예제 #1
0
/*
 * There are two policies for allocating an inode.  If the new inode is
 * a directory, then a forward search is made for a block group with both
 * free space and a low directory-to-inode ratio; if that fails, then of
 * the groups with above-average free space, that group with the fewest
 * directories already is chosen.
 *
 * For other inodes, search forward from the parent directory's block
 * group to find a free inode.
 */
struct inode *ext3_new_inode(handle_t *handle, struct inode * dir,
			     const struct qstr *qstr, int mode)
{
	struct super_block *sb;
	struct buffer_head *bitmap_bh = NULL;
	struct buffer_head *bh2;
	int group;
	unsigned long ino = 0;
	struct inode * inode;
	struct ext3_group_desc * gdp = NULL;
	struct ext3_super_block * es;
	struct ext3_inode_info *ei;
	struct ext3_sb_info *sbi;
	int err = 0;
	struct inode *ret;
	int i;

	/* Cannot create files in a deleted directory */
	if (!dir || !dir->i_nlink)
		return ERR_PTR(-EPERM);

	sb = dir->i_sb;
	trace_ext3_request_inode(dir, mode);
	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	ei = EXT3_I(inode);

	sbi = EXT3_SB(sb);
	es = sbi->s_es;
	if (S_ISDIR(mode)) {
		if (test_opt (sb, OLDALLOC))
			group = find_group_dir(sb, dir);
		else
			group = find_group_orlov(sb, dir);
	} else
		group = find_group_other(sb, dir);

	err = -ENOSPC;
	if (group == -1)
		goto out;

	for (i = 0; i < sbi->s_groups_count; i++) {
		err = -EIO;

		gdp = ext3_get_group_desc(sb, group, &bh2);
		if (!gdp)
			goto fail;

		brelse(bitmap_bh);
		bitmap_bh = read_inode_bitmap(sb, group);
		if (!bitmap_bh)
			goto fail;

		ino = 0;

repeat_in_this_group:
		ino = ext3_find_next_zero_bit((unsigned long *)
				bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
		if (ino < EXT3_INODES_PER_GROUP(sb)) {

			BUFFER_TRACE(bitmap_bh, "get_write_access");
			err = ext3_journal_get_write_access(handle, bitmap_bh);
			if (err)
				goto fail;

			if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
						ino, bitmap_bh->b_data)) {
				/* we won it */
				BUFFER_TRACE(bitmap_bh,
					"call ext3_journal_dirty_metadata");
				err = ext3_journal_dirty_metadata(handle,
								bitmap_bh);
				if (err)
					goto fail;
				goto got;
			}
			/* we lost it */
			journal_release_buffer(handle, bitmap_bh);

			if (++ino < EXT3_INODES_PER_GROUP(sb))
				goto repeat_in_this_group;
		}

		/*
		 * This case is possible in concurrent environment.  It is very
		 * rare.  We cannot repeat the find_group_xxx() call because
		 * that will simply return the same blockgroup, because the
		 * group descriptor metadata has not yet been updated.
		 * So we just go onto the next blockgroup.
		 */
		if (++group == sbi->s_groups_count)
			group = 0;
	}
	err = -ENOSPC;
	goto out;

got:
	ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
	if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_new_inode",
			    "reserved inode or inode > inodes count - "
			    "block_group = %d, inode=%lu", group, ino);
		err = -EIO;
		goto fail;
	}

	BUFFER_TRACE(bh2, "get_write_access");
	err = ext3_journal_get_write_access(handle, bh2);
	if (err) goto fail;
	spin_lock(sb_bgl_lock(sbi, group));
	le16_add_cpu(&gdp->bg_free_inodes_count, -1);
	if (S_ISDIR(mode)) {
		le16_add_cpu(&gdp->bg_used_dirs_count, 1);
	}
	spin_unlock(sb_bgl_lock(sbi, group));
	BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bh2);
	if (err) goto fail;

	percpu_counter_dec(&sbi->s_freeinodes_counter);
	if (S_ISDIR(mode))
		percpu_counter_inc(&sbi->s_dirs_counter);


	if (test_opt(sb, GRPID)) {
		inode->i_mode = mode;
		inode->i_uid = current_fsuid();
		inode->i_gid = dir->i_gid;
	} else
		inode_init_owner(inode, dir, mode);

	inode->i_ino = ino;
	/* This is the optimal IO size (for stat), not the fs block size */
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;

