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memfd: add file support

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See "man memfd_create" for more information of what memfd is.

This adds support for memfd open files, that are not not memory mapped.

* We add a new kind of file: MEMFD.
* We add two image types MEMFD_FILE, and MEMFD_INODE.
  MEMFD_FILE contains usual file information (e.g., position).
  MEMFD_INODE contains the memfd name, and a shmid identifier
  referring to the content.
* We reuse the shmem facilities for dumping memfd content as it
  would be easier to support incremental checkpoints in the future.

Signed-off-by: Nicolas Viennot <Nicolas.Viennot@twosigma.com>
This commit is contained in:
Nicolas Viennot 2019-12-18 23:32:32 +00:00 • committed by Andrei Vagin
parent 5dbc24b206
commit c1e72aa936
18 changed files with 503 additions and 9 deletions
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2
Makefile.config
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@ -64,7 +64,7 @@ export DEFINES += $(FEATURE_DEFINES)
export CFLAGS += $(FEATURE_DEFINES)
FEATURES_LIST := TCP_REPAIR STRLCPY STRLCAT PTRACE_PEEKSIGINFO \
SETPROCTITLE_INIT MEMFD TCP_REPAIR_WINDOW FSCONFIG
SETPROCTITLE_INIT MEMFD TCP_REPAIR_WINDOW FSCONFIG MEMFD_CREATE
# $1 - config name
define gen-feature-test