From 14656154d26cf244d063477a03606775eec19780 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Fri, 18 Jul 2025 20:53:56 +0100 Subject: [PATCH] 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: Matthew Wilcox (Oracle) Signed-off-by: Konstantin Komarov --- fs/ntfs3/frecord.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c index c1c2ddaeb1e7..784291ae04e6 100644 --- a/fs/ntfs3/frecord.c +++ b/fs/ntfs3/frecord.c @@ -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); }