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path: root/drivers/md/bcache
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-rw-r--r--drivers/md/bcache/alloc.c5
-rw-r--r--drivers/md/bcache/bcache.h7
-rw-r--r--drivers/md/bcache/bset.c2
-rw-r--r--drivers/md/bcache/bset.h3
-rw-r--r--drivers/md/bcache/btree.c12
-rw-r--r--drivers/md/bcache/journal.c4
-rw-r--r--drivers/md/bcache/request.c17
-rw-r--r--drivers/md/bcache/stats.c10
-rw-r--r--drivers/md/bcache/super.c144
-rw-r--r--drivers/md/bcache/sysfs.c22
-rw-r--r--drivers/md/bcache/writeback.c14
-rw-r--r--drivers/md/bcache/writeback.h19
12 files changed, 189 insertions, 70 deletions
diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c
index 6f776823b9ba..a1df0d95151c 100644
--- a/drivers/md/bcache/alloc.c
+++ b/drivers/md/bcache/alloc.c
@@ -377,7 +377,10 @@ retry_invalidate:
if (!fifo_full(&ca->free_inc))
goto retry_invalidate;
- bch_prio_write(ca);
+ if (bch_prio_write(ca, false) < 0) {
+ ca->invalidate_needs_gc = 1;
+ wake_up_gc(ca->set);
+ }
}
}
out:
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index e30a983a68cd..2e396954b39d 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -264,7 +264,7 @@ struct bcache_device {
#define BCACHE_DEV_UNLINK_DONE 2
#define BCACHE_DEV_WB_RUNNING 3
#define BCACHE_DEV_RATE_DW_RUNNING 4
- unsigned int nr_stripes;
+ int nr_stripes;
unsigned int stripe_size;
atomic_t *stripe_sectors_dirty;
unsigned long *full_dirty_stripes;
@@ -329,6 +329,9 @@ struct cached_dev {
*/
atomic_t has_dirty;
+#define BCH_CACHE_READA_ALL 0
+#define BCH_CACHE_READA_META_ONLY 1
+ unsigned int cache_readahead_policy;
struct bch_ratelimit writeback_rate;
struct delayed_work writeback_rate_update;
@@ -977,7 +980,7 @@ bool bch_cached_dev_error(struct cached_dev *dc);
__printf(2, 3)
bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...);
-void bch_prio_write(struct cache *ca);
+int bch_prio_write(struct cache *ca, bool wait);
void bch_write_bdev_super(struct cached_dev *dc, struct closure *parent);
extern struct workqueue_struct *bcache_wq;
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c
index 268f1b685084..ec48cf86cab6 100644
--- a/drivers/md/bcache/bset.c
+++ b/drivers/md/bcache/bset.c
@@ -321,7 +321,7 @@ int bch_btree_keys_alloc(struct btree_keys *b,
b->page_order = page_order;
- t->data = (void *) __get_free_pages(gfp, b->page_order);
+ t->data = (void *) __get_free_pages(__GFP_COMP|gfp, b->page_order);
if (!t->data)
goto err;
diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h
index c71365e7c1fa..a50dcfda656f 100644
--- a/drivers/md/bcache/bset.h
+++ b/drivers/md/bcache/bset.h
@@ -397,7 +397,8 @@ void bch_btree_keys_stats(struct btree_keys *b, struct bset_stats *state);
/* Bkey utility code */
-#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, (i)->keys)
+#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, \
+ (unsigned int)(i)->keys)
static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned int idx)
{
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 5cf3247e8afb..b60cb7a99b18 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -719,6 +719,8 @@ static unsigned long bch_mca_scan(struct shrinker *shrink,
* IO can always make forward progress:
*/
nr /= c->btree_pages;
+ if (nr == 0)
+ nr = 1;
nr = min_t(unsigned long, nr, mca_can_free(c));
i = 0;
@@ -834,7 +836,7 @@ int bch_btree_cache_alloc(struct cache_set *c)
mutex_init(&c->verify_lock);
c->verify_ondisk = (void *)
- __get_free_pages(GFP_KERNEL, ilog2(bucket_pages(c)));
+ __get_free_pages(GFP_KERNEL|__GFP_COMP, ilog2(bucket_pages(c)));
c->verify_data = mca_bucket_alloc(c, &ZERO_KEY, GFP_KERNEL);
@@ -1436,7 +1438,7 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
if (__set_blocks(n1, n1->keys + n2->keys,
block_bytes(b->c)) >
btree_blocks(new_nodes[i]))
- goto out_nocoalesce;
+ goto out_unlock_nocoalesce;
