afs: Add stats for data transfer operations

Add statistics to /proc/fs/afs/stats for data transfer RPC operations.  New
lines are added that look like:

	file-rd : n=55794 nb=10252282150
	file-wr : n=9789 nb=3247763645

where n= indicates the number of ops completed and nb= indicates the number
of bytes successfully transferred.  file-rd is the counts for read/fetch
operations and file-wr the counts for write/store operations.

Note that directory and symlink downloading are included in the file-rd
stats at the moment.

Signed-off-by: David Howells <dhowells@redhat.com>

4 files changed, 23 insertions, 0 deletions

diff --git a/fs/afs/file.c b/fs/afs/file.c
index 91ff1335fd33..e5cac1bc3cf0 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -242,6 +242,12 @@ int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *de
                 ret = afs_end_vnode_operation(&fc);
         }
 
+        if (ret == 0) {
+                afs_stat_v(vnode, n_fetches);
+                atomic_long_add(desc->actual_len,
+                                &afs_v2net(vnode)->n_fetch_bytes);
+        }
+
         _leave(" = %d", ret);
         return ret;
 }
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 6ae023cbf00e..f6b44f47732d 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -273,6 +273,10 @@ struct afs_net {
         atomic_t                n_read_dir;     /* Number of directory pages read */
         atomic_t                n_dir_cr;       /* Number of directory entry creation edits */
         atomic_t                n_dir_rm;       /* Number of directory entry removal edits */
+        atomic_t                n_stores;       /* Number of store ops */
+        atomic_long_t           n_store_bytes;  /* Number of bytes stored */
+        atomic_long_t           n_fetch_bytes;  /* Number of bytes fetched */
+        atomic_t                n_fetches;      /* Number of data fetch ops */
 };
 
 extern const char afs_init_sysname[];
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index 3212bce0d4fb..839a22280606 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -922,6 +922,13 @@ static int afs_proc_stats_show(struct seq_file *m, void *v)
         seq_printf(m, "dir-edit: cr=%u rm=%u\n",
                    atomic_read(&net->n_dir_cr),
                    atomic_read(&net->n_dir_rm));
+
+        seq_printf(m, "file-rd : n=%u nb=%lu\n",
+                   atomic_read(&net->n_fetches),
+                   atomic_long_read(&net->n_fetch_bytes));
+        seq_printf(m, "file-wr : n=%u nb=%lu\n",
+                   atomic_read(&net->n_stores),
+                   atomic_long_read(&net->n_store_bytes));
         return 0;
 }
 
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 70a563c14e6f..eccc16198f68 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -356,6 +356,12 @@ found_key:
         }
 
         switch (ret) {
+        case 0:
+                afs_stat_v(vnode, n_stores);
+                atomic_long_add((last * PAGE_SIZE + to) -
+                                (first * PAGE_SIZE + offset),
+                                &afs_v2net(vnode)->n_store_bytes);
+                break;
         case -EACCES:
         case -EPERM:
         case -ENOKEY: