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-rw-r--r--drivers/block/drbd/drbd_receiver.c4
-rw-r--r--drivers/block/virtio_blk.c110
-rw-r--r--drivers/block/zram/zram_drv.c64
-rw-r--r--drivers/block/zram/zram_drv.h15
4 files changed, 128 insertions, 65 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index c897c4572036..ee69d50ba4fd 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -781,7 +781,7 @@ static struct socket *drbd_wait_for_connect(struct drbd_connection *connection,
timeo = connect_int * HZ;
/* 28.5% random jitter */
- timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7;
+ timeo += prandom_u32_max(2) ? timeo / 7 : -timeo / 7;
err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo);
if (err <= 0)
@@ -1004,7 +1004,7 @@ retry:
drbd_warn(connection, "Error receiving initial packet\n");
sock_release(s);
randomize:
- if (prandom_u32() & 1)
+ if (prandom_u32_max(2))
goto retry;
}
}
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 3f4739d52268..19da5defd734 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -130,7 +130,7 @@ static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr)
return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
}
-static int virtblk_setup_discard_write_zeroes(struct request *req, bool unmap)
+static int virtblk_setup_discard_write_zeroes_erase(struct request *req, bool unmap)
{
unsigned short segments = blk_rq_nr_discard_segments(req);
unsigned short n = 0;
@@ -240,6 +240,9 @@ static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev,
type = VIRTIO_BLK_T_WRITE_ZEROES;
unmap = !(req->cmd_flags & REQ_NOUNMAP);
break;
+ case REQ_OP_SECURE_ERASE:
+ type = VIRTIO_BLK_T_SECURE_ERASE;
+ break;
case REQ_OP_DRV_IN:
type = VIRTIO_BLK_T_GET_ID;
break;
@@ -251,8 +254,9 @@ static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev,
vbr->out_hdr.type = cpu_to_virtio32(vdev, type);
vbr->out_hdr.ioprio = cpu_to_virtio32(vdev, req_get_ioprio(req));
- if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES) {
- if (virtblk_setup_discard_write_zeroes(req, unmap))
+ if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES ||
+ type == VIRTIO_BLK_T_SECURE_ERASE) {
+ if (virtblk_setup_discard_write_zeroes_erase(req, unmap))
return BLK_STS_RESOURCE;
}
@@ -886,6 +890,8 @@ static int virtblk_probe(struct virtio_device *vdev)
int err, index;
u32 v, blk_size, max_size, sg_elems, opt_io_size;
+ u32 max_discard_segs = 0;
+ u32 discard_granularity = 0;
u16 min_io_size;
u8 physical_block_exp, alignment_offset;
unsigned int queue_depth;
@@ -1043,27 +1049,14 @@ static int virtblk_probe(struct virtio_device *vdev)
if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) {
virtio_cread(vdev, struct virtio_blk_config,
- discard_sector_alignment, &v);
- if (v)
- q->limits.discard_granularity = v << SECTOR_SHIFT;
- else
- q->limits.discard_granularity = blk_size;
+ discard_sector_alignment, &discard_granularity);
virtio_cread(vdev, struct virtio_blk_config,
max_discard_sectors, &v);
blk_queue_max_discard_sectors(q, v ? v : UINT_MAX);
virtio_cread(vdev, struct virtio_blk_config, max_discard_seg,
- &v);
-
- /*
- * max_discard_seg == 0 is out of spec but we always
- * handled it.
- */
- if (!v)
- v = sg_elems;
- blk_queue_max_discard_segments(q,
- min(v, MAX_DISCARD_SEGMENTS));
+ &max_discard_segs);
}
if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) {
@@ -1072,6 +1065,85 @@ static int virtblk_probe(struct virtio_device *vdev)
blk_queue_max_write_zeroes_sectors(q, v ? v : UINT_MAX);
}
+ /* The discard and secure erase limits are combined since the Linux
+ * block layer uses the same limit for both commands.
+ *
+ * If both VIRTIO_BLK_F_SECURE_ERASE and VIRTIO_BLK_F_DISCARD features
+ * are negotiated, we will use the minimum between the limits.
+ *
+ * discard sector alignment is set to the minimum between discard_sector_alignment
+ * and secure_erase_sector_alignment.
+ *
+ * max discard sectors is set to the minimum between max_discard_seg and
+ * max_secure_erase_seg.
+ */
+ if (virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) {
+
+ virtio_cread(vdev, struct virtio_blk_config,
+ secure_erase_sector_alignment, &v);
+
+ /* secure_erase_sector_alignment should not be zero, the device should set a
+ * valid number of sectors.
