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f2fs: fix to flush multiple device in checkpoint 

If f2fs manages multiple devices, in checkpoint, we need to issue flush
in those devices which contain dirty data/node in their cache before
we write checkpoint region, otherwise, filesystem metadata could be
corrupted if hitting SPO after checkpoint.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-09-29 13:59:39 +08:00 committed by Jaegeuk Kim
parent 39d787bec4
commit 1228b482c4
4 changed files with 41 additions and 0 deletions
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6
fs/f2fs/checkpoint.c
View File

@ -1172,6 +1172,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
struct super_block *sb = sbi->sb;
struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
u64 kbytes_written;
int err;
/* Flush all the NAT/SIT pages */
while (get_pages(sbi, F2FS_DIRTY_META)) {
@ -1265,6 +1266,11 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
/* flush all device cache */
err = f2fs_flush_device_cache(sbi);
if (err)
return err;
/* write out checkpoint buffer at block 0 */
update_meta_page(sbi, ckpt, start_blk++);

3
fs/f2fs/f2fs.h
View File

@ -1122,6 +1122,8 @@ struct f2fs_sb_info {
struct list_head s_list;
int s_ndevs; /* number of devices */
struct f2fs_dev_info *devs; /* for device list */
unsigned int dirty_device; /* for checkpoint data flush */
spinlock_t dev_lock; /* protect dirty_device */
struct mutex umount_mutex;
unsigned int shrinker_run_no;
@ -2527,6 +2529,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need);
void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi);
int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino);
int create_flush_cmd_control(struct f2fs_sb_info *sbi);
int f2fs_flush_device_cache(struct f2fs_sb_info *sbi);
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);

29
fs/f2fs/segment.c
View File

@ -659,6 +659,28 @@ void destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free)
}
}
int f2fs_flush_device_cache(struct f2fs_sb_info *sbi)
{
int ret = 0, i;
if (!sbi->s_ndevs)
return 0;
for (i = 1; i < sbi->s_ndevs; i++) {
if (!f2fs_test_bit(i, (char *)&sbi->dirty_device))
continue;
ret = __submit_flush_wait(sbi, FDEV(i).bdev);
if (ret)
break;
spin_lock(&sbi->dev_lock);
f2fs_clear_bit(i, (char *)&sbi->dirty_device);
spin_unlock(&sbi->dev_lock);
}
return ret;
}
static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
enum dirty_type dirty_type)
{
@ -2402,6 +2424,13 @@ static void update_device_state(struct f2fs_io_info *fio)
/* update device state for fsync */
set_dirty_device(sbi, fio->ino, devidx, FLUSH_INO);
/* update device state for checkpoint */
if (!f2fs_test_bit(devidx, (char *)&sbi->dirty_device)) {
spin_lock(&sbi->dev_lock);
f2fs_set_bit(devidx, (char *)&sbi->dirty_device);
spin_unlock(&sbi->dev_lock);
}
}
static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)

3
fs/f2fs/super.c
View File

@ -1965,6 +1965,9 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
for (j = HOT; j < NR_TEMP_TYPE; j++)
mutex_init(&sbi->wio_mutex[i][j]);
spin_lock_init(&sbi->cp_lock);
sbi->dirty_device = 0;
spin_lock_init(&sbi->dev_lock);
}
static int init_percpu_info(struct f2fs_sb_info *sbi)