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nvmet-file: clamp-down file namespace lba_shift

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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 <sagi@grimberg.me>
Reviewed-by:- Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sagi Grimberg 2019-04-24 11:43:23 -07:00 committed by Christoph Hellwig
parent a5dffbb66d
commit 525ec495e0
1 changed files with 6 additions and 1 deletions
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7
drivers/nvme/target/io-cmd-file.c
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@ -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),