mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 01:46:40 +07:00
e7ee2c089e
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>
754 lines
18 KiB
C
754 lines
18 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.c
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*
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* Code which implements an OCFS2 specific interface to underlying
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* cluster stacks.
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*
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* Copyright (C) 2007, 2009 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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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/fs.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/sysctl.h>
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#include "ocfs2_fs.h"
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#include "stackglue.h"
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#define OCFS2_STACK_PLUGIN_O2CB "o2cb"
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#define OCFS2_STACK_PLUGIN_USER "user"
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#define OCFS2_MAX_HB_CTL_PATH 256
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static struct ocfs2_protocol_version locking_max_version;
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static DEFINE_SPINLOCK(ocfs2_stack_lock);
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static LIST_HEAD(ocfs2_stack_list);
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static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
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static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
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/*
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* The stack currently in use. If not null, active_stack->sp_count > 0,
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* the module is pinned, and the locking protocol cannot be changed.
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*/
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static struct ocfs2_stack_plugin *active_stack;
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inline int ocfs2_is_o2cb_active(void)
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{
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return !strcmp(active_stack->sp_name, OCFS2_STACK_PLUGIN_O2CB);
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}
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EXPORT_SYMBOL_GPL(ocfs2_is_o2cb_active);
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static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name)
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{
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struct ocfs2_stack_plugin *p;
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assert_spin_locked(&ocfs2_stack_lock);
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list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
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if (!strcmp(p->sp_name, name))
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return p;
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}
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return NULL;
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}
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static int ocfs2_stack_driver_request(const char *stack_name,
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const char *plugin_name)
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{
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int rc;
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struct ocfs2_stack_plugin *p;
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spin_lock(&ocfs2_stack_lock);
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/*
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* If the stack passed by the filesystem isn't the selected one,
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* we can't continue.
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*/
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if (strcmp(stack_name, cluster_stack_name)) {
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rc = -EBUSY;
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goto out;
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}
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if (active_stack) {
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/*
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* If the active stack isn't the one we want, it cannot
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* be selected right now.
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*/
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if (!strcmp(active_stack->sp_name, plugin_name))
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rc = 0;
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else
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rc = -EBUSY;
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goto out;
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}
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p = ocfs2_stack_lookup(plugin_name);
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if (!p || !try_module_get(p->sp_owner)) {
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rc = -ENOENT;
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goto out;
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}
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active_stack = p;
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rc = 0;
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out:
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/* If we found it, pin it */
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if (!rc)
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active_stack->sp_count++;
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spin_unlock(&ocfs2_stack_lock);
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return rc;
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}
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/*
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* This function looks up the appropriate stack and makes it active. If
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* there is no stack, it tries to load it. It will fail if the stack still
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* cannot be found. It will also fail if a different stack is in use.
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*/
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static int ocfs2_stack_driver_get(const char *stack_name)
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{
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int rc;
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char *plugin_name = OCFS2_STACK_PLUGIN_O2CB;
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/*
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* Classic stack does not pass in a stack name. This is
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* compatible with older tools as well.
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*/
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if (!stack_name || !*stack_name)
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stack_name = OCFS2_STACK_PLUGIN_O2CB;
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if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) {
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printk(KERN_ERR
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"ocfs2 passed an invalid cluster stack label: \"%s\"\n",
