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rbd: dynamically allocate object prefix 

There is no need to impose a small limit the length of the object
prefix recorded for an rbd image in a struct rbd_image_header.
Remove the limitation by allocating space for the object prefix
dynamically.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-07-09 21:04:24 -05:00 committed by Sage Weil
parent d22f76e703
commit 849b4260d4
1 changed files with 26 additions and 8 deletions
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34
drivers/block/rbd.c
View File

@ -77,7 +77,7 @@
*/ */
struct rbd_image_header { struct rbd_image_header {
u64 image_size; u64 image_size;
char object_prefix[32]; char *object_prefix;
__u8 obj_order; __u8 obj_order;
__u8 crypt_type; __u8 crypt_type;
__u8 comp_type; __u8 comp_type;
@ -517,8 +517,15 @@ static int rbd_header_from_disk(struct rbd_image_header *header,
header->snap_names = NULL; header->snap_names = NULL;
header->snap_sizes = NULL; header->snap_sizes = NULL;
} }
header->object_prefix = kmalloc(sizeof (ondisk->block_name) + 1,
gfp_flags);
if (!header->object_prefix)
goto err_sizes;
memcpy(header->object_prefix, ondisk->block_name, memcpy(header->object_prefix, ondisk->block_name,
sizeof(ondisk->block_name)); sizeof(ondisk->block_name));
header->object_prefix[sizeof (ondisk->block_name)] = '\0';
header->image_size = le64_to_cpu(ondisk->image_size); header->image_size = le64_to_cpu(ondisk->image_size);
header->obj_order = ondisk->options.order; header->obj_order = ondisk->options.order;
@ -545,6 +552,8 @@ static int rbd_header_from_disk(struct rbd_image_header *header,
return 0; return 0;
err_sizes:
kfree(header->snap_sizes);
err_names: err_names:
kfree(header->snap_names); kfree(header->snap_names);
err_snapc: err_snapc:
@ -610,9 +619,10 @@ done:
static void rbd_header_free(struct rbd_image_header *header) static void rbd_header_free(struct rbd_image_header *header)
{ {
kfree(header->snapc); kfree(header->object_prefix);
kfree(header->snap_names);
kfree(header->snap_sizes); kfree(header->snap_sizes);
kfree(header->snap_names);
kfree(header->snapc);
} }
/* /*
@ -1710,15 +1720,20 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev)
if head moves */ if head moves */
follow_seq = 1; follow_seq = 1;
kfree(rbd_dev->header.snapc); /* rbd_dev->header.object_prefix shouldn't change */
kfree(rbd_dev->header.snap_names);
kfree(rbd_dev->header.snap_sizes); kfree(rbd_dev->header.snap_sizes);
kfree(rbd_dev->header.snap_names);
kfree(rbd_dev->header.snapc);
rbd_dev->header.total_snaps = h.total_snaps; rbd_dev->header.total_snaps = h.total_snaps;
rbd_dev->header.snapc = h.snapc; rbd_dev->header.snapc = h.snapc;
rbd_dev->header.snap_names = h.snap_names; rbd_dev->header.snap_names = h.snap_names;
rbd_dev->header.snap_names_len = h.snap_names_len; rbd_dev->header.snap_names_len = h.snap_names_len;
rbd_dev->header.snap_sizes = h.snap_sizes; rbd_dev->header.snap_sizes = h.snap_sizes;
/* Free the extra copy of the object prefix */
WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix));
kfree(h.object_prefix);
if (follow_seq) if (follow_seq)
rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0]; rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0];
else else
@ -2361,10 +2376,11 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
if (!rbd_dev->pool_name) if (!rbd_dev->pool_name)
return -ENOMEM; return -ENOMEM;
ret = -EINVAL;
len = copy_token(&buf, rbd_dev->obj, sizeof (rbd_dev->obj)); len = copy_token(&buf, rbd_dev->obj, sizeof (rbd_dev->obj));
if (!len || len >= sizeof (rbd_dev->obj)) if (!len || len >= sizeof (rbd_dev->obj)) {
ret = -EINVAL;
goto out_err; goto out_err;
}
/* We have the object length in hand, save it. */ /* We have the object length in hand, save it. */
@ -2382,8 +2398,10 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
if (!len) if (!len)
memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME,
sizeof (RBD_SNAP_HEAD_NAME)); sizeof (RBD_SNAP_HEAD_NAME));
else if (len >= sizeof (rbd_dev->snap_name)) else if (len >= sizeof (rbd_dev->snap_name)) {
ret = -EINVAL;
goto out_err; goto out_err;
}
return 0; return 0;