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iomap: add private pointer to struct iomap

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Add a private pointer to struct iomap to allow filesystems to pass data
from iomap_begin to iomap_end.  Will be used by gfs2 for passing on the
on-disk inode buffer head.

Signed-off-by: Andreas Gruenbacher <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
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Andreas Gruenbacher authored and Darrick J. Wong committed 2018-06-19 15:10:57 -07:00
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commit e184fde6f3
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include/linux/iomap.h
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@@ -57,6 +57,7 @@ struct iomap {
struct block_device *bdev; /* block device for I/O */
struct dax_device *dax_dev; /* dax_dev for dax operations */
void *inline_data;
void *private; /* filesystem private */
/*
* Called when finished processing a page in the mapping returned in