Unverified Commit 14656154 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Konstantin Komarov
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ntfs: Do not kmap pages used for reading from disk 



These pages are accessed through DMA and vmap; they are not accessed
by calling page_address(), so they do not need to be kmapped.

Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarKonstantin Komarov <almaz.alexandrovich@paragon-software.com>
parent 801f614b

fs/ntfs3/frecord.c

+0 −4
Original line number Diff line number Diff line
@@ -2590,7 +2590,6 @@ int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages, 
		}

		pages_disk[i] = pg;

		lock_page(pg);

		kmap(pg);

	}



	/* Read 'ondisk_size' bytes from disk. */
@@ -2640,7 +2639,6 @@ int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages, 
	for (i = 0; i < npages_disk; i++) {

		pg = pages_disk[i];

		if (pg) {

			kunmap(pg);

			unlock_page(pg);

			put_page(pg);

		}
@@ -2735,7 +2733,6 @@ int ni_write_frame(struct ntfs_inode *ni, struct page **pages, 
		}

		pages_disk[i] = pg;

		lock_page(pg);

		kmap(pg);

	}



	/* To simplify compress algorithm do vmap for source and target pages. */
@@ -2823,7 +2820,6 @@ int ni_write_frame(struct ntfs_inode *ni, struct page **pages, 
	for (i = 0; i < pages_per_frame; i++) {

		pg = pages_disk[i];

		if (pg) {

			kunmap(pg);

			unlock_page(pg);

			put_page(pg);

		}