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f2fs: compress: fix overwrite may reduce compress ratio unproperly 

when overwrite only first block of cluster, since cluster is not full, it
will call f2fs_write_raw_pages when f2fs_write_multi_pages, and cause the
whole cluster become uncompressed eventhough data can be compressed.
this may will make random write bench score reduce a lot.

root# dd if=/dev/zero of=./fio-test bs=1M count=1

root# sync

root# echo 3 > /proc/sys/vm/drop_caches

root# f2fs_io get_cblocks ./fio-test

root# dd if=/dev/zero of=./fio-test bs=4K count=1 oflag=direct conv=notrunc

w/o patch:
root# f2fs_io get_cblocks ./fio-test
189

w/ patch:
root# f2fs_io get_cblocks ./fio-test
192

Signed-off-by: Fengnan Chang <changfengnan@vivo.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Fengnan Chang 2021-10-22 20:08:00 -07:00 committed by Jaegeuk Kim
parent 71f2c82062
commit b368cc5e26
3 changed files with 39 additions and 18 deletions
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19
fs/f2fs/compress.c
View File

@ -881,6 +881,25 @@ bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
return is_page_in_cluster(cc, index);
}
bool f2fs_all_cluster_page_loaded(struct compress_ctx *cc, struct pagevec *pvec,
int index, int nr_pages)
{
unsigned long pgidx;
int i;
if (nr_pages - index < cc->cluster_size)
return false;
pgidx = pvec->pages[index]->index;
for (i = 1; i < cc->cluster_size; i++) {
if (pvec->pages[index + i]->index != pgidx + i)
return false;
}
return true;
}
static bool cluster_has_invalid_data(struct compress_ctx *cc)
{
loff_t i_size = i_size_read(cc->inode);

36
fs/f2fs/data.c
View File

@ -3040,6 +3040,10 @@ readd:
need_readd = false;
#ifdef CONFIG_F2FS_FS_COMPRESSION
if (f2fs_compressed_file(inode)) {
void *fsdata = NULL;
struct page *pagep;
int ret2;
ret = f2fs_init_compress_ctx(&cc);
if (ret) {
done = 1;
@ -3058,27 +3062,23 @@ readd:
if (unlikely(f2fs_cp_error(sbi)))
goto lock_page;
if (f2fs_cluster_is_empty(&cc)) {
void *fsdata = NULL;
struct page *pagep;
int ret2;
if (!f2fs_cluster_is_empty(&cc))
goto lock_page;
ret2 = f2fs_prepare_compress_overwrite(
ret2 = f2fs_prepare_compress_overwrite(
inode, &pagep,
page->index, &fsdata);
if (ret2 < 0) {
ret = ret2;
done = 1;
break;
} else if (ret2 &&
!f2fs_compress_write_end(inode,
fsdata, page->index,
1)) {
retry = 1;
break;
}
} else {
goto lock_page;
if (ret2 < 0) {
ret = ret2;
done = 1;
break;
} else if (ret2 &&
(!f2fs_compress_write_end(inode,
fsdata, page->index, 1) ||
!f2fs_all_cluster_page_loaded(&cc,
&pvec, i, nr_pages))) {
retry = 1;
break;
}
}
#endif

2
fs/f2fs/f2fs.h
View File

@ -4052,6 +4052,8 @@ void f2fs_end_read_compressed_page(struct page *page, bool failed,
block_t blkaddr);
bool f2fs_cluster_is_empty(struct compress_ctx *cc);
bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index);
bool f2fs_all_cluster_page_loaded(struct compress_ctx *cc, struct pagevec *pvec,
int index, int nr_pages);
bool f2fs_sanity_check_cluster(struct dnode_of_data *dn);
void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page);
int f2fs_write_multi_pages(struct compress_ctx *cc,