Messages in this thread Patch in this message | | | Date | Thu, 9 Dec 2004 04:18:10 -0300 | From | Alberto Bertogli <> | Subject | [PATCH] Export disk->policy to sysfs |
| |
Hi!
This small patch against 2.6.10-rc3 exports the disk->policy variable to sysfs as /sys/block/DEVICE/read_only.
It can be useful for people or scripts wanting to check the state of a device, specially now that USB storage has write protect detection.
Thanks, Alberto
--- linux-2.6.10-rc3/drivers/block/genhd.c.orig 2004-12-09 03:39:20.000000000 -0300 +++ linux-2.6.10-rc3/drivers/block/genhd.c 2004-12-09 03:48:44.000000000 -0300 @@ -384,6 +384,10 @@ jiffies_to_msecs(disk_stat_read(disk, io_ticks)), jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); } +static ssize_t disk_read_only_read(struct gendisk * disk, char *page) +{ + return sprintf(page, "%d\n", disk->policy); +} static struct disk_attribute disk_attr_dev = { .attr = {.name = "dev", .mode = S_IRUGO }, .show = disk_dev_read @@ -404,6 +408,10 @@ .attr = {.name = "stat", .mode = S_IRUGO }, .show = disk_stats_read }; +static struct disk_attribute disk_attr_read_only = { + .attr = {.name = "read_only", .mode = S_IRUGO }, + .show = disk_read_only_read +}; static struct attribute * default_attrs[] = { &disk_attr_dev.attr, @@ -411,6 +419,7 @@ &disk_attr_removable.attr, &disk_attr_size.attr, &disk_attr_stat.attr, + &disk_attr_read_only.attr, NULL, };
| |