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authorShin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>2020-08-19 04:34:48 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2020-09-09 06:31:33 +0300
commit123aaf774f70ba48fb9ab064b6ce75a9b64d7b85 (patch)
tree2e44c6a19c7af918f74464b51dd26830dd7c7955 /fs/f2fs
parent34d4ddd359dbcdf6c5fb3f85a179243d7a1cb7f8 (diff)
downloadlinux-123aaf774f70ba48fb9ab064b6ce75a9b64d7b85.tar.xz
f2fs: Fix type of section block count variables
Commit da52f8ade40b ("f2fs: get the right gc victim section when section has several segments") added code to count blocks of each section using variables with type 'unsigned short', which has 2 bytes size in many systems. However, the counts can be larger than the 2 bytes range and type conversion results in wrong values. Especially when the f2fs sections have blocks as many as USHRT_MAX + 1, the count is handled as 0. This triggers eternal loop in init_dirty_segmap() at mount system call. Fix this by changing the type of the variables to block_t. Fixes: da52f8ade40b ("f2fs: get the right gc victim section when section has several segments") Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/segment.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index a65d357f89a9..e247a5ef3713 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -799,7 +799,7 @@ static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
if (__is_large_section(sbi)) {
unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
- unsigned short valid_blocks =
+ block_t valid_blocks =
get_valid_blocks(sbi, segno, true);
f2fs_bug_on(sbi, unlikely(!valid_blocks ||
@@ -815,7 +815,7 @@ static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
enum dirty_type dirty_type)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
- unsigned short valid_blocks;
+ block_t valid_blocks;
if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
dirty_i->nr_dirty[dirty_type]--;
@@ -4316,8 +4316,8 @@ static void init_dirty_segmap(struct f2fs_sb_info *sbi)
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
struct free_segmap_info *free_i = FREE_I(sbi);
unsigned int segno = 0, offset = 0, secno;
- unsigned short valid_blocks;
- unsigned short blks_per_sec = BLKS_PER_SEC(sbi);
+ block_t valid_blocks;
+ block_t blks_per_sec = BLKS_PER_SEC(sbi);
while (1) {
/* find dirty segment based on free segmap */