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f2fs: fix to cover io->bio with io_rwsem

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In the f2fs_wait_on_page_writeback, io->bio should be covered by io_rwsem.
Otherwise, the bio pointer can become a dangling pointer due to data races.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2014-04-02 09:04:42 +09:00
parent d54c795b49
commit ce23447fe5
1 changed files with 2 additions and 3 deletions
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5
fs/f2fs/segment.c
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@ -1049,15 +1049,14 @@ static inline bool is_merged_page(struct f2fs_sb_info *sbi,
{
enum page_type btype = PAGE_TYPE_OF_BIO(type);
struct f2fs_bio_info *io = &sbi->write_io[btype];
struct bio *bio = io->bio;
struct bio_vec *bvec;
int i;
down_read(&io->io_rwsem);
if (!bio)
if (!io->bio)
goto out;
bio_for_each_segment_all(bvec, bio, i) {
bio_for_each_segment_all(bvec, io->bio, i) {
if (page == bvec->bv_page) {
up_read(&io->io_rwsem);
return true;