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stack_name);
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return -EINVAL;
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}
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/* Anything that isn't the classic stack is a user stack */
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if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB))
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plugin_name = OCFS2_STACK_PLUGIN_USER;
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rc = ocfs2_stack_driver_request(stack_name, plugin_name);
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if (rc == -ENOENT) {
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request_module("ocfs2_stack_%s", plugin_name);
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rc = ocfs2_stack_driver_request(stack_name, plugin_name);
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}
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if (rc == -ENOENT) {
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printk(KERN_ERR
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"ocfs2: Cluster stack driver \"%s\" cannot be found\n",
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plugin_name);
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} else if (rc == -EBUSY) {
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printk(KERN_ERR
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"ocfs2: A different cluster stack is in use\n");
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}
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return rc;
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}
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static void ocfs2_stack_driver_put(void)
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{
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spin_lock(&ocfs2_stack_lock);
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BUG_ON(active_stack == NULL);
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BUG_ON(active_stack->sp_count == 0);
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active_stack->sp_count--;
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if (!active_stack->sp_count) {
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module_put(active_stack->sp_owner);
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active_stack = NULL;
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}
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spin_unlock(&ocfs2_stack_lock);
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}
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int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin)
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{
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int rc;
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spin_lock(&ocfs2_stack_lock);
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if (!ocfs2_stack_lookup(plugin->sp_name)) {
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plugin->sp_count = 0;
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plugin->sp_max_proto = locking_max_version;
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list_add(&plugin->sp_list, &ocfs2_stack_list);
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printk(KERN_INFO "ocfs2: Registered cluster interface %s\n",
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plugin->sp_name);
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rc = 0;
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} else {
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printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n",
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plugin->sp_name);
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rc = -EEXIST;
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}
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spin_unlock(&ocfs2_stack_lock);
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return rc;
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}
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EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register);
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void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin)
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{
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struct ocfs2_stack_plugin *p;
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spin_lock(&ocfs2_stack_lock);
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p = ocfs2_stack_lookup(plugin->sp_name);
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if (p) {
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BUG_ON(p != plugin);
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BUG_ON(plugin == active_stack);
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BUG_ON(plugin->sp_count != 0);
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list_del_init(&plugin->sp_list);
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printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n",
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plugin->sp_name);
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} else {
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printk(KERN_ERR "Stack \"%s\" is not registered\n",
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plugin->sp_name);
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}
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spin_unlock(&ocfs2_stack_lock);
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}
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EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister);
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void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto)
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{
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struct ocfs2_stack_plugin *p;
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spin_lock(&ocfs2_stack_lock);
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if (memcmp(max_proto, &locking_max_version,
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sizeof(struct ocfs2_protocol_version))) {
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BUG_ON(locking_max_version.pv_major != 0);
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locking_max_version = *max_proto;
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list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
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p->sp_max_proto = locking_max_version;
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}
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}
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spin_unlock(&ocfs2_stack_lock);
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}
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EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version);
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/*
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* The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument
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* for the ast and bast functions. They will pass the lksb to the ast
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* and bast. The caller can wrap the lksb with their own structure to
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* get more information.
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*/
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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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{
