From 95099d4622f8cb224d94e314c7a8e0df60b13f87 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 09 Dec 2023 08:38:01 +0000
Subject: [PATCH] enable docker ppp
---
kernel/drivers/block/xen-blkback/blkback.c | 139 +++++++++++++++------------------------------
1 files changed, 47 insertions(+), 92 deletions(-)
diff --git a/kernel/drivers/block/xen-blkback/blkback.c b/kernel/drivers/block/xen-blkback/blkback.c
index d98cfd3..3874233 100644
--- a/kernel/drivers/block/xen-blkback/blkback.c
+++ b/kernel/drivers/block/xen-blkback/blkback.c
@@ -62,8 +62,8 @@
* IO workloads.
*/
-static int xen_blkif_max_buffer_pages = 1024;
-module_param_named(max_buffer_pages, xen_blkif_max_buffer_pages, int, 0644);
+static int max_buffer_pages = 1024;
+module_param_named(max_buffer_pages, max_buffer_pages, int, 0644);
MODULE_PARM_DESC(max_buffer_pages,
"Maximum number of free pages to keep in each block backend buffer");
@@ -78,8 +78,8 @@
* algorithm.
*/
-static int xen_blkif_max_pgrants = 1056;
-module_param_named(max_persistent_grants, xen_blkif_max_pgrants, int, 0644);
+static int max_pgrants = 1056;
+module_param_named(max_persistent_grants, max_pgrants, int, 0644);
MODULE_PARM_DESC(max_persistent_grants,
"Maximum number of grants to map persistently");
@@ -88,8 +88,8 @@
* use. The time is in seconds, 0 means indefinitely long.
*/
-static unsigned int xen_blkif_pgrant_timeout = 60;
-module_param_named(persistent_grant_unused_seconds, xen_blkif_pgrant_timeout,
+static unsigned int pgrant_timeout = 60;
+module_param_named(persistent_grant_unused_seconds, pgrant_timeout,
uint, 0644);
MODULE_PARM_DESC(persistent_grant_unused_seconds,
"Time in seconds an unused persistent grant is allowed to "
@@ -132,72 +132,10 @@
#define BLKBACK_INVALID_HANDLE (~0)
-/* Number of free pages to remove on each call to gnttab_free_pages */
-#define NUM_BATCH_FREE_PAGES 10
-
static inline bool persistent_gnt_timeout(struct persistent_gnt *persistent_gnt)
{
- return xen_blkif_pgrant_timeout &&
- (jiffies - persistent_gnt->last_used >=
- HZ * xen_blkif_pgrant_timeout);
-}
-
-static inline int get_free_page(struct xen_blkif_ring *ring, struct page **page)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&ring->free_pages_lock, flags);
- if (list_empty(&ring->free_pages)) {
- BUG_ON(ring->free_pages_num != 0);
- spin_unlock_irqrestore(&ring->free_pages_lock, flags);
- return gnttab_alloc_pages(1, page);
- }
- BUG_ON(ring->free_pages_num == 0);
- page[0] = list_first_entry(&ring->free_pages, struct page, lru);
- list_del(&page[0]->lru);
- ring->free_pages_num--;
- spin_unlock_irqrestore(&ring->free_pages_lock, flags);
-
- return 0;
-}
-
-static inline void put_free_pages(struct xen_blkif_ring *ring, struct page **page,
- int num)
-{
- unsigned long flags;
- int i;
-
- spin_lock_irqsave(&ring->free_pages_lock, flags);
- for (i = 0; i < num; i++)
- list_add(&page[i]->lru, &ring->free_pages);
- ring->free_pages_num += num;
- spin_unlock_irqrestore(&ring->free_pages_lock, flags);
-}
-
-static inline void shrink_free_pagepool(struct xen_blkif_ring *ring, int num)