	memset(ei->i_data, 0, sizeof(ei->i_data));
	ei->i_dir_start_lookup = 0;
	ei->i_disksize = 0;

	ei->i_flags =
		ext3_mask_flags(mode, EXT3_I(dir)->i_flags & EXT3_FL_INHERITED);
#ifdef EXT3_FRAGMENTS
	ei->i_faddr = 0;
	ei->i_frag_no = 0;
	ei->i_frag_size = 0;
#endif
	ei->i_file_acl = 0;
	ei->i_dir_acl = 0;
	ei->i_dtime = 0;
	ei->i_block_alloc_info = NULL;
	ei->i_block_group = group;

	ext3_set_inode_flags(inode);
	if (IS_DIRSYNC(inode))
		handle->h_sync = 1;
	if (insert_inode_locked(inode) < 0) {
		/*
		 * Likely a bitmap corruption causing inode to be allocated
		 * twice.
		 */
		err = -EIO;
		goto fail;
	}
	spin_lock(&sbi->s_next_gen_lock);
	inode->i_generation = sbi->s_next_generation++;
	spin_unlock(&sbi->s_next_gen_lock);

	ei->i_state_flags = 0;
	ext3_set_inode_state(inode, EXT3_STATE_NEW);

	/* See comment in ext3_iget for explanation */
	if (ino >= EXT3_FIRST_INO(sb) + 1 &&
	    EXT3_INODE_SIZE(sb) > EXT3_GOOD_OLD_INODE_SIZE) {
		ei->i_extra_isize =
			sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE;
	} else {
		ei->i_extra_isize = 0;
	}

	ret = inode;
	dquot_initialize(inode);
	err = dquot_alloc_inode(inode);
	if (err)
		goto fail_drop;

	err = ext3_init_acl(handle, inode, dir);
	if (err)
		goto fail_free_drop;

	err = ext3_init_security(handle, inode, dir, qstr);
	if (err)
		goto fail_free_drop;

	err = ext3_mark_inode_dirty(handle, inode);
	if (err) {
		ext3_std_error(sb, err);
		goto fail_free_drop;
	}

	ext3_debug("allocating inode %lu\n", inode->i_ino);
	trace_ext3_allocate_inode(inode, dir, mode);
	goto really_out;
fail:
	ext3_std_error(sb, err);
out:
	iput(inode);
	ret = ERR_PTR(err);
really_out:
	brelse(bitmap_bh);
	return ret;

fail_free_drop:
	dquot_free_inode(inode);

fail_drop:
	dquot_drop(inode);
	inode->i_flags |= S_NOQUOTA;
	inode->i_nlink = 0;
	unlock_new_inode(inode);
	iput(inode);
	brelse(bitmap_bh);
	return ERR_PTR(err);
}
예제 #2
0
/*
 * NOTE! When we get the inode, we're the only people
 * that have access to it, and as such there are no
 * race conditions we have to worry about. The inode
 * is not on the hash-lists, and it cannot be reached
 * through the filesystem because the directory entry
 * has been deleted earlier.
 *
 * HOWEVER: we must make sure that we get no aliases,
 * which means that we have to call "clear_inode()"
 * _before_ we mark the inode not in use in the inode
 * bitmaps. Otherwise a newly created file might use
 * the same inode number (not actually the same pointer
 * though), and then we'd have two inodes sharing the
 * same inode number and space on the harddisk.
 */
void ext3_free_inode (handle_t *handle, struct inode * inode)
{
	struct super_block * sb = inode->i_sb;
	int is_directory;
	unsigned long ino;
	struct buffer_head *bitmap_bh = NULL;
	struct buffer_head *bh2;
	unsigned long block_group;
	unsigned long bit;
	struct ext3_group_desc * gdp;
	struct ext3_super_block * es;
	struct ext3_sb_info *sbi;
	int fatal = 0, err;

	if (atomic_read(&inode->i_count) > 1) {
		printk ("ext3_free_inode: inode has count=%d\n",
					atomic_read(&inode->i_count));
		return;
	}
	if (inode->i_nlink) {
		printk ("ext3_free_inode: inode has nlink=%d\n",
			inode->i_nlink);
		return;
	}
	if (!sb) {
		printk("ext3_free_inode: inode on nonexistent device\n");
		return;
	}
	sbi = EXT3_SB(sb);

	ino = inode->i_ino;
	ext3_debug ("freeing inode %lu\n", ino);

	is_directory = S_ISDIR(inode->i_mode);

	es = EXT3_SB(sb)->s_es;
	if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_free_inode",
			    "reserved or nonexistent inode %lu", ino);
		goto error_return;
	}
	block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
	bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
	bitmap_bh = read_inode_bitmap(sb, block_group);
	if (!bitmap_bh)
		goto error_return;

