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iomap: add a page_done callback

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This will be used by gfs2 to attach data to transactions for the journaled
data mode.  But the concept is generic enough that we might be able to
use it for other purposes like encryption/integrity post-processing in the
future.

Based on a patch from Andreas Gruenbacher.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-06-19 15:10:56 -07:00 committed by Darrick J. Wong
parent 19e0c58f65
commit 63899c6f88
2 changed files with 12 additions and 0 deletions
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3
fs/iomap.c
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@ -201,6 +201,9 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
copied, page, NULL);
}
if (iomap->page_done)
iomap->page_done(inode, pos, copied, page, iomap);
if (ret < len)
iomap_write_failed(inode, pos, len);
return ret;

9
include/linux/iomap.h
View File

@ -9,6 +9,7 @@ struct fiemap_extent_info;
struct inode;
struct iov_iter;
struct kiocb;
struct page;
struct vm_area_struct;
struct vm_fault;
@ -56,6 +57,14 @@ struct iomap {
struct block_device *bdev; /* block device for I/O */
struct dax_device *dax_dev; /* dax_dev for dax operations */
void *inline_data;
/*
* Called when finished processing a page in the mapping returned in
* this iomap. At least for now this is only supported in the buffered
* write path.
*/
void (*page_done)(struct inode *inode, loff_t pos, unsigned copied,
struct page *page, struct iomap *iomap);
};
/*