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o Targets now get rw passed through so they can do COW for example

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o Added error handler (not sure that this is the "correct" way to do
   this at the moment, so its a bit exprimental for now)
This commit is contained in:
Steven Whitehouse 2001-09-14 16:22:02 +00:00
parent 875fa752a0
commit de37c802d7
4 changed files with 19 additions and 8 deletions
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4
driver/device-mapper/device-mapper.h
View File

@ -46,7 +46,8 @@ typedef int (*dm_ctr_fn)(struct dm_table *t,
dm_error_fn fn, void *private);
typedef void (*dm_dtr_fn)(struct dm_table *t, void *c);
typedef int (*dm_map_fn)(struct buffer_head *bh, void *context);
typedef int (*dm_map_fn)(struct buffer_head *bh, int rw, void *context);
typedef int (*dm_err_fn)(struct buffer_head *bh, int rw, void *context);
/*
* information about a target type
@ -59,6 +60,7 @@ struct target_type {
dm_ctr_fn ctr;
dm_dtr_fn dtr;
dm_map_fn map;
dm_err_fn err;
unsigned long flags;
};

2
driver/device-mapper/dm-linear.c
View File

@ -103,7 +103,7 @@ static void linear_dtr(struct dm_table *t, void *c)
kfree(c);
}
static int linear_map(struct buffer_head *bh, void *context)
static int linear_map(struct buffer_head *bh, int rw, void *context)
{
struct linear_c *lc = (struct linear_c *) context;

2
driver/device-mapper/dm-target.c
View File

@ -134,7 +134,7 @@ static void io_err_dtr(struct dm_table *t, void *c)
/* empty */
}
static int io_err_map(struct buffer_head *bh, void *context)
static int io_err_map(struct buffer_head *bh, int rw, void *context)
{
buffer_IO_error(bh);
return 0;

19
driver/device-mapper/dm.c
View File

@ -48,6 +48,8 @@ int _version[3] = { 0, 1, 0 };
struct io_hook {
struct mapped_device *md;
struct target *target;
int rw;
void (*end_io) (struct buffer_head * bh, int uptodate);
void *context;
};
@ -297,6 +299,11 @@ static void dec_pending(struct buffer_head *bh, int uptodate)
{
struct io_hook *ih = bh->b_private;
if (!uptodate && ih->target->type->err) {
if (ih->target->type->err(bh, ih->rw, ih->target->private))
return;
}
if (atomic_dec_and_test(&ih->md->pending))
/* nudge anyone waiting on suspend queue */
wake_up(&ih->md->wait);
@ -337,11 +344,11 @@ static int queue_io(struct mapped_device *md, struct buffer_head *bh, int rw)
* do the bh mapping for a given leaf
*/
static inline int __map_buffer(struct mapped_device *md,
struct buffer_head *bh, int leaf)
struct buffer_head *bh, int rw, int leaf)
{
dm_map_fn fn;
void *context;
struct io_hook *ih = 0;
struct io_hook *ih = NULL;
int r;
struct target *ti = md->map->targets + leaf;
@ -357,10 +364,12 @@ static inline int __map_buffer(struct mapped_device *md,
return 0;
ih->md = md;
ih->rw = rw;
ih->target = ti;
ih->end_io = bh->b_end_io;
ih->context = bh->b_private;
r = fn(bh, context);
r = fn(bh, rw, context);
if (r > 0) {
/* hook the end io request fn */
@ -430,7 +439,7 @@ static int dm_user_bmap(struct inode *inode, struct lv_bmap *lvb)
struct target *t = md->map->targets + __find_node(md->map, &bh);
struct target_type *target = t->type;
if (target->flags & TF_BMAP) {
err = target->map(&bh, t->private);
err = target->map(&bh, READ, t->private);
}
}
up_read(&_dev_lock);
@ -473,7 +482,7 @@ static int request(request_queue_t *q, int rw, struct buffer_head *bh)
down_read(&_dev_lock); /* FIXME: there's still a race here */
}
if (!__map_buffer(md, bh, __find_node(md->map, bh)))
if (!__map_buffer(md, bh, rw, __find_node(md->map, bh)))
goto bad;
up_read(&_dev_lock);