	BUFFER_TRACE(bitmap_bh, "get_write_access");
	fatal = ext3_journal_get_write_access(handle, bitmap_bh);
	if (fatal)
		goto error_return;

	/* Ok, now we can actually update the inode bitmaps.. */
	if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
					bit, bitmap_bh->b_data))
		ext3_error (sb, "ext3_free_inode",
			      "bit already cleared for inode %lu", ino);
	else {
		gdp = ext3_get_group_desc (sb, block_group, &bh2);

		BUFFER_TRACE(bh2, "get_write_access");
		fatal = ext3_journal_get_write_access(handle, bh2);
		if (fatal) goto error_return;

		if (gdp) {
			spin_lock(sb_bgl_lock(sbi, block_group));
			le16_add_cpu(&gdp->bg_free_inodes_count, 1);
			if (is_directory)
				le16_add_cpu(&gdp->bg_used_dirs_count, -1);
			spin_unlock(sb_bgl_lock(sbi, block_group));
			percpu_counter_inc(&sbi->s_freeinodes_counter);
			if (is_directory)
				percpu_counter_dec(&sbi->s_dirs_counter);

		}
		BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
		err = ext3_journal_dirty_metadata(handle, bh2);
		if (!fatal) fatal = err;
	}
	BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bitmap_bh);
	if (!fatal)
		fatal = err;

error_return:
	brelse(bitmap_bh);
	ext3_std_error(sb, fatal);
}
예제 #3
0
static int find_group_orlov(struct super_block *sb, struct inode *parent)
{
	int parent_group = EXT3_I(parent)->i_block_group;
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	struct ext3_super_block *es = sbi->s_es;
	int ngroups = sbi->s_groups_count;
	int inodes_per_group = EXT3_INODES_PER_GROUP(sb);
	unsigned int freei, avefreei;
	ext3_fsblk_t freeb, avefreeb;
	ext3_fsblk_t blocks_per_dir;
	unsigned int ndirs;
	int max_debt, max_dirs, min_inodes;
	ext3_grpblk_t min_blocks;
	int group = -1, i;
	struct ext3_group_desc *desc;

	freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
	avefreei = freei / ngroups;
	freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
	avefreeb = freeb / ngroups;
	ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);

	if ((parent == sb->s_root->d_inode) ||
	    (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) {
		int best_ndir = inodes_per_group;
		int best_group = -1;

		get_random_bytes(&group, sizeof(group));
		parent_group = (unsigned)group % ngroups;
		for (i = 0; i < ngroups; i++) {
			group = (parent_group + i) % ngroups;
			desc = ext3_get_group_desc (sb, group, NULL);
			if (!desc || !desc->bg_free_inodes_count)
				continue;
			if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
				continue;
			if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
				continue;
			if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
				continue;
			best_group = group;
			best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
		}
		if (best_group >= 0)
			return best_group;
		goto fallback;
	}

	blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs;

	max_dirs = ndirs / ngroups + inodes_per_group / 16;
	min_inodes = avefreei - inodes_per_group / 4;
	min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4;

	max_debt = EXT3_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, (ext3_fsblk_t)BLOCK_COST);
	if (max_debt * INODE_COST > inodes_per_group)
		max_debt = inodes_per_group / INODE_COST;
	if (max_debt > 255)
		max_debt = 255;
	if (max_debt == 0)
		max_debt = 1;

	for (i = 0; i < ngroups; i++) {
		group = (parent_group + i) % ngroups;
		desc = ext3_get_group_desc (sb, group, NULL);
		if (!desc || !desc->bg_free_inodes_count)
			continue;
		if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
			continue;
		if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
			continue;
		if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
			continue;
		return group;
	}

fallback:
	for (i = 0; i < ngroups; i++) {
		group = (parent_group + i) % ngroups;
		desc = ext3_get_group_desc (sb, group, NULL);
		if (!desc || !desc->bg_free_inodes_count)
			continue;
		if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
			return group;
	}

	if (avefreei) {
		/*
		 * The free-inodes counter is approximate, and for really small
		 * filesystems the above test can fail to find any blockgroups
		 */
		avefreei = 0;
		goto fallback;
	}

	return -1;
}
예제 #4
0
/* Verify that we are loading a valid orphan from disk */
struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
{
	unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count);
	unsigned long block_group;
	int bit;
	struct buffer_head *bitmap_bh;
	struct inode *inode = NULL;
	long err = -EIO;

	/* Error cases - e2fsck has already cleaned up for us */
	if (ino > max_ino) {
		ext3_warning(sb, __func__,
			     "bad orphan ino %lu!  e2fsck was run?", ino);
		goto error;
	}

	block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
	bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
	bitmap_bh = read_inode_bitmap(sb, block_group);
	if (!bitmap_bh) {
		ext3_warning(sb, __func__,
			     "inode bitmap error for orphan %lu", ino);
		goto error;
	}

	/* Having the inode bit set should be a 100% indicator that this
	 * is a valid orphan (no e2fsck run on fs).  Orphans also include
	 * inodes that were being truncated, so we can't check i_nlink==0.
	 */
	if (!ext3_test_bit(bit, bitmap_bh->b_data))
		goto bad_orphan;

	inode = ext3_iget(sb, ino);
	if (IS_ERR(inode))
		goto iget_failed;

	/*
	 * If the orphans has i_nlinks > 0 then it should be able to be
	 * truncated, otherwise it won't be removed from the orphan list
	 * during processing and an infinite loop will result.
	 */
	if (inode->i_nlink && !ext3_can_truncate(inode))
		goto bad_orphan;

	if (NEXT_ORPHAN(inode) > max_ino)
		goto bad_orphan;
	brelse(bitmap_bh);
	return inode;

iget_failed:
	err = PTR_ERR(inode);
	inode = NULL;
bad_orphan:
	ext3_warning(sb, __func__,
		     "bad orphan inode %lu!  e2fsck was run?", ino);
	printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n",
	       bit, (unsigned long long)bitmap_bh->b_blocknr,
	       ext3_test_bit(bit, bitmap_bh->b_data));
	printk(KERN_NOTICE "inode=%p\n", inode);
	if (inode) {
		printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
		       is_bad_inode(inode));
		printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
		       NEXT_ORPHAN(inode));
		printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
		printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink);
		/* Avoid freeing blocks if we got a bad deleted inode */
		if (inode->i_nlink == 0)
			inode->i_blocks = 0;
		iput(inode);
	}
	brelse(bitmap_bh);
error:
	return ERR_PTR(err);
}
예제 #5
0
int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
		unsigned long arg)
{
	struct ext3_inode_info *ei = EXT3_I(inode);
	unsigned int flags;
	unsigned short rsv_window_size;

	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);

	switch (cmd) {
	case EXT3_IOC_GETFLAGS:
		ext3_get_inode_flags(ei);
		flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case EXT3_IOC_SETFLAGS: {
		handle_t *handle = NULL;
		int err;
		struct ext3_iloc iloc;
		unsigned int oldflags;
		unsigned int jflag;

		if (IS_RDONLY(inode))
			return -EROFS;

		if (!is_owner_or_cap(inode))
			return -EACCES;

		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		if (!S_ISDIR(inode->i_mode))
			flags &= ~EXT3_DIRSYNC_FL;

		mutex_lock(&inode->i_mutex);
		/* Is it quota file? Do not allow user to mess with it */
		if (IS_NOQUOTA(inode)) {
			mutex_unlock(&inode->i_mutex);
			return -EPERM;
		}
		oldflags = ei->i_flags;

		/* The JOURNAL_DATA flag is modifiable only by root */
		jflag = flags & EXT3_JOURNAL_DATA_FL;

		/*
		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
		 * the relevant capability.
		 *
		 * This test looks nicer. Thanks to Pauline Middelink
		 */
		if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE)) {
				mutex_unlock(&inode->i_mutex);
				return -EPERM;
			}
		}

		/*
		 * The JOURNAL_DATA flag can only be changed by
		 * the relevant capability.
		 */
		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
			if (!capable(CAP_SYS_RESOURCE)) {
				mutex_unlock(&inode->i_mutex);
				return -EPERM;
			}
		}


		handle = ext3_journal_start(inode, 1);
		if (IS_ERR(handle)) {
			mutex_unlock(&inode->i_mutex);
			return PTR_ERR(handle);
		}
		if (IS_SYNC(inode))
			handle->h_sync = 1;
		err = ext3_reserve_inode_write(handle, inode, &iloc);
		if (err)
			goto flags_err;

		flags = flags & EXT3_FL_USER_MODIFIABLE;
		flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
		ei->i_flags = flags;

		ext3_set_inode_flags(inode);
		inode->i_ctime = CURRENT_TIME_SEC;

		err = ext3_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
		ext3_journal_stop(handle);
		if (err) {
			mutex_unlock(&inode->i_mutex);
			return err;
		}

