/*
 * initialize a buffer full of dquots and log the whole thing
 */
STATIC void
xfs_qm_init_dquot_blk(
	xfs_trans_t	*tp,
	xfs_mount_t	*mp,
	xfs_dqid_t	id,
	uint		type,
	xfs_buf_t	*bp)
{
	xfs_dqblk_t	*d;
	int		curid, i;

	ASSERT(tp);
	ASSERT(XFS_BUF_ISBUSY(bp));
	ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);

	d = (xfs_dqblk_t *)XFS_BUF_PTR(bp);

	/*
	 * ID of the first dquot in the block - id's are zero based.
	 */
	curid = id - (id % XFS_QM_DQPERBLK(mp));
	ASSERT(curid >= 0);
	memset(d, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp)));
	for (i = 0; i < XFS_QM_DQPERBLK(mp); i++, d++, curid++)
		xfs_qm_dqinit_core(curid, type, d);
	xfs_trans_dquot_buf(tp, bp,
			    (type & XFS_DQ_USER ? XFS_BLI_UDQUOT_BUF :
			    ((type & XFS_DQ_PROJ) ? XFS_BLI_PDQUOT_BUF :
			     XFS_BLI_GDQUOT_BUF)));
	xfs_trans_log_buf(tp, bp, 0, BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1);
}
/*
 * Give the buffer a little push if it is incore and
 * wait on the flush lock.
 */
void
xfs_qm_dqflock_pushbuf_wait(
	xfs_dquot_t	*dqp)
{
	xfs_buf_t	*bp;

	/*
	 * Check to see if the dquot has been flushed delayed
	 * write.  If so, grab its buffer and send it
	 * out immediately.  We'll be able to acquire
	 * the flush lock when the I/O completes.
	 */
	bp = xfs_incore(dqp->q_mount->m_ddev_targp, dqp->q_blkno,
		    XFS_QI_DQCHUNKLEN(dqp->q_mount),
		    XFS_INCORE_TRYLOCK);
	if (bp != NULL) {
		if (XFS_BUF_ISDELAYWRITE(bp)) {
			if (XFS_BUF_ISPINNED(bp)) {
				xfs_log_force(dqp->q_mount,
					      (xfs_lsn_t)0,
					      XFS_LOG_FORCE);
			}
			xfs_bawrite(dqp->q_mount, bp);
		} else {
			xfs_buf_relse(bp);
		}
	}
	xfs_dqflock(dqp);
}
/*
 * allocate an incore dquot from the kernel heap,
 * and fill its core with quota information kept on disk.
 * If XFS_QMOPT_DQALLOC is set, it'll allocate a dquot on disk
 * if it wasn't already allocated.
 */
STATIC int
xfs_qm_idtodq(
	xfs_mount_t	*mp,
	xfs_dqid_t	id,	 /* gid or uid, depending on type */
	uint		type,	 /* UDQUOT or GDQUOT */
	uint		flags,	 /* DQALLOC, DQREPAIR */
	xfs_dquot_t	**O_dqpp)/* OUT : incore dquot, not locked */
{
	xfs_dquot_t	*dqp;
	int		error;
	xfs_trans_t	*tp;
	int		cancelflags=0;

	dqp = xfs_qm_dqinit(mp, id, type);
	tp = NULL;
	if (flags & XFS_QMOPT_DQALLOC) {
		tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
		if ((error = xfs_trans_reserve(tp,
				       XFS_QM_DQALLOC_SPACE_RES(mp),
				       XFS_WRITE_LOG_RES(mp) +
					      BBTOB(XFS_QI_DQCHUNKLEN(mp)) - 1 +
					      128,
				       0,
				       XFS_TRANS_PERM_LOG_RES,
				       XFS_WRITE_LOG_COUNT))) {
			cancelflags = 0;
			goto error0;
		}
		cancelflags = XFS_TRANS_RELEASE_LOG_RES;
	}

	/*
	 * Read it from disk; xfs_dqread() takes care of
	 * all the necessary initialization of dquot's fields (locks, etc)
	 */
	if ((error = xfs_qm_dqread(&tp, id, dqp, flags))) {
		/*
		 * This can happen if quotas got turned off (ESRCH),
		 * or if the dquot didn't exist on disk and we ask to
		 * allocate (ENOENT).
		 */
		xfs_dqtrace_entry(dqp, "DQREAD FAIL");
		cancelflags |= XFS_TRANS_ABORT;
		goto error0;
	}
	if (tp) {
		if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES,
					     NULL)))
			goto error1;
	}

