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From: Frank van der Linden <fllinden@amazon.com>
To: <linux-nfs@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>
Subject: [RFC PATCH 32/35] xattr: add a function to check if a namespace is supported
Date: Mon, 2 Sep 2019 20:34:23 +0000
Message-ID: <64c6cfb84541b4231ea1b29100f6641d8a7e169a.1568309119.git.fllinden@amazon.com> (raw)
In-Reply-To: <cover.1568309119.git.fllinden@amazon.com>

Add a function that checks is an extended attribute namespace is
supported for an inode.

To be used by the nfs server code when being queried for extended
attributes support.

Signed-off-by: Frank van der Linden <fllinden@amazon.com>
---
 fs/xattr.c            | 27 +++++++++++++++++++++++++++
 include/linux/xattr.h |  2 ++
 2 files changed, 29 insertions(+)

diff --git a/fs/xattr.c b/fs/xattr.c
index 58013bcbc333..7d0ebab1df30 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -134,6 +134,33 @@ xattr_permission(struct inode *inode, const char *name, int mask)
 	return inode_permission(inode, mask);
 }
 
+/*
+ * Look for any handler that deals with the specified namespace.
+ */
+int
+xattr_supported_namespace(struct inode *inode, const char *prefix)
+{
+	const struct xattr_handler **handlers = inode->i_sb->s_xattr;
+	const struct xattr_handler *handler;
+	size_t preflen;
+
+	if (!(inode->i_opflags & IOP_XATTR)) {
+		if (unlikely(is_bad_inode(inode)))
+			return -EIO;
+		return -EOPNOTSUPP;
+	}
+
+	preflen = strlen(prefix);
+
+	for_each_xattr_handler(handlers, handler) {
+		if (!strncmp(xattr_prefix(handler), prefix, preflen))
+			return 0;
+	}
+
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(xattr_supported_namespace);
+
 int
 __vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
 	       const void *value, size_t size, int flags)
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 3a71ad716da5..32e377602068 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -61,6 +61,8 @@ ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_siz
 ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
 			   char **xattr_value, size_t size, gfp_t flags);
 
+int xattr_supported_namespace(struct inode *inode, const char *prefix);
+
 static inline const char *xattr_prefix(const struct xattr_handler *handler)
 {
 	return handler->prefix ?: handler->name;
-- 
2.17.2


