cregit-Linux how code gets into the kernel

Release 4.10 fs/dlm/recoverd.c

Directory: fs/dlm
/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
**  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
**
**  This copyrighted material is made available to anyone wishing to use,
**  modify, copy, or redistribute it subject to the terms and conditions
**  of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/

#include "dlm_internal.h"
#include "lockspace.h"
#include "member.h"
#include "dir.h"
#include "ast.h"
#include "recover.h"
#include "lowcomms.h"
#include "lock.h"
#include "requestqueue.h"
#include "recoverd.h"


/* If the start for which we're re-enabling locking (seq) has been superseded
   by a newer stop (ls_recover_seq), we need to leave locking disabled.

   We suspend dlm_recv threads here to avoid the race where dlm_recv a) sees
   locking stopped and b) adds a message to the requestqueue, but dlm_recoverd
   enables locking and clears the requestqueue between a and b. */


static int enable_locking(struct dlm_ls *ls, uint64_t seq) { int error = -EINTR; down_write(&ls->ls_recv_active); spin_lock(&ls->ls_recover_lock); if (ls->ls_recover_seq == seq) { set_bit(LSFL_RUNNING, &ls->ls_flags); /* unblocks processes waiting to enter the dlm */ up_write(&ls->ls_in_recovery); clear_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); error = 0; } spin_unlock(&ls->ls_recover_lock); up_write(&ls->ls_recv_active); return error; }

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david teiglanddavid teigland98100.00%3100.00%
Total98100.00%3100.00%


static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) { unsigned long start; int error, neg = 0; log_rinfo(ls, "dlm_recover %llu", (unsigned long long)rv->seq); mutex_lock(&ls->ls_recoverd_active); dlm_callback_suspend(ls); dlm_clear_toss(ls); /* * This list of root rsb's will be the basis of most of the recovery * routines. */ dlm_create_root_list(ls); /* * Add or remove nodes from the lockspace's ls_nodes list. */ error = dlm_recover_members(ls, rv, &neg); if (error) { log_rinfo(ls, "dlm_recover_members error %d", error); goto fail; } dlm_recover_dir_nodeid(ls); ls->ls_recover_dir_sent_res = 0; ls->ls_recover_dir_sent_msg = 0; ls->ls_recover_locks_in = 0; dlm_set_recover_status(ls, DLM_RS_NODES); error = dlm_recover_members_wait(ls); if (error) { log_rinfo(ls, "dlm_recover_members_wait error %d", error); goto fail; } start = jiffies; /* * Rebuild our own share of the directory by collecting from all other * nodes their master rsb names that hash to us. */ error = dlm_recover_directory(ls); if (error) { log_rinfo(ls, "dlm_recover_directory error %d", error); goto fail; } dlm_set_recover_status(ls, DLM_RS_DIR); error = dlm_recover_directory_wait(ls); if (error) { log_rinfo(ls, "dlm_recover_directory_wait error %d", error); goto fail; } log_rinfo(ls, "dlm_recover_directory %u out %u messages", ls->ls_recover_dir_sent_res, ls->ls_recover_dir_sent_msg); /* * We may have outstanding operations that are waiting for a reply from * a failed node. Mark these to be resent after recovery. Unlock and * cancel ops can just be completed. */ dlm_recover_waiters_pre(ls); error = dlm_recovery_stopped(ls); if (error) goto fail; if (neg || dlm_no_directory(ls)) { /* * Clear lkb's for departed nodes. */ dlm_recover_purge(ls); /* * Get new master nodeid's for rsb's that were mastered on * departed nodes. */ error = dlm_recover_masters(ls); if (error) { log_rinfo(ls, "dlm_recover_masters error %d", error); goto fail; } /* * Send our locks on remastered rsb's to the new masters. */ error = dlm_recover_locks(ls); if (error) { log_rinfo(ls, "dlm_recover_locks error %d", error); goto fail; } dlm_set_recover_status(ls, DLM_RS_LOCKS); error = dlm_recover_locks_wait(ls); if (error) { log_rinfo(ls, "dlm_recover_locks_wait error %d", error); goto fail; } log_rinfo(ls, "dlm_recover_locks %u in", ls->ls_recover_locks_in); /* * Finalize state in master rsb's now that all locks can be * checked. This includes conversion resolution and lvb * settings. */ dlm_recover_rsbs(ls); } else { /* * Other lockspace members may be going through the "neg" steps * while also adding us to the lockspace, in which case they'll * be doing the recover_locks (RS_LOCKS) barrier. */ dlm_set_recover_status(ls, DLM_RS_LOCKS); error = dlm_recover_locks_wait(ls); if (error) { log_rinfo(ls, "dlm_recover_locks_wait error %d", error); goto fail; } } dlm_release_root_list(ls); /* * Purge directory-related requests that are saved in requestqueue. * All dir requests from before recovery are invalid now due to the dir * rebuild and will be resent by the requesting nodes. */ dlm_purge_requestqueue(ls); dlm_set_recover_status(ls, DLM_RS_DONE); error = dlm_recover_done_wait(ls); if (error) { log_rinfo(ls, "dlm_recover_done_wait error %d", error); goto fail; } dlm_clear_members_gone(ls); dlm_adjust_timeouts(ls); dlm_callback_resume(ls); error = enable_locking(ls, rv->seq); if (error) { log_rinfo(ls, "enable_locking error %d", error); goto fail; } error = dlm_process_requestqueue(ls); if (error) { log_rinfo(ls, "dlm_process_requestqueue error %d", error); goto fail; } error = dlm_recover_waiters_post(ls); if (error) { log_rinfo(ls, "dlm_recover_waiters_post error %d", error); goto fail; } dlm_recover_grant(ls); log_rinfo(ls, "dlm_recover %llu generation %u done: %u ms", (unsigned long long)rv->seq, ls->ls_generation, jiffies_to_msecs(jiffies - start)); mutex_unlock(&ls->ls_recoverd_active); dlm_lsop_recover_done(ls); return 0; fail: dlm_release_root_list(ls); log_rinfo(ls, "dlm_recover %llu error %d", (unsigned long long)rv->seq, error); mutex_unlock(&ls->ls_recoverd_active); return error; }

