kclient: simplify no-xattr encoding a bit

diff --git a/src/kernel/inode.c b/src/kernel/inode.c
index ef3cd939f6001937b5bbe9fa4db9fa4d4b0411cd..4eb69976a3f783c92cedcc18a972033f2ad884fe 100644 (file)
--- a/src/kernel/inode.c
+++ b/src/kernel/inode.c
@@ -1872,6 +1872,10 @@ ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
 
        spin_lock(&inode->i_lock);
 
+       err = -ENODATA;
+       if (!ci->i_xattr_len)
+               goto out;
+
        /* find attr */
        p = ci->i_xattr_data;
        end = p + ci->i_xattr_len;
@@ -1902,7 +1906,7 @@ out:
        return err;
 
 bad:
-       derr(10, "currupt xattr info on %p %llx\n", dentry->d_inode,
+       derr(10, "corrupt xattr info on %p %llx\n", dentry->d_inode,
             ceph_ino(dentry->d_inode));
        err = -EIO;
        goto out;
@@ -1913,7 +1917,7 @@ ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
        struct inode *inode = dentry->d_inode;
        struct ceph_inode_info *ci = ceph_inode(inode);
        int namelen = 0;
-       u32 numattr;
+       u32 numattr = 0;
        void *p, *end;
        int err;
 
@@ -1924,17 +1928,20 @@ ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
        spin_lock(&inode->i_lock);
 
        /* measure len */
-       p = ci->i_xattr_data;
-       end = p + ci->i_xattr_len;
-       ceph_decode_32_safe(&p, end, numattr, bad);
-       while (numattr--) {
-               u32 len;
-               ceph_decode_32_safe(&p, end, len, bad);
-               namelen += len + 1;
-               p += len;
-               ceph_decode_32_safe(&p, end, len, bad);
-               p += len;
-       }
+       if (ci->i_xattr_len) {
+               p = ci->i_xattr_data;
+               end = p + ci->i_xattr_len;
+               ceph_decode_32_safe(&p, end, numattr, bad);
+               while (numattr--) {
+                       u32 len;
+                       ceph_decode_32_safe(&p, end, len, bad);
+                       namelen += len + 1;
+                       p += len;
+                       ceph_decode_32_safe(&p, end, len, bad);
+                       p += len;
+               }
+       } else
+               namelen = 1; /* for \0 */
 
        err = -ERANGE;
        if (size && namelen > size)
@@ -1944,25 +1951,28 @@ ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
                goto out;
 
        /* copy names */
-       p = ci->i_xattr_data;
-       ceph_decode_32(&p, numattr);
-       while (numattr--) {
-               u32 len;
-               ceph_decode_32(&p, len);
-               memcpy(names, p, len);
-               names[len] = '\0';
-               names += len + 1;
-               p += len;
-               ceph_decode_32(&p, len);
-               p += len;       
-       }
+       if (ci->i_xattr_len) {
+               p = ci->i_xattr_data;
+               ceph_decode_32(&p, numattr);
+               while (numattr--) {
+                       u32 len;
+                       ceph_decode_32(&p, len);
+                       memcpy(names, p, len);
+                       names[len] = '\0';
+                       names += len + 1;
+                       p += len;
+                       ceph_decode_32(&p, len);
+                       p += len;       
+               }
+       } else
+               names[0] = 0;
 
 out:
        spin_unlock(&inode->i_lock);
        return err;
 
 bad:
-       derr(10, "currupt xattr info on %p %llx\n", dentry->d_inode,
+       derr(10, "corrupt xattr info on %p %llx\n", dentry->d_inode,
             ceph_ino(dentry->d_inode));
        err = -EIO;
        goto out;

diff --git a/src/messages/MClientReply.h b/src/messages/MClientReply.h
index 52606d32821d8d4c2068e9074f206be544cf6564..7604a219ec4412b78b196dda253eee27d258f0ff 100644 (file)
--- a/src/messages/MClientReply.h
+++ b/src/messages/MClientReply.h
@@ -158,8 +158,10 @@ struct InodeStat {
 
     bufferlist xbl;
     ::decode(xbl, p);
-    bufferlist::iterator q = xbl.begin();
-    ::decode(xattrs, q);
+    if (xbl.length()) {
+      bufferlist::iterator q = xbl.begin();
+      ::decode(xattrs, q);
+    }
   }
 
   static void encode(bufferlist &bl, CInode *in) {
@@ -201,7 +203,8 @@ struct InodeStat {
     ::encode(in->symlink, bl);
 
     bufferlist xbl;
-    ::encode(in->xattrs, xbl);
+    if (!in->xattrs.empty())
+      ::encode(in->xattrs, xbl);
     ::encode(xbl, bl);
   }