diff options
| author | Keith Busch <kbusch@kernel.org> | 2023-12-01 00:53:06 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-12-02 04:29:00 +0300 |
| commit | 492c5d455969fc2e829f26ed4c83487b068f0dd7 (patch) | |
| tree | 534ffa3ff669b48264aaaf87376ab87007947657 /include | |
| parent | 668bfeeabb5e402e3b36992f7859c284cc6e594d (diff) | |
| download | linux-492c5d455969fc2e829f26ed4c83487b068f0dd7.tar.xz | |
block: bio-integrity: directly map user buffers
Passthrough commands that utilize metadata currently need to bounce the
user space buffer through the kernel. Add support for mapping user space
directly so that we can avoid this costly overhead. This is similar to
how the normal bio data payload utilizes user addresses with
bio_map_user_iov().
If the user address can't directly be used for reason, like too many
segments or address unalignement, fallback to a copy of the user vec
while keeping the user address pinned for the IO duration so that it
can safely be copied on completion in any process context.
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20231130215309.2923568-2-kbusch@meta.com
[axboe: fold in fix from Kanchan Joshi]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bio.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 41d417ee1349..ec4db73e5f4e 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -324,6 +324,8 @@ enum bip_flags { BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ + BIP_INTEGRITY_USER = 1 << 5, /* Integrity payload is user address */ + BIP_COPY_USER = 1 << 6, /* Kernel bounce buffer in use */ }; /* @@ -718,6 +720,7 @@ static inline bool bioset_initialized(struct bio_set *bs) for_each_bio(_bio) \ bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) +int bio_integrity_map_user(struct bio *bio, void __user *ubuf, ssize_t len, u32 seed); extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); extern bool bio_integrity_prep(struct bio *); @@ -789,6 +792,12 @@ static inline int bio_integrity_add_page(struct bio *bio, struct page *page, return 0; } +static inline int bio_integrity_map_user(struct bio *bio, void __user *ubuf, + ssize_t len, u32 seed) +{ + return -EINVAL; +} + #endif /* CONFIG_BLK_DEV_INTEGRITY */ /* |