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raid5: handle expansion/resync case with stripe batching 

expansion/resync can grab a stripe when the stripe is in batch list. Since all
stripes in batch list must be in the same state, we can't allow some stripes
run into expansion/resync. So we delay expansion/resync for stripe in batch
list.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
shli@kernel.org 2014-12-15 12:57:04 +11:00 committed by NeilBrown
parent 72ac733015
commit dabc4ec6ba
2 changed files with 21 additions and 8 deletions
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22
drivers/md/raid5.c
View File

@ -3440,8 +3440,10 @@ unhash:
struct stripe_head, batch_list);
list_del_init(&sh->batch_list);
sh->state = head_sh->state & (~((1 << STRIPE_ACTIVE) |
(1 << STRIPE_PREREAD_ACTIVE)));
set_mask_bits(&sh->state, ~STRIPE_EXPAND_SYNC_FLAG,
head_sh->state & ~((1 << STRIPE_ACTIVE) |
(1 << STRIPE_PREREAD_ACTIVE) |
STRIPE_EXPAND_SYNC_FLAG));
sh->check_state = head_sh->check_state;
sh->reconstruct_state = head_sh->reconstruct_state;
for (i = 0; i < sh->disks; i++) {
@ -3453,6 +3455,8 @@ unhash:
spin_lock_irq(&sh->stripe_lock);
sh->batch_head = NULL;
spin_unlock_irq(&sh->stripe_lock);
if (sh->state & STRIPE_EXPAND_SYNC_FLAG)
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
}
@ -3460,6 +3464,8 @@ unhash:
head_sh->batch_head = NULL;
spin_unlock_irq(&head_sh->stripe_lock);
wake_up_nr(&conf->wait_for_overlap, wakeup_nr);
if (head_sh->state & STRIPE_EXPAND_SYNC_FLAG)
set_bit(STRIPE_HANDLE, &head_sh->state);
}
static void handle_stripe_dirtying(struct r5conf *conf,
@ -3927,8 +3933,8 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
memset(s, 0, sizeof(*s));
s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state) && !sh->batch_head;
s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head;
s->failed_num[0] = -1;
s->failed_num[1] = -1;
@ -4150,9 +4156,11 @@ static void check_break_stripe_batch_list(struct stripe_head *sh)
struct stripe_head, batch_list);
list_del_init(&sh->batch_list);
sh->state = head_sh->state & ~((1 << STRIPE_ACTIVE) |
set_mask_bits(&sh->state, ~STRIPE_EXPAND_SYNC_FLAG,
head_sh->state & ~((1 << STRIPE_ACTIVE) |
(1 << STRIPE_PREREAD_ACTIVE) |
(1 << STRIPE_DEGRADED));
(1 << STRIPE_DEGRADED) |
STRIPE_EXPAND_SYNC_FLAG));
sh->check_state = head_sh->check_state;
sh->reconstruct_state = head_sh->reconstruct_state;
for (i = 0; i < sh->disks; i++)
@ -4194,7 +4202,7 @@ static void handle_stripe(struct stripe_head *sh)
check_break_stripe_batch_list(sh);
if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state) && !sh->batch_head) {
spin_lock(&sh->stripe_lock);
/* Cannot process 'sync' concurrently with 'discard' */
if (!test_bit(STRIPE_DISCARD, &sh->state) &&

5
drivers/md/raid5.h
View File

@ -339,6 +339,11 @@ enum {
STRIPE_BATCH_ERR,
};
#define STRIPE_EXPAND_SYNC_FLAG \
((1 << STRIPE_EXPAND_SOURCE) |\
(1 << STRIPE_EXPAND_READY) |\
(1 << STRIPE_EXPANDING) |\
(1 << STRIPE_SYNC_REQUESTED))
/*
* Operation request flags
*/