hi,all
now,we test the directory operation in ceph,and found follow phenomenons:
we mount ceph on /mnt/test/
then create dir "/mnt/test/a/b/"
1) in dir "b" , use "seq 3000|xargs -i mkdir {}" to create 3000 dirs
2) and at some time,make a directory "c" in "a"
then step 2) returns very slow,from the debug log,we got :
step 2) will block until step 1) finished
because step 2) need a sync wrlock of dir "a", but step 1) got the
wrlock in predirectory_journal_parents function
until it finished works .
so i have few questions:
a) why step 1) got the wrlock of dir "a" ? I think it should just
hold the wrlock of dir "b",but not dir "a".
b) why circularly judge the variable "stop" value of all the
parent directory of dir "b" ?
best regards!
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