	*O_dqpp = dqp;
	return (0);

 error0:
	ASSERT(error);
	if (tp)
		xfs_trans_cancel(tp, cancelflags);
 error1:
	xfs_qm_dqdestroy(dqp);
	*O_dqpp = NULL;
	return (error);
}
/*
 * Maps a dquot to the buffer containing its on-disk version.
 * This returns a ptr to the buffer containing the on-disk dquot
 * in the bpp param, and a ptr to the on-disk dquot within that buffer
 */
STATIC int
xfs_qm_dqtobp(
	xfs_trans_t		**tpp,
	xfs_dquot_t		*dqp,
	xfs_disk_dquot_t	**O_ddpp,
	xfs_buf_t		**O_bpp,
	uint			flags)
{
	xfs_bmbt_irec_t map;
	int		nmaps, error;
	xfs_buf_t	*bp;
	xfs_inode_t	*quotip;
	xfs_mount_t	*mp;
	xfs_disk_dquot_t *ddq;
	xfs_dqid_t	id;
	boolean_t	newdquot;
	xfs_trans_t	*tp = (tpp ? *tpp : NULL);

	mp = dqp->q_mount;
	id = be32_to_cpu(dqp->q_core.d_id);
	nmaps = 1;
	newdquot = B_FALSE;

	/*
	 * If we don't know where the dquot lives, find out.
	 */
	if (dqp->q_blkno == (xfs_daddr_t) 0) {
		/* We use the id as an index */
		dqp->q_fileoffset = (xfs_fileoff_t)id / XFS_QM_DQPERBLK(mp);
		nmaps = 1;
		quotip = XFS_DQ_TO_QIP(dqp);
		xfs_ilock(quotip, XFS_ILOCK_SHARED);
		/*
		 * Return if this type of quotas is turned off while we didn't
		 * have an inode lock
		 */
		if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
			xfs_iunlock(quotip, XFS_ILOCK_SHARED);
			return (ESRCH);
		}
		/*
		 * Find the block map; no allocations yet
		 */
		error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset,
				  XFS_DQUOT_CLUSTER_SIZE_FSB,
				  XFS_BMAPI_METADATA,
				  NULL, 0, &map, &nmaps, NULL);

		xfs_iunlock(quotip, XFS_ILOCK_SHARED);
		if (error)
			return (error);
		ASSERT(nmaps == 1);
		ASSERT(map.br_blockcount == 1);

		/*
		 * offset of dquot in the (fixed sized) dquot chunk.
		 */
		dqp->q_bufoffset = (id % XFS_QM_DQPERBLK(mp)) *
			sizeof(xfs_dqblk_t);
		if (map.br_startblock == HOLESTARTBLOCK) {
			/*
			 * We don't allocate unless we're asked to
			 */
			if (!(flags & XFS_QMOPT_DQALLOC))
				return (ENOENT);

			ASSERT(tp);
			if ((error = xfs_qm_dqalloc(tpp, mp, dqp, quotip,
						dqp->q_fileoffset, &bp)))
				return (error);
			tp = *tpp;
			newdquot = B_TRUE;
		} else {
			/*
			 * store the blkno etc so that we don't have to do the
			 * mapping all the time
			 */
			dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);
		}
	}
	ASSERT(dqp->q_blkno != DELAYSTARTBLOCK);
	ASSERT(dqp->q_blkno != HOLESTARTBLOCK);

	/*
	 * Read in the buffer, unless we've just done the allocation
	 * (in which case we already have the buf).
	 */
	if (! newdquot) {
		xfs_dqtrace_entry(dqp, "DQTOBP READBUF");
		if ((error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
					       dqp->q_blkno,
					       XFS_QI_DQCHUNKLEN(mp),
					       0, &bp))) {
			return (error);
		}
		if (error || !bp)
			return XFS_ERROR(error);
	}
	ASSERT(XFS_BUF_ISBUSY(bp));
	ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);

	/*
	 * calculate the location of the dquot inside the buffer.
	 */
	ddq = (xfs_disk_dquot_t *)((char *)XFS_BUF_PTR(bp) + dqp->q_bufoffset);

	/*
	 * A simple sanity check in case we got a corrupted dquot...
	 */
	if (xfs_qm_dqcheck(ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES,
			   flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN),
			   "dqtobp")) {
		if (!(flags & XFS_QMOPT_DQREPAIR)) {
			xfs_trans_brelse(tp, bp);
			return XFS_ERROR(EIO);
		}
		XFS_BUF_BUSY(bp); /* We dirtied this */
	}

	*O_bpp = bp;
	*O_ddpp = ddq;

	return (0);
}
/*
 * Allocate a block and fill it with dquots.
 * This is called when the bmapi finds a hole.
 */
STATIC int
xfs_qm_dqalloc(
	xfs_trans_t	**tpp,
	xfs_mount_t	*mp,
	xfs_dquot_t	*dqp,
	xfs_inode_t	*quotip,
	xfs_fileoff_t	offset_fsb,
	xfs_buf_t	**O_bpp)
{
	xfs_fsblock_t	firstblock;
	xfs_bmap_free_t flist;
	xfs_bmbt_irec_t map;
	int		nmaps, error, committed;
	xfs_buf_t	*bp;
	xfs_trans_t	*tp = *tpp;

	ASSERT(tp != NULL);
	xfs_dqtrace_entry(dqp, "DQALLOC");

