9p: readdir implementation for 9p2000.L

This patch implements the kernel part of readdir() implementation for 9p2000.L

    Change from V3: Instead of inode, server now sends qids for each dirent

    SYNOPSIS

    size[4] Treaddir tag[2] fid[4] offset[8] count[4]
    size[4] Rreaddir tag[2] count[4] data[count]

    DESCRIPTION

    The readdir request asks the server to read the directory specified by 'fid'
    at an offset specified by 'offset' and return as many dirent structures as
    possible that fit into count bytes. Each dirent structure is laid out as
    follows.

            qid.type[1]
              the type of the file (directory, etc.), represented as a bit
              vector corresponding to the high 8 bits of the file's mode
              word.

            qid.vers[4]
              version number for given path

            qid.path[8]
              the file server's unique identification for the file

            offset[8]
              offset into the next dirent.

            type[1]
              type of this directory entry.

            name[256]
              name of this directory entry.

    This patch adds v9fs_dir_readdir_dotl() as the readdir() call for 9p2000.L.
    This function sends P9_TREADDIR command to the server. In response the server
    sends a buffer filled with dirent structures. This is different from the
    existing v9fs_dir_readdir() call which receives stat structures from the server.
    This results in significant speedup of readdir() on large directories.
    For example, doing 'ls >/dev/null' on a directory with 10000 files on my
    laptop takes 1.088 seconds with the existing code, but only takes 0.339 seconds
    with the new readdir.

Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 156c26bb8bd7..f1b0b310265d 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -133,6 +133,8 @@ enum p9_msg_t {
         P9_RSTATFS,
         P9_TRENAME = 20,
         P9_RRENAME,
+        P9_TREADDIR = 40,
+        P9_RREADDIR,
         P9_TVERSION = 100,
         P9_RVERSION,
         P9_TAUTH = 102,
@@ -275,6 +277,9 @@ enum p9_qid_t {
 /* ample room for Twrite/Rread header */
 #define P9_IOHDRSZ      24
 
+/* Room for readdir header */
+#define P9_READDIRHDRSZ 24
+
 /**
  * struct p9_str - length prefixed string type
  * @len: length of the string
@@ -485,6 +490,18 @@ struct p9_rwrite {
         u32 count;
 };
 
+struct p9_treaddir {
+        u32 fid;
+        u64 offset;
+        u32 count;
+};
+
+struct p9_rreaddir {
+        u32 count;
+        u8 *data;
+};
+
+
 struct p9_tclunk {
         u32 fid;
 };