Example #1
0
STATIC int
xfs_iomap_eof_align_last_fsb(
	xfs_mount_t	*mp,
	xfs_iocore_t	*io,
	xfs_fsize_t	isize,
	xfs_extlen_t	extsize,
	xfs_fileoff_t	*last_fsb)
{
	xfs_fileoff_t	new_last_fsb = 0;
	xfs_extlen_t	align;
	int		eof, error;

	if (io->io_flags & XFS_IOCORE_RT)
		;
	/*
	 * If mounted with the "-o swalloc" option, roundup the allocation
	 * request to a stripe width boundary if the file size is >=
	 * stripe width and we are allocating past the allocation eof.
	 */
	else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&
	        (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)))
		new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);
	/*
	 * Roundup the allocation request to a stripe unit (m_dalign) boundary
	 * if the file size is >= stripe unit size, and we are allocating past
	 * the allocation eof.
	 */
	else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)))
		new_last_fsb = roundup_64(*last_fsb, mp->m_dalign);

	/*
	 * Always round up the allocation request to an extent boundary
	 * (when file on a real-time subvolume or has di_extsize hint).
	 */
	if (extsize) {
		if (new_last_fsb)
			align = roundup_64(new_last_fsb, extsize);
		else
			align = extsize;
		new_last_fsb = roundup_64(*last_fsb, align);
	}

	if (new_last_fsb) {
		error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
		if (error)
			return error;
		if (eof)
			*last_fsb = new_last_fsb;
	}
	return 0;
}
int
xfs_iomap_write_delay(
	xfs_inode_t	*ip,
	xfs_off_t	offset,
	size_t		count,
	int		ioflag,
	xfs_bmbt_irec_t *ret_imap,
	int		*nmaps)
{
	xfs_mount_t	*mp = ip->i_mount;
	xfs_iocore_t	*io = &ip->i_iocore;
	xfs_fileoff_t	offset_fsb;
	xfs_fileoff_t	last_fsb;
	xfs_fsize_t	isize;
	xfs_fsblock_t	firstblock;
	int		nimaps;
	int		error;
	xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
	int		aeof;
	int		fsynced = 0;

	ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);

	/*
	 * Make sure that the dquots are there. This doesn't hold
	 * the ilock across a disk read.
	 */

	error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
	if (error)
		return XFS_ERROR(error);

retry:
	isize = ip->i_d.di_size;
	if (io->io_new_size > isize) {
		isize = io->io_new_size;
	}

	aeof = 0;
	offset_fsb = XFS_B_TO_FSBT(mp, offset);
	last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
	/*
	 * If the caller is doing a write at the end of the file,
	 * then extend the allocation (and the buffer used for the write)
	 * out to the file system's write iosize.  We clean up any extra
	 * space left over when the file is closed in xfs_inactive().
	 *
	 * For sync writes, we are flushing delayed allocate space to
	 * try to make additional space available for allocation near
	 * the filesystem full boundary - preallocation hurts in that
	 * situation, of course.
	 */
	if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
		xfs_off_t	aligned_offset;
		xfs_filblks_t   count_fsb;
		unsigned int	iosize;
		xfs_fileoff_t	ioalign;
		int		n;
		xfs_fileoff_t   start_fsb;

		/*
		 * If there are any real blocks past eof, then don't
		 * do any speculative allocation.
		 */
		start_fsb = XFS_B_TO_FSBT(mp,
					((xfs_ufsize_t)(offset + count - 1)));
		count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
		while (count_fsb > 0) {
			nimaps = XFS_WRITE_IMAPS;
			error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
					0, &firstblock, 0, imap, &nimaps, NULL);
			if (error) {
				return error;
			}
			for (n = 0; n < nimaps; n++) {
				if ( !(io->io_flags & XFS_IOCORE_RT)  && 
					!imap[n].br_startblock) {
					cmn_err(CE_PANIC,"Access to block "
						"zero:  fs <%s> inode: %lld "
						"start_block : %llx start_off "
						": %llx blkcnt : %llx "
						"extent-state : %x \n",
						(ip->i_mount)->m_fsname,
						(long long)ip->i_ino,
						imap[n].br_startblock,
						imap[n].br_startoff,
						imap[n].br_blockcount,
						imap[n].br_state);
        			}
				if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
				    (imap[n].br_startblock != DELAYSTARTBLOCK)) {
					goto write_map;
				}
				start_fsb += imap[n].br_blockcount;
				count_fsb -= imap[n].br_blockcount;
			}
		}
		iosize = mp->m_writeio_blocks;
		aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
		ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
		last_fsb = ioalign + iosize;
		aeof = 1;
	}
write_map:
	nimaps = XFS_WRITE_IMAPS;
	firstblock = NULLFSBLOCK;

	/*
	 * If mounted with the "-o swalloc" option, roundup the allocation
	 * request to a stripe width boundary if the file size is >=
	 * stripe width and we are allocating past the allocation eof.
	 */
	if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth 
	    && (mp->m_flags & XFS_MOUNT_SWALLOC)
	    && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
		int eof;
		xfs_fileoff_t new_last_fsb;

		new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
		error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
		if (error) {
			return error;
		}
		if (eof) {
			last_fsb = new_last_fsb;
		}
	/*
	 * Roundup the allocation request to a stripe unit (m_dalign) boundary
	 * if the file size is >= stripe unit size, and we are allocating past
	 * the allocation eof.
	 */
	} else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
		   (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
		int eof;
		xfs_fileoff_t new_last_fsb;
		new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
		error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
		if (error) {
			return error;
		}
		if (eof) {
			last_fsb = new_last_fsb;
		}
	/*
	 * Round up the allocation request to a real-time extent boundary
	 * if the file is on the real-time subvolume.
	 */
	} else if (io->io_flags & XFS_IOCORE_RT && aeof) {
		int eof;
		xfs_fileoff_t new_last_fsb;

		new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
		error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
		if (error) {
			return error;
		}
		if (eof)
			last_fsb = new_last_fsb;
	}
	error = xfs_bmapi(NULL, ip, offset_fsb,
			  (xfs_filblks_t)(last_fsb - offset_fsb),
			  XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
			  XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
			  &nimaps, NULL);
	/*
	 * This can be EDQUOT, if nimaps == 0
	 */
	if (error && (error != ENOSPC)) {
		return XFS_ERROR(error);
	}
	/*
	 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
	 * then we must have run out of space.
	 */
	if (nimaps == 0) {
		xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
					io, offset, count);
		if (xfs_flush_space(ip, &fsynced, &ioflag))
			return XFS_ERROR(ENOSPC);

		error = 0;
		goto retry;
	}

	*ret_imap = imap[0];
	*nmaps = 1;
	if ( !(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
		cmn_err(CE_PANIC,"Access to block zero:  fs <%s> inode: %lld "
                        "start_block : %llx start_off : %llx blkcnt : %llx "
                        "extent-state : %x \n",
                        (ip->i_mount)->m_fsname,
                        (long long)ip->i_ino,
                        ret_imap->br_startblock, ret_imap->br_startoff,
                        ret_imap->br_blockcount,ret_imap->br_state);
	}
	return 0;
}