add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/mm/fadvise.c
..
..
@@ -22,13 +22,14 @@
22
22
 
23
23
 #include <asm/unistd.h>
24
24
 
25
+#include "internal.h"
26
+
25
27
 /*
26
28
  * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
27
29
  * deactivate the pages and clear PG_Referenced.
28
30
  */
29
31
 
30
-static int generic_fadvise(struct file *file, loff_t offset, loff_t len,
31
-			   int advice)
32
+int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
32
33
 {
33
34
 	struct inode *inode;
34
35
 	struct address_space *mapping;
..
..
@@ -103,10 +104,6 @@
103
104
 		if (!nrpages)
104
105
 			nrpages = ~0UL;
105
106
 
106
-		/*
107
-		 * Ignore return value because fadvise() shall return
108
-		 * success even if filesystem can't retrieve a hint,
109
-		 */
110
107
 		force_page_cache_readahead(mapping, file, start_index, nrpages);
111
108
 		break;
112
109
 	case POSIX_FADV_NOREUSE:
..
..
@@ -144,7 +141,7 @@
144
141
 		}
145
142
 
146
143
 		if (end_index >= start_index) {
147
-			unsigned long count;
144
+			unsigned long nr_pagevec = 0;
148
145
 
149
146
 			/*
150
147
 			 * It's common to FADV_DONTNEED right after
..
..
@@ -157,8 +154,9 @@
157
154
 			 */
158
155
 			lru_add_drain();
159
156
 
160
-			count = invalidate_mapping_pages(mapping,
161
-						start_index, end_index);
157
+			invalidate_mapping_pagevec(mapping,
158
+						start_index, end_index,
159
+						&nr_pagevec);
162
160
 
163
161
 			/*
164
162
 			 * If fewer pages were invalidated than expected then
..
..
@@ -166,7 +164,7 @@
166
164
 			 * a per-cpu pagevec for a remote CPU. Drain all
167
165
 			 * pagevecs and try again.
168
166
 			 */
169
-			if (count < (end_index - start_index + 1)) {
167
+			if (nr_pagevec) {
170
168
 				lru_add_drain_all();
171
169
 				invalidate_mapping_pages(mapping, start_index,
172
170
 						end_index);
..
..
@@ -178,6 +176,7 @@
178
176
 	}
179
177
 	return 0;
180
178
 }
179
+EXPORT_SYMBOL(generic_fadvise);
181
180
 
182
181
 int vfs_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
183
182
 {