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shm: Disallow shrinking shm pools

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Unused shm space will be automatically reclaimed if unused or can be
explicitly returned by using fallocate FALLOC_FL_PUNCH_HOLE.

https://bugs.freedesktop.org/show_bug.cgi?id=74632
This commit is contained in:
Kristian Høgsberg 2014-04-07 14:42:20 -07:00
parent c1aa1291a1
commit 24cdbe3d69
2 changed files with 10 additions and 3 deletions
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10
src/wayland-shm.c
View file

@ -50,7 +50,7 @@ struct wl_shm_pool {
struct wl_resource *resource;
int refcount;
char *data;
int size;
int32_t size;
};
struct wl_shm_buffer {
@ -195,8 +195,14 @@ shm_pool_resize(struct wl_client *client, struct wl_resource *resource,
struct wl_shm_pool *pool = wl_resource_get_user_data(resource);
void *data;
data = mremap(pool->data, pool->size, size, MREMAP_MAYMOVE);
if (size < pool->size) {
wl_resource_post_error(resource,
WL_SHM_ERROR_INVALID_FD,
"shrinking pool invalid");
return;
}
data = mremap(pool->data, pool->size, size, MREMAP_MAYMOVE);
if (data == MAP_FAILED) {
wl_resource_post_error(resource,
WL_SHM_ERROR_INVALID_FD,