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The crash happens rather often when we reset some cluster nodes while nodes contend fiercely to do truncate and append. The crash backtrace is below: dlm: C21CBDA5E0774F4BA5A9D4F317717495: dlm_recover_grant 1 locks on 971 resources dlm: C21CBDA5E0774F4BA5A9D4F317717495: dlm_recover 9 generation 5 done: 4 ms ocfs2: Begin replay journal (node 318952601, slot 2) on device (253,18) ocfs2: End replay journal (node 318952601, slot 2) on device (253,18) ocfs2: Beginning quota recovery on device (253,18) for slot 2 ocfs2: Finishing quota recovery on device (253,18) for slot 2 (truncate,30154,1):ocfs2_truncate_file:470 ERROR: bug expression: le64_to_cpu(fe->i_size) != i_size_read(inode) (truncate,30154,1):ocfs2_truncate_file:470 ERROR: Inode 290321, inode i_size = 732 != di i_size = 937, i_flags = 0x1 ------------[ cut here ]------------ kernel BUG at /usr/src/linux/fs/ocfs2/file.c:470! invalid opcode: 0000 [#1] SMP Modules linked in: ocfs2_stack_user(OEN) ocfs2(OEN) ocfs2_nodemanager ocfs2_stackglue(OEN) quota_tree dlm(OEN) configfs fuse sd_mod iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi af_packet iscsi_ibft iscsi_boot_sysfs softdog xfs libcrc32c ppdev parport_pc pcspkr parport joydev virtio_balloon virtio_net i2c_piix4 acpi_cpufreq button processor ext4 crc16 jbd2 mbcache ata_generic cirrus virtio_blk ata_piix drm_kms_helper ahci syscopyarea libahci sysfillrect sysimgblt fb_sys_fops ttm floppy libata drm virtio_pci virtio_ring uhci_hcd virtio ehci_hcd usbcore serio_raw usb_common sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua scsi_mod autofs4 Supported: No, Unsupported modules are loaded CPU: 1 PID: 30154 Comm: truncate Tainted: G OE N 4.4.21-69-default #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.1-0-g4adadbd-20151112_172657-sheep25 04/01/2014 task: ffff88004ff6d240 ti: ffff880074e68000 task.ti: ffff880074e68000 RIP: 0010:[<ffffffffa05c8c30>] [<ffffffffa05c8c30>] ocfs2_truncate_file+0x640/0x6c0 [ocfs2] RSP: 0018:ffff880074e6bd50 EFLAGS: 00010282 RAX: 0000000000000074 RBX: 000000000000029e RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000246 RDI: 0000000000000246 RBP: ffff880074e6bda8 R08: 000000003675dc7a R09: ffffffff82013414 R10: 0000000000034c50 R11: 0000000000000000 R12: ffff88003aab3448 R13: 00000000000002dc R14: 0000000000046e11 R15: 0000000000000020 FS: 00007f839f965700(0000) GS:ffff88007fc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007f839f97e000 CR3: 0000000036723000 CR4: 00000000000006e0 Call Trace: ocfs2_setattr+0x698/0xa90 [ocfs2] notify_change+0x1ae/0x380 do_truncate+0x5e/0x90 do_sys_ftruncate.constprop.11+0x108/0x160 entry_SYSCALL_64_fastpath+0x12/0x6d Code: 24 28 ba d6 01 00 00 48 c7 c6 30 43 62 a0 8b 41 2c 89 44 24 08 48 8b 41 20 48 c7 c1 78 a3 62 a0 48 89 04 24 31 c0 e8 a0 97 f9 ff <0f> 0b 3d 00 fe ff ff 0f 84 ab fd ff ff 83 f8 fc 0f 84 a2 fd ff RIP [<ffffffffa05c8c30>] ocfs2_truncate_file+0x640/0x6c0 [ocfs2] It's because ocfs2_inode_lock() get us stale LVB in which the i_size is not equal to the disk i_size. We mistakenly trust the LVB because the underlaying fsdlm dlm_lock() doesn't set lkb_sbflags with DLM_SBF_VALNOTVALID properly for us. But, why? The current code tries to downconvert lock without DLM_LKF_VALBLK flag to tell o2cb don't update RSB's LVB if it's a PR->NULL conversion, even if the lock resource type needs LVB. This is not the right way for fsdlm. The fsdlm plugin behaves different on DLM_LKF_VALBLK, it depends on DLM_LKF_VALBLK to decide if we care about the LVB in the LKB. If DLM_LKF_VALBLK is not set, fsdlm will skip recovering RSB's LVB from this lkb and set the right DLM_SBF_VALNOTVALID appropriately when node failure happens. The following diagram briefly illustrates how this crash happens: RSB1 is inode metadata lock resource with LOCK_TYPE_USES_LVB; The 1st round: Node1 Node2 RSB1: PR RSB1(master): NULL->EX ocfs2_downconvert_lock(PR->NULL, set_lvb==0) ocfs2_dlm_lock(no DLM_LKF_VALBLK) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - dlm_lock(no DLM_LKF_VALBLK) convert_lock(overwrite lkb->lkb_exflags with no DLM_LKF_VALBLK) RSB1: NULL RSB1: EX reset Node2 dlm_recover_rsbs() recover_lvb() /* The LVB is not trustable if the node with EX fails and * no lock >= PR is left. We should set RSB_VALNOTVALID for RSB1. */ if(!