[thirdparty/e2fsprogs.git] / lib / ext2fs / alloc.c

/*
 * alloc.c --- allocate new inodes, blocks for ext2fs
 *
 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Library
 * General Public License, version 2.
 * %End-Header%
 */

#include "config.h"
#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <time.h>
#include <string.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include "ext2_fs.h"
#include "ext2fs.h"

#define min(a, b) ((a) < (b) ? (a) : (b))

#undef DEBUG

#ifdef DEBUG
# define dbg_printf(f, a...)  do {printf(f, ## a); fflush(stdout); } while (0)
#else
# define dbg_printf(f, a...)
#endif

/*
 * Clear the uninit block bitmap flag if necessary
 */
void ext2fs_clear_block_uninit(ext2_filsys fs, dgrp_t group)
{
	if (!ext2fs_has_group_desc_csum(fs) ||
	    !(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
		return;

	/* uninit block bitmaps are now initialized in read_bitmaps() */

	ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
	ext2fs_group_desc_csum_set(fs, group);
	ext2fs_mark_super_dirty(fs);
	ext2fs_mark_bb_dirty(fs);
}

/*
 * Check for uninit inode bitmaps and deal with them appropriately
 */
static void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map,
			  dgrp_t group)
{
	ext2_ino_t	i, ino;

	if (!ext2fs_has_group_desc_csum(fs) ||
	    !(ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)))
		return;

	ino = (group * fs->super->s_inodes_per_group) + 1;
	for (i=0; i < fs->super->s_inodes_per_group; i++, ino++)
		ext2fs_fast_unmark_inode_bitmap2(map, ino);

	ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
	/* Mimics what the kernel does */
	ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
	ext2fs_group_desc_csum_set(fs, group);
	ext2fs_mark_ib_dirty(fs);
	ext2fs_mark_super_dirty(fs);
}

/*
 * Right now, just search forward from the parent directory's block
 * group to find the next free inode.
 *
 * Should have a special policy for directories.
 */
errcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir,
			   int mode EXT2FS_ATTR((unused)),
			   ext2fs_inode_bitmap map, ext2_ino_t *ret)
{
	ext2_ino_t	start_inode = 0;
	ext2_ino_t	i, ino_in_group, upto, first_zero;
	errcode_t	retval;
	dgrp_t		group;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if (!map)
		map = fs->inode_map;
	if (!map)
		return EXT2_ET_NO_INODE_BITMAP;

	if (dir > 0) {
		group = (dir - 1) / EXT2_INODES_PER_GROUP(fs->super);
		start_inode = (group * EXT2_INODES_PER_GROUP(fs->super)) + 1;
	}
	if (start_inode < EXT2_FIRST_INODE(fs->super))
		start_inode = EXT2_FIRST_INODE(fs->super);
	if (start_inode > fs->super->s_inodes_count)
		return EXT2_ET_INODE_ALLOC_FAIL;
	i = start_inode;
	do {
		ino_in_group = (i - 1) % EXT2_INODES_PER_GROUP(fs->super);
		group = (i - 1) / EXT2_INODES_PER_GROUP(fs->super);

		check_inode_uninit(fs, map, group);
		upto = i + (EXT2_INODES_PER_GROUP(fs->super) - ino_in_group);
		if (i < start_inode && upto >= start_inode)
			upto = start_inode - 1;
		if (upto > fs->super->s_inodes_count)
			upto = fs->super->s_inodes_count;

		retval = ext2fs_find_first_zero_inode_bitmap2(map, i, upto,
							      &first_zero);
		if (retval == 0) {
			i = first_zero;
			break;
		}
		if (retval != ENOENT)
			return EXT2_ET_INODE_ALLOC_FAIL;
		i = upto + 1;
		if (i > fs->super->s_inodes_count)
			i = EXT2_FIRST_INODE(fs->super);
	} while (i != start_inode);

	if (ext2fs_test_inode_bitmap2(map, i))
		return EXT2_ET_INODE_ALLOC_FAIL;
	*ret = i;
	return 0;
}

/*
 * Stupid algorithm --- we now just search forward starting from the
 * goal.  Should put in a smarter one someday....
 */
errcode_t ext2fs_new_block2(ext2_filsys fs, blk64_t goal,
			   ext2fs_block_bitmap map, blk64_t *ret)
{
	errcode_t retval;
	blk64_t	b = 0;
	errcode_t (*gab)(ext2_filsys fs, blk64_t goal, blk64_t *ret);

