Eric Lee / smarc-fsl-linux-kernel

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fs/hpfs/buffer.c 3.74 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /*
   *  linux/fs/hpfs/buffer.c
   *
   *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   *
   *  general buffer i/o
   */
e8edc6e03   Alexey Dobriyan   Detach sched.h fr... 
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  #include <linux/sched.h>
5a0e3ad6a   Tejun Heo   include cleanup: ... 
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  #include <linux/slab.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #include "hpfs_fn.h"
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  /* Map a sector into a buffer and return pointers to it and to the buffer. */
  
  void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp,
  		 int ahead)
  {
  	struct buffer_head *bh;
7dd29d8d8   Mikulas Patocka   HPFS: Introduce a... 
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  	hpfs_lock_assert(s);
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  	cond_resched();
  
  	*bhp = bh = sb_bread(s, secno);
  	if (bh != NULL)
  		return bh->b_data;
  	else {
  		printk("HPFS: hpfs_map_sector: read error
  ");
  		return NULL;
  	}
  }
  
  /* Like hpfs_map_sector but don't read anything */
  
  void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp)
  {
  	struct buffer_head *bh;
  	/*return hpfs_map_sector(s, secno, bhp, 0);*/
7dd29d8d8   Mikulas Patocka   HPFS: Introduce a... 
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  	hpfs_lock_assert(s);
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  	cond_resched();
  
  	if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
  		if (!buffer_uptodate(bh)) wait_on_buffer(bh);
  		set_buffer_uptodate(bh);
  		return bh->b_data;
  	} else {
  		printk("HPFS: hpfs_get_sector: getblk failed
  ");
  		return NULL;
  	}
  }
  
  /* Map 4 sectors into a 4buffer and return pointers to it and to the buffer. */
  
  void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffer_head *qbh,
  		   int ahead)
  {
  	struct buffer_head *bh;
  	char *data;
7dd29d8d8   Mikulas Patocka   HPFS: Introduce a... 
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  	hpfs_lock_assert(s);
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  	cond_resched();
  
  	if (secno & 3) {
  		printk("HPFS: hpfs_map_4sectors: unaligned read
  ");
  		return NULL;
  	}
f52720ca5   Panagiotis Issaris   [PATCH] fs: Remov... 
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  	qbh->data = data = kmalloc(2048, GFP_NOFS);
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  	if (!data) {
  		printk("HPFS: hpfs_map_4sectors: out of memory
  ");
  		goto bail;
  	}
  
  	qbh->bh[0] = bh = sb_bread(s, secno);
  	if (!bh)
  		goto bail0;
  	memcpy(data, bh->b_data, 512);
  
  	qbh->bh[1] = bh = sb_bread(s, secno + 1);
  	if (!bh)
  		goto bail1;
  	memcpy(data + 512, bh->b_data, 512);
  
  	qbh->bh[2] = bh = sb_bread(s, secno + 2);
  	if (!bh)
  		goto bail2;
  	memcpy(data + 2 * 512, bh->b_data, 512);
  
  	qbh->bh[3] = bh = sb_bread(s, secno + 3);
  	if (!bh)
  		goto bail3;
  	memcpy(data + 3 * 512, bh->b_data, 512);
  
  	return data;
  
   bail3:
  	brelse(qbh->bh[2]);
   bail2:
  	brelse(qbh->bh[1]);
   bail1:
  	brelse(qbh->bh[0]);
   bail0:
  	kfree(data);
  	printk("HPFS: hpfs_map_4sectors: read error
  ");
   bail:
  	return NULL;
  }
  
  /* Don't read sectors */
  
  void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
                            struct quad_buffer_head *qbh)
  {
  	cond_resched();
7dd29d8d8   Mikulas Patocka   HPFS: Introduce a... 
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  	hpfs_lock_assert(s);
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  	if (secno & 3) {
  		printk("HPFS: hpfs_get_4sectors: unaligned read
  ");
  		return NULL;
  	}
  
  	/*return hpfs_map_4sectors(s, secno, qbh, 0);*/
  	if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
  		printk("HPFS: hpfs_get_4sectors: out of memory
  ");
  		return NULL;
  	}
  	if (!(hpfs_get_sector(s, secno, &qbh->bh[0]))) goto bail0;
  	if (!(hpfs_get_sector(s, secno + 1, &qbh->bh[1]))) goto bail1;
  	if (!(hpfs_get_sector(s, secno + 2, &qbh->bh[2]))) goto bail2;
  	if (!(hpfs_get_sector(s, secno + 3, &qbh->bh[3]))) goto bail3;
  	memcpy(qbh->data, qbh->bh[0]->b_data, 512);
  	memcpy(qbh->data + 512, qbh->bh[1]->b_data, 512);
  	memcpy(qbh->data + 2*512, qbh->bh[2]->b_data, 512);
  	memcpy(qbh->data + 3*512, qbh->bh[3]->b_data, 512);
  	return qbh->data;
  
  	bail3:	brelse(qbh->bh[2]);
  	bail2:	brelse(qbh->bh[1]);
  	bail1:	brelse(qbh->bh[0]);
  	bail0:
  	return NULL;
  }
  	
  
  void hpfs_brelse4(struct quad_buffer_head *qbh)
  {
  	brelse(qbh->bh[3]);
  	brelse(qbh->bh[2]);
  	brelse(qbh->bh[1]);
  	brelse(qbh->bh[0]);
  	kfree(qbh->data);
  }	
  
  void hpfs_mark_4buffers_dirty(struct quad_buffer_head *qbh)
  {
  	PRINTK(("hpfs_mark_4buffers_dirty
  "));
  	memcpy(qbh->bh[0]->b_data, qbh->data, 512);
  	memcpy(qbh->bh[1]->b_data, qbh->data + 512, 512);
  	memcpy(qbh->bh[2]->b_data, qbh->data + 2 * 512, 512);
  	memcpy(qbh->bh[3]->b_data, qbh->data + 3 * 512, 512);
  	mark_buffer_dirty(qbh->bh[0]);
  	mark_buffer_dirty(qbh->bh[1]);
  	mark_buffer_dirty(qbh->bh[2]);
  	mark_buffer_dirty(qbh->bh[3]);
  }