linux-kernel - [PATCH 08/32] whiteout: Don't return information about whiteouts to userspace

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Date:	Mon, 18 May 2009 18:09:04 +0200
From:	Jan Blunck <jblunck@...e.de>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	viro@...iv.linux.org.uk, bharata@...ibm.com, dwmw2@...radead.org,
	mszeredi@...e.cz, vaurora@...hat.com
Subject: [PATCH 08/32] whiteout: Don't return information about whiteouts to userspace

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.

Signed-off-by: Jan Blunck <j.blunck@...harburg.de>
Signed-off-by: David Woodhouse <dwmw2@...radead.org>
Signed-off-by: Valerie Aurora (Henson) <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 d0145ca..9b83e4b 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -828,6 +828,9 @@ 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;
@@ -899,6 +902,9 @@ 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;
@@ -988,6 +994,9 @@ 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 17d0dd9..06c67af 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -883,6 +883,11 @@ 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 9250067..b001ed5 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1908,7 +1908,7 @@ 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))) {
 		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;
-- 
1.6.1.3

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