forked from Minki/linux
8ae126660f
As generic_make_request() is now able to handle arbitrarily sized bios, it's no longer necessary for each individual block driver to define its own ->merge_bvec_fn() callback. Remove every invocation completely. Cc: Jens Axboe <axboe@kernel.dk> Cc: Lars Ellenberg <drbd-dev@lists.linbit.com> Cc: drbd-user@lists.linbit.com Cc: Jiri Kosina <jkosina@suse.cz> Cc: Yehuda Sadeh <yehuda@inktank.com> Cc: Sage Weil <sage@inktank.com> Cc: Alex Elder <elder@kernel.org> Cc: ceph-devel@vger.kernel.org Cc: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@redhat.com> Cc: dm-devel@redhat.com Cc: Neil Brown <neilb@suse.de> Cc: linux-raid@vger.kernel.org Cc: Christoph Hellwig <hch@infradead.org> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Acked-by: NeilBrown <neilb@suse.de> (for the 'md' bits) Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> [dpark: also remove ->merge_bvec_fn() in dm-thin as well as dm-era-target, and resolve merge conflicts] Signed-off-by: Dongsu Park <dpark@posteo.net> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> Signed-off-by: Jens Axboe <axboe@fb.com>
318 lines
7.5 KiB
C
318 lines
7.5 KiB
C
/*
|
|
linear.c : Multiple Devices driver for Linux
|
|
Copyright (C) 1994-96 Marc ZYNGIER
|
|
<zyngier@ufr-info-p7.ibp.fr> or
|
|
<maz@gloups.fdn.fr>
|
|
|
|
Linear mode management functions.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
(for example /usr/src/linux/COPYING); if not, write to the Free
|
|
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <linux/raid/md_u.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include "md.h"
|
|
#include "linear.h"
|
|
|
|
/*
|
|
* find which device holds a particular offset
|
|
*/
|
|
static inline struct dev_info *which_dev(struct mddev *mddev, sector_t sector)
|
|
{
|
|
int lo, mid, hi;
|
|
struct linear_conf *conf;
|
|
|
|
lo = 0;
|
|
hi = mddev->raid_disks - 1;
|
|
conf = mddev->private;
|
|
|
|
/*
|
|
* Binary Search
|
|
*/
|
|
|
|
while (hi > lo) {
|
|
|
|
mid = (hi + lo) / 2;
|
|
if (sector < conf->disks[mid].end_sector)
|
|
hi = mid;
|
|
else
|
|
lo = mid + 1;
|
|
}
|
|
|
|
return conf->disks + lo;
|
|
}
|
|
|
|
static int linear_congested(struct mddev *mddev, int bits)
|
|
{
|
|
struct linear_conf *conf;
|
|
int i, ret = 0;
|
|
|
|
conf = mddev->private;
|
|
|
|
for (i = 0; i < mddev->raid_disks && !ret ; i++) {
|
|
struct request_queue *q = bdev_get_queue(conf->disks[i].rdev->bdev);
|
|
ret |= bdi_congested(&q->backing_dev_info, bits);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static sector_t linear_size(struct mddev *mddev, sector_t sectors, int raid_disks)
|
|
{
|
|
struct linear_conf *conf;
|
|
sector_t array_sectors;
|
|
|
|
conf = mddev->private;
|
|
WARN_ONCE(sectors || raid_disks,
|
|
