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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-14 15:32:19 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-14 15:32:19 -0800
commite2c5923c349c1738fe8fda980874d93f6fb2e5b6 (patch)
treeb97a90170c45211bcc437761653aa8016c34afcd /block/genhd.c
parentabc36be236358162202e86ad88616ff95a755101 (diff)
parenta04b5de5050ab8b891128eb2c47a0916fe8622e1 (diff)
downloadlinux-0-day-e2c5923c349c1738fe8fda980874d93f6fb2e5b6.tar.gz
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
Pull core block layer updates from Jens Axboe: "This is the main pull request for block storage for 4.15-rc1. Nothing out of the ordinary in here, and no API changes or anything like that. Just various new features for drivers, core changes, etc. In particular, this pull request contains: - A patch series from Bart, closing the whole on blk/scsi-mq queue quescing. - A series from Christoph, building towards hidden gendisks (for multipath) and ability to move bio chains around. - NVMe - Support for native multipath for NVMe (Christoph). - Userspace notifications for AENs (Keith). - Command side-effects support (Keith). - SGL support (Chaitanya Kulkarni) - FC fixes and improvements (James Smart) - Lots of fixes and tweaks (Various) - bcache - New maintainer (Michael Lyle) - Writeback control improvements (Michael) - Various fixes (Coly, Elena, Eric, Liang, et al) - lightnvm updates, mostly centered around the pblk interface (Javier, Hans, and Rakesh). - Removal of unused bio/bvec kmap atomic interfaces (me, Christoph) - Writeback series that fix the much discussed hundreds of millions of sync-all units. This goes all the way, as discussed previously (me). - Fix for missing wakeup on writeback timer adjustments (Yafang Shao). - Fix laptop mode on blk-mq (me). - {mq,name} tupple lookup for IO schedulers, allowing us to have alias names. This means you can use 'deadline' on both !mq and on mq (where it's called mq-deadline). (me). - blktrace race fix, oopsing on sg load (me). - blk-mq optimizations (me). - Obscure waitqueue race fix for kyber (Omar). - NBD fixes (Josef). - Disable writeback throttling by default on bfq, like we do on cfq (Luca Miccio). - Series from Ming that enable us to treat flush requests on blk-mq like any other request. This is a really nice cleanup. - Series from Ming that improves merging on blk-mq with schedulers, getting us closer to flipping the switch on scsi-mq again. - BFQ updates (Paolo). - blk-mq atomic flags memory ordering fixes (Peter Z). - Loop cgroup support (Shaohua). - Lots of minor fixes from lots of different folks, both for core and driver code" * 'for-4.15/block' of git://git.kernel.dk/linux-block: (294 commits) nvme: fix visibility of "uuid" ns attribute blk-mq: fixup some comment typos and lengths ide: ide-atapi: fix compile error with defining macro DEBUG blk-mq: improve tag waiting setup for non-shared tags brd: remove unused brd_mutex blk-mq: only run the hardware queue if IO is pending block: avoid null pointer dereference on null disk fs: guard_bio_eod() needs to consider partitions xtensa/simdisk: fix compile error nvme: expose subsys attribute to sysfs nvme: create 'slaves' and 'holders' entries for hidden controllers block: create 'slaves' and 'holders' entries for hidden gendisks nvme: also expose the namespace identification sysfs files for mpath nodes nvme: implement multipath access to nvme subsystems nvme: track shared namespaces nvme: introduce a nvme_ns_ids structure nvme: track subsystems block, nvme: Introduce blk_mq_req_flags_t block, scsi: Make SCSI quiesce and resume work reliably block: Add the QUEUE_FLAG_PREEMPT_ONLY request queue flag ...
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c70
1 files changed, 49 insertions, 21 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 630c0da..c2223f1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -588,6 +588,11 @@ static void register_disk(struct device *parent, struct gendisk *disk)
disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
+ if (disk->flags & GENHD_FL_HIDDEN) {
+ dev_set_uevent_suppress(ddev, 0);
+ return;
+ }
+
/* No minors to use for partitions */
if (!disk_part_scan_enabled(disk))
goto exit;
@@ -616,6 +621,11 @@ exit:
while ((part = disk_part_iter_next(&piter)))
kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
disk_part_iter_exit(&piter);
+
+ err = sysfs_create_link(&ddev->kobj,
+ &disk->queue->backing_dev_info->dev->kobj,
+ "bdi");
+ WARN_ON(err);
}
/**
@@ -630,7 +640,6 @@ exit:
*/
void device_add_disk(struct device *parent, struct gendisk *disk)
{
- struct backing_dev_info *bdi;
dev_t devt;
int retval;
@@ -639,7 +648,8 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
* parameters make sense.
