cregit-Linux how code gets into the kernel

Release 4.10 fs/ocfs2/super.c

Directory: fs/ocfs2
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * super.c
 *
 * load/unload driver, mount/dismount volumes
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/statfs.h>
#include <linux/moduleparam.h>
#include <linux/blkdev.h>
#include <linux/socket.h>
#include <linux/inet.h>
#include <linux/parser.h>
#include <linux/crc32.h>
#include <linux/debugfs.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/quotaops.h>
#include <linux/cleancache.h>


#define CREATE_TRACE_POINTS
#include "ocfs2_trace.h"

#include <cluster/masklog.h>

#include "ocfs2.h"

/* this should be the only file to include a version 1 header */
#include "ocfs1_fs_compat.h"

#include "alloc.h"
#include "aops.h"
#include "blockcheck.h"
#include "dlmglue.h"
#include "export.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "localalloc.h"
#include "namei.h"
#include "slot_map.h"
#include "super.h"
#include "sysfile.h"
#include "uptodate.h"
#include "xattr.h"
#include "quota.h"
#include "refcounttree.h"
#include "suballoc.h"

#include "buffer_head_io.h"
#include "filecheck.h"


static struct kmem_cache *ocfs2_inode_cachep;

struct kmem_cache *ocfs2_dquot_cachep;

struct kmem_cache *ocfs2_qf_chunk_cachep;


static struct dentry *ocfs2_debugfs_root;

MODULE_AUTHOR("Oracle");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("OCFS2 cluster file system");


struct mount_options
{
	
unsigned long	commit_interval;
	
unsigned long	mount_opt;
	
unsigned int	atime_quantum;
	
signed short	slot;
	
int		localalloc_opt;
	
unsigned int	resv_level;
	
int		dir_resv_level;
	
char		cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
};

static int ocfs2_parse_options(struct super_block *sb, char *options,
			       struct mount_options *mopt,
			       int is_remount);
static int ocfs2_check_set_options(struct super_block *sb,
				   struct mount_options *options);
static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
static void ocfs2_put_super(struct super_block *sb);
static int ocfs2_mount_volume(struct super_block *sb);
static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
static int ocfs2_initialize_mem_caches(void);
static void ocfs2_free_mem_caches(void);
static void ocfs2_delete_osb(struct ocfs2_super *osb);

static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);

static int ocfs2_sync_fs(struct super_block *sb, int wait);

static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
static int ocfs2_check_volume(struct ocfs2_super *osb);
static int ocfs2_verify_volume(struct ocfs2_dinode *di,
			       struct buffer_head *bh,
			       u32 sectsize,
			       struct ocfs2_blockcheck_stats *stats);
static int ocfs2_initialize_super(struct super_block *sb,
				  struct buffer_head *bh,
				  int sector_size,
				  struct ocfs2_blockcheck_stats *stats);
static int ocfs2_get_sector(struct super_block *sb,
			    struct buffer_head **bh,
			    int block,
			    int sect_size);
static struct inode *ocfs2_alloc_inode(struct super_block *sb);
static void ocfs2_destroy_inode(struct inode *inode);
static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
static int ocfs2_enable_quotas(struct ocfs2_super *osb);
static void ocfs2_disable_quotas(struct ocfs2_super *osb);




static struct dquot **ocfs2_get_dquots(struct inode *inode)
{
	return OCFS2_I(inode)->i_dquot;
}


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static const struct super_operations ocfs2_sops = {
	.statfs		= ocfs2_statfs,
	.alloc_inode	= ocfs2_alloc_inode,
	.destroy_inode	= ocfs2_destroy_inode,
	.drop_inode	= ocfs2_drop_inode,
	.evict_inode	= ocfs2_evict_inode,
	.sync_fs	= ocfs2_sync_fs,
	.put_super	= ocfs2_put_super,
	.remount_fs	= ocfs2_remount,
	.show_options   = ocfs2_show_options,
	.quota_read	= ocfs2_quota_read,
	.quota_write	= ocfs2_quota_write,
	.get_dquots	= ocfs2_get_dquots,
};

