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Subject[PATCH 01/17] vfs: Introduce filemap_fdatawait_range
Date
This simple helper saves some filesystems conversion from byte offset
to page numbers and also makes the fdata* interface more complete.

Signed-off-by: Jan Kara <jack@suse.cz>
---
include/linux/fs.h | 2 ++
mm/filemap.c | 20 ++++++++++++++++++++
2 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 67888a9..cb365ad 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2076,6 +2076,8 @@ extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
extern int filemap_fdatawait(struct address_space *);
+extern int filemap_fdatawait_range(struct address_space *, 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);
diff --git a/mm/filemap.c b/mm/filemap.c
index ccea3b6..65b2e50 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -307,6 +307,26 @@ int wait_on_page_writeback_range(struct address_space *mapping,
}

/**
+ * filemap_fdatawait_range - wait for all under-writeback pages to complete in a given range
+ * @mapping: address space structure to wait for
+ * @start: offset in bytes where the range starts
+ * @end: 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.
+ *
+ * This is just a simple wrapper so that callers don't have to convert offsets
+ * to page indexes themselves
+ */
+int filemap_fdatawait_range(struct address_space *mapping, loff_t start,
+ loff_t end)
+{
+ return wait_on_page_writeback_range(mapping, start >> PAGE_CACHE_SHIFT,
+ end >> PAGE_CACHE_SHIFT);
+}
+EXPORT_SYMBOL(filemap_fdatawait_range);
+
+/**
* sync_page_range - write and wait on all pages in the passed range
* @inode: target inode
* @mapping: target address_space
--
1.6.0.2


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