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Update UsrbIo.md (#94)

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Yuheng Zou 2025-03-05 14:56:13 +08:00 committed by GitHub
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src/lib/api/UsrbIo.md
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@ -63,19 +63,18 @@ void hf3fs_destroy(struct hf3fs_ior *ior);
#### Parameters
- **ior**: Address for Ior.
### hf3fs_iovcreate2
### hf3fs_iovcreate
#### Summary
Create an Iov instance and allocate shared memory for that Iov. All `hf3fs_iovcreate*` functions create Iov instances, but include various configurable parameters due to compatibility considerations.
Create an Iov instance and allocate shared memory for that Iov.
#### Syntax
```c
int hf3fs_iovcreate2(struct hf3fs_iov *iov,
const char *hf3fs_mount_point,
size_t size,
size_t block_size,
int numa,
const char *shm_path);
int hf3fs_iovcreate(struct hf3fs_iov *iov,
const char *hf3fs_mount_point,
size_t size,
size_t block_size,
int numa);
```
#### Parameters
@ -84,7 +83,6 @@ int hf3fs_iovcreate2(struct hf3fs_iov *iov,
- **size**: Shared memory size for this Iov.
- **block_size**: If not `0`, this function will allocate multiple shared memory blocks, each sized no larger than `block_size`. `0` for allocate a single large shared memory. All IOs on this Iov should not span across the block margin. This parameter is for optimization on IB register time.
- **numa**: Numa ID for Ior shared memory. `-1` for current process numa ID.
- **shm_path**: Path of `tmpfs` mount point for shared memory allocation. If `nullptr`, use the default `/dev/shm`.
#### Return Value
- If success, return 0.
@ -93,7 +91,7 @@ int hf3fs_iovcreate2(struct hf3fs_iov *iov,
#### Example
```c
struct hf3fs_iov iov;
hf3fs_iovcreate2(&iov, "/hf3fs/mount/point", 1 << 30, 0, -1, nullptr);
hf3fs_iovcreate(&iov, "/hf3fs/mount/point", 1 << 30, 0, -1);
hf3fs_iovdestroy(&iov);
```
@ -254,7 +252,7 @@ int main() {
hf3fs_iorcreate4(&ior, "/hf3fs/mount/point", NUM_IOS, true, 0, 0, -1, 0);
struct hf3fs_iov iov;
hf3fs_iovcreate2(&iov, "/hf3fs/mount/point", NUM_IOS * BLOCK_SIZE, 0, -1, nullptr);
hf3fs_iovcreate(&iov, "/hf3fs/mount/point", NUM_IOS * BLOCK_SIZE, 0, -1);
int fd = open("/hf3fs/mount/point/example.bin", O_RDONLY);
hf3fs_reg_fd(fd, 0);