exofs: Add offset/length to exofs_get_io_state

In future raid code we will need to know the IO offset/length
and if it's a read or write to determine some of the array
sizes we'll need.

So add a new exofs_get_rw_state() API for use when
writeing/reading. All other simple cases are left using the
old way.

The major change to this is that now we need to call
exofs_get_io_state later at inode.c::read_exec and
inode.c::write_exec when we actually know these things. So this
patch is kept separate so I can test things apart from other
changes.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/fs/exofs/ios.c b/fs/exofs/ios.c
index fbb47ba2cd71..096405e51b94 100644
--- a/fs/exofs/ios.c
+++ b/fs/exofs/ios.c
@@ -69,8 +69,8 @@ out:
         return ret;
 }
 
-int exofs_get_io_state(struct exofs_layout *layout,
-                       struct exofs_io_state **pios)
+int  exofs_get_rw_state(struct exofs_layout *layout, bool is_reading,
+                        u64 offset, u64 length, struct exofs_io_state **pios)
 {
         struct exofs_io_state *ios;
 
@@ -87,10 +87,20 @@ int exofs_get_io_state(struct exofs_layout *layout,
 
         ios->layout = layout;
         ios->obj.partition = layout->s_pid;
+        ios->offset = offset;
+        ios->length = length;
+        ios->reading = is_reading;
+
         *pios = ios;
         return 0;
 }
 
+int  exofs_get_io_state(struct exofs_layout *layout,
+                        struct exofs_io_state **ios)
+{
+        return exofs_get_rw_state(layout, true, 0, 0, ios);
+}
+
 void exofs_put_io_state(struct exofs_io_state *ios)
 {
         if (ios) {