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Revert "BACKPORT: bio: limit bio max size"

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Revert most of commit 25a6f60b717d ("BACKPORT: bio: limit bio max size")
because it has been reported to cause data corruption and because it has
been reverted upstream. See also
https://lore.kernel.org/linux-block/1620571445.2k94orj8ee.none@localhost/T/#t

Cc: Changheun Lee <nanich.lee@samsung.com>
Cc: Jaegeuk Kim <jaegeuk@google.com>
Bug: 182716953
Change-Id: I79bf39d1d1a0c13cb30ff4b0f1da2b43e1c817f0
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Bart Van Assche 2021-05-09 11:41:06 -07:00
commit a1fbf0ead8
3 changed files with 3 additions and 22 deletions
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15
block/bio.c
View file

@ -287,15 +287,6 @@ void bio_init(struct bio *bio, struct bio_vec *table,
}
EXPORT_SYMBOL(bio_init);
unsigned int bio_max_size(struct bio *bio)
{
struct gendisk *disk = bio->bi_disk;
/* bio_map_kern() allocates a bio but does not set bio->bi_disk. */
return disk ? disk->queue->limits.bio_max_bytes : UINT_MAX;
}
EXPORT_SYMBOL(bio_max_size);
/**
* bio_reset - reinitialize a bio
* @bio: bio to reset
@ -886,7 +877,7 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page,
struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1];
if (page_is_mergeable(bv, page, len, off, same_page)) {
if (bio->bi_iter.bi_size > bio_max_size(bio) - len) {
if (bio->bi_iter.bi_size > UINT_MAX - len) {
*same_page = false;
return false;
}
@ -1003,7 +994,6 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
{
unsigned short nr_pages = bio->bi_max_vecs - bio->bi_vcnt;
unsigned short entries_left = bio->bi_max_vecs - bio->bi_vcnt;
unsigned int bytes_left = bio_max_size(bio) - bio->bi_iter.bi_size;
struct bio_vec *bv = bio->bi_io_vec + bio->bi_vcnt;
struct page **pages = (struct page **)bv;
bool same_page = false;
@ -1019,8 +1009,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
BUILD_BUG_ON(PAGE_PTRS_PER_BVEC < 2);
pages += entries_left * (PAGE_PTRS_PER_BVEC - 1);
size = iov_iter_get_pages(iter, pages, bytes_left, nr_pages,
&offset);
size = iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset);
if (unlikely(size <= 0))
return size ? size : -EFAULT;

6
block/blk-settings.c
View file

@ -37,7 +37,6 @@ EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);
*/
void blk_set_default_limits(struct queue_limits *lim)
{
lim->bio_max_bytes = UINT_MAX;
lim->max_segments = BLK_MAX_SEGMENTS;
lim->max_discard_segments = 1;
lim->max_integrity_segments = 0;
@ -162,11 +161,6 @@ void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_secto
max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors);
max_sectors = min_t(unsigned int, max_sectors, BLK_DEF_MAX_SECTORS);
limits->max_sectors = max_sectors;
if (check_shl_overflow(max_sectors, SECTOR_SHIFT,
&limits->bio_max_bytes))
limits->bio_max_bytes = UINT_MAX;
q->backing_dev_info->io_pages = max_sectors >> (PAGE_SHIFT - 9);
}
EXPORT_SYMBOL(blk_queue_max_hw_sectors);

4
include/linux/bio.h
View file

@ -100,8 +100,6 @@ static inline void *bio_data(struct bio *bio)
return NULL;
}
extern unsigned int bio_max_size(struct bio *bio);
/**
* bio_full - check if the bio is full
* @bio: bio to check
@ -115,7 +113,7 @@ static inline bool bio_full(struct bio *bio, unsigned len)
if (bio->bi_vcnt >= bio->bi_max_vecs)
return true;
if (bio->bi_iter.bi_size > bio_max_size(bio) - len)
if (bio->bi_iter.bi_size > UINT_MAX - len)
return true;
return false;