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Thu, 27 Aug 2026 06:57:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76ED91F000E9; Thu, 27 Aug 2026 06:57:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787813876; bh=6RUNKVZP1/EjGzftBQcXeoA1qtMHIenz5b7FvyuTo1I=; h=Date:Cc:Subject:To:References:From:In-Reply-To; b=VCDyxhTgEz3ib8XrhYPmsl8BZQblg6TBt97bEaO/+3JWvIvdQBGoHUFckxMIxC7G7 Lddjm/8gsBWc4A5i1PNNLpzzYOyae84L0meKKyRJiRgyaE6N2VunC0QUoQHIzbKsUP qYZZJRgiiE8euZwf2mwQmOaoAxr1cFLgXThej9/mHup6PDS0QNzTdpkfiUAu1il/B4 MV3gE0/3byy8Sksn2GgHUMCD8UvYRAL4pDgHItjOPcL3H5cS2RmmcrhjxeMgs3wtKy dnuP1aCJenON3qGB/HgvCceIzciNurUMNH/rFtWAtnwodAMagyYdFifg1P5kBnA7c2 zlLwi3v6wOvDA== Message-ID: <22b18f2e-70f5-4292-b83e-8f6c374a627d@kernel.org> Date: Thu, 27 Aug 2026 14:57:52 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Nanzhe Zhao , linux-f2fs-devel@lists.sourceforge.net, Jaegeuk Kim References: <20260826082641.2007658-1-zhaonanzhe@xiaomi.com> <20260826082641.2007658-2-zhaonanzhe@xiaomi.com> Content-Language: en-US In-Reply-To: <20260826082641.2007658-2-zhaonanzhe@xiaomi.com> X-Headers-End: 1wzU3m-00049H-Ip Subject: Re: [f2fs-dev] [PATCH 01/14] f2fs: extend folio state for large folio write path X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Chao Yu via Linux-f2fs-devel Reply-To: Chao Yu Cc: Barry Song , Juan Yescas , Dev Jain , linux-kernel@vger.kernel.org, David Hildenbrand , Bo Zhang , Kalesh Singh , Nanzhe Zhao , Pengfei Li , Ryan Roberts Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 8/26/26 16:26, Nanzhe Zhao wrote: > Large folio write path needs a subpage status bitmap and write > pages pending counter, while keeping compatible with f2fs private > flags. > > Move struct f2fs_folio_state to f2fs.h, add private_flags and > subpage state bitmap, and change PAGE_PRIVATE functions to be > compatible with f2fs_folio_state. Allocate f2fs_folio_state via kzalloc > instead of kmem_cache, since the state size depends on the folio order. > > Note: Now if a path wants to use f2fs_folio_state, it must call > `folio_has_ffs` instead of `folio_test_large`` to make check. > > Signed-off-by: Nanzhe Zhao > --- > fs/f2fs/compress.c | 2 + > fs/f2fs/data.c | 60 ++++++++++++++++-------------- > fs/f2fs/f2fs.h | 92 ++++++++++++++++++++++++++++++++++++---------- > fs/f2fs/segment.c | 2 +- > 4 files changed, 108 insertions(+), 48 deletions(-) > > diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c > index 91855d91bbdd..84da3e39efb4 100644 > --- a/fs/f2fs/compress.c > +++ b/fs/f2fs/compress.c > @@ -78,6 +78,8 @@ bool f2fs_is_compressed_page(struct folio *folio) > return false; > if (folio_test_f2fs_nonpointer(folio)) > return false; > + if (f2fs_folio_has_ffs(folio)) > + return false; Shouldn't this be changed in "f2fs: make compressed files compatible with large folio" or other patch? I guess in this patch we only introduce new ffs facilities. > > f2fs_bug_on(F2FS_F_SB(folio), > *((u32 *)folio->private) != F2FS_COMPRESSED_PAGE_MAGIC); > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > index 6ae0eb37d20f..578a90d427e2 100644 > --- a/fs/f2fs/data.c > +++ b/fs/f2fs/data.c > @@ -32,20 +32,13 @@ > > static struct kmem_cache *bio_post_read_ctx_cache; > static struct kmem_cache *bio_entry_slab; > -static struct kmem_cache *ffs_entry_slab; > static mempool_t *bio_post_read_ctx_pool; > static struct bio_set f2fs_bioset; > > -struct