On 03/27/2014 01:18 PM, Ilya Dryomov wrote:
> Use krealloc() instead of rolling our own. (krealloc() with a NULL
> first argument acts as a kmalloc()). Properly initalize the new array
> elements. This is needed to make future additions to osdmap easier.
Looks good.
Reviewed-by: Alex Elder <el...@linaro.org>
> Signed-off-by: Ilya Dryomov <ilya.dryo...@inktank.com>
> ---
> net/ceph/osdmap.c | 32 +++++++++++++++++---------------
> 1 file changed, 17 insertions(+), 15 deletions(-)
>
> diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
> index d6a569c5508f..4565c72fec5c 100644
> --- a/net/ceph/osdmap.c
> +++ b/net/ceph/osdmap.c
> @@ -646,38 +646,40 @@ void ceph_osdmap_destroy(struct ceph_osdmap *map)
> }
>
> /*
> - * adjust max osd value. reallocate arrays.
> + * Adjust max_osd value, (re)allocate arrays.
> + *
> + * The new elements are properly initialized.
> */
> static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
> {
> u8 *state;
> - struct ceph_entity_addr *addr;
> u32 *weight;
> + struct ceph_entity_addr *addr;
> + int i;
>
> - state = kcalloc(max, sizeof(*state), GFP_NOFS);
> - addr = kcalloc(max, sizeof(*addr), GFP_NOFS);
> - weight = kcalloc(max, sizeof(*weight), GFP_NOFS);
> - if (state == NULL || addr == NULL || weight == NULL) {
> + state = krealloc(map->osd_state, max*sizeof(*state), GFP_NOFS);
> + weight = krealloc(map->osd_weight, max*sizeof(*weight), GFP_NOFS);
> + addr = krealloc(map->osd_addr, max*sizeof(*addr), GFP_NOFS);
> + if (!state || !weight || !addr) {
> kfree(state);
> - kfree(addr);
> kfree(weight);
> + kfree(addr);
> +
> return -ENOMEM;
> }
>
> - /* copy old? */
> - if (map->osd_state) {
> - memcpy(state, map->osd_state, map->max_osd*sizeof(*state));
> - memcpy(addr, map->osd_addr, map->max_osd*sizeof(*addr));
> - memcpy(weight, map->osd_weight, map->max_osd*sizeof(*weight));
> - kfree(map->osd_state);
> - kfree(map->osd_addr);
> - kfree(map->osd_weight);
> + for (i = map->max_osd; i < max; i++) {
> + state[i] = 0;
> + weight[i] = CEPH_OSD_OUT;
> + memset(addr + i, 0, sizeof(*addr));
> }
>
> map->osd_state = state;
> map->osd_weight = weight;
> map->osd_addr = addr;
> +
> map->max_osd = max;
> +
> return 0;
> }
>
>
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