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if (!lksb->lksb_conn)
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lksb->lksb_conn = conn;
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else
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BUG_ON(lksb->lksb_conn != conn);
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return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags,
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name, namelen);
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}
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lock);
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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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{
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BUG_ON(lksb->lksb_conn == NULL);
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return active_stack->sp_ops->dlm_unlock(conn, lksb, flags);
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}
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EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock);
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int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb)
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{
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return active_stack->sp_ops->lock_status(lksb);
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}
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status);
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int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb)
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{
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return active_stack->sp_ops->lvb_valid(lksb);
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}
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid);
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void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb)
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{
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return active_stack->sp_ops->lock_lvb(lksb);
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}
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb);
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void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb)
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{
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active_stack->sp_ops->dump_lksb(lksb);
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}
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EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
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int ocfs2_stack_supports_plocks(void)
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{
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return active_stack && active_stack->sp_ops->plock;
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}
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EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks);
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/*
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* ocfs2_plock() can only be safely called if
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* ocfs2_stack_supports_plocks() returned true
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*/
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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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{
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WARN_ON_ONCE(active_stack->sp_ops->plock == NULL);
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if (active_stack->sp_ops->plock)
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return active_stack->sp_ops->plock(conn, ino, file, cmd, fl);
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return -EOPNOTSUPP;
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}
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EXPORT_SYMBOL_GPL(ocfs2_plock);
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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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int rc = 0;
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struct ocfs2_cluster_connection *new_conn;
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BUG_ON(group == NULL);
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BUG_ON(conn == NULL);
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BUG_ON(recovery_handler == NULL);
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if (grouplen > GROUP_NAME_MAX) {
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rc = -EINVAL;
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goto out;
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}
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if (memcmp(&lproto->lp_max_version, &locking_max_version,
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sizeof(struct ocfs2_protocol_version))) {
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rc = -EINVAL;
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goto out;
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}
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new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection),
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GFP_KERNEL);
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if (!new_conn) {
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rc = -ENOMEM;
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goto out;
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}
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strlcpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1);
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new_conn->cc_namelen = grouplen;
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if (cluster_name_len)
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strlcpy(new_conn->cc_cluster_name, cluster_name,
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CLUSTER_NAME_MAX + 1);
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new_conn->cc_cluster_name_len = cluster_name_len;
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new_conn->cc_recovery_handler = recovery_handler;
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new_conn->cc_recovery_data = recovery_data;
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new_conn->cc_proto = lproto;
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/* Start the new connection at our maximum compatibility level */
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new_conn->cc_version = lproto->lp_max_version;
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/* This will pin the stack driver if successful */
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rc = ocfs2_stack_driver_get(stack_name);
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if (rc)
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goto out_free;
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rc = active_stack->sp_ops->connect(new_conn);
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if (rc) {
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ocfs2_stack_driver_put();
|
|
goto out_free;
|
|
}
|
|
|
|
*conn = new_conn;
|
|
|
|
out_free:
|
|
if (rc)
|
|
kfree(new_conn);
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_connect);
|
|
|
|
/* The caller will ensure all nodes have the same cluster stack */
|
|
int ocfs2_cluster_connect_agnostic(const char *group,
|
|
int grouplen,
|
|
struct ocfs2_locking_protocol *lproto,
|
|
void (*recovery_handler)(int node_num,
|
|
void *recovery_data),
|
|
void *recovery_data,
|
|
struct ocfs2_cluster_connection **conn)
