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dm integrity: add a bitmap mode

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Introduce an alternate mode of operation where dm-integrity uses a
bitmap instead of a journal. If a bit in the bitmap is 1, the
corresponding region's data and integrity tags are not synchronized - if
the machine crashes, the unsynchronized regions will be recalculated.
The bitmap mode is faster than the journal mode, because we don't have
to write the data twice, but it is also less reliable, because if data
corruption happens when the machine crashes, it may not be detected.

Benchmark results for an SSD connected to a SATA300 port, when doing
large linear writes with dd:

buffered I/O:
        raw device throughput - 245MB/s
        dm-integrity with journaling - 120MB/s
        dm-integrity with bitmap - 238MB/s

direct I/O with 1MB block size:
        raw device throughput - 248MB/s
        dm-integrity with journaling - 123MB/s
        dm-integrity with bitmap - 223MB/s

For more info see dm-integrity in Documentation/device-mapper/

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2019-04-29 14:57:24 +02:00 committed by Mike Snitzer
parent 8b3bbd490d
commit 468dfca38b
2 changed files with 524 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
Documentation/device-mapper/dm-integrity.txt
View File

@ -21,6 +21,13 @@ mode it calculates and verifies the integrity tag internally. In this
mode, the dm-integrity target can be used to detect silent data
corruption on the disk or in the I/O path.
There's an alternate mode of operation where dm-integrity uses bitmap
instead of a journal. If a bit in the bitmap is 1, the corresponding
region's data and integrity tags are not synchronized - if the machine
crashes, the unsynchronized regions will be recalculated. The bitmap mode
is faster than the journal mode, because we don't have to write the data
twice, but it is also less reliable, because if data corruption happens
when the machine crashes, it may not be detected.
When loading the target for the first time, the kernel driver will format
the device. But it will only format the device if the superblock contains
@ -59,6 +66,10 @@ Target arguments:
either both data and tag or none of them are written. The
journaled mode degrades write throughput twice because the
data have to be written twice.
B - bitmap mode - data and metadata are written without any
synchronization, the driver maintains a bitmap of dirty
regions where data and metadata don't match. This mode can
only be used with internal hash.
R - recovery mode - in this mode, journal is not replayed,
checksums are not checked and writes to the device are not
allowed. This mode is useful for data recovery if the
@ -150,6 +161,15 @@ block_size:number
Supported values are 512, 1024, 2048 and 4096 bytes. If not
specified the default block size is 512 bytes.
sectors_per_bit:number
In the bitmap mode, this parameter specifies the number of
512-byte sectors that corresponds to one bitmap bit.
bitmap_flush_interval:number
The bitmap flush interval in milliseconds. The metadata buffers
are synchronized when this interval expires.
The journal mode (D/J), buffer_sectors, journal_watermark, commit_time can
be changed when reloading the target (load an inactive table and swap the
tables with suspend and resume). The other arguments should not be changed
@ -174,6 +194,8 @@ The layout of the formatted block device:
* flags
SB_FLAG_HAVE_JOURNAL_MAC - a flag is set if journal_mac is used
SB_FLAG_RECALCULATING - recalculating is in progress
SB_FLAG_DIRTY_BITMAP - journal area contains the bitmap of dirty
blocks
* log2(sectors per block)
* a position where recalculating finished
* journal

534
drivers/md/dm-integrity.c
View File

@ -24,6 +24,7 @@
#define DEFAULT_INTERLEAVE_SECTORS 32768
#define DEFAULT_JOURNAL_SIZE_FACTOR 7
#define DEFAULT_SECTORS_PER_BITMAP_BIT 32768
#define DEFAULT_BUFFER_SECTORS 128
#define DEFAULT_JOURNAL_WATERMARK 50
#define DEFAULT_SYNC_MSEC 10000
@ -33,6 +34,8 @@
#define METADATA_WORKQUEUE_MAX_ACTIVE 16
#define RECALC_SECTORS 8192
#define RECALC_WRITE_SUPER 16
#define BITMAP_BLOCK_SIZE 4096 /* don't change it */
#define BITMAP_FLUSH_INTERVAL (10 * HZ)
