https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195972
Bug ID: 195972
Summary: mmap write (to a zfs filesystem) does not update file
modification time
Product: Base System
Version: 10.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Scenario:
- amd64 machine
- a program mmaps a file of approximately 250G size and writes to various
locations
Result:
- The program exits cleanly
- The data has been written (this has been verified)
- The file's modification time has *not* changed
Expected result:
- The file's modification time reflects the time of the last write to the
file.
Notes:
- This worked correctly on FreeBSD 9.2, with the exact same program binary
(no recompile since).
- The binary only links against /lib/libc.so.7.
- There has even been a reboot of the machine, and the file's modification
time still has not changed although the data has been written.
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