[NFS-Ganesha-Devel] Change in ...nfs-ganesha[next]: Fix stall when readdir races with I/O and a new mdcache entry created

Frank Filz has uploaded this change for review. ( https://review.gerrithub.io/c/ffilz/nfs-ganesha/+/514964 ) Change subject: Fix stall when readdir races with I/O and a new mdcache entry created ...................................................................... Fix stall when readdir races with I/O and a new mdcache entry created If readdir causes a new mdcache entry to be created and that races with I/O on another instance of the cache entry, which thus requires merge_share to resolve the share reservation, the need to take the obj_lock for write blocks while the I/O completes while holding the lock for read. In this case, there's actually no need to do anything in merge_share because all the counters in the readdir's copy of the obj handle are 0. Since that copy of the obj handle MUST not accessible to any other thread, it can be accessed without holding the lock. So we move acquiring and releasing the lock into merge_share and check that the dupe_share has non-zero counters before taking the lock. Change-Id: I372713360a5c795f77b1365c263c66302ec2490a Signed-off-by: Frank S. Filz <ffilzlnx(a)mindspring.com&gt; --- M src/FSAL/FSAL_CEPH/handle.c M src/FSAL/FSAL_GLUSTER/handle.c M src/FSAL/FSAL_GPFS/file.c M src/FSAL/FSAL_KVSFS/kvsfs_handle.c M src/FSAL/FSAL_LIZARDFS/handle.c M src/FSAL/FSAL_MEM/mem_handle.c M src/FSAL/FSAL_RGW/handle.c M src/FSAL/FSAL_VFS/file.c M src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c M src/FSAL/commonlib.c M src/include/FSAL/fsal_commonlib.h 11 files changed, 53 insertions(+), 53 deletions(-) git pull ssh://review.gerrithub.io:29418/ffilz/nfs-ganesha refs/changes/64/514964/1 -- To view, visit https://review.gerrithub.io/c/ffilz/nfs-ganesha/+/514964 To unsubscribe, or for help writing mail filters, visit https://review.gerrithub.io/settings Gerrit-Project: ffilz/nfs-ganesha Gerrit-Branch: next Gerrit-Change-Id: I372713360a5c795f77b1365c263c66302ec2490a Gerrit-Change-Number: 514964 Gerrit-PatchSet: 1 Gerrit-Owner: Frank Filz <ffilzlnx(a)mindspring.com&gt; Gerrit-MessageType: newchange