f2fs_folio_state { > - spinlock_t state_lock; > - unsigned int read_pages_pending; > -}; > - > struct f2fs_bio { > struct work_struct work; > struct bio bio; > }; > - Unnecessary change. > #define F2FS_BIO_POOL_SIZE NR_CURSEG_TYPE > > int __init f2fs_init_bioset(void) > @@ -133,6 +126,9 @@ struct bio_post_read_ctx { > block_t fs_blkaddr; > }; > > +static bool __ffs_mark_subrange_uptodate(struct folio *folio, > + struct f2fs_folio_state *ffs, size_t offset, size_t len); > + > /* > * Update and unlock a bio's pages, and free the bio. > * > @@ -155,7 +151,7 @@ static void f2fs_finish_read_bio(struct bio *bio, bool in_task) > > bio_for_each_folio_all(fi, bio) { > struct folio *folio = fi.folio; > - unsigned nr_pages = fi.length >> PAGE_SHIFT; > + unsigned int nr_pages = fi.length >> PAGE_SHIFT; No need to change in this patch? > bool finished = true; > > if (!folio_test_large(folio) && > @@ -360,6 +356,7 @@ static void f2fs_write_end_bio(struct bio *bio) > > bio_for_each_folio_all(fi, bio) { > struct folio *folio = fi.folio; > + unsigned int nr_pages = fi.length >> PAGE_SHIFT; No need to change in this patch? > enum count_type type; > > if (fscrypt_is_bounce_folio(folio)) { > @@ -2516,17 +2513,32 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret, > } > #endif > > -static struct f2fs_folio_state *ffs_find_or_alloc(struct folio *folio) > +struct f2fs_folio_state *f2fs_ffs_find_or_alloc(struct folio *folio) > { > - struct f2fs_folio_state *ffs = folio->private; > + struct f2fs_folio_state *ffs; > + unsigned int nr_subpages = folio_nr_pages(folio); > + unsigned long private_flags = 0; > + > + f2fs_bug_on(F2FS_F_SB(folio), !folio_test_large(folio)); > > - if (ffs) > - return ffs; > + if (f2fs_folio_has_ffs(folio)) > + return (struct f2fs_folio_state *)folio->private; > > - ffs = f2fs_kmem_cache_alloc(ffs_entry_slab, > - GFP_NOIO | __GFP_ZERO, true, NULL); > + if (folio_test_private(folio) && folio_test_f2fs_nonpointer(folio)) > + private_flags = (unsigned long)folio->private; > + > + ffs = kzalloc(struct_size(ffs, state, BITS_TO_LONGS(2 * nr_subpages)), > + GFP_NOIO | __GFP_NOFAIL); > > spin_lock_init(&ffs->state_lock); > + ffs->private_flags = private_flags; > + if (folio_test_uptodate(folio)) > + bitmap_set(ffs->state, 0, nr_subpages); > + if (folio_test_dirty(folio)) > + bitmap_set(ffs->state, nr_subpages, nr_subpages); > + > + if (folio_test_private(folio)) > + folio_detach_private(folio); > folio_attach_private(folio, ffs); > return ffs; > } > @@ -2535,7 +2547,7 @@ static void ffs_detach_free(struct folio *folio) > { > struct f2fs_folio_state *ffs; > > - if (!folio_test_large(folio)) { > + if (!f2fs_folio_has_ffs(folio)) { > folio_detach_private(folio); > return; > } > @@ -2545,7 +2557,8 @@ static void ffs_detach_free(struct folio *folio) > return; > > WARN_ON_ONCE(ffs->read_pages_pending != 0); > - kmem_cache_free(ffs_entry_slab, ffs); > + WARN_ON_ONCE(atomic_read(&ffs->write_pages_pending)); > + kfree(ffs); > } > > static int f2fs_read_data_large_folio(struct inode *inode, > @@ -2558,7 +2571,7 @@ static int f2fs_read_data_large_folio(struct inode *inode, > pgoff_t index, offset, next_pgofs = 0; > unsigned max_nr_pages = rac ? readahead_count(rac) : > folio_nr_pages(folio); > - unsigned nrpages; > + unsigned int nrpages, len_blks; > struct f2fs_folio_state *ffs; > int ret = 0; > bool folio_in_bio = false; > @@ -2634,7 +2647,7 @@ static int f2fs_read_data_large_folio(struct inode *inode, > * to prevent from premature folio_end_read() call on folio > */ > if (folio_test_large(folio)) { > - ffs = ffs_find_or_alloc(folio); > + ffs = f2fs_ffs_find_or_alloc(folio); > > /* set the bitmap to wait */ > spin_lock_irq(&ffs->state_lock); > @@ -2987,7 +3000,7 @@ bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio) > return true; > > if (fio) { > - if (page_private_gcing(fio->page)) > + if (folio_test_f2fs_gcing(fio->folio)) Shouldn't this be changed in "f2fs: make GC migration large-folio aware"? > return true; > if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) && > f2fs_is_checkpointed_data(sbi, fio->old_blkaddr))) > @@ -4586,21 +4599,12 @@ int __init f2fs_init_bio_entry_cache(void) > if (!bio_entry_slab) > return -ENOMEM; > > - ffs_entry_slab = f2fs_kmem_cache_create("f2fs_ffs_slab", > - sizeof(struct f2fs_folio_state)); > - > - if (!ffs_entry_slab) { > - kmem_cache_destroy(bio_entry_slab); > - return -ENOMEM; > - } > - > return 0; > } > > void f2fs_destroy_bio_entry_cache(void) > { > kmem_cache_destroy(bio_entry_slab); > - kmem_cache_destroy(ffs_entry_slab); > } > > static int f2fs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index 16720f1f0a9c..2e8f85cea6d0 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -1628,6 +1628,18 @@ static inline void f2fs_clear_bit(unsigned int nr, char *addr); > * Layout B: lowest bit should be 0 > * page.private is a wrapped pointer. > */ > + > +struct f2fs_folio_state { > + spinlock_t state_lock; > + unsigned int read_pages_pending; > + atomic_t write_pages_pending; > + unsigned long private_flags; > + /* state[0..nr_subpages - 1] tracks uptodate subpages. > + * state[nr_subpages..2 * nr_subpages - 1] tracks dirty subpages. > + */ > + unsigned long state[]; > +}; > + > enum { > PAGE_PRIVATE_NOT_POINTER, /* private contains non-pointer data */ > PAGE_PRIVATE_ONGOING_MIGRATION, /* data page which is on-going migrating */ > @@ -1637,6 +1649,14 @@ enum { > PAGE_PRIVATE_MAX > }; > > +static inline bool f2fs_folio_has_ffs(const struct folio *folio) > +{ > + unsigned long private = (unsigned long)folio->private; > + > + return folio_test_large(folio) && private && > + !(private & BIT(PAGE_PRIVATE_NOT_POINTER)); Is this a bug? in which case we will set PAGE_PRIVATE_NOT_POINTER in a large folio? maybe I missed some cases... folio_test_large(folio) && private is true and (private & BIT(PAGE_PRIVATE_NOT_POINTER) is true? > +} > + > /* For compression */ > enum compress_algorithm_type { > COMPRESS_LZO, > @@ -2682,10 +2702,57 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi, > return -ENOSPC; > } > > +static inline unsigned long f2fs_folio_get_private_flags(const struct folio *folio) > +{ > + if (f2fs_folio_has_ffs(folio)) { > + struct f2fs_folio_state *ffs = folio->private; > + > + return ffs->private_flags; > + } > + > + return (unsigned long)folio->private; > +} > + > +static inline void f2fs_folio_set_private_flags(struct folio *folio, > + unsigned long flags) > +{ > + if (f2fs_folio_has_ffs(folio)) { > + struct f2fs_folio_state *ffs = folio->private; > + > + ffs->private_flags |= flags; > + return; > + } > + > + if (!folio_test_private(folio)) > + folio_attach_private(folio, (void *)flags); > + else > + folio->private = (void *)((unsigned long)folio->private | flags); > +} > + > +static inline void