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if (!map && fs->get_alloc_block) {
		/*
		 * In case there are clients out there whose get_alloc_block
		 * handlers call ext2fs_new_block2 with a NULL block map,
		 * temporarily swap out the function pointer so that we don't
		 * end up in an infinite loop.
		 */
		gab = fs->get_alloc_block;
		fs->get_alloc_block = NULL;
		retval = gab(fs, goal, &b);
		fs->get_alloc_block = gab;
		goto allocated;
	}
	if (!map)
		map = fs->block_map;
	if (!map)
		return EXT2_ET_NO_BLOCK_BITMAP;
	if (!goal || (goal >= ext2fs_blocks_count(fs->super)))
		goal = fs->super->s_first_data_block;
	goal &= ~EXT2FS_CLUSTER_MASK(fs);

	retval = ext2fs_find_first_zero_block_bitmap2(map,
			goal, ext2fs_blocks_count(fs->super) - 1, &b);
	if ((retval == ENOENT) && (goal != fs->super->s_first_data_block))
		retval = ext2fs_find_first_zero_block_bitmap2(map,
			fs->super->s_first_data_block, goal - 1, &b);
allocated:
	if (retval == ENOENT)
		return EXT2_ET_BLOCK_ALLOC_FAIL;
	if (retval)
		return retval;

	ext2fs_clear_block_uninit(fs, ext2fs_group_of_blk2(fs, b));
	*ret = b;
	return 0;
}

errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
			   ext2fs_block_bitmap map, blk_t *ret)
{
	errcode_t retval;
	blk64_t val;
	retval = ext2fs_new_block2(fs, goal, map, &val);
	if (!retval)
		*ret = (blk_t) val;
	return retval;
}

/*
 * This function zeros out the allocated block, and updates all of the
 * appropriate filesystem records.
 */
errcode_t ext2fs_alloc_block2(ext2_filsys fs, blk64_t goal,
			     char *block_buf, blk64_t *ret)
{
	errcode_t	retval;
	blk64_t		block;

	if (fs->get_alloc_block) {
		retval = (fs->get_alloc_block)(fs, goal, &block);
		if (retval)
			goto fail;
	} else {
		if (!fs->block_map) {
			retval = ext2fs_read_block_bitmap(fs);
			if (retval)
				goto fail;
		}

		retval = ext2fs_new_block2(fs, goal, 0, &block);
		if (retval)
			goto fail;
	}

	if (block_buf) {
		memset(block_buf, 0, fs->blocksize);
		retval = io_channel_write_blk64(fs->io, block, 1, block_buf);
	} else
		retval = ext2fs_zero_blocks2(fs, block, 1, NULL, NULL);
	if (retval)
		goto fail;

	ext2fs_block_alloc_stats2(fs, block, +1);
	*ret = block;

fail:
	return retval;
}

errcode_t ext2fs_alloc_block(ext2_filsys fs, blk_t goal,
			     char *block_buf, blk_t *ret)
{
	errcode_t retval;
	blk64_t	val;
	retval = ext2fs_alloc_block2(fs, goal, block_buf, &val);
	if (!retval)
		*ret = (blk_t) val;
	return retval;
}

errcode_t ext2fs_get_free_blocks2(ext2_filsys fs, blk64_t start, blk64_t finish,
				 int num, ext2fs_block_bitmap map, blk64_t *ret)
{
	blk64_t	b = start;
	int	c_ratio;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	if (!map)
		map = fs->block_map;
	if (!map)
		return EXT2_ET_NO_BLOCK_BITMAP;
	if (!b)
		b = fs->super->s_first_data_block;
	if (!finish)
		finish = start;
	if (!num)
		num = 1;
	c_ratio = 1 << ext2fs_get_bitmap_granularity(map);
	b &= ~(c_ratio - 1);
	finish &= ~(c_ratio -1);
	do {
		if (b + num - 1 >= ext2fs_blocks_count(fs->super)) {
			if (finish > start)
				return EXT2_ET_BLOCK_ALLOC_FAIL;
			b = fs->super->s_first_data_block;
		}
		if (ext2fs_fast_test_block_bitmap_range2(map, b, num)) {
			*ret = b;
			return 0;
		}
		b += c_ratio;
	} while (b != finish);
	return EXT2_ET_BLOCK_ALLOC_FAIL;
}

errcode_t ext2fs_get_free_blocks(ext2_filsys fs, blk_t start, blk_t finish,
				 int num, ext2fs_block_bitmap map, blk_t *ret)
{
	errcode_t retval;
	blk64_t val;
	retval = ext2fs_get_free_blocks2(fs, start, finish, num, map, &val);
	if(!retval)
		*ret = (blk_t) val;
	return retval;
}

void ext2fs_set_alloc_block_callback(ext2_filsys fs,
				     errcode_t (*func)(ext2_filsys fs,
						       blk64_t goal,
						       blk64_t *ret),
				     errcode_t (**old)(ext2_filsys fs,
						       blk64_t goal,
						       blk64_t *ret))
{
	if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
		return;

	if (old)
		*old = fs->get_alloc_block;

	fs->get_alloc_block = func;
}

blk64_t ext2fs_find_inode_goal(ext2_filsys fs, ext2_ino_t ino,
			       struct ext2_inode *inode, blk64_t lblk)
{
	dgrp_t			group;
	__u8			log_flex;
	struct ext2fs_extent	extent;
	ext2_extent_handle_t	handle = NULL;
	errcode_t		err;

	if (inode == NULL || ext2fs_inode_data_blocks2(fs, inode) == 0)
		goto no_blocks;

	if (inode->i_flags & EXT4_INLINE_DATA_FL)
		goto no_blocks;

	if (inode->i_flags & EXT4_EXTENTS_FL) {
		err = ext2fs_extent_open2(fs, ino, inode, &handle);
		if (err)
			goto no_blocks;
		err = ext2fs_extent_goto2(handle, 0, lblk);
		if (err)
			goto no_blocks;
		err = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
		if (err)
			goto no_blocks;
		ext2fs_extent_free(handle);
		return extent.e_pblk + (lblk - extent.e_lblk);
	}

	/* block mapped file; see if block zero is mapped? */
	if (inode->i_block[0])
		return inode->i_block[0];

no_blocks:
	ext2fs_extent_free(handle);
	log_flex = fs->super->s_log_groups_per_flex;
	group = ext2fs_group_of_ino(fs, ino);
	if (log_flex)
		group = group & ~((1 << (log_flex)) - 1);
	return ext2fs_group_first_block2(fs, group);
}

/*
 * Starting at _goal_, scan around the filesystem to find a run of free blocks
 * that's at least _len_ blocks long.  Possible flags:
 * - EXT2_NEWRANGE_EXACT_GOAL: The range of blocks must start at _goal_.
 * - EXT2_NEWRANGE_MIN_LENGTH: do not return a allocation shorter than _len_.
 * - EXT2_NEWRANGE_ZERO_BLOCKS: Zero blocks pblk to pblk+plen before returning.
 *
 * The starting block is returned in _pblk_ and the length is returned via
 * _plen_.  The blocks are not marked in the bitmap; the caller must mark
 * however much of the returned run they actually use, hopefully via
 * ext2fs_block_alloc_stats_range().
 *
 * This function can return a range that is longer than what was requested.
 */
errcode_t ext2fs_new_range(ext2_filsys fs, int flags, blk64_t goal,
			   blk64_t len, ext2fs_block_bitmap map, blk64_t *pblk,
			   blk64_t *plen)
{
	errcode_t retval;
	blk64_t start, end, b;
	int looped = 0;
	blk64_t max_blocks = ext2fs_blocks_count(fs->super);
	errcode_t (*nrf)(ext2_filsys fs, int flags, blk64_t goal,
			 blk64_t len, blk64_t *pblk, blk64_t *plen);

	dbg_printf("%s: flags=0x%x goal=%llu len=%llu\n", __func__, flags,
		   goal, len);
	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
	if (len == 0 || (flags & ~EXT2_NEWRANGE_ALL_FLAGS))
		return EXT2_ET_INVALID_ARGUMENT;

	if (!map && fs->new_range) {
		/*
		 * In case there are clients out there whose new_range
		 * handlers call ext2fs_new_range with a NULL block map,
		 * temporarily swap out the function pointer so that we don't
		 * end up in an infinite loop.
		 */
		nrf = fs->new_range;
		fs->new_range = NULL;
		retval = nrf(fs, flags, goal, len, pblk, plen);
		fs->new_range = nrf;
		if (retval)
			return retval;
		start = *pblk;
		end = *pblk + *plen;
		goto allocated;
	}
	if (!map)
		map = fs->block_map;
	if (!map)
		return EXT2_ET_NO_BLOCK_BITMAP;
	if (!goal || goal >= ext2fs_blocks_count(fs->super))
		goal = fs->super->s_first_data_block;

	start = goal;
	while (!looped || start <= goal) {
		retval = ext2fs_find_first_zero_block_bitmap2(map, start,
							      max_blocks - 1,
							      &start);
		if (retval == ENOENT) {
			/*
			 * If there are no free blocks beyond the starting
			 * point, try scanning the whole filesystem, unless the
			 * user told us only to allocate from _goal_, or if
			 * we're already scanning the whole filesystem.
			 */
			if (flags & EXT2_NEWRANGE_FIXED_GOAL ||
			    start == fs->super->s_first_data_block)
				goto fail;
			start = fs->super->s_first_data_block;
			continue;
		} else if (retval)
			goto errout;

		if (flags & EXT2_NEWRANGE_FIXED_GOAL && start != goal)
			goto fail;

		b = min(start + len - 1, max_blocks - 1);
		retval =  ext2fs_find_first_set_block_bitmap2(map, start, b,
							      &end);
		if (retval == ENOENT)
			end = b + 1;
		else if (retval)
			goto errout;

		if (!(flags & EXT2_NEWRANGE_MIN_LENGTH) ||
		    (end - start) >= len) {
			/* Success! */
			*pblk = start;
			*plen = end - start;
			dbg_printf("%s: new_range goal=%llu--%llu "
				   "blk=%llu--%llu %llu\n",
				   __func__, goal, goal + len - 1,
				   *pblk, *pblk + *plen - 1, *plen);
allocated:
			for (b = start; b < end;
			     b += fs->super->s_blocks_per_group)
				ext2fs_clear_block_uninit(fs,
						ext2fs_group_of_blk2(fs, b));
			return 0;
		}

		if (flags & EXT2_NEWRANGE_FIXED_GOAL)
			goto fail;
		start = end;
		if (start >= max_blocks) {
			if (looped)
				goto fail;
			looped = 1;
			start = fs->super->s_first_data_block;
		}
	}

fail:
	retval = EXT2_ET_BLOCK_ALLOC_FAIL;
errout:
	return retval;
}

void ext2fs_set_new_range_callback(ext2_filsys fs,
	errcode_t (*func)(ext2_filsys fs, int flags, blk64_t goal,
			       blk64_t len, blk64_t *pblk, blk64_t *plen),
	errcode_t (**old)(ext2_filsys fs, int flags, blk64_t goal,
			       blk64_t len, blk64_t *pblk, blk64_t *plen))
{
	if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
		return;

	if (old)
		*old = fs->new_range;

	fs->new_range = func;
}

errcode_t ext2fs_alloc_range(ext2_filsys fs, int flags, blk64_t goal,
			     blk_t len, blk64_t *ret)
{
	int newr_flags = EXT2_NEWRANGE_MIN_LENGTH;
	errcode_t retval;
	blk64_t plen;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
	if (len == 0 || (flags & ~EXT2_ALLOCRANGE_ALL_FLAGS))
		return EXT2_ET_INVALID_ARGUMENT;

	if (flags & EXT2_ALLOCRANGE_FIXED_GOAL)
		newr_flags |= EXT2_NEWRANGE_FIXED_GOAL;

	retval = ext2fs_new_range(fs, newr_flags, goal, len, NULL, ret, &plen);
	if (retval)
		return retval;

	if (plen < len)
		return EXT2_ET_BLOCK_ALLOC_FAIL;

	if (flags & EXT2_ALLOCRANGE_ZERO_BLOCKS) {
		retval = ext2fs_zero_blocks2(fs, *ret, len, NULL, NULL);
		if (retval)
			return retval;
	}

