From: Jeff Layton <jlayton@xxxxxxxxxx>
Necessary now for gfs2_fsync and sync_file_range, but there will
eventually be other callers.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
include/linux/fs.h | 11 ++++++++++-
mm/filemap.c | 23 +++++++++++++++++++++++
2 files changed, 33 insertions(+), 1 deletion(-)
v3: make file_write_and_wait a wrapper around file_write_and_wait_range
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 526b6a9f30d4..909210bd6366 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2549,6 +2549,8 @@ static inline int filemap_fdatawait(struct address_space *mapping)
extern bool filemap_range_has_page(struct address_space *, loff_t lstart,
loff_t lend);
+extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
+ loff_t lend);
extern int filemap_write_and_wait(struct address_space *mapping);
extern int filemap_write_and_wait_range(struct address_space *mapping,
loff_t lstart, loff_t lend);
@@ -2557,12 +2559,19 @@ extern int __filemap_fdatawrite_range(struct address_space *mapping,
extern int filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end);
extern int filemap_check_errors(struct address_space *mapping);
-
extern void __filemap_set_wb_err(struct address_space *mapping, int err);
+
+extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
+ loff_t lend);
extern int __must_check file_check_and_advance_wb_err(struct file *file);
extern int __must_check file_write_and_wait_range(struct file *file,
loff_t start, loff_t end);
+static inline int file_write_and_wait(struct file *file)
+{
+ return file_write_and_wait_range(file, 0, LLONG_MAX);
+}
+
/**
* filemap_set_wb_err - set a writeback error on an address_space
* @mapping: mapping in which to set writeback error
diff --git a/mm/filemap.c b/mm/filemap.c
index 953804b29a75..85dfe3bee324 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -476,6 +476,29 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
EXPORT_SYMBOL(filemap_fdatawait_range);
/**
+ * file_fdatawait_range - wait for writeback to complete
+ * @file: file pointing to 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 address space that file
+ * refers to, in the given range and wait for all of them. Check error
+ * status of the address space vs. the file->f_wb_err cursor and return it.
+ *
+ * Since the error status of the file is advanced by this function,
+ * callers are responsible for checking the return value and handling and/or
+ * reporting the error.
+ */
+int file_fdatawait_range(struct file *file, loff_t start_byte, loff_t end_byte)
+{
+ struct address_space *mapping = file->f_mapping;
+
+ __filemap_fdatawait_range(mapping, start_byte, end_byte);
+ return file_check_and_advance_wb_err(file);
+}
+EXPORT_SYMBOL(file_fdatawait_range);
+
+/**
* filemap_fdatawait_keep_errors - wait for writeback without clearing errors
* @mapping: address space structure to wait for
*
--
2.13.3
