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authorAl Viro <viro@zeniv.linux.org.uk>2014-02-02 22:10:25 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2014-04-01 23:19:20 -0400
commit9e8c2af96e0d2d5fe298dd796fb6bc16e888a48d (patch)
treebd078fdfaf34ce0cb9ab258d39f0669b5610f5c8
parentc186afb4dbd0050a537b96c7fbee2dba3b57fc38 (diff)
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callers of iov_copy_from_user_atomic() don't need pagecache_disable()
... it does that itself (via kmap_atomic()) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/btrfs/file.c5
-rw-r--r--fs/fuse/file.c2
-rw-r--r--mm/filemap.c3
3 files changed, 0 insertions, 10 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 0165b8672f09..34e096201da1 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -425,13 +425,8 @@ 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 77bcc303c3ae..a91d3b4d32f3 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1003,9 +1003,7 @@ 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 46e98019af6c..bfb7a97d6d0f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1974,7 +1974,6 @@ 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;
@@ -2348,9 +2347,7 @@ 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);