/*
* Warning - DEBUG_PRINT prints security-sensitive data to the log,
@ -48,6 +51,7 @@
#define SB_MAGIC "integrt"
#define SB_VERSION_1 1
#define SB_VERSION_2 2
#define SB_VERSION_3 3
#define SB_SECTORS 8
#define MAX_SECTORS_PER_BLOCK 8
@ -60,12 +64,14 @@ struct superblock {
__u64 provided_data_sectors; /* userspace uses this value */
__u32 flags;
__u8 log2_sectors_per_block;
__u8 pad[3];
__u8 log2_blocks_per_bitmap_bit;
__u8 pad[2];
__u64 recalc_sector;
};
#define SB_FLAG_HAVE_JOURNAL_MAC 0x1
#define SB_FLAG_RECALCULATING 0x2
#define SB_FLAG_DIRTY_BITMAP 0x4
#define JOURNAL_ENTRY_ROUNDUP 8
@ -155,9 +161,16 @@ struct dm_integrity_c {
struct workqueue_struct *metadata_wq;
struct superblock *sb;
unsigned journal_pages;
unsigned n_bitmap_blocks;
struct page_list *journal;
struct page_list *journal_io;
struct page_list *journal_xor;
struct page_list *recalc_bitmap;
struct page_list *may_write_bitmap;
struct bitmap_block_status *bbs;
unsigned bitmap_flush_interval;
struct delayed_work bitmap_flush_work;
struct crypto_skcipher *journal_crypt;
struct scatterlist **journal_scatterlist;
@ -184,6 +197,7 @@ struct dm_integrity_c {
__s8 log2_metadata_run;
__u8 log2_buffer_sectors;
__u8 sectors_per_block;
__u8 log2_blocks_per_bitmap_bit;
unsigned char mode;
int suspending;
@ -236,6 +250,7 @@ struct dm_integrity_c {
bool journal_uptodate;
bool just_formatted;
bool recalculate_flag;
struct alg_spec internal_hash_alg;
struct alg_spec journal_crypt_alg;
@ -292,6 +307,16 @@ struct journal_io {
struct journal_completion *comp;
};
struct bitmap_block_status {
struct work_struct work;
struct dm_integrity_c *ic;
unsigned idx;
unsigned long *bitmap;
struct bio_list bio_queue;
spinlock_t bio_queue_lock;
};
static struct kmem_cache *journal_io_cache;
#define JOURNAL_IO_MEMPOOL 32
@ -427,7 +452,9 @@ static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
static void sb_set_version(struct dm_integrity_c *ic)
{
if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP))
ic->sb->version = SB_VERSION_3;
else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
ic->sb->version = SB_VERSION_2;
else
ic->sb->version = SB_VERSION_1;
@ -451,6 +478,135 @@ static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags)
return dm_io(&io_req, 1, &io_loc, NULL);
}
#define BITMAP_OP_TEST_ALL_SET 0
#define BITMAP_OP_TEST_ALL_CLEAR 1
#define BITMAP_OP_SET 2
#define BITMAP_OP_CLEAR 3
static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap, sector_t sector, sector_t n_sectors, int mode)
{
unsigned long bit, end_bit, this_end_bit, page, end_page;
unsigned long *data;
if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) {
DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)\n",
(unsigned long long)sector,
(unsigned long long)n_sectors,
ic->sb->log2_sectors_per_block,
ic->log2_blocks_per_bitmap_bit,
mode);
BUG();
}
if (unlikely(!n_sectors))
return true;
bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
end_bit = (sector + n_sectors - 1) >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
page = bit / (PAGE_SIZE * 8);
bit %= PAGE_SIZE * 8;
end_page = end_bit / (PAGE_SIZE * 8);
end_bit %= PAGE_SIZE * 8;
repeat:
if (page < end_page) {
this_end_bit = PAGE_SIZE * 8 - 1;
} else {
this_end_bit = end_bit;
}
data = lowmem_page_address(bitmap[page].page);
if (mode == BITMAP_OP_TEST_ALL_SET) {
while (bit <= this_end_bit) {
if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
do {
if (data[bit / BITS_PER_LONG] != -1)
return false;
bit += BITS_PER_LONG;
} while (this_end_bit >= bit + BITS_PER_LONG - 1);
continue;
}
if (!test_bit(bit, data))
return false;
bit++;
}
} else if (mode == BITMAP_OP_TEST_ALL_CLEAR) {
while (bit <= this_end_bit) {
if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
do {
if (data[bit / BITS_PER_LONG] != 0)
return false;
bit += BITS_PER_LONG;
} while (this_end_bit >= bit + BITS_PER_LONG - 1);
continue;
}
if (test_bit(bit, data))
return false;
bit++;
}
} else if (mode == BITMAP_OP_SET) {
while (bit <= this_end_bit) {
if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
do {
data[bit / BITS_PER_LONG] = -1;
bit += BITS_PER_LONG;
} while (this_end_bit >= bit + BITS_PER_LONG - 1);
continue;
}
__set_bit(bit, data);
bit++;
}
} else if (mode == BITMAP_OP_CLEAR) {