(kb_exflags & DLM_LKF_VALBLK)) /* This means we miss the chance to return; * to invalid the LVB here. */ The 2nd round: Node 1 Node2 RSB1(become master from recovery) ocfs2_setattr() ocfs2_inode_lock(NULL->EX) /* dlm_lock() return the stale lvb without setting DLM_SBF_VALNOTVALID */ ocfs2_meta_lvb_is_trustable() return 1 /* so we don't refresh inode from disk */ ocfs2_truncate_file() mlog_bug_on_msg(disk isize != i_size_read(inode)) /* crash! */ The fix is quite straightforward. We keep to set DLM_LKF_VALBLK flag for dlm_lock() if the lock resource type needs LVB and the fsdlm plugin is uesed. Link: http://lkml.kernel.org/r/1481275846-6604-1-git-send-email-zren@suse.com Signed-off-by: Eric Ren <zren@suse.com> Reviewed-by: Joseph Qi <jiangqi903@gmail.com> Cc: Mark Fasheh <mfasheh@versity.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
307 lines
9.3 KiB
C
307 lines
9.3 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* stackglue.h
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*
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* Glue to the underlying cluster stack.
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*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef STACKGLUE_H
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#define STACKGLUE_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/dlmconstants.h>
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#include "dlm/dlmapi.h"
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#include <linux/dlm.h>
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/* Needed for plock-related prototypes */
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struct file;
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struct file_lock;
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/*
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* dlmconstants.h does not have a LOCAL flag. We hope to remove it
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* some day, but right now we need it. Let's fake it. This value is larger
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* than any flag in dlmconstants.h.
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*/
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#define DLM_LKF_LOCAL 0x00100000
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/*
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* This shadows DLM_LOCKSPACE_LEN in fs/dlm/dlm_internal.h. That probably
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* wants to be in a public header.
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*/
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#define GROUP_NAME_MAX 64
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/* This shadows OCFS2_CLUSTER_NAME_LEN */
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#define CLUSTER_NAME_MAX 16
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/*
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* ocfs2_protocol_version changes when ocfs2 does something different in
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* its inter-node behavior. See dlmglue.c for more information.
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*/
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struct ocfs2_protocol_version {
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u8 pv_major;
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u8 pv_minor;
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};
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/*
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* The dlm_lockstatus struct includes lvb space, but the dlm_lksb struct only
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* has a pointer to separately allocated lvb space. This struct exists only to
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* include in the lksb union to make space for a combined dlm_lksb and lvb.
