Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 151 insertions, 0 deletions

diff --git a/fs/lockd/svcshare.c b/fs/lockd/svcshare.c
new file mode 100644
index 000000000..a58b7035b
--- /dev/null
+++ b/fs/lockd/svcshare.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/lockd/svcshare.c
+ *
+ * Management of DOS shares.
+ *
+ * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/time.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+
+#include "lockd.h"
+#include "share.h"
+
+static inline int
+nlm_cmp_owner(struct lockd_share *share, struct xdr_netobj *oh)
+{
+	return share->s_owner.len == oh->len
+	    && !memcmp(share->s_owner.data, oh->data, oh->len);
+}
+
+/*
+ * Recompute s_access / s_mode as the union of every (access, deny) pair
+ * whose bit is currently set in s_access_deny_bmap.
+ */
+static void nlm_recompute_share(struct lockd_share *share)
+{
+	u32 new_access = 0, new_mode = 0;
+	unsigned int i;
+
+	for (i = 0; i < 16; i++) {
+		if (share->s_access_deny_bmap & BIT(i)) {
+			new_access |= i >> 2;
+			new_mode   |= i & 3;
+		}
+	}
+	share->s_access = new_access;
+	share->s_mode = new_mode;
+}
+
+/**
+ * nlmsvc_share_file - create a share
+ * @host: Network client peer
+ * @file: File to be shared
+ * @oh: Share owner handle
+ * @access: Requested access mode
+ * @mode: Requested file sharing mode
+ *
+ * Returns an NLM status code.
+ */
+__be32
+nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file,
+		  struct xdr_netobj *oh, u32 access, u32 mode)
+{
+	struct lockd_share	*share;
+	u8			*ohdata;
+
+	if (nlmsvc_file_cannot_lock(file))
+		return nlm_lck_denied_nolocks;
+
+	for (share = file->f_shares; share; share = share->s_next) {
+		if (share->s_host == host && nlm_cmp_owner(share, oh))
+			goto update;
+		if ((access & share->s_mode) || (mode & share->s_access))
+			return nlm_lck_denied;
+	}
+
+	share = kmalloc(sizeof(*share) + oh->len, GFP_KERNEL);
+	if (share == NULL)
+		return nlm_lck_denied_nolocks;
+
+	/* Copy owner handle */
+	ohdata = (u8 *) (share + 1);
+	memcpy(ohdata, oh->data, oh->len);
+
+	share->s_file	    = file;
+	share->s_host       = host;
+	share->s_owner.data = ohdata;
+	share->s_owner.len  = oh->len;
+	share->s_access_deny_bmap  = 0;
+	share->s_next       = file->f_shares;
+	file->f_shares      = share;
+
+update:
+	share->s_access_deny_bmap |= LOCKD_FSH_BIT(access, mode);
+	nlm_recompute_share(share);
+	return nlm_granted;
+}
+
+/**
+ * nlmsvc_unshare_file - delete a share
+ * @host: Network client peer
+ * @file: File to be unshared
+ * @oh: Share owner handle
+ * @access: Access mode of the SHARE being released
+ * @mode: Deny mode of the SHARE being released
+ *
+ * Returns an NLM status code.
+ */
+__be32
+nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file,
+		    struct xdr_netobj *oh, u32 access, u32 mode)
+{
+	struct lockd_share	*share, **shpp;
+
+	if (nlmsvc_file_cannot_lock(file))
+		return nlm_lck_denied_nolocks;
+
+	for (shpp = &file->f_shares; (share = *shpp) != NULL;
+					shpp = &share->s_next) {
+		if (share->s_host == host && nlm_cmp_owner(share, oh)) {
+			share->s_access_deny_bmap &= ~LOCKD_FSH_BIT(access, mode);
+			nlm_recompute_share(share);
+			if (!share->s_access_deny_bmap) {
+				*shpp = share->s_next;
+				kfree(share);
+			}
+			return nlm_granted;
+		}
+	}
+
+	/* X/Open spec says return success even if there was no
+	 * corresponding share. */
+	return nlm_granted;
+}
+
+/*
+ * Traverse all shares for a given file, and delete
+ * those owned by the given (type of) host
+ */
+void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file,
+		nlm_host_match_fn_t match)
+{
+	struct lockd_share	*share, **shpp;
+
+	shpp = &file->f_shares;
+	while ((share = *shpp) !=  NULL) {
+		if (match(share->s_host, host)) {
+			*shpp = share->s_next;
+			kfree(share);
+			continue;
+		}
+		shpp = &share->s_next;
+	}
+}