text: /*
   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   * Copyright (C) 2004-2006 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 version 2.
   */
  
  #include <linux/spinlock.h>
  #include <linux/completion.h>
  #include <linux/buffer_head.h>
  #include <linux/crc32.h>
  #include <linux/gfs2_ondisk.h>
  #include <asm/uaccess.h>
  
  #include "gfs2.h"
  #include "incore.h"
  #include "glock.h"
  #include "util.h"
  
  struct kmem_cache *gfs2_glock_cachep __read_mostly;
  struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
  struct kmem_cache *gfs2_inode_cachep __read_mostly;
  struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
  struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
  struct kmem_cache *gfs2_quotad_cachep __read_mostly;
  struct kmem_cache *gfs2_rsrv_cachep __read_mostly;
  mempool_t *gfs2_page_pool __read_mostly;
  
  void gfs2_assert_i(struct gfs2_sbd *sdp)
  {
  	printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
  	       sdp->sd_fsname);
  }
  
  int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
  {
  	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
  	const struct lm_lockops *lm = ls->ls_ops;
  	va_list args;
  
  	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
  	    test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
  		return 0;
  
  	va_start(args, fmt);
  	vprintk(fmt, args);
  	va_end(args);
  
  	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
  		fs_err(sdp, "about to withdraw this file system\n");
  		BUG_ON(sdp->sd_args.ar_debug);
  
  		kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
  
  		if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
  			wait_for_completion(&sdp->sd_wdack);
  
  		if (lm->lm_unmount) {
  			fs_err(sdp, "telling LM to unmount\n");
  			lm->lm_unmount(sdp);
  		}
  		fs_err(sdp, "withdrawn\n");
  		dump_stack();
  	}
  
  	if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
  		panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);
  
  	return -1;
  }
  
  /**
   * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
   * Returns: -1 if this call withdrew the machine,
   *          -2 if it was already withdrawn
   */
  
  int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
  			   const char *function, char *file, unsigned int line)
  {
  	int me;
  	me = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname, assertion,
  		sdp->sd_fsname, function, file, line);
  	dump_stack();
  	return (me) ? -1 : -2;
  }
  
  /**
   * gfs2_assert_warn_i - Print a message to the console if @assertion is false
   * Returns: -1 if we printed something
   *          -2 if we didn't
   */
  
  int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
  		       const char *function, char *file, unsigned int line)
  {
  	if (time_before(jiffies,
  			sdp->sd_last_warning +
  			gfs2_tune_get(sdp, gt_complain_secs) * HZ))
  		return -2;
  
  	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
  		printk(KERN_WARNING
  		       "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
  		       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		       sdp->sd_fsname, assertion,
  		       sdp->sd_fsname, function, file, line);
  
  	if (sdp->sd_args.ar_debug)
  		BUG();
  	else
  		dump_stack();
  
  	if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
  		panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
  		      "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		      sdp->sd_fsname, assertion,
  		      sdp->sd_fsname, function, file, line);
  
  	sdp->sd_last_warning = jiffies;
  
  	return -1;
  }
  
  /**
   * gfs2_consist_i - Flag a filesystem consistency error and withdraw
   * Returns: -1 if this call withdrew the machine,
   *          0 if it was already withdrawn
   */
  
  int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
  		   char *file, unsigned int line)
  {
  	int rv;
  	rv = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname,
  		sdp->sd_fsname, function, file, line);
  	return rv;
  }
  
  /**
   * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
   * Returns: -1 if this call withdrew the machine,
   *          0 if it was already withdrawn
   */
  
  int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
  			 const char *function, char *file, unsigned int line)
  {
  	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  	int rv;
  	rv = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
  		"GFS2: fsid=%s:   inode = %llu %llu\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname,
  		sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
  		(unsigned long long)ip->i_no_addr,
  		sdp->sd_fsname, function, file, line);
  	return rv;
  }
  
  /**
   * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
   * Returns: -1 if this call withdrew the machine,
   *          0 if it was already withdrawn
   */
  
  int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
  			 const char *function, char *file, unsigned int line)
  {
  	struct gfs2_sbd *sdp = rgd->rd_sbd;
  	int rv;
  	rv = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
  		"GFS2: fsid=%s:   RG = %llu\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname,
  		sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
  		sdp->sd_fsname, function, file, line);
  	return rv;
  }
  
  /**
   * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
   * Returns: -1 if this call withdrew the machine,
   *          -2 if it was already withdrawn
   */
  
  int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
  		       const char *type, const char *function, char *file,
  		       unsigned int line)
  {
  	int me;
  	me = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: invalid metadata block\n"
  		"GFS2: fsid=%s:   bh = %llu (%s)\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname,
  		sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
  		sdp->sd_fsname, function, file, line);
  	return (me) ? -1 : -2;
  }
  
  /**
   * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
   * Returns: -1 if this call withdrew the machine,
   *          -2 if it was already withdrawn
   */
  
  int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
  			   u16 type, u16 t, const char *function,
  			   char *file, unsigned int line)
  {
  	int me;
  	me = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: invalid metadata block\n"
  		"GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname,
  		sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
  		sdp->sd_fsname, function, file, line);
  	return (me) ? -1 : -2;
  }
  
  /**
   * gfs2_io_error_i - Flag an I/O error and withdraw
   * Returns: -1 if this call withdrew the machine,
   *          0 if it was already withdrawn
   */
  
  int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
  		    unsigned int line)
  {
  	int rv;
  	rv = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: I/O error\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname,
  		sdp->sd_fsname, function, file, line);
  	return rv;
  }
  
  /**
   * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
   * Returns: -1 if this call withdrew the machine,
   *          0 if it was already withdrawn
   */
  
  int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
  		       const char *function, char *file, unsigned int line)
  {
  	int rv;
  	rv = gfs2_lm_withdraw(sdp,
  		"GFS2: fsid=%s: fatal: I/O error\n"
  		"GFS2: fsid=%s:   block = %llu\n"
  		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  		sdp->sd_fsname,
  		sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
  		sdp->sd_fsname, function, file, line);
  	return rv;
  }
  
  void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
  		      unsigned int bit, int new_value)
  {
  	unsigned int c, o, b = bit;
  	int old_value;
  
  	c = b / (8 * PAGE_SIZE);
  	b %= 8 * PAGE_SIZE;
  	o = b / 8;
  	b %= 8;
  
  	old_value = (bitmap[c][o] & (1 << b));
  	gfs2_assert_withdraw(sdp, !old_value != !new_value);
  
  	if (new_value)
  		bitmap[c][o] |= 1 << b;
  	else
  		bitmap[c][o] &= ~(1 << b);
  }
  
  