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erofs: introduce `z_erofs_parse_out_bvecs()'

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`z_erofs_decompress_pcluster()' is too long therefore it'd be better
to introduce another helper to parse decompressed pages (or laterly,
decompressed bvecs.)

BTW, since `decompressed_bvecs' is too long as a part of the function
name, `out_bvecs' is used instead.

Reviewed-by: Yue Hu <huyue2@coolpad.com>
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220715154203.48093-4-hsiangkao@linux.alibaba.com
This commit is contained in:
Gao Xiang 2022-07-15 23:41:50 +08:00
parent 0d823b424f
commit 42fec235f1
1 changed files with 43 additions and 38 deletions
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81
fs/erofs/zdata.c
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@ -778,18 +778,58 @@ static bool z_erofs_page_is_invalidated(struct page *page)
return !page->mapping && !z_erofs_is_shortlived_page(page);
}
static int z_erofs_parse_out_bvecs(struct z_erofs_pcluster *pcl,
struct page **pages, struct page **pagepool)
{
struct z_erofs_pagevec_ctor ctor;
enum z_erofs_page_type page_type;
int i, err = 0;
z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_NR_INLINE_PAGEVECS,
pcl->pagevec, 0);
for (i = 0; i < pcl->vcnt; ++i) {
struct page *page = z_erofs_pagevec_dequeue(&ctor, &page_type);
unsigned int pagenr;
/* all pages in pagevec ought to be valid */
DBG_BUGON(!page);
DBG_BUGON(z_erofs_page_is_invalidated(page));
if (z_erofs_put_shortlivedpage(pagepool, page))
continue;
if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD)
pagenr = 0;
else
pagenr = z_erofs_onlinepage_index(page);
DBG_BUGON(pagenr >= pcl->nr_pages);
/*
* currently EROFS doesn't support multiref(dedup),
* so here erroring out one multiref page.
*/
if (pages[pagenr]) {
DBG_BUGON(1);
SetPageError(pages[pagenr]);
z_erofs_onlinepage_endio(pages[pagenr]);
err = -EFSCORRUPTED;
}
pages[pagenr] = page;
}
z_erofs_pagevec_ctor_exit(&ctor, true);
return err;
}
static int z_erofs_decompress_pcluster(struct super_block *sb,
struct z_erofs_pcluster *pcl,
struct page **pagepool)
{
struct erofs_sb_info *const sbi = EROFS_SB(sb);
unsigned int pclusterpages = z_erofs_pclusterpages(pcl);
struct z_erofs_pagevec_ctor ctor;
unsigned int i, inputsize, outputsize, llen, nr_pages;
struct page *pages_onstack[Z_EROFS_VMAP_ONSTACK_PAGES];
struct page **pages, **compressed_pages, *page;
enum z_erofs_page_type page_type;
bool overlapped, partial;
int err;
@ -823,42 +863,7 @@ static int z_erofs_decompress_pcluster(struct super_block *sb,
for (i = 0; i < nr_pages; ++i)
pages[i] = NULL;
err = 0;
z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_NR_INLINE_PAGEVECS,
pcl->pagevec, 0);
for (i = 0; i < pcl->vcnt; ++i) {
unsigned int pagenr;
page = z_erofs_pagevec_dequeue(&ctor, &page_type);
/* all pages in pagevec ought to be valid */
DBG_BUGON(!page);
DBG_BUGON(z_erofs_page_is_invalidated(page));
if (z_erofs_put_shortlivedpage(pagepool, page))
continue;
if (page_type == Z_EROFS_VLE_PAGE_TYPE_HEAD)
pagenr = 0;
else
pagenr = z_erofs_onlinepage_index(page);
DBG_BUGON(pagenr >= nr_pages);
/*
* currently EROFS doesn't support multiref(dedup),
* so here erroring out one multiref page.
*/
if (pages[pagenr]) {
DBG_BUGON(1);
SetPageError(pages[pagenr]);
z_erofs_onlinepage_endio(pages[pagenr]);
err = -EFSCORRUPTED;
}
pages[pagenr] = page;
}
z_erofs_pagevec_ctor_exit(&ctor, true);
err = z_erofs_parse_out_bvecs(pcl, pages, pagepool);
overlapped = false;
compressed_pages = pcl->compressed_pages;