From nobody Sat Jun 20 23:06:16 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E898B27F01E for ; Thu, 9 Apr 2026 13:45:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775742342; cv=none; b=iTkRPxdAFSrQ2FpH+dDTlHtCs5kbnaS7gjspL/K5kdbxXnDCkE1Jq5Se7n9MHlgA60qJ3fW884/cBjS3jomM+axloDFPhjRSUNq7dijHCtkJR86PfbSXGV6A5uoPkSUoIZh9UCOx0fIrGUtPMZ5/Lb/ax1b6N+ZLK9nqlt+JGuo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775742342; c=relaxed/simple; bh=DCFUYIxfYFbZ4AOYq4SmhJLjLGR+V0S2HKGiUDp8sNA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=uqt/W8jJ/Zr89IviWPm2JHKYKolLrJjtSbPCnr85A20TIebDVIIZCWCMt5ZiBLoUnDVy72gvlKeQQ3i7VjuQfyZnhaFKIjJEK/KXhQrj4C8lTuUyeLMUNPrlIEhtDewnqY+O5u4nUDJRjDOnlKUpen+3DVB2dsdoXKunrSdxLYA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ffrDJRpc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ffrDJRpc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82FA4C4CEF7; Thu, 9 Apr 2026 13:45:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775742341; bh=DCFUYIxfYFbZ4AOYq4SmhJLjLGR+V0S2HKGiUDp8sNA=; h=From:To:Cc:Subject:Date:From; b=ffrDJRpcdcmc1AclWCdvXl0y8s/EPTjj9EB80ubytkPK7Z8VGX/HjBMYSZFjAX0f8 0mSxH9jSCJJMfDNFEbPrfmvK6ww4KIsJ9ZGlM4LJ2O4HPkkgz+tGop93bhs/doTdx4 Kc6eM1vNwrFHIl0eyvp129LnpEpFPVWuP09KVXmoZ3cRHHOXH3Tg213NqCZ6+hYXiv JzGQbLDRXBQSH+oS++WagZELwFNgZJpYuBbEJ5kEG6BM3X9gmOIvHR0HHkIsTkEF8A kpg+lYFgBPLgJU80pt0WIkBkmMmJG0y3MpnXypQJ91wUMCVcrJ5sL1Bv4awy8ekewQ Uvi28G7KOJ90A== From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim , Akilesh Kailash Subject: [PATCH] f2fs: another way to set large folio by remembering inode number Date: Thu, 9 Apr 2026 13:45:38 +0000 Message-ID: <20260409134538.3692605-1-jaegeuk@kernel.org> X-Mailer: git-send-email 2.53.0.1213.gd9a14994de-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" enum { F2FS_XATTR_FADV_LARGEFOLIO, }; unsigned int value =3D BIT(F2FS_XATTR_FADV_LARGEFOLIO); 1. setxattr(file, "user.fadvise", &value, sizeof(unsigned int), 0) -> register the inode number for large folio 2. chmod(0400, file) -> make Read-Only 3. open() -> f2fs_iget() with large folio 4. open(WRITE), mkwrite on mmap, chmod(WRITE) -> return error 5. iput() and open() -> goto #3 6. unlink -> deregister the inode number Suggested-by: Akilesh Kailash Signed-off-by: Jaegeuk Kim Reviewed-by: Chao Yu --- fs/f2fs/checkpoint.c | 2 +- fs/f2fs/data.c | 2 +- fs/f2fs/f2fs.h | 1 + fs/f2fs/file.c | 11 +++++++++-- fs/f2fs/inode.c | 19 ++++++++++++++++--- fs/f2fs/super.c | 7 +++++++ fs/f2fs/xattr.c | 35 ++++++++++++++++++++++++++++++++++- fs/f2fs/xattr.h | 6 ++++++ 8 files changed, 75 insertions(+), 8 deletions(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 01e1ba77263e..fdd62ddc3ed6 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -778,7 +778,7 @@ void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, ni= d_t ino, int type) __remove_ino_entry(sbi, ino, type); } =20 -/* mode should be APPEND_INO, UPDATE_INO or TRANS_DIR_INO */ +/* mode should be APPEND_INO, UPDATE_INO, LARGE_FOLIO_IO, or TRANS_DIR_INO= */ bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode) { struct inode_management *im =3D &sbi->im[mode]; diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 965d4e6443c6..5e46230398d7 