CVS commit: src/external/cddl/osnet/dist/uts/common/fs/zfs

["YAMAMOTO Takashi" <yamt%netbsd.org@localhost>]

Module Name:    src
Committed By:   yamt
Date:           Sun Mar  1 13:54:31 UTC 2026

Modified Files:
        src/external/cddl/osnet/dist/uts/common/fs/zfs: zfs_vnops.c

Log Message:
zfs: fix data loss with some combinations of mmap and write

in write(), make a mmap page clean only when we are overwriting the
whole page. otherwise, modifications made via mmap which are outside
the overwritten region will be lost.

tested with https://github.com/yamt/garbage/blob/master/c/ubc/ubctest.c


To generate a diff of this commit:
cvs rdiff -u -r1.83 -r1.84 \
    src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vnops.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.