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authorMiklos Szeredi <mszeredi@redhat.com>2020-07-14 14:45:41 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2020-07-14 14:45:41 +0200
commit6ddf3af93e32b996cfc30477ea1509960d4ba669 (patch)
tree8583e700803dfb749470fd99c0286674e6660bf0 /fs/fuse/file.c
parentb330966f79fb4fdc49183f58db113303695a750f (diff)
fuse: clean up condition for writepage sending
fuse_writepages_fill uses following construction: if (wpa && ap->num_pages && (A || B || C)) { action; } else if (wpa && D) { if (E) { the same action; } } - ap->num_pages check is always true and can be removed - "if" and "else if" calls the same action and can be merged. Move checking A, B, C, D, E conditions to a helper, add comments. Original-patch-by: Vasily Averin <vvs@virtuozzo.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/file.c')
-rw-r--r--fs/fuse/file.c53
1 files changed, 35 insertions, 18 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 63d52fed3381..a6a5aeff258d 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2015,6 +2015,40 @@ static bool fuse_writepage_add(struct fuse_writepage_args *new_wpa,
return false;
}
+static bool fuse_writepage_need_send(struct fuse_conn *fc, struct page *page,
+ struct fuse_args_pages *ap,
+ struct fuse_fill_wb_data *data)
+{
+ WARN_ON(!ap->num_pages);
+
+ /*
+ * Being under writeback is unlikely but possible. For example direct
+ * read to an mmaped fuse file will set the page dirty twice; once when
+ * the pages are faulted with get_user_pages(), and then after the read
+ * completed.
+ */
+ if (fuse_page_is_writeback(data->inode, page->index))
+ return true;
+
+ /* Reached max pages */
+ if (ap->num_pages == fc->max_pages)
+ return true;
+
+ /* Reached max write bytes */
+ if ((ap->num_pages + 1) * PAGE_SIZE > fc->max_write)
+ return true;
+
+ /* Discontinuity */
+ if (data->orig_pages[ap->num_pages - 1]->index + 1 != page->index)
+ return true;
+
+ /* Need to grow the pages array? If so, did the expansion fail? */
+ if (ap->num_pages == data->max_pages && !fuse_pages_realloc(data))
+ return true;
+
+ return false;
+}
+
static int fuse_writepages_fill(struct page *page,
struct writeback_control *wbc, void *_data)
{
@@ -2025,7 +2059,6 @@ static int fuse_writepages_fill(struct page *page,
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
struct page *tmp_page;
- bool is_writeback;
int err;
if (!data->ff) {
@@ -2035,25 +2068,9 @@ static int fuse_writepages_fill(struct page *page,
goto out_unlock;
}
- /*
- * Being under writeback is unlikely but possible. For example direct
- * read to an mmaped fuse file will set the page dirty twice; once when
- * the pages are faulted with get_user_pages(), and then after the read
- * completed.
- */
- is_writeback = fuse_page_is_writeback(inode, page->index);
-
- if (wpa && ap->num_pages &&
- (is_writeback || ap->num_pages == fc->max_pages ||
- (ap->num_pages + 1) * PAGE_SIZE > fc->max_write ||
- data->orig_pages[ap->num_pages - 1]->index + 1 != page->index)) {
+ if (wpa && fuse_writepage_need_send(fc, page, ap, data)) {
fuse_writepages_send(data);
data->wpa = NULL;
- } else if (wpa && ap->num_pages == data->max_pages) {
- if (!fuse_pages_realloc(data)) {
- fuse_writepages_send(data);
- data->wpa = NULL;
- }
}
err = -ENOMEM;