Commits on Nov 23, 2023

1. [LibOS] Update mmaped regions when writing to files …

   Previously, Gramine didn't propagate changes to a mmaped file back to
   memory. This is unexpected for apps that use both mmap and read/write on
   the same file (e.g., etcd-io/bbolt has such implementation to write data
   via `write()` and read it via the mmaped memory).
   
   This commit introduces the reloading of affected mmaped regions on
   `chroot_encrypted`, `chroot` and `tmpfs` file writes. To reduce
   performance penalty in normal cases (where apps use either `write()` or
   `mmap()`), this commit also creates a new field in the inode to record
   the number of mmaped regions of this file. We hence simply check on this
   field to determine whether to perform the reloading to make the overhead
   negligible if none mmaped.
   
   Signed-off-by: Kailun Qin <kailun.qin@intel.com>

   

   kailun-qin committed Nov 23, 2023
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