From: Jaegeuk Kim <jaegeuk@kernel.org>
To: Chao Yu <yuchao0@huawei.com>
Cc: linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com,
Daeho Jeong <daehojeong@google.com>,
linux-kernel@vger.kernel.org
Subject: Re: [f2fs-dev] [PATCH] f2fs: change the way of handling range.len in F2FS_IOC_SEC_TRIM_FILE
Date: Thu, 9 Jul 2020 20:52:15 -0700 [thread overview]
Message-ID: <20200710035215.GI545837@google.com> (raw)
In-Reply-To: <ede6620c-6fc9-797d-e3ea-e630eb76b309@huawei.com>
On 07/10, Chao Yu wrote:
> On 2020/7/10 11:31, Jaegeuk Kim wrote:
> > On 07/10, Chao Yu wrote:
> >> On 2020/7/10 11:02, Jaegeuk Kim wrote:
> >>> On 07/10, Daeho Jeong wrote:
> >>>> From: Daeho Jeong <daehojeong@google.com>
> >>>>
> >>>> Changed the way of handling range.len of F2FS_IOC_SEC_TRIM_FILE.
> >>>> 1. Added -1 value support for range.len to signify the end of file.
> >>>> 2. If the end of the range passes over the end of file, it means until
> >>>> the end of file.
> >>>> 3. ignored the case of that range.len is zero to prevent the function
> >>>> from making end_addr zero and triggering different behaviour of
> >>>> the function.
> >>>>
> >>>> Signed-off-by: Daeho Jeong <daehojeong@google.com>
> >>>> ---
> >>>> fs/f2fs/file.c | 16 +++++++---------
> >>>> 1 file changed, 7 insertions(+), 9 deletions(-)
> >>>>
> >>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> >>>> index 368c80f8e2a1..1c4601f99326 100644
> >>>> --- a/fs/f2fs/file.c
> >>>> +++ b/fs/f2fs/file.c
> >>>> @@ -3813,21 +3813,19 @@ static int f2fs_sec_trim_file(struct file *filp, unsigned long arg)
> >>>> file_start_write(filp);
> >>>> inode_lock(inode);
> >>>>
> >>>> - if (f2fs_is_atomic_file(inode) || f2fs_compressed_file(inode)) {
> >>>> + if (f2fs_is_atomic_file(inode) || f2fs_compressed_file(inode) ||
> >>>> + range.start >= inode->i_size) {
> >>>> ret = -EINVAL;
> >>>> goto err;
> >>>> }
> >>>>
> >>>> - if (range.start >= inode->i_size) {
> >>>> - ret = -EINVAL;
> >>>> + if (range.len == 0)
> >>>> goto err;
> >>>> - }
> >>>>
> >>>> - if (inode->i_size - range.start < range.len) {
> >>>> - ret = -E2BIG;
> >>>> - goto err;
> >>>> - }
> >>>> - end_addr = range.start + range.len;
> >>>> + if (range.len == (u64)-1 || inode->i_size - range.start < range.len)
> >>>> + end_addr = inode->i_size;
> >>
> >> We can remove 'range.len == (u64)-1' condition since later condition can cover
> >> this?
> >>
> >>>
> >>> Hmm, what if there are blocks beyond i_size? Do we need to check i_blocks for
> >>
> >> The blocks beyond i_size will never be written, there won't be any valid message
> >> there, so we don't need to worry about that.
> >
> > I don't think we have a way to guarantee the order of i_size and block
> > allocation in f2fs. See f2fs_write_begin and f2fs_write_end.
>
> However, write_begin & write_end are covered by inode_lock, it could not be
> racy with inode size check in f2fs_sec_trim_file() as it hold inode_lock as
> well?
Like Daeho said, write_begin -> checkpoint -> power-cut can give bigger i_blocks
than i_size.
>
> >
> >>
> >> Thanks,
> >>
> >>> ending criteria?
> >>>
> >>>> + else
> >>>> + end_addr = range.start + range.len;
> >>>>
> >>>> to_end = (end_addr == inode->i_size);
> >>>> if (!IS_ALIGNED(range.start, F2FS_BLKSIZE) ||
> >>>> --
> >>>> 2.27.0.383.g050319c2ae-goog
> >>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> Linux-f2fs-devel mailing list
> >>>> Linux-f2fs-devel@lists.sourceforge.net
> >>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >>>
> >>>
> >>> _______________________________________________
> >>> Linux-f2fs-devel mailing list
> >>> Linux-f2fs-devel@lists.sourceforge.net
> >>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >>> .
> >>>
> > .
> >
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next prev parent reply other threads:[~2020-07-10 3:52 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-10 2:15 [f2fs-dev] [PATCH] f2fs: change the way of handling range.len in F2FS_IOC_SEC_TRIM_FILE Daeho Jeong
2020-07-10 3:02 ` Jaegeuk Kim
2020-07-10 3:17 ` Daeho Jeong
2020-07-10 3:20 ` Jaegeuk Kim
2020-07-10 3:25 ` Eric Biggers
2020-07-10 3:29 ` Jaegeuk Kim
2020-07-10 3:21 ` Chao Yu
2020-07-10 3:31 ` Jaegeuk Kim
2020-07-10 3:36 ` Chao Yu
2020-07-10 3:52 ` Jaegeuk Kim [this message]
2020-07-10 4:26 ` Daeho Jeong
2020-07-10 6:31 ` Chao Yu
2020-07-10 6:46 ` Jaegeuk Kim
2020-07-10 7:29 ` Chao Yu
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