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-rw-r--r--mm/filemap.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index d4ff48ec269e..c1b1708cc95d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -175,7 +175,7 @@ static int sync_page(void *word)
* dirty pages that lie within the byte offsets <start, end>
* @mapping: address space structure to write
* @start: offset in bytes where the range starts
- * @end: offset in bytes where the range ends
+ * @end: offset in bytes where the range ends (inclusive)
* @sync_mode: enable synchronous operation
*
* If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
@@ -368,6 +368,12 @@ int filemap_write_and_wait(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_write_and_wait);
+/*
+ * Write out and wait upon file offsets lstart->lend, inclusive.
+ *
+ * Note that `lend' is inclusive (describes the last byte to be written) so
+ * that this function can be used to write to the very end-of-file (end = -1).
+ */
int filemap_write_and_wait_range(struct address_space *mapping,
loff_t lstart, loff_t lend)
{