enum {
	
Opt_barrier,
	
Opt_err_panic,
	
Opt_err_ro,
	
Opt_intr,
	
Opt_nointr,
	
Opt_hb_none,
	
Opt_hb_local,
	
Opt_hb_global,
	
Opt_data_ordered,
	
Opt_data_writeback,
	
Opt_atime_quantum,
	
Opt_slot,
	
Opt_commit,
	
Opt_localalloc,
	
Opt_localflocks,
	
Opt_stack,
	
Opt_user_xattr,
	
Opt_nouser_xattr,
	
Opt_inode64,
	
Opt_acl,
	
Opt_noacl,
	
Opt_usrquota,
	
Opt_grpquota,
	
Opt_coherency_buffered,
	
Opt_coherency_full,
	
Opt_resv_level,
	
Opt_dir_resv_level,
	
Opt_journal_async_commit,
	
Opt_err_cont,
	
Opt_err,
};


static const match_table_t tokens = {
	{Opt_barrier, "barrier=%u"},
	{Opt_err_panic, "errors=panic"},
	{Opt_err_ro, "errors=remount-ro"},
	{Opt_intr, "intr"},
	{Opt_nointr, "nointr"},
	{Opt_hb_none, OCFS2_HB_NONE},
	{Opt_hb_local, OCFS2_HB_LOCAL},
	{Opt_hb_global, OCFS2_HB_GLOBAL},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
	{Opt_atime_quantum, "atime_quantum=%u"},
	{Opt_slot, "preferred_slot=%u"},
	{Opt_commit, "commit=%u"},
	{Opt_localalloc, "localalloc=%d"},
	{Opt_localflocks, "localflocks"},
	{Opt_stack, "cluster_stack=%s"},
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_inode64, "inode64"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
	{Opt_usrquota, "usrquota"},
	{Opt_grpquota, "grpquota"},
	{Opt_coherency_buffered, "coherency=buffered"},
	{Opt_coherency_full, "coherency=full"},
	{Opt_resv_level, "resv_level=%u"},
	{Opt_dir_resv_level, "dir_resv_level=%u"},
	{Opt_journal_async_commit, "journal_async_commit"},
	{Opt_err_cont, "errors=continue"},
	{Opt_err, NULL}
};

#ifdef CONFIG_DEBUG_FS



static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
{
	struct ocfs2_cluster_connection *cconn = osb->cconn;
	struct ocfs2_recovery_map *rm = osb->recovery_map;
	struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
	int i, out = 0;
	unsigned long flags;

	out += snprintf(buf + out, len - out,
			"%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
			"Device", osb->dev_str, osb->uuid_str,
			osb->fs_generation, osb->vol_label);

	out += snprintf(buf + out, len - out,
			"%10s => State: %d  Flags: 0x%lX\n", "Volume",
			atomic_read(&osb->vol_state), osb->osb_flags);

	out += snprintf(buf + out, len - out,
			"%10s => Block: %lu  Cluster: %d\n", "Sizes",
			osb->sb->s_blocksize, osb->s_clustersize);

	out += snprintf(buf + out, len - out,
			"%10s => Compat: 0x%X  Incompat: 0x%X  "
			"ROcompat: 0x%X\n",
			"Features", osb->s_feature_compat,
			osb->s_feature_incompat, osb->s_feature_ro_compat);

	out += snprintf(buf + out, len - out,
			"%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
			osb->s_mount_opt, osb->s_atime_quantum);

	if (cconn) {
		out += snprintf(buf + out, len - out,
				"%10s => Stack: %s  Name: %*s  "
				"Version: %d.%d\n", "Cluster",
				(*osb->osb_cluster_stack == '\0' ?
				 "o2cb" : osb->osb_cluster_stack),
				cconn->cc_namelen, cconn->cc_name,
				cconn->cc_version.pv_major,
				cconn->cc_version.pv_minor);
	}

	spin_lock_irqsave(&osb->dc_task_lock, flags);
	out += snprintf(buf + out, len - out,
			"%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
			"WorkSeq: %lu\n", "DownCnvt",
			(osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
			osb->blocked_lock_count, osb->dc_wake_sequence,
			osb->dc_work_sequence);
	spin_unlock_irqrestore(&osb->dc_task_lock, flags);

