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.
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| @@ -55,7 +55,10 @@ struct nvme_passthru_cmd64 { · 54 unmodified lines | |||
| 55 | __u64 metadata; | 55 | __u64 metadata; |
| 56 | __u64 addr; | 56 | __u64 addr; |
| 57 | __u32 metadata_len; | 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 | __u32 cdw10; | 62 | __u32 cdw10; |
| 60 | __u32 cdw11; | 63 | __u32 cdw11; |
| 61 | __u32 cdw12; | 64 | __u32 cdw12; |
| @@ -78,5 +81,6 @@ struct nvme_passthru_cmd64 { · 16 unmodified lines | |||
| 78 | #define NVME_IOCTL_RESCAN _IO('N', 0x46) | 81 | #define NVME_IOCTL_RESCAN _IO('N', 0x46) |
| 79 | #define NVME_IOCTL_ADMIN64_CMD _IOWR('N', 0x47, struct nvme_passthru_cmd64) | 82 | #define NVME_IOCTL_ADMIN64_CMD _IOWR('N', 0x47, struct nvme_passthru_cmd64) |
| 80 | #define NVME_IOCTL_IO64_CMD _IOWR('N', 0x48, struct nvme_passthru_cmd64) | 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 | #endif /* _UAPI_LINUX_NVME_IOCTL_H */ | 86 | #endif /* _UAPI_LINUX_NVME_IOCTL_H */ |