9p: Implement client side of setattr for 9P2000.L protocol.

    SYNOPSIS

      size[4] Tsetattr tag[2] attr[n]

      size[4] Rsetattr tag[2]

    DESCRIPTION

      The setattr command changes some of the file status information.
      attr resembles the iattr structure used in Linux kernel. It
      specifies which status parameter is to be changed and to what
      value. It is laid out as follows:

         valid[4]
            specifies which status information is to be changed. Possible
            values are:
            ATTR_MODE       (1 << 0)
            ATTR_UID        (1 << 1)
            ATTR_GID        (1 << 2)
            ATTR_SIZE       (1 << 3)
            ATTR_ATIME      (1 << 4)
            ATTR_MTIME      (1 << 5)
            ATTR_ATIME_SET  (1 << 7)
            ATTR_MTIME_SET  (1 << 8)

            The last two bits represent whether the time information
            is being sent by the client's user space. In the absense
            of these bits the server always uses server's time.

         mode[4]
            File permission bits

         uid[4]
            Owner id of file

         gid[4]
            Group id of the file

         size[8]
            File size

         atime_sec[8]
            Time of last file access, seconds

         atime_nsec[8]
            Time of last file access, nanoseconds

         mtime_sec[8]
            Time of last file modification, seconds

         mtime_nsec[8]
            Time of last file modification, nanoseconds

Explanation of the patches:
--------------------------

*) The kernel just copies relevent contents of iattr structure to
   p9_iattr_dotl structure and passes it down to the client. The
   only check it has is calling inode_change_ok()
*) The p9_iattr_dotl structure does not have ctime and ia_file
   parameters because I don't think these are needed in our case.
   The client user space can request updating just ctime by calling
   chown(fd, -1, -1). This is handled on server side without a need
   for putting ctime on the wire.
*) The server currently supports changing mode, time, ownership and
   size of the file.
*) 9P RFC says "Either all the changes in wstat request happen, or
   none of them does: if the request succeeds, all changes were made;
   if it fails, none were."
   I have not done anything to implement this specifically because I
   don't see a reason.

Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

2 files changed, 29 insertions, 0 deletions

diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index ab12e1c9cc7e..7f64d72f6c61 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -135,6 +135,8 @@ enum p9_msg_t {
         P9_RRENAME,
         P9_TGETATTR = 24,
         P9_RGETATTR,
+        P9_TSETATTR = 26,
+        P9_RSETATTR,
         P9_TREADDIR = 40,
         P9_RREADDIR,
         P9_TVERSION = 100,
@@ -406,6 +408,32 @@ struct p9_stat_dotl {
 #define P9_STATS_BASIC          0x000007ffULL /* Mask for fields up to BLOCKS */
 #define P9_STATS_ALL            0x00003fffULL /* Mask for All fields above */
 
+/**
+ * struct p9_iattr_dotl - P9 inode attribute for setattr
+ * @valid: bitfield specifying which fields are valid
+ *         same as in struct iattr
+ * @mode: File permission bits
+ * @uid: user id of owner
+ * @gid: group id
+ * @size: File size
+ * @atime_sec: Last access time, seconds
+ * @atime_nsec: Last access time, nanoseconds
+ * @mtime_sec: Last modification time, seconds
+ * @mtime_nsec: Last modification time, nanoseconds
+ */
+
+struct p9_iattr_dotl {
+        u32 valid;
+        u32 mode;
+        u32 uid;
+        u32 gid;
+        u64 size;
+        u64 atime_sec;
+        u64 atime_nsec;
+        u64 mtime_sec;
+        u64 mtime_nsec;
+};
+
 /* Structures for Protocol Operations */
 struct p9_tstatfs {
         u32 fid;
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 6462eec435bc..afdc385152f6 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -237,6 +237,7 @@ int p9dirent_read(char *buf, int len, struct p9_dirent *dirent,
                                                         int proto_version);
 struct p9_wstat *p9_client_stat(struct p9_fid *fid);
 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
+int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr);
 
 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
                                                         u64 request_mask);