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f2fs: stop gc/discard thread in prior during umount

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This patch resolves kernel panic for xfstests/081, caused by recent f2fs_bug_on

 f2fs: add f2fs_bug_on in __remove_discard_cmd

For fixing, we will stop gc/discard thread in prior in ->kill_sb in order to
avoid referring and releasing race among them.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-06-29 23:17:45 +08:00 committed by Jaegeuk Kim
parent daeb433e42
commit cce1325247
3 changed files with 18 additions and 9 deletions
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1
fs/f2fs/f2fs.h
View File

@ -2293,6 +2293,7 @@ void destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free);
void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr);
bool is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr);
void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new);
void stop_discard_thread(struct f2fs_sb_info *sbi);
void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc);
void release_discard_addrs(struct f2fs_sb_info *sbi);

19
fs/f2fs/segment.c
View File

@ -1065,6 +1065,18 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
__wait_one_discard_bio(sbi, dc);
}
void stop_discard_thread(struct f2fs_sb_info *sbi)
{
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
if (dcc && dcc->f2fs_issue_discard) {
struct task_struct *discard_thread = dcc->f2fs_issue_discard;
dcc->f2fs_issue_discard = NULL;
kthread_stop(discard_thread);
}
}
/* This comes from f2fs_put_super */
void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
{
@ -1422,12 +1434,7 @@ static void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
if (!dcc)
return;
if (dcc->f2fs_issue_discard) {
struct task_struct *discard_thread = dcc->f2fs_issue_discard;
dcc->f2fs_issue_discard = NULL;
kthread_stop(discard_thread);
}
stop_discard_thread(sbi);
kfree(dcc);
SM_I(sbi)->dcc_info = NULL;

7
fs/f2fs/super.c
View File

@ -566,8 +566,6 @@ static void f2fs_put_super(struct super_block *sb)
struct f2fs_sb_info *sbi = F2FS_SB(sb);
int i;
stop_gc_thread(sbi);
/* prevent remaining shrinker jobs */
mutex_lock(&sbi->umount_mutex);
@ -1976,8 +1974,11 @@ static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
static void kill_f2fs_super(struct super_block *sb)
{
if (sb->s_root)
if (sb->s_root) {
set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
stop_gc_thread(F2FS_SB(sb));
stop_discard_thread(F2FS_SB(sb));
}
kill_block_super(sb);
}