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raid5-ppl: move no_mem_stripes to struct ppl_conf 

Use a single no_mem_stripes list instead of per member device lists for
handling stripes that need retrying in case of failed io_unit
allocation. Because io_units are allocated from a memory pool shared
between all member disks, the no_mem_stripes list should be checked when
an io_unit for any member is freed. This fixes a deadlock that could
happen if there are stripes in more than one no_mem_stripes list.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Artur Paszkiewicz 2017-04-04 13:13:56 +02:00 committed by Shaohua Li
parent 0c9d5b127f
commit 94568f64af
1 changed files with 23 additions and 13 deletions
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36
drivers/md/raid5-ppl.c
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@ -107,6 +107,10 @@ struct ppl_conf {
/* used only for recovery */
int recovered_entries;
int mismatch_count;
/* stripes to retry if failed to allocate io_unit */
struct list_head no_mem_stripes;
spinlock_t no_mem_stripes_lock;
};
struct ppl_log {
@ -119,8 +123,6 @@ struct ppl_log {
* always at the end of io_list */
spinlock_t io_list_lock;
struct list_head io_list; /* all io_units of this log */
struct list_head no_mem_stripes;/* stripes to retry if failed to
* allocate io_unit */
};
#define PPL_IO_INLINE_BVECS 32
@ -347,9 +349,9 @@ int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh)
atomic_inc(&sh->count);
if (ppl_log_stripe(log, sh)) {
spin_lock_irq(&log->io_list_lock);
list_add_tail(&sh->log_list, &log->no_mem_stripes);
spin_unlock_irq(&log->io_list_lock);
spin_lock_irq(&ppl_conf->no_mem_stripes_lock);
list_add_tail(&sh->log_list, &ppl_conf->no_mem_stripes);
spin_unlock_irq(&ppl_conf->no_mem_stripes_lock);
}
mutex_unlock(&log->io_mutex);
@ -492,25 +494,32 @@ void ppl_write_stripe_run(struct r5conf *conf)
static void ppl_io_unit_finished(struct ppl_io_unit *io)
{
struct ppl_log *log = io->log;
struct ppl_conf *ppl_conf = log->ppl_conf;
unsigned long flags;
pr_debug("%s: seq: %llu\n", __func__, io->seq);
spin_lock_irqsave(&log->io_list_lock, flags);
local_irq_save(flags);
spin_lock(&log->io_list_lock);
list_del(&io->log_sibling);
mempool_free(io, log->ppl_conf->io_pool);
spin_unlock(&log->io_list_lock);
if (!list_empty(&log->no_mem_stripes)) {
struct stripe_head *sh = list_first_entry(&log->no_mem_stripes,
struct stripe_head,
log_list);
mempool_free(io, ppl_conf->io_pool);
spin_lock(&ppl_conf->no_mem_stripes_lock);
if (!list_empty(&ppl_conf->no_mem_stripes)) {
struct stripe_head *sh;
sh = list_first_entry(&ppl_conf->no_mem_stripes,
struct stripe_head, log_list);
list_del_init(&sh->log_list);
set_bit(STRIPE_HANDLE, &sh->state);
raid5_release_stripe(sh);
}
spin_unlock(&ppl_conf->no_mem_stripes_lock);
spin_unlock_irqrestore(&log->io_list_lock, flags);
local_irq_restore(flags);
}
void ppl_stripe_write_finished(struct stripe_head *sh)
@ -1135,6 +1144,8 @@ int ppl_init_log(struct r5conf *conf)
}
atomic64_set(&ppl_conf->seq, 0);
INIT_LIST_HEAD(&ppl_conf->no_mem_stripes);
spin_lock_init(&ppl_conf->no_mem_stripes_lock);
if (!mddev->external) {
ppl_conf->signature = ~crc32c_le(~0, mddev->uuid, sizeof(mddev->uuid));
@ -1150,7 +1161,6 @@ int ppl_init_log(struct r5conf *conf)
mutex_init(&log->io_mutex);
spin_lock_init(&log->io_list_lock);
INIT_LIST_HEAD(&log->io_list);
INIT_LIST_HEAD(&log->no_mem_stripes);
log->ppl_conf = ppl_conf;
log->rdev = rdev;