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>

1 files changed, 6 insertions, 8 deletions

diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index ea29df36893d..e784a217b500 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -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);