-{
- /* Remove requested pages in batches of NUM_BATCH_FREE_PAGES */
- struct page *page[NUM_BATCH_FREE_PAGES];
- unsigned int num_pages = 0;
- unsigned long flags;
-
- spin_lock_irqsave(&ring->free_pages_lock, flags);
- while (ring->free_pages_num > num) {
- BUG_ON(list_empty(&ring->free_pages));
- page[num_pages] = list_first_entry(&ring->free_pages,
- struct page, lru);
- list_del(&page[num_pages]->lru);
- ring->free_pages_num--;
- if (++num_pages == NUM_BATCH_FREE_PAGES) {
- spin_unlock_irqrestore(&ring->free_pages_lock, flags);
- gnttab_free_pages(num_pages, page);
- spin_lock_irqsave(&ring->free_pages_lock, flags);
- num_pages = 0;
- }
- }
- spin_unlock_irqrestore(&ring->free_pages_lock, flags);
- if (num_pages != 0)
- gnttab_free_pages(num_pages, page);
+ return pgrant_timeout && (jiffies - persistent_gnt->last_used >=
+ HZ * pgrant_timeout);
}
#define vaddr(page) ((unsigned long)pfn_to_kaddr(page_to_pfn(page)))
@@ -234,7 +172,7 @@
struct persistent_gnt *this;
struct xen_blkif *blkif = ring->blkif;
- if (ring->persistent_gnt_c >= xen_blkif_max_pgrants) {
+ if (ring->persistent_gnt_c >= max_pgrants) {
if (!blkif->vbd.overflow_max_grants)
blkif->vbd.overflow_max_grants = 1;
return -EBUSY;
@@ -332,7 +270,8 @@
unmap_data.count = segs_to_unmap;
BUG_ON(gnttab_unmap_refs_sync(&unmap_data));
- put_free_pages(ring, pages, segs_to_unmap);
+ gnttab_page_cache_put(&ring->free_pages, pages,
+ segs_to_unmap);
segs_to_unmap = 0;
}
@@ -372,7 +311,8 @@
if (++segs_to_unmap == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
unmap_data.count = segs_to_unmap;
BUG_ON(gnttab_unmap_refs_sync(&unmap_data));
- put_free_pages(ring, pages, segs_to_unmap);
+ gnttab_page_cache_put(&ring->free_pages, pages,
+ segs_to_unmap);
segs_to_unmap = 0;
}
kfree(persistent_gnt);
@@ -380,7 +320,7 @@
if (segs_to_unmap > 0) {
unmap_data.count = segs_to_unmap;
BUG_ON(gnttab_unmap_refs_sync(&unmap_data));
- put_free_pages(ring, pages, segs_to_unmap);
+ gnttab_page_cache_put(&ring->free_pages, pages, segs_to_unmap);
}
}
@@ -397,14 +337,13 @@
goto out;
}
- if (ring->persistent_gnt_c < xen_blkif_max_pgrants ||
- (ring->persistent_gnt_c == xen_blkif_max_pgrants &&
+ if (ring->persistent_gnt_c < max_pgrants ||
+ (ring->persistent_gnt_c == max_pgrants &&
!ring->blkif->vbd.overflow_max_grants)) {
num_clean = 0;
} else {
- num_clean = (xen_blkif_max_pgrants / 100) * LRU_PERCENT_CLEAN;
- num_clean = ring->persistent_gnt_c - xen_blkif_max_pgrants +
- num_clean;
+ num_clean = (max_pgrants / 100) * LRU_PERCENT_CLEAN;
+ num_clean = ring->persistent_gnt_c - max_pgrants + num_clean;
num_clean = min(ring->persistent_gnt_c, num_clean);
pr_debug("Going to purge at least %u persistent grants\n",
num_clean);
@@ -599,8 +538,7 @@
current->comm, ring->st_oo_req,
ring->st_rd_req, ring->st_wr_req,
ring->st_f_req, ring->st_ds_req,
- ring->persistent_gnt_c,
- xen_blkif_max_pgrants);
+ ring->persistent_gnt_c, max_pgrants);
ring->st_print = jiffies + msecs_to_jiffies(10 * 1000);
ring->st_rd_req = 0;
ring->st_wr_req = 0;
@@ -665,8 +603,12 @@
ring->next_lru = jiffies + msecs_to_jiffies(LRU_INTERVAL);
