* them. So when the buffer is up to date and the page size == block size,
* this marks the page up to date instead of adding new buffers.
*/
-static void
-map_buffer_to_page(struct page *page, struct buffer_head *bh, int page_block)
+static void map_buffer_to_folio(struct folio *folio, struct buffer_head *bh,
+ int page_block)
{
- struct inode *inode = page->mapping->host;
+ struct inode *inode = folio->mapping->host;
struct buffer_head *page_bh, *head;
int block = 0;
- if (!page_has_buffers(page)) {
+ head = folio_buffers(folio);
+ if (!head) {
/*
* don't make any buffers if there is only one buffer on
- * the page and the page just needs to be set up to date
+ * the folio and the folio just needs to be set up to date
*/
if (inode->i_blkbits == PAGE_SHIFT &&
buffer_uptodate(bh)) {
- SetPageUptodate(page);
+ folio_mark_uptodate(folio);
return;
}
- create_empty_buffers(page, i_blocksize(inode), 0);
+ create_empty_buffers(&folio->page, i_blocksize(inode), 0);
+ head = folio_buffers(folio);
}
- head = page_buffers(page);
+
page_bh = head;
do {
if (block == page_block) {
struct mpage_readpage_args {
struct bio *bio;
- struct page *page;
+ struct folio *folio;
unsigned int nr_pages;
bool is_readahead;
sector_t last_block_in_bio;
*/
static struct bio *do_mpage_readpage(struct mpage_readpage_args *args)
{
- struct page *page = args->page;
- struct inode *inode = page->mapping->host;
+ struct folio *folio = args->folio;
+ struct inode *inode = folio->mapping->host;
const unsigned blkbits = inode->i_blkbits;
const unsigned blocks_per_page = PAGE_SIZE >> blkbits;
const unsigned blocksize = 1 << blkbits;
blk_opf_t opf = REQ_OP_READ;
unsigned nblocks;
unsigned relative_block;
- gfp_t gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
+ gfp_t gfp = mapping_gfp_constraint(folio->mapping, GFP_KERNEL);
+
+ /* MAX_BUF_PER_PAGE, for example */
+ VM_BUG_ON_FOLIO(folio_test_large(folio), folio);
if (args->is_readahead) {
opf |= REQ_RAHEAD;
gfp |= __GFP_NORETRY | __GFP_NOWARN;
}
- if (page_has_buffers(page))
+ if (folio_buffers(folio))
goto confused;
- block_in_file = (sector_t)page->index << (PAGE_SHIFT - blkbits);
+ block_in_file = (sector_t)folio->index << (PAGE_SHIFT - blkbits);
last_block = block_in_file + args->nr_pages * blocks_per_page;
last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits;
if (last_block > last_block_in_file)
}
/*
- * Then do more get_blocks calls until we are done with this page.
+ * Then do more get_blocks calls until we are done with this folio.
*/
- map_bh->b_page = page;
+ map_bh->b_page = &folio->page;
while (page_block < blocks_per_page) {
map_bh->b_state = 0;
map_bh->b_size = 0;
/* some filesystems will copy data into the page during
* the get_block call, in which case we don't want to
- * read it again. map_buffer_to_page copies the data
- * we just collected from get_block into the page's buffers
- * so readpage doesn't have to repeat the get_block call
+ * read it again. map_buffer_to_folio copies the data
+ * we just collected from get_block into the folio's buffers
+ * so read_folio doesn't have to repeat the get_block call
*/
if (buffer_uptodate(map_bh)) {
- map_buffer_to_page(page, map_bh, page_block);
+ map_buffer_to_folio(folio, map_bh, page_block);
goto confused;
}
}
if (first_hole != blocks_per_page) {
- zero_user_segment(page, first_hole << blkbits, PAGE_SIZE);
+ folio_zero_segment(folio, first_hole << blkbits, PAGE_SIZE);
if (first_hole == 0) {
- SetPageUptodate(page);
- unlock_page(page);
+ folio_mark_uptodate(folio);
+ folio_unlock(folio);
goto out;
}
} else if (fully_mapped) {
- SetPageMappedToDisk(page);
+ folio_set_mappedtodisk(folio);
}
/*
- * This page will go to BIO. Do we need to send this BIO off first?
+ * This folio will go to BIO. Do we need to send this BIO off first?
