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authorAl Viro <viro@zeniv.linux.org.uk>2015-11-18 05:14:24 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-09 06:41:55 +0300
commit0d0def49d05ae988936268b0e57d19aeef8c3ad2 (patch)
tree471fbf67f67815197aea2540650ee73d754b40ac /fs/nfs/symlink.c
parent1a384eaac265b57961c9696d9177f82eb84319e9 (diff)
downloadlinux-0d0def49d05ae988936268b0e57d19aeef8c3ad2.tar.xz
teach nfs_get_link() to work in RCU mode
based upon the corresponding patch from Neil's March patchset, again with kmap-related horrors removed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfs/symlink.c')
-rw-r--r--fs/nfs/symlink.c30
1 files changed, 20 insertions, 10 deletions
diff --git a/fs/nfs/symlink.c b/fs/nfs/symlink.c
index 8ade8a812607..95c69af7e4d0 100644
--- a/fs/nfs/symlink.c
+++ b/fs/nfs/symlink.c
@@ -48,16 +48,26 @@ static const char *nfs_get_link(struct dentry *dentry,
struct page *page;
void *err;
- if (!dentry)
- return ERR_PTR(-ECHILD);
-
- err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
- if (err)
- return err;
- page = read_cache_page(&inode->i_data, 0,
- (filler_t *)nfs_symlink_filler, inode);
- if (IS_ERR(page))
- return ERR_CAST(page);
+ if (!dentry) {
+ err = ERR_PTR(nfs_revalidate_mapping_rcu(inode));
+ if (err)
+ return err;
+ page = find_get_page(inode->i_mapping, 0);
+ if (!page)
+ return ERR_PTR(-ECHILD);
+ if (!PageUptodate(page)) {
+ put_page(page);
+ return ERR_PTR(-ECHILD);
+ }
+ } else {
+ err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
+ if (err)
+ return err;
+ page = read_cache_page(&inode->i_data, 0,
+ (filler_t *)nfs_symlink_filler, inode);
+ if (IS_ERR(page))
+ return ERR_CAST(page);
+ }
*cookie = page;
return page_address(page);
}