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writeback: add wbc_to_write_flags()

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Add wbc_to_write_flags(), which returns the write modifier flags to use,
based on a struct writeback_control. No functional changes in this
patch, but it prepares us for factoring other wbc fields for write type.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jens Axboe 2016-11-01 10:00:38 -06:00
parent 1d796d6a96
commit 7637241e65
8 changed files with 17 additions and 16 deletions
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9
include/linux/writeback.h
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@ -9,6 +9,7 @@
#include <linux/fs.h>
#include <linux/flex_proportions.h>
#include <linux/backing-dev-defs.h>
#include <linux/blk_types.h>
struct bio;
@ -102,6 +103,14 @@ struct writeback_control {
#endif
};
static inline int wbc_to_write_flags(struct writeback_control *wbc)
{
if (wbc->sync_mode == WB_SYNC_ALL)
return REQ_SYNC;
return 0;
}
/*
* A wb_domain represents a domain that wb's (bdi_writeback's) belong to
* and are measured against each other in. There always is one global