forked from Minki/linux
separate partition format handling from generic code
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
9be96f3fd1
commit
94ea4158f1
@ -6,7 +6,7 @@ obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o \
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blk-flush.o blk-settings.o blk-ioc.o blk-map.o \
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blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
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blk-iopoll.o blk-lib.o ioctl.o genhd.o scsi_ioctl.o \
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partitions/
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partition-generic.o partitions/
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obj-$(CONFIG_BLK_DEV_BSG) += bsg.o
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obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o
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537
block/partition-generic.c
Normal file
537
block/partition-generic.c
Normal file
@ -0,0 +1,537 @@
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/*
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* Code extracted from drivers/block/genhd.c
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*
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* We now have independent partition support from the
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* block drivers, which allows all the partition code to
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* be grouped in one location, and it to be mostly self
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* contained.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/ctype.h>
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#include <linux/genhd.h>
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#include <linux/blktrace_api.h>
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#include "partitions/check.h"
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#ifdef CONFIG_BLK_DEV_MD
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extern void md_autodetect_dev(dev_t dev);
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#endif
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/*
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* disk_name() is used by partition check code and the genhd driver.
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* It formats the devicename of the indicated disk into
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* the supplied buffer (of size at least 32), and returns
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* a pointer to that same buffer (for convenience).
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*/
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char *disk_name(struct gendisk *hd, int partno, char *buf)
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{
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if (!partno)
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snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
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else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
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snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
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else
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snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
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return buf;
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}
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const char *bdevname(struct block_device *bdev, char *buf)
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{
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return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
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}
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EXPORT_SYMBOL(bdevname);
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/*
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* There's very little reason to use this, you should really
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* have a struct block_device just about everywhere and use
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* bdevname() instead.
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*/
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const char *__bdevname(dev_t dev, char *buffer)
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{
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scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
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MAJOR(dev), MINOR(dev));
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return buffer;
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}
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EXPORT_SYMBOL(__bdevname);
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static ssize_t part_partition_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->partno);
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}
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static ssize_t part_start_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
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}
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ssize_t part_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
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}
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static ssize_t part_ro_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->policy ? 1 : 0);
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}
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static ssize_t part_alignment_offset_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
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}
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static ssize_t part_discard_alignment_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%u\n", p->discard_alignment);
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}
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ssize_t part_stat_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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int cpu;
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cpu = part_stat_lock();
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part_round_stats(cpu, p);
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part_stat_unlock();
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return sprintf(buf,
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"%8lu %8lu %8llu %8u "
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"%8lu %8lu %8llu %8u "
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"%8u %8u %8u"
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"\n",
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part_stat_read(p, ios[READ]),
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part_stat_read(p, merges[READ]),
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(unsigned long long)part_stat_read(p, sectors[READ]),
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jiffies_to_msecs(part_stat_read(p, ticks[READ])),
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part_stat_read(p, ios[WRITE]),
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part_stat_read(p, merges[WRITE]),
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(unsigned long long)part_stat_read(p, sectors[WRITE]),
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jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
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part_in_flight(p),
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jiffies_to_msecs(part_stat_read(p, io_ticks)),
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jiffies_to_msecs(part_stat_read(p, time_in_queue)));
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}
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ssize_t part_inflight_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
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atomic_read(&p->in_flight[1]));
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}
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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ssize_t part_fail_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->make_it_fail);
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}
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ssize_t part_fail_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct hd_struct *p = dev_to_part(dev);
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int i;
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if (count > 0 && sscanf(buf, "%d", &i) > 0)
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p->make_it_fail = (i == 0) ? 0 : 1;
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return count;
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}
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#endif
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static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
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static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
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static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
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static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
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static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
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static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
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NULL);
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static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
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static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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static struct device_attribute dev_attr_fail =
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__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
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#endif
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static struct attribute *part_attrs[] = {
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&dev_attr_partition.attr,
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&dev_attr_start.attr,
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&dev_attr_size.attr,
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&dev_attr_ro.attr,
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&dev_attr_alignment_offset.attr,
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&dev_attr_discard_alignment.attr,
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&dev_attr_stat.attr,
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&dev_attr_inflight.attr,
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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&dev_attr_fail.attr,
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#endif
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NULL
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};
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static struct attribute_group part_attr_group = {
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.attrs = part_attrs,
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};
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static const struct attribute_group *part_attr_groups[] = {
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&part_attr_group,
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#ifdef CONFIG_BLK_DEV_IO_TRACE
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&blk_trace_attr_group,
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#endif
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NULL
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};
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static void part_release(struct device *dev)
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{
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struct hd_struct *p = dev_to_part(dev);
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free_part_stats(p);
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free_part_info(p);
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kfree(p);
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}
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struct device_type part_type = {
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.name = "partition",
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.groups = part_attr_groups,
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.release = part_release,
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};
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static void delete_partition_rcu_cb(struct rcu_head *head)
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{
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struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
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part->start_sect = 0;
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part->nr_sects = 0;
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part_stat_set_all(part, 0);
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put_device(part_to_dev(part));
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}
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void __delete_partition(struct hd_struct *part)
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{
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call_rcu(&part->rcu_head, delete_partition_rcu_cb);
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}
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void delete_partition(struct gendisk *disk, int partno)
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{
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struct disk_part_tbl *ptbl = disk->part_tbl;
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struct hd_struct *part;
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if (partno >= ptbl->len)
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return;
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part = ptbl->part[partno];
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if (!part)
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return;
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blk_free_devt(part_devt(part));
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rcu_assign_pointer(ptbl->part[partno], NULL);
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rcu_assign_pointer(ptbl->last_lookup, NULL);
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kobject_put(part->holder_dir);
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device_del(part_to_dev(part));
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hd_struct_put(part);
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}
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static ssize_t whole_disk_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return 0;
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}
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static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
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whole_disk_show, NULL);
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struct hd_struct *add_partition(struct gendisk *disk, int partno,
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sector_t start, sector_t len, int flags,
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struct partition_meta_info *info)
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{
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struct hd_struct *p;
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dev_t devt = MKDEV(0, 0);
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struct device *ddev = disk_to_dev(disk);
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struct device *pdev;
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struct disk_part_tbl *ptbl;
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const char *dname;
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int err;
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err = disk_expand_part_tbl(disk, partno);
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if (err)
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return ERR_PTR(err);
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ptbl = disk->part_tbl;
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if (ptbl->part[partno])
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return ERR_PTR(-EBUSY);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return ERR_PTR(-EBUSY);
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if (!init_part_stats(p)) {
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err = -ENOMEM;
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goto out_free;
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}
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pdev = part_to_dev(p);
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p->start_sect = start;
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p->alignment_offset =
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queue_limit_alignment_offset(&disk->queue->limits, start);
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p->discard_alignment =
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queue_limit_discard_alignment(&disk->queue->limits, start);
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p->nr_sects = len;
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p->partno = partno;
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p->policy = get_disk_ro(disk);
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if (info) {
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struct partition_meta_info *pinfo = alloc_part_info(disk);
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if (!pinfo)
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goto out_free_stats;
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memcpy(pinfo, info, sizeof(*info));
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p->info = pinfo;
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}
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dname = dev_name(ddev);
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if (isdigit(dname[strlen(dname) - 1]))
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dev_set_name(pdev, "%sp%d", dname, partno);
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else
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dev_set_name(pdev, "%s%d", dname, partno);
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device_initialize(pdev);
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pdev->class = &block_class;
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pdev->type = &part_type;
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pdev->parent = ddev;
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err = blk_alloc_devt(p, &devt);
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if (err)
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goto out_free_info;
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pdev->devt = devt;
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/* delay uevent until 'holders' subdir is created */
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dev_set_uevent_suppress(pdev, 1);
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err = device_add(pdev);
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if (err)
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goto out_put;
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err = -ENOMEM;
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p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
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if (!p->holder_dir)
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goto out_del;
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dev_set_uevent_suppress(pdev, 0);
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if (flags & ADDPART_FLAG_WHOLEDISK) {
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err = device_create_file(pdev, &dev_attr_whole_disk);
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if (err)
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goto out_del;
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}
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/* everything is up and running, commence */
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rcu_assign_pointer(ptbl->part[partno], p);
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/* suppress uevent if the disk suppresses it */
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if (!dev_get_uevent_suppress(ddev))
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kobject_uevent(&pdev->kobj, KOBJ_ADD);
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hd_ref_init(p);
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return p;
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out_free_info:
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free_part_info(p);
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out_free_stats:
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free_part_stats(p);
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out_free:
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kfree(p);
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return ERR_PTR(err);
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out_del:
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kobject_put(p->holder_dir);
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device_del(pdev);
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out_put:
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put_device(pdev);
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blk_free_devt(devt);
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return ERR_PTR(err);
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}
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static bool disk_unlock_native_capacity(struct gendisk *disk)
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{
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const struct block_device_operations *bdops = disk->fops;
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if (bdops->unlock_native_capacity &&
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!(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
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printk(KERN_CONT "enabling native capacity\n");
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bdops->unlock_native_capacity(disk);
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disk->flags |= GENHD_FL_NATIVE_CAPACITY;
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return true;
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} else {
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printk(KERN_CONT "truncated\n");
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return false;
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}
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}
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int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
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{
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struct parsed_partitions *state = NULL;
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struct disk_part_iter piter;
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struct hd_struct *part;
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int p, highest, res;
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rescan:
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if (state && !IS_ERR(state)) {
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kfree(state);
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state = NULL;
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}
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if (bdev->bd_part_count)
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return -EBUSY;
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res = invalidate_partition(disk, 0);
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if (res)
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return res;
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disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
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while ((part = disk_part_iter_next(&piter)))
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delete_partition(disk, part->partno);
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disk_part_iter_exit(&piter);
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if (disk->fops->revalidate_disk)
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disk->fops->revalidate_disk(disk);
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check_disk_size_change(disk, bdev);
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bdev->bd_invalidated = 0;
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if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
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return 0;
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if (IS_ERR(state)) {
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/*
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* I/O error reading the partition table. If any
|
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* partition code tried to read beyond EOD, retry
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* after unlocking native capacity.
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*/
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if (PTR_ERR(state) == -ENOSPC) {
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printk(KERN_WARNING "%s: partition table beyond EOD, ",
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disk->disk_name);
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if (disk_unlock_native_capacity(disk))
|
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goto rescan;
|
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}
|
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return -EIO;
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}
|
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/*
|
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* If any partition code tried to read beyond EOD, try
|
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* unlocking native capacity even if partition table is
|
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* successfully read as we could be missing some partitions.
|
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*/
|
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if (state->access_beyond_eod) {
|
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printk(KERN_WARNING
|
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"%s: partition table partially beyond EOD, ",
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disk->disk_name);
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if (disk_unlock_native_capacity(disk))
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goto rescan;
|
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}
|
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|
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/* tell userspace that the media / partition table may have changed */
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kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
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|
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/* Detect the highest partition number and preallocate
|
||||
* disk->part_tbl. This is an optimization and not strictly
|
||||
* necessary.
|
||||
*/
|
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for (p = 1, highest = 0; p < state->limit; p++)
|
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if (state->parts[p].size)
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highest = p;
|
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|
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disk_expand_part_tbl(disk, highest);
|
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|
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/* 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)
|
||||
continue;
|
||||
|
||||
from = state->parts[p].from;
|
||||
if (from >= get_capacity(disk)) {
|
||||
printk(KERN_WARNING
|
||||
"%s: p%d start %llu is beyond EOD, ",
|
||||
disk->disk_name, p, (unsigned long long) from);
|
||||
if (disk_unlock_native_capacity(disk))
|
||||
goto rescan;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (from + size > get_capacity(disk)) {
|
||||
printk(KERN_WARNING
|
||||
"%s: p%d size %llu extends beyond EOD, ",
|
||||
disk->disk_name, p, (unsigned long long) size);
|
||||
|
||||
if (disk_unlock_native_capacity(disk)) {
|
||||
/* free state and restart */
|
||||
goto rescan;
|
||||
} else {
|
||||
/*
|
||||
* we can not ignore partitions of broken tables
|
||||
* created by for example camera firmware, but
|
||||
* we limit them to the end of the disk to avoid
|
||||
* creating invalid block devices
|
||||
*/
|
||||
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].info);
|
||||
if (IS_ERR(part)) {
|
||||
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
|
||||
disk->disk_name, p, -PTR_ERR(part));
|
||||
continue;
|
||||
}
|
||||
#ifdef CONFIG_BLK_DEV_MD
|
||||
if (state->parts[p].flags & ADDPART_FLAG_RAID)
|
||||
md_autodetect_dev(part_to_dev(part)->devt);
|
||||
#endif
|
||||
}
|
||||
kfree(state);
|
||||
return 0;
|
||||
}
|
||||
|
||||
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
|
||||
{
|
||||
struct address_space *mapping = bdev->bd_inode->i_mapping;
|
||||
struct page *page;
|
||||
|
||||
page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
|
||||
NULL);
|
||||
if (!IS_ERR(page)) {
|
||||
if (PageError(page))
|
||||
goto fail;
|
||||
p->v = page;
|
||||
return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
|
||||
fail:
|
||||
page_cache_release(page);
|
||||
}
|
||||
p->v = NULL;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(read_dev_sector);
|
||||
@ -13,14 +13,9 @@
|
||||
* Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/kmod.h>
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/genhd.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
|
||||
#include "check.h"
|
||||
|
||||
@ -39,10 +34,6 @@
|
||||
#include "karma.h"
|
||||
#include "sysv68.h"
|
||||
|
||||
#ifdef CONFIG_BLK_DEV_MD
|
||||
extern void md_autodetect_dev(dev_t dev);
|
||||
#endif
|
||||
|
||||
int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
|
||||
|
||||
static int (*check_part[])(struct parsed_partitions *) = {
|
||||
@ -114,48 +105,8 @@ static int (*check_part[])(struct parsed_partitions *) = {
|
||||
#endif
|
||||
NULL
|
||||
};
|
||||
|
||||
/*
|
||||
* disk_name() is used by partition check code and the genhd driver.
|
||||
* It formats the devicename of the indicated disk into
|
||||
* the supplied buffer (of size at least 32), and returns
|
||||
* a pointer to that same buffer (for convenience).
|
||||
*/
|
||||
|
||||
char *disk_name(struct gendisk *hd, int partno, char *buf)
|
||||
{
|
||||
if (!partno)
|
||||
snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
|
||||
else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
|
||||
snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
|
||||
else
|
||||
snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
|
||||
|
||||
return buf;
|
||||
}
|
||||
|
||||
const char *bdevname(struct block_device *bdev, char *buf)
|
||||
{
|
||||
return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(bdevname);
|
||||
|
||||
/*
|
||||
* There's very little reason to use this, you should really
|
||||
* have a struct block_device just about everywhere and use
|
||||
* bdevname() instead.
|
||||
*/
|
||||
const char *__bdevname(dev_t dev, char *buffer)
|
||||
{
|
||||
scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
|
||||
MAJOR(dev), MINOR(dev));
|
||||
return buffer;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(__bdevname);
|
||||
|
||||
static struct parsed_partitions *
|
||||
struct parsed_partitions *
|
||||
check_partition(struct gendisk *hd, struct block_device *bdev)
|
||||
{
|
||||
struct parsed_partitions *state;
|
||||
@ -213,475 +164,3 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
|
||||
kfree(state);
|
||||
return ERR_PTR(res);
|
||||
}
|
||||
|
||||
static ssize_t part_partition_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
|
||||
return sprintf(buf, "%d\n", p->partno);
|
||||
}
|
||||
|
||||
static ssize_t part_start_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
|
||||
return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
|
||||
}
|
||||
|
||||
ssize_t part_size_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
|
||||
}
|
||||
|
||||
static 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);
|
||||
}
|
||||
|
||||
static ssize_t part_alignment_offset_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
|
||||
}
|
||||
|
||||
static ssize_t part_discard_alignment_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
return sprintf(buf, "%u\n", p->discard_alignment);
|
||||
}
|
||||
|
||||
ssize_t part_stat_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
int cpu;
|
||||
|
||||
cpu = part_stat_lock();
|
||||
part_round_stats(cpu, p);
|
||||
part_stat_unlock();
|
||||
return sprintf(buf,
|
||||
"%8lu %8lu %8llu %8u "
|
||||
"%8lu %8lu %8llu %8u "
|
||||
"%8u %8u %8u"
|
||||
"\n",
|
||||
part_stat_read(p, ios[READ]),
|
||||
part_stat_read(p, merges[READ]),
|
||||
(unsigned long long)part_stat_read(p, sectors[READ]),
|
||||
jiffies_to_msecs(part_stat_read(p, ticks[READ])),
|
||||
part_stat_read(p, ios[WRITE]),
|
||||
part_stat_read(p, merges[WRITE]),
|
||||
(unsigned long long)part_stat_read(p, sectors[WRITE]),
|
||||
jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
|
||||
part_in_flight(p),
|
||||
jiffies_to_msecs(part_stat_read(p, io_ticks)),
|
||||
jiffies_to_msecs(part_stat_read(p, time_in_queue)));
|
||||
}
|
||||
|
||||
ssize_t part_inflight_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
|
||||
return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
|
||||
atomic_read(&p->in_flight[1]));
|
||||
}
|
||||
|
||||
#ifdef CONFIG_FAIL_MAKE_REQUEST
|
||||
ssize_t part_fail_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
|
||||
return sprintf(buf, "%d\n", p->make_it_fail);
|
||||
}
|
||||
|
||||
ssize_t part_fail_store(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
int i;
|
||||
|
||||
if (count > 0 && sscanf(buf, "%d", &i) > 0)
|
||||
p->make_it_fail = (i == 0) ? 0 : 1;
|
||||
|
||||
return count;
|
||||
}
|
||||
#endif
|
||||
|
||||
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);
|
||||
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
|
||||
static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
|
||||
#ifdef CONFIG_FAIL_MAKE_REQUEST
|
||||
static struct device_attribute dev_attr_fail =
|
||||
__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
|
||||
#endif
|
||||
|
||||
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,
|
||||
&dev_attr_inflight.attr,
|
||||
#ifdef CONFIG_FAIL_MAKE_REQUEST
|
||||
&dev_attr_fail.attr,
|
||||
#endif
|
||||
NULL
|
||||
};
|
||||
|
||||
static struct attribute_group part_attr_group = {
|
||||
.attrs = part_attrs,
|
||||
};
|
||||
|
||||
static const struct attribute_group *part_attr_groups[] = {
|
||||
&part_attr_group,
|
||||
#ifdef CONFIG_BLK_DEV_IO_TRACE
|
||||
&blk_trace_attr_group,
|
||||
#endif
|
||||
NULL
|
||||
};
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
struct device_type part_type = {
|
||||
.name = "partition",
|
||||
.groups = part_attr_groups,
|
||||
.release = part_release,
|
||||
};
|
||||
|
||||
static void delete_partition_rcu_cb(struct rcu_head *head)
|
||||
{
|
||||
struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
|
||||
|
||||
part->start_sect = 0;
|
||||
part->nr_sects = 0;
|
||||
part_stat_set_all(part, 0);
|
||||
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;
|
||||
struct hd_struct *part;
|
||||
|
||||
if (partno >= ptbl->len)
|
||||
return;
|
||||
|
||||
part = ptbl->part[partno];
|
||||
if (!part)
|
||||
return;
|
||||
|
||||
blk_free_devt(part_devt(part));
|
||||
rcu_assign_pointer(ptbl->part[partno], NULL);
|
||||
rcu_assign_pointer(ptbl->last_lookup, NULL);
|
||||
kobject_put(part->holder_dir);
|
||||
device_del(part_to_dev(part));
|
||||
|
||||
hd_struct_put(part);
|
||||
}
|
||||
|
||||
static ssize_t whole_disk_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
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,
|
||||
struct partition_meta_info *info)
|
||||
{
|
||||
struct hd_struct *p;
|
||||
dev_t devt = MKDEV(0, 0);
|
||||
struct device *ddev = disk_to_dev(disk);
|
||||
struct device *pdev;
|
||||
struct disk_part_tbl *ptbl;
|
||||
const char *dname;
|
||||
int err;
|
||||
|
||||
err = disk_expand_part_tbl(disk, partno);
|
||||
if (err)
|
||||
return ERR_PTR(err);
|
||||
ptbl = disk->part_tbl;
|
||||
|
||||
if (ptbl->part[partno])
|
||||
return ERR_PTR(-EBUSY);
|
||||
|
||||
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
||||
if (!p)
|
||||
return ERR_PTR(-EBUSY);
|
||||
|
||||
if (!init_part_stats(p)) {
|
||||
err = -ENOMEM;
|
||||
goto out_free;
|
||||
}
|
||||
pdev = part_to_dev(p);
|
||||
|
||||
p->start_sect = start;
|
||||
p->alignment_offset =
|
||||
queue_limit_alignment_offset(&disk->queue->limits, start);
|
||||
p->discard_alignment =
|
||||
queue_limit_discard_alignment(&disk->queue->limits, start);
|
||||
p->nr_sects = len;
|
||||
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);
|
||||
else
|
||||
dev_set_name(pdev, "%s%d", dname, partno);
|
||||
|
||||
device_initialize(pdev);
|
||||
pdev->class = &block_class;
|
||||
pdev->type = &part_type;
|
||||
pdev->parent = ddev;
|
||||
|
||||
err = blk_alloc_devt(p, &devt);
|
||||
if (err)
|
||||
goto out_free_info;
|
||||
pdev->devt = devt;
|
||||
|
||||
/* delay uevent until 'holders' subdir is created */
|
||||
dev_set_uevent_suppress(pdev, 1);
|
||||
err = device_add(pdev);
|
||||
if (err)
|
||||
goto out_put;
|
||||
|
||||
err = -ENOMEM;
|
||||
p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
|
||||
if (!p->holder_dir)
|
||||
goto out_del;
|
||||
|
||||
dev_set_uevent_suppress(pdev, 0);
|
||||
if (flags & ADDPART_FLAG_WHOLEDISK) {
|
||||
err = device_create_file(pdev, &dev_attr_whole_disk);
|
||||
if (err)
|
||||
goto out_del;
|
||||
}
|
||||
|
||||
/* everything is up and running, commence */
|
||||
rcu_assign_pointer(ptbl->part[partno], p);
|
||||
|
||||
/* suppress uevent if the disk suppresses it */
|
||||
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:
|
||||
kfree(p);
|
||||
return ERR_PTR(err);
|
||||
out_del:
|
||||
kobject_put(p->holder_dir);
|
||||
device_del(pdev);
|
||||
out_put:
|
||||
put_device(pdev);
|
||||
blk_free_devt(devt);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
static bool disk_unlock_native_capacity(struct gendisk *disk)
|
||||
{
|
||||
const struct block_device_operations *bdops = disk->fops;
|
||||
|
||||
if (bdops->unlock_native_capacity &&
|
||||
!(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
|
||||
printk(KERN_CONT "enabling native capacity\n");
|
||||
bdops->unlock_native_capacity(disk);
|
||||
disk->flags |= GENHD_FL_NATIVE_CAPACITY;
|
||||
return true;
|
||||
} else {
|
||||
printk(KERN_CONT "truncated\n");
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
|
||||
{
|
||||
struct parsed_partitions *state = NULL;
|
||||
struct disk_part_iter piter;
|
||||
struct hd_struct *part;
|
||||
int p, highest, res;
|
||||
rescan:
|
||||
if (state && !IS_ERR(state)) {
|
||||
kfree(state);
|
||||
state = NULL;
|
||||
}
|
||||
|
||||
if (bdev->bd_part_count)
|
||||
return -EBUSY;
|
||||
res = invalidate_partition(disk, 0);
|
||||
if (res)
|
||||
return res;
|
||||
|
||||
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
|
||||
while ((part = disk_part_iter_next(&piter)))
|
||||
delete_partition(disk, part->partno);
|
||||
disk_part_iter_exit(&piter);
|
||||
|
||||
if (disk->fops->revalidate_disk)
|
||||
disk->fops->revalidate_disk(disk);
|
||||
check_disk_size_change(disk, bdev);
|
||||
bdev->bd_invalidated = 0;
|
||||
if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
|
||||
return 0;
|
||||
if (IS_ERR(state)) {
|
||||
/*
|
||||
* I/O error reading the partition table. If any
|
||||
* partition code tried to read beyond EOD, retry
|
||||
* after unlocking native capacity.