"%s does not support generic reshape\n", __func__);
|
|
array_sectors = conf->array_sectors;
|
|
|
|
return array_sectors;
|
|
}
|
|
|
|
static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks)
|
|
{
|
|
struct linear_conf *conf;
|
|
struct md_rdev *rdev;
|
|
int i, cnt;
|
|
bool discard_supported = false;
|
|
|
|
conf = kzalloc (sizeof (*conf) + raid_disks*sizeof(struct dev_info),
|
|
GFP_KERNEL);
|
|
if (!conf)
|
|
return NULL;
|
|
|
|
cnt = 0;
|
|
conf->array_sectors = 0;
|
|
|
|
rdev_for_each(rdev, mddev) {
|
|
int j = rdev->raid_disk;
|
|
struct dev_info *disk = conf->disks + j;
|
|
sector_t sectors;
|
|
|
|
if (j < 0 || j >= raid_disks || disk->rdev) {
|
|
printk(KERN_ERR "md/linear:%s: disk numbering problem. Aborting!\n",
|
|
mdname(mddev));
|
|
goto out;
|
|
}
|
|
|
|
disk->rdev = rdev;
|
|
if (mddev->chunk_sectors) {
|
|
sectors = rdev->sectors;
|
|
sector_div(sectors, mddev->chunk_sectors);
|
|
rdev->sectors = sectors * mddev->chunk_sectors;
|
|
}
|
|
|
|
disk_stack_limits(mddev->gendisk, rdev->bdev,
|
|
rdev->data_offset << 9);
|
|
|
|
conf->array_sectors += rdev->sectors;
|
|
cnt++;
|
|
|
|
if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
|
|
discard_supported = true;
|
|
}
|
|
if (cnt != raid_disks) {
|
|
printk(KERN_ERR "md/linear:%s: not enough drives present. Aborting!\n",
|
|
mdname(mddev));
|
|
goto out;
|
|
}
|
|
|
|
if (!discard_supported)
|
|
queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
|
|
else
|
|
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
|
|
|
|
/*
|
|
* Here we calculate the device offsets.
|
|
*/
|
|
conf->disks[0].end_sector = conf->disks[0].rdev->sectors;
|
|
|
|
for (i = 1; i < raid_disks; i++)
|
|
conf->disks[i].end_sector =
|
|
conf->disks[i-1].end_sector +
|
|
conf->disks[i].rdev->sectors;
|
|
|
|
return conf;
|
|
|
|
out:
|
|
kfree(conf);
|
|
return NULL;
|
|
}
|
|
|
|
static int linear_run (struct mddev *mddev)
|
|
{
|
|
struct linear_conf *conf;
|
|
int ret;
|
|
|
|
if (md_check_no_bitmap(mddev))
|
|
return -EINVAL;
|
|
conf = linear_conf(mddev, mddev->raid_disks);
|
|
|
|
if (!conf)
|
|
return 1;
|
|
mddev->private = conf;
|
|
md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
|
|
|
|
ret = md_integrity_register(mddev);
|
|
if (ret) {
|
|
kfree(conf);
|
|
mddev->private = NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int linear_add(struct mddev *mddev, struct md_rdev *rdev)
|
|
{
|
|
/* Adding a drive to a linear array allows the array to grow.
|
|
* It is permitted if the new drive has a matching superblock
|
|
* already on it, with raid_disk equal to raid_disks.
|
|
* It is achieved by creating a new linear_private_data structure
|
|
* and swapping it in in-place of the current one.
|
|
* The current one is never freed until the array is stopped.
|
|
* This avoids races.
