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author | Sanchayan Maity <maitysanchayan@gmail.com> | 2017-10-07 19:13:02 +0530 |
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committer | Sanchayan Maity <maitysanchayan@gmail.com> | 2017-10-07 19:13:02 +0530 |
commit | b85d50147f1f503597d8f54e6be821dfd2379193 (patch) | |
tree | 0def6adfac38b8af0a4270f5511a02ba636d33e6 /src/fcntl.rs | |
parent | 2166e71091d68ce3f1462c78a7f1ede5548c265b (diff) | |
download | nix-b85d50147f1f503597d8f54e6be821dfd2379193.zip |
Add support for 'fallocate'
Diffstat (limited to 'src/fcntl.rs')
-rw-r--r-- | src/fcntl.rs | 40 |
1 files changed, 40 insertions, 0 deletions
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) +} |