	ext2fs_block_alloc_stats_range(fs, *ret, len, +1);
	return retval;
}
Commit	Line	Data
3839e657 TT	1	/*
	2	* alloc.c --- allocate new inodes, blocks for ext2fs
	3	*
21c84b71 TT	4	* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
	5	*
	6	* %Begin-Header%
543547a5 TT	7	* This file may be redistributed under the terms of the GNU Library
543547a5 TT	8	* General Public License, version 2.
21c84b71	9	* %End-Header%
3839e657 TT	10	*/
3839e657 TT	11
d1154eb4	12	#include "config.h"
3839e657	13	#include <stdio.h>
4cbe8af4	14	#if HAVE_UNISTD_H
3839e657	15	#include <unistd.h>
4cbe8af4	16	#endif
3839e657	17	#include <time.h>
30fab293	18	#include <string.h>
1d2ff46a	19	#if HAVE_SYS_STAT_H
3839e657	20	#include <sys/stat.h>
1d2ff46a TT	21	#endif
1d2ff46a TT	22	#if HAVE_SYS_TYPES_H
3839e657	23	#include <sys/types.h>
1d2ff46a	24	#endif
3839e657	25
b5abe6fa	26	#include "ext2_fs.h"
3839e657 TT	27	#include "ext2fs.h"
3839e657 TT	28
5a980264 DW	29	#define min(a, b) ((a) < (b) ? (a) : (b))
	30
	31	#undef DEBUG
	32
	33	#ifdef DEBUG
	34	# define dbg_printf(f, a...) do {printf(f, ## a); fflush(stdout); } while (0)
	35	#else
	36	# define dbg_printf(f, a...)
	37	#endif
	38
c71d7813	39	/*
dd9aa132	40	* Clear the uninit block bitmap flag if necessary
c71d7813	41	*/
f3745728	42	void ext2fs_clear_block_uninit(ext2_filsys fs, dgrp_t group)
c71d7813	43	{
5b58dc23	44	if (!ext2fs_has_group_desc_csum(fs) \|\|
cd65a24e	45	!(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
c71d7813 TT	46	return;
c71d7813 TT	47
8e44eb64	48	/* uninit block bitmaps are now initialized in read_bitmaps() */
b0ecb787	49
e633b58a	50	ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
c71d7813	51	ext2fs_group_desc_csum_set(fs, group);
538eb878 TT	52	ext2fs_mark_super_dirty(fs);
538eb878 TT	53	ext2fs_mark_bb_dirty(fs);
c71d7813 TT	54	}
	55
	56	/*
	57	* Check for uninit inode bitmaps and deal with them appropriately
	58	*/
03fa6f8a	59	static void check_inode_uninit(ext2_filsys fs, ext2fs_inode_bitmap map,
c71d7813 TT	60	dgrp_t group)
c71d7813 TT	61	{
03fa6f8a	62	ext2_ino_t i, ino;
c71d7813	63
5b58dc23	64	if (!ext2fs_has_group_desc_csum(fs) \|\|
cd65a24e	65	!(ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)))
c71d7813 TT	66	return;
	67
	68	ino = (group * fs->super->s_inodes_per_group) + 1;
	69	for (i=0; i < fs->super->s_inodes_per_group; i++, ino++)
8f82ef98	70	ext2fs_fast_unmark_inode_bitmap2(map, ino);
c71d7813	71
e633b58a	72	ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT);
dd9aa132 TT	73	/* Mimics what the kernel does */
dd9aa132 TT	74	ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
538eb878 TT	75	ext2fs_group_desc_csum_set(fs, group);
	76	ext2fs_mark_ib_dirty(fs);
	77	ext2fs_mark_super_dirty(fs);
c71d7813 TT	78	}
c71d7813 TT	79
3839e657 TT	80	/*
	81	* Right now, just search forward from the parent directory's block
	82	* group to find the next free inode.
	83	*
	84	* Should have a special policy for directories.
	85	*/
efc6f628	86	errcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir,
54434927	87	int mode EXT2FS_ATTR((unused)),
31dbecd4	88	ext2fs_inode_bitmap map, ext2_ino_t *ret)
3839e657	89	{
c1a1e7fc SL	90	ext2_ino_t start_inode = 0;
	91	ext2_ino_t i, ino_in_group, upto, first_zero;
	92	errcode_t retval;
	93	dgrp_t group;
3839e657	94
f3db3566	95	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
efc6f628	96
3839e657 TT	97	if (!map)
	98	map = fs->inode_map;
	99	if (!map)
	100	return EXT2_ET_NO_INODE_BITMAP;
efc6f628	101
c1a1e7fc SL	102	if (dir > 0) {
	103	group = (dir - 1) / EXT2_INODES_PER_GROUP(fs->super);
	104	start_inode = (group * EXT2_INODES_PER_GROUP(fs->super)) + 1;
	105	}
7f88b043 TT	106	if (start_inode < EXT2_FIRST_INODE(fs->super))
7f88b043 TT	107	start_inode = EXT2_FIRST_INODE(fs->super);
a93d4069 TT	108	if (start_inode > fs->super->s_inodes_count)
a93d4069 TT	109	return EXT2_ET_INODE_ALLOC_FAIL;
3839e657	110	i = start_inode;
3839e657	111	do {
c1a1e7fc SL	112	ino_in_group = (i - 1) % EXT2_INODES_PER_GROUP(fs->super);
	113	group = (i - 1) / EXT2_INODES_PER_GROUP(fs->super);
	114
	115	check_inode_uninit(fs, map, group);
	116	upto = i + (EXT2_INODES_PER_GROUP(fs->super) - ino_in_group);
	117	if (i < start_inode && upto >= start_inode)
	118	upto = start_inode - 1;
	119	if (upto > fs->super->s_inodes_count)
