コード例 #1
0
ファイル: xfs_icache.c プロジェクト: DenisLug/mptcp
STATIC int
xfs_inode_free_eofblocks(
	struct xfs_inode	*ip,
	int			flags,
	void			*args)
{
	int ret;
	struct xfs_eofblocks *eofb = args;
	bool need_iolock = true;
	int match;

	ASSERT(!eofb || (eofb && eofb->eof_scan_owner != 0));

	if (!xfs_can_free_eofblocks(ip, false)) {
		/* inode could be preallocated or append-only */
		trace_xfs_inode_free_eofblocks_invalid(ip);
		xfs_inode_clear_eofblocks_tag(ip);
		return 0;
	}

	/*
	 * If the mapping is dirty the operation can block and wait for some
	 * time. Unless we are waiting, skip it.
	 */
	if (!(flags & SYNC_WAIT) &&
	    mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
		return 0;

	if (eofb) {
		if (eofb->eof_flags & XFS_EOF_FLAGS_UNION)
			match = xfs_inode_match_id_union(ip, eofb);
		else
			match = xfs_inode_match_id(ip, eofb);
		if (!match)
			return 0;

		/* skip the inode if the file size is too small */
		if (eofb->eof_flags & XFS_EOF_FLAGS_MINFILESIZE &&
		    XFS_ISIZE(ip) < eofb->eof_min_file_size)
			return 0;

		/*
		 * A scan owner implies we already hold the iolock. Skip it in
		 * xfs_free_eofblocks() to avoid deadlock. This also eliminates
		 * the possibility of EAGAIN being returned.
		 */
		if (eofb->eof_scan_owner == ip->i_ino)
			need_iolock = false;
	}

	ret = xfs_free_eofblocks(ip->i_mount, ip, need_iolock);

	/* don't revisit the inode if we're not waiting */
	if (ret == -EAGAIN && !(flags & SYNC_WAIT))
		ret = 0;

	return ret;
}
コード例 #2
0
ファイル: xfs_icache.c プロジェクト: BWhitten/linux-stable
STATIC int
xfs_inode_free_eofblocks(
	struct xfs_inode	*ip,
	int			flags,
	void			*args)
{
	int ret = 0;
	struct xfs_eofblocks *eofb = args;
	int match;

	if (!xfs_can_free_eofblocks(ip, false)) {
		/* inode could be preallocated or append-only */
		trace_xfs_inode_free_eofblocks_invalid(ip);
		xfs_inode_clear_eofblocks_tag(ip);
		return 0;
	}

	/*
	 * If the mapping is dirty the operation can block and wait for some
	 * time. Unless we are waiting, skip it.
	 */
	if (!(flags & SYNC_WAIT) &&
	    mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
		return 0;

	if (eofb) {
		if (eofb->eof_flags & XFS_EOF_FLAGS_UNION)
			match = xfs_inode_match_id_union(ip, eofb);
		else
			match = xfs_inode_match_id(ip, eofb);
		if (!match)
			return 0;

		/* skip the inode if the file size is too small */
		if (eofb->eof_flags & XFS_EOF_FLAGS_MINFILESIZE &&
		    XFS_ISIZE(ip) < eofb->eof_min_file_size)
			return 0;
	}

	/*
	 * If the caller is waiting, return -EAGAIN to keep the background
	 * scanner moving and revisit the inode in a subsequent pass.
	 */
	if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
		if (flags & SYNC_WAIT)
			ret = -EAGAIN;
		return ret;
	}
	ret = xfs_free_eofblocks(ip);
	xfs_iunlock(ip, XFS_IOLOCK_EXCL);

	return ret;
}
コード例 #3
0
STATIC int
xfs_inode_free_eofblocks(
	struct xfs_inode	*ip,
	struct xfs_perag	*pag,
	int			flags,
	void			*args)
{
	int ret;
	struct xfs_eofblocks *eofb = args;

	if (!xfs_can_free_eofblocks(ip, false)) {
		/* inode could be preallocated or append-only */
		trace_xfs_inode_free_eofblocks_invalid(ip);
		xfs_inode_clear_eofblocks_tag(ip);
		return 0;
	}

	/*
	 * If the mapping is dirty the operation can block and wait for some
	 * time. Unless we are waiting, skip it.
	 */
	if (!(flags & SYNC_WAIT) &&
	    mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
		return 0;

	if (eofb) {
		if (!xfs_inode_match_id(ip, eofb))
			return 0;