|
|
{
|
|
char *stack_name = NULL;
|
|
|
|
if (cluster_stack_name[0])
|
|
stack_name = cluster_stack_name;
|
|
return ocfs2_cluster_connect(stack_name, NULL, 0, group, grouplen,
|
|
lproto, recovery_handler, recovery_data,
|
|
conn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic);
|
|
|
|
/* If hangup_pending is 0, the stack driver will be dropped */
|
|
int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
|
|
int hangup_pending)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(conn == NULL);
|
|
|
|
ret = active_stack->sp_ops->disconnect(conn);
|
|
|
|
/* XXX Should we free it anyway? */
|
|
if (!ret) {
|
|
kfree(conn);
|
|
if (!hangup_pending)
|
|
ocfs2_stack_driver_put();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect);
|
|
|
|
/*
|
|
* Leave the group for this filesystem. This is executed by a userspace
|
|
* program (stored in ocfs2_hb_ctl_path).
|
|
*/
|
|
static void ocfs2_leave_group(const char *group)
|
|
{
|
|
int ret;
|
|
char *argv[5], *envp[3];
|
|
|
|
argv[0] = ocfs2_hb_ctl_path;
|
|
argv[1] = "-K";
|
|
argv[2] = "-u";
|
|
argv[3] = (char *)group;
|
|
argv[4] = NULL;
|
|
|
|
/* minimal command environment taken from cpu_run_sbin_hotplug */
|
|
envp[0] = "HOME=/";
|
|
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
|
|
envp[2] = NULL;
|
|
|
|
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR
|
|
"ocfs2: Error %d running user helper "
|
|
"\"%s %s %s %s\"\n",
|
|
ret, argv[0], argv[1], argv[2], argv[3]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Hangup is a required post-umount. ocfs2-tools software expects the
|
|
* filesystem to call "ocfs2_hb_ctl" during unmount. This happens
|
|
* regardless of whether the DLM got started, so we can't do it
|
|
* in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does
|
|
* the actual work.
|
|
*/
|
|
void ocfs2_cluster_hangup(const char *group, int grouplen)
|
|
{
|
|
BUG_ON(group == NULL);
|
|
BUG_ON(group[grouplen] != '\0');
|
|
|
|
ocfs2_leave_group(group);
|
|
|
|
/* cluster_disconnect() was called with hangup_pending==1 */
|
|
ocfs2_stack_driver_put();
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup);
|
|
|
|
int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn,
|
|
unsigned int *node)
|
|
{
|
|
return active_stack->sp_ops->this_node(conn, node);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node);
|
|
|
|
|
|
/*
|
|
* Sysfs bits
|
|
*/
|
|
|
|
static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret = 0;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (locking_max_version.pv_major)
|
|
ret = snprintf(buf, PAGE_SIZE, "%u.%u\n",
|
|
locking_max_version.pv_major,
|
|
locking_max_version.pv_minor);
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_max_locking_protocol =
|
|
__ATTR(max_locking_protocol, S_IRUGO,
|
|
ocfs2_max_locking_protocol_show, NULL);
|
|
|
|
static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
|
|
struct ocfs2_stack_plugin *p;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
|
|
ret = snprintf(buf, remain, "%s\n",
|
|
p->sp_name);
|
|
if (ret < 0) {
|
|
total = ret;
|
|
break;
|
|
}
|
|
if (ret == remain) {
|
|
/* snprintf() didn't fit */
|
|
total = -E2BIG;
|
|
break;
|
|
}
|
|
total += ret;
|
|
remain -= ret;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return total;
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins =
|
|
__ATTR(loaded_cluster_plugins, S_IRUGO,
|
|
ocfs2_loaded_cluster_plugins_show, NULL);
|
|
|
|
static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret = 0;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (active_stack) {
|
|
ret = snprintf(buf, PAGE_SIZE, "%s\n",
|
|
active_stack->sp_name);
|
|
if (ret == PAGE_SIZE)
|
|
ret = -E2BIG;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_active_cluster_plugin =
|
|
__ATTR(active_cluster_plugin, S_IRUGO,
|
|
ocfs2_active_cluster_plugin_show, NULL);
|
|
|
|
static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret;
|
|
spin_lock(&ocfs2_stack_lock);
|
|
ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name);
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
size_t len = count;
|
|
ssize_t ret;
|
|
|
|
if (len == 0)
|
|
return len;
|
|
|
|
if (buf[len - 1] == '\n')
|
|
len--;
|
|
|
|
if ((len != OCFS2_STACK_LABEL_LEN) ||
|
|
(strnlen(buf, len) != len))
|
|
return -EINVAL;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (active_stack) {
|
|
if (!strncmp(buf, cluster_stack_name, len))
|
|
ret = count;
|
|
else
|
|
ret = -EBUSY;
|
|
} else {
|
|
memcpy(cluster_stack_name, buf, len);
|
|
ret = count;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static struct kobj_attribute ocfs2_attr_cluster_stack =
|
|
__ATTR(cluster_stack, S_IRUGO | S_IWUSR,
|
|
ocfs2_cluster_stack_show,
|
|
ocfs2_cluster_stack_store);
|
|
|
|
|
|
|
|
static ssize_t ocfs2_dlm_recover_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "1\n");
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_dlm_recover_support =
|
|
__ATTR(dlm_recover_callback_support, S_IRUGO,
|
|
ocfs2_dlm_recover_show, NULL);
|
|
|
|
static struct attribute *ocfs2_attrs[] = {
|
|
&ocfs2_attr_max_locking_protocol.attr,
|
|
&ocfs2_attr_loaded_cluster_plugins.attr,
|
|
&ocfs2_attr_active_cluster_plugin.attr,
|
|
&ocfs2_attr_cluster_stack.attr,
|
|
&ocfs2_attr_dlm_recover_support.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ocfs2_attr_group = {
|
|
.attrs = ocfs2_attrs,
|
|
};
|
|
|
|
struct kset *ocfs2_kset;
|
|
EXPORT_SYMBOL_GPL(ocfs2_kset);
|
|
|
|
static void ocfs2_sysfs_exit(void)
|
|
{
|
|
kset_unregister(ocfs2_kset);
|
|
}
|
|
|
|
static int ocfs2_sysfs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj);
|
|
if (!ocfs2_kset)
|
|
return -ENOMEM;
|
|
|
|
ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group);
|
|
if (ret)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
kset_unregister(ocfs2_kset);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sysctl bits
|
|
*
|
|
* The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't
|
|
* make as much sense in a multiple cluster stack world, but it's safer
|
|
* and easier to preserve the name.
|
|
*/
|
|
|
|
#define FS_OCFS2_NM 1
|
|
|
|
static struct ctl_table ocfs2_nm_table[] = {
|
|
{
|
|
.procname = "hb_ctl_path",
|
|
.data = ocfs2_hb_ctl_path,
|
|
.maxlen = OCFS2_MAX_HB_CTL_PATH,
|
|
.mode = 0644,
|
|
.proc_handler = proc_dostring,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ocfs2_mod_table[] = {
|
|
{
|
|
.procname = "nm",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ocfs2_nm_table
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ocfs2_kern_table[] = {
|
|
{
|
|
.procname = "ocfs2",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ocfs2_mod_table
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ocfs2_root_table[] = {
|
|
{
|
|
.procname = "fs",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ocfs2_kern_table
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table_header *ocfs2_table_header;
|
|
|
|
|
|
/*
|
|
* Initialization
|
|
*/
|
|
|
|
static int __init ocfs2_stack_glue_init(void)
|
|
{
|
|
strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);
|
|
|
|
ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
|
|
if (!ocfs2_table_header) {
|
|
printk(KERN_ERR
|
|
"ocfs2 stack glue: unable to register sysctl\n");
|
|
return -ENOMEM; /* or something. */
|
|
}
|
|
|
|
return ocfs2_sysfs_init();
|
|
}
|
|
|
|
static void __exit ocfs2_stack_glue_exit(void)
|
|
{
|
|
memset(&locking_max_version, 0,
|
|
sizeof(struct ocfs2_protocol_version));
|
|
ocfs2_sysfs_exit();
|
|
if (ocfs2_table_header)
|
|
unregister_sysctl_table(ocfs2_table_header);
|
|
}
|
|
|
|
MODULE_AUTHOR("Oracle");
|
|
MODULE_DESCRIPTION("ocfs2 cluter stack glue layer");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(ocfs2_stack_glue_init);
|
|
module_exit(ocfs2_stack_glue_exit);
|