*/
WARN_ON(disk->minors && !(disk->major || disk->first_minor));
- WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT));
+ WARN_ON(!disk->minors &&
+ !(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN)));
disk->flags |= GENHD_FL_UP;
@@ -648,22 +658,26 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
WARN_ON(1);
return;
}
- disk_to_dev(disk)->devt = devt;
-
- /* ->major and ->first_minor aren't supposed to be
- * dereferenced from here on, but set them just in case.
- */
disk->major = MAJOR(devt);
disk->first_minor = MINOR(devt);
disk_alloc_events(disk);
- /* Register BDI before referencing it from bdev */
- bdi = disk->queue->backing_dev_info;
- bdi_register_owner(bdi, disk_to_dev(disk));
-
- blk_register_region(disk_devt(disk), disk->minors, NULL,
- exact_match, exact_lock, disk);
+ if (disk->flags & GENHD_FL_HIDDEN) {
+ /*
+ * Don't let hidden disks show up in /proc/partitions,
+ * and don't bother scanning for partitions either.
+ */
+ disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO;
+ disk->flags |= GENHD_FL_NO_PART_SCAN;
+ } else {
+ /* Register BDI before referencing it from bdev */
+ disk_to_dev(disk)->devt = devt;
+ bdi_register_owner(disk->queue->backing_dev_info,
+ disk_to_dev(disk));
+ blk_register_region(disk_devt(disk), disk->minors, NULL,
+ exact_match, exact_lock, disk);
+ }
register_disk(parent, disk);
blk_register_queue(disk);
@@ -673,10 +687,6 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
*/
WARN_ON_ONCE(!blk_get_queue(disk->queue));
- retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
- "bdi");
- WARN_ON(retval);
-
disk_add_events(disk);
blk_integrity_add(disk);
}
@@ -705,7 +715,8 @@ void del_gendisk(struct gendisk *disk)
set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
- sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
+ if (!(disk->flags & GENHD_FL_HIDDEN))
+ sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
if (disk->queue) {
/*
* Unregister bdi before releasing device numbers (as they can
@@ -716,13 +727,15 @@ void del_gendisk(struct gendisk *disk)
} else {
WARN_ON(1);
}
- blk_unregister_region(disk_devt(disk), disk->minors);
- part_stat_set_all(&disk->part0, 0);
- disk->part0.stamp = 0;
+ if (!(disk->flags & GENHD_FL_HIDDEN))
+ blk_unregister_region(disk_devt(disk), disk->minors);
kobject_put(disk->part0.holder_dir);
kobject_put(disk->slave_dir);
+
+ part_stat_set_all(&disk->part0, 0);
+ disk->part0.stamp = 0;
if (!sysfs_deprecated)
sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
pm_runtime_set_memalloc_noio(disk_to_dev(disk), false);
@@ -785,6 +798,10 @@ struct gendisk *get_gendisk(dev_t devt, int *partno)
spin_unlock_bh(&ext_devt_lock);
}
+ if (disk && unlikely(disk->flags & GENHD_FL_HIDDEN)) {
+ put_disk(disk);
+ disk = NULL;
+ }
return disk;
}
EXPORT_SYMBOL(get_gendisk);
@@ -1028,6 +1045,15 @@ static ssize_t disk_removable_show(struct device *dev,
(disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
}
+static ssize_t disk_hidden_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+
+ return sprintf(buf, "%d\n",
+ (disk->flags & GENHD_FL_HIDDEN ? 1 : 0));
+}
+
static ssize_t disk_ro_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -1065,6 +1091,7 @@ static ssize_t disk_discard_alignment_show(struct device *dev,
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL);
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL);
+static DEVICE_ATTR(hidden, S_IRUGO, disk_hidden_show, NULL);
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL);
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL);
@@ -1089,6 +1116,7 @@ static struct attribute *disk_attrs[] = {
&dev_attr_range.attr,
&dev_attr_ext_range.attr,
&dev_attr_removable.attr,
+ &dev_attr_hidden.attr,
&dev_attr_ro.attr,
&dev_attr_size.attr,
&dev_attr_alignment_offset.attr,