Make sure that highmem pages are not added to symlink page cache
inode_nohighmem() is sufficient to make sure that page_get_link()
won't try to allocate a highmem page. Moreover, it is sufficient
to make sure that page_symlink/__page_symlink won't do the same
thing. However, any filesystem that manually preseeds the symlink's
page cache upon symlink(2) needs to make sure that the page it
inserts there won't be a highmem one.
Fortunately, only nfs and shmem have run afoul of that...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/mm/shmem.c b/mm/shmem.c
index 5813b7f..642471b 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2469,6 +2469,7 @@
inode->i_op = &shmem_short_symlink_operations;
inode->i_link = info->symlink;
} else {
+ inode_nohighmem(inode);
error = shmem_getpage(inode, 0, &page, SGP_WRITE, NULL);
if (error) {
iput(inode);
@@ -2476,7 +2477,6 @@
}
inode->i_mapping->a_ops = &shmem_aops;
inode->i_op = &shmem_symlink_inode_operations;
- inode_nohighmem(inode);
memcpy(page_address(page), symname, len);
SetPageUptodate(page);
set_page_dirty(page);