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*/
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struct fsdlm_lksb_plus_lvb {
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struct dlm_lksb lksb;
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char lvb[DLM_LVB_LEN];
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};
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/*
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* A union of all lock status structures. We define it here so that the
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* size of the union is known. Lock status structures are embedded in
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* ocfs2 inodes.
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*/
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struct ocfs2_cluster_connection;
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struct ocfs2_dlm_lksb {
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union {
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struct dlm_lockstatus lksb_o2dlm;
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struct dlm_lksb lksb_fsdlm;
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struct fsdlm_lksb_plus_lvb padding;
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};
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struct ocfs2_cluster_connection *lksb_conn;
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};
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/*
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* The ocfs2_locking_protocol defines the handlers called on ocfs2's behalf.
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*/
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struct ocfs2_locking_protocol {
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struct ocfs2_protocol_version lp_max_version;
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void (*lp_lock_ast)(struct ocfs2_dlm_lksb *lksb);
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void (*lp_blocking_ast)(struct ocfs2_dlm_lksb *lksb, int level);
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void (*lp_unlock_ast)(struct ocfs2_dlm_lksb *lksb, int error);
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};
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/*
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* A cluster connection. Mostly opaque to ocfs2, the connection holds
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* state for the underlying stack. ocfs2 does use cc_version to determine
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* locking compatibility.
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*/
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struct ocfs2_cluster_connection {
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char cc_name[GROUP_NAME_MAX + 1];
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int cc_namelen;
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char cc_cluster_name[CLUSTER_NAME_MAX + 1];
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int cc_cluster_name_len;
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struct ocfs2_protocol_version cc_version;
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struct ocfs2_locking_protocol *cc_proto;
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void (*cc_recovery_handler)(int node_num, void *recovery_data);
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void *cc_recovery_data;
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void *cc_lockspace;
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void *cc_private;
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};
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/*
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* Each cluster stack implements the stack operations structure. Not used
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* in the ocfs2 code, the stackglue code translates generic cluster calls
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* into stack operations.
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*/
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struct ocfs2_stack_operations {
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/*
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* The fs code calls ocfs2_cluster_connect() to attach a new
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* filesystem to the cluster stack. The ->connect() op is passed
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* an ocfs2_cluster_connection with the name and recovery field
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* filled in.
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*
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* The stack must set up any notification mechanisms and create
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* the filesystem lockspace in the DLM. The lockspace should be
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* stored on cc_lockspace. Any other information can be stored on
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* cc_private.
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*
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* ->connect() must not return until it is guaranteed that
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*
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* - Node down notifications for the filesystem will be received
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* and passed to conn->cc_recovery_handler().
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* - Locking requests for the filesystem will be processed.
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*/
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int (*connect)(struct ocfs2_cluster_connection *conn);
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/*
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* The fs code calls ocfs2_cluster_disconnect() when a filesystem
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* no longer needs cluster services. All DLM locks have been
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* dropped, and recovery notification is being ignored by the
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* fs code. The stack must disengage from the DLM and discontinue
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* recovery notification.
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*
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* Once ->disconnect() has returned, the connection structure will
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* be freed. Thus, a stack must not return from ->disconnect()
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* until it will no longer reference the conn pointer.
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*
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* Once this call returns, the stack glue will be dropping this
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* connection's reference on the module.
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*/
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int (*disconnect)(struct ocfs2_cluster_connection *conn);
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/*
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* ->this_node() returns the cluster's unique identifier for the
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* local node.
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*/
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int (*this_node)(struct ocfs2_cluster_connection *conn,
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unsigned int *node);
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/*
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* Call the underlying dlm lock function. The ->dlm_lock()
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* callback should convert the flags and mode as appropriate.
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*
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* ast and bast functions are not part of the call because the
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* stack will likely want to wrap ast and bast calls before passing
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* them to stack->sp_proto. There is no astarg. The lksb will
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* be passed back to the ast and bast functions. The caller can
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* use this to find their object.
