Commit 98339edf authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: enable discarding of folios backing an xfile 



Create a new xfile function to discard the page cache that's backing
part of an xfile.  The next patch wil use this to drop parts of an xfile
that aren't needed anymore.

Signed-off-by: default avatarDarrick J. Wong <djwong@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent fe6c9f8e

fs/xfs/scrub/trace.h

+1 −0
Original line number Diff line number Diff line
@@ -948,6 +948,7 @@ DEFINE_XFILE_EVENT(xfile_store); 
DEFINE_XFILE_EVENT(xfile_seek_data);

DEFINE_XFILE_EVENT(xfile_get_folio);

DEFINE_XFILE_EVENT(xfile_put_folio);

DEFINE_XFILE_EVENT(xfile_discard);



TRACE_EVENT(xfarray_create,

	TP_PROTO(struct xfarray *xfa, unsigned long long required_capacity),

fs/xfs/scrub/xfile.c

+12 −0
Original line number Diff line number Diff line
@@ -310,3 +310,15 @@ xfile_put_folio( 
	folio_unlock(folio);

	folio_put(folio);

}



/* Discard the page cache that's backing a range of the xfile. */

void

xfile_discard(

	struct xfile		*xf,

	loff_t			pos,

	u64			count)

{

	trace_xfile_discard(xf, pos, count);



	shmem_truncate_range(file_inode(xf->file), pos, pos + count - 1);

}

fs/xfs/scrub/xfile.h

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ int xfile_load(struct xfile *xf, void *buf, size_t count, loff_t pos); 
int xfile_store(struct xfile *xf, const void *buf, size_t count,

		loff_t pos);



void xfile_discard(struct xfile *xf, loff_t pos, u64 count);

loff_t xfile_seek_data(struct xfile *xf, loff_t pos);



#define XFILE_MAX_FOLIO_SIZE	(PAGE_SIZE << MAX_PAGECACHE_ORDER)