static inline int
nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
				     int create, struct buffer_head **bhp)
{
	return nilfs_mdt_get_block(sufile,
				   nilfs_sufile_get_blkoff(sufile, segnum),
				   create, NULL, bhp);
}
static int nilfs_sufile_delete_segment_usage_block(struct inode *sufile,
						   __u64 segnum)
{
	return nilfs_mdt_delete_block(sufile,
				      nilfs_sufile_get_blkoff(sufile, segnum));
}
int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
			 int create, size_t *ndone,
			 void (*dofunc)(struct inode *, __u64,
					struct buffer_head *,
					struct buffer_head *))
{
	struct buffer_head *header_bh, *bh;
	unsigned long blkoff, prev_blkoff;
	__u64 *seg;
	size_t nerr = 0, n = 0;
	int ret = 0;

	if (unlikely(nsegs == 0))
		goto out;

	down_write(&NILFS_MDT(sufile)->mi_sem);
	for (seg = segnumv; seg < segnumv + nsegs; seg++) {
		if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) {
			printk(KERN_WARNING
			       "%s: invalid segment number: %llu\n", __func__,
			       (unsigned long long)*seg);
			nerr++;
		}
	}
	if (nerr > 0) {
		ret = -EINVAL;
		goto out_sem;
	}

	ret = nilfs_sufile_get_header_block(sufile, &header_bh);
	if (ret < 0)
		goto out_sem;

	seg = segnumv;
	blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
	ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
	if (ret < 0)
		goto out_header;

	for (;;) {
		dofunc(sufile, *seg, header_bh, bh);

		if (++seg >= segnumv + nsegs)
			break;
		prev_blkoff = blkoff;
		blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
		if (blkoff == prev_blkoff)
			continue;

		
		brelse(bh);
		ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
		if (unlikely(ret < 0))
			goto out_header;
	}
	brelse(bh);

 out_header:
	n = seg - segnumv;
	brelse(header_bh);
 out_sem:
	up_write(&NILFS_MDT(sufile)->mi_sem);
 out:
	if (ndone)
		*ndone = n;
	return ret;
}
Beispiel #4
0
/**
 * nilfs_sufile_set_suinfo - sets segment usage info
 * @sufile: inode of segment usage file
 * @buf: array of suinfo_update
 * @supsz: byte size of suinfo_update
 * @nsup: size of suinfo_update array
 *
 * Description: Takes an array of nilfs_suinfo_update structs and updates
 * segment usage accordingly. Only the fields indicated by the sup_flags
 * are updated.
 *
 * Return Value: On success, 0 is returned. On error, one of the
 * following negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
 */
ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
				unsigned int supsz, size_t nsup)
{
	struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
	struct buffer_head *header_bh, *bh;
	struct nilfs_suinfo_update *sup, *supend = buf + supsz * nsup;
	struct nilfs_segment_usage *su;
	void *kaddr;
	unsigned long blkoff, prev_blkoff;
	int cleansi, cleansu, dirtysi, dirtysu;
	long ncleaned = 0, ndirtied = 0;
	int ret = 0;

	if (unlikely(nsup == 0))
		return ret;

	for (sup = buf; sup < supend; sup = (void *)sup + supsz) {
		if (sup->sup_segnum >= nilfs->ns_nsegments
			|| (sup->sup_flags &
				(~0UL << __NR_NILFS_SUINFO_UPDATE_FIELDS))
			|| (nilfs_suinfo_update_nblocks(sup) &&
				sup->sup_sui.sui_nblocks >
				nilfs->ns_blocks_per_segment))
			return -EINVAL;
	}

	down_write(&NILFS_MDT(sufile)->mi_sem);

	ret = nilfs_sufile_get_header_block(sufile, &header_bh);
	if (ret < 0)
		goto out_sem;

	sup = buf;
	blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
	ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
	if (ret < 0)
		goto out_header;

	for (;;) {
		kaddr = kmap_atomic(bh->b_page, KM_USER0);
		su = nilfs_sufile_block_get_segment_usage(
			sufile, sup->sup_segnum, bh, kaddr);

		if (nilfs_suinfo_update_lastmod(sup))
			su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod);

		if (nilfs_suinfo_update_nblocks(sup))
			su->su_nblocks = cpu_to_le32(sup->sup_sui.sui_nblocks);

		if (nilfs_suinfo_update_flags(sup)) {
			/*
			 * Active flag is a virtual flag projected by running
			 * nilfs kernel code - drop it not to write it to
			 * disk.
			 */
			sup->sup_sui.sui_flags &=
					~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);

			cleansi = nilfs_suinfo_clean(&sup->sup_sui);
			cleansu = nilfs_segment_usage_clean(su);
			dirtysi = nilfs_suinfo_dirty(&sup->sup_sui);
			dirtysu = nilfs_segment_usage_dirty(su);

			if (cleansi && !cleansu)
				++ncleaned;
			else if (!cleansi && cleansu)
				--ncleaned;

			if (dirtysi && !dirtysu)
				++ndirtied;
			else if (!dirtysi && dirtysu)
				--ndirtied;

			su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags);
		}

		kunmap_atomic(kaddr, KM_USER0);

		sup = (void *)sup + supsz;
		if (sup >= supend)
			break;

		prev_blkoff = blkoff;
		blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
		if (blkoff == prev_blkoff)
			continue;

		/* get different block */
		mark_buffer_dirty(bh);
		put_bh(bh);
		ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
		if (unlikely(ret < 0))
			goto out_mark;
	}
	mark_buffer_dirty(bh);
	put_bh(bh);

 out_mark:
	if (ncleaned || ndirtied) {
		nilfs_sufile_mod_counter(header_bh, (u64)ncleaned,
				(u64)ndirtied);
		NILFS_SUI(sufile)->ncleansegs += ncleaned;
	}
	nilfs_mdt_mark_dirty(sufile);
 out_header:
	put_bh(header_bh);
 out_sem:
	up_write(&NILFS_MDT(sufile)->mi_sem);
	return ret;
}