	spin_lock(&osb->osb_lock);
	out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
			"Recovery",
			(osb->recovery_thread_task ?
			 task_pid_nr(osb->recovery_thread_task) : -1));
	if (rm->rm_used == 0)
		out += snprintf(buf + out, len - out, " None\n");
	else {
		for (i = 0; i < rm->rm_used; i++)
			out += snprintf(buf + out, len - out, " %d",
					rm->rm_entries[i]);
		out += snprintf(buf + out, len - out, "\n");
	}
	spin_unlock(&osb->osb_lock);

	out += snprintf(buf + out, len - out,
			"%10s => Pid: %d  Interval: %lu\n", "Commit",
			(osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
			osb->osb_commit_interval);

	out += snprintf(buf + out, len - out,
			"%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
			"Journal", osb->journal->j_state,
			osb->journal->j_trans_id,
			atomic_read(&osb->journal->j_num_trans));

	out += snprintf(buf + out, len - out,
			"%10s => GlobalAllocs: %d  LocalAllocs: %d  "
			"SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
			"Stats",
			atomic_read(&osb->alloc_stats.bitmap_data),
			atomic_read(&osb->alloc_stats.local_data),
			atomic_read(&osb->alloc_stats.bg_allocs),
			atomic_read(&osb->alloc_stats.moves),
			atomic_read(&osb->alloc_stats.bg_extends));

	out += snprintf(buf + out, len - out,
			"%10s => State: %u  Descriptor: %llu  Size: %u bits  "
			"Default: %u bits\n",
			"LocalAlloc", osb->local_alloc_state,
			(unsigned long long)osb->la_last_gd,
			osb->local_alloc_bits, osb->local_alloc_default_bits);

	spin_lock(&osb->osb_lock);
	out += snprintf(buf + out, len - out,
			"%10s => InodeSlot: %d  StolenInodes: %d, "
			"MetaSlot: %d  StolenMeta: %d\n", "Steal",
			osb->s_inode_steal_slot,
			atomic_read(&osb->s_num_inodes_stolen),
			osb->s_meta_steal_slot,
			atomic_read(&osb->s_num_meta_stolen));
	spin_unlock(&osb->osb_lock);

	out += snprintf(buf + out, len - out, "OrphanScan => ");
	out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
			os->os_count, os->os_seqno);
	out += snprintf(buf + out, len - out, " Last Scan: ");
	if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
		out += snprintf(buf + out, len - out, "Disabled\n");
	else
		out += snprintf(buf + out, len - out, "%lu seconds ago\n",
				(unsigned long)(ktime_get_seconds() - os->os_scantime));

	out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
			"Slots", "Num", "RecoGen");
	for (i = 0; i < osb->max_slots; ++i) {
		out += snprintf(buf + out, len - out,
				"%10s  %c %3d  %10d\n",
				" ",
				(i == osb->slot_num ? '*' : ' '),
				i, osb->slot_recovery_generations[i]);
	}

	return out;
}


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yiwen jiangyiwen jiang101.13%112.50%


deepa dinamanideepa dinamani70.79%112.50%


goldwyn rodriguesgoldwyn rodrigues10.11%112.50%


Total882100.00%8100.00%






static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
{
	struct ocfs2_super *osb = inode->i_private;
	char *buf = NULL;

	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!buf)
		goto bail;

	i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));

	file->private_data = buf;

	return 0;
bail:
	return -ENOMEM;
}


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static int ocfs2_debug_release(struct inode *inode, struct file *file)
{
	kfree(file->private_data);
	return 0;
}


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static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
				size_t nbytes, loff_t *ppos)
{
	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
				       i_size_read(file->f_mapping->host));
}

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#else



static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
{
	return 0;
}

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static int ocfs2_debug_release(struct inode *inode, struct file *file)
{
	return 0;
}

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static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
				size_t nbytes, loff_t *ppos)
{
	return 0;
}

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#endif	/* CONFIG_DEBUG_FS */


static const struct file_operations ocfs2_osb_debug_fops = {
	.open =		ocfs2_osb_debug_open,
	.release =	ocfs2_debug_release,
	.read =		ocfs2_debug_read,
	.llseek =	generic_file_llseek,
};




static int ocfs2_sync_fs(struct super_block *sb, int wait)
{
	int status;
	tid_t target;
	struct ocfs2_super *osb = OCFS2_SB(sb);

	if (ocfs2_is_hard_readonly(osb))
		return -EROFS;

	if (wait) {
		status = ocfs2_flush_truncate_log(osb);
		if (status < 0)
			mlog_errno(status);
	} else {
		ocfs2_schedule_truncate_log_flush(osb, 0);
	}

	if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
				      &target)) {
		if (wait)
			jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
					     target);
	}
	return 0;
}


