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Device-mapper fixes for 3.3. 

Eight small device-mapper bug fixes.
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Merge tag 'dm-3.3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm

Pull device-mapper fixes for 3.3 from Alasdair Kergon

Eight small device-mapper bug fixes.

* tag 'dm-3.3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
  dm raid: fix flush support
  dm raid: set MD_CHANGE_DEVS when rebuilding
  dm thin metadata: decrement counter after removing mapped block
  dm thin metadata: unlock superblock in init_pmd error path
  dm thin metadata: remove incorrect close_device on creation error paths
  dm flakey: fix crash on read when corrupt_bio_byte not set
  dm io: fix discard support
  dm ioctl: do not leak argv if target message only contains whitespace
This commit is contained in:
Linus Torvalds 2012-03-08 17:21:51 -08:00
parent 4f262acfde 0ca93de9b7
commit 5d0edf2915
5 changed files with 49 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/dm-flakey.c
View File

@ -323,7 +323,7 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio,
* Corrupt successful READs while in down state.
* If flags were specified, only corrupt those that match.
*/
if (!error && bio_submitted_while_down &&
if (fc->corrupt_bio_byte && !error && bio_submitted_while_down &&
(bio_data_dir(bio) == READ) && (fc->corrupt_bio_rw == READ) &&
all_corrupt_bio_flags_match(bio, fc))
corrupt_bio_data(bio, fc);

23
drivers/md/dm-io.c
View File

@ -296,6 +296,8 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
unsigned offset;
unsigned num_bvecs;
sector_t remaining = where->count;
struct request_queue *q = bdev_get_queue(where->bdev);
sector_t discard_sectors;
/*
* where->count may be zero if rw holds a flush and we need to
@ -305,9 +307,12 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
/*
* Allocate a suitably sized-bio.
*/
num_bvecs = dm_sector_div_up(remaining,
(PAGE_SIZE >> SECTOR_SHIFT));
num_bvecs = min_t(int, bio_get_nr_vecs(where->bdev), num_bvecs);
if (rw & REQ_DISCARD)
num_bvecs = 1;
else
num_bvecs = min_t(int, bio_get_nr_vecs(where->bdev),
dm_sector_div_up(remaining, (PAGE_SIZE >> SECTOR_SHIFT)));
bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, io->client->bios);
bio->bi_sector = where->sector + (where->count - remaining);
bio->bi_bdev = where->bdev;
@ -315,10 +320,14 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
bio->bi_destructor = dm_bio_destructor;
store_io_and_region_in_bio(bio, io, region);
/*
* Try and add as many pages as possible.
*/
while (remaining) {
if (rw & REQ_DISCARD) {
discard_sectors = min_t(sector_t, q->limits.max_discard_sectors, remaining);
bio->bi_size = discard_sectors << SECTOR_SHIFT;
remaining -= discard_sectors;
} else while (remaining) {
/*
* Try and add as many pages as possible.
*/
dp->get_page(dp, &page, &len, &offset);
len = min(len, to_bytes(remaining));
if (!bio_add_page(bio, page, len, offset))

2
drivers/md/dm-ioctl.c
View File

@ -1437,7 +1437,7 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
if (!argc) {
DMWARN("Empty message received.");
goto out;
goto out_argv;
}
table = dm_get_live_table(md);

17
drivers/md/dm-raid.c
View File

@ -668,7 +668,14 @@ static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
return ret;
sb = page_address(rdev->sb_page);
if (sb->magic != cpu_to_le32(DM_RAID_MAGIC)) {
/*
* Two cases that we want to write new superblocks and rebuild:
* 1) New device (no matching magic number)
* 2) Device specified for rebuild (!In_sync w/ offset == 0)
*/
if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
(!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
super_sync(rdev->mddev, rdev);
set_bit(FirstUse, &rdev->flags);
@ -745,11 +752,8 @@ static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev)
*/
rdev_for_each(r, t, mddev) {
if (!test_bit(In_sync, &r->flags)) {
if (!test_bit(FirstUse, &r->flags))
DMERR("Superblock area of "
"rebuild device %d should have been "
"cleared.", r->raid_disk);
set_bit(FirstUse, &r->flags);
DMINFO("Device %d specified for rebuild: "
"Clearing superblock", r->raid_disk);
rebuilds++;
} else if (test_bit(FirstUse, &r->flags))
new_devs++;
@ -971,6 +975,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
INIT_WORK(&rs->md.event_work, do_table_event);
ti->private = rs;
ti->num_flush_requests = 1;
mutex_lock(&rs->md.reconfig_mutex);
ret = md_run(&rs->md);

25
drivers/md/dm-thin-metadata.c
View File

@ -385,6 +385,7 @@ static int init_pmd(struct dm_pool_metadata *pmd,
data_sm = dm_sm_disk_create(tm, nr_blocks);
if (IS_ERR(data_sm)) {
DMERR("sm_disk_create failed");
dm_tm_unlock(tm, sblock);
r = PTR_ERR(data_sm);
goto bad;
}
@ -789,6 +790,11 @@ int dm_pool_metadata_close(struct dm_pool_metadata *pmd)
return 0;
}
/*
* __open_device: Returns @td corresponding to device with id @dev,
* creating it if @create is set and incrementing @td->open_count.
* On failure, @td is undefined.
*/
static int __open_device(struct dm_pool_metadata *pmd,
dm_thin_id dev, int create,
struct dm_thin_device **td)
@ -799,10 +805,16 @@ static int __open_device(struct dm_pool_metadata *pmd,
struct disk_device_details details_le;
/*
* Check the device isn't already open.
* If the device is already open, return it.
*/
list_for_each_entry(td2, &pmd->thin_devices, list)
if (td2->id == dev) {
/*
* May not create an already-open device.
*/
if (create)
return -EEXIST;
td2->open_count++;
*td = td2;
return 0;
@ -817,6 +829,9 @@ static int __open_device(struct dm_pool_metadata *pmd,
if (r != -ENODATA || !create)
return r;
/*
* Create new device.
*/
changed = 1;
details_le.mapped_blocks = 0;
details_le.transaction_id = cpu_to_le64(pmd->trans_id);
@ -882,12 +897,10 @@ static int __create_thin(struct dm_pool_metadata *pmd,
r = __open_device(pmd, dev, 1, &td);
if (r) {
__close_device(td);
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
dm_btree_del(&pmd->bl_info, dev_root);
return r;
}
td->changed = 1;
__close_device(td);
return r;
@ -967,14 +980,14 @@ static int __create_snap(struct dm_pool_metadata *pmd,
goto bad;
r = __set_snapshot_details(pmd, td, origin, pmd->time);
__close_device(td);
if (r)
goto bad;
__close_device(td);
return 0;
bad:
__close_device(td);
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
dm_btree_remove(&pmd->details_info, pmd->details_root,
&key, &pmd->details_root);
@ -1211,6 +1224,8 @@ static int __remove(struct dm_thin_device *td, dm_block_t block)
if (r)
return r;
td->mapped_blocks--;
td->changed = 1;
pmd->need_commit = 1;
return 0;