---
- branch: MAIN
  date: Wed Mar  2 04:11:41 UTC 2022
  files:
  - new: '1.30'
    old: '1.29'
    path: src/usr.sbin/puffs/mount_9p/node.c
    pathrev: src/usr.sbin/puffs/mount_9p/node.c@1.30
    type: modified
  id: 20220302T041141Z.b550946154291891658dbd41bd44b45eed976991
  log: |
    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.
  module: src
  subject: 'CVS commit: src/usr.sbin/puffs/mount_9p'
  unixtime: '1646194301'
  user: ozaki-r