From 5e7b78ceb3d7aa174e60c8b584955495f311378b Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Thu, 19 Jul 2012 17:12:59 -0500 Subject: [PATCH] rbd: rearrange rbd_header_from_disk() This just moves code around for the most part. It was pulled out as a separate patch to avoid cluttering up some upcoming patches which are more substantive. The point is basically to group everything related to initializing the snapshot context together. The only functional change is that rbd_header_from_disk() now ensures the (in-core) header it is passed is zero-filled. This allows a simpler error handling path in rbd_header_from_disk(). Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 41 ++++++++++++++++++++++------------------- 1 file changed, 22 insertions(+), 19 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 2a94f8e81f676..c9de0f8e808e3 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -506,11 +506,14 @@ static int rbd_header_from_disk(struct rbd_image_header *header, if (snap_count > size / sizeof (header->snapc->snaps[0])) return -EINVAL; - size = sizeof (struct ceph_snap_context); - size += snap_count * sizeof (header->snapc->snaps[0]); - header->snapc = kmalloc(size, GFP_KERNEL); - if (!header->snapc) + memset(header, 0, sizeof (*header)); + + size = sizeof (ondisk->block_name) + 1; + header->object_prefix = kmalloc(size, GFP_KERNEL); + if (!header->object_prefix) return -ENOMEM; + memcpy(header->object_prefix, ondisk->block_name, size - 1); + header->object_prefix[size - 1] = '\0'; if (snap_count) { header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); @@ -518,11 +521,12 @@ static int rbd_header_from_disk(struct rbd_image_header *header, header->snap_names = kmalloc(header->snap_names_len, GFP_KERNEL); if (!header->snap_names) - goto err_snapc; + goto out_err; + size = snap_count * sizeof (*header->snap_sizes); header->snap_sizes = kmalloc(size, GFP_KERNEL); if (!header->snap_sizes) - goto err_names; + goto out_err; } else { WARN_ON(ondisk->snap_names_len); header->snap_names_len = 0; @@ -530,22 +534,23 @@ static int rbd_header_from_disk(struct rbd_image_header *header, header->snap_sizes = NULL; } - size = sizeof (ondisk->block_name) + 1; - header->object_prefix = kmalloc(size, GFP_KERNEL); - if (!header->object_prefix) - goto err_sizes; - memcpy(header->object_prefix, ondisk->block_name, size - 1); - header->object_prefix[size - 1] = '\0'; - header->image_size = le64_to_cpu(ondisk->image_size); header->obj_order = ondisk->options.order; header->crypt_type = ondisk->options.crypt_type; header->comp_type = ondisk->options.comp_type; + header->total_snaps = snap_count; + + /* Set up the snapshot context */ + + size = sizeof (struct ceph_snap_context); + size += snap_count * sizeof (header->snapc->snaps[0]); + header->snapc = kzalloc(size, GFP_KERNEL); + if (!header->snapc) + goto out_err; atomic_set(&header->snapc->nref, 1); header->snapc->seq = le64_to_cpu(ondisk->snap_seq); header->snapc->num_snaps = snap_count; - header->total_snaps = snap_count; if (snap_count && allocated_snaps == snap_count) { int i; @@ -564,16 +569,14 @@ static int rbd_header_from_disk(struct rbd_image_header *header, return 0; -err_sizes: +out_err: kfree(header->snap_sizes); header->snap_sizes = NULL; -err_names: kfree(header->snap_names); header->snap_names = NULL; header->snap_names_len = 0; -err_snapc: - kfree(header->snapc); - header->snapc = NULL; + kfree(header->object_prefix); + header->object_prefix = NULL; return -ENOMEM; } -- 2.39.5