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erofs: allow partially filled compressed bvecs

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In order to reduce memory footprints even further, let's allow
partially filled compressed bvecs for readahead to bail out later.

Signed-off-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20231221062341.23901-1-zbestahu@gmail.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Yue Hu 2023-12-21 14:23:41 +08:00 committed by Gao Xiang
parent 0ee3a0d59e
commit 652cdaa886
1 changed files with 13 additions and 23 deletions
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28
fs/erofs/zdata.c
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@ -1202,34 +1202,27 @@ static int z_erofs_parse_in_bvecs(struct z_erofs_decompress_backend *be,
struct z_erofs_bvec *bvec = &pcl->compressed_bvecs[i];
struct page *page = bvec->page;
/* compressed pages ought to be present before decompressing */
/* compressed data ought to be valid before decompressing */
if (!page) {
DBG_BUGON(1);
err = -EIO;
continue;
}
be->compressed_pages[i] = page;
if (z_erofs_is_inline_pcluster(pcl)) {
if (z_erofs_is_inline_pcluster(pcl) ||
erofs_page_is_managed(EROFS_SB(be->sb), page)) {
if (!PageUptodate(page))
err = -EIO;
continue;
}
DBG_BUGON(z_erofs_page_is_invalidated(page));
if (!z_erofs_is_shortlived_page(page)) {
if (erofs_page_is_managed(EROFS_SB(be->sb), page)) {
if (!PageUptodate(page))
err = -EIO;
if (z_erofs_is_shortlived_page(page))
continue;
}
z_erofs_do_decompressed_bvec(be, bvec);
*overlapped = true;
}
}
if (err)
return err;
return 0;
}
static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
@ -1238,7 +1231,7 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
struct erofs_sb_info *const sbi = EROFS_SB(be->sb);
struct z_erofs_pcluster *pcl = be->pcl;
unsigned int pclusterpages = z_erofs_pclusterpages(pcl);
const struct z_erofs_decompressor *decompressor =
const struct z_erofs_decompressor *decomp =
&erofs_decompressors[pcl->algorithmformat];
int i, err2;
struct page *page;
@ -1274,10 +1267,8 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
err2 = z_erofs_parse_in_bvecs(be, &overlapped);
if (err2)
err = err2;
if (err)
goto out;
err = decompressor->decompress(&(struct z_erofs_decompress_req) {
if (!err)
err = decomp->decompress(&(struct z_erofs_decompress_req) {
.sb = be->sb,
.in = be->compressed_pages,
.out = be->decompressed_pages,
@ -1291,7 +1282,6 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
.fillgaps = pcl->multibases,
}, be->pagepool);
out:
/* must handle all compressed pages before actual file pages */
if (z_erofs_is_inline_pcluster(pcl)) {
page = pcl->compressed_bvecs[0].page;
@ -1302,7 +1292,7 @@ out:
/* consider shortlived pages added when decompressing */
page = be->compressed_pages[i];
if (erofs_page_is_managed(sbi, page))
if (!page || erofs_page_is_managed(sbi, page))
continue;
(void)z_erofs_put_shortlivedpage(be->pagepool, page);
WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL);