From 5037108acd4dc40c210321cc83b0bf8352eda95a Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Wed, 1 Oct 2008 14:39:17 +0100 Subject: dm: always allow one page in dm_merge_bvec Some callers assume they can always add at least one page to an empty bio, so dm_merge_bvec should not return 0 in this case: we'll reject the I/O later after the bio is submitted. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/md/dm.c') diff --git a/drivers/md/dm.c b/drivers/md/dm.c index bca448e11878..469cec54f371 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -837,10 +837,10 @@ static int dm_merge_bvec(struct request_queue *q, struct dm_table *map = dm_get_table(md); struct dm_target *ti; sector_t max_sectors; - int max_size; + int max_size = 0; if (unlikely(!map)) - return 0; + goto out; ti = dm_table_find_target(map, bvm->bi_sector); @@ -861,14 +861,15 @@ static int dm_merge_bvec(struct request_queue *q, if (max_size && ti->type->merge) max_size = ti->type->merge(ti, bvm, biovec, max_size); + dm_table_put(map); + +out: /* * Always allow an entire first page */ if (max_size <= biovec->bv_len && !(bvm->bi_size >> SECTOR_SHIFT)) max_size = biovec->bv_len; - dm_table_put(map); - return max_size; } -- cgit v1.2.3 From b01cd5ac43b00c49759c126c21e7d22c7e80b245 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Wed, 1 Oct 2008 14:39:24 +0100 Subject: dm: cope with access beyond end of device in dm_merge_bvec If for any reason dm_merge_bvec() is given an offset beyond the end of the device, avoid an oops and always allow one page to be added to an empty bio. We'll reject the I/O later after the bio is submitted. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/md/dm.c') diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 469cec54f371..ace998ce59f6 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -843,6 +843,8 @@ static int dm_merge_bvec(struct request_queue *q, goto out; ti = dm_table_find_target(map, bvm->bi_sector); + if (!dm_target_is_valid(ti)) + goto out_table; /* * Find maximum amount of I/O that won't need splitting @@ -861,6 +863,7 @@ static int dm_merge_bvec(struct request_queue *q, if (max_size && ti->type->merge) max_size = ti->type->merge(ti, bvm, biovec, max_size); +out_table: dm_table_put(map); out: -- cgit v1.2.3 From f331c0296f2a9fee0d396a70598b954062603015 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 3 Sep 2008 09:01:48 +0200 Subject: block: don't depend on consecutive minor space * Implement disk_devt() and part_devt() and use them to directly access devt instead of computing it from ->major and ->first_minor. Note that all references to ->major and ->first_minor outside of block layer is used to determine devt of the disk (the part0) and as ->major and ->first_minor will continue to represent devt for the disk, converting these users aren't strictly necessary. However, convert them for consistency. * Implement disk_max_parts() to avoid directly deferencing genhd->minors. * Update bdget_disk() such that it doesn't assume consecutive minor space. * Move devt computation from register_disk() to add_disk() and make it the only one (all other usages use the initially determined value). These changes clean up the code and will help disk->part dereference fix and extended block device numbers. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- block/genhd.c | 107 +++++++++++++++++++++++++----------- block/ioctl.c | 6 +- drivers/block/pktcdvd.c | 2 +- drivers/block/ps3disk.c | 2 +- drivers/char/random.c | 6 +- drivers/md/dm-ioctl.c | 4 +- drivers/md/dm-stripe.c | 4 +- drivers/md/dm.c | 7 ++- drivers/memstick/core/mspro_block.c | 2 +- drivers/mmc/card/block.c | 2 +- drivers/s390/block/dasd_proc.c | 3 +- drivers/s390/block/dcssblk.c | 4 +- drivers/scsi/sr.c | 2 +- fs/block_dev.c | 2 +- fs/partitions/check.c | 19 ++++--- include/linux/genhd.h | 27 +++++++-- 16 files changed, 132 insertions(+), 67 deletions(-) (limited to 'drivers/md/dm.c') diff --git a/block/genhd.c b/block/genhd.c index dc9ad4c171e2..fa32d09fda24 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -186,13 +186,14 @@ void add_disk(struct gendisk *disk) int retval; disk->flags |= GENHD_FL_UP; - blk_register_region(MKDEV(disk->major, disk->first_minor), - disk->minors, NULL, exact_match, exact_lock, disk); + disk->dev.devt = MKDEV(disk->major, disk->first_minor); + blk_register_region(disk_devt(disk), disk->minors, NULL, + exact_match, exact_lock, disk); register_disk(disk); blk_register_queue(disk); bdi = &disk->queue->backing_dev_info; - bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor)); + bdi_register_dev(bdi, disk_devt(disk)); retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); WARN_ON(retval); } @@ -205,8 +206,7 @@ void unlink_gendisk(struct gendisk *disk) sysfs_remove_link(&disk->dev.kobj, "bdi"); bdi_unregister(&disk->queue->backing_dev_info); blk_unregister_queue(disk); - blk_unregister_region(MKDEV(disk->major, disk->first_minor), - disk->minors); + blk_unregister_region(disk_devt(disk), disk->minors); } /** @@ -225,6 +225,38 @@ struct gendisk *get_gendisk(dev_t devt, int *partno) return kobj ? dev_to_disk(dev) : NULL; } +/** + * bdget_disk - do bdget() by gendisk and partition number + * @disk: gendisk of interest + * @partno: partition number + * + * Find partition @partno from @disk, do bdget() on it. + * + * CONTEXT: + * Don't care. + * + * RETURNS: + * Resulting block_device on success, NULL on failure. + */ +extern struct block_device *bdget_disk(struct gendisk *disk, int partno) +{ + dev_t devt = MKDEV(0, 0); + + if (partno == 0) + devt = disk_devt(disk); + else { + struct hd_struct *part = disk->part[partno - 1]; + + if (part && part->nr_sects) + devt = part_devt(part); + } + + if (likely(devt != MKDEV(0, 0))) + return bdget(devt); + return NULL; +} +EXPORT_SYMBOL(bdget_disk); + /* * 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 @@ -255,7 +287,7 @@ void __init printk_all_partitions(void) * option takes. */ printk("%02x%02x %10llu %s", - disk->major, disk->first_minor, + MAJOR(disk_devt(disk)), MINOR(disk_devt(disk)), (unsigned long long)get_capacity(disk) >> 1, disk_name(disk, 0, buf)); if (disk->driverfs_dev != NULL && @@ -266,15 +298,15 @@ void __init printk_all_partitions(void) 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) + for (n = 0; n < disk_max_parts(disk); ++n) { + struct hd_struct *part = disk->part[n]; + + if (!part || !part->nr_sects) 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)); + MAJOR(part_devt(part)), MINOR(part_devt(part)), + (unsigned long long)part->nr_sects >> 1, + disk_name(disk, part->partno, buf)); } } class_dev_iter_exit(&iter); @@ -343,26 +375,27 @@ static int show_partition(struct seq_file *seqf, void *v) char buf[BDEVNAME_SIZE]; /* Don't show non-partitionable removeable devices or empty devices */ - if (!get_capacity(sgp) || - (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) + if (!get_capacity(sgp) || (!disk_max_parts(sgp) && + (sgp->flags & GENHD_FL_REMOVABLE))) return 0; if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) return 0; /* show the full disk and all non-0 size partitions of it */ seq_printf(seqf, "%4d %4d %10llu %s\n", - sgp->major, sgp->first_minor, + MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)), (unsigned long long)get_capacity(sgp) >> 1, disk_name(sgp, 0, buf)); - for (n = 0; n < sgp->minors - 1; n++) { - if (!sgp->part[n]) + for (n = 0; n < disk_max_parts(sgp); n++) { + struct hd_struct *part = sgp->part[n]; + if (!part) continue; - if (sgp->part[n]->nr_sects == 0) + if (part->nr_sects == 0) continue; seq_printf(seqf, "%4d %4d %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)); + MAJOR(part_devt(part)), MINOR(part_devt(part)), + (unsigned long long)part->nr_sects >> 1, + disk_name(sgp, part->partno, buf)); } return 0; @@ -578,7 +611,8 @@ static int diskstats_show(struct seq_file *seqf, void *v) disk_round_stats(gp); preempt_enable(); seq_printf(seqf, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", - gp->major, gp->first_minor, disk_name(gp, 0, buf), + MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), + disk_name(gp, 0, buf), disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), (unsigned long long)disk_stat_read(gp, sectors[0]), jiffies_to_msecs(disk_stat_read(gp, ticks[0])), @@ -590,7 +624,7 @@ static int diskstats_show(struct seq_file *seqf, void *v) jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); /* now show all non-0 size partitions of it */ - for (n = 0; n < gp->minors - 1; n++) { + for (n = 0; n < disk_max_parts(gp); n++) { struct hd_struct *hd = gp->part[n]; if (!hd || !hd->nr_sects) @@ -601,8 +635,8 @@ static int diskstats_show(struct seq_file *seqf, void *v) preempt_enable(); seq_printf(seqf, "%4d %4d %s %lu %lu %llu " "%u %lu %lu %llu %u %u %u %u\n", - gp->major, n + gp->first_minor + 1, - disk_name(gp, n + 1, buf), + MAJOR(part_devt(hd)), MINOR(part_devt(hd)), + disk_name(gp, hd->partno, buf), part_stat_read(hd, ios[0]), part_stat_read(hd, merges[0]), (unsigned long long)part_stat_read(hd, sectors[0]), @@ -661,11 +695,22 @@ dev_t blk_lookup_devt(const char *name, int partno) while ((dev = class_dev_iter_next(&iter))) { struct gendisk *disk = dev_to_disk(dev); - if (!strcmp(dev->bus_id, name) && partno < disk->minors) { - devt = MKDEV(MAJOR(dev->devt), - MINOR(dev->devt) + partno); - break; + if (strcmp(dev->bus_id, name)) + continue; + if (partno < 0 || partno > disk_max_parts(disk)) + continue; + + if (partno == 0) + devt = disk_devt(disk); + else { + struct hd_struct *part = disk->part[partno - 1]; + + if (!part || !part->nr_sects) + continue; + + devt = part_devt(part); } + break; } class_dev_iter_exit(&iter); return devt; @@ -755,7 +800,7 @@ void set_disk_ro(struct gendisk *disk, int flag) { int i; disk->policy = flag; - for (i = 0; i < disk->minors - 1; i++) + for (i = 0; i < disk_max_parts(disk); i++) if (disk->part[i]) disk->part[i]->policy = flag; } diff --git a/block/ioctl.c b/block/ioctl.c index d77f5e280a6e..403f7d7e0c28 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -29,7 +29,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user if (bdev != bdev->bd_contains) return -EINVAL; partno = p.pno; - if (partno <= 0 || partno >= disk->minors) + if (partno <= 0 || partno > disk_max_parts(disk)) return -EINVAL; switch (a.op) { case BLKPG_ADD_PARTITION: @@ -47,7 +47,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user mutex_lock(&bdev->bd_mutex); /* overlap? */ - for (i = 0; i < disk->minors - 1; i++) { + for (i = 0; i < disk_max_parts(disk); i++) { struct hd_struct *s = disk->part[i]; if (!s) @@ -96,7 +96,7 @@ static int blkdev_reread_part(struct block_device *bdev) struct gendisk *disk = bdev->bd_disk; int res; - if (disk->minors == 1 || bdev != bdev->bd_contains) + if (!disk_max_parts(disk) || bdev != bdev->bd_contains) return -EINVAL; if (!capable(CAP_SYS_ADMIN)) return -EACCES; diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index 