	120	upto = fs->super->s_inodes_count;
	121
	122	retval = ext2fs_find_first_zero_inode_bitmap2(map, i, upto,
	123	&first_zero);
	124	if (retval == 0) {
	125	i = first_zero;
3839e657	126	break;
75556776	127	}
c1a1e7fc SL	128	if (retval != ENOENT)
	129	return EXT2_ET_INODE_ALLOC_FAIL;
	130	i = upto + 1;
	131	if (i > fs->super->s_inodes_count)
	132	i = EXT2_FIRST_INODE(fs->super);
3839e657	133	} while (i != start_inode);
efc6f628	134
8f82ef98	135	if (ext2fs_test_inode_bitmap2(map, i))
1f0b6c1f	136	return EXT2_ET_INODE_ALLOC_FAIL;
3839e657 TT	137	*ret = i;
	138	return 0;
	139	}
	140
	141	/*
	142	* Stupid algorithm --- we now just search forward starting from the
	143	* goal. Should put in a smarter one someday....
	144	*/
8a5e1812 JS	145	errcode_t ext2fs_new_block2(ext2_filsys fs, blk64_t goal,
8a5e1812 JS	146	ext2fs_block_bitmap map, blk64_t *ret)
3839e657	147	{
424de6e8	148	errcode_t retval;
d8f401b1	149	blk64_t b = 0;
fae2467f	150	errcode_t (gab)(ext2_filsys fs, blk64_t goal, blk64_t ret);
3839e657	151
f3db3566 TT	152	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
f3db3566 TT	153
fae2467f DW	154	if (!map && fs->get_alloc_block) {
	155	/*
	156	* In case there are clients out there whose get_alloc_block
	157	* handlers call ext2fs_new_block2 with a NULL block map,
	158	* temporarily swap out the function pointer so that we don't
	159	* end up in an infinite loop.
	160	*/
	161	gab = fs->get_alloc_block;
	162	fs->get_alloc_block = NULL;
	163	retval = gab(fs, goal, &b);
	164	fs->get_alloc_block = gab;
	165	goto allocated;
	166	}
3839e657 TT	167	if (!map)
	168	map = fs->block_map;
	169	if (!map)
	170	return EXT2_ET_NO_BLOCK_BITMAP;
4efbac6f	171	if (!goal \|\| (goal >= ext2fs_blocks_count(fs->super)))
a29f4d30	172	goal = fs->super->s_first_data_block;
424de6e8 TT	173	goal &= ~EXT2FS_CLUSTER_MASK(fs);
	174
	175	retval = ext2fs_find_first_zero_block_bitmap2(map,
	176	goal, ext2fs_blocks_count(fs->super) - 1, &b);
	177	if ((retval == ENOENT) && (goal != fs->super->s_first_data_block))
	178	retval = ext2fs_find_first_zero_block_bitmap2(map,
	179	fs->super->s_first_data_block, goal - 1, &b);
fae2467f	180	allocated:
424de6e8 TT	181	if (retval == ENOENT)
	182	return EXT2_ET_BLOCK_ALLOC_FAIL;
	183	if (retval)
	184	return retval;
	185
f3745728	186	ext2fs_clear_block_uninit(fs, ext2fs_group_of_blk2(fs, b));
424de6e8 TT	187	*ret = b;
424de6e8 TT	188	return 0;
c555aebd TT	189	}
c555aebd TT	190
8a5e1812 JS	191	errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
	192	ext2fs_block_bitmap map, blk_t *ret)
	193	{
	194	errcode_t retval;
	195	blk64_t val;
	196	retval = ext2fs_new_block2(fs, goal, map, &val);
	197	if (!retval)
	198	*ret = (blk_t) val;
	199	return retval;
	200	}
	201
c555aebd	202	/*
30fab293 TT	203	* This function zeros out the allocated block, and updates all of the
30fab293 TT	204	* appropriate filesystem records.
c555aebd	205	*/
8a5e1812 JS	206	errcode_t ext2fs_alloc_block2(ext2_filsys fs, blk64_t goal,
8a5e1812 JS	207	char block_buf, blk64_t ret)
c555aebd TT	208	{
c555aebd TT	209	errcode_t retval;
8a5e1812	210	blk64_t block;
30fab293	211
f5c562e2	212	if (fs->get_alloc_block) {
8a5e1812	213	retval = (fs->get_alloc_block)(fs, goal, &block);
30fab293 TT	214	if (retval)
30fab293 TT	215	goto fail;
f5c562e2 TT	216	} else {
	217	if (!fs->block_map) {
	218	retval = ext2fs_read_block_bitmap(fs);
	219	if (retval)
	220	goto fail;
	221	}
30fab293	222
8a5e1812	223	retval = ext2fs_new_block2(fs, goal, 0, &block);
f5c562e2 TT	224	if (retval)
	225	goto fail;
	226	}
c555aebd	227
bc57b123 TT	228	if (block_buf) {
	229	memset(block_buf, 0, fs->blocksize);
	230	retval = io_channel_write_blk64(fs->io, block, 1, block_buf);
	231	} else
	232	retval = ext2fs_zero_blocks2(fs, block, 1, NULL, NULL);
c555aebd	233	if (retval)
30fab293	234	goto fail;
efc6f628	235
8a5e1812	236	ext2fs_block_alloc_stats2(fs, block, +1);
30fab293	237	*ret = block;
30fab293 TT	238
30fab293 TT	239	fail:
30fab293	240	return retval;
3839e657 TT	241	}
3839e657 TT	242
8a5e1812 JS	243	errcode_t ext2fs_alloc_block(ext2_filsys fs, blk_t goal,
	244	char block_buf, blk_t ret)
	245	{
	246	errcode_t retval;
	247	blk64_t val;
	248	retval = ext2fs_alloc_block2(fs, goal, block_buf, &val);
	249	if (!retval)
	250	*ret = (blk_t) val;
	251	return retval;
	252	}
	253
	254	errcode_t ext2fs_get_free_blocks2(ext2_filsys fs, blk64_t start, blk64_t finish,
	255	int num, ext2fs_block_bitmap map, blk64_t *ret)
3839e657	256	{
96367ad3	257	blk64_t b = start;
b0ecb787	258	int c_ratio;
3839e657	259
f3db3566 TT	260	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
f3db3566 TT	261
3839e657 TT	262	if (!map)
	263	map = fs->block_map;
	264	if (!map)
	265	return EXT2_ET_NO_BLOCK_BITMAP;
	266	if (!b)
	267	b = fs->super->s_first_data_block;
	268	if (!finish)
	269	finish = start;
	270	if (!num)
	271	num = 1;
b0ecb787 TT	272	c_ratio = 1 << ext2fs_get_bitmap_granularity(map);
	273	b &= ~(c_ratio - 1);
	274	finish &= ~(c_ratio -1);
3839e657	275	do {
203e13cf DW	276	if (b + num - 1 >= ext2fs_blocks_count(fs->super)) {
	277	if (finish > start)
	278	return EXT2_ET_BLOCK_ALLOC_FAIL;
21c84b71	279	b = fs->super->s_first_data_block;
203e13cf	280	}
8f82ef98	281	if (ext2fs_fast_test_block_bitmap_range2(map, b, num)) {
3839e657 TT	282	*ret = b;
	283	return 0;
	284	}
b0ecb787	285	b += c_ratio;
3839e657	286	} while (b != finish);
1f0b6c1f	287	return EXT2_ET_BLOCK_ALLOC_FAIL;
3839e657 TT	288	}
3839e657 TT	289
8a5e1812 JS	290	errcode_t ext2fs_get_free_blocks(ext2_filsys fs, blk_t start, blk_t finish,
	291	int num, ext2fs_block_bitmap map, blk_t *ret)
	292	{
	293	errcode_t retval;
	294	blk64_t val;
	295	retval = ext2fs_get_free_blocks2(fs, start, finish, num, map, &val);
	296	if(!retval)
	297	*ret = (blk_t) val;
	298	return retval;
	299	}
	300
efc6f628	301	void ext2fs_set_alloc_block_callback(ext2_filsys fs,
f5c562e2 TT	302	errcode_t (*func)(ext2_filsys fs,
	303	blk64_t goal,
	304	blk64_t *ret),
	305	errcode_t (**old)(ext2_filsys fs,
	306	blk64_t goal,
	307	blk64_t *ret))
	308	{
	309	if (!fs \|\| fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
	310	return;
	311
	312	if (old)
	313	*old = fs->get_alloc_block;
	314
	315	fs->get_alloc_block = func;
	316	}
7b486ec0 DW	317
	318	blk64_t ext2fs_find_inode_goal(ext2_filsys fs, ext2_ino_t ino,
	319	struct ext2_inode *inode, blk64_t lblk)
	320	{
	321	dgrp_t group;
	322	__u8 log_flex;
	323	struct ext2fs_extent extent;
	324	ext2_extent_handle_t handle = NULL;
	325	errcode_t err;
	326
	327	if (inode == NULL \|\| ext2fs_inode_data_blocks2(fs, inode) == 0)
	328	goto no_blocks;
	329
	330	if (inode->i_flags & EXT4_INLINE_DATA_FL)
	331	goto no_blocks;
	332
	333	if (inode->i_flags & EXT4_EXTENTS_FL) {
	334	err = ext2fs_extent_open2(fs, ino, inode, &handle);
	335	if (err)
	336	goto no_blocks;
	337	err = ext2fs_extent_goto2(handle, 0, lblk);
	338	if (err)
	339	goto no_blocks;
	340	err = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
	341	if (err)
	342	goto no_blocks;
	343	ext2fs_extent_free(handle);
	344	return extent.e_pblk + (lblk - extent.e_lblk);
	345	}
	346
	347	/* block mapped file; see if block zero is mapped? */
	348	if (inode->i_block[0])
	349	return inode->i_block[0];
	350
	351	no_blocks:
	352	ext2fs_extent_free(handle);
	353	log_flex = fs->super->s_log_groups_per_flex;
	354	group = ext2fs_group_of_ino(fs, ino);
	355	if (log_flex)
	356	group = group & ~((1 << (log_flex)) - 1);
	357	return ext2fs_group_first_block2(fs, group);
	358	}
5a980264 DW	359
	360	/*
	361	* Starting at _goal_, scan around the filesystem to find a run of free blocks
	362	* that's at least _len_ blocks long. Possible flags:
	363	* - EXT2_NEWRANGE_EXACT_GOAL: The range of blocks must start at _goal_.
	364	* - EXT2_NEWRANGE_MIN_LENGTH: do not return a allocation shorter than _len_.
	365	* - EXT2_NEWRANGE_ZERO_BLOCKS: Zero blocks pblk to pblk+plen before returning.
	366	*
	367	* The starting block is returned in _pblk_ and the length is returned via
	368	* _plen_. The blocks are not marked in the bitmap; the caller must mark
	369	* however much of the returned run they actually use, hopefully via
	370	* ext2fs_block_alloc_stats_range().
	371	*
	372	* This function can return a range that is longer than what was requested.
	373	*/
	374	errcode_t ext2fs_new_range(ext2_filsys fs, int flags, blk64_t goal,
	375	blk64_t len, ext2fs_block_bitmap map, blk64_t *pblk,
	376	blk64_t *plen)
	377	{
	378	errcode_t retval;
	379	blk64_t start, end, b;
	380	int looped = 0;
	381	blk64_t max_blocks = ext2fs_blocks_count(fs->super);
