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Subject[PATCH -V19 00/15] Generic name to handle and open by handle syscalls

The below set of patches implement open by handle support using exportfs
operations. This allows user space application to map a file name to file
handle and later open the file using handle. This should be usable
for userspace NFS [1] and 9P server [2]. XFS already support this with the ioctls


git repo for the patchset at:
git:// open-by-handle

Test case can be found at

Changes from V18:
a) Drop open on symlink patch
b) Drop other patches that added support for NULL pathname in *at syscalls
c) Add new handle based syscalls. All of them are restricted to CAP_DAC_READ_SEARCH


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