		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
			err = ext3_change_inode_journal_flag(inode, jflag);
		mutex_unlock(&inode->i_mutex);
		return err;
	}
	case EXT3_IOC_GETVERSION:
	case EXT3_IOC_GETVERSION_OLD:
		return put_user(inode->i_generation, (int __user *) arg);
	case EXT3_IOC_SETVERSION:
	case EXT3_IOC_SETVERSION_OLD: {
		handle_t *handle;
		struct ext3_iloc iloc;
		__u32 generation;
		int err;

		if (!is_owner_or_cap(inode))
			return -EPERM;
		if (IS_RDONLY(inode))
			return -EROFS;
		if (get_user(generation, (int __user *) arg))
			return -EFAULT;

		handle = ext3_journal_start(inode, 1);
		if (IS_ERR(handle))
			return PTR_ERR(handle);
		err = ext3_reserve_inode_write(handle, inode, &iloc);
		if (err == 0) {
			inode->i_ctime = CURRENT_TIME_SEC;
			inode->i_generation = generation;
			err = ext3_mark_iloc_dirty(handle, inode, &iloc);
		}
		ext3_journal_stop(handle);
		return err;
	}
#ifdef CONFIG_JBD_DEBUG
	case EXT3_IOC_WAIT_FOR_READONLY:
		/*
		 * This is racy - by the time we're woken up and running,
		 * the superblock could be released.  And the module could
		 * have been unloaded.  So sue me.
		 *
		 * Returns 1 if it slept, else zero.
		 */
		{
			struct super_block *sb = inode->i_sb;
			DECLARE_WAITQUEUE(wait, current);
			int ret = 0;

			set_current_state(TASK_INTERRUPTIBLE);
			add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
			if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
				schedule();
				ret = 1;
			}
			remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
			return ret;
		}
#endif
	case EXT3_IOC_GETRSVSZ:
		if (test_opt(inode->i_sb, RESERVATION)
			&& S_ISREG(inode->i_mode)
			&& ei->i_block_alloc_info) {
			rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
			return put_user(rsv_window_size, (int __user *)arg);
		}
		return -ENOTTY;
	case EXT3_IOC_SETRSVSZ: {

		if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
			return -ENOTTY;

		if (IS_RDONLY(inode))
			return -EROFS;

		if (!is_owner_or_cap(inode))
			return -EACCES;

		if (get_user(rsv_window_size, (int __user *)arg))
			return -EFAULT;

		if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
			rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;

		/*
		 * need to allocate reservation structure for this inode
		 * before set the window size
		 */
		mutex_lock(&ei->truncate_mutex);
		if (!ei->i_block_alloc_info)
			ext3_init_block_alloc_info(inode);

		if (ei->i_block_alloc_info){
			struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
			rsv->rsv_goal_size = rsv_window_size;
		}
		mutex_unlock(&ei->truncate_mutex);
		return 0;
	}
	case EXT3_IOC_GROUP_EXTEND: {
		ext3_fsblk_t n_blocks_count;
		struct super_block *sb = inode->i_sb;
		int err;

		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (IS_RDONLY(inode))
			return -EROFS;

		if (get_user(n_blocks_count, (__u32 __user *)arg))
			return -EFAULT;

		err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
		journal_lock_updates(EXT3_SB(sb)->s_journal);
		journal_flush(EXT3_SB(sb)->s_journal);
		journal_unlock_updates(EXT3_SB(sb)->s_journal);

		return err;
	}
	case EXT3_IOC_GROUP_ADD: {
		struct ext3_new_group_data input;
		struct super_block *sb = inode->i_sb;
		int err;