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*/
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int (*dlm_lock)(struct ocfs2_cluster_connection *conn,
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int mode,
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struct ocfs2_dlm_lksb *lksb,
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u32 flags,
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void *name,
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unsigned int namelen);
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/*
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* Call the underlying dlm unlock function. The ->dlm_unlock()
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* function should convert the flags as appropriate.
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*
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* The unlock ast is not passed, as the stack will want to wrap
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* it before calling stack->sp_proto->lp_unlock_ast(). There is
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* no astarg. The lksb will be passed back to the unlock ast
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* function. The caller can use this to find their object.
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*/
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int (*dlm_unlock)(struct ocfs2_cluster_connection *conn,
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struct ocfs2_dlm_lksb *lksb,
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u32 flags);
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/*
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* Return the status of the current lock status block. The fs
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* code should never dereference the union. The ->lock_status()
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* callback pulls out the stack-specific lksb, converts the status
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* to a proper errno, and returns it.
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*/
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int (*lock_status)(struct ocfs2_dlm_lksb *lksb);
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/*
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* Return non-zero if the LVB is valid.
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*/
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int (*lvb_valid)(struct ocfs2_dlm_lksb *lksb);
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/*
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* Pull the lvb pointer off of the stack-specific lksb.
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*/
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void *(*lock_lvb)(struct ocfs2_dlm_lksb *lksb);
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/*
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* Cluster-aware posix locks
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*
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* This is NULL for stacks which do not support posix locks.
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*/
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int (*plock)(struct ocfs2_cluster_connection *conn,
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u64 ino,
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struct file *file,
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int cmd,
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struct file_lock *fl);
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/*
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* This is an optoinal debugging hook. If provided, the
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* stack can dump debugging information about this lock.
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*/
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void (*dump_lksb)(struct ocfs2_dlm_lksb *lksb);
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};
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/*
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* Each stack plugin must describe itself by registering a
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* ocfs2_stack_plugin structure. This is only seen by stackglue and the
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* stack driver.
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*/
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struct ocfs2_stack_plugin {
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char *sp_name;
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struct ocfs2_stack_operations *sp_ops;
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struct module *sp_owner;
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/* These are managed by the stackglue code. */
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struct list_head sp_list;
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unsigned int sp_count;
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struct ocfs2_protocol_version sp_max_proto;
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};
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/* Used by the filesystem */
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int ocfs2_cluster_connect(const char *stack_name,
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const char *cluster_name,
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int cluster_name_len,
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const char *group,
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int grouplen,
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struct ocfs2_locking_protocol *lproto,
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void (*recovery_handler)(int node_num,
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void *recovery_data),
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void *recovery_data,
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struct ocfs2_cluster_connection **conn);
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/*
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* Used by callers that don't store their stack name. They must ensure
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* all nodes have the same stack.
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*/
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int ocfs2_cluster_connect_agnostic(const char *group,
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int grouplen,
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struct ocfs2_locking_protocol *lproto,
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void (*recovery_handler)(int node_num,
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void *recovery_data),
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void *recovery_data,
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struct ocfs2_cluster_connection **conn);
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int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
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int hangup_pending);
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void ocfs2_cluster_hangup(const char *group, int grouplen);
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int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn,
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unsigned int *node);
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struct ocfs2_lock_res;
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int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
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int mode,
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struct ocfs2_dlm_lksb *lksb,
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u32 flags,
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void *name,
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unsigned int namelen);
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int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
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struct ocfs2_dlm_lksb *lksb,
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u32 flags);
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int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb);
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int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb);
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void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb);
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void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb);
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int ocfs2_stack_supports_plocks(void);
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int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
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struct file *file, int cmd, struct file_lock *fl);
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void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto);
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/* Used by stack plugins */
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int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin);
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void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin);
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/* In ocfs2_downconvert_lock(), we need to know which stack we are using */
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int ocfs2_is_o2cb_active(void);
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extern struct kset *ocfs2_kset;
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#endif /* STACKGLUE_H */
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