예제 #1
0
int hfsplus_journaled_get_block(struct page *page)
{
  struct inode * const inode = page->mapping->host;
  struct super_block * const sb = inode->i_sb;
  struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
  u32 ablock, res;
  sector_t iblock;
  s32 block_num = -1;
  
  iblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
  ablock = iblock >> HFSPLUS_SB(sb)->fs_shift;
  if (ablock < hip->first_blocks) {
    block_num = hfsplus_ext_find_block(hip->first_extents, ablock);
  }
  else {
    mutex_lock(&hip->extents_lock);
    res = hfsplus_ext_read_extent(inode, ablock);
    if (!res) {
      mutex_lock(&hip->extents_lock);
      block_num = hfsplus_ext_find_block(hip->cached_extents, ablock -
      hip->cached_start);
      mutex_unlock(&hip->extents_lock);
    } else {
      mutex_unlock(&hip->extents_lock);
    }
    mutex_unlock(&hip->extents_lock);
  }
  
  return block_num;
}
예제 #2
0
/* Get a block at iblock for inode, possibly allocating if create */
int hfsplus_get_block(struct inode *inode, sector_t iblock,
		      struct buffer_head *bh_result, int create)
{
	struct super_block *sb;
	int res = -EIO;
	u32 ablock, dblock, mask;
	int shift;

	sb = inode->i_sb;

	/* Convert inode block to disk allocation block */
	shift = HFSPLUS_SB(sb).alloc_blksz_shift - sb->s_blocksize_bits;
	ablock = iblock >> HFSPLUS_SB(sb).fs_shift;

	if (iblock >= inode->i_blocks) {
		if (iblock > inode->i_blocks || !create)
			return -EIO;
		if (ablock >= HFSPLUS_I(inode).alloc_blocks) {
			res = hfsplus_file_extend(inode);
			if (res)
				return res;
		}
	} else
		create = 0;

	if (ablock < HFSPLUS_I(inode).first_blocks) {
		dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).first_extents, ablock);
		goto done;
	}

	down(&HFSPLUS_I(inode).extents_lock);
	res = hfsplus_ext_read_extent(inode, ablock);
	if (!res) {
		dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).cached_extents, ablock -
					     HFSPLUS_I(inode).cached_start);
	} else {
		up(&HFSPLUS_I(inode).extents_lock);
		return -EIO;
	}
	up(&HFSPLUS_I(inode).extents_lock);

done:
	dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n", inode->i_ino, (long long)iblock, dblock);
	mask = (1 << HFSPLUS_SB(sb).fs_shift) - 1;
	map_bh(bh_result, sb, (dblock << HFSPLUS_SB(sb).fs_shift) + HFSPLUS_SB(sb).blockoffset + (iblock & mask));
	if (create) {
		set_buffer_new(bh_result);
		HFSPLUS_I(inode).phys_size += sb->s_blocksize;
		inode->i_blocks++;
		mark_inode_dirty(inode);
	}
	return 0;
}
예제 #3
0
int hfsplus_file_extend(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	u32 start, len, goal;
	int res;

	if (HFSPLUS_SB(sb).alloc_file->i_size * 8 < HFSPLUS_SB(sb).total_blocks - HFSPLUS_SB(sb).free_blocks + 8) {
		// extend alloc file
		printk("extend alloc file! (%Lu,%u,%u)\n", HFSPLUS_SB(sb).alloc_file->i_size * 8,
			HFSPLUS_SB(sb).total_blocks, HFSPLUS_SB(sb).free_blocks);
		return -ENOSPC;
		//BUG();
	}

	down(&HFSPLUS_I(inode).extents_lock);
	if (HFSPLUS_I(inode).alloc_blocks == HFSPLUS_I(inode).first_blocks)
		goal = hfsplus_ext_lastblock(HFSPLUS_I(inode).first_extents);
	else {
		res = hfsplus_ext_read_extent(inode, HFSPLUS_I(inode).alloc_blocks);
		if (res)
			goto out;
		goal = hfsplus_ext_lastblock(HFSPLUS_I(inode).cached_extents);
	}

