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authorPavel Shilovsky <pshilovsky@samba.org>2013-08-14 19:25:21 +0400
committerSteve French <smfrench@gmail.com>2013-09-08 14:27:34 -0500
commitb42bf88828cde60772dc08201d0a4f1a0663d7bc (patch)
tree3b019e905c83aba6578b56ae5a49669f59db23cf /fs/cifs/link.c
parent3ae35cde67c1ec50267bcc55d81f4953b5f637c2 (diff)
downloadlinux-b42bf88828cde60772dc08201d0a4f1a0663d7bc.tar.bz2
CIFS: Implement follow_link for SMB2
that allows to access files through symlink created on a server. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/link.c')
-rw-r--r--fs/cifs/link.c24
1 files changed, 5 insertions, 19 deletions
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 562044f700e5..7e36ceba0c7a 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -509,6 +509,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink = NULL;
struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
xid = get_xid();
@@ -519,25 +520,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
goto out;
}
tcon = tlink_tcon(tlink);
-
- /*
- * For now, we just handle symlinks with unix extensions enabled.
- * Eventually we should handle NTFS reparse points, and MacOS
- * symlink support. For instance...
- *
- * rc = CIFSSMBQueryReparseLinkInfo(...)
- *
- * For now, just return -EACCES when the server doesn't support posix
- * extensions. Note that we still allow querying symlinks when posix
- * extensions are manually disabled. We could disable these as well
- * but there doesn't seem to be any harm in allowing the client to
- * read them.
- */
- if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
- !cap_unix(tcon->ses)) {
- rc = -EACCES;
- goto out;
- }
+ server = tcon->ses->server;
full_path = build_path_from_dentry(direntry);
if (!full_path)
@@ -559,6 +542,9 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
if ((rc != 0) && cap_unix(tcon->ses))
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
cifs_sb->local_nls);
+ else if (rc != 0 && server->ops->query_symlink)
+ rc = server->ops->query_symlink(xid, tcon, full_path,
+ &target_path, cifs_sb);
kfree(full_path);
out: