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Date: Mon, 19 Apr 2010 14:37:41 +0200
From: Jan Blunck <jblunck@...e.de>
To: "J. Bruce Fields" <bfields@...ldses.org>
Cc: Valerie Aurora <vaurora@...hat.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
David Woodhouse <dwmw2@...radead.org>,
linux-nfs@...r.kernel.org, Neil Brown <neilb@...e.de>
Subject: Re: [PATCH 04/35] whiteout/NFSD: Don't return information about whiteouts to userspace
On Fri, Apr 16, J. Bruce Fields wrote:
> Seems OK. (Though is there any way we could avoid having to add the
> check to every filldir callback? Isn't the default going to be
> disinterest in whiteouts? How are we avoiding all the same checks in
> the case of lookup?)
>
Bruce,
the alternative would be to include the check in the fs readdir()
implementation, and therefore prevent the call of the filler. I think this
patch would be even bigger.
Jan
> --b.
>
> On Thu, Apr 15, 2010 at 04:04:11PM -0700, Valerie Aurora wrote:
> > From: Jan Blunck <jblunck@...e.de>
> >
> > Userspace isn't ready for handling another file type, so silently drop
> > whiteout directory entries before they leave the kernel.
> >
> > Signed-off-by: Jan Blunck <jblunck@...e.de>
> > Signed-off-by: David Woodhouse <dwmw2@...radead.org>
> > Signed-off-by: Valerie Aurora <vaurora@...hat.com>
> > Cc: linux-nfs@...r.kernel.org
> > Cc: "J. Bruce Fields" <bfields@...ldses.org>
> > Cc: Neil Brown <neilb@...e.de>
> > ---
> > fs/compat.c | 9 +++++++++
> > fs/nfsd/nfs3xdr.c | 5 +++++
> > fs/nfsd/nfs4xdr.c | 5 +++++
> > fs/nfsd/nfsxdr.c | 4 ++++
> > fs/readdir.c | 9 +++++++++
> > 5 files changed, 32 insertions(+), 0 deletions(-)
> >
> > diff --git a/fs/compat.c b/fs/compat.c
> > index 00d90c2..624e1a5 100644
> > --- a/fs/compat.c
> > +++ b/fs/compat.c
> > @@ -838,6 +838,9 @@ static int compat_fillonedir(void *__buf, const char *name, int namlen,
> > struct compat_old_linux_dirent __user *dirent;
> > compat_ulong_t d_ino;
> >
> > + if (d_type == DT_WHT)
> > + return 0;
> > +
> > if (buf->result)
> > return -EINVAL;
> > d_ino = ino;
> > @@ -909,6 +912,9 @@ static int compat_filldir(void *__buf, const char *name, int namlen,
> > compat_ulong_t d_ino;
> > int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
> >
> > + if (d_type == DT_WHT)
> > + return 0;
> > +
> > buf->error = -EINVAL; /* only used if we fail.. */
> > if (reclen > buf->count)
> > return -EINVAL;
> > @@ -998,6 +1004,9 @@ static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t
> > int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
> > u64 off;
> >
> > + if (d_type == DT_WHT)
> > + return 0;
> > +
> > buf->error = -EINVAL; /* only used if we fail.. */
> > if (reclen > buf->count)
> > return -EINVAL;
> > diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
> > index 2a533a0..9b96f5a 100644
> > --- a/fs/nfsd/nfs3xdr.c
> > +++ b/fs/nfsd/nfs3xdr.c
> > @@ -885,6 +885,11 @@ encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
> > int elen; /* estimated entry length in words */
> > int num_entry_words = 0; /* actual number of words */
> >
> > + if (d_type == DT_WHT) {
> > + cd->common.err = nfs_ok;
> > + return 0;
> > + }
> > +
> > if (cd->offset) {
> > u64 offset64 = offset;
> >
> > diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> > index 78c7e24..8839ba8 100644
> > --- a/fs/nfsd/nfs4xdr.c
> > +++ b/fs/nfsd/nfs4xdr.c
> > @@ -2268,6 +2268,11 @@ nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
> > return 0;
> > }
> >
> > + if (d_type == DT_WHT) {
> > + cd->common.err = nfs_ok;
> > + return 0;
> > + }
> > +
> > if (cd->offset)
> > xdr_encode_hyper(cd->offset, (u64) offset);
> >
> > diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
> > index 4ce005d..0e57d4b 100644
> > --- a/fs/nfsd/nfsxdr.c
> > +++ b/fs/nfsd/nfsxdr.c
> > @@ -503,6 +503,10 @@ nfssvc_encode_entry(void *ccdv, const char *name,
> > namlen, name, offset, ino);
> > */
> >
> > + if (d_type == DT_WHT) {
> > + cd->common.err = nfs_ok;
> > + return 0;
> > + }
> > if (offset > ~((u32) 0)) {
> > cd->common.err = nfserr_fbig;
> > return -EINVAL;
> > diff --git a/fs/readdir.c b/fs/readdir.c
> > index 7723401..3a48491 100644
> > --- a/fs/readdir.c
> > +++ b/fs/readdir.c
> > @@ -77,6 +77,9 @@ static int fillonedir(void * __buf, const char * name, int namlen, loff_t offset
> > struct old_linux_dirent __user * dirent;
> > unsigned long d_ino;
> >
> > + if (d_type == DT_WHT)
> > + return 0;
> > +
> > if (buf->result)
> > return -EINVAL;
> > d_ino = ino;
> > @@ -154,6 +157,9 @@ static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
> > unsigned long d_ino;
> > int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(long));
> >
> > + if (d_type == DT_WHT)
> > + return 0;
> > +
> > buf->error = -EINVAL; /* only used if we fail.. */
> > if (reclen > buf->count)
> > return -EINVAL;
> > @@ -239,6 +245,9 @@ static int filldir64(void * __buf, const char * name, int namlen, loff_t offset,
> > struct getdents_callback64 * buf = (struct getdents_callback64 *) __buf;
> > int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(u64));
> >
> > + if (d_type == DT_WHT)
> > + return 0;
> > +
> > buf->error = -EINVAL; /* only used if we fail.. */
> > if (reclen > buf->count)
> > return -EINVAL;
> > --
> > 1.6.3.3
> >
--
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