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[CIFS] redo existing session setup if needed in cifs_mount 

When cifs_mount finds an existing SMB session that it can use for a new
mount, it does not check to see whether that session is in need of being
reconnected. An easy way to reproduce:

1) mount //server/share1
2) watch /proc/fs/cifs/DebugData for the share to go DISCONNECTED
3) mount //server/share2 with same creds as in step 1.

The second mount will fail because CIFSTCon returned -EAGAIN. If you do
an operation in share1 and then reattempt the mount it will work (since
the session is reestablished).

The following patch fixes this by having cifs_mount check the status
of the session when it picks an existing session and calling
cifs_setup_session on it again if it's in need of reconnection.

Thanks to Wojciech Pilorz for the initial bug report.

Signed-off-by: Jeff Layton <jlayton@tupile.poochiereds.net>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2007-12-31 01:37:11 +00:00 committed by Steve French
parent 05b3de63da
commit 1d9a8852c3
2 changed files with 11 additions and 2 deletions
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3
fs/cifs/CHANGES
View File

@ -3,7 +3,8 @@ Version 1.52
Fix oops on second mount to server when null auth is used.
Enable experimental Kerberos support. Return writebehind errors on flush
and sync so that events like out of disk space get reported properly on
cached files. Fix setxattr failure to certain Samba versions.
cached files. Fix setxattr failure to certain Samba versions. Fix mount
of second share to disconnected server session (autoreconnect on this).
Version 1.51
------------

10
fs/cifs/connect.c
View File

@ -1964,7 +1964,15 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
if (existingCifsSes) {
pSesInfo = existingCifsSes;
cFYI(1, ("Existing smb sess found"));
cFYI(1, ("Existing smb sess found (status=%d)",
pSesInfo->status));
if (pSesInfo->status == CifsNeedReconnect) {
cFYI(1, ("Session needs reconnect"));
down(&pSesInfo->sesSem);
rc = cifs_setup_session(xid, pSesInfo,
cifs_sb->local_nls);
up(&pSesInfo->sesSem);
}
} else if (!rc) {
cFYI(1, ("Existing smb sess not found"));
pSesInfo = sesInfoAlloc();