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u3: refactors snapshot patch application

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This commit is contained in:
Joe Bryan 2020-08-04 13:56:33 -07:00
parent 08d22b14d3
commit 99d2056749
1 changed files with 29 additions and 26 deletions
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55
pkg/urbit/noun/events.c
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@ -609,44 +609,47 @@ _ce_image_sync(u3e_image* img_u)
c3_sync(img_u->fid_i);
}
/* _ce_patch_apply(): apply patch to image.
/* _ce_image_resize(): resize image, truncating if it shrunk.
*/
static void
_ce_image_resize(u3e_image* img_u, c3_w pgs_w)
{
if ( img_u->pgs_w > pgs_w ) {
if ( ftruncate(img_u->fid_i, pgs_w << (u3a_page + 2)) ) {
fprintf(stderr, "loom: image truncate %s: %s\r\n",
img_u->nam_c,
strerror(errno));
c3_assert(0);
}
}
img_u->pgs_w = pgs_w;
}
/* _ce_patch_apply(): apply patch to images.
*/
static void
_ce_patch_apply(u3_ce_patch* pat_u)
{
c3_w i_w;
//u3l_log("image: nor_w %d, new %d\r\n", u3P.nor_u.pgs_w, pat_u->con_u->nor_w);
//u3l_log("image: sou_w %d, new %d\r\n", u3P.sou_u.pgs_w, pat_u->con_u->sou_w);
// resize images
//
_ce_image_resize(&u3P.nor_u, pat_u->con_u->nor_w);
_ce_image_resize(&u3P.sou_u, pat_u->con_u->sou_w);
if ( u3P.nor_u.pgs_w > pat_u->con_u->nor_w ) {
c3_w ret_w;
ret_w = ftruncate(u3P.nor_u.fid_i, pat_u->con_u->nor_w << (u3a_page + 2));
if (ret_w){
fprintf(stderr, "loom: patch apply truncate north: %s\r\n", strerror(errno));
c3_assert(0);
}
}
u3P.nor_u.pgs_w = pat_u->con_u->nor_w;
if ( u3P.sou_u.pgs_w > pat_u->con_u->sou_w ) {
c3_w ret_w;
ret_w = ftruncate(u3P.sou_u.fid_i, pat_u->con_u->sou_w << (u3a_page + 2));
if (ret_w){
fprintf(stderr, "loom: patch apply truncate south: %s\r\n", strerror(errno));
c3_assert(0);
}
}
u3P.sou_u.pgs_w = pat_u->con_u->sou_w;
if ( (-1 == lseek(pat_u->mem_i, 0, SEEK_SET)) ||
(-1 == lseek(u3P.nor_u.fid_i, 0, SEEK_SET)) ||
(-1 == lseek(u3P.sou_u.fid_i, 0, SEEK_SET)) )
// seek to begining of patch and images
//
if ( (-1 == lseek(pat_u->mem_i, 0, SEEK_SET))
|| (-1 == lseek(u3P.nor_u.fid_i, 0, SEEK_SET))
|| (-1 == lseek(u3P.sou_u.fid_i, 0, SEEK_SET)) )
{
fprintf(stderr, "loom: patch apply seek 0: %s\r\n", strerror(errno));
c3_assert(0);
}
// write patch pages into the appropriate image
//
for ( i_w = 0; i_w < pat_u->con_u->pgs_w; i_w++ ) {
c3_w pag_w = pat_u->con_u->mem_u[i_w].pag_w;
c3_w mem_w[1 << u3a_page];