keys = n2->keys;
/* Take the key of the node we're getting rid of */
@@ -1465,7 +1467,7 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
if (__bch_keylist_realloc(&keylist,
bkey_u64s(&new_nodes[i]->key)))
- goto out_nocoalesce;
+ goto out_unlock_nocoalesce;
bch_btree_node_write(new_nodes[i], &cl);
bch_keylist_add(&keylist, &new_nodes[i]->key);
@@ -1511,6 +1513,10 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
/* Invalidated our iterator */
return -EINTR;
+out_unlock_nocoalesce:
+ for (i = 0; i < nodes; i++)
+ mutex_unlock(&new_nodes[i]->write_lock);
+
out_nocoalesce:
closure_sync(&cl);
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 33556acdcf9c..e145c2b1e2c9 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -865,8 +865,8 @@ int bch_journal_alloc(struct cache_set *c)
j->w[1].c = c;
if (!(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL)) ||
- !(j->w[0].data = (void *) __get_free_pages(GFP_KERNEL, JSET_BITS)) ||
- !(j->w[1].data = (void *) __get_free_pages(GFP_KERNEL, JSET_BITS)))
+ !(j->w[0].data = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP, JSET_BITS)) ||
+ !(j->w[1].data = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP, JSET_BITS)))
return -ENOMEM;
return 0;
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 41adcd1546f1..4045ae748f17 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -391,13 +391,20 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
goto skip;
/*
- * Flag for bypass if the IO is for read-ahead or background,
- * unless the read-ahead request is for metadata
+ * If the bio is for read-ahead or background IO, bypass it or
+ * not depends on the following situations,
+ * - If the IO is for meta data, always cache it and no bypass
+ * - If the IO is not meta data, check dc->cache_reada_policy,
+ * BCH_CACHE_READA_ALL: cache it and not bypass
+ * BCH_CACHE_READA_META_ONLY: not cache it and bypass
+ * That is, read-ahead request for metadata always get cached
* (eg, for gfs2 or xfs).
*/
- if (bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) &&
- !(bio->bi_opf & (REQ_META|REQ_PRIO)))
- goto skip;
+ if ((bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND))) {
+ if (!(bio->bi_opf & (REQ_META|REQ_PRIO)) &&
+ (dc->cache_readahead_policy != BCH_CACHE_READA_ALL))
+ goto skip;
+ }
if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) ||
bio_sectors(bio) & (c->sb.block_size - 1)) {
diff --git a/drivers/md/bcache/stats.c b/drivers/md/bcache/stats.c
index ba1c93791d8d..503aafe188dc 100644
--- a/drivers/md/bcache/stats.c
+++ b/drivers/md/bcache/stats.c
@@ -109,9 +109,13 @@ int bch_cache_accounting_add_kobjs(struct cache_accounting *acc,
void bch_cache_accounting_clear(struct cache_accounting *acc)
{
- memset(&acc->total.cache_hits,
- 0,
- sizeof(struct cache_stats));
+ acc->total.cache_hits = 0;
+ acc->total.cache_misses = 0;
+ acc->total.cache_bypass_hits = 0;
+ acc->total.cache_bypass_misses = 0;
+ acc->total.cache_readaheads = 0;
+ acc->total.cache_miss_collisions = 0;
+ acc->total.sectors_bypassed = 0;
}
void bch_cache_accounting_destroy(struct cache_accounting *acc)
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 6daf777105fb..5248bca5e2ed 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -527,12 +527,29 @@ static void prio_io(struct cache *ca, uint64_t bucket, int op,
closure_sync(cl);
}
-void bch_prio_write(struct cache *ca)
+int bch_prio_write(struct cache *ca, bool wait)
{
int i;
struct bucket *b;
struct closure cl;
+ pr_debug("free_prio=%zu, free_none=%zu, free_inc=%zu",
+ fifo_used(&ca->free[RESERVE_PRIO]),
+ fifo_used(&ca->free[RESERVE_NONE]),
+ fifo_used(&ca->free_inc));
+
+ /*
+ * Pre-check if there are enough free buckets. In the non-blocking
+ * scenario it's better to fail early rather than starting to allocate
+ * buckets and do a cleanup later in case of failure.
