From 525ec495e021068aa8635a0e18ff60695f5b1f4f Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Wed, 24 Apr 2019 11:43:23 -0700 Subject: nvmet-file: clamp-down file namespace lba_shift When the backing file is a tempfile for example, the inode i_blkbits can be 1M in size which causes problems for hosts to support as the disk block size. Instead, expose the minimum between i_blkbits and 12 (4K sector size). Signed-off-by: Sagi Grimberg Reviewed-by:- Chaitanya Kulkarni Signed-off-by: Christoph Hellwig --- drivers/nvme/target/io-cmd-file.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/nvme') diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c index bc6ebb51b0bf..05453f5d1448 100644 --- a/drivers/nvme/target/io-cmd-file.c +++ b/drivers/nvme/target/io-cmd-file.c @@ -49,7 +49,12 @@ int nvmet_file_ns_enable(struct nvmet_ns *ns) goto err; ns->size = stat.size; - ns->blksize_shift = file_inode(ns->file)->i_blkbits; + /* + * i_blkbits can be greater than the universally accepted upper bound, + * so make sure we export a sane namespace lba_shift. + */ + ns->blksize_shift = min_t(u8, + file_inode(ns->file)->i_blkbits, 12); ns->bvec_cache = kmem_cache_create("nvmet-bvec", NVMET_MAX_MPOOL_BVEC * sizeof(struct bio_vec), -- cgit v1.2.3