net/9p: Convert net/9p protocol dumps to tracepoints

This helps in more control over debugging.
root@qemu-img-64:~# ls /pass/123
ls: cannot access /pass/123: No such file or directory
root@qemu-img-64:~# cat /sys/kernel/debug/tracing/trace
# tracer: nop
#
#           TASK-PID    CPU#    TIMESTAMP  FUNCTION
#              | |       |          |         |
              ls-1536  [001]    70.928584: 9p_protocol_dump: clnt 18446612132784021504 P9_TWALK(tag = 1)
000: 16 00 00 00 6e 01 00 01 00 00 00 02 00 00 00 01
010: 00 03 00 31 32 33 00 00 00 ff ff ff ff 00 00 00

              ls-1536  [001]    70.928587: <stack trace>
 => trace_9p_protocol_dump
 => p9pdu_finalize
 => p9_client_rpc
 => p9_client_walk
 => v9fs_vfs_lookup
 => d_alloc_and_lookup
 => walk_component
 => path_lookupat
              ls-1536  [000]    70.929696: 9p_protocol_dump: clnt 18446612132784021504 P9_RLERROR(tag = 1)
000: 0b 00 00 00 07 01 00 02 00 00 00 4e 03 00 02 00
010: 00 00 00 00 03 00 02 00 00 00 00 00 ff 43 00 00

              ls-1536  [000]    70.929697: <stack trace>
 => trace_9p_protocol_dump
 => p9_client_rpc
 => p9_client_walk
 => v9fs_vfs_lookup
 => d_alloc_and_lookup
 => walk_component
 => path_lookupat
 => do_path_lookup

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

1 files changed, 5 insertions, 7 deletions

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index ce6600f33659..598fff1a54e5 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -165,9 +165,8 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
                 }
                 while (rdir->head < rdir->tail) {
                         p9stat_init(&st);
-                        err = p9stat_read(rdir->buf + rdir->head,
-                                                rdir->tail - rdir->head, &st,
-                                                fid->clnt->proto_version);
+                        err = p9stat_read(fid->clnt, rdir->buf + rdir->head,
+                                          rdir->tail - rdir->head, &st);
                         if (err) {
                                 P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
                                 err = -EIO;
@@ -241,10 +240,9 @@ static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
 
                 while (rdir->head < rdir->tail) {
 
-                        err = p9dirent_read(rdir->buf + rdir->head,
-                                                rdir->tail - rdir->head,
-                                                &curdirent,
-                                                fid->clnt->proto_version);
+                        err = p9dirent_read(fid->clnt, rdir->buf + rdir->head,
+                                            rdir->tail - rdir->head,
+                                            &curdirent);
                         if (err < 0) {
                                 P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
                                 err = -EIO;