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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2010-05-31 13:22:50 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2010-08-02 14:28:34 -0500
commiteda25e46161527845572131b37706a458d9270ef (patch)
treeb8a68c9185f7f53a135422a41dc68ef2c5f527ee
parent0ef63f345c48afe5896c5cffcba57f0457d409b9 (diff)
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net/9p: Implement TXATTRCREATE 9p call
TXATTRCREATE: Prepare a fid for setting xattr value on a file system object. size[4] TXATTRCREATE tag[2] fid[4] name[s] attr_size[8] flags[4] size[4] RXATTRCREATE tag[2] txattrcreate gets a fid pointing to xattr. This fid can later be used to set the xattr value. flag value is derived from set Linux setxattr. The manpage says "The flags parameter can be used to refine the semantics of the operation. XATTR_CREATE specifies a pure create, which fails if the named attribute exists already. XATTR_REPLACE specifies a pure replace operation, which fails if the named attribute does not already exist. By default (no flags), the extended attribute will be created if need be, or will simply replace the value if the attribute exists." The actual setxattr operation happens when the fid is clunked. At that point the written byte count and the attr_size specified in TXATTRCREATE should be same otherwise an error will be returned. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--include/net/9p/9p.h2
-rw-r--r--include/net/9p/client.h1
-rw-r--r--net/9p/client.c25
3 files changed, 28 insertions, 0 deletions
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 6fabb5e559ba..a8de812ccbc8 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -155,6 +155,8 @@ enum p9_msg_t {
P9_RSETATTR,
P9_TXATTRWALK = 30,
P9_RXATTRWALK,
+ P9_TXATTRCREATE = 32,
+ P9_RXATTRCREATE,
P9_TREADDIR = 40,
P9_RREADDIR,
P9_TLINK = 70,
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 60398b1a3f75..d1aa2cfb30f0 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -261,5 +261,6 @@ void p9stat_free(struct p9_wstat *);
int p9_is_proto_dotu(struct p9_client *clnt);
int p9_is_proto_dotl(struct p9_client *clnt);
struct p9_fid *p9_client_xattrwalk(struct p9_fid *, const char *, u64 *);
+int p9_client_xattrcreate(struct p9_fid *, const char *, u64, int);
#endif /* NET_9P_CLIENT_H */
diff --git a/net/9p/client.c b/net/9p/client.c
index ec80ee71d453..43396acd714a 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1672,6 +1672,31 @@ error:
}
EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
+int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
+ u64 attr_size, int flags)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ P9_DPRINTK(P9_DEBUG_9P,
+ ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
+ fid->fid, name, (long long)attr_size, flags);
+ err = 0;
+ clnt = fid->clnt;
+ req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
+ fid->fid, name, attr_size, flags);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+ P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
+
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
{
int err, rsize, total;