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authorAl Viro <viro@zeniv.linux.org.uk>2015-11-17 18:20:54 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-09 06:41:54 +0300
commit6b2553918d8b4e6de9853fd6315bec7271a2e592 (patch)
tree85540dcb0dc0de3d67c68d0aa7b17058f4e96539 /fs/nfs
parent21fc61c73c3903c4c312d0802da01ec2b323d174 (diff)
downloadlinux-6b2553918d8b4e6de9853fd6315bec7271a2e592.tar.xz
replace ->follow_link() with new method that could stay in RCU mode
new method: ->get_link(); replacement of ->follow_link(). The differences are: * inode and dentry are passed separately * might be called both in RCU and non-RCU mode; the former is indicated by passing it a NULL dentry. * when called that way it isn't allowed to block and should return ERR_PTR(-ECHILD) if it needs to be called in non-RCU mode. It's a flagday change - the old method is gone, all in-tree instances converted. Conversion isn't hard; said that, so far very few instances do not immediately bail out when called in RCU mode. That'll change in the next commits. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/symlink.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/nfs/symlink.c b/fs/nfs/symlink.c
index abd93bf015d6..8ade8a812607 100644
--- a/fs/nfs/symlink.c
+++ b/fs/nfs/symlink.c
@@ -42,12 +42,15 @@ error:
return -EIO;
}
-static const char *nfs_follow_link(struct dentry *dentry, void **cookie)
+static const char *nfs_get_link(struct dentry *dentry,
+ struct inode *inode, void **cookie)
{
- struct inode *inode = d_inode(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;
@@ -64,7 +67,7 @@ static const char *nfs_follow_link(struct dentry *dentry, void **cookie)
*/
const struct inode_operations nfs_symlink_inode_operations = {
.readlink = generic_readlink,
- .follow_link = nfs_follow_link,
+ .get_link = nfs_get_link,
.put_link = page_put_link,
.getattr = nfs_getattr,
.setattr = nfs_setattr,