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| -rw-r--r-- | CHANGELOG.md | 2 | ||||
| -rw-r--r-- | src/fcntl.rs | 40 |
2 files changed, 42 insertions, 0 deletions
diff --git a/CHANGELOG.md b/CHANGELOG.md index beacb282..664fdaff 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -32,6 +32,8 @@ This project adheres to [Semantic Versioning](http://semver.org/). ([#663](https://github.com/nix-rust/nix/pull/663)) - Added more accessor methods for `AioCb` ([#773](https://github.com/nix-rust/nix/pull/773)) +- Add nix::sys::fallocate + ([#768](https:://github.com/nix-rust/nix/pull/768)) ### Changed - Renamed existing `ptrace` wrappers to encourage namespacing ([#692](https://github.com/nix-rust/nix/pull/692)) diff --git a/src/fcntl.rs b/src/fcntl.rs index 003c316c..f99036d6 100644 --- a/src/fcntl.rs +++ b/src/fcntl.rs @@ -341,3 +341,43 @@ pub fn vmsplice(fd: RawFd, iov: &[IoVec<&[u8]>], flags: SpliceFFlags) -> Result< Errno::result(ret).map(|r| r as usize) } +#[cfg(any(target_os = "linux"))] +libc_bitflags!( + /// Mode argument flags for fallocate determining operation performed on a given range. + pub struct FallocateFlags: libc::c_int { + /// File size is not changed. + /// + /// offset + len can be greater than file size. + FALLOC_FL_KEEP_SIZE; + /// Deallocates space by creating a hole. + /// + /// Must be ORed with FALLOC_FL_KEEP_SIZE. Byte range starts at offset and continues for len bytes. + FALLOC_FL_PUNCH_HOLE; + /// Removes byte range from a file without leaving a hole. + /// + /// Byte range to collapse starts at offset and continues for len bytes. + FALLOC_FL_COLLAPSE_RANGE; + /// Zeroes space in specified byte range. + /// + /// Byte range starts at offset and continues for len bytes. + FALLOC_FL_ZERO_RANGE; + /// Increases file space by inserting a hole within the file size. + /// + /// Does not overwrite existing data. Hole starts at offset and continues for len bytes. + FALLOC_FL_INSERT_RANGE; + /// Shared file data extants are made private to the file. + /// + /// Gaurantees that a subsequent write will not fail due to lack of space. + FALLOC_FL_UNSHARE_RANGE; + } +); + +/// Manipulates file space. +/// +/// Allows the caller to directly manipulate the allocated disk space for the +/// file referred to by fd. +#[cfg(any(target_os = "linux"))] +pub fn fallocate(fd: RawFd, mode: FallocateFlags, offset: libc::off_t, len: libc::off_t) -> Result<c_int> { + let res = unsafe { libc::fallocate(fd, mode.bits(), offset, len) }; + Errno::result(res) +} |