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-rw-r--r--block/genhd.c252
1 files changed, 97 insertions, 155 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 9eb8b3e212c1..8b9a9ff1a842 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -226,117 +226,114 @@ struct gendisk *get_gendisk(dev_t devt, int *part)
}
/*
- * print a partitions - intended for places where the root filesystem can't be
- * mounted and thus to give the victim some idea of what went wrong
- */
-static int printk_partition(struct device *dev, void *data)
-{
- struct gendisk *sgp;
- char buf[BDEVNAME_SIZE];
- int n;
-
- if (dev->type != &disk_type)
- return 0;
-
- sgp = dev_to_disk(dev);
- /*
- * Don't show empty devices or things that have been surpressed
- */
- if (get_capacity(sgp) == 0 ||
- (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
- return 0;
-
- /*
- * Note, unlike /proc/partitions, I am showing the numbers in
- * hex - the same format as the root= option takes.
- */
- printk("%02x%02x %10llu %s",
- sgp->major, sgp->first_minor,
- (unsigned long long)get_capacity(sgp) >> 1,
- disk_name(sgp, 0, buf));
- if (sgp->driverfs_dev != NULL &&
- sgp->driverfs_dev->driver != NULL)
- printk(" driver: %s\n",
- sgp->driverfs_dev->driver->name);
- else
- printk(" (driver?)\n");
-
- /* now show the partitions */
- for (n = 0; n < sgp->minors - 1; ++n) {
- if (sgp->part[n] == NULL)
- continue;
- if (sgp->part[n]->nr_sects == 0)
- continue;
- printk(" %02x%02x %10llu %s\n",
- sgp->major, n + 1 + sgp->first_minor,
- (unsigned long long)sgp->part[n]->nr_sects >> 1,
- disk_name(sgp, n + 1, buf));
- }
-
- return 0;
-}
-
-/*
* print a full list of all partitions - intended for places where the root
* filesystem can't be mounted and thus to give the victim some idea of what
* went wrong
*/
void __init printk_all_partitions(void)
{
- class_for_each_device(&block_class, NULL, NULL, printk_partition);
+ struct class_dev_iter iter;
+ struct device *dev;
+
+ class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
+ while ((dev = class_dev_iter_next(&iter))) {
+ struct gendisk *disk = dev_to_disk(dev);
+ char buf[BDEVNAME_SIZE];
+ int n;
+
+ /*
+ * Don't show empty devices or things that have been
+ * surpressed
+ */
+ if (get_capacity(disk) == 0 ||
+ (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
+ continue;
+
+ /*
+ * Note, unlike /proc/partitions, I am showing the
+ * numbers in hex - the same format as the root=
+ * option takes.
+ */
+ printk("%02x%02x %10llu %s",
+ disk->major, disk->first_minor,
+ (unsigned long long)get_capacity(disk) >> 1,
+ disk_name(disk, 0, buf));
+ if (disk->driverfs_dev != NULL &&
+ disk->driverfs_dev->driver != NULL)
+ printk(" driver: %s\n",
+ disk->driverfs_dev->driver->name);
+ else
+ printk(" (driver?)\n");
+
+ /* now show the partitions */
+ for (n = 0; n < disk->minors - 1; ++n) {
+ if (disk->part[n] == NULL)
+ continue;
+ if (disk->part[n]->nr_sects == 0)
+ continue;
+ printk(" %02x%02x %10llu %s\n",
+ disk->major, n + 1 + disk->first_minor,
+ (unsigned long long)disk->part[n]->nr_sects >> 1,
+ disk_name(disk, n + 1, buf));
+ }
+ }
+ class_dev_iter_exit(&iter);
}
#ifdef CONFIG_PROC_FS
/* iterator */
-static int find_start(struct device *dev, void *data)
+static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos)
{
- loff_t *k = data;
+ loff_t skip = *pos;
+ struct class_dev_iter *iter;
+ struct device *dev;
- if (dev->type != &disk_type)
- return 0;
- if (!*k)
- return 1;
- (*k)--;
- return 0;
+ iter = kmalloc(GFP_KERNEL, sizeof(*iter));
+ if (!iter)
+ return ERR_PTR(-ENOMEM);
+
+ seqf->private = iter;
+ class_dev_iter_init(iter, &block_class, NULL, &disk_type);
+ do {
+ dev = class_dev_iter_next(iter);
+ if (!dev)
+ return NULL;
+ } while (skip--);
+
+ return dev_to_disk(dev);
}
-static void *part_start(struct seq_file *part, loff_t *pos)
+static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos)
{
struct device *dev;
- loff_t n = *pos;
-
- if (!n)
- part->private = (void *)1LU; /* tell show to print header */
