• David Howells's avatar
    AFS: implement basic file write support · 31143d5d
    David Howells authored
    Implement support for writing to regular AFS files, including:
    
     (1) write
    
     (2) truncate
    
     (3) fsync, fdatasync
    
     (4) chmod, chown, chgrp, utime.
    
    AFS writeback attempts to batch writes into as chunks as large as it can manage
    up to the point that it writes back 65535 pages in one chunk or it meets a
    locked page.
    
    Furthermore, if a page has been written to using a particular key, then should
    another write to that page use some other key, the first write will be flushed
    before the second is allowed to take place.  If the first write fails due to a
    security error, then the page will be scrapped and reread before the second
    write takes place.
    
    If a page is dirty and the callback on it is broken by the server, then the
    dirty data is not discarded (same behaviour as NFS).
    
    Shared-writable mappings are not supported by this patch.
    
    [akpm@linux-foundation.org: fix a bunch of warnings]
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    31143d5d
write.c 19.6 KB