*/
if (args->bio && (args->last_block_in_bio != blocks[0] - 1))
args->bio = mpage_bio_submit(args->bio);
if (args->bio == NULL) {
if (first_hole == blocks_per_page) {
if (!bdev_read_page(bdev, blocks[0] << (blkbits - 9),
- page))
+ &folio->page))
goto out;
}
args->bio = bio_alloc(bdev, bio_max_segs(args->nr_pages), opf,
}
length = first_hole << blkbits;
- if (bio_add_page(args->bio, page, length, 0) < length) {
+ if (!bio_add_folio(args->bio, folio, length, 0)) {
args->bio = mpage_bio_submit(args->bio);
goto alloc_new;
}
confused:
if (args->bio)
args->bio = mpage_bio_submit(args->bio);
- if (!PageUptodate(page))
- block_read_full_folio(page_folio(page), args->get_block);
+ if (!folio_test_uptodate(folio))
+ block_read_full_folio(folio, args->get_block);
else
- unlock_page(page);
+ folio_unlock(folio);
goto out;
}
*/
void mpage_readahead(struct readahead_control *rac, get_block_t get_block)
{
- struct page *page;
+ struct folio *folio;
struct mpage_readpage_args args = {
.get_block = get_block,
.is_readahead = true,
};
- while ((page = readahead_page(rac))) {
- prefetchw(&page->flags);
- args.page = page;
+ while ((folio = readahead_folio(rac))) {
+ prefetchw(&folio->flags);
+ args.folio = folio;
args.nr_pages = readahead_count(rac);
args.bio = do_mpage_readpage(&args);
- put_page(page);
}
if (args.bio)
mpage_bio_submit(args.bio);
int mpage_read_folio(struct folio *folio, get_block_t get_block)
{
struct mpage_readpage_args args = {
- .page = &folio->page,
+ .folio = folio,
.nr_pages = 1,
.get_block = get_block,
};
- VM_BUG_ON_FOLIO(folio_test_large(folio), folio);
-
args.bio = do_mpage_readpage(&args);
if (args.bio)
mpage_bio_submit(args.bio);
struct bio *bio;
sector_t last_block_in_bio;
get_block_t *get_block;
- unsigned use_writepage;
};
/*
if (bio)
bio = mpage_bio_submit(bio);
- if (mpd->use_writepage) {
- ret = mapping->a_ops->writepage(page, wbc);
- } else {
- ret = -EAGAIN;
- goto out;
- }
/*
* The caller has a ref on the inode, so *mapping is stable
*/
+ ret = block_write_full_page(page, mpd->get_block, wbc);
mapping_set_error(mapping, ret);
out:
mpd->bio = bio;
* @mapping: address space structure to write
* @wbc: subtract the number of written pages from *@wbc->nr_to_write
* @get_block: the filesystem's block mapper function.
- * If this is NULL then use a_ops->writepage. Otherwise, go
- * direct-to-BIO.
*
* This is a library function, which implements the writepages()
* address_space_operation.
mpage_writepages(struct address_space *mapping,
struct writeback_control *wbc, get_block_t get_block)
{
+ struct mpage_data mpd = {
+ .get_block = get_block,
+ };
struct blk_plug plug;
int ret;
blk_start_plug(&plug);
-
- if (!get_block)
- ret = generic_writepages(mapping, wbc);
- else {
- struct mpage_data mpd = {
- .bio = NULL,
- .last_block_in_bio = 0,
- .get_block = get_block,
- .use_writepage = 1,
- };
-
- ret = write_cache_pages(mapping, wbc, __mpage_writepage, &mpd);
- if (mpd.bio)
- mpage_bio_submit(mpd.bio);
- }
- blk_finish_plug(&plug);
- return ret;
-}
-EXPORT_SYMBOL(mpage_writepages);
-
-int mpage_writepage(struct page *page, get_block_t get_block,
- struct writeback_control *wbc)
-{
- struct mpage_data mpd = {
- .bio = NULL,
- .last_block_in_bio = 0,
- .get_block = get_block,
- .use_writepage = 0,
- };
- int ret = __mpage_writepage(page, wbc, &mpd);
+ ret = write_cache_pages(mapping, wbc, __mpage_writepage, &mpd);
if (mpd.bio)
mpage_bio_submit(mpd.bio);
+ blk_finish_plug(&plug);
return ret;
}
-EXPORT_SYMBOL(mpage_writepage);
+EXPORT_SYMBOL(mpage_writepages);
projects / linux-2.6-microblaze.git / blobdiff