29b7a648cc6e..e1a90bbb4747 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -2911,7 +2911,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) if (!disk->queue) goto out_mem2; - pd->pkt_dev = MKDEV(disk->major, disk->first_minor); + pd->pkt_dev = MKDEV(pktdev_major, idx); ret = pkt_new_dev(pd, dev); if (ret) goto out_new_dev; diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c index 4b0d6c7f4c66..936466f62afd 100644 --- a/drivers/block/ps3disk.c +++ b/drivers/block/ps3disk.c @@ -541,7 +541,7 @@ static int ps3disk_remove(struct ps3_system_bus_device *_dev) struct ps3disk_private *priv = dev->sbd.core.driver_data; mutex_lock(&ps3disk_mask_mutex); - __clear_bit(priv->gendisk->first_minor / PS3DISK_MINORS, + __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS, &ps3disk_mask); mutex_unlock(&ps3disk_mask_mutex); del_gendisk(priv->gendisk); diff --git a/drivers/char/random.c b/drivers/char/random.c index 7ce1ac4baa6d..6af435b89867 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -661,10 +661,10 @@ void add_disk_randomness(struct gendisk *disk) if (!disk || !disk->random) return; /* first major is 1, so we get >= 0x200 here */ - DEBUG_ENT("disk event %d:%d\n", disk->major, disk->first_minor); + DEBUG_ENT("disk event %d:%d\n", + MAJOR(disk_devt(disk)), MINOR(disk_devt(disk))); - add_timer_randomness(disk->random, - 0x100 + MKDEV(disk->major, disk->first_minor)); + add_timer_randomness(disk->random, 0x100 + disk_devt(disk)); } #endif diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index b262c0042de3..c3de311117a1 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -426,7 +426,7 @@ static int list_devices(struct dm_ioctl *param, size_t param_size) old_nl->next = (uint32_t) ((void *) nl - (void *) old_nl); disk = dm_disk(hc->md); - nl->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor)); + nl->dev = huge_encode_dev(disk_devt(disk)); nl->next = 0; strcpy(nl->name, hc->name); @@ -539,7 +539,7 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param) if (dm_suspended(md)) param->flags |= DM_SUSPEND_FLAG; - param->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor)); + param->dev = huge_encode_dev(disk_devt(disk)); /* * Yes, this will be out of date by the time it gets back diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 4de90ab3968b..b745d8ac625b 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -284,8 +284,8 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio, memset(major_minor, 0, sizeof(major_minor)); sprintf(major_minor, "%d:%d", - bio->bi_bdev->bd_disk->major, - bio->bi_bdev->bd_disk->first_minor); + MAJOR(disk_devt(bio->bi_bdev->bd_disk)), + MINOR(disk_devt(bio->bi_bdev->bd_disk))); /* * Test to see which stripe drive triggered the event diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ace998ce59f6..a78caad29996 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1146,7 +1146,7 @@ static void unlock_fs(struct mapped_device *md); static void free_dev(struct mapped_device *md) { - int minor = md->disk->first_minor; + int minor = MINOR(disk_devt(md->disk)); if (md->suspended_bdev) { unlock_fs(md); @@ -1267,7 +1267,7 @@ static struct mapped_device *dm_find_md(dev_t dev) md = idr_find(&_minor_idr, minor); if (md && (md == MINOR_ALLOCED || - (dm_disk(md)->first_minor != minor) || + (MINOR(disk_devt(dm_disk(md))) != minor) || test_bit(DMF_FREEING, &md->flags))) { md = NULL; goto out; @@ -1318,7 +1318,8 @@ void dm_put(struct mapped_device *md) if (atomic_dec_and_lock(&md->holders, &_minor_lock)) { map = dm_get_table(md); - idr_replace(&_minor_idr, MINOR_ALLOCED, dm_disk(md)->first_minor); + idr_replace(&_minor_idr, MINOR_ALLOCED, + MINOR(disk_devt(dm_disk(md)))); set_bit(DMF_FREEING, &md->flags); spin_unlock(&_minor_lock); if (!dm_suspended(md)) { diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c index d2d2318dafa4..82bf649ef138 100644 --- a/drivers/memstick/core/mspro_block.c +++ b/drivers/memstick/core/mspro_block.c @@ -197,7 +197,7 @@ static int mspro_block_bd_open(struct inode *inode, struct file *filp) static int mspro_block_disk_release(struct gendisk *disk) { struct mspro_block_data *msb = disk->private_data; - int disk_id = disk->first_minor >> MSPRO_BLOCK_PART_SHIFT; + int disk_id = MINOR(disk_devt(disk)) >> MSPRO_BLOCK_PART_SHIFT; mutex_lock(&mspro_block_disk_lock); diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index ebc8b9d77613..97156b689e82 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -83,7 +83,7 @@ static void mmc_blk_put(struct mmc_blk_data *md) mutex_lock(&open_lock); md->usage--; if (md->usage == 0) { - int devidx = md->disk->first_minor >> MMC_SHIFT; + int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT; __clear_bit(devidx, dev_use); put_disk(md->disk); diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c index 03c0e40a92ff..e3b5c4d3036e 100644 --- a/drivers/s390/block/dasd_proc.c +++ b/drivers/s390/block/dasd_proc.c @@ -76,7 +76,8 @@ dasd_devices_show(struct seq_file *m, void *v) /* Print kdev. */ if (block->gdp) seq_printf(m, " at (%3d:%6d)", - block->gdp->major, block->gdp->first_minor); + MAJOR(disk_devt(block->gdp)), + MINOR(disk_devt(block->gdp))); else seq_printf(m, " at (???:??????)"); /* Print device name. */ diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 711b3004b3e6..9481e4a3f76e 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -114,7 +114,7 @@ dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) found = 0; // test if minor available list_for_each_entry(entry, &dcssblk_devices, lh) - if (minor == entry->gd->first_minor) + if (minor == MINOR(disk_devt(entry->gd))) found++; if (!found) break; // got unused minor } @@ -397,7 +397,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char goto unload_seg; } sprintf(dev_info->gd->disk_name, "dcssblk%d", - dev_info->gd->first_minor); + MINOR(disk_devt(dev_info->gd))); list_add_tail(&dev_info->lh, &dcssblk_devices); if (!try_module_get(THIS_MODULE)) { diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 27f5bfd1def3..8dbe3798d5fd 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -878,7 +878,7 @@ static void sr_kref_release(struct kref *kref) struct gendisk *disk = cd->disk; spin_lock(&sr_index_lock); - clear_bit(disk->first_minor, sr_index_bits); + clear_bit(MINOR(disk_devt(disk)), sr_index_bits); spin_unlock(&sr_index_lock); unregister_cdrom(&cd->cdi); diff --git a/fs/block_dev.c b/fs/block_dev.c index de0776cd7215..72e0a2887cb7 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -892,7 +892,7 @@ int check_disk_change(struct block_device *bdev) if (bdops->revalidate_disk) bdops->revalidate_disk(bdev->bd_disk); - if (bdev->bd_disk->minors > 1) + if (disk_max_parts(bdev->bd_disk)) bdev->bd_invalidated = 1; return 1; } diff --git a/fs/partitions/check.c b/fs/partitions/check.c index b86aab1b0df6..e77fa144a07d 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -134,7 +134,11 @@ char *disk_name(struct gendisk *hd, int partno, char *buf) const char *bdevname(struct block_device *bdev, char *buf) { - int partno = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor; + int partno = 0; + + if (bdev->bd_part) + partno = bdev->bd_part->partno; + return disk_name(bdev->bd_disk, partno, buf); } @@ -169,7 +173,7 @@ check_partition(struct gendisk *hd, struct block_device *bdev) if (isdigit(state->name[strlen(state->name)-1])) sprintf(state->name, "p"); - state->limit = hd->minors; + state->limit = disk_max_parts(hd) + 1; i = res = err = 0; while (!res && check_part[i]) { memset(&state->parts, 0, sizeof(state->parts)); @@ -416,7 +420,6 @@ void register_disk(struct gendisk *disk) int err; disk->dev.parent = disk->driverfs_dev; - disk->dev.devt = MKDEV(disk->major, disk->first_minor); strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE); /* ewww... some of these buggers have / in the name... */ @@ -440,7 +443,7 @@ void register_disk(struct gendisk *disk) disk_sysfs_add_subdirs(disk); /* No minors to use for partitions */ - if (disk->minors == 1) + if (!disk_max_parts(disk)) goto exit; /* No such device (e.g., media were just removed) */ @@ -463,8 +466,8 @@ exit: kobject_uevent(&disk->dev.kobj, KOBJ_ADD); /* announce possible partitions */ - for (i = 1; i < disk->minors; i++) { - p = disk->part[i-1]; + for (i = 0; i < disk_max_parts(disk); i++) { + p = disk->part[i]; if (!p || !p->nr_sects) continue; kobject_uevent(&p->dev.kobj, KOBJ_ADD); @@ -482,7 +485,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev) if (res) return res; bdev->bd_invalidated = 0; - for (p = 1; p < disk->minors; p++) + for (p = 1; p <= disk_max_parts(disk); p++) delete_partition(disk, p); if (disk->fops->revalidate_disk) disk->fops->revalidate_disk(disk); @@ -545,7 +548,7 @@ void del_gendisk(struct gendisk *disk) int p; /* invalidate stuff */ - for (p = disk->minors - 1; p > 0; p--) { + for (p = disk_max_parts(disk); p > 0; p--) { invalidate_partition(disk, p); delete_partition(disk, p); } diff --git a/include/linux/genhd.h b/include/linux/genhd.h index d1723c0a8600..0ff75329199c 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -111,10 +111,14 @@ struct hd_struct { #define GENHD_FL_FAIL 64 struct gendisk { + /* major, first_minor and minors are input parameters only, + * don't use directly. Use disk_devt() and disk_max_parts(). + */ int major; /* major number of driver */ int first_minor; int minors; /* maximum number of minors, =1 for * disks that can't be partitioned. */ + char disk_name[32]; /* name of major driver */ struct hd_struct **part; /* [indexed by minor - 1] */ struct block_device_operations *fops; @@ -152,6 +156,21 @@ static inline struct gendisk *part_to_disk(struct hd_struct *part) return NULL; } +static inline int disk_max_parts(struct gendisk *disk) +{ + return disk->minors - 1; +} + +static inline dev_t disk_devt(struct gendisk *disk) +{ + return disk->dev.devt; +} + +static inline dev_t part_devt(struct hd_struct *part) +{ + return part->dev.devt; +} + /* * Macros to operate on percpu disk statistics: * @@ -163,7 +182,7 @@ static inline struct hd_struct *disk_map_sector(struct gendisk *gendiskp, { struct hd_struct *part; int i; - for (i = 0; i < gendiskp->minors - 1; i++) { + for (i = 0; i < disk_max_parts(gendiskp); i++) { part = gendiskp->part[i]; if (part && part->start_sect <= sector && sector < part->start_sect + part->nr_sects) @@ -366,6 +385,7 @@ extern void add_disk(struct gendisk *disk); extern void del_gendisk(struct gendisk *gp); extern void unlink_gendisk(struct gendisk *gp); extern struct gendisk *get_gendisk(dev_t dev, int *partno); +extern struct block_device *bdget_disk(struct gendisk *disk, int partno); extern void set_device_ro(struct block_device *bdev, int flag); extern void set_disk_ro(struct gendisk *disk, int flag); @@ -553,11 +573,6 @@ extern void blk_register_region(dev_t devt, unsigned long range, void *data); extern void blk_unregister_region(dev_t devt, unsigned long range); -static inline struct block_device *bdget_disk(struct gendisk *disk, int partno) -{ - return bdget(MKDEV(disk->major, disk->first_minor) + partno); -} - #else /* CONFIG_BLOCK */ static inline void printk_all_partitions(void) { } -- cgit v1.2.3 From c9959059161ddd7bf4670cf47367033d6b2f79c4 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 25 Aug 2008 19:47:21 +0900 Subject: block: fix diskstats access There are two variants of stat functions - ones prefixed with double underbars which don't care about preemption and ones without which disable preemption before manipulating per-cpu counters. It's unclear whether the underbarred ones assume that preemtion is disabled on entry as some callers don't do that. This patch unifies diskstats access by implementing disk_stat_lock() and disk_stat_unlock() which take care of both RCU (for partition access) and preemption (for per-cpu counter access). diskstats access should always be enclosed between the two functions. As such, there's no need for the versions which disables preemption. They're removed and double underbars ones are renamed to drop the underbars. As an extra argument is added, there's no danger of using the old version unconverted. disk_stat_lock() uses get_cpu() and returns the cpu index and all diskstat functions which access per-cpu counters now has @cpu argument to help RT. This change adds RCU or preemption operations at some places but also collapses several preemption ops into one at others. Overall, the performance difference should be negligible as all involved ops are very lightweight per-cpu ones. Signed-off-by: Tejun Heo Cc: Peter Zijlstra Signed-off-by: Jens Axboe --- block/blk-core.c | 52 +++++++++-------- block/blk-merge.c | 11 ++-- block/genhd.c | 20 ++++--- drivers/block/aoe/aoecmd.c | 15 ++--- drivers/md/dm.c | 26 +++++---- drivers/md/linear.c | 7 ++- drivers/md/multipath.c | 7 ++- drivers/md/raid0.c | 7 ++- drivers/md/raid1.c | 8 ++- drivers/md/raid10.c | 7 ++- drivers/md/raid5.c | 8 ++- fs/partitions/check.c | 7 ++- include/linux/genhd.h | 139 +++++++++++++++++++-------------------------- 13 files changed, 158 insertions(+), 156 deletions(-) (limited to 'drivers/md/dm.c') diff --git a/block/blk-core.c b/block/blk-core.c index d6128d9ad601..e0a5ee36849c 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -56,25 +56,26 @@ static void drive_stat_acct(struct request *rq, int new_io) { struct hd_struct *part; int rw = rq_data_dir(rq); + int cpu; if (!blk_fs_request(rq) || !rq->rq_disk) return; - rcu_read_lock(); - + cpu = disk_stat_lock(); part = disk_map_sector_rcu(rq->rq_disk, rq->sector); + if (!new_io) - __all_stat_inc(rq->rq_disk, part, merges[rw], rq->sector); + all_stat_inc(cpu, rq->rq_disk, part, merges[rw], rq->sector); else { - disk_round_stats(rq->rq_disk); + disk_round_stats(cpu, rq->rq_disk); rq->rq_disk->in_flight++; if (part) { - part_round_stats(part); + part_round_stats(cpu, part); part->in_flight++; } } - rcu_read_unlock(); + disk_stat_unlock(); } void blk_queue_congestion_threshold(struct request_queue *q) @@ -997,7 +998,7 @@ static inline void add_request(struct request_queue *q, struct request *req) * /proc/diskstats. This accounts immediately for all queue usage up to * the current jiffies and restarts the counters again. */ -void disk_round_stats(struct gendisk *disk) +void disk_round_stats(int cpu, struct gendisk *disk) { unsigned long now = jiffies; @@ -1005,15 +1006,15 @@ void disk_round_stats(struct gendisk *disk) return; if (disk->in_flight) { - __disk_stat_add(disk, time_in_queue, - disk->in_flight * (now - disk->stamp)); - __disk_stat_add(disk, io_ticks, (now - disk->stamp)); + disk_stat_add(cpu, disk, time_in_queue, + disk->in_flight * (now - disk->stamp)); + disk_stat_add(cpu, disk, io_ticks, (now - disk->stamp)); } disk->stamp = now; } EXPORT_SYMBOL_GPL(disk_round_stats); -void part_round_stats(struct hd_struct *part) +void part_round_stats(int cpu, struct hd_struct *part) { unsigned long now = jiffies; @@ -1021,9 +1022,9 @@ void part_round_stats(struct hd_struct *part) return; if (part->in_flight) { - __part_stat_add(part, time_in_queue, - part->in_flight * (now - part->stamp)); - __part_stat_add(part, io_ticks, (now - part->stamp)); + part_stat_add(cpu, part, time_in_queue, + part->in_flight * (now - part->stamp)); + part_stat_add(cpu, part, io_ticks, (now - part->stamp)); } part->stamp = now; } @@ -1563,12 +1564,13 @@ static int __end_that_request_first(struct request *req, int error, if (blk_fs_request(req) && req->rq_disk) { const int rw = rq_data_dir(req); struct hd_struct *part; + int cpu; - rcu_read_lock(); + cpu = disk_stat_lock(); part = disk_map_sector_rcu(req->rq_disk, req->sector); - all_stat_add(req->rq_disk, part, sectors[rw], - nr_bytes >> 9, req->sector); - rcu_read_unlock(); + all_stat_add(cpu, req->rq_disk, part, sectors[rw], + nr_bytes >> 9, req->sector); + disk_stat_unlock(); } total_bytes = bio_nbytes = 0; @@ -1753,21 +1755,21 @@ static void end_that_request_last(struct request *req, int error) unsigned long duration = jiffies - req->start_time; const int rw = rq_data_dir(req); struct hd_struct *part; + int cpu; - rcu_read_lock(); - + cpu = disk_stat_lock(); part = disk_map_sector_rcu(disk, req->sector); - __all_stat_inc(disk, part, ios[rw], req->sector); - __all_stat_add(disk, part, ticks[rw], duration, req->sector); - disk_round_stats(disk); + all_stat_inc(cpu, disk, part, ios[rw], req->sector); + all_stat_add(cpu, disk, part, ticks[rw], duration, req->sector); + disk_round_stats(cpu, disk); disk->in_flight--; if (part) { - part_round_stats(part); + part_round_stats(cpu, part); part->in_flight--; } - rcu_read_unlock(); + disk_stat_unlock(); } if (req->end_io) diff --git a/block/blk-merge.c b/block/blk-merge.c index eb2a3ca58303..d926a24bf1fd 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -388,18 +388,19 @@ static int attempt_merge(struct request_queue *q, struct request *req, if (req->rq_disk) { struct hd_struct *part; + int cpu; - rcu_read_lock(); - + cpu = disk_stat_lock(); part = disk_map_sector_rcu(req->rq_disk, req->sector); - disk_round_stats(req->rq_disk); + + disk_round_stats(cpu, req->rq_disk); req->rq_disk->in_flight--; if (part) { - part_round_stats(part); + part_round_stats(cpu, part); part->in_flight--; } - rcu_read_unlock(); + disk_stat_unlock(); } req->ioprio = ioprio_best(req->ioprio, next->ioprio); diff --git a/block/genhd.c b/block/genhd.c index b431d6543942..430626e440f0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -633,10 +633,11 @@ static ssize_t disk_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); + int cpu; - preempt_disable(); - disk_round_stats(disk); - preempt_enable(); + cpu = disk_stat_lock(); + disk_round_stats(cpu, disk); + disk_stat_unlock(); return sprintf(buf, "%8lu %8lu %8llu %8u " "%8lu %8lu %8llu %8u " @@ -749,6 +750,7 @@ static int diskstats_show(struct seq_file *seqf, void *v) struct disk_part_iter piter; struct hd_struct *hd; char buf[BDEVNAME_SIZE]; + int cpu; /* if (&gp->dev.kobj.entry == block_class.devices.next) @@ -758,9 +760,9 @@ static int diskstats_show(struct seq_file *seqf, void *v) "\n\n"); */ - preempt_disable(); - disk_round_stats(gp); - preempt_enable(); + cpu = disk_stat_lock(); + disk_round_stats(cpu, gp); + disk_stat_unlock(); seq_printf(seqf, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), disk_name(gp, 0, buf), @@ -777,9 +779,9 @@ static int diskstats_show(struct seq_file *seqf, void *v) /* now show all non-0 size partitions of it */ disk_part_iter_init(&piter, gp, 0); while ((hd = disk_part_iter_next(&piter))) { - preempt_disable(); - part_round_stats(hd); - preempt_enable(); + cpu = disk_stat_lock(); + part_round_stats(cpu, hd); + disk_stat_unlock(); seq_printf(seqf, "%4d %4d %s %lu %lu %llu " "%u %lu %lu %llu %u %u %u %u\n", MAJOR(part_devt(hd)), MINOR(part_devt(hd)), diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 84c03d65dcc5..17eed8c025d0 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -756,16 +756,17 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector unsigned long n_sect = bio->bi_size >> 9; const int rw = bio_data_dir(bio); struct hd_struct *part; + int cpu; - rcu_read_lock(); - + cpu = disk_stat_lock(); part = disk_map_sector_rcu(disk, sector); - all_stat_inc(disk, part, ios[rw], sector); - all_stat_add(disk, part, ticks[rw], duration, sector); - all_stat_add(disk, part, sectors[rw], n_sect, sector); - all_stat_add(disk, part, io_ticks, duration, sector); - rcu_read_unlock(); + all_stat_inc(cpu, disk, part, ios[rw], sector); + all_stat_add(cpu, disk, part, ticks[rw], duration, sector); + all_stat_add(cpu, disk, part, sectors[rw], n_sect, sector); + all_stat_add(cpu, disk, part, io_ticks, duration, sector); + + disk_stat_unlock(); } void diff --git a/drivers/md/dm.c b/drivers/md/dm.c index a78caad29996..653624792eaf 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -377,12 +377,13 @@ static void free_tio(struct mapped_device *md, struct dm_target_io *tio) static void start_io_acct(struct dm_io *io) { struct mapped_device *md = io->md; + int cpu; io->start_time = jiffies; - preempt_disable(); - disk_round_stats(dm_disk(md)); - preempt_enable(); + cpu = disk_stat_lock(); + disk_round_stats(cpu, dm_disk(md)); + disk_stat_unlock(); dm_disk(md)->in_flight = atomic_inc_return(&md->pending); } @@ -391,15 +392,15 @@ static int end_io_acct(struct dm_io *io) struct mapped_device *md = io->md; struct bio *bio = io->bio; unsigned long duration = jiffies - io->start_time; - int pending; + int pending, cpu; int rw = bio_data_dir(bio); - preempt_disable(); - disk_round_stats(dm_disk(md)); - preempt_enable(); - dm_disk(md)->in_flight = pending = atomic_dec_return(&md->pending); + cpu = disk_stat_lock(); + disk_round_stats(cpu, dm_disk(md)); + disk_stat_add(cpu, dm_disk(md), ticks[rw], duration); + disk_stat_unlock(); - disk_stat_add(dm_disk(md), ticks[rw], duration); + dm_disk(md)->in_flight = pending = atomic_dec_return(&md->pending); return !pending; } @@ -885,6 +886,7 @@ static int dm_request(struct request_queue *q, struct bio *bio) int r = -EIO; int rw = bio_data_dir(bio); struct mapped_device *md = q->queuedata; + int cpu; /* * There is no use in forwarding any barrier request since we can't @@ -897,8 +899,10 @@ static int dm_request(struct request_queue *q, struct bio *bio) down_read(&md->io_lock); - disk_stat_inc(dm_disk(md), ios[rw]); - disk_stat_add(dm_disk(md), sectors[rw], bio_sectors(bio)); + cpu = disk_stat_lock(); + disk_stat_inc(cpu, dm_disk(md), ios[rw]); + disk_stat_add(cpu, dm_disk(md), sectors[rw], bio_sectors(bio)); + disk_stat_unlock(); /* * If we're suspended we have to queue diff --git a/drivers/md/linear.c b/drivers/md/linear.c index b1eebf88c209..00cbc8e47294 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -318,14 +318,17 @@ static int linear_make_request (struct request_queue *q, struct bio *bio) mddev_t *mddev = q->queuedata; dev_info_t *tmp_dev; sector_t block; + int cpu; if (unlikely(bio_barrier(bio))) { bio_endio(bio, -EOPNOTSUPP); return 