Merge tag 'v3.4.108' into mm-6.0
Change-Id: I5ee718e5c87c9647c6edf0926a887679e065a649
Signed-off-by: José Adolfo Galdámez <josegalre@pac-rom.com>
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index ea5dd28..489d7fb 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -298,6 +298,18 @@
sector_t remaining = where->count;
struct request_queue *q = bdev_get_queue(where->bdev);
sector_t discard_sectors;
+ unsigned int uninitialized_var(special_cmd_max_sectors);
+
+ /*
+ * Reject unsupported discard and write same requests.
+ */
+ if (rw & REQ_DISCARD) {
+ special_cmd_max_sectors = q->limits.max_discard_sectors;
+ if (special_cmd_max_sectors == 0) {
+ dec_count(io, region, -EOPNOTSUPP);
+ return;
+ }
+ }
/*
* where->count may be zero if rw holds a flush and we need to
@@ -321,7 +333,7 @@
store_io_and_region_in_bio(bio, io, region);
if (rw & REQ_DISCARD) {
- discard_sectors = min_t(sector_t, q->limits.max_discard_sectors, remaining);
+ discard_sectors = min_t(sector_t, special_cmd_max_sectors, remaining);
bio->bi_size = discard_sectors << SECTOR_SHIFT;
remaining -= discard_sectors;
} else while (remaining) {
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index a3cf259..3afb9cd 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -603,6 +603,15 @@
return;
}
+ /*
+ * If the bio is discard, return an error, but do not
+ * degrade the array.
+ */
+ if (bio->bi_rw & REQ_DISCARD) {
+ bio_endio(bio, -EOPNOTSUPP);
+ return;
+ }
+
for (i = 0; i < ms->nr_mirrors; i++)
if (test_bit(i, &error))
fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR);
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index b092338..696a16b 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1444,8 +1444,6 @@
full_bio->bi_end_io = pe->full_bio_end_io;
full_bio->bi_private = pe->full_bio_private;
}
- free_pending_exception(pe);
-
increment_pending_exceptions_done_count();
up_write(&s->lock);
@@ -1462,6 +1460,8 @@
}
retry_origin_bios(s, origin_bios);
+
+ free_pending_exception(pe);
}
static void commit_callback(void *context, int success)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 0cf8c51..3bfbccc 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2232,7 +2232,7 @@
return 0;
}
-static struct mapped_device *dm_find_md(dev_t dev)
+struct mapped_device *dm_get_md(dev_t dev)
{
struct mapped_device *md;
unsigned minor = MINOR(dev);
@@ -2243,12 +2243,15 @@
spin_lock(&_minor_lock);
md = idr_find(&_minor_idr, minor);
- if (md && (md == MINOR_ALLOCED ||
- (MINOR(disk_devt(dm_disk(md))) != minor) ||
- dm_deleting_md(md) ||
- test_bit(DMF_FREEING, &md->flags))) {
- md = NULL;
- goto out;
+ if (md) {
+ if ((md == MINOR_ALLOCED ||
+ (MINOR(disk_devt(dm_disk(md))) != minor) ||
+ dm_deleting_md(md) ||
+ test_bit(DMF_FREEING, &md->flags))) {
+ md = NULL;
+ goto out;
+ }
+ dm_get(md);
}
out:
@@ -2256,16 +2259,6 @@
return md;
}
-
-struct mapped_device *dm_get_md(dev_t dev)
-{
- struct mapped_device *md = dm_find_md(dev);
-
- if (md)
- dm_get(md);
-
- return md;
-}
EXPORT_SYMBOL_GPL(dm_get_md);
void *dm_get_mdptr(struct mapped_device *md)
@@ -2302,10 +2295,16 @@
set_bit(DMF_FREEING, &md->flags);
spin_unlock(&_minor_lock);
+ /*
+ * Take suspend_lock so that presuspend and postsuspend methods
+ * do not race with internal suspend.
+ */
+ mutex_lock(&md->suspend_lock);
if (!dm_suspended_md(md)) {
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
+ mutex_unlock(&md->suspend_lock);
/*
* Rare, but there may be I/O requests still going to complete,