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Message-ID: <ZYyrddJK8KJNpKXz@google.com> Date: Wed, 27 Dec 2023 14:55:49 -0800 From: Jaegeuk Kim <jaegeuk@...nel.org> To: Chao Yu <chao@...nel.org> Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/6] f2fs: compress: fix to guarantee persisting compressed blocks by CP On 12/27, Chao Yu wrote: > On 2023/12/27 5:02, Jaegeuk Kim wrote: > > On 12/20, Chao Yu wrote: > > > If data block in compressed cluster is not persisted with metadata > > > during checkpoint, after SPOR, the data may be corrupted, let's > > > guarantee to write compressed page by checkpoint. > > > > > > Fixes: 4c8ff7095bef ("f2fs: support data compression") > > > Signed-off-by: Chao Yu <chao@...nel.org> > > > --- > > > fs/f2fs/compress.c | 3 ++- > > > fs/f2fs/data.c | 12 +++++++++--- > > > fs/f2fs/f2fs.h | 3 ++- > > > 3 files changed, 13 insertions(+), 5 deletions(-) > > > > > > diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c > > > index 5b076329e9bf..1122db8cc0b0 100644 > > > --- a/fs/f2fs/compress.c > > > +++ b/fs/f2fs/compress.c > > > @@ -1442,6 +1442,7 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page) > > > struct f2fs_sb_info *sbi = bio->bi_private; > > > struct compress_io_ctx *cic = > > > (struct compress_io_ctx *)page_private(page); > > > + enum count_type type = WB_DATA_TYPE(page); > > > int i; > > > if (unlikely(bio->bi_status)) > > > @@ -1449,7 +1450,7 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page) > > > f2fs_compress_free_page(page); > > > - dec_page_count(sbi, F2FS_WB_DATA); > > > + dec_page_count(sbi, type); > > > if (atomic_dec_return(&cic->pending_pages)) > > > return; > > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > > > index d28c97282e68..6c72a6e86ba8 100644 > > > --- a/fs/f2fs/data.c > > > +++ b/fs/f2fs/data.c > > > @@ -48,7 +48,7 @@ void f2fs_destroy_bioset(void) > > > bioset_exit(&f2fs_bioset); > > > } > > > -static bool __is_cp_guaranteed(struct page *page) > > > +bool f2fs_is_cp_guaranteed(struct page *page) > > > { > > > struct address_space *mapping = page->mapping; > > > struct inode *inode; > > > @@ -66,7 +66,7 @@ static bool __is_cp_guaranteed(struct page *page) > > > return true; > > > if (f2fs_is_compressed_page(page)) > > > - return false; > > > + return true; > > > if ((S_ISREG(inode->i_mode) && IS_NOQUOTA(inode)) || > > > page_private_gcing(page)) > > > return true; > > > @@ -1007,6 +1007,7 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio) > > > enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); > > > struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp; > > > struct page *bio_page; > > > + enum count_type type; > > > f2fs_bug_on(sbi, is_read_io(fio->op)); > > > @@ -1046,7 +1047,12 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio) > > > /* set submitted = true as a return value */ > > > fio->submitted = 1; > > > - inc_page_count(sbi, WB_DATA_TYPE(bio_page)); > > > + type = WB_DATA_TYPE(bio_page); > > > + /* override count type if page is compressed one */ > > > + if (fio->compressed_page) > > > + type = WB_DATA_TYPE(fio->compressed_page); > > > > Doesn't bio_page already point fio->compressed_page? > > Please check below codes, bio_page will point to fio->encrypted_page if > both software encryption feature and compression feature are on, for this > case, we still need to account F2FS_WB_CP_DATA. So, it seems you want to make F2FS_WB_CP_DATA regardless of conditions. Then, how about making this explictly instead of implicit condition check of the page? #define WB_DATA_TYPE(p, f) (f || __is_cp_guaranteed(p) ? F2FS_WB_CP_DATA : F2FS_WB_DATA) inc_page_count(sbi, WB_DATA_TYPE(bio_page, bio_page == fio->compressed_page)); dec_page_count(sbi, WB_DATA_TYPE(page, f2fs_is_compressed_page(page))); > > if (fio->encrypted_page) > bio_page = fio->encrypted_page; > else if (fio->compressed_page) > bio_page = fio->compressed_page; > else > bio_page = fio->page; > > Thanks, > > > > > > + > > > + inc_page_count(sbi, type); > > > if (io->bio && > > > (!io_is_mergeable(sbi, io->bio, io, fio, io->last_block_in_bio, > > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > > index 76e9a8682e38..bcb3940ab5ba 100644 > > > --- a/fs/f2fs/f2fs.h > > > +++ b/fs/f2fs/f2fs.h > > > @@ -1092,7 +1092,7 @@ struct f2fs_sm_info { > > > * f2fs monitors the number of several block types such as on-writeback, > > > * dirty dentry blocks, dirty node blocks, and dirty meta blocks. > > > */ > > > -#define WB_DATA_TYPE(p) (__is_cp_guaranteed(p) ? F2FS_WB_CP_DATA : F2FS_WB_DATA) > > > +#define WB_DATA_TYPE(p) (f2fs_is_cp_guaranteed(p) ? F2FS_WB_CP_DATA : F2FS_WB_DATA) > > > enum count_type { > > > F2FS_DIRTY_DENTS, > > > F2FS_DIRTY_DATA, > > > @@ -3824,6 +3824,7 @@ void f2fs_init_ckpt_req_control(struct f2fs_sb_info *sbi); > > > */ > > > int __init f2fs_init_bioset(void); > > > void f2fs_destroy_bioset(void); > > > +bool f2fs_is_cp_guaranteed(struct page *page); > > > int f2fs_init_bio_entry_cache(void); > > > void f2fs_destroy_bio_entry_cache(void); > > > void f2fs_submit_read_bio(struct f2fs_sb_info *sbi, struct bio *bio, > > > -- > > > 2.40.1
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