From: Frank van der Linden <fllinden@amazon.com>
To: <bfields@fieldses.org>, <chuck.lever@oracle.com>,
<linux-nfs@vger.kernel.org>
Cc: Frank van der Linden <fllinden@amazon.com>
Subject: [PATCH 13/14] xattr: add a function to check if a namespace is supported
Date: Wed, 11 Mar 2020 19:59:53 +0000 [thread overview]
Message-ID: <20200311195954.27117-14-fllinden@amazon.com> (raw)
In-Reply-To: <20200311195954.27117-1-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;
--
2.16.6
next prev parent reply other threads:[~2020-03-11 20:00 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 19:59 [PATCH 00/14] server side user xattr support (RFC 8276) Frank van der Linden
2020-03-11 19:59 ` [PATCH 01/14] nfs,nfsd: NFSv4.2 extended attribute protocol definitions Frank van der Linden
2020-03-11 19:59 ` [PATCH 02/14] xattr: modify vfs_{set,remove}xattr for NFS server use Frank van der Linden
2020-03-12 16:23 ` Chuck Lever
2020-03-13 15:35 ` J. Bruce Fields
2020-03-13 16:07 ` [PATCH 02/14] xattr: modify vfs_{set, remove}xattr " Frank van der Linden
2020-03-13 21:06 ` J. Bruce Fields
2020-03-11 19:59 ` [PATCH 03/14] nfsd: split off the write decode code in to a separate function Frank van der Linden
2020-03-11 19:59 ` [PATCH 04/14] nfsd: make sure the nfsd4_ops array has the right size Frank van der Linden
2020-03-11 19:59 ` [PATCH 05/14] nfsd: add defines for NFSv4.2 extended attribute support Frank van der Linden
2020-03-12 16:23 ` Chuck Lever
2020-03-11 19:59 ` [PATCH 06/14] nfsd: define xattr functions to call in to their vfs counterparts Frank van der Linden
2020-03-12 7:37 ` kbuild test robot
2020-03-12 16:23 ` Chuck Lever
2020-03-12 17:16 ` Frank van der Linden
2020-03-12 17:57 ` Chuck Lever
2020-03-11 19:59 ` [PATCH 07/14] nfsd: take xattr bits in to account for permission checks Frank van der Linden
2020-03-11 19:59 ` [PATCH 08/14] nfsd: add structure definitions for xattr requests / responses Frank van der Linden
2020-03-11 19:59 ` [PATCH 09/14] nfsd: use kvmalloc in svcxdr_tmpalloc Frank van der Linden
2020-03-11 19:59 ` [PATCH 10/14] nfsd: implement the xattr procedure functions Frank van der Linden
2020-03-12 10:28 ` kbuild test robot
2020-03-12 16:24 ` Chuck Lever
2020-03-11 19:59 ` [PATCH 11/14] nfsd: add user xattr RPC XDR encoding/decoding logic Frank van der Linden
2020-03-12 13:28 ` kbuild test robot
2020-03-12 16:24 ` Chuck Lever
2020-03-19 22:13 ` Frank van der Linden
2020-03-19 22:15 ` Chuck Lever
2020-03-25 23:44 ` Frank van der Linden
2020-03-26 14:12 ` Chuck Lever
2020-03-12 19:16 ` Chuck Lever
2020-03-20 16:47 ` Frank van der Linden
2020-03-20 17:34 ` Chuck Lever
2020-03-20 17:54 ` J. Bruce Fields
2020-03-20 19:44 ` Frank van der Linden
2020-03-11 19:59 ` [PATCH 12/14] nfsd: add xattr operations to ops array Frank van der Linden
2020-03-11 19:59 ` Frank van der Linden [this message]
2020-03-12 16:24 ` [PATCH 13/14] xattr: add a function to check if a namespace is supported Chuck Lever
2020-03-11 19:59 ` [PATCH 14/14] nfsd: add fattr support for user extended attributes Frank van der Linden
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