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authorAl Viro <viro@zeniv.linux.org.uk>2015-11-17 10:20:54 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-08 22:41:54 -0500
commit6b2553918d8b4e6de9853fd6315bec7271a2e592 (patch)
tree85540dcb0dc0de3d67c68d0aa7b17058f4e96539 /fs/configfs
parent21fc61c73c3903c4c312d0802da01ec2b323d174 (diff)
downloadlinux-6b2553918d8b4e6de9853fd6315bec7271a2e592.tar.bz2
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/configfs')
-rw-r--r--fs/configfs/symlink.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index ec5c8325b503..b91c01ebb688 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -279,11 +279,16 @@ static int configfs_getlink(struct dentry *dentry, char * path)
}
-static const char *configfs_follow_link(struct dentry *dentry, void **cookie)
+static const char *configfs_get_link(struct dentry *dentry,
+ struct inode *inode, void **cookie)
{
- unsigned long page = get_zeroed_page(GFP_KERNEL);
+ unsigned long page;
int error;
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+
+ page = get_zeroed_page(GFP_KERNEL);
if (!page)
return ERR_PTR(-ENOMEM);
@@ -297,7 +302,7 @@ static const char *configfs_follow_link(struct dentry *dentry, void **cookie)
}
const struct inode_operations configfs_symlink_inode_operations = {
- .follow_link = configfs_follow_link,
+ .get_link = configfs_get_link,
.readlink = generic_readlink,
.put_link = free_page_put_link,
.setattr = configfs_setattr,