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shm: verify the system supports FALLOC_FL_PUNCH_HOLE

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Daniel Eklöf 2020-03-22 20:36:15 +01:00
parent 3b9be09b06
commit 7404ace40c
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GPG key ID: 5BBD4992C116573F
1 changed files with 12 additions and 0 deletions
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12
shm.c
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@ -25,6 +25,9 @@
static tll(struct buffer) buffers;
static bool can_punch_hole = false;
static bool can_punch_hole_initialized = false;
static void
buffer_destroy(struct buffer *buf)
{
@ -226,6 +229,12 @@ shm_get_buffer(struct wl_shm *shm, int width, int height, unsigned long cookie)
goto err;
}
if (!can_punch_hole_initialized) {
can_punch_hole_initialized = true;
can_punch_hole = fallocate(
pool_fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 1) == 0;
}
/* Push to list of available buffers, but marked as 'busy' */
tll_push_back(
buffers,
@ -274,6 +283,9 @@ shm_scroll(struct wl_shm *shm, struct buffer *buf, int rows)
assert(buf->real_mmapped);
assert(buf->fd >= 0);
if (!can_punch_hole)
return false;
LOG_DBG("scrolling %d rows (%d bytes)", rows, rows * buf->stride);
assert(rows > 0);