f2fs_folio_clear_private_flags(struct folio *folio, > + unsigned long flags) > +{ > + unsigned long private; > + > + if (f2fs_folio_has_ffs(folio)) { > + struct f2fs_folio_state *ffs = folio->private; > + > + ffs->private_flags &= ~flags; > + return; > + } > + > + private = (unsigned long)folio->private; > + private &= ~flags; > + if (private == BIT(PAGE_PRIVATE_NOT_POINTER)) > + folio_detach_private(folio); > + else > + folio->private = (void *)private; > +} > + > #define PAGE_PRIVATE_GET_FUNC(name, flagname) \ > static inline bool folio_test_f2fs_##name(const struct folio *folio) \ > { \ > - unsigned long priv = (unsigned long)folio->private; \ > + unsigned long priv = f2fs_folio_get_private_flags(folio); \ > unsigned long v = (1UL << PAGE_PRIVATE_NOT_POINTER) | \ > (1UL << PAGE_PRIVATE_##flagname); \ > return (priv & v) == v; \ > @@ -2702,12 +2769,7 @@ static inline void folio_set_f2fs_##name(struct folio *folio) \ > { \ > unsigned long v = (1UL << PAGE_PRIVATE_NOT_POINTER) | \ > (1UL << PAGE_PRIVATE_##flagname); \ > - if (!folio->private) \ > - folio_attach_private(folio, (void *)v); \ > - else { \ > - v |= (unsigned long)folio->private; \ > - folio->private = (void *)v; \ > - } \ > + f2fs_folio_set_private_flags(folio, v); \ > } \ > static inline void set_page_private_##name(struct page *page) \ > { \ > @@ -2720,13 +2782,8 @@ static inline void set_page_private_##name(struct page *page) \ > #define PAGE_PRIVATE_CLEAR_FUNC(name, flagname) \ > static inline void folio_clear_f2fs_##name(struct folio *folio) \ > { \ > - unsigned long v = (unsigned long)folio->private; \ > - \ > - v &= ~(1UL << PAGE_PRIVATE_##flagname); \ > - if (v == (1UL << PAGE_PRIVATE_NOT_POINTER)) \ > - folio_detach_private(folio); \ > - else \ > - folio->private = (void *)v; \ > + f2fs_folio_clear_private_flags(folio, \ > + 1UL << PAGE_PRIVATE_##flagname); \ > } \ > static inline void clear_page_private_##name(struct page *page) \ > { \ > @@ -2752,7 +2809,7 @@ PAGE_PRIVATE_CLEAR_FUNC(atomic, ATOMIC_WRITE); > > static inline unsigned long folio_get_f2fs_data(struct folio *folio) > { > - unsigned long data = (unsigned long)folio->private; > + unsigned long data = f2fs_folio_get_private_flags(folio); > > if (!test_bit(PAGE_PRIVATE_NOT_POINTER, &data)) > return 0; > @@ -2763,10 +2820,7 @@ static inline void folio_set_f2fs_data(struct folio *folio, unsigned long data) > { > data = (1UL << PAGE_PRIVATE_NOT_POINTER) | (data << PAGE_PRIVATE_MAX); > > - if (!folio_test_private(folio)) > - folio_attach_private(folio, (void *)data); > - else > - folio->private = (void *)((unsigned long)folio->private | data); > + f2fs_folio_set_private_flags(folio, data); > } > > static inline void dec_valid_block_count(struct f2fs_sb_info *sbi, > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > index ed6f2947210b..df10119d94ad 100644 > --- a/fs/f2fs/segment.c > +++ b/fs/f2fs/segment.c > @@ -3803,7 +3803,7 @@ static int __get_segment_type_6(struct f2fs_io_info *fio) > if (is_inode_flag_set(inode, FI_ALIGNED_WRITE)) > return CURSEG_COLD_DATA_PINNED; > > - if (page_private_gcing(fio->page)) { > + if (folio_test_f2fs_gcing(fio->folio)) { Shouldn't this be changed in "f2fs: make GC migration large-folio aware"? Thanks, > if (fio->sbi->am.atgc_enabled && > (fio->io_type == FS_DATA_IO) && > (fio->sbi->gc_mode != GC_URGENT_HIGH) && _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel