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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/cifs/link.c
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/cifs/link.c')
-rw-r--r--fs/cifs/link.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index e3548f73bdea..6f2439b508b5 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -627,9 +627,8 @@ cifs_hl_exit:
}
const char *
-cifs_follow_link(struct dentry *direntry, void **cookie)
+cifs_get_link(struct dentry *direntry, struct inode *inode, void **cookie)
{
- struct inode *inode = d_inode(direntry);
int rc = -ENOMEM;
unsigned int xid;
char *full_path = NULL;
@@ -639,6 +638,9 @@ cifs_follow_link(struct dentry *direntry, void **cookie)
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
+ if (!direntry)
+ return ERR_PTR(-ECHILD);
+
xid = get_xid();
tlink = cifs_sb_tlink(cifs_sb);