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2494,7 +2494,7 @@ static int f2fs_read_data_large_folio(struct inode *i= node, int ret =3D 0; bool folio_in_bio; =20 - if (!IS_IMMUTABLE(inode) || f2fs_compressed_file(inode)) { + if (f2fs_compressed_file(inode)) { if (folio) folio_unlock(folio); return -EOPNOTSUPP; diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index e40b6b2784ee..02bc6eb96a59 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -381,6 +381,7 @@ enum { /* for the list of ino */ enum { ORPHAN_INO, /* for orphan ino list */ + LARGE_FOLIO_INO, /* for large folio case */ APPEND_INO, /* for append ino list */ UPDATE_INO, /* for update ino list */ TRANS_DIR_INO, /* for transactions dir ino list */ diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index c0220cd7b332..64ba900410fc 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -2068,9 +2068,16 @@ static long f2fs_fallocate(struct file *file, int mo= de, =20 static int f2fs_release_file(struct inode *inode, struct file *filp) { - if (atomic_dec_and_test(&F2FS_I(inode)->open_count)) + if (atomic_dec_and_test(&F2FS_I(inode)->open_count)) { f2fs_remove_donate_inode(inode); - + /* + * In order to get large folio as soon as possible, let's drop + * inode cache asap. See also f2fs_drop_inode. + */ + if (f2fs_exist_written_data(F2FS_I_SB(inode), + inode->i_ino, LARGE_FOLIO_INO)) + d_drop(filp->f_path.dentry); + } /* * f2fs_release_file is called at every close calls. So we should * not drop any inmemory pages by close called by other process. diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 89240be8cc59..e100bc5a378c 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -565,6 +565,20 @@ static bool is_meta_ino(struct f2fs_sb_info *sbi, unsi= gned int ino) ino =3D=3D F2FS_COMPRESS_INO(sbi); } =20 +static void f2fs_mapping_set_large_folio(struct inode *inode) +{ + struct f2fs_sb_info *sbi =3D F2FS_I_SB(inode); + + if (f2fs_compressed_file(inode)) + return; + if (f2fs_quota_file(sbi, inode->i_ino)) + return; + if (IS_IMMUTABLE(inode) || + (f2fs_exist_written_data(sbi, inode->i_ino, LARGE_FOLIO_INO) && + !(inode->i_mode & S_IWUGO))) + mapping_set_folio_min_order(inode->i_mapping, 0); +} + struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) { struct f2fs_sb_info *sbi =3D F2FS_SB(sb); @@ -620,9 +634,7 @@ struct inode *f2fs_iget(struct super_block *sb, unsigne= d long ino) inode->i_op =3D &f2fs_file_inode_operations; inode->i_fop =3D &f2fs_file_operations; inode->i_mapping->a_ops =3D &f2fs_dblock_aops; - if (IS_IMMUTABLE(inode) && !f2fs_compressed_file(inode) && - !f2fs_quota_file(sbi, inode->i_ino)) - mapping_set_folio_min_order(inode->i_mapping, 0); + f2fs_mapping_set_large_folio(inode); } else if (S_ISDIR(inode->i_mode)) { inode->i_op =3D &f2fs_dir_inode_operations; inode->i_fop =3D &f2fs_dir_operations; @@ -895,6 +907,7 @@ void f2fs_evict_inode(struct inode *inode) f2fs_remove_ino_entry(sbi, inode->i_ino, APPEND_INO); f2fs_remove_ino_entry(sbi, inode->i_ino, UPDATE_INO); f2fs_remove_ino_entry(sbi, inode->i_ino, FLUSH_INO); + f2fs_remove_ino_entry(sbi, inode->i_ino, LARGE_FOLIO_INO); =20 if (!is_sbi_flag_set(sbi, SBI_IS_FREEZING)) { sb_start_intwrite(inode->i_sb); diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index