|
|
*/
|
|
struct linear_conf *newconf, *oldconf;
|
|
|
|
if (rdev->saved_raid_disk != mddev->raid_disks)
|
|
return -EINVAL;
|
|
|
|
rdev->raid_disk = rdev->saved_raid_disk;
|
|
rdev->saved_raid_disk = -1;
|
|
|
|
newconf = linear_conf(mddev,mddev->raid_disks+1);
|
|
|
|
if (!newconf)
|
|
return -ENOMEM;
|
|
|
|
mddev_suspend(mddev);
|
|
oldconf = mddev->private;
|
|
mddev->raid_disks++;
|
|
mddev->private = newconf;
|
|
md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
|
|
set_capacity(mddev->gendisk, mddev->array_sectors);
|
|
mddev_resume(mddev);
|
|
revalidate_disk(mddev->gendisk);
|
|
kfree(oldconf);
|
|
return 0;
|
|
}
|
|
|
|
static void linear_free(struct mddev *mddev, void *priv)
|
|
{
|
|
struct linear_conf *conf = priv;
|
|
|
|
kfree(conf);
|
|
}
|
|
|
|
static void linear_make_request(struct mddev *mddev, struct bio *bio)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
struct dev_info *tmp_dev;
|
|
struct bio *split;
|
|
sector_t start_sector, end_sector, data_offset;
|
|
|
|
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
|
|
md_flush_request(mddev, bio);
|
|
return;
|
|
}
|
|
|
|
do {
|
|
tmp_dev = which_dev(mddev, bio->bi_iter.bi_sector);
|
|
start_sector = tmp_dev->end_sector - tmp_dev->rdev->sectors;
|
|
end_sector = tmp_dev->end_sector;
|
|
data_offset = tmp_dev->rdev->data_offset;
|
|
bio->bi_bdev = tmp_dev->rdev->bdev;
|
|
|
|
if (unlikely(bio->bi_iter.bi_sector >= end_sector ||
|
|
bio->bi_iter.bi_sector < start_sector))
|
|
goto out_of_bounds;
|
|
|
|
if (unlikely(bio_end_sector(bio) > end_sector)) {
|
|
/* This bio crosses a device boundary, so we have to
|
|
* split it.
|
|
*/
|
|
split = bio_split(bio, end_sector -
|
|
bio->bi_iter.bi_sector,
|
|
GFP_NOIO, fs_bio_set);
|
|
bio_chain(split, bio);
|
|
} else {
|
|
split = bio;
|
|
}
|
|
|
|
split->bi_iter.bi_sector = split->bi_iter.bi_sector -
|
|
start_sector + data_offset;
|
|
|
|
if (unlikely((split->bi_rw & REQ_DISCARD) &&
|
|
!blk_queue_discard(bdev_get_queue(split->bi_bdev)))) {
|
|
/* Just ignore it */
|
|
bio_endio(split);
|
|
} else
|
|
generic_make_request(split);
|
|
} while (split != bio);
|
|
return;
|
|
|
|
out_of_bounds:
|
|
printk(KERN_ERR
|
|
"md/linear:%s: make_request: Sector %llu out of bounds on "
|
|
"dev %s: %llu sectors, offset %llu\n",
|
|
mdname(mddev),
|
|
(unsigned long long)bio->bi_iter.bi_sector,
|
|
bdevname(tmp_dev->rdev->bdev, b),
|
|
(unsigned long long)tmp_dev->rdev->sectors,
|
|
(unsigned long long)start_sector);
|
|
bio_io_error(bio);
|
|
}
|
|
|
|
static void linear_status (struct seq_file *seq, struct mddev *mddev)
|
|
{
|
|
|
|
seq_printf(seq, " %dk rounding", mddev->chunk_sectors / 2);
|
|
}
|
|
|
|
static void linear_quiesce(struct mddev *mddev, int state)
|
|
{
|
|
}
|
|
|
|
static struct md_personality linear_personality =
|
|
{
|
|
.name = "linear",
|
|
.level = LEVEL_LINEAR,
|
|
.owner = THIS_MODULE,
|
|
.make_request = linear_make_request,
|
|
.run = linear_run,
|
|
.free = linear_free,
|
|
.status = linear_status,
|
|
.hot_add_disk = linear_add,
|
|
.size = linear_size,
|
|
.quiesce = linear_quiesce,
|
|
.congested = linear_congested,
|
|
};
|
|
|
|
static int __init linear_init (void)
|
|
{
|
|
return register_md_personality (&linear_personality);
|
|
}
|
|
|
|
static void linear_exit (void)
|
|
{
|
|
unregister_md_personality (&linear_personality);
|
|
}
|
|
|
|
module_init(linear_init);
|
|
module_exit(linear_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Linear device concatenation personality for MD");
|
|
MODULE_ALIAS("md-personality-1"); /* LINEAR - deprecated*/
|
|
MODULE_ALIAS("md-linear");
|
|
MODULE_ALIAS("md-level--1");
|