The maximum IO size that a block device can read as a single block is based on the min folio order and not the PAGE_SIZE as we have bs > ps support for block devices[1]. Calculate the upper limit based on the on min folio order. [1] https://lore.kernel.org/linux-block/20250221223823.1680616-1-mcgrof@xxxxxxxxxx/ Reviewed-by: Jan Kara <jack@xxxxxxx> Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx> --- Changes since v1: - Rebased on top of vfs/vfs-6.17.misc as it has a merge conflict. - Added RVB tag from Jan Kara. fs/buffer.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index a14d281c6a74..445df839a0f0 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1121,9 +1121,10 @@ __getblk_slow(struct block_device *bdev, sector_t block, unsigned size, gfp_t gfp) { bool blocking = gfpflags_allow_blocking(gfp); + int blocklog = PAGE_SHIFT + mapping_min_folio_order(bdev->bd_mapping); if (unlikely(size & (bdev_logical_block_size(bdev) - 1) || - (size < 512 || size > PAGE_SIZE))) { + (size < 512 || size > (1U << blocklog)))) { printk(KERN_ERR "getblk(): invalid block size %d requested\n", size); printk(KERN_ERR "logical block size: %d\n", base-commit: 6ae58121126dcf8efcc2611f216a36a5e50b8ad9 -- 2.49.0
