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-rw-r--r--fs/partitions/check.c130
1 files changed, 36 insertions, 94 deletions
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 79fbf3f390f0..9c21119512b9 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -237,6 +237,13 @@ ssize_t part_size_show(struct device *dev,
return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
}
+ssize_t part_ro_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct hd_struct *p = dev_to_part(dev);
+ return sprintf(buf, "%d\n", p->policy ? 1 : 0);
+}
+
ssize_t part_alignment_offset_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -312,6 +319,7 @@ ssize_t part_fail_store(struct device *dev,
static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
+static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
NULL);
@@ -326,6 +334,7 @@ static struct attribute *part_attrs[] = {
&dev_attr_partition.attr,
&dev_attr_start.attr,
&dev_attr_size.attr,
+ &dev_attr_ro.attr,
&dev_attr_alignment_offset.attr,
&dev_attr_discard_alignment.attr,
&dev_attr_stat.attr,
@@ -352,6 +361,7 @@ static void part_release(struct device *dev)
{
struct hd_struct *p = dev_to_part(dev);
free_part_stats(p);
+ free_part_info(p);
kfree(p);
}
@@ -371,6 +381,11 @@ static void delete_partition_rcu_cb(struct rcu_head *head)
put_device(part_to_dev(part));
}
+void __delete_partition(struct hd_struct *part)
+{
+ call_rcu(&part->rcu_head, delete_partition_rcu_cb);
+}
+
void delete_partition(struct gendisk *disk, int partno)
{
struct disk_part_tbl *ptbl = disk->part_tbl;
@@ -389,7 +404,7 @@ void delete_partition(struct gendisk *disk, int partno)
kobject_put(part->holder_dir);
device_del(part_to_dev(part));
- call_rcu(&part->rcu_head, delete_partition_rcu_cb);
+ hd_struct_put(part);
}
static ssize_t whole_disk_show(struct device *dev,
@@ -401,7 +416,8 @@ static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
whole_disk_show, NULL);
struct hd_struct *add_partition(struct gendisk *disk, int partno,
- sector_t start, sector_t len, int flags)
+ sector_t start, sector_t len, int flags,
+ struct partition_meta_info *info)
{
struct hd_struct *p;
dev_t devt = MKDEV(0, 0);
@@ -438,6 +454,14 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
p->partno = partno;
p->policy = get_disk_ro(disk);
+ if (info) {
+ struct partition_meta_info *pinfo = alloc_part_info(disk);
+ if (!pinfo)
+ goto out_free_stats;
+ memcpy(pinfo, info, sizeof(*info));
+ p->info = pinfo;
+ }
+
dname = dev_name(ddev);
if (isdigit(dname[strlen(dname) - 1]))
dev_set_name(pdev, "%sp%d", dname, partno);
@@ -451,7 +475,7 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
err = blk_alloc_devt(p, &devt);
if (err)
- goto out_free_stats;
+ goto out_free_info;
pdev->devt = devt;
/* delay uevent until 'holders' subdir is created */
@@ -479,8 +503,11 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
if (!dev_get_uevent_suppress(ddev))
kobject_uevent(&pdev->kobj, KOBJ_ADD);
+ hd_ref_init(p);
return p;
+out_free_info:
+ free_part_info(p);
out_free_stats:
free_part_stats(p);
out_free:
@@ -495,65 +522,6 @@ out_put:
return ERR_PTR(err);
}
-/* Not exported, helper to add_disk(). */
-void register_disk(struct gendisk *disk)
-{
- struct device *ddev = disk_to_dev(disk);
- struct block_device *bdev;
- struct disk_part_iter piter;
- struct hd_struct *part;
- int err;
-
- ddev->parent = disk->driverfs_dev;
-
- dev_set_name(ddev, disk->disk_name);
-
- /* delay uevents, until we scanned partition table */
- dev_set_uevent_suppress(ddev, 1);
-
- if (device_add(ddev))
- return;
-#ifndef CONFIG_SYSFS_DEPRECATED
- err = sysfs_create_link(block_depr, &ddev->kobj,
- kobject_name(&ddev->kobj));
- if (err) {
- device_del(ddev);
- return;
- }
-#endif
- disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
- disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
-
- /* No minors to use for partitions */
- if (!disk_partitionable(disk))
- goto exit;
-
- /* No such device (e.g., media were just removed) */
- if (!get_capacity(disk))
- goto exit;
-
- bdev = bdget_disk(disk, 0);
- if (!bdev)
- goto exit;
-
- bdev->bd_invalidated = 1;
- err = blkdev_get(bdev, FMODE_READ);
- if (err < 0)
- goto exit;
- blkdev_put(bdev, FMODE_READ);
-
-exit:
- /* announce disk after possible partitions are created */
- dev_set_uevent_suppress(ddev, 0);
- kobject_uevent(&ddev->kobj, KOBJ_ADD);
-
- /* announce possible partitions */
- disk_part_iter_init(&piter, disk, 0);
- while ((part = disk_part_iter_next(&piter)))
- kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
- disk_part_iter_exit(&piter);
-}
-
static bool disk_unlock_native_capacity(struct gendisk *disk)
{
const struct block_device_operations *bdops = disk->fops;
@@ -642,6 +610,7 @@ rescan:
/* add partitions */
for (p = 1; p < state->limit; p++) {
sector_t size, from;
+ struct partition_meta_info *info = NULL;
size = state->parts[p].size;
if (!size)
@@ -675,8 +644,12 @@ rescan:
size = get_capacity(disk) - from;
}
}
+
+ if (state->parts[p].has_info)
+ info = &state->parts[p].info;
part = add_partition(disk, p, from, size,
- state->parts[p].flags);
+ state->parts[p].flags,
+ &state->parts[p].info);
if (IS_ERR(part)) {
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
disk->disk_name, p, -PTR_ERR(part));
@@ -711,34 +684,3 @@ fail:
}
EXPORT_SYMBOL(read_dev_sector);
-
-void del_gendisk(struct gendisk *disk)
-{
- struct disk_part_iter piter;
- struct hd_struct *part;
-
- /* invalidate stuff */
- disk_part_iter_init(&piter, disk,
- DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
- while ((part = disk_part_iter_next(&piter))) {
- invalidate_partition(disk, part->partno);
- delete_partition(disk, part->partno);
- }
- disk_part_iter_exit(&piter);
-
- invalidate_partition(disk, 0);
- blk_free_devt(disk_to_dev(disk)->devt);
- set_capacity(disk, 0);
- disk->flags &= ~GENHD_FL_UP;
- unlink_gendisk(disk);
- part_stat_set_all(&disk->part0, 0);
- disk->part0.stamp = 0;
-
- kobject_put(disk->part0.holder_dir);
- kobject_put(disk->slave_dir);
- disk->driverfs_dev = NULL;
-#ifndef CONFIG_SYSFS_DEPRECATED
- sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
-#endif
- device_del(disk_to_dev(disk));
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.