0; } - disk_stat_inc(mddev->gendisk, ios[rw]); - disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); + cpu = disk_stat_lock(); + disk_stat_inc(cpu, mddev->gendisk, ios[rw]); + disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); + disk_stat_unlock(); tmp_dev = which_dev(mddev, bio->bi_sector); block = bio->bi_sector >> 1; diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index c4779ccba1c3..182f5a94cdc5 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -147,6 +147,7 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio) struct multipath_bh * mp_bh; struct multipath_info *multipath; const int rw = bio_data_dir(bio); + int cpu; if (unlikely(bio_barrier(bio))) { bio_endio(bio, -EOPNOTSUPP); @@ -158,8 +159,10 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio) mp_bh->master_bio = bio; mp_bh->mddev = mddev; - disk_stat_inc(mddev->gendisk, ios[rw]); - disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); + cpu = disk_stat_lock(); + disk_stat_inc(cpu, mddev->gendisk, ios[rw]); + disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); + disk_stat_unlock(); mp_bh->path = multipath_map(conf); if (mp_bh->path < 0) { diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index 183610635661..e26030fa59ab 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -399,14 +399,17 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio) sector_t chunk; sector_t block, rsect; const int rw = bio_data_dir(bio); + int cpu; if (unlikely(bio_barrier(bio))) { bio_endio(bio, -EOPNOTSUPP); return 0; } - disk_stat_inc(mddev->gendisk, ios[rw]); - disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); + cpu = disk_stat_lock(); + disk_stat_inc(cpu, mddev->gendisk, ios[rw]); + disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); + disk_stat_unlock(); chunk_size = mddev->chunk_size >> 10; chunk_sects = mddev->chunk_size >> 9; diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 0b82030c265d..babb13036f93 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -779,7 +779,7 @@ static int make_request(struct request_queue *q, struct bio * bio) struct page **behind_pages = NULL; const int rw = bio_data_dir(bio); const int do_sync = bio_sync(bio); - int do_barriers; + int cpu, do_barriers; mdk_rdev_t *blocked_rdev; /* @@ -804,8 +804,10 @@ static int make_request(struct request_queue *q, struct bio * bio) bitmap = mddev->bitmap; - disk_stat_inc(mddev->gendisk, ios[rw]); - disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); + cpu = disk_stat_lock(); + disk_stat_inc(cpu, mddev->gendisk, ios[rw]); + disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); + disk_stat_unlock(); /* * make_request() can abort the operation when READA is being diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index d3b9aa096285..5ec80da0a9d7 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -789,6 +789,7 @@ static int make_request(struct request_queue *q, struct bio * bio) mirror_info_t *mirror; r10bio_t *r10_bio; struct bio *read_bio; + int cpu; int i; int chunk_sects = conf->chunk_mask + 1; const int rw = bio_data_dir(bio); @@ -843,8 +844,10 @@ static int make_request(struct request_queue *q, struct bio * bio) */ wait_barrier(conf); - disk_stat_inc(mddev->gendisk, ios[rw]); - disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); + cpu = disk_stat_lock(); + disk_stat_inc(cpu, mddev->gendisk, ios[rw]); + disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); + disk_stat_unlock(); r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 37e546528f9c..5899f211515f 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3387,7 +3387,7 @@ static int make_request(struct request_queue *q, struct bio * bi) sector_t logical_sector, last_sector; struct stripe_head *sh; const int rw = bio_data_dir(bi); - int remaining; + int cpu, remaining; if (unlikely(bio_barrier(bi))) { bio_endio(bi, -EOPNOTSUPP); @@ -3396,8 +3396,10 @@ static int make_request(struct request_queue *q, struct bio * bi) md_write_start(mddev, bi); - disk_stat_inc(mddev->gendisk, ios[rw]); - disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi)); + cpu = disk_stat_lock(); + disk_stat_inc(cpu, mddev->gendisk, ios[rw]); + disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bi)); + disk_stat_unlock(); if (rw == READ && mddev->reshape_position == MaxSector && diff --git a/fs/partitions/check.c b/fs/partitions/check.c index 96c8bf41e455..c442f0aadac3 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -219,10 +219,11 @@ static ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); + int cpu; - preempt_disable(); - part_round_stats(p); - preempt_enable(); + cpu = disk_stat_lock(); + part_round_stats(cpu, p); + disk_stat_unlock(); return sprintf(buf, "%8lu %8lu %8llu %8u " "%8lu %8lu %8llu %8u " diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 7fbba19e076b..ac8a901f2002 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -209,16 +209,24 @@ extern void disk_part_iter_exit(struct disk_part_iter *piter); extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector); -/* +/* * Macros to operate on percpu disk statistics: * - * The __ variants should only be called in critical sections. The full - * variants disable/enable preemption. + * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters + * and should be called between disk_stat_lock() and + * disk_stat_unlock(). + * + * part_stat_read() can be called at any time. + * + * part_stat_{add|set_all}() and {init|free}_part_stats are for + * internal use only. */ - #ifdef CONFIG_SMP -#define __disk_stat_add(gendiskp, field, addnd) \ - (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd) +#define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); }) +#define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) + +#define disk_stat_add(cpu, gendiskp, field, addnd) \ + (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd) #define disk_stat_read(gendiskp, field) \ ({ \ @@ -229,7 +237,8 @@ extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, res; \ }) -static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { +static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) +{ int i; for_each_possible_cpu(i) @@ -237,14 +246,14 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) { sizeof(struct disk_stats)); } -#define __part_stat_add(part, field, addnd) \ - (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd) +#define part_stat_add(cpu, part, field, addnd) \ + (per_cpu_ptr(part->dkstats, cpu)->field += addnd) -#define __all_stat_add(gendiskp, part, field, addnd, sector) \ -({ \ - if (part) \ - __part_stat_add(part, field, addnd); \ - __disk_stat_add(gendiskp, field, addnd); \ +#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \ +({ \ + if (part) \ + part_stat_add(cpu, part, field, addnd); \ + disk_stat_add(cpu, gendiskp, field, addnd); \ }) #define part_stat_read(part, field) \ @@ -264,10 +273,13 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) memset(per_cpu_ptr(part->dkstats, i), value, sizeof(struct disk_stats)); } - + #else /* !CONFIG_SMP */ -#define __disk_stat_add(gendiskp, field, addnd) \ - (gendiskp->dkstats.field += addnd) +#define disk_stat_lock() ({ rcu_read_lock(); 0; }) +#define disk_stat_unlock() rcu_read_unlock() + +#define disk_stat_add(cpu, gendiskp, field, addnd) \ + (gendiskp->dkstats.field += addnd) #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) @@ -275,14 +287,14 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); } -#define __part_stat_add(part, field, addnd) \ +#define part_stat_add(cpu, part, field, addnd) \ (part->dkstats.field += addnd) -#define __all_stat_add(gendiskp, part, field, addnd, sector) \ -({ \ - if (part) \ - part->dkstats.field += addnd; \ - __disk_stat_add(gendiskp, field, addnd); \ +#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \ +({ \ + if (part) \ + part_stat_add(cpu, part, field, addnd); \ + disk_stat_add(cpu, gendiskp, field, addnd); \ }) #define part_stat_read(part, field) (part->dkstats.field) @@ -294,63 +306,26 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) #endif /* CONFIG_SMP */ -#define disk_stat_add(gendiskp, field, addnd) \ - do { \ - preempt_disable(); \ - __disk_stat_add(gendiskp, field, addnd); \ - preempt_enable(); \ - } while (0) - -#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1) -#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1) - -#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1) -#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1) - -#define __disk_stat_sub(gendiskp, field, subnd) \ - __disk_stat_add(gendiskp, field, -subnd) -#define disk_stat_sub(gendiskp, field, subnd) \ - disk_stat_add(gendiskp, field, -subnd) - -#define part_stat_add(gendiskp, field, addnd) \ - do { \ - preempt_disable(); \ - __part_stat_add(gendiskp, field, addnd);\ - preempt_enable(); \ - } while (0) - -#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1) -#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1) - -#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1) -#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1) - -#define __part_stat_sub(gendiskp, field, subnd) \ - __part_stat_add(gendiskp, field, -subnd) -#define part_stat_sub(gendiskp, field, subnd) \ - part_stat_add(gendiskp, field, -subnd) - -#define all_stat_add(gendiskp, part, field, addnd, sector) \ - do { \ - preempt_disable(); \ - __all_stat_add(gendiskp, part, field, addnd, sector); \ - preempt_enable(); \ - } while (0) - -#define __all_stat_dec(gendiskp, field, sector) \ - __all_stat_add(gendiskp, field, -1, sector) -#define all_stat_dec(gendiskp, field, sector) \ - all_stat_add(gendiskp, field, -1, sector) - -#define __all_stat_inc(gendiskp, part, field, sector) \ - __all_stat_add(gendiskp, part, field, 1, sector) -#define all_stat_inc(gendiskp, part, field, sector) \ - all_stat_add(gendiskp, part, field, 1, sector) - -#define __all_stat_sub(gendiskp, part, field, subnd, sector) \ - __all_stat_add(gendiskp, part, field, -subnd, sector) -#define all_stat_sub(gendiskp, part, field, subnd, sector) \ - all_stat_add(gendiskp, part, field, -subnd, sector) +#define disk_stat_dec(cpu, gendiskp, field) \ + disk_stat_add(cpu, gendiskp, field, -1) +#define disk_stat_inc(cpu, gendiskp, field) \ + disk_stat_add(cpu, gendiskp, field, 1) +#define disk_stat_sub(cpu, gendiskp, field, subnd) \ + disk_stat_add(cpu, gendiskp, field, -subnd) + +#define part_stat_dec(cpu, gendiskp, field) \ + part_stat_add(cpu, gendiskp, field, -1) +#define part_stat_inc(cpu, gendiskp, field) \ + part_stat_add(cpu, gendiskp, field, 1) +#define part_stat_sub(cpu, gendiskp, field, subnd) \ + part_stat_add(cpu, gendiskp, field, -subnd) + +#define all_stat_dec(cpu, gendiskp, field, sector) \ + all_stat_add(cpu, gendiskp, field, -1, sector) +#define all_stat_inc(cpu, gendiskp, part, field, sector) \ + all_stat_add(cpu, gendiskp, part, field, 1, sector) +#define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \ + all_stat_add(cpu, gendiskp, part, field, -subnd, sector) /* Inlines to alloc and free disk stats in struct gendisk */ #ifdef CONFIG_SMP @@ -401,8 +376,8 @@ static inline void free_part_stats(struct hd_struct *part) #endif /* CONFIG_SMP */ /* drivers/block/ll_rw_blk.c */ -extern void disk_round_stats(struct gendisk *disk); -extern void part_round_stats(struct hd_struct *part); +extern void disk_round_stats(int cpu, struct gendisk *disk); +extern void part_round_stats(int cpu, struct hd_struct *part); /* drivers/block/genhd.c */ extern int get_blkdev_list(char *, int); -- cgit v1.2.3 From ed9e1982347b36573cd622ee5f4e2a7ccd79b3fd Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 25 Aug 2008 19:56:05 +0900 Subject: block: implement and use {disk|part}_to_dev() Implement {disk|part}_to_dev() and use them to access generic device instead of directly dereferencing {disk|part}->dev. To make sure no user is left behind, rename generic devices fields to __dev. This is in preparation of unifying partition 0 handling with other partitions. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- block/blk-integrity.c | 5 +-- block/blk-sysfs.c | 4 +-- block/genhd.c | 27 ++++++++-------- drivers/block/aoe/aoeblk.c | 4 +-- drivers/block/nbd.c | 4 +-- drivers/ide/ide-probe.c | 2 +- drivers/md/dm.c | 4 +-- drivers/md/md.c | 10 +++--- fs/block_dev.c | 4 +-- fs/partitions/check.c | 79 ++++++++++++++++++++++++---------------------- include/linux/genhd.h | 20 ++++++------ 11 files changed, 86 insertions(+), 77 deletions(-) (limited to 'drivers/md/dm.c') diff --git a/block/blk-integrity.c b/block/blk-integrity.c index d87606eaca1d..69023da63151 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -331,7 +331,8 @@ int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template) return -1; if (kobject_init_and_add(&bi->kobj, &integrity_ktype, - &disk->dev.kobj, "%s", "integrity")) { + &disk_to_dev(disk)->kobj, + "%s", "integrity")) { kmem_cache_free(integrity_cachep, bi); return -1; } @@ -375,7 +376,7 @@ void blk_integrity_unregister(struct gendisk *disk) kobject_uevent(&bi->kobj, KOBJ_REMOVE); kobject_del(&bi->kobj); - kobject_put(&disk->dev.kobj); + kobject_put(&disk_to_dev(disk)->kobj); kmem_cache_free(integrity_cachep, bi); } EXPORT_SYMBOL(blk_integrity_unregister); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 304ec73ab821..b9a6ed166649 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -310,7 +310,7 @@ int blk_register_queue(struct gendisk *disk) if (!q->request_fn) return 0; - ret = kobject_add(&q->kobj, kobject_get(&disk->dev.kobj), + ret = kobject_add(&q->kobj, kobject_get(&disk_to_dev(disk)->kobj), "%s", "queue"); if (ret < 0) return ret; @@ -339,6 +339,6 @@ void blk_unregister_queue(struct gendisk *disk) kobject_uevent(&q->kobj, KOBJ_REMOVE); kobject_del(&q->kobj); - kobject_put(&disk->dev.kobj); + kobject_put(&disk_to_dev(disk)->kobj); } } diff --git a/block/genhd.c b/block/genhd.c index 67e5a59ced2a..0a2f16bd54b7 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -59,7 +59,7 @@ struct hd_struct *disk_get_part(struct gendisk *disk, int partno) rcu_read_lock(); part = rcu_dereference(disk->__part[partno - 1]); if (part) - get_device(&part->dev); + get_device(part_to_dev(part)); rcu_read_unlock(); return part; @@ -130,7 +130,7 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) continue; - get_device(&part->dev); + get_device(part_to_dev(part)); piter->part = part; piter->idx += inc; break; @@ -435,7 +435,7 @@ static struct kobject *exact_match(dev_t devt, int *partno, void *data) { struct gendisk *p = data; - return &p->dev.kobj; + return &disk_to_dev(p)->kobj; } static int exact_lock(dev_t devt, void *data) @@ -460,7 +460,7 @@ void add_disk(struct gendisk *disk) int retval; disk->flags |= GENHD_FL_UP; - disk->dev.devt = MKDEV(disk->major, disk->first_minor); + disk_to_dev(disk)->devt = MKDEV(disk->major, disk->first_minor); blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); register_disk(disk); @@ -468,7 +468,8 @@ void add_disk(struct gendisk *disk) bdi = &disk->queue->backing_dev_info; bdi_register_dev(bdi, disk_devt(disk)); - retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); + retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, + "bdi"); WARN_ON(retval); } @@ -477,7 +478,7 @@ EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ void unlink_gendisk(struct gendisk *disk) { - sysfs_remove_link(&disk->dev.kobj, "bdi"); + sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); bdi_unregister(&disk->queue->backing_dev_info); blk_unregister_queue(disk); blk_unregister_region(disk_devt(disk), disk->minors); @@ -903,7 +904,7 @@ static int diskstats_show(struct seq_file *seqf, void *v) int cpu; /* - if (&gp->dev.kobj.entry == block_class.devices.next) + if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) seq_puts(seqf, "major minor name" " rio rmerge rsect ruse wio wmerge " "wsect wuse running use aveq" @@ -972,7 +973,7 @@ static void media_change_notify_thread(struct work_struct *work) * set enviroment vars to indicate which event this is for * so that user space will know to go check the media status. */ - kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp); + kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); put_device(gd->driverfs_dev); } @@ -1062,9 +1063,9 @@ struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id) disk->minors = minors; disk->ext_minors = ext_minors; rand_initialize_disk(disk); - disk->dev.class = &block_class; - disk->dev.type = &disk_type; - device_initialize(&disk->dev); + disk_to_dev(disk)->class = &block_class; + disk_to_dev(disk)->type = &disk_type; + device_initialize(disk_to_dev(disk)); INIT_WORK(&disk->async_notify, media_change_notify_thread); } @@ -1086,7 +1087,7 @@ struct kobject *get_disk(struct gendisk *disk) owner = disk->fops->owner; if (owner && !try_module_get(owner)) return NULL; - kobj = kobject_get(&disk->dev.kobj); + kobj = kobject_get(&disk_to_dev(disk)->kobj); if (kobj == NULL) { module_put(owner); return NULL; @@ -1100,7 +1101,7 @@ EXPORT_SYMBOL(get_disk); void put_disk(struct gendisk *disk) { if (disk) - kobject_put(&disk->dev.kobj); + kobject_put(&disk_to_dev(disk)->kobj); } EXPORT_SYMBOL(put_disk); diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c index 0c39782b2660..3edb6cb7d68f 100644 --- a/drivers/block/aoe/aoeblk.c +++ b/drivers/block/aoe/aoeblk.c @@ -109,12 +109,12 @@ static const struct attribute_group attr_group = { static int aoedisk_add_sysfs(struct aoedev *d) { - return sysfs_create_group(&d->gd->dev.kobj, &attr_group); + return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group); } void aoedisk_rm_sysfs(struct aoedev *d) { - sysfs_remove_group(&d->gd->dev.kobj, &attr_group); + sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group); } static int diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 1778e4a2c672..7b3351260d56 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -403,7 +403,7 @@ static int nbd_do_it(struct nbd_device *lo) BUG_ON(lo->magic != LO_MAGIC); lo->pid = current->pid; - ret = sysfs_create_file(&lo->disk->dev.kobj, &pid_attr.attr); + ret = sysfs_create_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr); if (ret) { printk(KERN_ERR "nbd: sysfs_create_file failed!"); return ret; @@ -412,7 +412,7 @@ static int nbd_do_it(struct nbd_device *lo) while ((req = nbd_read_stat(lo)) != NULL) nbd_end_request(req); - sysfs_remove_file(&lo->disk->dev.kobj, &pid_attr.attr); + sysfs_remove_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr); return 0; } diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c index a51a30e9eab3..70aa86c8807e 100644 --- a/drivers/ide/ide-probe.c +++ b/drivers/ide/ide-probe.c @@ -1188,7 +1188,7 @@ static struct kobject *exact_match(dev_t dev, int *part, void *data) { struct gendisk *p = data; *part &= (1 << PARTN_BITS) - 1; - return &p->dev.kobj; + return &disk_to_dev(p)->kobj; } static int exact_lock(dev_t dev, void *data) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 653624792eaf..637806695bb9 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1186,7 +1186,7 @@ static void event_callback(void *context) list_splice_init(&md->uevent_list, &uevents); spin_unlock_irqrestore(&md->uevent_lock, flags); - dm_send_uevents(&uevents, &md->disk->dev.kobj); + dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj); atomic_inc(&md->event_nr); wake_up(&md->eventq); @@ -1643,7 +1643,7 @@ out: *---------------------------------------------------------------*/ void dm_kobject_uevent(struct mapped_device *md) { - kobject_uevent(&md->disk->dev.kobj, KOBJ_CHANGE); + kobject_uevent(&disk_to_dev(md->disk)->kobj, KOBJ_CHANGE); } uint32_t dm_next_uevent_seq(struct mapped_device *md) diff --git a/drivers/md/md.c b/drivers/md/md.c index deeac4b44173..96e9fccd2eab 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1465,9 +1465,9 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) goto fail; if (rdev->bdev->bd_part) - ko = &rdev->bdev->bd_part->dev.kobj; + ko = &part_to_dev(rdev->bdev->bd_part)->kobj; else - ko = &rdev->bdev->bd_disk->dev.kobj; + ko = &disk_to_dev(rdev->bdev->bd_disk)->kobj; if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { kobject_del(&rdev->kobj); goto fail; @@ -3470,8 +3470,8 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data) disk->queue = mddev->queue; add_disk(disk); mddev->gendisk = disk; - error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj, - "%s", "md"); + error = kobject_init_and_add(&mddev->kobj, &md_ktype, + &disk_to_dev(disk)->kobj, "%s", "md"); mutex_unlock(&disks_mutex); if (error) printk(KERN_WARNING "md: cannot register %s/md - name in use\n", @@ -3761,7 +3761,7 @@ static int do_md_run(mddev_t * mddev) sysfs_notify(&mddev->kobj, NULL, "array_state"); sysfs_notify(&mddev->kobj, NULL, "sync_action"); sysfs_notify(&mddev->kobj, NULL, "degraded"); - kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE); + kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); return 0; } diff --git a/fs/block_dev.c b/fs/block_dev.c index 2f2873b9a041..a02df22f37c3 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -543,9 +543,9 @@ EXPORT_SYMBOL(bd_release); static struct kobject *bdev_get_kobj(struct block_device *bdev) { if (bdev->bd_contains != bdev) - return kobject_get(&bdev->bd_part->dev.kobj); + return kobject_get(&part_to_dev(bdev->bd_part)->kobj); else - return kobject_get(&bdev->bd_disk->dev.kobj); + return kobject_get(&disk_to_dev(bdev->bd_disk)->kobj); } static struct kobject *bdev_get_holder(struct block_device *bdev) diff --git a/fs/partitions/check.c b/fs/partitions/check.c index 0d4b7f28f13f..ac0df3acdcda 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -309,7 +309,7 @@ static inline void disk_sysfs_add_subdirs(struct gendisk *disk) { struct kobject *k; - k = kobject_get(&disk->dev.kobj); + k = kobject_get(&disk_to_dev(disk)->kobj); disk->holder_dir = kobject_create_and_add("holders", k); disk->slave_dir = kobject_create_and_add("slaves", k); kobject_put(k); @@ -322,7 +322,7 @@ static void delete_partition_rcu_cb(struct rcu_head *head) part->start_sect = 0; part->nr_sects = 0; part_stat_set_all(part, 0); - put_device(&part->dev); + put_device(part_to_dev(part)); } void delete_partition(struct gendisk *disk, int partno) @@ -336,7 +336,7 @@ void delete_partition(struct gendisk *disk, int partno) blk_free_devt(part_devt(part)); rcu_assign_pointer(disk->__part[partno-1], NULL); kobject_put(part->holder_dir); - device_del(&part->dev); + device_del(part_to_dev(part)); call_rcu(&part->rcu_head, delete_partition_rcu_cb); } @@ -354,6 +354,9 @@ int add_partition(struct gendisk *disk, int partno, { struct hd_struct *p; dev_t devt = MKDEV(0, 0); + struct device *ddev = disk_to_dev(disk); + struct device *pdev; + const char *dname; int err; if (disk->__part[partno - 1]) @@ -367,42 +370,43 @@ int add_partition(struct gendisk *disk, int partno, err = -ENOMEM; goto out_free; } + pdev = part_to_dev(p); + p->start_sect = start; p->nr_sects = len; p->partno = partno; p->policy = disk->policy; - if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1])) - snprintf(p->dev.bus_id, BUS_ID_SIZE, - "%sp%d", disk->dev.bus_id, partno); + dname = dev_name(ddev); + if (isdigit(dname[strlen(dname) - 1])) + snprintf(pdev->bus_id, BUS_ID_SIZE, "%sp%d", dname, partno); else - snprintf(p->dev.bus_id, BUS_ID_SIZE, - "%s%d", disk->dev.bus_id, partno); + snprintf(pdev->bus_id, BUS_ID_SIZE, "%s%d", dname, partno); - device_initialize(&p->dev); - p->dev.class = &block_class; - p->dev.type = &part_type; - p->dev.parent = &disk->dev; + device_initialize(pdev); + pdev->class = &block_class; + pdev->type = &part_type; + pdev->parent = ddev; err = blk_alloc_devt(p, &devt); if (err) - goto out_put; - p->dev.devt = devt; + goto out_free; + pdev->devt = devt; /* delay uevent until 'holders' subdir is created */ - p->dev.uevent_suppress = 1; - err = device_add(&p->dev); + pdev->uevent_suppress = 1; + err = device_add(pdev); if (err) goto out_put; err = -ENOMEM; - p->holder_dir = kobject_create_and_add("holders", &p->dev.kobj); + p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); if (!p->holder_dir) goto out_del; - p->dev.uevent_suppress = 0; + pdev->uevent_suppress = 0; if (flags & ADDPART_FLAG_WHOLEDISK) { - err = device_create_file(&p->dev, &dev_attr_whole_disk); + err = device_create_file(pdev, &dev_attr_whole_disk); if (err) goto out_del; } @@ -412,8 +416,8 @@ int add_partition(struct gendisk *disk, int partno, rcu_assign_pointer(disk->__part[partno - 1], p); /* suppress uevent if the disk supresses it */ - if (!disk->dev.uevent_suppress) - kobject_uevent(&p->dev.kobj, KOBJ_ADD); + if (!ddev->uevent_suppress) + kobject_uevent(&pdev->kobj, KOBJ_ADD); return 0; @@ -422,9 +426,9 @@ out_free: return err; out_del: kobject_put(p->holder_dir); - device_del(&p->dev); + device_del(pdev); out_put: - put_device(&p->dev); + put_device(pdev); blk_free_devt(devt); return err; } @@ -432,30 +436,31 @@ out_put: /* 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; char *s; int err; - disk->dev.parent = disk->driverfs_dev; + ddev->parent = disk->driverfs_dev; - strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE); + strlcpy(ddev->bus_id, disk->disk_name, BUS_ID_SIZE); /* ewww... some of these buggers have / in the name... */ - s = strchr(disk->dev.bus_id, '/'); + s = strchr(ddev->bus_id, '/'); if (s) *s = '!'; /* delay uevents, until we scanned partition table */ - disk->dev.uevent_suppress = 1; + ddev->uevent_suppress = 1; - if (device_add(&disk->dev)) + if (device_add(ddev)) return; #ifndef CONFIG_SYSFS_DEPRECATED - err = sysfs_create_link(block_depr, &disk->dev.kobj, - kobject_name(&disk->dev.kobj)); + err = sysfs_create_link(block_depr, &ddev->kobj, + kobject_name(&ddev->kobj)); if (err) { - device_del(&disk->dev); + device_del(ddev); return; } #endif @@ -481,13 +486,13 @@ void register_disk(struct gendisk *disk) exit: /* announce disk after possible partitions are created */ - disk->dev.uevent_suppress = 0; - kobject_uevent(&disk->dev.kobj, KOBJ_ADD); + ddev->uevent_suppress = 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->dev.kobj, KOBJ_ADD); + kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); disk_part_iter_exit(&piter); } @@ -518,7 +523,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev) return -EIO; /* tell userspace that the media / partition table may have changed */ - kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE); + kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); for (p = 1; p < state->limit; p++) { sector_t size = state->parts[p].size; @@ -591,7 +596,7 @@ void del_gendisk(struct gendisk *disk) kobject_put(disk->slave_dir); disk->driverfs_dev = NULL; #ifndef CONFIG_SYSFS_DEPRECATED - sysfs_remove_link(block_depr, disk->dev.bus_id); + sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); #endif - device_del(&disk->dev); + device_del(disk_to_dev(disk)); } diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 6fc532424062..e4e18c509ac5 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -15,9 +15,11 @@ #ifdef CONFIG_BLOCK -#define kobj_to_dev(k) container_of(k, struct device, kobj) -#define dev_to_disk(device) container_of(device, struct gendisk, dev) -#define dev_to_part(device) container_of(device, struct hd_struct, dev) +#define kobj_to_dev(k) container_of((k), struct device, kobj) +#define dev_to_disk(device) container_of((device), struct gendisk, __dev) +#define dev_to_part(device) container_of((device), struct hd_struct, __dev) +#define disk_to_dev(disk) (&((disk)->__dev)) +#define part_to_dev(part) (&((part)->__dev)) extern struct device_type part_type; extern struct kobject *block_depr; @@ -88,7 +90,7 @@ struct disk_stats { struct hd_struct { sector_t start_sect; sector_t nr_sects; - struct device dev; + struct device __dev; struct kobject *holder_dir; int policy, partno; #ifdef CONFIG_FAIL_MAKE_REQUEST @@ -139,7 +141,7 @@ struct gendisk { int flags; struct device *driverfs_dev; // FIXME: remove - struct device dev; + struct device __dev; struct kobject *holder_dir; struct kobject *slave_dir; @@ -163,7 +165,7 @@ struct gendisk { static inline struct gendisk *part_to_disk(struct hd_struct *part) { if (likely(part)) - return dev_to_disk((part)->dev.parent); + return dev_to_disk(part_to_dev(part)->parent); return NULL; } @@ -174,12 +176,12 @@ static inline int disk_max_parts(struct gendisk *disk) static inline dev_t disk_devt(struct gendisk *disk) { - return disk->dev.devt; + return disk_to_dev(disk)->devt; } static inline dev_t part_devt(struct hd_struct *part) { - return part->dev.devt; + return part_to_dev(part)->devt; } extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); @@ -187,7 +189,7 @@ extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); static inline void disk_put_part(struct hd_struct *part) { if (likely(part)) - put_device(&part->dev); + put_device(part_to_dev(part)); } /* -- cgit v1.2.3 From 074a7aca7afa6f230104e8e65eba3420263714a5 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 25 Aug 2008 19:56:14 +0900 Subject: block: move stats from disk to part0 Move stats related fields - stamp, in_flight, dkstats - from disk to part0 and unify stat handling such that... * part_stat_*() now updates part0 together if the specified partition is not part0. ie. part_stat_*() are now essentially all_stat_*(). * {disk|all}_stat_*() are gone. * part_round_stats() is updated similary. It handles part0 stats automatically and disk_round_stats() is killed. * part_{inc|dec}_in_fligh() is implemented which automatically updates part0 stats for parts other than part0. * disk_map_sector_rcu() is updated to return part0 if no part matches. Combined with the above changes, this makes NULL special case handling in callers unnecessary. * Separate stats show code paths for disk are collapsed into part stats show code paths. * Rename disk_stat_lock/unlock() to part_stat_lock/unlock() While at it, reposition stat handling macros a bit and add missing parentheses around macro parameters. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- block/blk-core.c | 84 ++++++++++-------------- block/blk-merge.c | 12 ++-- block/genhd.c | 97 +++++++-------------------- drivers/block/aoe/aoecmd.c | 12 ++-- drivers/md/dm.c | 27 ++++---- drivers/md/linear.c | 9 +-- drivers/md/md.c | 4 +- drivers/md/multipath.c | 9 +-- drivers/md/raid0.c | 9 +-- drivers/md/raid1.c | 9 +-- drivers/md/raid10.c | 9 +-- drivers/md/raid5.c | 9 +-- fs/partitions/check.c | 12 ++-- include/linux/genhd.h | 159 +++++++++++++-------------------------------- 14 files changed, 165 insertions(+), 296 deletions(-) (limited to 'drivers/md/dm.c') diff --git a/block/blk-core.c b/block/blk-core.c index 505ec61067df..98138f002524 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -61,21 +61,17 @@ static void drive_stat_acct(struct request *rq, int new_io) if (!blk_fs_request(rq) || !rq->rq_disk) return; - cpu = disk_stat_lock(); + cpu = part_stat_lock(); part = disk_map_sector_rcu(rq->rq_disk, rq->sector); if (!new_io) - all_stat_inc(cpu, rq->rq_disk, part, merges[rw], rq->sector); + part_stat_inc(cpu, part, merges[rw]); else { - disk_round_stats(cpu, rq->rq_disk); - rq->rq_disk->in_flight++; - if (part) { - part_round_stats(cpu, part); - part->in_flight++; - } + part_round_stats(cpu, part); + part_inc_in_flight(part); } - disk_stat_unlock(); + part_stat_unlock(); } void blk_queue_congestion_threshold(struct request_queue *q) @@ -983,8 +979,22 @@ static inline void add_request(struct request_queue *q, struct request *req) __elv_add_request(q, req, ELEVATOR_INSERT_SORT, 0); } -/* - * disk_round_stats() - Round off the performance stats on a struct +static void part_round_stats_single(int cpu, struct hd_struct *part, + unsigned long now) +{ + if (now == part->stamp) + return; + + if (part->in_flight) { + __part_stat_add(cpu, part, time_in_queue, + part->in_flight * (now - part->stamp)); + __part_stat_add(cpu, part, io_ticks, (now - part->stamp)); + } + part->stamp = now; +} + +/** + * part_round_stats() - Round off the performance stats on a struct * disk_stats. * * The average IO queue length and utilisation statistics are maintained @@ -998,36 +1008,15 @@ static inline void add_request(struct request_queue *q, struct request *req) * /proc/diskstats. This accounts immediately for all queue usage up to * the current jiffies and restarts the counters again. */ -void disk_round_stats(int cpu, struct gendisk *disk) -{ - unsigned long now = jiffies; - - if (now == disk->stamp) - return; - - if (disk->in_flight) { - disk_stat_add(cpu, disk, time_in_queue, - disk->in_flight * (now - disk->stamp)); - disk_stat_add(cpu, disk, io_ticks, (now - disk->stamp)); - } - disk->stamp = now; -} -EXPORT_SYMBOL_GPL(disk_round_stats); - void part_round_stats(int cpu, struct hd_struct *part) { unsigned long now = jiffies; - if (now == part->stamp) - return; - - if (part->in_flight) { - part_stat_add(cpu, part, time_in_queue, - part->in_flight * (now - part->stamp)); - part_stat_add(cpu, part, io_ticks, (now - part->stamp)); - } - part->stamp = now; + if (part->partno) + part_round_stats_single(cpu, &part_to_disk(part)->part0, now); + part_round_stats_single(cpu, part, now); } +EXPORT_SYMBOL_GPL(part_round_stats); /* * queue lock must be held @@ -1567,11 +1556,10 @@ static int __end_that_request_first(struct request *req, int error, struct hd_struct *part; int cpu; - cpu = disk_stat_lock(); + cpu = part_stat_lock(); part = disk_map_sector_rcu(req->rq_disk, req->sector); - all_stat_add(cpu, req->rq_disk, part, sectors[rw], - nr_bytes >> 9, req->sector); - disk_stat_unlock(); + part_stat_add(cpu, part, sectors[rw], nr_bytes >> 9); + part_stat_unlock(); } total_bytes = bio_nbytes = 0; @@ -1758,19 +1746,15 @@ static void end_that_request_last(struct request *req, int error) struct hd_struct *part; int cpu; - cpu = disk_stat_lock(); + cpu = part_stat_lock(); part = disk_map_sector_rcu(disk, req->sector); - all_stat_inc(cpu, disk, part, ios[rw], req->sector); - all_stat_add(cpu, disk, part, ticks[rw], duration, req->sector); - disk_round_stats(cpu, disk); - disk->in_flight--; - if (part) { - part_round_stats(cpu, part); - part->in_flight--; - } + part_stat_inc(cpu, part, ios[rw]); + part_stat_add(cpu, part, ticks[rw], duration); + part_round_stats(cpu, part); + part_dec_in_flight(part); - disk_stat_unlock(); + part_stat_unlock(); } if (req->end_io) diff --git a/block/blk-merge.c b/block/blk-merge.c index d926a24bf1fd..c77196d55899 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -390,17 +390,13 @@ static int attempt_merge(struct request_queue *q, struct request *req, struct hd_struct *part; int cpu; - cpu = disk_stat_lock(); + cpu = part_stat_lock(); part = disk_map_sector_rcu(req->rq_disk, req->sector); - disk_round_stats(cpu, req->rq_disk); - req->rq_disk->in_flight--; - if (part) { - part_round_stats(cpu, part); - part->in_flight--; - } + part_round_stats(cpu, part); + part_dec_in_flight(part); - disk_stat_unlock(); + part_stat_unlock(); } req->ioprio = ioprio_best(req->ioprio, next->ioprio); diff --git a/block/genhd.c b/block/genhd.c index 06a252f2b967..e1cb96fb883e 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -176,7 +176,7 @@ EXPORT_SYMBOL_GPL(disk_part_iter_exit); * while preemption is disabled. * * RETURNS: - * Found partition on success, NULL if there's no matching partition. + * Found partition on success, part0 is returned if no partition matches */ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) { @@ -189,7 +189,7 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) sector < part->start_sect + part->nr_sects) return part; } - return NULL; + return &disk->part0; } EXPORT_SYMBOL_GPL(disk_map_sector_rcu); @@ -580,24 +580,24 @@ void __init printk_all_partitions(void) * numbers in hex - the same format as the root= * option takes. */ - printk("%s %10llu %s", - bdevt_str(disk_devt(disk), devt_buf), - (unsigned long long)get_capacity(disk) >> 1, - disk_name(disk, 0, name_buf)); - if (disk->driverfs_dev != NULL && - disk->driverfs_dev->driver != NULL) - printk(" driver: %s\n", - disk->driverfs_dev->driver->name); - else - printk(" (driver?)\n"); + disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); + while ((part = disk_part_iter_next(&piter))) { + bool is_part0 = part == &disk->part0; - /* now show the partitions */ - disk_part_iter_init(&piter, disk, 0); - while ((part = disk_part_iter_next(&piter))) - printk(" %s %10llu %s\n", + printk("%s%s %10llu %s", is_part0 ? "" : " ", bdevt_str(part_devt(part), devt_buf), (unsigned long long)part->nr_sects >> 1, disk_name(disk, part->partno, name_buf)); + if (is_part0) { + if (disk->driverfs_dev != NULL && + disk->driverfs_dev->driver != NULL) + printk(" driver: %s\n", + disk->driverfs_dev->driver->name); + else + printk(" (driver?)\n"); + } else + printk("\n"); + } disk_part_iter_exit(&piter); } class_dev_iter_exit(&iter); @@ -674,12 +674,7 @@ static int show_partition(struct seq_file *seqf, void *v) return 0; /* show the full disk and all non-0 size partitions of it */ - seq_printf(seqf, "%4d %7d %10llu %s\n", - MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)), - (unsigned long long)get_capacity(sgp) >> 1, - disk_name(sgp, 0, buf)); - - disk_part_iter_init(&piter, sgp, 0); + disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) seq_printf(seqf, "%4d %7d %10llu %s\n", MAJOR(part_devt(part)), MINOR(part_devt(part)), @@ -768,40 +763,13 @@ static ssize_t disk_capability_show(struct device *dev, return sprintf(buf, "%x\n", disk->flags); } -static ssize_t disk_stat_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - int cpu; - - cpu = disk_stat_lock(); - disk_round_stats(cpu, disk); - disk_stat_unlock(); - return sprintf(buf, - "%8lu %8lu %8llu %8u " - "%8lu %8lu %8llu %8u " - "%8u %8u %8u" - "\n", - disk_stat_read(disk, ios[READ]), - disk_stat_read(disk, merges[READ]), - (unsigned long long)disk_stat_read(disk, sectors[READ]), - jiffies_to_msecs(disk_stat_read(disk, ticks[READ])), - disk_stat_read(disk, ios[WRITE]), - disk_stat_read(disk, merges[WRITE]), - (unsigned long long)disk_stat_read(disk, sectors[WRITE]), - jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])), - disk->in_flight, - jiffies_to_msecs(disk_stat_read(disk, io_ticks)), - jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); -} - 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(ro, S_IRUGO, disk_ro_show, NULL); static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); -static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL); +static DEVICE_ATTR(stat, S_IRUGO, part_stat_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); @@ -836,7 +804,7 @@ static void disk_release(struct device *dev) kfree(disk->random); kfree(disk->__part); - free_disk_stats(disk); + free_part_stats(&disk->part0); kfree(disk); } struct class block_class = { @@ -873,28 +841,11 @@ static int diskstats_show(struct seq_file *seqf, void *v) "\n\n"); */ - cpu = disk_stat_lock(); - disk_round_stats(cpu, gp); - disk_stat_unlock(); - seq_printf(seqf, "%4d %7d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n", - MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)), - disk_name(gp, 0, buf), - disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), - (unsigned long long)disk_stat_read(gp, sectors[0]), - jiffies_to_msecs(disk_stat_read(gp, ticks[0])), - disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), - (unsigned long long)disk_stat_read(gp, sectors[1]), - jiffies_to_msecs(disk_stat_read(gp, ticks[1])), - gp->in_flight, - jiffies_to_msecs(disk_stat_read(gp, io_ticks)), - jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); - - /* now show all non-0 size partitions of it */ - disk_part_iter_init(&piter, gp, 0); + disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0); while ((hd = disk_part_iter_next(&piter))) { - cpu = disk_stat_lock(); + cpu = part_stat_lock(); part_round_stats(cpu, hd); - disk_stat_unlock(); + part_stat_unlock(); seq_printf(seqf, "%4d %7d %s %lu %lu %llu " "%u %lu %lu %llu %u %u %u %u\n", MAJOR(part_devt(hd)), MINOR(part_devt(hd)), @@ -1000,7 +951,7 @@ struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id) int tot_minors = minors + ext_minors; int size = tot_minors * sizeof(struct hd_struct *); - if (!init_disk_stats(disk)) { + if (!init_part_stats(&disk->part0)) { kfree(disk); return NULL; } @@ -1008,7 +959,7 @@ struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id) disk->__part = kmalloc_node(size, GFP_KERNEL | __GFP_ZERO, node_id); if (!disk->__part) { - free_disk_stats(disk); + free_part_stats(&disk->part0); kfree(disk); return NULL; } diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 934800f979c9..961d29a53cab 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -758,15 +758,15 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector struct hd_struct *part; int cpu; - cpu = disk_stat_lock(); + cpu = part_stat_lock(); part = disk_map_sector_rcu(disk, sector); - all_stat_inc(cpu, disk, part, ios[rw], sector); - all_stat_add(cpu, disk, part, ticks[rw], duration, sector); - all_stat_add(cpu, disk, part, sectors[rw], n_sect, sector); - all_stat_add(cpu, disk, part, io_ticks, duration, sector); + part_stat_inc(cpu, part, ios[rw]); + part_stat_add(cpu, part, ticks[rw], duration); + part_stat_add(cpu, part, sectors[rw], n_sect); + part_stat_add(cpu, part, io_ticks, duration); - disk_stat_unlock(); + part_stat_unlock(); } void diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 637806695bb9..327de03a5bdf 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -381,10 +381,10 @@ static void start_io_acct(struct dm_io *io) io->start_time = jiffies; - cpu = disk_stat_lock(); - disk_round_stats(cpu, dm_disk(md)); - disk_stat_unlock(); - dm_disk(md)->in_flight = atomic_inc_return(&md->pending); + cpu = part_stat_lock(); + part_round_stats(cpu, &dm_disk(md)->part0); + part_stat_unlock(); + dm_disk(md)->part0.in_flight = atomic_inc_return(&md->pending); } static int end_io_acct(struct dm_io *io) @@ -395,12 +395,13 @@ static int end_io_acct(struct dm_io *io) int pending, cpu; int rw = bio_data_dir(bio); - cpu = disk_stat_lock(); - disk_round_stats(cpu, dm_disk(md)); - disk_stat_add(cpu, dm_disk(md), ticks[rw], duration); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_round_stats(cpu, &dm_disk(md)->part0); + part_stat_add(cpu, &dm_disk(md)->part0, ticks[rw], duration); + part_stat_unlock(); - dm_disk(md)->in_flight = pending = atomic_dec_return(&md->pending); + dm_disk(md)->part0.in_flight = pending = + atomic_dec_return(&md->pending); return !pending; } @@ -899,10 +900,10 @@ static int dm_request(struct request_queue *q, struct bio *bio) down_read(&md->io_lock); - cpu = disk_stat_lock(); - disk_stat_inc(cpu, dm_disk(md), ios[rw]); - disk_stat_add(cpu, dm_disk(md), sectors[rw], bio_sectors(bio)); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_stat_inc(cpu, &dm_disk(md)->part0, ios[rw]); + part_stat_add(cpu, &dm_disk(md)->part0, sectors[rw], bio_sectors(bio)); + part_stat_unlock(); /* * If we're suspended we have to queue diff --git a/drivers/md/linear.c b/drivers/md/linear.c index 00cbc8e47294..c80ea90593d3 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -325,10 +325,11 @@ static int linear_make_request (struct request_queue *q, struct bio *bio) return 0; } - cpu = disk_stat_lock(); - disk_stat_inc(cpu, mddev->gendisk, ios[rw]); - disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); + part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], + bio_sectors(bio)); + part_stat_unlock(); tmp_dev = which_dev(mddev, bio->bi_sector); block = bio->bi_sector >> 1; diff --git a/drivers/md/md.c b/drivers/md/md.c index 2bd9cf416123..0a3a4bdcd4af 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5546,8 +5546,8 @@ static int is_mddev_idle(mddev_t *mddev) rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; - curr_events = disk_stat_read(disk, sectors[0]) + - disk_stat_read(disk, sectors[1]) - + curr_events = part_stat_read(&disk->part0, sectors[0]) + + part_stat_read(&disk->part0, sectors[1]) - atomic_read(&disk->sync_io); /* sync IO will cause sync_io to increase before the disk_stats * as sync_io is counted when a request starts, and diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index 182f5a94cdc5..8bb8794129b3 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -159,10 +159,11 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio) mp_bh->master_bio = bio; mp_bh->mddev = mddev; - cpu = disk_stat_lock(); - disk_stat_inc(cpu, mddev->gendisk, ios[rw]); - disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); + part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], + bio_sectors(bio)); + part_stat_unlock(); mp_bh->path = multipath_map(conf); if (mp_bh->path < 0) { diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index e26030fa59ab..f52f442a735f 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -406,10 +406,11 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio) return 0; } - cpu = disk_stat_lock(); - disk_stat_inc(cpu, mddev->gendisk, ios[rw]); - disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); + part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], + bio_sectors(bio)); + part_stat_unlock(); chunk_size = mddev->chunk_size >> 10; chunk_sects = mddev->chunk_size >> 9; diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index babb13036f93..b9764429d856 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -804,10 +804,11 @@ static int make_request(struct request_queue *q, struct bio * bio) bitmap = mddev->bitmap; - cpu = disk_stat_lock(); - disk_stat_inc(cpu, mddev->gendisk, ios[rw]); - disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); + part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], + bio_sectors(bio)); + part_stat_unlock(); /* * make_request() can abort the operation when READA is being diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 5ec80da0a9d7..5f990133f5ef 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -844,10 +844,11 @@ static int make_request(struct request_queue *q, struct bio * bio) */ wait_barrier(conf); - cpu = disk_stat_lock(); - disk_stat_inc(cpu, mddev->gendisk, ios[rw]); - disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio)); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); + part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], + bio_sectors(bio)); + part_stat_unlock(); r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 5899f211515f..ae16794bef20 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3396,10 +3396,11 @@ static int make_request(struct request_queue *q, struct bio * bi) md_write_start(mddev, bi); - cpu = disk_stat_lock(); - disk_stat_inc(cpu, mddev->gendisk, ios[rw]); - disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bi)); - disk_stat_unlock(); + cpu = part_stat_lock(); + part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); + part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], + bio_sectors(bi)); + part_stat_unlock(); if (rw == READ && mddev->reshape_position == MaxSector && diff --git a/fs/partitions/check.c b/fs/partitions/check.c index 60592d9f43b6..f517869e8d10 100644 --- a/fs/partitions/check.c +++ b/fs/partitions/check.c @@ -210,15 +210,15 @@ ssize_t part_size_show(struct device *dev, return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); } -static ssize_t part_stat_show(struct device *dev, - struct device_attribute *attr, char *buf) +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 = disk_stat_lock(); + cpu = part_stat_lock(); part_round_stats(cpu, p); - disk_stat_unlock(); + part_stat_unlock(); return sprintf(buf, "%8lu %8lu %8llu %8u " "%8lu %8lu %8llu %8u " @@ -575,8 +575,8 @@ void del_gendisk(struct gendisk *disk) set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; unlink_gendisk(disk); - disk_stat_set_all(disk, 0); - disk->stamp = 0; + part_stat_set_all(&disk->part0, 0); + disk->part0.stamp = 0; kobject_put(disk->part0.holder_dir); kobject_put(disk->slave_dir); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 3d15b42dc352..c90e1b4fbe5a 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -145,13 +145,6 @@ struct gendisk { struct timer_rand_state *random; atomic_t sync_io; /* RAID */ - unsigned long stamp; - int in_flight; -#ifdef CONFIG_SMP - struct disk_stats *dkstats; -#else - struct disk_stats dkstats; -#endif struct work_struct async_notify; #ifdef CONFIG_BLK_DEV_INTEGRITY struct blk_integrity *integrity; @@ -232,46 +225,18 @@ extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, * internal use only. */ #ifdef CONFIG_SMP -#define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); }) -#define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) - -#define disk_stat_add(cpu, gendiskp, field, addnd) \ - (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd) - -#define disk_stat_read(gendiskp, field) \ -({ \ - typeof(gendiskp->dkstats->field) res = 0; \ - int i; \ - for_each_possible_cpu(i) \ - res += per_cpu_ptr(gendiskp->dkstats, i)->field; \ - res; \ -}) - -static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) -{ - int i; - - for_each_possible_cpu(i) - memset(per_cpu_ptr(gendiskp->dkstats, i), value, - sizeof(struct disk_stats)); -} +#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) +#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) -#define part_stat_add(cpu, part, field, addnd) \ - (per_cpu_ptr(part->dkstats, cpu)->field += addnd) - -#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \ -({ \ - if (part) \ - part_stat_add(cpu, part, field, addnd); \ - disk_stat_add(cpu, gendiskp, field, addnd); \ -}) +#define __part_stat_add(cpu, part, field, addnd) \ + (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) #define part_stat_read(part, field) \ ({ \ - typeof(part->dkstats->field) res = 0; \ + typeof((part)->dkstats->field) res = 0; \ int i; \ for_each_possible_cpu(i) \ - res += per_cpu_ptr(part->dkstats, i)->field; \ + res += per_cpu_ptr((part)->dkstats, i)->field; \ res; \ }) @@ -284,109 +249,73 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) sizeof(struct disk_stats)); } -#else /* !CONFIG_SMP */ -#define disk_stat_lock() ({ rcu_read_lock(); 0; }) -#define disk_stat_unlock() rcu_read_unlock() - -#define disk_stat_add(cpu, gendiskp, field, addnd) \ - (gendiskp->dkstats.field += addnd) -#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field) - -static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) +static inline int init_part_stats(struct hd_struct *part) { - memset(&gendiskp->dkstats, value, sizeof (struct disk_stats)); + part->dkstats = alloc_percpu(struct disk_stats); + if (!part->dkstats) + return 0; + return 1; } -#define part_stat_add(cpu, part, field, addnd) \ - (part->dkstats.field += addnd) - -#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \ -({ \ - if (part) \ - part_stat_add(cpu, part, field, addnd); \ - disk_stat_add(cpu, gendiskp, field, addnd); \ -}) - -#define part_stat_read(part, field) (part->dkstats.field) - -static inline void part_stat_set_all(struct hd_struct *part, int value) +static inline void free_part_stats(struct hd_struct *part) { - memset(&part->dkstats, value, sizeof(struct disk_stats)); + free_percpu(part->dkstats); } -#endif /* CONFIG_SMP */ - -#define disk_stat_dec(cpu, gendiskp, field) \ - disk_stat_add(cpu, gendiskp, field, -1) -#define disk_stat_inc(cpu, gendiskp, field) \ - disk_stat_add(cpu, gendiskp, field, 1) -#define disk_stat_sub(cpu, gendiskp, field, subnd) \ - disk_stat_add(cpu, gendiskp, field, -subnd) - -#define part_stat_dec(cpu, gendiskp, field) \ - part_stat_add(cpu, gendiskp, field, -1) -#define part_stat_inc(cpu, gendiskp, field) \ - part_stat_add(cpu, gendiskp, field, 1) -#define part_stat_sub(cpu, gendiskp, field, subnd) \ - part_stat_add(cpu, gendiskp, field, -subnd) +#else /* !CONFIG_SMP */ +#define part_stat_lock() ({ rcu_read_lock(); 0; }) +#define part_stat_unlock() rcu_read_unlock() -#define all_stat_dec(cpu, gendiskp, field, sector) \ - all_stat_add(cpu, gendiskp, field, -1, sector) -#define all_stat_inc(cpu, gendiskp, part, field, sector) \ - all_stat_add(cpu, gendiskp, part, field, 1, sector) -#define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \ - all_stat_add(cpu, gendiskp, part, field, -subnd, sector) +#define __part_stat_add(cpu, part, field, addnd) \ + ((part)->dkstats.field += addnd) -/* Inlines to alloc and free disk stats in struct gendisk */ -#ifdef CONFIG_SMP -static inline int init_disk_stats(struct gendisk *disk) -{ - disk->dkstats = alloc_percpu(struct disk_stats); - if (!disk->dkstats) - return 0; - return 1; -} +#define part_stat_read(part, field) ((part)->dkstats.field) -static inline void free_disk_stats(struct gendisk *disk) +static inline void part_stat_set_all(struct hd_struct *part, int value) { - free_percpu(disk->dkstats); + memset(&part->dkstats, value, sizeof(struct disk_stats)); } static inline int init_part_stats(struct hd_struct *part) { - part->dkstats = alloc_percpu(struct disk_stats); - if (!part->dkstats) - return 0; return 1; } static inline void free_part_stats(struct hd_struct *part) { - free_percpu(part->dkstats); } -#else /* CONFIG_SMP */ -static inline int init_disk_stats(struct gendisk *disk) -{ - return 1; -} +#endif /* CONFIG_SMP */ -static inline void free_disk_stats(struct gendisk *disk) -{ -} +#define part_stat_add(cpu, part, field, addnd) do { \ + __part_stat_add((cpu), (part), field, addnd); \ + if ((part)->partno) \ + __part_stat_add((cpu), &part_to_disk((part))->part0, \ + field, addnd); \ +} while (0) -static inline int init_part_stats(struct hd_struct *part) +#define part_stat_dec(cpu, gendiskp, field) \ + part_stat_add(cpu, gendiskp, field, -1) +#define part_stat_inc(cpu, gendiskp, field) \ + part_stat_add(cpu, gendiskp, field, 1) +#define part_stat_sub(cpu, gendiskp, field, subnd) \ + part_stat_add(cpu, gendiskp, field, -subnd) + +static inline void part_inc_in_flight(struct hd_struct *part) { - return 1; + part->in_flight++; + if (part->partno) + part_to_disk(part)->part0.in_flight++; } -static inline void free_part_stats(struct hd_struct *part) +static inline void part_dec_in_flight(struct hd_struct *part) { + part->in_flight--; + if (part->partno) + part_to_disk(part)->part0.in_flight--; } -#endif /* CONFIG_SMP */ /* drivers/block/ll_rw_blk.c */ -extern void disk_round_stats(int cpu, struct gendisk *disk); extern void part_round_stats(int cpu, struct hd_struct *part); /* drivers/block/genhd.c */ @@ -595,6 +524,8 @@ extern void blk_unregister_region(dev_t devt, unsigned long range); extern ssize_t part_size_show(struct device *dev, struct device_attribute *attr, char *buf); +extern ssize_t part_stat_show(struct device *dev, + struct device_attribute *attr, char *buf); #ifdef CONFIG_FAIL_MAKE_REQUEST extern ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, char *buf); -- cgit v1.2.3