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david teiglanddavid teigland61097.60%1493.33%
ryusuke konishiryusuke konishi152.40%16.67%
Total625100.00%15100.00%

/* The dlm_ls_start() that created the rv we take here may already have been stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP flag set. */
static void do_ls_recovery(struct dlm_ls *ls) { struct dlm_recover *rv = NULL; spin_lock(&ls->ls_recover_lock); rv = ls->ls_recover_args; ls->ls_recover_args = NULL; if (rv && ls->ls_recover_seq == rv->seq) clear_bit(LSFL_RECOVER_STOP, &ls->ls_flags); spin_unlock(&ls->ls_recover_lock); if (rv) { ls_recover(ls, rv); kfree(rv->nodes); kfree(rv); } }

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david teiglanddavid teigland93100.00%5100.00%
Total93100.00%5100.00%


static int dlm_recoverd(void *arg) { struct dlm_ls *ls; ls = dlm_find_lockspace_local(arg); if (!ls) { log_print("dlm_recoverd: no lockspace %p", arg); return -1; } down_write(&ls->ls_in_recovery); set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); wake_up(&ls->ls_recover_lock_wait); while (!kthread_should_stop()) { set_current_state(TASK_INTERRUPTIBLE); if (!test_bit(LSFL_RECOVER_WORK, &ls->ls_flags) && !test_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) schedule(); set_current_state(TASK_RUNNING); if (test_and_clear_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) { down_write(&ls->ls_in_recovery); set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); wake_up(&ls->ls_recover_lock_wait); } if (test_and_clear_bit(LSFL_RECOVER_WORK, &ls->ls_flags)) do_ls_recovery(ls); } if (test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags)) up_write(&ls->ls_in_recovery); dlm_put_lockspace(ls); return 0; }

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david teiglanddavid teigland196100.00%3100.00%
Total196100.00%3100.00%


int dlm_recoverd_start(struct dlm_ls *ls) { struct task_struct *p; int error = 0; p = kthread_run(dlm_recoverd, ls, "dlm_recoverd"); if (IS_ERR(p)) error = PTR_ERR(p); else ls->ls_recoverd_task = p; return error; }

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david teiglanddavid teigland55100.00%1100.00%
Total55100.00%1100.00%


void dlm_recoverd_stop(struct dlm_ls *ls) { kthread_stop(ls->ls_recoverd_task); }

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david teiglanddavid teigland17100.00%1100.00%
Total17100.00%1100.00%


void dlm_recoverd_suspend(struct dlm_ls *ls) { wake_up(&ls->ls_wait_general); mutex_lock(&ls->ls_recoverd_active); }

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david teiglanddavid teigland26100.00%3100.00%
Total26100.00%3100.00%


void dlm_recoverd_resume(struct dlm_ls *ls) { mutex_unlock(&ls->ls_recoverd_active); }

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david teiglanddavid teigland18100.00%2100.00%
Total18100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
david teiglanddavid teigland114698.71%2095.24%
ryusuke konishiryusuke konishi151.29%14.76%
Total1161100.00%21100.00%
Directory: fs/dlm
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