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authorMichael Pratt <mpratt@google.com>2019-06-27 14:22:40 -0700
committergVisor bot <gvisor-bot@google.com>2019-06-27 14:24:03 -0700
commit085a907565921e84f59dfeb51da49af2d7c36c40 (patch)
treeaef4e9fef70d282291b8efeb5e675bd6085b22cc /test/syscalls/linux/getcpu.cc
parente2760839033618410cdea9aeab039e096cde54be (diff)
Cache directory entries in the overlay
Currently, the overlay dirCache is only used for a single logical use of getdents. i.e., it is discard when the FD is closed or seeked back to the beginning. But the initial work of getting the directory contents can be quite expensive (particularly sorting large directories), so we should keep it as long as possible. This is very similar to the readdirCache in fs/gofer. Since the upper filesystem does not have to allow caching readdir entries, the new CacheReaddir MountSourceOperations method controls this behavior. This caching should be trivially movable to all Inodes if desired, though that adds an additional copy step for non-overlay Inodes. (Overlay Inodes already do the extra copy). PiperOrigin-RevId: 255477592
Diffstat (limited to 'test/syscalls/linux/getcpu.cc')
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