Fix compilation error with target_env=ohos

OpenHarmony(alias ohos) is tie 3 supported target for rust.
see rust-lang/compiler-team#568.

In implementation it sits close to musl instead of bionic
and napi instead jni when comparing with android.

Tested with:
- cargo build --target x86_64-unknown-linux-ohos --features acct,dir,env,fs
- cargo build --target aarch64-unknown-linux-ohos --features acct,dir,env,fs

src/fcntl.rs

@@ -126,7 +126,7 @@ libc_bitflags!(
         O_EXLOCK;
         /// Same as `O_SYNC`.
         #[cfg(any(bsd,
-                  all(target_os = "linux", not(target_env = "musl")),
+                  all(target_os = "linux", not(target_env = "musl"), not(target_env = "ohos")),
                   target_os = "redox"))]
         O_FSYNC;
         /// Allow files whose sizes can't be represented in an `off_t` to be opened.

src/sys/statfs.rs

@@ -55,13 +55,16 @@ type fs_type_t = libc::c_ulong;
 type fs_type_t = libc::c_uint;
 #[cfg(all(target_os = "linux", target_env = "musl"))]
 type fs_type_t = libc::c_ulong;
+#[cfg(all(target_os = "linux", target_env = "ohos"))]
+type fs_type_t = libc::c_ulong;
 #[cfg(all(target_os = "linux", target_env = "uclibc"))]
 type fs_type_t = libc::c_int;
 #[cfg(all(
     target_os = "linux",
     not(any(
         target_arch = "s390x",
         target_env = "musl",
+        target_env = "ohos",
         target_env = "uclibc"
     ))
 ))]
@@ -73,6 +76,7 @@ type fs_type_t = libc::__fsword_t;
     target_os = "android",
     all(target_os = "linux", target_arch = "s390x"),
     all(target_os = "linux", target_env = "musl"),
+    all(target_os = "linux", target_env = "ohos"),
     all(
         target_os = "linux",
         not(any(target_arch = "s390x", target_env = "musl"))
@@ -279,7 +283,7 @@ pub const XENFS_SUPER_MAGIC: FsType =
 #[cfg(linux_android)]
 #[allow(missing_docs)]
 pub const NSFS_MAGIC: FsType = FsType(libc::NSFS_MAGIC as fs_type_t);
-#[cfg(all(linux_android, not(target_env = "musl")))]
+#[cfg(all(linux_android, not(target_env = "musl"), not(target_env = "ohos")))]
 #[allow(missing_docs)]
 pub const XFS_SUPER_MAGIC: FsType = FsType(libc::XFS_SUPER_MAGIC as fs_type_t);
 
@@ -322,7 +326,8 @@ impl Statfs {
     /// Optimal transfer block size
     #[cfg(any(
         target_os = "android",
-        all(target_os = "linux", target_env = "musl")
+        all(target_os = "linux", target_env = "musl"),
+        all(target_os = "linux", target_env = "ohos")
     ))]
     pub fn optimal_transfer_size(&self) -> libc::c_ulong {
         self.0.f_bsize
@@ -334,6 +339,7 @@ impl Statfs {
         not(any(
             target_arch = "s390x",
             target_env = "musl",
+            target_env = "ohos",
             target_env = "uclibc"
         ))
     ))]
@@ -379,6 +385,13 @@ impl Statfs {
         self.0.f_bsize
     }
 
+    /// Size of a block
+    // f_bsize on linux: https://github.com/torvalds/linux/blob/master/fs/nfs/super.c#L471
+    #[cfg(all(target_os = "linux", target_env = "ohos"))]
+    pub fn block_size(&self) -> libc::c_ulong {
+        self.0.f_bsize
+    }
+
     /// Size of a block
     // f_bsize on linux: https://github.com/torvalds/linux/blob/master/fs/nfs/super.c#L471
     #[cfg(all(target_os = "linux", target_env = "uclibc"))]
@@ -393,6 +406,7 @@ impl Statfs {
         not(any(
             target_arch = "s390x",
             target_env = "musl",
+            target_env = "ohos",
             target_env = "uclibc"
         ))
     ))]
@@ -463,6 +477,7 @@ impl Statfs {
         not(any(
             target_arch = "s390x",
             target_env = "musl",
+            target_env = "ohos",
             target_env = "uclibc"
         ))
     ))]

src/sys/statvfs.rs

@@ -48,7 +48,7 @@ libc_bitflags!(
         #[cfg(linux_android)]
         ST_NODIRATIME;
         /// Update access time relative to modify/change time
-        #[cfg(any(target_os = "android", all(target_os = "linux", not(target_env = "musl"))))]
+        #[cfg(any(target_os = "android", all(target_os = "linux", not(target_env = "musl"), not(target_env = "ohos"))))]
         ST_RELATIME;
     }
 );