		/* skip the inode if the file size is too small */
		if (eofb->eof_flags & XFS_EOF_FLAGS_MINFILESIZE &&
		    XFS_ISIZE(ip) < eofb->eof_min_file_size)
			return 0;
	}

	ret = xfs_free_eofblocks(ip->i_mount, ip, true);

	/* don't revisit the inode if we're not waiting */
	if (ret == EAGAIN && !(flags & SYNC_WAIT))
		ret = 0;

	return ret;
}
コード例 #4
0
ファイル: xfs_reflink.c プロジェクト: val2k/linux
/*
 * Link a range of blocks from one file to another.
 */
int
xfs_reflink_remap_range(
	struct file		*file_in,
	loff_t			pos_in,
	struct file		*file_out,
	loff_t			pos_out,
	u64			len,
	bool			is_dedupe)
{
	struct inode		*inode_in = file_inode(file_in);
	struct xfs_inode	*src = XFS_I(inode_in);
	struct inode		*inode_out = file_inode(file_out);
	struct xfs_inode	*dest = XFS_I(inode_out);
	struct xfs_mount	*mp = src->i_mount;
	bool			same_inode = (inode_in == inode_out);
	xfs_fileoff_t		sfsbno, dfsbno;
	xfs_filblks_t		fsblen;
	xfs_extlen_t		cowextsize;
	ssize_t			ret;

	if (!xfs_sb_version_hasreflink(&mp->m_sb))
		return -EOPNOTSUPP;

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	/* Lock both files against IO */
	lock_two_nondirectories(inode_in, inode_out);
	if (same_inode)
		xfs_ilock(src, XFS_MMAPLOCK_EXCL);
	else
		xfs_lock_two_inodes(src, dest, XFS_MMAPLOCK_EXCL);

	/* Check file eligibility and prepare for block sharing. */
	ret = -EINVAL;
	/* Don't reflink realtime inodes */
	if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest))
		goto out_unlock;

	/* Don't share DAX file data for now. */
	if (IS_DAX(inode_in) || IS_DAX(inode_out))
		goto out_unlock;

	ret = vfs_clone_file_prep_inodes(inode_in, pos_in, inode_out, pos_out,
			&len, is_dedupe);
	if (ret <= 0)
		goto out_unlock;

	trace_xfs_reflink_remap_range(src, pos_in, len, dest, pos_out);

	/*
	 * Clear out post-eof preallocations because we don't have page cache
	 * backing the delayed allocations and they'll never get freed on
	 * their own.
	 */
	if (xfs_can_free_eofblocks(dest, true)) {
		ret = xfs_free_eofblocks(dest);
		if (ret)
			goto out_unlock;
	}

	/* Set flags and remap blocks. */
	ret = xfs_reflink_set_inode_flag(src, dest);
	if (ret)
		goto out_unlock;

	dfsbno = XFS_B_TO_FSBT(mp, pos_out);
	sfsbno = XFS_B_TO_FSBT(mp, pos_in);
	fsblen = XFS_B_TO_FSB(mp, len);
	ret = xfs_reflink_remap_blocks(src, sfsbno, dest, dfsbno, fsblen,
			pos_out + len);
	if (ret)
		goto out_unlock;

	/* Zap any page cache for the destination file's range. */
	truncate_inode_pages_range(&inode_out->i_data, pos_out,
				   PAGE_ALIGN(pos_out + len) - 1);

	/*
	 * Carry the cowextsize hint from src to dest if we're sharing the
	 * entire source file to the entire destination file, the source file
	 * has a cowextsize hint, and the destination file does not.
	 */
	cowextsize = 0;
	if (pos_in == 0 && len == i_size_read(inode_in) &&
	    (src->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) &&
	    pos_out == 0 && len >= i_size_read(inode_out) &&
	    !(dest->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE))
		cowextsize = src->i_d.di_cowextsize;

	ret = xfs_reflink_update_dest(dest, pos_out + len, cowextsize,
			is_dedupe);

out_unlock:
	xfs_iunlock(src, XFS_MMAPLOCK_EXCL);
	if (!same_inode)
		xfs_iunlock(dest, XFS_MMAPLOCK_EXCL);
	unlock_two_nondirectories(inode_in, inode_out);
	if (ret)
		trace_xfs_reflink_remap_range_error(dest, ret, _RET_IP_);
	return ret;
}