don't put symlink bodies in pagecache into highmem
kmap() in page_follow_link_light() needed to go - allowing to hold
an arbitrary number of kmaps for long is a great way to deadlocking
the system.
new helper (inode_nohighmem(inode)) needs to be used for pagecache
symlinks inodes; done for all in-tree cases. page_follow_link_light()
instrumented to yell about anything missed.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/efs/symlink.c b/fs/efs/symlink.c
index 75117d0..4870cc8 100644
--- a/fs/efs/symlink.c
+++ b/fs/efs/symlink.c
@@ -13,7 +13,7 @@
static int efs_symlink_readpage(struct file *file, struct page *page)
{
- char *link = kmap(page);
+ char *link = page_address(page);
struct buffer_head * bh;
struct inode * inode = page->mapping->host;
efs_block_t size = inode->i_size;
@@ -39,12 +39,10 @@
}
link[size] = '\0';
SetPageUptodate(page);
- kunmap(page);
unlock_page(page);
return 0;
fail:
SetPageError(page);
- kunmap(page);
unlock_page(page);
return err;
}