		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (IS_RDONLY(inode))
			return -EROFS;

		if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
				sizeof(input)))
			return -EFAULT;

		err = ext3_group_add(sb, &input);
		journal_lock_updates(EXT3_SB(sb)->s_journal);
		journal_flush(EXT3_SB(sb)->s_journal);
		journal_unlock_updates(EXT3_SB(sb)->s_journal);

		return err;
	}


	default:
		return -ENOTTY;
	}
}
예제 #6
0
/*
 * There are two policies for allocating an inode.  If the new inode is
 * a directory, then a forward search is made for a block group with both
 * free space and a low directory-to-inode ratio; if that fails, then of
 * the groups with above-average free space, that group with the fewest
 * directories already is chosen.
 *
 * For other inodes, search forward from the parent directory's block
 * group to find a free inode.
 */
struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
{
	struct super_block *sb;
	struct buffer_head *bitmap_bh = NULL;
	struct buffer_head *bh2;
	int group;
	unsigned long ino = 0;
	struct inode * inode;
	struct ext3_group_desc * gdp = NULL;
	struct ext3_super_block * es;
	struct ext3_inode_info *ei;
	struct ext3_sb_info *sbi;
	int err = 0;
	struct inode *ret;
	int i;

	/* Cannot create files in a deleted directory */
	if (!dir || !dir->i_nlink)
		return ERR_PTR(-EPERM);

	sb = dir->i_sb;
	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	ei = EXT3_I(inode);

	sbi = EXT3_SB(sb);
	es = sbi->s_es;
	if (S_ISDIR(mode)) {
		if (test_opt (sb, OLDALLOC))
			group = find_group_dir(sb, dir);
		else
			group = find_group_orlov(sb, dir);
	} else 
		group = find_group_other(sb, dir);

	err = -ENOSPC;
	if (group == -1)
		goto out;

	for (i = 0; i < sbi->s_groups_count; i++) {
		gdp = ext3_get_group_desc(sb, group, &bh2);

		err = -EIO;
		brelse(bitmap_bh);
		bitmap_bh = read_inode_bitmap(sb, group);
		if (!bitmap_bh)
			goto fail;

		ino = 0;

repeat_in_this_group:
		ino = ext3_find_next_zero_bit((unsigned long *)
				bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
		if (ino < EXT3_INODES_PER_GROUP(sb)) {
			int credits = 0;

			BUFFER_TRACE(bitmap_bh, "get_write_access");
			err = ext3_journal_get_write_access_credits(handle,
							bitmap_bh, &credits);
			if (err)
				goto fail;

			if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
						ino, bitmap_bh->b_data)) {
				/* we won it */
				BUFFER_TRACE(bitmap_bh,
					"call ext3_journal_dirty_metadata");
				err = ext3_journal_dirty_metadata(handle,
								bitmap_bh);
				if (err)
					goto fail;
				goto got;
			}
			/* we lost it */
			journal_release_buffer(handle, bitmap_bh, credits);

			if (++ino < EXT3_INODES_PER_GROUP(sb))
				goto repeat_in_this_group;
		}

		/*
		 * This case is possible in concurrent environment.  It is very
		 * rare.  We cannot repeat the find_group_xxx() call because
		 * that will simply return the same blockgroup, because the
		 * group descriptor metadata has not yet been updated.
		 * So we just go onto the next blockgroup.
		 */
		if (++group == sbi->s_groups_count)
			group = 0;
	}
	err = -ENOSPC;
	goto out;

got:
	ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
	if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_new_inode",
			    "reserved inode or inode > inodes count - "
			    "block_group = %d, inode=%lu", group, ino);
		err = -EIO;
		goto fail;
	}

	BUFFER_TRACE(bh2, "get_write_access");
	err = ext3_journal_get_write_access(handle, bh2);
	if (err) goto fail;
	spin_lock(sb_bgl_lock(sbi, group));
	gdp->bg_free_inodes_count =
		cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
	if (S_ISDIR(mode)) {
		gdp->bg_used_dirs_count =
			cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
	}
	spin_unlock(sb_bgl_lock(sbi, group));
	BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bh2);
	if (err) goto fail;

	percpu_counter_dec(&sbi->s_freeinodes_counter);
	if (S_ISDIR(mode))
		percpu_counter_inc(&sbi->s_dirs_counter);
	sb->s_dirt = 1;

	inode->i_uid = current->fsuid;
	if (test_opt (sb, GRPID))
		inode->i_gid = dir->i_gid;
	else if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else
		inode->i_gid = current->fsgid;
	inode->i_mode = mode;

	inode->i_ino = ino;
	/* This is the optimal IO size (for stat), not the fs block size */
	inode->i_blksize = PAGE_SIZE;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;