+ */
+ if (!wait) {
+ size_t avail = fifo_used(&ca->free[RESERVE_PRIO]) +
+ fifo_used(&ca->free[RESERVE_NONE]);
+ if (prio_buckets(ca) > avail)
+ return -ENOMEM;
+ }
+
closure_init_stack(&cl);
lockdep_assert_held(&ca->set->bucket_lock);
@@ -542,9 +559,6 @@ void bch_prio_write(struct cache *ca)
atomic_long_add(ca->sb.bucket_size * prio_buckets(ca),
&ca->meta_sectors_written);
- //pr_debug("free %zu, free_inc %zu, unused %zu", fifo_used(&ca->free),
- // fifo_used(&ca->free_inc), fifo_used(&ca->unused));
-
for (i = prio_buckets(ca) - 1; i >= 0; --i) {
long bucket;
struct prio_set *p = ca->disk_buckets;
@@ -562,7 +576,7 @@ void bch_prio_write(struct cache *ca)
p->magic = pset_magic(&ca->sb);
p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8);
- bucket = bch_bucket_alloc(ca, RESERVE_PRIO, true);
+ bucket = bch_bucket_alloc(ca, RESERVE_PRIO, wait);
BUG_ON(bucket == -1);
mutex_unlock(&ca->set->bucket_lock);
@@ -591,6 +605,7 @@ void bch_prio_write(struct cache *ca)
ca->prio_last_buckets[i] = ca->prio_buckets[i];
}
+ return 0;
}
static void prio_read(struct cache *ca, uint64_t bucket)
@@ -754,20 +769,31 @@ static inline int idx_to_first_minor(int idx)
static void bcache_device_free(struct bcache_device *d)
{
+ struct gendisk *disk = d->disk;
+
lockdep_assert_held(&bch_register_lock);
- pr_info("%s stopped", d->disk->disk_name);
+ if (disk)
+ pr_info("%s stopped", disk->disk_name);
+ else
+ pr_err("bcache device (NULL gendisk) stopped");
if (d->c)
bcache_device_detach(d);
- if (d->disk && d->disk->flags & GENHD_FL_UP)
- del_gendisk(d->disk);
- if (d->disk && d->disk->queue)
- blk_cleanup_queue(d->disk->queue);
- if (d->disk) {
+
+ if (disk) {
+ bool disk_added = (disk->flags & GENHD_FL_UP) != 0;
+
+ if (disk_added)
+ del_gendisk(disk);
+
+ if (disk->queue)
+ blk_cleanup_queue(disk->queue);
+
ida_simple_remove(&bcache_device_idx,
- first_minor_to_idx(d->disk->first_minor));
- put_disk(d->disk);
+ first_minor_to_idx(disk->first_minor));
+ if (disk_added)
+ put_disk(disk);
}
bioset_exit(&d->bio_split);
@@ -1209,6 +1235,9 @@ static void cached_dev_free(struct closure *cl)
mutex_unlock(&bch_register_lock);
+ if (dc->sb_bio.bi_inline_vecs[0].bv_page)
+ put_page(bio_first_page_all(&dc->sb_bio));
+
if (!IS_ERR_OR_NULL(dc->bdev))
blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
@@ -1674,7 +1703,7 @@ void bch_cache_set_unregister(struct cache_set *c)
}
#define alloc_bucket_pages(gfp, c) \
- ((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(c))))
+ ((void *) __get_free_pages(__GFP_ZERO|__GFP_COMP|gfp, ilog2(bucket_pages(c))))
struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
{
@@ -1886,7 +1915,7 @@ static int run_cache_set(struct cache_set *c)
mutex_lock(&c->bucket_lock);
for_each_cache(ca, c, i)
- bch_prio_write(ca);
+ bch_prio_write(ca, true);
mutex_unlock(&c->bucket_lock);
err = "cannot allocate new UUID bucket";
@@ -1994,7 +2023,14 @@ found:
sysfs_create_link(&c->kobj, &ca->kobj, buf))
goto err;
- if (ca->sb.seq > c->sb.seq) {
+ /*
+ * A special case is both ca->sb.seq and c->sb.seq are 0,
+ * such condition happens on a new created cache device whose
+ * super block is never flushed yet. In this case c->sb.version
+ * and other members should be updated too, otherwise we will
+ * have a mistaken super block version in cache set.
