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 006B42701B3 for ; Wed, 23 Apr 2025 08:49:59 +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=1745398200; cv=none; b=URbWJm4HH5MtQ0jl76C8Fjb8Gy/LB82eQAVMDv2DvecFj/QhKvNy17NHtAUMd5HtGgD8r5DK1zwg4Lj6+eHxOHY1vr7n7sMxwumpzETVjltOAHUMsupxkFmwYgdd50fpJk7Y4CSDrKx7dFxQM5l/rqkG/3lifOqlzKI6GKrIaOE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745398200; c=relaxed/simple; bh=4zszpaiYY27dFluclG+Yse6bg/94yxXQ+mZgQjv8N7A=; h=Message-ID:Date:MIME-Version:Cc:Subject:To:References:From: In-Reply-To:Content-Type; b=S5D1Ve1hwGTeVKEyZSAJG7PUlWqCGo16eHhioUsr7GAy1MjqrhhpbQYDn4nlKSR5eOMOALVVd+BujQQ5dW9yPp2TX08vP9BDqeVejGOuX6kNi5UW9IJOe7IcLfIyrJZX4qedzkHEdb8FzckMRD9JqoMbfEfO4AOg9Hdkj3+xVpE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l+DoXT8S; 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="l+DoXT8S" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 99106C4CEE2; Wed, 23 Apr 2025 08:49:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745398199; bh=4zszpaiYY27dFluclG+Yse6bg/94yxXQ+mZgQjv8N7A=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=l+DoXT8SqoV1o9WeGu2MbRY0S8I6z3IutO46zrA2W4qS4LXOIwK4yEqUZCXJoBC+1 oF74AVEbvd7OP4l/5EDXGKBmXAkfr9DRrXsLQ0qYphY2uo09gPtwDYTmKjQVyL7wog PleM+jDiqfT6hckTpbid0LGpNBC9JaOotDv8TaUjHGdboxWPBsgjIBCXpI2psV69JP KQ3W91wTrNNCviFeR6JiZ7ciPcWMXJZpANt63y96EY8LXAf/K4p14BnZHw1Z5k23jN FzjKv3aZ9jAXGhjWDd6M0io+nn34mJxQ5wvqz4hppF2TwHLf6bqh34OyxkYvFA8LsH zMkRsgt0qL87g== Message-ID: Date: Wed, 23 Apr 2025 16:49:55 +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, Daeho Jeong Subject: Re: [f2fs-dev] [PATCH] f2fs: handle error cases of memory donation To: Daeho Jeong , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com References: <20250422191128.1346260-1-daeho43@gmail.com> Content-Language: en-US From: Chao Yu In-Reply-To: <20250422191128.1346260-1-daeho43@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/23/25 03:11, Daeho Jeong wrote: > From: Daeho Jeong > > In cases of removing memory donation, we need to handle some error cases > like ENOENT and EACCES (indicating the range already has been donated). > > Signed-off-by: Daeho Jeong > --- > fs/f2fs/f2fs.h | 1 + > fs/f2fs/file.c | 21 ++++++++++++++------- > fs/f2fs/shrinker.c | 5 +++++ > 3 files changed, 20 insertions(+), 7 deletions(-) > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index f1576dc6ec67..e4b39550f380 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -821,6 +821,7 @@ enum { > FI_ATOMIC_DIRTIED, /* indicate atomic file is dirtied */ > FI_ATOMIC_REPLACE, /* indicate atomic replace */ > FI_OPENED_FILE, /* indicate file has been opened */ > + FI_PAGE_DONATED, /* indicate pages of file has been donated */ > FI_MAX, /* max flag, never be used */ > }; > > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > index abbcbb5865a3..0807f8e97492 100644 > --- a/fs/f2fs/file.c > +++ b/fs/f2fs/file.c > @@ -2464,19 +2464,20 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) > return ret; > } > > -static void f2fs_keep_noreuse_range(struct inode *inode, > +static int f2fs_keep_noreuse_range(struct inode *inode, > loff_t offset, loff_t len) > { > struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > u64 max_bytes = F2FS_BLK_TO_BYTES(max_file_blocks(inode)); > u64 start, end; > + int ret = 0; > > if (!S_ISREG(inode->i_mode)) > - return; > + return 0; > > if (offset >= max_bytes || len > max_bytes || > (offset + len) > max_bytes) > - return; > + return 0; > > start = offset >> PAGE_SHIFT; > end = DIV_ROUND_UP(offset + len, PAGE_SIZE); > @@ -2484,7 +2485,7 @@ static void f2fs_keep_noreuse_range(struct inode *inode, > inode_lock(inode); > if (f2fs_is_atomic_file(inode)) { > inode_unlock(inode); > - return; > + return 0; > } > > spin_lock(&sbi->inode_lock[DONATE_INODE]); > @@ -2493,7 +2494,10 @@ static void f2fs_keep_noreuse_range(struct inode *inode, > if (!list_empty(&F2FS_I(inode)->gdonate_list)) { > list_del_init(&F2FS_I(inode)->gdonate_list); > sbi->donate_files--; > - } > + if (is_inode_flag_set(inode, FI_PAGE_DONATED)) > + ret = -EACCES; If caller has no enough permission, it will return EACCES as well, to avoid conflict, what do you think of returning EALREADY? or use a wrapper of this macro like EFSCORRUPTED? Thanks, > + } else > + ret = -ENOENT; > } else { > if (list_empty(&F2FS_I(inode)->gdonate_list)) { > list_add_tail(&F2FS_I(inode)->gdonate_list, > @@ -2505,9 +2509,12 @@ static void f2fs_keep_noreuse_range(struct inode *inode, > } > F2FS_I(inode)->donate_start = start; > F2FS_I(inode)->donate_end = end - 1; > + clear_inode_flag(inode, FI_PAGE_DONATED); > } > spin_unlock(&sbi->inode_lock[DONATE_INODE]); > inode_unlock(inode); > + > + return ret; > } > > static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg) > @@ -5236,8 +5243,8 @@ static int f2fs_file_fadvise(struct file *filp, loff_t offset, loff_t len, > f2fs_compressed_file(inode))) > f2fs_invalidate_compress_pages(F2FS_I_SB(inode), inode->i_ino); > else if (advice == POSIX_FADV_NOREUSE) > - f2fs_keep_noreuse_range(inode, offset, len); > - return 0; > + err = f2fs_keep_noreuse_range(inode, offset, len); > + return err; > } > > #ifdef CONFIG_COMPAT > diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c > index 9c8d3aee89af..1fa6619db40f 100644 > --- a/fs/f2fs/shrinker.c > +++ b/fs/f2fs/shrinker.c > @@ -186,8 +186,13 @@ static unsigned int do_reclaim_caches(struct f2fs_sb_info *sbi, > > len = fi->donate_end - fi->donate_start + 1; > npages = npages < len ? 0 : npages - len; > + > + inode_lock(inode); > invalidate_inode_pages2_range(inode->i_mapping, > fi->donate_start, fi->donate_end); > + set_inode_flag(inode, FI_PAGE_DONATED); > + inode_unlock(inode); > + > iput(inode); > cond_resched(); > }