|
||||
*/
|
||||
if (PTR_ERR(state) == -ENOSPC) {
|
||||
printk(KERN_WARNING "%s: partition table beyond EOD, ",
|
||||
disk->disk_name);
|
||||
if (disk_unlock_native_capacity(disk))
|
||||
goto rescan;
|
||||
}
|
||||
return -EIO;
|
||||
}
|
||||
/*
|
||||
* If any partition code tried to read beyond EOD, try
|
||||
* unlocking native capacity even if partition table is
|
||||
* successfully read as we could be missing some partitions.
|
||||
*/
|
||||
if (state->access_beyond_eod) {
|
||||
printk(KERN_WARNING
|
||||
"%s: partition table partially beyond EOD, ",
|
||||
disk->disk_name);
|
||||
if (disk_unlock_native_capacity(disk))
|
||||
goto rescan;
|
||||
}
|
||||
|
||||
/* tell userspace that the media / partition table may have changed */
|
||||
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
||||
|
||||
/* Detect the highest partition number and preallocate
|
||||
* disk->part_tbl. This is an optimization and not strictly
|
||||
* necessary.
|
||||
*/
|
||||
for (p = 1, highest = 0; p < state->limit; p++)
|
||||
if (state->parts[p].size)
|
||||
highest = p;
|
||||
|
||||
disk_expand_part_tbl(disk, highest);
|
||||
|
||||
/* 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)
|
||||
continue;
|
||||
|
||||
from = state->parts[p].from;
|
||||
if (from >= get_capacity(disk)) {
|
||||
printk(KERN_WARNING
|
||||
"%s: p%d start %llu is beyond EOD, ",
|
||||
disk->disk_name, p, (unsigned long long) from);
|
||||
if (disk_unlock_native_capacity(disk))
|
||||
goto rescan;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (from + size > get_capacity(disk)) {
|
||||
printk(KERN_WARNING
|
||||
"%s: p%d size %llu extends beyond EOD, ",
|
||||
disk->disk_name, p, (unsigned long long) size);
|
||||
|
||||
if (disk_unlock_native_capacity(disk)) {
|
||||
/* free state and restart */
|
||||
goto rescan;
|
||||
} else {
|
||||
/*
|
||||
* we can not ignore partitions of broken tables
|
||||
* created by for example camera firmware, but
|
||||
* we limit them to the end of the disk to avoid
|
||||
* creating invalid block devices
|
||||
*/
|
||||
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].info);
|
||||
if (IS_ERR(part)) {
|
||||
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
|
||||
disk->disk_name, p, -PTR_ERR(part));
|
||||
continue;
|
||||
}
|
||||
#ifdef CONFIG_BLK_DEV_MD
|
||||
if (state->parts[p].flags & ADDPART_FLAG_RAID)
|
||||
md_autodetect_dev(part_to_dev(part)->devt);
|
||||
#endif
|
||||
}
|
||||
kfree(state);
|
||||
return 0;
|
||||
}
|
||||
|
||||
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
|
||||
{
|
||||
struct address_space *mapping = bdev->bd_inode->i_mapping;
|
||||
struct page *page;
|
||||
|
||||
page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
|
||||
NULL);
|
||||
if (!IS_ERR(page)) {
|
||||
if (PageError(page))
|
||||
goto fail;
|
||||
p->v = page;
|
||||
return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
|
||||
fail:
|
||||
page_cache_release(page);
|
||||
}
|
||||
p->v = NULL;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(read_dev_sector);
|
||||
|
||||
@ -22,6 +22,9 @@ struct parsed_partitions {
|
||||
char *pp_buf;
|
||||
};
|
||||
|
||||
struct parsed_partitions *
|
||||
check_partition(struct gendisk *, struct block_device *);
|
||||
|
||||
static inline void *read_part_sector(struct parsed_partitions *state,
|
||||
sector_t n, Sector *p)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user