	len = HFSPLUS_I(inode).clump_blocks;
	start = hfsplus_block_allocate(sb, HFSPLUS_SB(sb).total_blocks, goal, &len);
	if (start >= HFSPLUS_SB(sb).total_blocks) {
		start = hfsplus_block_allocate(sb, goal, 0, &len);
		if (start >= goal) {
			res = -ENOSPC;
			goto out;
		}
	}

	dprint(DBG_EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len);
	if (HFSPLUS_I(inode).alloc_blocks <= HFSPLUS_I(inode).first_blocks) {
		if (!HFSPLUS_I(inode).first_blocks) {
			dprint(DBG_EXTENT, "first extents\n");
			/* no extents yet */
			HFSPLUS_I(inode).first_extents[0].start_block = cpu_to_be32(start);
			HFSPLUS_I(inode).first_extents[0].block_count = cpu_to_be32(len);
			res = 0;
		} else {
			/* try to append to extents in inode */
			res = hfsplus_add_extent(HFSPLUS_I(inode).first_extents,
						 HFSPLUS_I(inode).alloc_blocks,
						 start, len);
			if (res == -ENOSPC)
				goto insert_extent;
		}
		if (!res) {
			hfsplus_dump_extent(HFSPLUS_I(inode).first_extents);
			HFSPLUS_I(inode).first_blocks += len;
		}
	} else {
		res = hfsplus_add_extent(HFSPLUS_I(inode).cached_extents,
					 HFSPLUS_I(inode).alloc_blocks -
					 HFSPLUS_I(inode).cached_start,
					 start, len);
		if (!res) {
			hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
			HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY;
			HFSPLUS_I(inode).cached_blocks += len;
		} else if (res == -ENOSPC)
			goto insert_extent;
	}
out:
	up(&HFSPLUS_I(inode).extents_lock);
	if (!res) {
		HFSPLUS_I(inode).alloc_blocks += len;
		mark_inode_dirty(inode);
	}
	return res;

insert_extent:
	dprint(DBG_EXTENT, "insert new extent\n");
	hfsplus_ext_write_extent(inode);

	memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
	HFSPLUS_I(inode).cached_extents[0].start_block = cpu_to_be32(start);
	HFSPLUS_I(inode).cached_extents[0].block_count = cpu_to_be32(len);
	hfsplus_dump_extent(HFSPLUS_I(inode).cached_extents);
	HFSPLUS_I(inode).flags |= HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW;
	HFSPLUS_I(inode).cached_start = HFSPLUS_I(inode).alloc_blocks;
	HFSPLUS_I(inode).cached_blocks = len;

	res = 0;
	goto out;
}
예제 #4
0
int hfsplus_file_extend(struct inode *inode, bool zeroout)
{
	struct super_block *sb = inode->i_sb;
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	u32 start, len, goal;
	int res;

	if (sbi->alloc_file->i_size * 8 <
	    sbi->total_blocks - sbi->free_blocks + 8) {
		/* extend alloc file */
		pr_err("extend alloc file! (%llu,%u,%u)\n",
		       sbi->alloc_file->i_size * 8,
		       sbi->total_blocks, sbi->free_blocks);
		return -ENOSPC;
	}

	mutex_lock(&hip->extents_lock);
	if (hip->alloc_blocks == hip->first_blocks)
		goal = hfsplus_ext_lastblock(hip->first_extents);
	else {
		res = hfsplus_ext_read_extent(inode, hip->alloc_blocks);
		if (res)
			goto out;
		goal = hfsplus_ext_lastblock(hip->cached_extents);
	}

	len = hip->clump_blocks;
	start = hfsplus_block_allocate(sb, sbi->total_blocks, goal, &len);
	if (start >= sbi->total_blocks) {
		start = hfsplus_block_allocate(sb, goal, 0, &len);
		if (start >= goal) {
			res = -ENOSPC;
			goto out;
		}
	}

	if (zeroout) {
		res = sb_issue_zeroout(sb, start, len, GFP_NOFS);
		if (res)
			goto out;
	}

	hfs_dbg(EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len);

	if (hip->alloc_blocks <= hip->first_blocks) {
		if (!hip->first_blocks) {
			hfs_dbg(EXTENT, "first extents\n");
			/* no extents yet */
			hip->first_extents[0].start_block = cpu_to_be32(start);
			hip->first_extents[0].block_count = cpu_to_be32(len);
			res = 0;
		} else {
			/* try to append to extents in inode */
			res = hfsplus_add_extent(hip->first_extents,
						 hip->alloc_blocks,
						 start, len);
			if (res == -ENOSPC)
				goto insert_extent;
		}
		if (!res) {
			hfsplus_dump_extent(hip->first_extents);
			hip->first_blocks += len;
		}
	} else {
		res = hfsplus_add_extent(hip->cached_extents,
					 hip->alloc_blocks - hip->cached_start,
					 start, len);
		if (!res) {
			hfsplus_dump_extent(hip->cached_extents);
			hip->extent_state |= HFSPLUS_EXT_DIRTY;
			hip->cached_blocks += len;
		} else if (res == -ENOSPC)
			goto insert_extent;
	}
out:
	if (!res) {
		hip->alloc_blocks += len;
		mutex_unlock(&hip->extents_lock);
		hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
		return 0;
	}
	mutex_unlock(&hip->extents_lock);
	return res;

insert_extent:
	hfs_dbg(EXTENT, "insert new extent\n");
	res = hfsplus_ext_write_extent_locked(inode);
	if (res)
		goto out;

	memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
	hip->cached_extents[0].start_block = cpu_to_be32(start);
	hip->cached_extents[0].block_count = cpu_to_be32(len);
	hfsplus_dump_extent(hip->cached_extents);
	hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW;
	hip->cached_start = hip->alloc_blocks;
	hip->cached_blocks = len;

	res = 0;
	goto out;
}
예제 #5
0
/* Get a block at iblock for inode, possibly allocating if create */
int hfsplus_get_block(struct inode *inode, sector_t iblock,
		      struct buffer_head *bh_result, int create)
{
	struct super_block *sb = inode->i_sb;
	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
	int res = -EIO;
	u32 ablock, dblock, mask;
	sector_t sector;
	int was_dirty = 0;

	/* Convert inode block to disk allocation block */
	ablock = iblock >> sbi->fs_shift;

	if (iblock >= hip->fs_blocks) {
		if (iblock > hip->fs_blocks || !create)
			return -EIO;
		if (ablock >= hip->alloc_blocks) {
			res = hfsplus_file_extend(inode, false);
			if (res)
				return res;
		}
	} else
		create = 0;

	if (ablock < hip->first_blocks) {
		dblock = hfsplus_ext_find_block(hip->first_extents, ablock);
		goto done;
	}

	if (inode->i_ino == HFSPLUS_EXT_CNID)
		return -EIO;

	mutex_lock(&hip->extents_lock);

	/*
	 * hfsplus_ext_read_extent will write out a cached extent into
	 * the extents btree.  In that case we may have to mark the inode
	 * dirty even for a pure read of an extent here.
	 */
	was_dirty = (hip->extent_state & HFSPLUS_EXT_DIRTY);
	res = hfsplus_ext_read_extent(inode, ablock);
	if (res) {
		mutex_unlock(&hip->extents_lock);
		return -EIO;
	}
	dblock = hfsplus_ext_find_block(hip->cached_extents,
					ablock - hip->cached_start);
	mutex_unlock(&hip->extents_lock);

done:
	hfs_dbg(EXTENT, "get_block(%lu): %llu - %u\n",
		inode->i_ino, (long long)iblock, dblock);

