evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

f2fs: Fix accounting for unusable blocks

Browse source 
Fixes possible underflows when dealing with unusable blocks.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daniel Rosenberg 2019-05-29 17:49:05 -07:00 • committed by Jaegeuk Kim
parent 1b5f829795
commit d36eb2bf50
1 changed files with 10 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
fs/f2fs/f2fs.h
View file

@ -1836,8 +1836,12 @@ 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 -= sbi->unusable_block_count;
else
avail_user_block_count = 0;
}
if (unlikely(sbi->total_valid_block_count > avail_user_block_count)) {
diff = sbi->total_valid_block_count - avail_user_block_count;
if (diff > *count)
@ -2037,7 +2041,7 @@ 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) {
@ -2064,10 +2068,11 @@ 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;
}