ccf806b676f5..f12fb1ccc877 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1844,6 +1844,13 @@ static int f2fs_drop_inode(struct inode *inode) return 1; } } + /* + * In order to get large folio as soon as possible, let's drop + * inode cache asap. See also f2fs_release_file. + */ + if (f2fs_exist_written_data(F2FS_I_SB(inode), + inode->i_ino, LARGE_FOLIO_INO)) + return 1; =20 /* * This is to avoid a deadlock condition like below. diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c index 941dc62a6d6f..0c0e44c2dcdd 100644 --- a/fs/f2fs/xattr.c +++ b/fs/f2fs/xattr.c @@ -44,6 +44,16 @@ static void xattr_free(struct f2fs_sb_info *sbi, void *x= attr_addr, kfree(xattr_addr); } =20 +static int f2fs_xattr_fadvise_get(struct inode *inode, void *buffer) +{ + if (!buffer) + goto out; + if (mapping_large_folio_support(inode->i_mapping)) + *((unsigned int *)buffer) |=3D BIT(F2FS_XATTR_FADV_LARGEFOLIO); +out: + return sizeof(unsigned int); +} + static int f2fs_xattr_generic_get(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, void *buffer, size_t size) @@ -61,10 +71,29 @@ static int f2fs_xattr_generic_get(const struct xattr_ha= ndler *handler, default: return -EINVAL; } + if (handler->flags =3D=3D F2FS_XATTR_INDEX_USER && + !strcmp(name, "fadvise")) + return f2fs_xattr_fadvise_get(inode, buffer); + return f2fs_getxattr(inode, handler->flags, name, buffer, size, NULL); } =20 +static int f2fs_xattr_fadvise_set(struct inode *inode, const void *value) +{ + unsigned int new_fadvise; + + new_fadvise =3D *(unsigned int *)value; + + if (new_fadvise & BIT(F2FS_XATTR_FADV_LARGEFOLIO)) + f2fs_add_ino_entry(F2FS_I_SB(inode), + inode->i_ino, LARGE_FOLIO_INO); + else + f2fs_remove_ino_entry(F2FS_I_SB(inode), + inode->i_ino, LARGE_FOLIO_INO); + return 0; +} + static int f2fs_xattr_generic_set(const struct xattr_handler *handler, struct mnt_idmap *idmap, struct dentry *unused, struct inode *inode, @@ -84,6 +113,10 @@ static int f2fs_xattr_generic_set(const struct xattr_ha= ndler *handler, default: return -EINVAL; } + if (handler->flags =3D=3D F2FS_XATTR_INDEX_USER && + !strcmp(name, "fadvise")) + return f2fs_xattr_fadvise_set(inode, value); + return f2fs_setxattr(inode, handler->flags, name, value, size, NULL, flags); } @@ -842,4 +875,4 @@ int __init f2fs_init_xattr_cache(void) void f2fs_destroy_xattr_cache(void) { kmem_cache_destroy(inline_xattr_slab); -} \ No newline at end of file +} diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h index bce3d93e4755..455f460d014e 100644 --- a/fs/f2fs/xattr.h +++ b/fs/f2fs/xattr.h @@ -24,6 +24,7 @@ #define F2FS_XATTR_REFCOUNT_MAX 1024 =20 /* Name indexes */ +#define F2FS_USER_FADVISE_NAME "user.fadvise" #define F2FS_SYSTEM_ADVISE_NAME "system.advise" #define F2FS_XATTR_INDEX_USER 1 #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 @@ -39,6 +40,11 @@ #define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c" #define F2FS_XATTR_NAME_VERITY "v" =20 +/* used for F2FS_USER_FADVISE_NAME */ +enum { + F2FS_XATTR_FADV_LARGEFOLIO, +}; + struct f2fs_xattr_header { __le32 h_magic; /* magic number for identification */ __le32 h_refcount; /* reference count */ --=20 2.53.0.1213.gd9a14994de-goog