- dev = class_find_device(&block_class, NULL, &n, find_start);
+ (*pos)++;
+ dev = class_dev_iter_next(seqf->private);
if (dev)
return dev_to_disk(dev);
return NULL;
}
-static int find_next(struct device *dev, void *data)
+static void disk_seqf_stop(struct seq_file *seqf, void *v)
{
- if (dev->type == &disk_type)
- return 1;
- return 0;
-}
+ struct class_dev_iter *iter = seqf->private;
-static void *part_next(struct seq_file *part, void *v, loff_t *pos)
-{
- struct gendisk *gp = v;
- struct device *dev;
- ++*pos;
- dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
- if (dev) {
- put_device(dev);
- return dev_to_disk(dev);
+ /* stop is called even after start failed :-( */
+ if (iter) {
+ class_dev_iter_exit(iter);
+ kfree(iter);
}
- return NULL;
}
-static void part_stop(struct seq_file *part, void *v)
+static void *show_partition_start(struct seq_file *seqf, loff_t *pos)
{
+ static void *p;
+
+ p = disk_seqf_start(seqf, pos);
+ if (!IS_ERR(p) && p)
+ seq_puts(seqf, "major minor #blocks name\n\n");
+ return p;
}
static int show_partition(struct seq_file *part, void *v)
@@ -383,9 +380,9 @@ static int show_partition(struct seq_file *part, void *v)
}
const struct seq_operations partitions_op = {
- .start = part_start,
- .next = part_next,
- .stop = part_stop,
+ .start = show_partition_start,
+ .next = disk_seqf_next,
+ .stop = disk_seqf_stop,
.show = show_partition
};
#endif
@@ -567,44 +564,6 @@ static struct device_type disk_type = {
};
#ifdef CONFIG_PROC_FS
-/*
- * aggregate disk stat collector. Uses the same stats that the sysfs
- * entries do, above, but makes them available through one seq_file.
- *
- * The output looks suspiciously like /proc/partitions with a bunch of
- * extra fields.
- */
-
-static void *diskstats_start(struct seq_file *part, loff_t *pos)
-{
- struct device *dev;
- loff_t n = *pos;
-
- dev = class_find_device(&block_class, NULL, &n, find_start);
- if (dev)
- return dev_to_disk(dev);
-
- return NULL;
-}
-
-static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
-{
- struct gendisk *gp = v;
- struct device *dev;
-
- ++*pos;
- dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
- if (dev) {
- put_device(dev);
- return dev_to_disk(dev);
- }
- return NULL;
-}
-
-static void diskstats_stop(struct seq_file *part, void *v)
-{
-}
-
static int diskstats_show(struct seq_file *s, void *v)
{
struct gendisk *gp = v;
@@ -666,9 +625,9 @@ static int diskstats_show(struct seq_file *s, void *v)
}
const struct seq_operations diskstats_op = {
- .start = diskstats_start,
- .next = diskstats_next,
- .stop = diskstats_stop,
+ .start = disk_seqf_start,
+ .next = disk_seqf_next,
+ .stop = disk_seqf_stop,
.show = diskstats_show
};
#endif /* CONFIG_PROC_FS */
@@ -696,40 +655,23 @@ void genhd_media_change_notify(struct gendisk *disk)
EXPORT_SYMBOL_GPL(genhd_media_change_notify);
#endif /* 0 */
-struct find_block {
- const char *name;
- int part;
-};
-
-static int match_id(struct device *dev, void *data)
+dev_t blk_lookup_devt(const char *name, int part)
{
- struct find_block *find = data;
+ dev_t devt = MKDEV(0, 0);
+ struct class_dev_iter iter;
+ struct device *dev;
- if (dev->type != &disk_type)
- return 0;
- if (strcmp(dev->bus_id, find->name) == 0) {
+ class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
+ while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
- if (find->part < disk->minors)
- return 1;
- }
- return 0;
-}
-dev_t blk_lookup_devt(const char *name, int part)
-{
- struct device *dev;
- dev_t devt = MKDEV(0, 0);
- struct find_block find;
-
- find.name = name;
- find.part = part;
- dev = class_find_device(&block_class, NULL, &find, match_id);
- if (dev) {
- put_device(dev);
- devt = MKDEV(MAJOR(dev->devt),
- MINOR(dev->devt) + part);
+ if (!strcmp(dev->bus_id, name) && part < disk->minors) {
+ devt = MKDEV(MAJOR(dev->devt),
+ MINOR(dev->devt) + part);
+ break;
+ }
}
-
+ class_dev_iter_exit(&iter);
return devt;
}
EXPORT_SYMBOL(blk_lookup_devt);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-30 00:05:11 +0000