Add a new NVME_IOCTL_IO64_CMD_VEC ioctl that works like the existing NVME_IOCTL_IO64_CMD ioctl except that it takes and array of iovecs and thus supports vectored I/O. - cmd.addr is base address of user iovec array - cmd.vec_cnt is count of iovec array elements This patch does not include vectored-variant for admin-commands as most of them are light on buffers and likely to have low invocation frequency.
Showing the changes to include/uapi (1 of 2 files). Show all
Unified · Split
| @@ -55,7 +55,10 @@ struct nvme_passthru_cmd64 { · 54 unmodified lines | ||
| 55 | 55 | __u64 metadata; |
| 56 | 56 | __u64 addr; |
| 57 | 57 | __u32 metadata_len; |
| 58 | − __u32 data_len; | |
| 58 | + union { | |
| 59 | + __u32 data_len; /* for non-vectored io */ | |
| 60 | + __u32 vec_cnt; /* for vectored io */ | |
| 61 | + }; | |
| 59 | 62 | __u32 cdw10; |
| 60 | 63 | __u32 cdw11; |
| 61 | 64 | __u32 cdw12; |
| @@ -78,5 +81,6 @@ struct nvme_passthru_cmd64 { · 16 unmodified lines | ||
| 78 | 81 | #define NVME_IOCTL_RESCAN _IO('N', 0x46) |
| 79 | 82 | #define NVME_IOCTL_ADMIN64_CMD _IOWR('N', 0x47, struct nvme_passthru_cmd64) |
| 80 | 83 | #define NVME_IOCTL_IO64_CMD _IOWR('N', 0x48, struct nvme_passthru_cmd64) |
| 84 | +#define NVME_IOCTL_IO64_CMD_VEC _IOWR('N', 0x49, struct nvme_passthru_cmd64) | |
| 81 | 85 | |
| 82 | 86 | #endif /* _UAPI_LINUX_NVME_IOCTL_H */ |