}
- /* Shrink if we have more than xen_blkif_max_buffer_pages */
- shrink_free_pagepool(ring, xen_blkif_max_buffer_pages);
+ /* Shrink the free pages pool if it is too large. */
+ if (time_before(jiffies, blkif->buffer_squeeze_end))
+ gnttab_page_cache_shrink(&ring->free_pages, 0);
+ else
+ gnttab_page_cache_shrink(&ring->free_pages,
+ max_buffer_pages);
if (log_stats && time_after(jiffies, ring->st_print))
print_stats(ring);
@@ -697,7 +639,7 @@
ring->persistent_gnt_c = 0;
/* Since we are shutting down remove all pages from the buffer */
- shrink_free_pagepool(ring, 0 /* All */);
+ gnttab_page_cache_shrink(&ring->free_pages, 0 /* All */);
}
static unsigned int xen_blkbk_unmap_prepare(
@@ -736,7 +678,7 @@
but is this the best way to deal with this? */
BUG_ON(result);
- put_free_pages(ring, data->pages, data->count);
+ gnttab_page_cache_put(&ring->free_pages, data->pages, data->count);
make_response(ring, pending_req->id,
pending_req->operation, pending_req->status);
free_req(ring, pending_req);
@@ -803,7 +745,8 @@
if (invcount) {
ret = gnttab_unmap_refs(unmap, NULL, unmap_pages, invcount);
BUG_ON(ret);
- put_free_pages(ring, unmap_pages, invcount);
+ gnttab_page_cache_put(&ring->free_pages, unmap_pages,
+ invcount);
}
pages += batch;
num -= batch;
@@ -850,8 +793,11 @@
pages[i]->page = persistent_gnt->page;
pages[i]->persistent_gnt = persistent_gnt;
} else {
- if (get_free_page(ring, &pages[i]->page)) {
- put_free_pages(ring, pages_to_gnt, segs_to_map);
+ if (gnttab_page_cache_get(&ring->free_pages,
+ &pages[i]->page)) {
+ gnttab_page_cache_put(&ring->free_pages,
+ pages_to_gnt,
+ segs_to_map);
ret = -ENOMEM;
goto out;
}
@@ -884,7 +830,8 @@
BUG_ON(new_map_idx >= segs_to_map);
if (unlikely(map[new_map_idx].status != 0)) {
pr_debug("invalid buffer -- could not remap it\n");
- put_free_pages(ring, &pages[seg_idx]->page, 1);
+ gnttab_page_cache_put(&ring->free_pages,
+ &pages[seg_idx]->page, 1);
pages[seg_idx]->handle = BLKBACK_INVALID_HANDLE;
ret |= !ret;
goto next;
@@ -894,7 +841,7 @@
continue;
}
if (use_persistent_gnts &&
- ring->persistent_gnt_c < xen_blkif_max_pgrants) {
+ ring->persistent_gnt_c < max_pgrants) {
/*
* We are using persistent grants, the grant is
* not mapped but we might have room for it.
@@ -921,7 +868,7 @@
pages[seg_idx]->persistent_gnt = persistent_gnt;
pr_debug("grant %u added to the tree of persistent grants, using %u/%u\n",
persistent_gnt->gnt, ring->persistent_gnt_c,
- xen_blkif_max_pgrants);
+ max_pgrants);
goto next;
}
if (use_persistent_gnts && !blkif->vbd.overflow_max_grants) {
@@ -1274,7 +1221,7 @@
break;
case BLKIF_OP_WRITE_BARRIER:
drain = true;
- /* fall through */
+ fallthrough;
case BLKIF_OP_FLUSH_DISKCACHE:
ring->st_f_req++;
operation = REQ_OP_WRITE;
@@ -1520,5 +1467,13 @@
module_init(xen_blkif_init);
+static void __exit xen_blkif_fini(void)
+{
+ xen_blkif_xenbus_fini();
+ xen_blkif_interface_fini();
+}
+
+module_exit(xen_blkif_fini);
+
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("xen-backend:vbd");
--
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