• Eric Van Hensbergen's avatar
    fs/9p: remove writeback fid and fix per-file modes · 1543b4c5
    Eric Van Hensbergen authored
    This patch removes the creating of an additional writeback_fid
    for opened files.  The patch addresses problems when files
    were opened write-only or getattr on files with dirty caches.
    
    This patch also incorporates information about cache behavior
    in the fid for every file.  This allows us to reflect cache
    behavior from mount flags, open mode, and information from
    the server to inform readahead and writeback behavior.
    
    This includes adding support for a 9p semantic that qid.version==0
    is used to mark a file as non-cachable which is important for
    synthetic files.  This may have a side-effect of not supporting
    caching on certain legacy file servers that do not properly set
    qid.version.  There is also now a mount flag which can disable
    the qid.version behavior.
    Signed-off-by: default avatarEric Van Hensbergen <ericvh@kernel.org>
    1543b4c5
vfs_file.c 13.9 KB