+ */
+ if (!v) {
+ dev_err(&vdev->dev,
+ "virtio_blk: secure_erase_sector_alignment can't be 0\n");
+ err = -EINVAL;
+ goto out_cleanup_disk;
+ }
+
+ discard_granularity = min_not_zero(discard_granularity, v);
+
+ virtio_cread(vdev, struct virtio_blk_config,
+ max_secure_erase_sectors, &v);
+
+ /* max_secure_erase_sectors should not be zero, the device should set a
+ * valid number of sectors.
+ */
+ if (!v) {
+ dev_err(&vdev->dev,
+ "virtio_blk: max_secure_erase_sectors can't be 0\n");
+ err = -EINVAL;
+ goto out_cleanup_disk;
+ }
+
+ blk_queue_max_secure_erase_sectors(q, v);
+
+ virtio_cread(vdev, struct virtio_blk_config,
+ max_secure_erase_seg, &v);
+
+ /* max_secure_erase_seg should not be zero, the device should set a
+ * valid number of segments
+ */
+ if (!v) {
+ dev_err(&vdev->dev,
+ "virtio_blk: max_secure_erase_seg can't be 0\n");
+ err = -EINVAL;
+ goto out_cleanup_disk;
+ }
+
+ max_discard_segs = min_not_zero(max_discard_segs, v);
+ }
+
+ if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD) ||
+ virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) {
+ /* max_discard_seg and discard_granularity will be 0 only
+ * if max_discard_seg and discard_sector_alignment fields in the virtio
+ * config are 0 and VIRTIO_BLK_F_SECURE_ERASE feature is not negotiated.
+ * In this case, we use default values.
+ */
+ if (!max_discard_segs)
+ max_discard_segs = sg_elems;
+
+ blk_queue_max_discard_segments(q,
+ min(max_discard_segs, MAX_DISCARD_SEGMENTS));
+
+ if (discard_granularity)
+ q->limits.discard_granularity = discard_granularity << SECTOR_SHIFT;
+ else
+ q->limits.discard_granularity = blk_size;
+ }
+
virtblk_update_capacity(vblk, false);
virtio_device_ready(vdev);
@@ -1167,6 +1239,7 @@ static unsigned int features_legacy[] = {
VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
+ VIRTIO_BLK_F_SECURE_ERASE,
}
;
static unsigned int features[] = {
@@ -1174,6 +1247,7 @@ static unsigned int features[] = {
VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
+ VIRTIO_BLK_F_SECURE_ERASE,
};
static struct virtio_driver virtio_blk = {
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index e551433cd107..966aab902d19 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -52,9 +52,6 @@ static unsigned int num_devices = 1;
static size_t huge_class_size;
static const struct block_device_operations zram_devops;
-#ifdef CONFIG_ZRAM_WRITEBACK
-static const struct block_device_operations zram_wb_devops;
-#endif
static void zram_free_page(struct zram *zram, size_t index);
static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
@@ -329,8 +326,8 @@ static ssize_t idle_store(struct device *dev,
if (!sysfs_streq(buf, "all")) {
/*
- * If it did not parse as 'all' try to treat it as an integer when
- * we have memory tracking enabled.
+ * If it did not parse as 'all' try to treat it as an integer
+ * when we have memory tracking enabled.
*/
u64 age_sec;
@@ -345,7 +342,10 @@ static ssize_t idle_store(struct device *dev,
if (!init_done(zram))
goto out_unlock;
- /* A cutoff_time of 0 marks everything as idle, this is the "all" behavior */
+ /*
+ * A cutoff_time of 0 marks everything as idle, this is the
+ * "all" behavior.
+ */
mark_idle(zram, cutoff_time);
rv = len;
@@ -543,17 +543,6 @@ static ssize_t backing_dev_store(struct device *dev,
zram->backing_dev = backing_dev;
zram->bitmap = bitmap;
zram->nr_pages = nr_pages;
- /*
- * With writeback feature, zram does asynchronous IO so it's no longer
- * synchronous device so let's remove synchronous io flag. Othewise,
- * upper layer(e.g., swap) could wait IO completion rather than
- * (submit and return), which will cause system sluggish.
- * Furthermore, when the IO function returns(e.g., swap_readpage),
- * upper layer expects IO was done so it could deallocate the page
- * freely but in fact, IO is going on so finally could cause
- * use-after-free when the IO is really done.
