On 01/17/2014 11:56 PM, Matias Bjorling wrote:
On 01/17/2014 01:22 AM, Raghavendra K T wrote:diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index a2e69d2..6b0e049 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -535,6 +535,11 @@ static int null_add_dev(void) if (!nullb) return -ENOMEM; + if (bs > PAGE_SIZE) { + WARN(1, "Invalid block size. Setting it to 4096\n"); + bs = 4096; + } +Use PAGESIZE instead, move it to null_init with the other checks and use pr_warn for issuing the warning.
Thanks. will do that change.
spin_lock_init(&nullb->lock); if (queue_mode == NULL_Q_MQ && use_per_node_hctx) diff --git a/fs/buffer.c b/fs/buffer.c index 6024877..029c698 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -883,6 +883,7 @@ struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size, struct buffer_head *bh, *head; long offset; + BUG_ON(size > PAGE_SIZE); try_again: head = NULL; offset = PAGE_SIZE; @@ -1571,6 +1572,7 @@ void create_empty_buffers(struct page *page, struct buffer_head *bh, *head, *tail; head = alloc_page_buffers(page, blocksize, 1); + BUG_ON(!head); bh = head; do { bh->b_state |= b_state;It seems? that the physical sector size is always limited to the system page size. Why not do the check in add_disk (or __blkdev_get) and fail there, instead of failing on the first partition check?
I believe you meant checking BUG_ON(block size > PAGE_SIZE) could be done earlier in add_disk/__blkdev_get. I 'll check on that.
For null pointer from alloc_page_buffers part (low in memory condition) I think we need to retain that. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
