddev *mddev, loff_t offset,
if (sync_page_io(rdev, target,
roundup(size, bdev_logical_block_size(rdev->bdev)),
- page, REQ_OP_READ, 0, true)) {
- page->index = index;
+ page, REQ_OP_READ, 0, true))
return 0;
- }
}
return -EIO;
}
@@ -209,7 +207,8 @@ static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mdde
return NULL;
}
-static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
+static int write_sb_page(struct bitmap *bitmap, struct page *page,
+ unsigned long index, int wait)
{
struct md_rdev *rdev;
struct block_device *bdev;
@@ -224,7 +223,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev;
- if (page->index == store->file_pages-1) {
+ if (index == store->file_pages-1) {
int last_page_size = store->bytes & (PAGE_SIZE-1);
if (last_page_size == 0)
last_page_size = PAGE_SIZE;
@@ -236,8 +235,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
*/
if (mddev->external) {
/* Bitmap could be anywhere. */
- if (rdev->sb_start + offset + (page->index
- * (PAGE_SIZE/512))
+ if (rdev->sb_start + offset + index * PAGE_SECTORS
> rdev->data_offset
&&
rdev->sb_start + offset
@@ -247,7 +245,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
} else if (offset < 0) {
/* DATA BITMAP METADATA */
if (offset
- + (long)(page->index * (PAGE_SIZE/512))
+ + (long)(index * PAGE_SECTORS)
+ size/512 > 0)
/* bitmap runs in to metadata */
goto bad_alignment;
@@ -259,7 +257,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
/* METADATA BITMAP DATA */
if (rdev->sb_start
+ offset
- + page->index*(PAGE_SIZE/512) + size/512
+ + index * PAGE_SECTORS + size/512
> rdev->data_offset)
/* bitmap runs in to data */
goto bad_alignment;
@@ -268,7 +266,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
}
md_super_write(mddev, rdev,
rdev->sb_start + offset
- + page->index * (PAGE_SIZE/512),
+ + index * PAGE_SECTORS,
size,
page);
}
@@ -285,12 +283,13 @@ static void md_bitmap_file_kick(struct bitmap *bitmap);
/*
* write out a page to a file
*/
-static void write_page(struct bitmap *bitmap, struct page *page, int wait)
+static void write_page(struct bitmap *bitmap, struct page *page,
+ unsigned long index, int wait)
{
struct buffer_head *bh;
if (bitmap->storage.file == NULL) {
- switch (write_sb_page(bitmap, page, wait)) {
+ switch (write_sb_page(bitmap, page, index, wait)) {
case -EINVAL:
set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
}
@@ -399,7 +398,6 @@ static int read_page(struct file *file, unsigned long index,
blk_cur++;
bh = bh->b_this_page;
}
- page->index = index;
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
@@ -472,7 +470,7 @@ void md_bitmap_update_sb(struct bitmap *bitmap)
sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
bitmap_info.space);
kunmap_atomic(sb);
- write_page(bitmap, bitmap->storage.sb_page, 1);
+ write_page(bitmap, bitmap->storage.sb_page, 0, 1);
}
EXPORT_SYMBOL(md_bitmap_update_sb);
@@ -524,7 +522,6 @@ static int md_bitmap_new_disk_sb(struct bitmap *bitmap)
bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (bitmap->storage.sb_page == NULL)
return -ENOMEM;
- bitmap->storage.sb_page->index = 0;
sb = kmap_atomic(bitmap->storage.sb_page);
@@ -802,7 +799,6 @@ static int md_bitmap_storage_alloc(struct bitmap_storage *store,
if (store->sb_page) {
store->filemap[0] = store->sb_page;
pnum = 1;
- store->sb_page->index = offset;
}
for ( ; pnum < num_pages; pnum++) {
@@ -929,6 +925,7 @@ static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
unsigned long chunk = block >> bitmap->counts.chunkshift;
struct bitmap_storage *store = &bitmap->storage;
unsigned long node_offset = 0;
+ unsigned long index = file_page_index(store, chunk);
if (mddev_is_clustered(bitmap->mddev))
node_offset = bitmap->cluster_slot * store->file_pages;
@@ -945,9 +942,9 @@ static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
else
set_bit_le(bit, kaddr);
kunmap_atomic(kaddr);
- pr_debug("set file bit %lu page %lu\n", bit, page->index);
+ pr_debug("set file bit %lu page %lu\n", bit, index);
/* record page number so it gets flushed to disk when unplug occurs */
- set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_DIRTY);
+ set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_DIRTY);
}
static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
@@ -958,6 +955,7 @@ static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
unsigned long chunk = block >> bitmap->counts.chunkshift;
struct bitmap_storage *store = &bitmap->storage;
unsigned long node_offset = 0;
+ unsigned long index = file_page_index(store, chunk);
if (mddev_is_clustered(bitmap->mddev))
node_offset = bitmap->cluster_slot * store->file_pages;
@@ -972,8 +970,8 @@ static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
else
clear_bit_le(bit, paddr);
kunmap_atomic(paddr);
- if (!test_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_NEEDWRITE)) {
- set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_PENDING);
+ if (!test_page_attr(bitmap, index - node_offset, BITMAP_PAGE_NEEDWRITE)) {
+ set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_PENDING);
bitmap->allclean = 0;
}
}
@@ -1027,7 +1025,7 @@ void md_bitmap_unplug(struct bitmap *bitmap)
"md bitmap_unplug");
}
clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING);
- write_page(bitmap, bitmap->storage.filemap[i], 0);
+ write_page(bitmap, bitmap->storage.filemap[i], i, 0);
writing = 1;
}
}
@@ -1137,7 +1135,7 @@ static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
memset(paddr + offset, 0xff,
PAGE_SIZE - offset);
kunmap_atomic(paddr);
- write_page(bitmap, page, 1);
+ write_page(bitmap, page, index, 1);
ret = -EIO;
if (test_bit(BITMAP_WRITE_ERROR,
@@ -1336,7 +1334,7 @@ void md_bitmap_daemon_work(struct mddev *mddev)
if (bitmap->storage.filemap &&
test_and_clear_page_attr(bitmap, j,
BITMAP_PAGE_NEEDWRITE)) {
- write_page(bitmap, bitmap->storage.filemap[j], 0);
+ write_page(bitmap, bitmap->storage.filemap[j], j, 0);
}
}
--
2.33.0
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