Unverified Commit 953b79a7 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Konstantin Komarov
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ntfs: Do not kmap page cache pages for compression 



These pages are accessed through 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 14656154

fs/ntfs3/frecord.c

+0 −11
Original line number Diff line number Diff line
@@ -2407,9 +2407,6 @@ int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages, 
	 * To simplify decompress algorithm do vmap for source

	 * and target pages.

	 */

	for (i = 0; i < pages_per_frame; i++)

		kmap(pages[i]);



	frame_size = pages_per_frame << PAGE_SHIFT;

	frame_mem = vmap(pages, pages_per_frame, VM_MAP, PAGE_KERNEL);

	if (!frame_mem) {
@@ -2655,7 +2652,6 @@ int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages, 
out:

	for (i = 0; i < pages_per_frame; i++) {

		pg = pages[i];

		kunmap(pg);

		SetPageUptodate(pg);

	}
@@ -2742,9 +2738,6 @@ int ni_write_frame(struct ntfs_inode *ni, struct page **pages, 
		goto out1;

	}



	for (i = 0; i < pages_per_frame; i++)

		kmap(pages[i]);



	/* Map in-memory frame for read-only. */

	frame_mem = vmap(pages, pages_per_frame, VM_MAP, PAGE_KERNEL_RO);

	if (!frame_mem) {
@@ -2810,11 +2803,7 @@ int ni_write_frame(struct ntfs_inode *ni, struct page **pages, 


out3:

	vunmap(frame_mem);



out2:

	for (i = 0; i < pages_per_frame; i++)

		kunmap(pages[i]);



	vunmap(frame_ondisk);

out1:

	for (i = 0; i < pages_per_frame; i++) {