  parent reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-12 17:25 [RFC PATCH 00/35] user xattr support (RFC8276) Frank van der Linden
2019-07-01 17:56 ` [RFC PATCH 02/35] nfs/nfsd: basic NFS4 extended attribute definitions Frank van der Linden
2019-08-26 21:38 ` [RFC PATCH 03/35] NFSv4.2: query the server for extended attribute support Frank van der Linden
2019-08-26 21:53 ` [RFC PATCH 04/35] nfs: parse the {no}user_xattr option Frank van der Linden
2019-08-26 22:06 ` [RFC PATCH 05/35] NFSv4.2: define a function to compute the maximum XDR size for listxattr Frank van der Linden
2019-08-26 22:23 ` [RFC PATCH 06/35] NFSv4.2: define and set initial limits for extended attributes Frank van der Linden
2019-08-26 22:32 ` [RFC PATCH 07/35] NFSv4.2: define argument and response structures for xattr operations Frank van der Linden
2019-08-26 22:44 ` [RFC PATCH 08/35] NFSv4.2: define the encode/decode sizes for the XATTR operations Frank van der Linden
2019-08-26 23:09 ` [RFC PATCH 09/35] NFSv4.2: define and use extended attribute overhead sizes Frank van der Linden
2019-08-27 15:34 ` [RFC PATCH 10/35] NFSv4.2: add client side XDR handling for extended attributes Frank van der Linden
2019-08-27 15:46 ` [RFC PATCH 11/35] nfs: define nfs_access_get_cached function Frank van der Linden
2019-08-27 16:01 ` [RFC PATCH 12/35] NFSv4.2: query the extended attribute access bits Frank van der Linden
2019-08-27 22:51 ` [RFC PATCH 13/35] nfs: modify update_changeattr to deal with regular files Frank van der Linden
2019-08-30 22:48 ` [RFC PATCH 14/35] nfs: define and use the NFS_INO_INVALID_XATTR flag Frank van der Linden
2019-08-30 22:56 ` [RFC PATCH 15/35] nfs: make the buf_to_pages_noslab function available to the nfs code Frank van der Linden
2019-08-30 23:15 ` [RFC PATCH 16/35] NFSv4.2: add the extended attribute proc functions Frank van der Linden
2019-08-30 23:31 ` [RFC PATCH 17/35] NFSv4.2: hook in the user extended attribute handlers Frank van der Linden
2019-08-30 23:38 ` [RFC PATCH 18/35] NFSv4.2: add client side xattr caching functions Frank van der Linden
2019-08-30 23:45 ` [RFC PATCH 19/35] NFSv4.2: call the xattr cache functions Frank van der Linden
2019-08-30 23:59 ` [RFC PATCH 20/35] nfs: add the NFS_V4_XATTR config option Frank van der Linden
2019-08-31  2:12 ` [RFC PATCH 21/35] xattr: modify vfs_{set,remove}xattr for NFS server use Frank van der Linden
2019-08-31 19:00 ` [RFC PATCH 22/35] nfsd: split off the write decode code in to a seperate function Frank van der Linden
2019-08-31 19:19 ` [RFC PATCH 23/35] nfsd: add defines for NFSv4.2 extended attribute support Frank van der Linden
2019-08-31 21:35 ` [RFC PATCH 26/35] nfsd: add structure definitions for xattr requests / responses Frank van der Linden
2019-08-31 23:53 ` [RFC PATCH 24/35] nfsd: define xattr functions to call in to their vfs counterparts Frank van der Linden
2019-09-01  0:13 ` [RFC PATCH 25/35] nfsd: take xattr access bits in to account when checking Frank van der Linden
2019-09-01  1:19 ` [RFC PATCH 27/35] nfsd: implement the xattr procedure functions Frank van der Linden
2019-09-01  2:46 ` [RFC PATCH 01/35] nfsd: make sure the nfsd4_ops array has the right size Frank van der Linden
2019-09-02 19:40 ` [RFC PATCH 28/35] nfsd: define xattr reply size functions Frank van der Linden
2019-09-02 19:58 ` [RFC PATCH 29/35] nfsd: add xattr XDR decode functions Frank van der Linden
2019-09-02 20:09 ` [RFC PATCH 30/35] nfsd: add xattr XDR encode functions Frank van der Linden
2019-09-02 20:19 ` [RFC PATCH 31/35] nfsd: add xattr operations to ops array Frank van der Linden
2019-09-02 20:34 ` Frank van der Linden [this message]
2019-09-02 21:30 ` [RFC PATCH 33/35] nfsd: add fattr support for user extended attributes Frank van der Linden
2019-09-02 23:06 ` [RFC PATCH 34/35] nfsd: add export flag to disable " Frank van der Linden
2019-09-02 23:17 ` [RFC PATCH 35/35] nfsd: add NFSD_V4_XATTR config option Frank van der Linden
2019-10-24 20:16 ` [RFC PATCH 00/35] user xattr support (RFC8276) Chuck Lever
2019-10-24 23:15   ` Frank van der Linden
2019-10-25 19:55     ` Chuck Lever
2019-11-04  3:01       ` bfields
2019-11-04 15:36         ` Chuck Lever
2019-11-04 16:21           ` Frank van der Linden
2019-11-04 22:58             ` Bruce Fields
2019-11-05  0:06               ` Frank van der Linden
2019-11-05 15:44               ` Chuck Lever

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