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authorJohn Hubbard <jhubbard@nvidia.com>2020-05-23 06:59:09 +0300
committerMike Marshall <hubcap@omnibond.com>2020-05-29 23:25:04 +0300
commit0df556457748d160013e88202c11712c16a83b0c (patch)
tree2436d8f32cf4d541a30ae62e4fd96d0fc354dc19
parent22ce85611fd5a793edf84bfc0a101077cbe85e4f (diff)
downloadlinux-0df556457748d160013e88202c11712c16a83b0c.tar.xz
orangefs: convert get_user_pages() --> pin_user_pages()
This code was using get_user_pages*(), in a "Case 1" scenario (Direct IO), using the categorization from [1]. That means that it's time to convert the get_user_pages*() + put_page() calls to pin_user_pages*() + unpin_user_pages() calls. There is some helpful background in [2]: basically, this is a small part of fixing a long-standing disconnect between pinning pages, and file systems' use of those pages. [1] Documentation/core-api/pin_user_pages.rst [2] "Explicit pinning of user-space pages": https://lwn.net/Articles/807108/ Cc: Mike Marshall <hubcap@omnibond.com> Cc: Martin Brandenburg <martin@omnibond.com> Cc: devel@lists.orangefs.org Cc: linux-fsdevel@vger.kernel.org Signed-off-by: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Mike Marshall <hubcap@omnibond.com>
-rw-r--r--fs/orangefs/orangefs-bufmap.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/orangefs/orangefs-bufmap.c b/fs/orangefs/orangefs-bufmap.c
index 2bb916d68576..538e839590ef 100644
--- a/fs/orangefs/orangefs-bufmap.c
+++ b/fs/orangefs/orangefs-bufmap.c
@@ -168,10 +168,7 @@ static DEFINE_SPINLOCK(orangefs_bufmap_lock);
static void
orangefs_bufmap_unmap(struct orangefs_bufmap *bufmap)
{
- int i;
-
- for (i = 0; i < bufmap->page_count; i++)
- put_page(bufmap->page_array[i]);
+ unpin_user_pages(bufmap->page_array, bufmap->page_count);
}
static void
@@ -268,7 +265,7 @@ orangefs_bufmap_map(struct orangefs_bufmap *bufmap,
int offset = 0, ret, i;
/* map the pages */
- ret = get_user_pages_fast((unsigned long)user_desc->ptr,
+ ret = pin_user_pages_fast((unsigned long)user_desc->ptr,
bufmap->page_count, FOLL_WRITE, bufmap->page_array);
if (ret < 0)
@@ -280,7 +277,7 @@ orangefs_bufmap_map(struct orangefs_bufmap *bufmap,
for (i = 0; i < ret; i++) {
SetPageError(bufmap->page_array[i]);
- put_page(bufmap->page_array[i]);
+ unpin_user_page(bufmap->page_array[i]);
}
return -ENOMEM;
}