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md/raid5-cache: release the stripe_head at the appropriate location 

If we released the 'stripe_head' in r5c_recovery_flush_log,
ctx->cached_list will both release the data-parity stripes and
data-only stripes, which will become empty.
And we also need to use the data-only stripes in
r5c_recovery_rewrite_data_only_stripes, so we should wait util rewrite
data-only stripes is done before releasing them.

Reviewed-by: Zhengyuan Liu <liuzhengyuan@kylinos.cn>
Reviewed-by: Song Liu <songliubraving@fb.com>
Signed-off-by: JackieLiu <liuyun01@kylinos.cn>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
JackieLiu 2016-11-28 16:19:20 +08:00 committed by Shaohua Li
parent fc833c2a2f
commit bc8f167f9c
1 changed files with 7 additions and 6 deletions
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13
drivers/md/raid5-cache.c
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@ -1948,7 +1948,7 @@ static void r5c_recovery_load_one_stripe(struct r5l_log *log,
static int r5c_recovery_flush_log(struct r5l_log *log,
struct r5l_recovery_ctx *ctx)
{
struct stripe_head *sh, *next;
struct stripe_head *sh;
int ret = 0;
/* scan through the log */
@ -1977,11 +1977,9 @@ static int r5c_recovery_flush_log(struct r5l_log *log,
r5c_recovery_replay_stripes(&ctx->cached_list, ctx);
/* load data-only stripes to stripe cache */
list_for_each_entry_safe(sh, next, &ctx->cached_list, lru) {
list_for_each_entry(sh, &ctx->cached_list, lru) {
WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state));
r5c_recovery_load_one_stripe(log, sh);
list_del_init(&sh->lru);
raid5_release_stripe(sh);
ctx->data_only_stripes++;
}
@ -2061,7 +2059,7 @@ static int
r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log,
struct r5l_recovery_ctx *ctx)
{
struct stripe_head *sh;
struct stripe_head *sh, *next;
struct mddev *mddev = log->rdev->mddev;
struct page *page;
@ -2073,7 +2071,7 @@ r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log,
}
ctx->seq += 10;
list_for_each_entry(sh, &ctx->cached_list, lru) {
list_for_each_entry_safe(sh, next, &ctx->cached_list, lru) {
struct r5l_meta_block *mb;
int i;
int offset;
@ -2119,6 +2117,9 @@ r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log,
sh->log_start = ctx->pos;
ctx->pos = write_pos;
ctx->seq += 1;
list_del_init(&sh->lru);
raid5_release_stripe(sh);
}
__free_page(page);
return 0;