X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=mm%2Ffadvise.c;h=8d723c9e8b75b316041ea564f5e243b79a94e2b7;hb=e3237e3c60c1f4a790b4e521e406b3ffff74f9bc;hp=e43359214f6ff15020b6f05cc07aa5e6ddcb4162;hpb=db06816cb9ceb21a2bf24122407b7b4fe419c3fc;p=firefly-linux-kernel-4.4.55.git

diff --git a/mm/fadvise.c b/mm/fadvise.c
index e43359214f6f..8d723c9e8b75 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -77,12 +77,20 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
 	switch (advice) {
 	case POSIX_FADV_NORMAL:
 		file->f_ra.ra_pages = bdi->ra_pages;
+		spin_lock(&file->f_lock);
+		file->f_mode &= ~FMODE_RANDOM;
+		spin_unlock(&file->f_lock);
 		break;
 	case POSIX_FADV_RANDOM:
-		file->f_ra.ra_pages = 0;
+		spin_lock(&file->f_lock);
+		file->f_mode |= FMODE_RANDOM;
+		spin_unlock(&file->f_lock);
 		break;
 	case POSIX_FADV_SEQUENTIAL:
 		file->f_ra.ra_pages = bdi->ra_pages * 2;
+		spin_lock(&file->f_lock);
+		file->f_mode &= ~FMODE_RANDOM;
+		spin_unlock(&file->f_lock);
 		break;
 	case POSIX_FADV_WILLNEED:
 		if (!mapping->a_ops->readpage) {