if (!bit && this_end_bit == PAGE_SIZE * 8 - 1)
clear_page(data);
else while (bit <= this_end_bit) {
if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
do {
data[bit / BITS_PER_LONG] = 0;
bit += BITS_PER_LONG;
} while (this_end_bit >= bit + BITS_PER_LONG - 1);
continue;
}
__clear_bit(bit, data);
bit++;
}
} else {
BUG();
}
if (unlikely(page < end_page)) {
bit = 0;
page++;
goto repeat;
}
return true;
}
static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src)
{
unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
unsigned i;
for (i = 0; i < n_bitmap_pages; i++) {
unsigned long *dst_data = lowmem_page_address(dst[i].page);
unsigned long *src_data = lowmem_page_address(src[i].page);
copy_page(dst_data, src_data);
}
}
static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector)
{
unsigned bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
unsigned bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8);
BUG_ON(bitmap_block >= ic->n_bitmap_blocks);
return &ic->bbs[bitmap_block];
}
static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
bool e, const char *function)
{
@ -1784,6 +1940,20 @@ offload_to_thread:
goto journal_read_write;
}
if (ic->mode == 'B' && dio->write) {
if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector, dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
struct bitmap_block_status *bbs = sector_to_bitmap_block(ic, dio->range.logical_sector);
spin_lock(&bbs->bio_queue_lock);
bio_list_add(&bbs->bio_queue, bio);
spin_unlock(&bbs->bio_queue_lock);
queue_work(ic->writer_wq, &bbs->work);
return;
}
}
dio->in_flight = (atomic_t)ATOMIC_INIT(2);
if (need_sync_io) {
@ -1810,10 +1980,14 @@ offload_to_thread:
if (need_sync_io) {
wait_for_completion_io(&read_comp);
if (unlikely(ic->recalc_wq != NULL) &&
ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
goto skip_check;
if (ic->mode == 'B') {
if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector, dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
goto skip_check;
}
if (likely(!bio->bi_status))
integrity_metadata(&dio->work);
else
@ -1851,8 +2025,22 @@ static void pad_uncommitted(struct dm_integrity_c *ic)
wraparound_section(ic, &ic->free_section);
ic->n_uncommitted_sections++;
}
WARN_ON(ic->journal_sections * ic->journal_section_entries !=
(ic->n_uncommitted_sections + ic->n_committed_sections) * ic->journal_section_entries + ic->free_sectors);
if (WARN_ON(ic->journal_sections * ic->journal_section_entries !=
(ic->n_uncommitted_sections + ic->n_committed_sections) * ic->journal_section_entries + ic->free_sectors)) {
printk(KERN_CRIT "dm-integrity: "
"journal_sections %u, "
"journal_section_entries %u, "
"n_uncommitted_sections %u, "
"n_committed_sections %u, "
"journal_section_entries %u, "
"free_sectors %u\n",
ic->journal_sections,
ic->journal_section_entries,
ic->n_uncommitted_sections,
ic->n_committed_sections,
ic->journal_section_entries,
ic->free_sectors);
}
}
static void integrity_commit(struct work_struct *w)
@ -2139,11 +2327,14 @@ static void integrity_recalc(struct work_struct *w)
sector_t area, offset;
sector_t metadata_block;
unsigned metadata_offset;
sector_t logical_sector, n_sectors;
__u8 *t;
unsigned i;
int r;
unsigned super_counter = 0;
DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector));
spin_lock_irq(&ic->endio_wait.lock);
next_chunk:
@ -2152,8 +2343,13 @@ next_chunk:
goto unlock_ret;
range.logical_sector = le64_to_cpu(ic->sb->recalc_sector);
if (unlikely(range.logical_sector >= ic->provided_data_sectors))
if (unlikely(range.logical_sector >= ic->provided_data_sectors)) {
if (ic->mode == 'B') {
DEBUG_print("queue_delayed_work: bitmap_flush_work\n");
queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
}
goto unlock_ret;
}
get_area_and_offset(ic, range.logical_sector, &area, &offset);
range.n_sectors = min((sector_t)RECALC_SECTORS, ic->provided_data_sectors - range.logical_sector);
@ -2161,11 +2357,33 @@ next_chunk:
range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned)offset);
add_new_range_and_wait(ic, &range);
spin_unlock_irq(&ic->endio_wait.lock);
logical_sector = range.logical_sector;
n_sectors = range.n_sectors;
if (ic->mode == 'B') {
if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) {
goto advance_and_next;
