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teach page_get_link() to work in RCU mode

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more or less along the lines of Neil's patchset, sans the insanity
around kmap().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-11-17 10:41:04 -05:00
parent 6b2553918d
commit d3883d4f93
1 changed files with 13 additions and 6 deletions
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19
fs/namei.c
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@ -4533,12 +4533,19 @@ const char *page_get_link(struct dentry *dentry, struct inode *inode,
struct page *page;
struct address_space *mapping = inode->i_mapping;
if (!dentry)
return ERR_PTR(-ECHILD);
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
return (char*)page;
if (!dentry) {
page = find_get_page(mapping, 0);
if (!page)
return ERR_PTR(-ECHILD);
if (!PageUptodate(page)) {
put_page(page);
return ERR_PTR(-ECHILD);
}
} else {
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
return (char*)page;
}
*cookie = page;
BUG_ON(mapping_gfp_mask(mapping) & __GFP_HIGHMEM);
kaddr = page_address(page);