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>
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 9f62349..fd913dd 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -109,7 +109,7 @@
}
struct exofs_io_state;
-typedef void (*exofs_io_done_fn)(struct exofs_io_state *or, void *private);
+typedef void (*exofs_io_done_fn)(struct exofs_io_state *ios, void *private);
struct exofs_io_state {
struct kref kref;
@@ -137,6 +137,8 @@
unsigned out_attr_len;
struct osd_attr *out_attr;
+ bool reading;
+
/* Variable array of size numdevs */
unsigned numdevs;
struct exofs_per_dev_state {
@@ -218,6 +220,8 @@
int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
u64 offset, void *p, unsigned length);
+int exofs_get_rw_state(struct exofs_layout *layout, bool is_reading,
+ u64 offset, u64 length, struct exofs_io_state **ios);
int exofs_get_io_state(struct exofs_layout *layout,
struct exofs_io_state **ios);
void exofs_put_io_state(struct exofs_io_state *ios);