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exofs: Add offset/length to exofs_get_io_state

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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>
This commit is contained in:
Boaz Harrosh
2010-11-16 20:09:58 +02:00
parent 16f75bb35d
commit e1042ba099
3 changed files with 38 additions and 16 deletions
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6
fs/exofs/exofs.h
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@ -109,7 +109,7 @@ static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
}
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 @@ struct exofs_io_state {
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 @@ void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
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);