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-rw-r--r--mm/page-writeback.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 2970e35fd03f..eb277bdd4c5d 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -868,9 +868,10 @@ int write_cache_pages(struct address_space *mapping,
int done = 0;
struct pagevec pvec;
int nr_pages;
+ pgoff_t uninitialized_var(writeback_index);
pgoff_t index;
pgoff_t end; /* Inclusive */
- int scanned = 0;
+ int cycled;
int range_whole = 0;
long nr_to_write = wbc->nr_to_write;
@@ -881,14 +882,19 @@ int write_cache_pages(struct address_space *mapping,
pagevec_init(&pvec, 0);
if (wbc->range_cyclic) {
- index = mapping->writeback_index; /* Start from prev offset */
+ writeback_index = mapping->writeback_index; /* prev offset */
+ index = writeback_index;
+ if (index == 0)
+ cycled = 1;
+ else
+ cycled = 0;
end = -1;
} else {
index = wbc->range_start >> PAGE_CACHE_SHIFT;
end = wbc->range_end >> PAGE_CACHE_SHIFT;
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
range_whole = 1;
- scanned = 1;
+ cycled = 1; /* ignore range_cyclic tests */
}
retry:
while (!done && (index <= end) &&
@@ -897,7 +903,6 @@ retry:
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
unsigned i;
- scanned = 1;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
@@ -915,7 +920,11 @@ retry:
continue;
}
- if (!wbc->range_cyclic && page->index > end) {
+ if (page->index > end) {
+ /*
+ * can't be range_cyclic (1st pass) because
+ * end == -1 in that case.
+ */
done = 1;
unlock_page(page);
continue;
@@ -946,13 +955,15 @@ retry:
pagevec_release(&pvec);
cond_resched();
}
- if (!scanned && !done) {
+ if (!cycled) {
/*
+ * range_cyclic:
* We hit the last page and there is more work to be done: wrap
* back to the start of the file
*/
- scanned = 1;
+ cycled = 1;
index = 0;
+ end = writeback_index - 1;
goto retry;
}
if (!wbc->no_nrwrite_index_update) {