[PATCH 49/97] callers of iov_copy_from_user_atomic() don't need pagecache_disable()
From: Mel Gorman <mgorman@suse.de>
Date: 2014-08-28 18:57:21
Also in:
lkml
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), fuse filesystem [core], memory management, page cache, the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Miklos Szeredi, Andrew Morton, Matthew Wilcox, Jan Kara, Linus Torvalds
From: Al Viro <viro@zeniv.linux.org.uk> commit 9e8c2af96e0d2d5fe298dd796fb6bc16e888a48d upstream. ... it does that itself (via kmap_atomic()) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Mel Gorman <mgorman@suse.de> --- fs/btrfs/file.c | 5 ----- fs/fuse/file.c | 2 -- mm/filemap.c | 3 --- 3 files changed, 10 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 72da4df..9952a2a 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c@@ -426,13 +426,8 @@ static noinline int btrfs_copy_from_user(loff_t pos, int num_pages, struct page *page = prepared_pages[pg]; /* * Copy data from userspace to the current page - * - * Disable pagefault to avoid recursive lock since - * the pages are already locked */ - pagefault_disable(); copied = iov_iter_copy_from_user_atomic(page, i, offset, count); - pagefault_enable(); /* Flush processor's dcache for this page */ flush_dcache_page(page);
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 4598345..bf9a755 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c@@ -985,9 +985,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req, if (mapping_writably_mapped(mapping)) flush_dcache_page(page); - pagefault_disable(); tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); - pagefault_enable(); flush_dcache_page(page); mark_page_accessed(page);
diff --git a/mm/filemap.c b/mm/filemap.c
index d0f765f..8144c27 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c@@ -2190,7 +2190,6 @@ size_t iov_iter_copy_from_user_atomic(struct page *page, char *kaddr; size_t copied; - BUG_ON(!in_atomic()); kaddr = kmap_atomic(page); if (likely(i->nr_segs == 1)) { int left;
@@ -2564,9 +2563,7 @@ again: if (mapping_writably_mapped(mapping)) flush_dcache_page(page); - pagefault_disable(); copied = iov_iter_copy_from_user_atomic(page, i, offset, bytes); - pagefault_enable(); flush_dcache_page(page); mark_page_accessed(page);
--
1.8.4.5