	memset(ei->i_data, 0, sizeof(ei->i_data));
	ei->i_next_alloc_block = 0;
	ei->i_next_alloc_goal = 0;
	ei->i_dir_start_lookup = 0;
	ei->i_disksize = 0;

	ei->i_flags = EXT3_I(dir)->i_flags & ~EXT3_INDEX_FL;
	if (S_ISLNK(mode))
		ei->i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL);
	/* dirsync only applies to directories */
	if (!S_ISDIR(mode))
		ei->i_flags &= ~EXT3_DIRSYNC_FL;
#ifdef EXT3_FRAGMENTS
	ei->i_faddr = 0;
	ei->i_frag_no = 0;
	ei->i_frag_size = 0;
#endif
	ei->i_file_acl = 0;
	ei->i_dir_acl = 0;
	ei->i_dtime = 0;
	ei->i_rsv_window.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
	ei->i_rsv_window.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
	atomic_set(&ei->i_rsv_window.rsv_goal_size, EXT3_DEFAULT_RESERVE_BLOCKS);
	atomic_set(&ei->i_rsv_window.rsv_alloc_hit, 0);
	seqlock_init(&ei->i_rsv_window.rsv_seqlock);
	ei->i_block_group = group;

	ext3_set_inode_flags(inode);
	if (IS_DIRSYNC(inode))
		handle->h_sync = 1;
	insert_inode_hash(inode);
	spin_lock(&sbi->s_next_gen_lock);
	inode->i_generation = sbi->s_next_generation++;
	spin_unlock(&sbi->s_next_gen_lock);

	ei->i_state = EXT3_STATE_NEW;

	ret = inode;
	if(DQUOT_ALLOC_INODE(inode)) {
		DQUOT_DROP(inode);
		err = -EDQUOT;
		goto fail2;
	}
	err = ext3_init_acl(handle, inode, dir);
	if (err) {
		DQUOT_FREE_INODE(inode);
		goto fail2;
  	}
	err = ext3_mark_inode_dirty(handle, inode);
	if (err) {
		ext3_std_error(sb, err);
		DQUOT_FREE_INODE(inode);
		goto fail2;
	}

	ext3_debug("allocating inode %lu\n", inode->i_ino);
	goto really_out;
fail:
	ext3_std_error(sb, err);
out:
	iput(inode);
	ret = ERR_PTR(err);
really_out:
	brelse(bitmap_bh);
	return ret;

fail2:
	inode->i_flags |= S_NOQUOTA;
	inode->i_nlink = 0;
	iput(inode);
	brelse(bitmap_bh);
	return ERR_PTR(err);
}
예제 #7
0
/*
 * Called at inode eviction from icache
 */
void ext3_evict_inode (struct inode *inode)
{
	struct ext3_inode_info *ei = EXT3_I(inode);
	struct ext3_block_alloc_info *rsv;
	handle_t *handle;
	int want_delete = 0;

	trace_ext3_evict_inode(inode);
	if (!inode->i_nlink && !is_bad_inode(inode)) {
		dquot_initialize(inode);
		want_delete = 1;
	}

	/*
	 * When journalling data dirty buffers are tracked only in the journal.
	 * So although mm thinks everything is clean and ready for reaping the
	 * inode might still have some pages to write in the running
	 * transaction or waiting to be checkpointed. Thus calling
	 * journal_invalidatepage() (via truncate_inode_pages()) to discard
	 * these buffers can cause data loss. Also even if we did not discard
	 * these buffers, we would have no way to find them after the inode
	 * is reaped and thus user could see stale data if he tries to read
	 * them before the transaction is checkpointed. So be careful and
	 * force everything to disk here... We use ei->i_datasync_tid to
	 * store the newest transaction containing inode's data.
	 *
	 * Note that directories do not have this problem because they don't
	 * use page cache.
	 *
	 * The s_journal check handles the case when ext3_get_journal() fails
	 * and puts the journal inode.
	 */
	if (inode->i_nlink && ext3_should_journal_data(inode) &&
	    EXT3_SB(inode->i_sb)->s_journal &&
	    (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode)) &&
	    inode->i_ino != EXT3_JOURNAL_INO) {
		tid_t commit_tid = atomic_read(&ei->i_datasync_tid);
		journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;

		log_start_commit(journal, commit_tid);
		log_wait_commit(journal, commit_tid);
		filemap_write_and_wait(&inode->i_data);
	}
	truncate_inode_pages(&inode->i_data, 0);

