CVS commit: src/usr.sbin/puffs/mount_9p

["Ryota Ozaki" <ozaki-r%netbsd.org@localhost>]

Module Name:    src
Committed By:   ozaki-r
Date:           Wed Mar  2 04:11:41 UTC 2022

Modified Files:
        src/usr.sbin/puffs/mount_9p: node.c

Log Message:
mount_9p: fix writing to a file opened with write-only mode

With the page cache, writing data to a file may demand to read contents
from a storage to fill a page in the page cache first.

Opening a file with write-only mode by a user lets a mount_9p process
open a file with write-only mode too at a 9p server.  Thus, a read
request to the file from the page cache fails.

So we need to open a file always with read mode (internally) even if it
is opened with write-only mode by a user.

Note that the change doesn't mean that mount_9p allows users to read
contents from a file that is opened with write-only mode.


To generate a diff of this commit:
cvs rdiff -u -r1.29 -r1.30 src/usr.sbin/puffs/mount_9p/node.c

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