site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Hi Jens —

On Jan 20, 2019, at 3:14 PM, Jens Alfke <jens@mooseyard.com> wrote:

I’m looking into sparse-file operations in APFS. I see I can use fcntl to preallocate space and to punch holes in a file. But I don’t see a command to remove a byte range from a file without leaving a hole, equivalent to the FALLOC_FL_COLLAPSE_RANGE mode of Linux’s fallocate, described thus:

...

Specifying the FALLOC_FL_COLLAPSE_RANGE flag (available since Linux 3.15) in mode removes a byte range from a file, without leaving a hole. The byte range to be collapsed starts at offset and continues for len bytes. At the completion of the operation, the contents of the file starting at the location offset+len will be appended at the location offset, and the file will be len bytes smaller.

Is there such an operation in Darwin, with an APFS filesystem?

No, but you can file a Radar bug asking for the feature and we can evaluate it for inclusion. Thanks, — Chris ------------------ 19191 Vallco Parkway M/S 77-1SSG Cupertino CA 95014 phone: (408) 974-4033 fax: (408) 862-7577 email: sarcone@apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app... This email sent to site_archiver@lists.apple.com