	mask = (1 << sbi->fs_shift) - 1;
	sector = ((sector_t)dblock << sbi->fs_shift) +
		  sbi->blockoffset + (iblock & mask);
	map_bh(bh_result, sb, sector);

	if (create) {
		set_buffer_new(bh_result);
		hip->phys_size += sb->s_blocksize;
		hip->fs_blocks++;
		inode_add_bytes(inode, sb->s_blocksize);
	}
	if (create || was_dirty)
		mark_inode_dirty(inode);
	return 0;
}
예제 #6
0
/* Get a block at iblock for inode, possibly allocating if create */
int hfsplus_get_block(struct inode *inode, sector_t iblock,
		      struct buffer_head *bh_result, int create)
{
	struct super_block *sb;
	int res = -EIO;
	u32 ablock, dblock, mask;
	int shift;
	hfsplus_handle_t *hfsplus_handle, tmp_hfsplus_handle;

	tmp_hfsplus_handle.journaled = !HFSPLUS_JOURNAL_PRESENT;
	tmp_hfsplus_handle.handle = NULL;

	sb = inode->i_sb;

	/* Journal device */
	if (HFSPLUS_SB(sb).jnl.journaled == HFSPLUS_JOURNAL_PRESENT) {
		/* Write Metadata */
		if (((inode->i_mapping->a_ops == &hfsplus_journalled_btree_aops) || 
			(inode->i_mapping->a_ops == &hfsplus_journalled_aops)) && create) {
			hfsplus_handle = hfsplus_jbd_current_handle();
			if (hfsplus_handle == NULL) {
				printk("hfsplus_handle is NULL\n");
				hfsplus_handle = &tmp_hfsplus_handle; 
			}
		}
		else { 
			hfsplus_handle = &tmp_hfsplus_handle;
		}
	}
	/* Non-journal device */ 
	else {
		hfsplus_handle = &tmp_hfsplus_handle;
	}

	/* Convert inode block to disk allocation block */
	shift = HFSPLUS_SB(sb).alloc_blksz_shift - sb->s_blocksize_bits;
	ablock = iblock >> HFSPLUS_SB(sb).fs_shift;

	if (iblock >= HFSPLUS_I(inode).fs_blocks) {
		if (iblock > HFSPLUS_I(inode).fs_blocks || !create) {
			return -EIO;
		}
		if (ablock >= HFSPLUS_I(inode).alloc_blocks) {
			res = hfsplus_file_extend(hfsplus_handle, inode);
			if (res) {
				return res;
			}
		}
	} else
		create = 0;

	if (ablock < HFSPLUS_I(inode).first_blocks) {
		dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).first_extents, ablock);
		goto done;
	}

	mutex_lock(&HFSPLUS_I(inode).extents_lock);
	res = hfsplus_ext_read_extent(hfsplus_handle, inode, ablock);
	if (!res) {
		dblock = hfsplus_ext_find_block(HFSPLUS_I(inode).cached_extents, ablock -
					     HFSPLUS_I(inode).cached_start);
	} else {
		mutex_unlock(&HFSPLUS_I(inode).extents_lock);
		return -EIO;
	}
	mutex_unlock(&HFSPLUS_I(inode).extents_lock);

done:
	dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n", inode->i_ino, (long long)iblock, dblock);
	mask = (1 << HFSPLUS_SB(sb).fs_shift) - 1;
	map_bh(bh_result, sb, (dblock << HFSPLUS_SB(sb).fs_shift) + HFSPLUS_SB(sb).blockoffset + (iblock & mask));
	if (create) {
		set_buffer_new(bh_result);
		HFSPLUS_I(inode).phys_size += sb->s_blocksize;
		HFSPLUS_I(inode).fs_blocks++;
		inode_add_bytes(inode, sb->s_blocksize);
		if (hfsplus_journalled_mark_inode_dirty(__FUNCTION__, hfsplus_handle, inode)) {
			printk("HFS+-fs: Error in %s()\n", __FUNCTION__);
			return -1;
		}
	}
	return 0;
}