Unionfs: copyup only if file is being written to
authorErez Zadok <ezk@cs.sunysb.edu>
Tue, 15 Apr 2008 17:11:04 +0000 (13:11 -0400)
committerErez Zadok <ezk@cs.sunysb.edu>
Wed, 30 Mar 2011 23:21:38 +0000 (19:21 -0400)
commit0ae2de04d64de5d65aa91370542ca29d3253b201
tree9da621ac1118badac8d3ede3661294af3f06194a
parent5e3eb07a1b6af5d4289660ad378efffb0bdf015a
Unionfs: copyup only if file is being written to

Before, we used to copyup on an open(2) call which used flags implying
writing (O_RDWR, O_WRONLY, O_APPEND).  This meant that a file being opened
for writing, then immediately closed (without actually writing to the file),
will still have been copied up.  Now, we don't copyup such files in ->open,
but defer the copyup till later. [Bug #591].

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
fs/unionfs/commonfops.c
fs/unionfs/file.c
fs/unionfs/union.h