path: root/xlators/features/bit-rot/src/bitd/bit-rot.c
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authorEmmanuel Dreyfus <>2015-04-29 15:52:37 +0200
committerVijay Bellur <>2015-05-07 04:37:56 -0700
commitaa938247e19afa419476fb2d0b7cb2d054c6dd47 (patch)
tree5fdf28179cb907f4e29b7246799fef61b0f1c16d /xlators/features/bit-rot/src/bitd/bit-rot.c
parentf93bf09cdb417cf5e09206164a16ad9435285b45 (diff)
Tests: use a portable way to flush kernel cache
On Linux, kernel cache can be flushed using echo 3 > /proc/sys/vm/drop_caches This non-portable approach can be replaced by an on-purpose failed attempt to unmount: if the mount point is the current directory and umount is called, the kernel will flush inodes until it realize it cannot complete the operation because root of filesystem is busy: ( cd $M0 ; umount $M0 ) Unfortunately this does not flush everything. Entries may still be present in the kenrel FUSE cache. Using $GFS to mount the filesystem ensure --entry-timeout=0 and clears this problem. Some stall information may also remain in glusterfs caches, and that may have to be adressed by appropriate volume option. For instance tests/bugs/rpc/bug-954057.t needs to disable performance.stat-prefetch. Qtherwise, root's new credentials are not evaluated after root-quash is enabled. The test could also be done with performance.stat-prefetch enabled using various tricks: copying the file to read, creating a hard link on it, or just waiting long enough for metadata cache to expire. BUG: 1129939 Change-Id: I54929e899d55c04dcd9d947809133549f01fd0e1 Signed-off-by: Emmanuel Dreyfus <> Reviewed-on: Reviewed-by: Dan Lambright <> Tested-by: Gluster Build System <> Reviewed-by: Vijay Bellur <>
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