Commit 9150c3ad authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Steve French
Browse files

CIFS: Close open handle after interrupted close 



If Close command is interrupted before sending a request
to the server the client ends up leaking an open file
handle. This wastes server resources and can potentially
block applications that try to remove the file or any
directory containing this file.

Fix this by putting the close command into a worker queue,
so another thread retries it later.

Cc: Stable <stable@vger.kernel.org>
Tested-by: default avatarFrank Sorenson <sorenson@redhat.com>
Reviewed-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: default avatarPavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 44805b0e

fs/cifs/smb2misc.c

+45 −14
Original line number Diff line number Diff line
@@ -738,36 +738,67 @@ smb2_cancelled_close_fid(struct work_struct *work) 
	kfree(cancelled);

}



/* Caller should already has an extra reference to @tcon */

static int

__smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,

			      __u64 volatile_fid)

{

	struct close_cancelled_open *cancelled;



	cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);

	if (!cancelled)

		return -ENOMEM;



	cancelled->fid.persistent_fid = persistent_fid;

	cancelled->fid.volatile_fid = volatile_fid;

	cancelled->tcon = tcon;

	INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);

	WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false);



	return 0;

}



int

smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,

			    __u64 volatile_fid)

{

	int rc;



	cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);

	spin_lock(&cifs_tcp_ses_lock);

	tcon->tc_count++;

	spin_unlock(&cifs_tcp_ses_lock);



	rc = __smb2_handle_cancelled_close(tcon, persistent_fid, volatile_fid);

	if (rc)

		cifs_put_tcon(tcon);



	return rc;

}



int

smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)

{

	struct smb2_sync_hdr *sync_hdr = (struct smb2_sync_hdr *)buffer;

	struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;

	struct cifs_tcon *tcon;

	struct close_cancelled_open *cancelled;

	int rc;



	if (sync_hdr->Command != SMB2_CREATE ||

	    sync_hdr->Status != STATUS_SUCCESS)

		return 0;



	cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);

	if (!cancelled)

		return -ENOMEM;



	tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,

				  sync_hdr->TreeId);

	if (!tcon) {

		kfree(cancelled);

	if (!tcon)

		return -ENOENT;

	}



	cancelled->fid.persistent_fid = rsp->PersistentFileId;

	cancelled->fid.volatile_fid = rsp->VolatileFileId;

	cancelled->tcon = tcon;

	INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);

	queue_work(cifsiod_wq, &cancelled->work);

	rc = __smb2_handle_cancelled_close(tcon, rsp->PersistentFileId,

					   rsp->VolatileFileId);

	if (rc)

		cifs_put_tcon(tcon);



	return 0;

	return rc;

}



/**

fs/cifs/smb2pdu.c

+15 −1
Original line number Diff line number Diff line
@@ -2974,7 +2974,21 @@ int 
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,

	   u64 persistent_fid, u64 volatile_fid)

{

	return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);

	int rc;

	int tmp_rc;



	rc = SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);



	/* retry close in a worker thread if this one is interrupted */

	if (rc == -EINTR) {

		tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,

						     volatile_fid);

		if (tmp_rc)

			cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",

				 persistent_fid, tmp_rc);

	}



	return rc;

}



int

fs/cifs/smb2proto.h

+3 −0
Original line number Diff line number Diff line
@@ -212,6 +212,9 @@ extern int SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 
extern int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,

			     const u64 persistent_fid, const u64 volatile_fid,

			     const __u8 oplock_level);

extern int smb2_handle_cancelled_close(struct cifs_tcon *tcon,

				       __u64 persistent_fid,

				       __u64 volatile_fid);

extern int smb2_handle_cancelled_mid(char *buffer,

					struct TCP_Server_Info *server);

void smb2_cancelled_close_fid(struct work_struct *work);

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