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 <daehoje...@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 <daehoje...@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-de...@lists.sourceforge.net
> >>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >>>
> >>>
> >>> _______________________________________________
> >>> Linux-f2fs-devel mailing list
> >>> linux-f2fs-de...@lists.sourceforge.net
> >>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >>> .
> >>>
> > .
> >