+ */
+ if (ca->sb.seq > c->sb.seq || c->sb.seq == 0) {
c->sb.version = ca->sb.version;
memcpy(c->sb.set_uuid, ca->sb.set_uuid, 16);
c->sb.flags = ca->sb.flags;
@@ -2274,29 +2310,35 @@ static bool bch_is_open(struct block_device *bdev)
static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
const char *buffer, size_t size)
{
- ssize_t ret = -EINVAL;
- const char *err = "cannot allocate memory";
+ const char *err;
char *path = NULL;
- struct cache_sb *sb = NULL;
+ struct cache_sb *sb;
struct block_device *bdev = NULL;
- struct page *sb_page = NULL;
+ struct page *sb_page;
+ ssize_t ret;
+ ret = -EBUSY;
+ err = "failed to reference bcache module";
if (!try_module_get(THIS_MODULE))
- return -EBUSY;
+ goto out;
/* For latest state of bcache_is_reboot */
smp_mb();
+ err = "bcache is in reboot";
if (bcache_is_reboot)
- return -EBUSY;
+ goto out_module_put;
+ ret = -ENOMEM;
+ err = "cannot allocate memory";
path = kstrndup(buffer, size, GFP_KERNEL);
if (!path)
- goto err;
+ goto out_module_put;
sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL);
if (!sb)
- goto err;
+ goto out_free_path;
+ ret = -EINVAL;
err = "failed to open device";
bdev = blkdev_get_by_path(strim(path),
FMODE_READ|FMODE_WRITE|FMODE_EXCL,
@@ -2313,57 +2355,69 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (!IS_ERR(bdev))
bdput(bdev);
if (attr == &ksysfs_register_quiet)
- goto quiet_out;
+ goto done;
}
- goto err;
+ goto out_free_sb;
}
err = "failed to set blocksize";
if (set_blocksize(bdev, 4096))
- goto err_close;
+ goto out_blkdev_put;
err = read_super(sb, bdev, &sb_page);
if (err)
- goto err_close;
+ goto out_blkdev_put;
err = "failed to register device";
if (SB_IS_BDEV(sb)) {
struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL);
if (!dc)
- goto err_close;
+ goto out_put_sb_page;
mutex_lock(&bch_register_lock);
ret = register_bdev(sb, sb_page, bdev, dc);
mutex_unlock(&bch_register_lock);
/* blkdev_put() will be called in cached_dev_free() */
- if (ret < 0)
- goto err;
+ if (ret < 0) {
+ bdev = NULL;
+ goto out_put_sb_page;
+ }
} else {
struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
if (!ca)
- goto err_close;
+ goto out_put_sb_page;
/* blkdev_put() will be called in bch_cache_release() */
- if (register_cache(sb, sb_page, bdev, ca) != 0)
- goto err;
+ if (register_cache(sb, sb_page, bdev, ca) != 0) {
+ bdev = NULL;
+ goto out_put_sb_page;
+ }
}
-quiet_out:
- ret = size;
-out:
- if (sb_page)
- put_page(sb_page);
+
+ put_page(sb_page);
+done:
+ kfree(sb);
+ kfree(path);
+ module_put(THIS_MODULE);
+ return size;
+
+out_put_sb_page:
+ put_page(sb_page);
+out_blkdev_put:
+ if (bdev)
+ blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+out_free_sb:
kfree(sb);
+out_free_path:
kfree(path);
+ path = NULL;
+out_module_put:
module_put(THIS_MODULE);
+out:
+ pr_info("error %s: %s", path?path:"", err);
return ret;
-
-err_close:
- blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
-err:
- pr_info("error %s: %s", path, err);
- goto out;
}
static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x)
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 54cd1727d20c..9d5cc9fc8d65 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -27,6 +27,12 @@ static const char * const bch_cache_modes[] = {
NULL
};
+static const char * const bch_reada_cache_policies[] = {
+ "all",
+ "meta-only",
+ NULL
+};
+
/* Default is 0 ("auto") */
static const char * const bch_stop_on_failure_modes[] = {
"auto",
@@ -100,6 +106,7 @@ rw_attribute(congested_write_threshold_us);
rw_attribute(sequential_cutoff);
rw_attribute(data_csum);
rw_attribute(cache_mode);
+rw_attribute(readahead_cache_policy);
rw_attribute(stop_when_cache_set_failed);
rw_attribute(writeback_metadata);
rw_attribute(writeback_running);
@@ -167,6 +174,11 @@ SHOW(__bch_cached_dev)
bch_cache_modes,
BDEV_CACHE_MODE(&dc->sb));
+ if (attr == &sysfs_readahead_cache_policy)
+ return bch_snprint_string_list(buf, PAGE_SIZE,
+ bch_reada_cache_policies,
+ dc->cache_readahead_policy);
+
if (attr == &sysfs_stop_when_cache_set_failed)
return bch_snprint_string_list(buf, PAGE_SIZE,
bch_stop_on_failure_modes,
@@ -349,6 +361,15 @@ STORE(__cached_dev)
}
}
+ if (attr == &sysfs_readahead_cache_policy) {
+ v = __sysfs_match_string(bch_reada_cache_policies, -1, buf);
+ if (v < 0)
+ return v;
+
+ if ((unsigned int) v != dc->cache_readahead_policy)
+ dc->cache_readahead_policy = v;
+ }
+
if (attr == &sysfs_stop_when_cache_set_failed) {
v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
if (v < 0)
@@ -463,6 +484,7 @@ static struct attribute *bch_cached_dev_files[] = {
&sysfs_data_csum,
#endif
&sysfs_cache_mode,
+ &sysfs_readahead_cache_policy,
&sysfs_stop_when_cache_set_failed,
&sysfs_writeback_metadata,
&sysfs_writeback_running,
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index e9ffcea1ca50..58bedd51e11b 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -516,15 +516,19 @@ void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned int inode,
uint64_t offset, int nr_sectors)
{
struct bcache_device *d = c->devices[inode];
- unsigned int stripe_offset, stripe, sectors_dirty;
+ unsigned int stripe_offset, sectors_dirty;
+ int stripe;
if (!d)
return;
+ stripe = offset_to_stripe(d, offset);
+ if (stripe < 0)
+ return;
+
if (UUID_FLASH_ONLY(&c->uuids[inode]))
atomic_long_add(nr_sectors, &c->flash_dev_dirty_sectors);
- stripe = offset_to_stripe(d, offset);
stripe_offset = offset & (d->stripe_size - 1);
while (nr_sectors) {
@@ -564,12 +568,12 @@ static bool dirty_pred(struct keybuf *buf, struct bkey *k)
static void refill_full_stripes(struct cached_dev *dc)
{
struct keybuf *buf = &dc->writeback_keys;
- unsigned int start_stripe, stripe, next_stripe;
+ unsigned int start_stripe, next_stripe;
+ int stripe;
bool wrapped = false;
stripe = offset_to_stripe(&dc->disk, KEY_OFFSET(&buf->last_scanned));
-
- if (stripe >= dc->disk.nr_stripes)
+ if (stripe < 0)
stripe = 0;
start_stripe = stripe;
diff --git a/drivers/md/bcache/writeback.h b/drivers/md/bcache/writeback.h
index 4e4c6810dc3c..c4ff76037227 100644
--- a/drivers/md/bcache/writeback.h
+++ b/drivers/md/bcache/writeback.h
@@ -33,10 +33,22 @@ static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
return ret;
}
-static inline unsigned int offset_to_stripe(struct bcache_device *d,
+static inline int offset_to_stripe(struct bcache_device *d,
uint64_t offset)
{
do_div(offset, d->stripe_size);
+
+ /* d->nr_stripes is in range [1, INT_MAX] */
+ if (unlikely(offset >= d->nr_stripes)) {
+ pr_err("Invalid stripe %llu (>= nr_stripes %d).\n",
+ offset, d->nr_stripes);
+ return -EINVAL;
+ }
+
+ /*
+ * Here offset is definitly smaller than INT_MAX,
+ * return it as int will never overflow.
+ */
return offset;
}
@@ -44,7 +56,10 @@ static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
uint64_t offset,
unsigned int nr_sectors)
{
- unsigned int stripe = offset_to_stripe(&dc->disk, offset);
+ int stripe = offset_to_stripe(&dc->disk, offset);
+
+ if (stripe < 0)
+ return false;
while (1) {
if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-04-27 22:44:51 +0000