nfsd: reduce want-write range in nfsd4_create_file()

nfsd4_create_file() needs write access to the mount for two purposes:

1/ to create/open the file.
2/ to set attributes on the newly created (or pre-existing) file.

Currently this is all handled by holding the write access across the
open and the setattr.  A subsequent patch will necessarily change how
write access is gained for the open.  So we reduce the range for the
first want_write, and add another one to cover setattr.  If we failed to
get write access, it is only fatal if there were attrs to set.

We call nfsd_create_setattr() if at all possible, even when no attrs, as
it also calls commit_metadata and we need to be certain that the file
creation has been synced.  If the mount became read-only since the
creation happened, we can safely assume that the sync happened as part
of that.

Signed-off-by: NeilBrown <neil@brown.name>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260717093001.1972119-16-neilb@ownmail.net
Signed-off-by: Chuck Lever <cel@kernel.org>

0 files changed, 0 insertions, 0 deletions