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| author | Jens Axboe <axboe@fb.com> | 2014-06-24 16:22:24 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-06-24 16:22:24 -0600 |
| commit | 66cb45aa41315d1d9972cada354fbdf7870d7714 (patch) | |
| tree | 5ca5ef3c31f24a7a11989d8a6a163eed9aaf9528 /include/linux/bio.h | |
| parent | 3a4b0eda8e4b27e6aca86f9f4d327c1070815e30 (diff) | |
| download | linux-66cb45aa41315d1d9972cada354fbdf7870d7714.tar.gz linux-66cb45aa41315d1d9972cada354fbdf7870d7714.tar.bz2 linux-66cb45aa41315d1d9972cada354fbdf7870d7714.zip | |
block: add support for limiting gaps in SG lists
Another restriction inherited for NVMe - those devices don't support
SG lists that have "gaps" in them. Gaps refers to cases where the
previous SG entry doesn't end on a page boundary. For NVMe, all SG
entries must start at offset 0 (except the first) and end on a page
boundary (except the last).
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/bio.h')
| -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 f91decbca96b..d2633ee099d9 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -186,6 +186,15 @@ static inline void *bio_data(struct bio *bio) #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) +/* + * Check if adding a bio_vec after bprv with offset would create a gap in + * the SG list. Most drivers don't care about this, but some do. + */ +static inline bool bvec_gap_to_prev(struct bio_vec *bprv, unsigned int offset) +{ + return offset || ((bprv->bv_offset + bprv->bv_len) & (PAGE_SIZE - 1)); +} + #define bio_io_error(bio) bio_endio((bio), -EIO) /* |