	ext3_discard_reservation(inode);
	rsv = ei->i_block_alloc_info;
	ei->i_block_alloc_info = NULL;
	if (unlikely(rsv))
		kfree(rsv);

	if (!want_delete)
		goto no_delete;

	handle = start_transaction(inode);
	if (IS_ERR(handle)) {
		/*
		 * If we're going to skip the normal cleanup, we still need to
		 * make sure that the in-core orphan linked list is properly
		 * cleaned up.
		 */
		ext3_orphan_del(NULL, inode);
		goto no_delete;
	}

	if (IS_SYNC(inode))
		handle->h_sync = 1;
	inode->i_size = 0;
	if (inode->i_blocks)
		ext3_truncate(inode);
	/*
	 * Kill off the orphan record created when the inode lost the last
	 * link.  Note that ext3_orphan_del() has to be able to cope with the
	 * deletion of a non-existent orphan - ext3_truncate() could
	 * have removed the record.
	 */
	ext3_orphan_del(handle, inode);
	ei->i_dtime = get_seconds();

	/*
	 * One subtle ordering requirement: if anything has gone wrong
	 * (transaction abort, IO errors, whatever), then we can still
	 * do these next steps (the fs will already have been marked as
	 * having errors), but we can't free the inode if the mark_dirty
	 * fails.
	 */
	if (ext3_mark_inode_dirty(handle, inode)) {
		/* If that failed, just dquot_drop() and be done with that */
		dquot_drop(inode);
		clear_inode(inode);
	} else {
		ext3_xattr_delete_inode(handle, inode);
		dquot_free_inode(inode);
		dquot_drop(inode);
		clear_inode(inode);
		ext3_free_inode(handle, inode);
	}
	ext3_journal_stop(handle);
	return;
no_delete:
	clear_inode(inode);
	dquot_drop(inode);
}
예제 #8
0
파일: fsync.c 프로젝트: Terune/Os
int ext3_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
    struct timespec before,after;
    printk(KERN_DEBUG"fsync start\n");
    getnstimeofday(&before);

	struct inode *inode = file->f_mapping->host;
	struct ext3_inode_info *ei = EXT3_I(inode);
	journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;
	int ret, needs_barrier = 0;
	tid_t commit_tid;

	trace_ext3_sync_file_enter(file, datasync);

	if (inode->i_sb->s_flags & MS_RDONLY) {
		/* Make sure that we read updated state */
		smp_rmb();
		if (EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)
        {
            getnstimeofday(&after);
            printk(KERN_DEBUG"fsync time:%.01f us",after.tv_nsec-before.tv_nsec);
            return -EROFS;
        }
            getnstimeofday(&after);
            printk(KERN_DEBUG"fsync time:%.01f us",after.tv_nsec-before.tv_nsec);
            return 0;
	}
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret)
		goto out;

	J_ASSERT(ext3_journal_current_handle() == NULL);

	/*
	 * data=writeback,ordered:
	 *  The caller's filemap_fdatawrite()/wait will sync the data.
	 *  Metadata is in the journal, we wait for a proper transaction
	 *  to commit here.
	 *
	 * data=journal:
	 *  filemap_fdatawrite won't do anything (the buffers are clean).
	 *  ext3_force_commit will write the file data into the journal and
	 *  will wait on that.
	 *  filemap_fdatawait() will encounter a ton of newly-dirtied pages
	 *  (they were dirtied by commit).  But that's OK - the blocks are
	 *  safe in-journal, which is all fsync() needs to ensure.
	 */
	if (ext3_should_journal_data(inode)) {
		ret = ext3_force_commit(inode->i_sb);
		goto out;
	}

	if (datasync)
		commit_tid = atomic_read(&ei->i_datasync_tid);
	else
		commit_tid = atomic_read(&ei->i_sync_tid);

	if (test_opt(inode->i_sb, BARRIER) &&
	    !journal_trans_will_send_data_barrier(journal, commit_tid))
		needs_barrier = 1;
	log_start_commit(journal, commit_tid);
	ret = log_wait_commit(journal, commit_tid);

	/*
	 * In case we didn't commit a transaction, we have to flush
	 * disk caches manually so that data really is on persistent
	 * storage
	 */
	if (needs_barrier) {
		int err;

		err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
	}
out:
    getnstimeofday(&after);
    printk(KERN_DEBUG"fsync time:%.01f us",after.tv_nsec-before.tv_nsec);
    trace_ext3_sync_file_exit(inode, ret);
	return ret;
}