diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/blkdev_compat.h | 57 |
1 files changed, 48 insertions, 9 deletions
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h index 1f90b9825..8de0669ca 100644 --- a/include/linux/blkdev_compat.h +++ b/include/linux/blkdev_compat.h @@ -303,19 +303,58 @@ bio_set_flags_failfast(struct block_device *bdev, int *flags) #endif /* HAVE_BDEV_LOGICAL_BLOCK_SIZE */ #endif /* HAVE_BDEV_PHYSICAL_BLOCK_SIZE */ +#ifndef HAVE_BIO_SET_OP_ATTRS /* - * 2.6.37 API change - * The WRITE_FLUSH, WRITE_FUA, and WRITE_FLUSH_FUA flags have been - * introduced as a replacement for WRITE_BARRIER. This was done to - * allow richer semantics to be expressed to the block layer. It is - * the block layers responsibility to choose the correct way to - * implement these semantics. + * Kernels without bio_set_op_attrs use bi_rw for the bio flags. */ -#ifdef WRITE_FLUSH_FUA -#define VDEV_WRITE_FLUSH_FUA WRITE_FLUSH_FUA +static inline void +bio_set_op_attrs(struct bio *bio, unsigned rw, unsigned flags) +{ + bio->bi_rw |= rw | flags; +} +#endif + +/* + * bio_set_flush - Set the appropriate flags in a bio to guarantee + * data are on non-volatile media on completion. + * + * 2.6.X - 2.6.36 API, + * WRITE_BARRIER - Tells the block layer to commit all previously submitted + * writes to stable storage before this one is started and that the current + * write is on stable storage upon completion. Also prevents reordering + * on both sides of the current operation. + * + * 2.6.37 - 4.8 API, + * Introduce WRITE_FLUSH, WRITE_FUA, and WRITE_FLUSH_FUA flags as a + * replacement for WRITE_BARRIER to allow expressing richer semantics + * to the block layer. It's up to the block layer to implement the + * semantics correctly. Use the WRITE_FLUSH_FUA flag combination. + * + * 4.8 - 4.9 API, + * REQ_FLUSH was renamed to REQ_PREFLUSH. For consistency with previous + * ZoL releases, prefer the WRITE_FLUSH_FUA flag set if it's available. + * + * 4.10 API, + * The read/write flags and their modifiers, including WRITE_FLUSH, + * WRITE_FUA and WRITE_FLUSH_FUA were removed from fs.h in + * torvalds/linux@70fd7614 and replaced by direct flag modification + * of the REQ_ flags in bio->bi_opf. Use REQ_PREFLUSH. + */ +static inline void +bio_set_flush(struct bio *bio) +{ +#if defined(WRITE_BARRIER) /* < 2.6.37 */ + bio_set_op_attrs(bio, 0, WRITE_BARRIER); +#elif defined(WRITE_FLUSH_FUA) /* >= 2.6.37 and <= 4.9 */ + bio_set_op_attrs(bio, 0, WRITE_FLUSH_FUA); +#elif defined(REQ_PREFLUSH) /* >= 4.10 */ + bio_set_op_attrs(bio, 0, REQ_PREFLUSH); #else -#define VDEV_WRITE_FLUSH_FUA WRITE_BARRIER +#error "Allowing the build will cause bio_set_flush requests to be ignored." + "Please file an issue report at: " + "https://github.com/zfsonlinux/zfs/issues/new" #endif +} /* * 4.8 - 4.x API, |