From: Pavel Shilovsky <piastry@xxxxxxxxxxx>
Signed-off-by: Pavel Shilovsky <piastry@xxxxxxxxxxx>
---
fs/cifs/cifsproto.h | 1 +
fs/cifs/cifssmb.c | 21 +++++---
fs/cifs/connect.c | 3 +
fs/cifs/smb2pdu.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 143 insertions(+), 9 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 692d283..3426175 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -171,6 +171,7 @@ extern struct smb_vol *cifs_get_volume_info(char *mount_data,
const char *devname);
extern int cifs_mount(struct cifs_sb_info *, struct smb_vol *);
extern void cifs_umount(struct cifs_sb_info *);
+extern void cifs_mark_open_files_invalid(struct cifs_tcon *tcon);
#if IS_ENABLED(CONFIG_CIFS_DFS_UPCALL)
extern void cifs_dfs_release_automount_timer(void);
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 409f5b0..19c3e56 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -112,24 +112,29 @@ cifs_kmap_unlock(void)
#define cifs_kmap_unlock() do { ; } while(0)
#endif /* CONFIG_HIGHMEM */
-/* Mark as invalid, all open files on tree connections since they
- were closed when session to server was lost */
-static void mark_open_files_invalid(struct cifs_tcon *pTcon)
+/*
+ * Mark as invalid, all open files on tree connections since they
+ * were closed when session to server was lost.
+ */
+void
+cifs_mark_open_files_invalid(struct cifs_tcon *tcon)
{
struct cifsFileInfo *open_file = NULL;
struct list_head *tmp;
struct list_head *tmp1;
-/* list all files open on tree connection and mark them invalid */
+ /* list all files open on tree connection and mark them invalid */
spin_lock(&cifs_file_list_lock);
- list_for_each_safe(tmp, tmp1, &pTcon->openFileList) {
+ list_for_each_safe(tmp, tmp1, &tcon->openFileList) {
open_file = list_entry(tmp, struct cifsFileInfo, tlist);
open_file->invalidHandle = true;
open_file->oplock_break_cancelled = true;
}
spin_unlock(&cifs_file_list_lock);
- /* BB Add call to invalidate_inodes(sb) for all superblocks mounted
- to this tcon */
+ /*
+ * BB Add call to invalidate_inodes(sb) for all superblocks mounted
+ * to this tcon.
+ */
}
/* reconnect the socket, tcon, and smb session if needed */
@@ -209,7 +214,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
goto out;
}
- mark_open_files_invalid(tcon);
+ cifs_mark_open_files_invalid(tcon);
rc = CIFSTCon(0, ses, tcon->treeName, tcon, nls_codepage);
mutex_unlock(&ses->session_mutex);
cFYI(1, "reconnect tcon rc = %d", rc);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index c19caa7..dc3383a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -316,6 +316,9 @@ cifs_reconnect(struct TCP_Server_Info *server)
server->tcpStatus = CifsNeedReconnect;
spin_unlock(&GlobalMid_Lock);
server->maxBuf = 0;
+#ifdef CONFIG_CIFS_SMB2
+ server->max_read = 0;
+#endif
cFYI(1, "Reconnecting tcp session");
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 1bf037e..48c04b2 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -127,7 +127,132 @@ static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
{
int rc = 0;
- /* BB add missing code here */
+ struct nls_table *nls_codepage;
+ struct cifs_ses *ses;
+ struct TCP_Server_Info *server;
+
+ /*
+ * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
+ * check for tcp and smb session status done differently
+ * for those three - in the calling routine.
+ */
+ if (tcon == NULL)
+ return rc;
+
+ if (smb2_command == SMB2_TREE_CONNECT)
+ return rc;
+
+ if (tcon->tidStatus == CifsExiting) {
+ /*
+ * only tree disconnect, open, and write,
+ * (and ulogoff which does not have tcon)
+ * are allowed as we start force umount.
+ */
+ if ((smb2_command != SMB2_WRITE) &&
+ (smb2_command != SMB2_CREATE) &&
+ (smb2_command != SMB2_TREE_DISCONNECT)) {
+ cFYI(1, "can not send cmd %d while umounting",
+ smb2_command);
+ return -ENODEV;
+ }
+ }
+ if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
+ (!tcon->ses->server))
+ return -EIO;
+
+ ses = tcon->ses;
+ server = ses->server;
+
+ /*
+ * Give demultiplex thread up to 10 seconds to reconnect, should be
+ * greater than cifs socket timeout which is 7 seconds
+ */
+ while (server->tcpStatus == CifsNeedReconnect) {
+ /*
+ * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
+ * here since they are implicitly done when session drops.
+ */
+ switch (smb2_command) {
+ /*
+ * BB Should we keep oplock break and add flush to exceptions?
+ */
+ case SMB2_TREE_DISCONNECT:
+ case SMB2_CANCEL:
+ case SMB2_CLOSE:
+ case SMB2_OPLOCK_BREAK:
+ return -EAGAIN;
+ }
+
+ wait_event_interruptible_timeout(server->response_q,
+ (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
+
+ /* are we still trying to reconnect? */
+ if (server->tcpStatus != CifsNeedReconnect)
+ break;
+
+ /*
+ * on "soft" mounts we wait once. Hard mounts keep
+ * retrying until process is killed or server comes
+ * back on-line
+ */
+ if (!tcon->retry) {
+ cFYI(1, "gave up waiting on reconnect in smb_init");
+ return -EHOSTDOWN;
+ }
+ }
+
+ if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
+ return rc;
+
+ nls_codepage = load_nls_default();
+
+ /*
+ * need to prevent multiple threads trying to simultaneously reconnect
+ * the same SMB session
+ */
+ mutex_lock(&tcon->ses->session_mutex);
+ rc = cifs_negotiate_protocol(0, tcon->ses);
+ if (!rc && tcon->ses->need_reconnect)
+ rc = cifs_setup_session(0, tcon->ses, nls_codepage);
+
+ if (rc || !tcon->need_reconnect) {
+ mutex_unlock(&tcon->ses->session_mutex);
+ goto out;
+ }
+
+ cifs_mark_open_files_invalid(tcon);
+ rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
+ mutex_unlock(&tcon->ses->session_mutex);
+ cFYI(1, "reconnect tcon rc = %d", rc);
+ if (rc)
+ goto out;
+ atomic_inc(&tconInfoReconnectCount);
+ /*
+ * BB FIXME add code to check if wsize needs update due to negotiated
+ * smb buffer size shrinking.
+ */
+out:
+ /*
+ * Check if handle based operation so we know whether we can continue
+ * or not without returning to caller to reset file handle.
+ */
+ /*
+ * BB Is flush done by server on drop of tcp session? Should we special
+ * case it and skip above?
+ */
+ switch (smb2_command) {
+ case SMB2_FLUSH:
+ case SMB2_READ:
+ case SMB2_WRITE:
+ case SMB2_LOCK:
+ case SMB2_IOCTL:
+ case SMB2_QUERY_DIRECTORY:
+ case SMB2_CHANGE_NOTIFY:
+ case SMB2_QUERY_INFO:
+ case SMB2_SET_INFO:
+ return -EAGAIN;
+ }
+ unload_nls(nls_codepage);
return rc;
}
--
1.7.1
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