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Date: Sun, 29 Nov 2009 21:53:30 -0500
From: Erez Zadok <ezk@...sunysb.edu>
To: Valerie Aurora <vaurora@...hat.com>
Cc: Jan Blunck <jblunck@...e.de>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christoph Hellwig <hch@...radead.org>,
Andy Whitcroft <apw@...onical.com>,
Scott James Remnant <scott@...onical.com>,
Sandu Popa Marius <sandupopamarius@...il.com>,
Jan Rekorajski <baggins@...h.mimuw.edu.pl>,
"J. R. Okajima" <hooanon05@...oo.co.jp>,
Arnd Bergmann <arnd@...db.de>,
Vladimir Dronnikov <dronnikov@...il.com>,
Felix Fietkau <nbd@...nwrt.org>, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, Jan Blunck <j.blunck@...harburg.de>,
David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 09/41] whiteout: Don't return information about whiteouts to userspace
In message <1256152779-10054-10-git-send-email-vaurora@...hat.com>, Valerie Aurora writes:
> From: Jan Blunck <jblunck@...e.de>
>
> The userspace isn't ready for handling another filetype. Therefore this
> patch lets readdir() and others skip over the whiteout directory entries
> they might find.
The NFSD maintainers and MLs should be CC'ed on such patches which touch
fs/nfsd/. I'd also suggst you change the subject line of this patch to:
whiteout/NFSD: don't return ...
This patch seems fairly straightforward: it returns 0 when d_type is DT_WHT.
As long as there's no way to create such whiteout entries (not until UM is
used), then there's no harm in pushing such patches upstream, no?
> Signed-off-by: Jan Blunck <j.blunck@...harburg.de>
> Signed-off-by: David Woodhouse <dwmw2@...radead.org>
> Signed-off-by: Valerie Aurora <vaurora@...hat.com>
> ---
> fs/compat.c | 9 +++++++++
> fs/nfsd/nfs3xdr.c | 5 +++++
> fs/nfsd/nfs4xdr.c | 2 +-
> fs/nfsd/nfsxdr.c | 4 ++++
> fs/readdir.c | 9 +++++++++
> 5 files changed, 28 insertions(+), 1 deletions(-)
>
> diff --git a/fs/compat.c b/fs/compat.c
> index 6d6f98f..43f6102 100644
> --- a/fs/compat.c
> +++ b/fs/compat.c
> @@ -847,6 +847,9 @@ 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;
> @@ -918,6 +921,9 @@ 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;
> @@ -1007,6 +1013,9 @@ 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 01d4ec1..59576d0 100644
> --- a/fs/nfsd/nfs3xdr.c
> +++ b/fs/nfsd/nfs3xdr.c
> @@ -884,6 +884,11 @@ 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 2dcc7fe..8c25012 100644
> --- a/fs/nfsd/nfs4xdr.c
> +++ b/fs/nfsd/nfs4xdr.c
> @@ -2263,7 +2263,7 @@ nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
> __be32 nfserr = nfserr_toosmall;
>
> /* In nfsv4, "." and ".." never make it onto the wire.. */
> - if (name && isdotent(name, namlen)) {
> + if (d_type == DT_WHT || (name && isdotent(name, namlen))) {
Optimization: I would swap the order of the two conditions separated by the
'||': the right-hand-side condition is far more likely to occur than
d_type==DT_WHT, so you can enter the body of the 'if' more quickly for the
common case.
> cd->common.err = nfs_ok;
> return 0;
> }
> diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
> index afd08e2..a7d622c 100644
> --- a/fs/nfsd/nfsxdr.c
> +++ b/fs/nfsd/nfsxdr.c
> @@ -513,6 +513,10 @@ 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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Erez.
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