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static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
{
	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
	    && (ino == USER_QUOTA_SYSTEM_INODE
		|| ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
		return 0;
	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
	    && (ino == GROUP_QUOTA_SYSTEM_INODE
		|| ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
		return 0;
	return 1;
}


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static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
{
	struct inode *new = NULL;
	int status = 0;
	int i;

	new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
	if (IS_ERR(new)) {
		status = PTR_ERR(new);
		mlog_errno(status);
		goto bail;
	}
	osb->root_inode = new;

	new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
	if (IS_ERR(new)) {
		status = PTR_ERR(new);
		mlog_errno(status);
		goto bail;
	}
	osb->sys_root_inode = new;

	for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
	     i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
		if (!ocfs2_need_system_inode(osb, i))
			continue;
		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
		if (!new) {
			ocfs2_release_system_inodes(osb);
			status = -EINVAL;
			mlog_errno(status);
			/* FIXME: Should ERROR_RO_FS */
			mlog(ML_ERROR, "Unable to load system inode %d, "
			     "possibly corrupt fs?", i);
			goto bail;
		}
		// the array now has one ref, so drop this one
		iput(new);
	}

bail:
	if (status)
		mlog_errno(status);
	return status;
}


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static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
{
	struct inode *new = NULL;
	int status = 0;
	int i;

	for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
	     i < NUM_SYSTEM_INODES;
	     i++) {
		if (!ocfs2_need_system_inode(osb, i))
			continue;
		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
		if (!new) {
			ocfs2_release_system_inodes(osb);
			status = -EINVAL;
			mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
			     status, i, osb->slot_num);
			goto bail;
		}
		/* the array now has one ref, so drop this one */
		iput(new);
	}

bail:
	if (status)
		mlog_errno(status);
	return status;
}


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static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
{
	int i;
	struct inode *inode;

	for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
		inode = osb->global_system_inodes[i];
		if (inode) {
			iput(inode);
			osb->global_system_inodes[i] = NULL;
		}
	}

	inode = osb->sys_root_inode;
	if (inode) {
		iput(inode);
		osb->sys_root_inode = NULL;
	}

	inode = osb->root_inode;
	if (inode) {
		iput(inode);
		osb->root_inode = NULL;
	}

	if (!osb->local_system_inodes)
		return;

	for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
		if (osb->local_system_inodes[i]) {
			iput(osb->local_system_inodes[i]);
			osb->local_system_inodes[i] = NULL;
		}
	}

	kfree(osb->local_system_inodes);
	osb->local_system_inodes = NULL;
}


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Total179100.00%4100.00%



/* We're allocating fs objects, use GFP_NOFS */



static struct inode *ocfs2_alloc_inode(struct super_block *sb)
{
	struct ocfs2_inode_info *oi;

	oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
	if (!oi)
		return NULL;

	oi->i_sync_tid = 0;
	oi->i_datasync_tid = 0;
	memset(&oi->i_dquot, 0, sizeof(oi->i_dquot));

	jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
	return &oi->vfs_inode;
}


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darrick j. wongdarrick j. wong1214.46%120.00%


christoph lameterchristoph lameter11.20%120.00%


Total83100.00%5100.00%






static void ocfs2_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
}


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static void ocfs2_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, ocfs2_i_callback);
}


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static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
						unsigned int cbits)
{
	unsigned int bytes = 1 << cbits;
	unsigned int trim = bytes;
	unsigned int bitshift = 32;

	/*
         * i_size and all block offsets in ocfs2 are always 64 bits
         * wide. i_clusters is 32 bits, in cluster-sized units. So on
         * 64 bit platforms, cluster size will be the limiting factor.
         */

#if BITS_PER_LONG == 32
# if defined(CONFIG_LBDAF)
	BUILD_BUG_ON(sizeof(sector_t) != 8)