}
while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
logical_sector += ic->sectors_per_block;
n_sectors -= ic->sectors_per_block;
cond_resched();
}
while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block, ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
n_sectors -= ic->sectors_per_block;
cond_resched();
}
get_area_and_offset(ic, logical_sector, &area, &offset);
}
DEBUG_print("recalculating: %lx, %lx\n", logical_sector, n_sectors);
if (unlikely(++super_counter == RECALC_WRITE_SUPER)) {
recalc_write_super(ic);
if (ic->mode == 'B') {
queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
}
super_counter = 0;
}
@ -2180,7 +2398,7 @@ next_chunk:
io_req.client = ic->io;
io_loc.bdev = ic->dev->bdev;
io_loc.sector = get_data_sector(ic, area, offset);
io_loc.count = range.n_sectors;
io_loc.count = n_sectors;
r = dm_io(&io_req, 1, &io_loc, NULL);
if (unlikely(r)) {
@ -2189,8 +2407,8 @@ next_chunk:
}
t = ic->recalc_tags;
for (i = 0; i < range.n_sectors; i += ic->sectors_per_block) {
integrity_sector_checksum(ic, range.logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t);
for (i = 0; i < n_sectors; i += ic->sectors_per_block) {
integrity_sector_checksum(ic, logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t);
t += ic->tag_size;
}
@ -2202,6 +2420,9 @@ next_chunk:
goto err;
}
advance_and_next:
cond_resched();
spin_lock_irq(&ic->endio_wait.lock);
remove_range_unlocked(ic, &range);
ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors);
@ -2217,6 +2438,89 @@ unlock_ret:
recalc_write_super(ic);
}
static void bitmap_block_work(struct work_struct *w)
{
struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work);
struct dm_integrity_c *ic = bbs->ic;
struct bio *bio;
struct bio_list bio_queue;
struct bio_list waiting;
bio_list_init(&waiting);
spin_lock(&bbs->bio_queue_lock);
bio_queue = bbs->bio_queue;
bio_list_init(&bbs->bio_queue);
spin_unlock(&bbs->bio_queue_lock);
while ((bio = bio_list_pop(&bio_queue))) {
struct dm_integrity_io *dio;
dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector, dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
remove_range(ic, &dio->range);
INIT_WORK(&dio->work, integrity_bio_wait);
queue_work(ic->wait_wq, &dio->work);
} else {
block_bitmap_op(ic, ic->journal, dio->range.logical_sector, dio->range.n_sectors, BITMAP_OP_SET);
bio_list_add(&waiting, bio);
}
}
if (bio_list_empty(&waiting))
return;
rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL);
while ((bio = bio_list_pop(&waiting))) {
struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector, dio->range.n_sectors, BITMAP_OP_SET);
remove_range(ic, &dio->range);
INIT_WORK(&dio->work, integrity_bio_wait);
queue_work(ic->wait_wq, &dio->work);
}
queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
}
static void bitmap_flush_work(struct work_struct *work)
{
struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work);
struct dm_integrity_range range;
unsigned long limit;
dm_integrity_flush_buffers(ic);
range.logical_sector = 0;
range.n_sectors = ic->provided_data_sectors;
spin_lock_irq(&ic->endio_wait.lock);
add_new_range_and_wait(ic, &range);
spin_unlock_irq(&ic->endio_wait.lock);
dm_integrity_flush_buffers(ic);
if (ic->meta_dev)
blkdev_issue_flush(ic->dev->bdev, GFP_NOIO, NULL);
limit = ic->provided_data_sectors;
if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
limit = le64_to_cpu(ic->sb->recalc_sector)
>> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)
<< (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
}
DEBUG_print("zeroing journal\n");
block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR);
block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR);
rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0, ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
remove_range(ic, &range);
}
static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
unsigned n_sections, unsigned char commit_seq)
{
@ -2416,6 +2720,7 @@ clear_journal:
static void dm_integrity_postsuspend(struct dm_target *ti)
{
struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
int r;
del_timer_sync(&ic->autocommit_timer);
@ -2424,6 +2729,9 @@ static void dm_integrity_postsuspend(struct dm_target *ti)
if (ic->recalc_wq)