647e8786 DW	382	errcode_t (*nrf)(ext2_filsys fs, int flags, blk64_t goal,
647e8786 DW	383	blk64_t len, blk64_t pblk, blk64_t plen);
5a980264 DW	384
	385	dbg_printf("%s: flags=0x%x goal=%llu len=%llu\n", __func__, flags,
	386	goal, len);
	387	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
	388	if (len == 0 \|\| (flags & ~EXT2_NEWRANGE_ALL_FLAGS))
	389	return EXT2_ET_INVALID_ARGUMENT;
647e8786 DW	390
	391	if (!map && fs->new_range) {
	392	/*
	393	* In case there are clients out there whose new_range
	394	* handlers call ext2fs_new_range with a NULL block map,
	395	* temporarily swap out the function pointer so that we don't
	396	* end up in an infinite loop.
	397	*/
	398	nrf = fs->new_range;
	399	fs->new_range = NULL;
	400	retval = nrf(fs, flags, goal, len, pblk, plen);
	401	fs->new_range = nrf;
	402	if (retval)
	403	return retval;
	404	start = *pblk;
	405	end = pblk + plen;
	406	goto allocated;
	407	}
5a980264 DW	408	if (!map)
	409	map = fs->block_map;
	410	if (!map)
	411	return EXT2_ET_NO_BLOCK_BITMAP;
	412	if (!goal \|\| goal >= ext2fs_blocks_count(fs->super))
	413	goal = fs->super->s_first_data_block;
	414
	415	start = goal;
	416	while (!looped \|\| start <= goal) {
	417	retval = ext2fs_find_first_zero_block_bitmap2(map, start,
	418	max_blocks - 1,
	419	&start);
	420	if (retval == ENOENT) {
	421	/*
	422	* If there are no free blocks beyond the starting
	423	* point, try scanning the whole filesystem, unless the
	424	* user told us only to allocate from _goal_, or if
	425	* we're already scanning the whole filesystem.
	426	*/
	427	if (flags & EXT2_NEWRANGE_FIXED_GOAL \|\|
	428	start == fs->super->s_first_data_block)
	429	goto fail;
	430	start = fs->super->s_first_data_block;
	431	continue;
	432	} else if (retval)
	433	goto errout;
	434
	435	if (flags & EXT2_NEWRANGE_FIXED_GOAL && start != goal)
	436	goto fail;
	437
	438	b = min(start + len - 1, max_blocks - 1);
	439	retval = ext2fs_find_first_set_block_bitmap2(map, start, b,
	440	&end);
	441	if (retval == ENOENT)
	442	end = b + 1;
	443	else if (retval)
	444	goto errout;
	445
	446	if (!(flags & EXT2_NEWRANGE_MIN_LENGTH) \|\|
	447	(end - start) >= len) {
	448	/* Success! */
	449	*pblk = start;
	450	*plen = end - start;
	451	dbg_printf("%s: new_range goal=%llu--%llu "
	452	"blk=%llu--%llu %llu\n",
	453	__func__, goal, goal + len - 1,
	454	pblk, pblk + plen - 1, plen);
647e8786	455	allocated:
5a980264 DW	456	for (b = start; b < end;
5a980264 DW	457	b += fs->super->s_blocks_per_group)
f3745728	458	ext2fs_clear_block_uninit(fs,
5a980264 DW	459	ext2fs_group_of_blk2(fs, b));
	460	return 0;
	461	}
	462
	463	if (flags & EXT2_NEWRANGE_FIXED_GOAL)
	464	goto fail;
	465	start = end;
	466	if (start >= max_blocks) {
	467	if (looped)
	468	goto fail;
	469	looped = 1;
	470	start = fs->super->s_first_data_block;
	471	}
	472	}
	473
	474	fail:
	475	retval = EXT2_ET_BLOCK_ALLOC_FAIL;
	476	errout:
	477	return retval;
	478	}
	479
647e8786 DW	480	void ext2fs_set_new_range_callback(ext2_filsys fs,
	481	errcode_t (*func)(ext2_filsys fs, int flags, blk64_t goal,
	482	blk64_t len, blk64_t pblk, blk64_t plen),
	483	errcode_t (**old)(ext2_filsys fs, int flags, blk64_t goal,
	484	blk64_t len, blk64_t pblk, blk64_t plen))
	485	{
	486	if (!fs \|\| fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
	487	return;
	488
	489	if (old)
	490	*old = fs->new_range;
	491
	492	fs->new_range = func;
	493	}
	494
5a980264 DW	495	errcode_t ext2fs_alloc_range(ext2_filsys fs, int flags, blk64_t goal,
	496	blk_t len, blk64_t *ret)
	497	{
	498	int newr_flags = EXT2_NEWRANGE_MIN_LENGTH;
	499	errcode_t retval;
	500	blk64_t plen;
	501
	502	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
	503	if (len == 0 \|\| (flags & ~EXT2_ALLOCRANGE_ALL_FLAGS))
	504	return EXT2_ET_INVALID_ARGUMENT;
	505
	506	if (flags & EXT2_ALLOCRANGE_FIXED_GOAL)
	507	newr_flags \|= EXT2_NEWRANGE_FIXED_GOAL;
	508
	509	retval = ext2fs_new_range(fs, newr_flags, goal, len, NULL, ret, &plen);
	510	if (retval)
	511	return retval;
	512
	513	if (plen < len)
	514	return EXT2_ET_BLOCK_ALLOC_FAIL;
	515
	516	if (flags & EXT2_ALLOCRANGE_ZERO_BLOCKS) {
	517	retval = ext2fs_zero_blocks2(fs, *ret, len, NULL, NULL);
	518	if (retval)
	519	return retval;
	520	}
	521
	522	ext2fs_block_alloc_stats_range(fs, *ret, len, +1);
	523	return retval;
	524	}