mm: add filemap_fdatawait_range_keep_errors()

In the spirit of filemap_fdatawait_range() and
filemap_fdatawait_keep_errors(), introduce
filemap_fdatawait_range_keep_errors() which both takes a range upon
which to wait and does not clear errors from the address space.

Signed-off-by: Ross Zwisler <zwisler@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: stable@vger.kernel.org

diff --git a/include/linux/fs.h b/include/linux/fs.h
index f7fdfe93e25d3e94cc4bc7b053ead12667607cc9..79fec8a8413f443c78ba2cdebc73d04c7db1b24f 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2712,6 +2712,8 @@ extern int filemap_flush(struct address_space *);
 extern int filemap_fdatawait_keep_errors(struct address_space *mapping);
 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
                                   loff_t lend);
+extern int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
+               loff_t start_byte, loff_t end_byte);
 
 static inline int filemap_fdatawait(struct address_space *mapping)
 {

diff --git a/mm/filemap.c b/mm/filemap.c
index df2006ba0cfa51813ed19dd2613705715f21d0b3..e87252ca0835acf18a4c3266bdfc2c6b6d49e03e 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -553,6 +553,28 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
 }
 EXPORT_SYMBOL(filemap_fdatawait_range);
 
+/**
+ * filemap_fdatawait_range_keep_errors - wait for writeback to complete
+ * @mapping:           address space structure to wait for
+ * @start_byte:                offset in bytes where the range starts
+ * @end_byte:          offset in bytes where the range ends (inclusive)
+ *
+ * Walk the list of under-writeback pages of the given address space in the
+ * given range and wait for all of them.  Unlike filemap_fdatawait_range(),
+ * this function does not clear error status of the address space.
+ *
+ * Use this function if callers don't handle errors themselves.  Expected
+ * call sites are system-wide / filesystem-wide data flushers: e.g. sync(2),
+ * fsfreeze(8)
+ */
+int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
+               loff_t start_byte, loff_t end_byte)
+{
+       __filemap_fdatawait_range(mapping, start_byte, end_byte);
+       return filemap_check_and_keep_errors(mapping);
+}
+EXPORT_SYMBOL(filemap_fdatawait_range_keep_errors);
+
 /**
  * file_fdatawait_range - wait for writeback to complete
  * @file:              file pointing to address space structure to wait for