On 06/03, Chao Yu wrote:
> On 2019/5/30 8:49, Daniel Rosenberg wrote:
> > Fixes possible underflows when dealing with unusable blocks.
> >
> > Signed-off-by: Daniel Rosenberg <dro...@google.com>
> > ---
> > fs/f2fs/f2fs.h | 15 ++++++++++-----
> > 1 file changed, 10 insertions(+), 5 deletions(-)
> >
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 9b3d9977cd1ef..a39cc4ffeb4b1 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -1769,8 +1769,12 @@ static inline int inc_valid_block_count(struct
> > f2fs_sb_info *sbi,
> >
> > if (!__allow_reserved_blocks(sbi, inode, true))
> > avail_user_block_count -= F2FS_OPTION(sbi).root_reserved_blocks;
> > - if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> > - avail_user_block_count -= sbi->unusable_block_count;
> > + if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
> > + if (avail_user_block_count > sbi->unusable_block_count)
> > + avail_user_block_count = 0;
>
> avail_user_block_count -= sbi->unusable_block_count;
>
> > + else
> > + avail_user_block_count -= sbi->unusable_block_count;
>
> avail_user_block_count = 0;
>
I fixed this.
Thanks,
> Thanks,
>
> > + }
> > if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) {
> > diff = sbi->total_valid_block_count - avail_user_block_count;
> > if (diff > *count)
> > @@ -1970,7 +1974,7 @@ static inline int inc_valid_node_count(struct
> > f2fs_sb_info *sbi,
> > struct inode *inode, bool is_inode)
> > {
> > block_t valid_block_count;
> > - unsigned int valid_node_count;
> > + unsigned int valid_node_count, user_block_count;
> > int err;
> >
> > if (is_inode) {
> > @@ -1997,10 +2001,11 @@ static inline int inc_valid_node_count(struct
> > f2fs_sb_info *sbi,
> >
> > if (!__allow_reserved_blocks(sbi, inode, false))
> > valid_block_count += F2FS_OPTION(sbi).root_reserved_blocks;
> > + user_block_count = sbi->user_block_count;
> > if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> > - valid_block_count += sbi->unusable_block_count;
> > + user_block_count -= sbi->unusable_block_count;
> >
> > - if (unlikely(valid_block_count > sbi->user_block_count)) {
> > + if (unlikely(valid_block_count > user_block_count)) {
> > spin_unlock(&sbi->stat_lock);
> > goto enospc;
> > }
> >
