From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/mm/fadvise.c | 19 +++++++++----------
1 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/kernel/mm/fadvise.c b/kernel/mm/fadvise.c
index 467bcd0..d6baa4f 100644
--- a/kernel/mm/fadvise.c
+++ b/kernel/mm/fadvise.c
@@ -22,13 +22,14 @@
#include <asm/unistd.h>
+#include "internal.h"
+
/*
* POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
* deactivate the pages and clear PG_Referenced.
*/
-static int generic_fadvise(struct file *file, loff_t offset, loff_t len,
- int advice)
+int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
{
struct inode *inode;
struct address_space *mapping;
@@ -103,10 +104,6 @@
if (!nrpages)
nrpages = ~0UL;
- /*
- * Ignore return value because fadvise() shall return
- * success even if filesystem can't retrieve a hint,
- */
force_page_cache_readahead(mapping, file, start_index, nrpages);
break;
case POSIX_FADV_NOREUSE:
@@ -144,7 +141,7 @@
}
if (end_index >= start_index) {
- unsigned long count;
+ unsigned long nr_pagevec = 0;
/*
* It's common to FADV_DONTNEED right after
@@ -157,8 +154,9 @@
*/
lru_add_drain();
- count = invalidate_mapping_pages(mapping,
- start_index, end_index);
+ invalidate_mapping_pagevec(mapping,
+ start_index, end_index,
+ &nr_pagevec);
/*
* If fewer pages were invalidated than expected then
@@ -166,7 +164,7 @@
* a per-cpu pagevec for a remote CPU. Drain all
* pagevecs and try again.
*/
- if (count < (end_index - start_index + 1)) {
+ if (nr_pagevec) {
lru_add_drain_all();
invalidate_mapping_pages(mapping, start_index,
end_index);
@@ -178,6 +176,7 @@
}
return 0;
}
+EXPORT_SYMBOL(generic_fadvise);
int vfs_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
{
--
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