- */
- zram->disk->fops = &zram_wb_devops;
up_write(&zram->init_lock);
pr_info("setup backing device %s\n", file_name);
@@ -1267,6 +1256,9 @@ static int __zram_bvec_read(struct zram *zram, struct page *page, u32 index,
struct bio_vec bvec;
zram_slot_unlock(zram, index);
+ /* A null bio means rw_page was used, we must fallback to bio */
+ if (!bio)
+ return -EOPNOTSUPP;
bvec.bv_page = page;
bvec.bv_len = PAGE_SIZE;
@@ -1410,9 +1402,19 @@ compress_again:
handle = zs_malloc(zram->mem_pool, comp_len,
GFP_NOIO | __GFP_HIGHMEM |
__GFP_MOVABLE);
- if (!IS_ERR((void *)handle))
+ if (IS_ERR((void *)handle))
+ return PTR_ERR((void *)handle);
+
+ if (comp_len != PAGE_SIZE)
goto compress_again;
- return PTR_ERR((void *)handle);
+ /*
+ * If the page is not compressible, you need to acquire the
+ * lock and execute the code below. The zcomp_stream_get()
+ * call is needed to disable the cpu hotplug and grab the
+ * zstrm buffer back. It is necessary that the dereferencing
+ * of the zstrm variable below occurs correctly.
+ */
+ zstrm = zcomp_stream_get(zram->comp);
}
alloced_pages = zs_get_total_pages(zram->mem_pool);
@@ -1710,9 +1712,6 @@ out:
static void zram_reset_device(struct zram *zram)
{
- struct zcomp *comp;
- u64 disksize;
-
down_write(&zram->init_lock);
zram->limit_pages = 0;
@@ -1722,17 +1721,15 @@ static void zram_reset_device(struct zram *zram)
return;
}
- comp = zram->comp;
- disksize = zram->disksize;
- zram->disksize = 0;
-
set_capacity_and_notify(zram->disk, 0);
part_stat_set_all(zram->disk->part0, 0);
/* I/O operation under all of CPU are done so let's free */
- zram_meta_free(zram, disksize);
+ zram_meta_free(zram, zram->disksize);
+ zram->disksize = 0;
memset(&zram->stats, 0, sizeof(zram->stats));
- zcomp_destroy(comp);
+ zcomp_destroy(zram->comp);
+ zram->comp = NULL;
reset_bdev(zram);
up_write(&zram->init_lock);
@@ -1848,15 +1845,6 @@ static const struct block_device_operations zram_devops = {
.owner = THIS_MODULE
};
-#ifdef CONFIG_ZRAM_WRITEBACK
-static const struct block_device_operations zram_wb_devops = {
- .open = zram_open,
- .submit_bio = zram_submit_bio,
- .swap_slot_free_notify = zram_slot_free_notify,
- .owner = THIS_MODULE
-};
-#endif
-
static DEVICE_ATTR_WO(compact);
static DEVICE_ATTR_RW(disksize);
static DEVICE_ATTR_RO(initstate);
@@ -2126,6 +2114,8 @@ static int __init zram_init(void)
{
int ret;
+ BUILD_BUG_ON(__NR_ZRAM_PAGEFLAGS > BITS_PER_LONG);
+
ret = cpuhp_setup_state_multi(CPUHP_ZCOMP_PREPARE, "block/zram:prepare",
zcomp_cpu_up_prepare, zcomp_cpu_dead);
if (ret < 0)
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 80c3b43b4828..a2bda53020fd 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -30,16 +30,15 @@
/*
- * The lower ZRAM_FLAG_SHIFT bits of table.flags is for
- * object size (excluding header), the higher bits is for
- * zram_pageflags.
+ * ZRAM is mainly used for memory efficiency so we want to keep memory
+ * footprint small and thus squeeze size and zram pageflags into a flags
+ * member. The lower ZRAM_FLAG_SHIFT bits is for object size (excluding
+ * header), which cannot be larger than PAGE_SIZE (requiring PAGE_SHIFT
+ * bits), the higher bits are for zram_pageflags.
*
- * zram is mainly used for memory efficiency so we want to keep memory
- * footprint small so we can squeeze size and flags into a field.
- * The lower ZRAM_FLAG_SHIFT bits is for object size (excluding header),
- * the higher bits is for zram_pageflags.
+ * We use BUILD_BUG_ON() to make sure that zram pageflags don't overflow.
*/
-#define ZRAM_FLAG_SHIFT 24
+#define ZRAM_FLAG_SHIFT (PAGE_SHIFT + 1)
/* Flags for zram pages (table[page_no].flags) */
enum zram_pageflags {
generated by cgit v1.2.3 (git 2.39.0) at 2025-03-07 08:35:01 +0300