From mboxrd@z Thu Jan 1 00:00:00 1970 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 4DC082AC17 for ; Thu, 6 Feb 2025 02:33:50 +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=1738809231; cv=none; b=aCr/6+dtX+T8ihNIabLgUxihsle+ylmFFxIxHn4u4AYHY/4C52sN2rwgh0xfrrG17UKKcKgKiYmYP58zrA8gPm7eLj2GpyEvDlGvg614cRgOIM9KSnrXLjUxOPAvwir+GKlM3cwW2emv0ZC0JTLSwG2V/FecQGG+mYSNtD6ZSdg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738809231; c=relaxed/simple; bh=I5vIuvKPhmp6PiFbC1WBEkInFmFSnvCcrl/cwPxZ34s=; h=Message-ID:Date:MIME-Version:Cc:Subject:To:References:From: In-Reply-To:Content-Type; b=dDJ8OipwUEa9AB/c2dyjCP/Qlsb9XE9/sdYGQpmkvZ/GKEr3fj0WnvRPbeFqgUuJ62xdm+SrPcopHiuYQ1OurwBVuFa9QNLDPEA6EGU3WkjnJRuk0NzrStidJApiDAdFASyi6VyLEw2nvNOL0aFsbHaItHK7fX6oL7o9wfH2sBU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M5baBKKR; 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="M5baBKKR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD3C1C4CED1; Thu, 6 Feb 2025 02:33:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738809230; bh=I5vIuvKPhmp6PiFbC1WBEkInFmFSnvCcrl/cwPxZ34s=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=M5baBKKRlUMR7WYOZ+yZJpoDR4CA6nvykrI1+RGPQeNKE1sr+NiHfMvYRVZ8kcbRP yCgk9urObttDIyaW5J52tsy0lnBzpan6twuJnjNc+yDScMrAL4WrgwYr4hQuWDTo8q qwv3kaUR/6C6POL/nmi/VDUyVjXNa0bM2MrxNs6pUmP+dMq2PR9EmO4fu67WgavsYG 1h7yhWrj5RAnr3BBMBYgKTjOQGfD+HhRDdajewolf3RrvaZMlA02QK9zSU7uizPhx1 YR8WaWp16bykg827xVQcxMN3IZKy/Bc7OYaMM/Nvmnuz+SvwRlx+mAgBhdYu8+KIEG bGURPk/kdDLYA== Message-ID: <7d99f84f-5f99-4434-a3ef-5054caee22ef@kernel.org> Date: Thu, 6 Feb 2025 10:33:47 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: chao@kernel.org Subject: Re: [f2fs-dev] [PATCH] f2fs: add ioctl to get IO priority hint To: Jaegeuk Kim , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net References: <20250205214014.3270585-1-jaegeuk@kernel.org> Content-Language: en-US From: Chao Yu In-Reply-To: <20250205214014.3270585-1-jaegeuk@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/6/25 05:40, Jaegeuk Kim via Linux-f2fs-devel wrote: > This patch adds an ioctl to give a per-file priority hint to attach > REQ_PRIO. > > Signed-off-by: Jaegeuk Kim > --- > fs/f2fs/data.c | 6 ++++++ > fs/f2fs/f2fs.h | 7 +++++++ > fs/f2fs/file.c | 20 ++++++++++++++++++++ > include/uapi/linux/f2fs.h | 1 + > 4 files changed, 34 insertions(+) > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > index 07b46b444d31..24c5cb1f5ada 100644 > --- a/fs/f2fs/data.c > +++ b/fs/f2fs/data.c > @@ -413,6 +413,7 @@ int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr) > static blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio) > { > unsigned int temp_mask = GENMASK(NR_TEMP_TYPE - 1, 0); > + struct folio *fio_folio = page_folio(fio->page); > unsigned int fua_flag, meta_flag, io_flag; > blk_opf_t op_flags = 0; > > @@ -438,6 +439,11 @@ static blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio) > op_flags |= REQ_META; > if (BIT(fio->temp) & fua_flag) > op_flags |= REQ_FUA; > + > + if (fio->type == DATA && > + F2FS_I(fio_folio->mapping->host)->ioprio_hint == F2FS_IOPRIO_WRITE) > + op_flags |= REQ_PRIO; > + > return op_flags; > } > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index bd0d8138b71d..c0a5f0df8781 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -816,6 +816,12 @@ enum { > FI_MAX, /* max flag, never be used */ > }; > > +/* used for f2fs_inode_info->ioprio_hint. */ > +enum { > + F2FS_IOPRIO_WRITE = 1, /* high write priority */ > + F2FS_IOPRIO_MAX, > +}; This needs to be exported to user via include/uapi/linux/f2fs.h > + > struct f2fs_inode_info { > struct inode vfs_inode; /* serve a vfs inode */ > unsigned long i_flags; /* keep an inode flags for ioctl */ > @@ -830,6 +836,7 @@ struct f2fs_inode_info { > > /* Use below internally in f2fs*/ > unsigned long flags[BITS_TO_LONGS(FI_MAX)]; /* use to pass per-file flags */ > + unsigned int ioprio_hint; /* hint for IO priority */ Seems one bit in f2fs_inode_info->flags is enough to store write priority? > struct f2fs_rwsem i_sem; /* protect fi info */ > atomic_t dirty_pages; /* # of dirty pages */ > f2fs_hash_t chash; /* hash value of given file name */ > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > index 642b8d85a035..2f93a27d2f45 100644 > --- a/fs/f2fs/file.c > +++ b/fs/f2fs/file.c > @@ -3503,6 +3503,23 @@ static int f2fs_ioc_get_dev_alias_file(struct file *filp, unsigned long arg) > (u32 __user *)arg); > } > > +static int f2fs_ioc_io_prio(struct file *filp, unsigned long arg) > +{ > + struct inode *inode = file_inode(filp); > + __u32 level; > + > + if (get_user(level, (__u32 __user *)arg)) > + return -EFAULT; > + > + if (!S_ISREG(inode->i_mode) || level >= F2FS_IOPRIO_MAX) > + return -EINVAL; > + > + inode_lock(inode); > + F2FS_I(inode)->ioprio_hint = level; > + inode_unlock(inode); > + return 0; > +} > + > int f2fs_precache_extents(struct inode *inode) > { > struct f2fs_inode_info *fi = F2FS_I(inode); > @@ -4606,6 +4623,8 @@ static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > return f2fs_ioc_compress_file(filp); > case F2FS_IOC_GET_DEV_ALIAS_FILE: > return f2fs_ioc_get_dev_alias_file(filp, arg); > + case F2FS_IOC_IO_PRIO: > + return f2fs_ioc_io_prio(filp, arg); > default: > return -ENOTTY; > } > @@ -5321,6 +5340,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) > case F2FS_IOC_DECOMPRESS_FILE: > case F2FS_IOC_COMPRESS_FILE: > case F2FS_IOC_GET_DEV_ALIAS_FILE: > + case F2FS_IOC_IO_PRIO: > break; > default: > return -ENOIOCTLCMD; > diff --git a/include/uapi/linux/f2fs.h b/include/uapi/linux/f2fs.h > index cd38a7c166e6..fb2f85b3c540 100644 > --- a/include/uapi/linux/f2fs.h > +++ b/include/uapi/linux/f2fs.h > @@ -46,6 +46,7 @@ > #define F2FS_IOC_GET_DEV_ALIAS_FILE _IOR(F2FS_IOCTL_MAGIC, 26, __u32) > #define F2FS_IOC_DONATE_RANGE _IOW(F2FS_IOCTL_MAGIC, 27, \ > struct f2fs_donate_range) > +#define F2FS_IOC_IO_PRIO _IOW(F2FS_IOCTL_MAGIC, 28, __u32) > > /* > * should be same as XFS_IOC_GOINGDOWN.