cifs: have cifsFileInfo hold a reference to a tlink rather than tcon pointer

[mirror_ubuntu-artful-kernel.git] / fs / cifs / cifsglob.h

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index c9d0cfc086ebcb609b504afdec6431e89ac75db9..d5324853203b31489d2cb6875f3d8ade3ca65a77 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -25,9 +25,6 @@
 #include <linux/workqueue.h>
 #include "cifs_fs_sb.h"
 #include "cifsacl.h"
-#include <crypto/internal/hash.h>
-#include <linux/scatterlist.h>
-
 /*
  * The sizes of various internal tables and strings
  */
@@ -123,21 +120,6 @@ struct cifs_cred {
        struct cifs_ace *aces;
 };
 
-struct sdesc {
-       struct shash_desc shash;
-       char ctx[];
-};
-
-struct ntlmssp_auth {
-       __u32 client_flags;
-       __u32 server_flags;
-       unsigned char ciphertext[CIFS_CPHTXT_SIZE];
-       struct crypto_shash *hmacmd5;
-       struct crypto_shash *md5;
-       struct sdesc *sdeschmacmd5;
-       struct sdesc *sdescmd5;
-};
-
 /*
  *****************************************************************
  * Except the CIFS PDUs themselves all the
@@ -157,6 +139,7 @@ struct TCP_Server_Info {
                struct sockaddr_in sockAddr;
                struct sockaddr_in6 sockAddr6;
        } addr;
+       struct sockaddr_storage srcaddr; /* locally bind to this IP */
        wait_queue_head_t response_q;
        wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
        struct list_head pending_mid_q;
@@ -205,9 +188,6 @@ struct TCP_Server_Info {
        unsigned long lstrp; /* when we got last response from this server */
        u16 dialect; /* dialect index that server chose */
        /* extended security flavors that server supports */
-       unsigned int tilen; /* length of the target info blob */
-       unsigned char *tiblob; /* target info blob in challenge response */
-       struct ntlmssp_auth ntlmssp; /* various keys, ciphers, flags */
        bool    sec_kerberos;           /* supports plain Kerberos */
        bool    sec_mskerberos;         /* supports legacy MS Kerberos */
        bool    sec_kerberosu2u;        /* supports U2U Kerberos */
@@ -243,6 +223,8 @@ struct cifsSesInfo {
        char userName[MAX_USERNAME_SIZE + 1];
        char *domainName;
        char *password;
+       unsigned int tilen; /* length of the target info blob */
+       unsigned char *tiblob; /* target info blob in challenge response */
        bool need_reconnect:1; /* connection reset, uid now invalid */
 };
 /* no more than one of the following three session flags may be set */
@@ -328,6 +310,50 @@ struct cifsTconInfo {
        /* BB add field for back pointer to sb struct(s)? */
 };
 
+/*
+ * This is a refcounted and timestamped container for a tcon pointer. The
+ * container holds a tcon reference. It is considered safe to free one of
+ * these when the tl_count goes to 0. The tl_time is the time of the last
+ * "get" on the container.
+ */
+struct tcon_link {
+       spinlock_t              tl_lock;
+       u32                     tl_count;
+       u64                     tl_time;
+       struct cifsTconInfo     *tl_tcon;
+};
+
+static inline struct tcon_link *
+cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
+{
+       return (struct tcon_link *)cifs_sb->ptcon;
+}
+
+static inline struct cifsTconInfo *
+tlink_tcon(struct tcon_link *tlink)
+{
+       return (struct cifsTconInfo *)tlink;
+}
+
+static inline void
+cifs_put_tlink(struct tcon_link *tlink)
+{
+       return;
+}
+
+static inline struct tcon_link *
+cifs_get_tlink(struct tcon_link *tlink)
+{
+       return tlink;
+}
+
+/* This function is always expected to succeed */
+static inline struct cifsTconInfo *
+cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
+{
+       return cifs_sb->ptcon;
+}
+
 /*
  * This info hangs off the cifsFileInfo structure, pointed to by llist.
  * This is used to track byte stream locks on the file
@@ -369,6 +395,7 @@ struct cifsFileInfo {
        struct file *pfile; /* needed for writepage */
        struct inode *pInode; /* needed for oplock break */
        struct vfsmount *mnt;
+       struct tcon_link *tlink;
        struct mutex lock_mutex;
        struct list_head llist; /* list of byte range locks we have. */
        bool closePend:1;       /* file is marked to close */
@@ -390,6 +417,7 @@ static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
 static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
 {
        if (atomic_dec_and_test(&cifs_file->count)) {
+               cifs_put_tlink(cifs_file->tlink);
                iput(cifs_file->pInode);
                kfree(cifs_file);
        }