drain_workqueue(ic->recalc_wq);
if (ic->mode == 'B')
cancel_delayed_work_sync(&ic->bitmap_flush_work);
queue_work(ic->commit_wq, &ic->commit_work);
drain_workqueue(ic->commit_wq);
@ -2434,6 +2742,17 @@ static void dm_integrity_postsuspend(struct dm_target *ti)
dm_integrity_flush_buffers(ic);
}
if (ic->mode == 'B') {
dm_integrity_flush_buffers(ic);
#if 1
init_journal(ic, 0, ic->journal_sections, 0);
ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
if (unlikely(r))
dm_integrity_io_error(ic, "writing superblock", r);
#endif
}
WRITE_ONCE(ic->suspending, 0);
BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
@ -2444,11 +2763,65 @@ static void dm_integrity_postsuspend(struct dm_target *ti)
static void dm_integrity_resume(struct dm_target *ti)
{
struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
int r;
DEBUG_print("resume\n");
replay_journal(ic);
if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
DEBUG_print("resume dirty_bitmap\n");
rw_journal_sectors(ic, REQ_OP_READ, 0, 0, ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
if (ic->mode == 'B') {
if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR)) {
ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
ic->sb->recalc_sector = cpu_to_le64(0);
}
} else {
DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n", ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit);
ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET);
rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0, ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
ic->sb->recalc_sector = cpu_to_le64(0);
}
} else {
if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR))) {
ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
ic->sb->recalc_sector = cpu_to_le64(0);
}
init_journal(ic, 0, ic->journal_sections, 0);
replay_journal(ic);
ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
}
r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
if (unlikely(r))
dm_integrity_io_error(ic, "writing superblock", r);
} else {
replay_journal(ic);
if (ic->mode == 'B') {
int mode;
ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
if (unlikely(r))
dm_integrity_io_error(ic, "writing superblock", r);
if (ic->recalc_wq && ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
mode = ic->recalculate_flag ? BITMAP_OP_SET : BITMAP_OP_CLEAR;
block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, mode);
block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, mode);
block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, mode);
rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0, ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
}
}
DEBUG_print("testing recalc: %x\n", ic->sb->flags);
if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
__u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector);
DEBUG_print("recalc pos: %lx / %lx\n", (long)recalc_pos, ic->provided_data_sectors);
if (recalc_pos < ic->provided_data_sectors) {
queue_work(ic->recalc_wq, &ic->recalc_work);
} else if (recalc_pos > ic->provided_data_sectors) {
@ -2486,6 +2859,8 @@ static void dm_integrity_status(struct dm_target *ti, status_type_t type,
arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
arg_count += ic->mode == 'J';
arg_count += ic->mode == 'J';
arg_count += ic->mode == 'B';
arg_count += ic->mode == 'B';
arg_count += !!ic->internal_hash_alg.alg_string;
arg_count += !!ic->journal_crypt_alg.alg_string;
arg_count += !!ic->journal_mac_alg.alg_string;
@ -2495,7 +2870,7 @@ static void dm_integrity_status(struct dm_target *ti, status_type_t type,
DMEMIT(" meta_device:%s", ic->meta_dev->name);
if (ic->sectors_per_block != 1)
DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
if (ic->recalculate_flag)
DMEMIT(" recalculate");
DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
@ -2504,6 +2879,10 @@ static void dm_integrity_status(struct dm_target *ti, status_type_t type,
DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
DMEMIT(" commit_time:%u", ic->autocommit_msec);
}
if (ic->mode == 'B') {
DMEMIT(" sectors_per_bit:%llu", (unsigned long long)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit);
DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval));
}
#define EMIT_ALG(a, n) \
do { \
@ -3085,7 +3464,7 @@ bad:
* device
* offset from the start of the device
* tag size
* D - direct writes, J - journal writes, R - recovery mode
* D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode
* number of optional arguments
* optional arguments:
* journal_sectors
@ -3095,6 +3474,8 @@ bad:
* commit_time
* meta_device
* block_size
* sectors_per_bit
* bitmap_flush_interval
* internal_hash
* journal_crypt
* journal_mac
@ -3111,10 +3492,13 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
{0, 9, "Invalid number of feature args"},
};
unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
bool recalculate;
bool should_write_sb;
__u64 threshold;
unsigned long long start;
__s8 log2_sectors_per_bitmap_bit = -1;
__s8 log2_blocks_per_bitmap_bit;
__u64 bits_in_journal;
__u64 n_bitmap_bits;
#define DIRECT_ARGUMENTS 4
@ -3138,6 +3522,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
init_waitqueue_head(&ic->copy_to_journal_wait);
init_completion(&ic->crypto_backoff);
atomic64_set(&ic->number_of_mismatches, 0);
ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL;
r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
if (r) {
@ -3160,10 +3545,10 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
}
}
if (!strcmp(argv[3], "J") || !strcmp(argv[3], "D") || !strcmp(argv[3], "R"))
if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") || !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) {
ic->mode = argv[3][0];
else {
ti->error = "Invalid mode (expecting J, D, R)";
} else {
ti->error = "Invalid mode (expecting J, B, D, R)";
r = -EINVAL;
goto bad;
}
@ -3173,7 +3558,6 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
buffer_sectors = DEFAULT_BUFFER_SECTORS;
journal_watermark = DEFAULT_JOURNAL_WATERMARK;
sync_msec = DEFAULT_SYNC_MSEC;
recalculate = false;
ic->sectors_per_block = 1;
as.argc = argc - DIRECT_ARGUMENTS;
@ -3185,6 +3569,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
while (extra_args--) {
const char *opt_string;
unsigned val;
unsigned long long llval;
opt_string = dm_shift_arg(&as);
if (!opt_string) {
r = -EINVAL;
@ -3220,6 +3605,14 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
goto bad;
}
ic->sectors_per_block = val >> SECTOR_SHIFT;
} else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
} else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
r = -EINVAL;
ti->error = "Invalid bitmap_flush_interval argument";
}
ic->bitmap_flush_interval = msecs_to_jiffies(val);
} else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
"Invalid internal_hash argument");
@ -3236,7 +3629,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
if (r)
goto bad;
} else if (!strcmp(opt_string, "recalculate")) {
recalculate = true;
ic->recalculate_flag = true;
} else {
r = -EINVAL;
ti->error = "Invalid argument";
@ -3287,6 +3680,12 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
else
ic->log2_tag_size = -1;
if (ic->mode == 'B' && !ic->internal_hash) {
r = -EINVAL;
ti->error = "Bitmap mode can be only used with internal hash";
goto bad;
}
ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
ic->autocommit_msec = sync_msec;
timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
@ -3332,7 +3731,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
}
INIT_WORK(&ic->commit_work, integrity_commit);
if (ic->mode == 'J') {
if (ic->mode == 'J' || ic->mode == 'B') {
ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
if (!ic->writer_wq) {
ti->error = "Cannot allocate workqueue";
@ -3373,7 +3772,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
should_write_sb = true;
}
if (!ic->sb->version || ic->sb->version > SB_VERSION_2) {
if (!ic->sb->version || ic->sb->version > SB_VERSION_3) {
r = -EINVAL;
ti->error = "Unknown version";
goto bad;
@ -3433,6 +3832,27 @@ try_smaller_buffer:
ti->error = "The device is too small";
goto bad;
}
if (log2_sectors_per_bitmap_bit < 0)
log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT);
if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block)
log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block;
bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3);
if (bits_in_journal > UINT_MAX)
bits_in_journal = UINT_MAX;
while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit)
log2_sectors_per_bitmap_bit++;
log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block;
ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
if (should_write_sb) {
ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
}
n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block)
+ (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit;
ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8);
if (!ic->meta_dev)
ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run));
@ -3457,25 +3877,21 @@ try_smaller_buffer:
DEBUG_print(" journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
DEBUG_print(" journal_entries %u\n", ic->journal_entries);
DEBUG_print(" log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
DEBUG_print(" data_device_sectors 0x%llx\n", (unsigned long long)ic->data_device_sectors);
DEBUG_print(" data_device_sectors 0x%llx\n", i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT);
DEBUG_print(" initial_sectors 0x%x\n", ic->initial_sectors);
DEBUG_print(" metadata_run 0x%x\n", ic->metadata_run);
DEBUG_print(" log2_metadata_run %d\n", ic->log2_metadata_run);
DEBUG_print(" provided_data_sectors 0x%llx (%llu)\n", (unsigned long long)ic->provided_data_sectors,
(unsigned long long)ic->provided_data_sectors);
DEBUG_print(" log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
DEBUG_print(" bits_in_journal %llu\n", (unsigned long long)bits_in_journal);
if (recalculate && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
ic->sb->recalc_sector = cpu_to_le64(0);
}
if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
if (!ic->internal_hash) {
r = -EINVAL;
ti->error = "Recalculate is only valid with internal hash";
goto bad;
}
if (ic->internal_hash) {
ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1);
if (!ic->recalc_wq ) {
ti->error = "Cannot allocate workqueue";
@ -3512,6 +3928,45 @@ try_smaller_buffer:
r = create_journal(ic, &ti->error);
if (r)
goto bad;
}
if (ic->mode == 'B') {
unsigned i;
unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
if (!ic->recalc_bitmap) {
r = -ENOMEM;
goto bad;
}
ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
if (!ic->may_write_bitmap) {
r = -ENOMEM;
goto bad;
}
ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL);
if (!ic->bbs) {
r = -ENOMEM;
goto bad;
}
INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work);
for (i = 0; i < ic->n_bitmap_blocks; i++) {
struct bitmap_block_status *bbs = &ic->bbs[i];
unsigned sector, pl_index, pl_offset;
INIT_WORK(&bbs->work, bitmap_block_work);
bbs->ic = ic;
bbs->idx = i;
bio_list_init(&bbs->bio_queue);
spin_lock_init(&bbs->bio_queue_lock);
sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT);
pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset;
}
}
if (should_write_sb) {
@ -3536,6 +3991,17 @@ try_smaller_buffer:
if (r)
goto bad;
}
if (ic->mode == 'B') {
unsigned max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8);
if (!max_io_len)
max_io_len = 1U << 31;
DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len);
if (!ti->max_io_len || ti->max_io_len > max_io_len) {
r = dm_set_target_max_io_len(ti, max_io_len);
if (r)
goto bad;
}
}
if (!ic->internal_hash)
dm_integrity_set(ti, ic);
@ -3544,6 +4010,7 @@ try_smaller_buffer:
ti->flush_supported = true;
return 0;
bad:
dm_integrity_dtr(ti);
return r;
@ -3568,6 +4035,7 @@ static void dm_integrity_dtr(struct dm_target *ti)
destroy_workqueue(ic->recalc_wq);
vfree(ic->recalc_buffer);
kvfree(ic->recalc_tags);
kvfree(ic->bbs);
if (ic->bufio)
dm_bufio_client_destroy(ic->bufio);
mempool_exit(&ic->journal_io_mempool);
@ -3580,6 +4048,8 @@ static void dm_integrity_dtr(struct dm_target *ti)
dm_integrity_free_page_list(ic->journal);
dm_integrity_free_page_list(ic->journal_io);
dm_integrity_free_page_list(ic->journal_xor);
dm_integrity_free_page_list(ic->recalc_bitmap);
dm_integrity_free_page_list(ic->may_write_bitmap);
if (ic->journal_scatterlist)
dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
if (ic->journal_io_scatterlist)
@ -3617,7 +4087,7 @@ static void dm_integrity_dtr(struct dm_target *ti)
static struct target_type integrity_target = {
.name = "integrity",
.version = {1, 2, 0},
.version = {1, 3, 0},
.module = THIS_MODULE,
.features = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
.ctr = dm_integrity_ctr,