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rbd: update capacity in rbd_dev_refresh()

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When a mapped image changes size, we change the capacity recorded
for the Linux disk associated with it, in rbd_update_mapping_size().
That function is called in two places--the format 1 and format 2
refresh routines.

There is no need to set the capacity while holding the header
semaphore.  Instead, do it in the common rbd_dev_refresh(), using
the logic that's already there to initiate disk revalidation.

Add handling in the request function, just in case a request
that exceeds the capacity of the device comes in (perhaps one
that was started before a refresh shrunk the device).

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-05-06 07:40:30 -05:00
parent e627db085e
commit 00a653e216
1 changed files with 15 additions and 8 deletions
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23
drivers/block/rbd.c
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@ -2874,6 +2874,13 @@ static void rbd_request_fn(struct request_queue *q)
goto end_request; /* Shouldn't happen */
}
result = -EIO;
if (offset + length > rbd_dev->mapping.size) {
rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)\n",
offset, length, rbd_dev->mapping.size);
goto end_request;
}
result = -ENOMEM;
img_request = rbd_img_request_create(rbd_dev, offset, length,
write_request, false);
@ -3116,14 +3123,8 @@ static void rbd_update_mapping_size(struct rbd_device *rbd_dev)
if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
return;
if (rbd_dev->mapping.size != rbd_dev->header.image_size) {
sector_t size;
if (rbd_dev->mapping.size != rbd_dev->header.image_size)
rbd_dev->mapping.size = rbd_dev->header.image_size;
size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
dout("setting size to %llu sectors", (unsigned long long)size);
set_capacity(rbd_dev->disk, size);
}
}
/*
@ -3200,8 +3201,14 @@ static int rbd_dev_refresh(struct rbd_device *rbd_dev)
rbd_exists_validate(rbd_dev);
mutex_unlock(&ctl_mutex);
if (mapping_size != rbd_dev->mapping.size)
if (mapping_size != rbd_dev->mapping.size) {
sector_t size;
size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
dout("setting size to %llu sectors", (unsigned long long)size);
set_capacity(rbd_dev->disk, size);
revalidate_disk(rbd_dev->disk);
}
return ret;
}