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logfs: query block device for number of pages to send with bio 

The block device driver puts a limit on maximum number of pages that
can be sent with the bio. Not all block devices can handle
BIO_MAX_PAGES number of pages in bio. Specifically the virtio-blk
diriver limits it to 126. When the LogFS file system was excersized in
KVM, the following bug from do_virtblk_request() was observed

static void do_virtblk_request(struct request_queue *q)
{
	....
	....
	while ((req = blk_peek_request(q)) != NULL) {
		BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
		....
		....
	}
	....
}

The patch fixes the problem by querring the maximum number of pages in
bio allowed from block device driver and then using those many pages
during submit_bio.

Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>
This commit is contained in:
Prasad Joshi 2012-07-23 10:32:11 +05:30
parent 41b93bc1ee
commit 9f0bbd8ca7
1 changed files with 6 additions and 8 deletions
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14
fs/logfs/dev_bdev.c
View File

@ -96,12 +96,11 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
struct address_space *mapping = super->s_mapping_inode->i_mapping;
struct bio *bio;
struct page *page;
struct request_queue *q = bdev_get_queue(sb->s_bdev);
unsigned int max_pages = queue_max_hw_sectors(q) >> (PAGE_SHIFT - 9);
unsigned int max_pages;
int i;
if (max_pages > BIO_MAX_PAGES)
max_pages = BIO_MAX_PAGES;
max_pages = min(nr_pages, (size_t) bio_get_nr_vecs(super->s_bdev));
bio = bio_alloc(GFP_NOFS, max_pages);
BUG_ON(!bio);
@ -191,12 +190,11 @@ static int do_erase(struct super_block *sb, u64 ofs, pgoff_t index,
{
struct logfs_super *super = logfs_super(sb);
struct bio *bio;
struct request_queue *q = bdev_get_queue(sb->s_bdev);
unsigned int max_pages = queue_max_hw_sectors(q) >> (PAGE_SHIFT - 9);
unsigned int max_pages;
int i;
if (max_pages > BIO_MAX_PAGES)
max_pages = BIO_MAX_PAGES;
max_pages = min(nr_pages, (size_t) bio_get_nr_vecs(super->s_bdev));
bio = bio_alloc(GFP_NOFS, max_pages);
BUG_ON(!bio);