	/*
	 * Initialize the bmap freelist prior to calling bmapi code.
	 */
	XFS_BMAP_INIT(&flist, &firstblock);
	xfs_ilock(quotip, XFS_ILOCK_EXCL);
	/*
	 * Return if this type of quotas is turned off while we didn't
	 * have an inode lock
	 */
	if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
		xfs_iunlock(quotip, XFS_ILOCK_EXCL);
		return (ESRCH);
	}

	/*
	 * xfs_trans_commit normally decrements the vnode ref count
	 * when it unlocks the inode. Since we want to keep the quota
	 * inode around, we bump the vnode ref count now.
	 */
	VN_HOLD(XFS_ITOV(quotip));

	xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
	nmaps = 1;
	if ((error = xfs_bmapi(tp, quotip,
			      offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB,
			      XFS_BMAPI_METADATA | XFS_BMAPI_WRITE,
			      &firstblock,
			      XFS_QM_DQALLOC_SPACE_RES(mp),
			      &map, &nmaps, &flist))) {
		goto error0;
	}
	ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
	ASSERT(nmaps == 1);
	ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
	       (map.br_startblock != HOLESTARTBLOCK));

	/*
	 * Keep track of the blkno to save a lookup later
	 */
	dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);

	/* now we can just get the buffer (there's nothing to read yet) */
	bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
			       dqp->q_blkno,
			       XFS_QI_DQCHUNKLEN(mp),
			       0);
	if (!bp || (error = XFS_BUF_GETERROR(bp)))
		goto error1;
	/*
	 * Make a chunk of dquots out of this buffer and log
	 * the entire thing.
	 */
	xfs_qm_init_dquot_blk(tp, mp, be32_to_cpu(dqp->q_core.d_id),
			      dqp->dq_flags & XFS_DQ_ALLTYPES, bp);

	/*
	 * xfs_bmap_finish() may commit the current transaction and
	 * start a second transaction if the freelist is not empty.
	 *
	 * Since we still want to modify this buffer, we need to
	 * ensure that the buffer is not released on commit of
	 * the first transaction and ensure the buffer is added to the
	 * second transaction.
	 *
	 * If there is only one transaction then don't stop the buffer
	 * from being released when it commits later on.
	 */

	xfs_trans_bhold(tp, bp);

	if ((error = xfs_bmap_finish(tpp, &flist, firstblock, &committed))) {
		goto error1;
	}

	if (committed) {
		tp = *tpp;
		xfs_trans_bjoin(tp, bp);
	} else {
		xfs_trans_bhold_release(tp, bp);
	}

	*O_bpp = bp;
	return 0;

      error1:
	xfs_bmap_cancel(&flist);
      error0:
	xfs_iunlock(quotip, XFS_ILOCK_EXCL);

	return (error);
}
Beispiel #6
0
/*
 * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
 * the dquot is locked by us, but the flush lock isn't. So, here we are
 * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
 * If so, we want to push it out to help us take this item off the AIL as soon
 * as possible.
 *
 * We must not be holding the AIL lock at this point. Calling incore() to
 * search the buffer cache can be a time consuming thing, and AIL lock is a
 * spinlock.
 */
STATIC void
xfs_qm_dquot_logitem_pushbuf(
	xfs_dq_logitem_t    *qip)
{
	xfs_dquot_t	*dqp;
	xfs_mount_t	*mp;
	xfs_buf_t	*bp;
	uint		dopush;

	dqp = qip->qli_dquot;
	ASSERT(XFS_DQ_IS_LOCKED(dqp));

	/*
	 * The qli_pushbuf_flag keeps others from
	 * trying to duplicate our effort.
	 */
	ASSERT(qip->qli_pushbuf_flag != 0);
	ASSERT(qip->qli_push_owner == current_pid());

	/*
	 * If flushlock isn't locked anymore, chances are that the
	 * inode flush completed and the inode was taken off the AIL.
	 * So, just get out.
	 */
	if (!issemalocked(&(dqp->q_flock))  ||
	    ((qip->qli_item.li_flags & XFS_LI_IN_AIL) == 0)) {
		qip->qli_pushbuf_flag = 0;
		xfs_dqunlock(dqp);
		return;
	}
	mp = dqp->q_mount;
	bp = xfs_incore(mp->m_ddev_targp, qip->qli_format.qlf_blkno,
		    XFS_QI_DQCHUNKLEN(mp),
		    XFS_INCORE_TRYLOCK);
	if (bp != NULL) {
		if (XFS_BUF_ISDELAYWRITE(bp)) {
			dopush = ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
				  issemalocked(&(dqp->q_flock)));
			qip->qli_pushbuf_flag = 0;
			xfs_dqunlock(dqp);

			if (XFS_BUF_ISPINNED(bp)) {
				xfs_log_force(mp, (xfs_lsn_t)0,
					      XFS_LOG_FORCE);
			}
			if (dopush) {
				int	error;
#ifdef XFSRACEDEBUG
				delay_for_intr();
				delay(300);
#endif
				error = xfs_bawrite(mp, bp);
				if (error)
					xfs_fs_cmn_err(CE_WARN, mp,
	"xfs_qm_dquot_logitem_pushbuf: pushbuf error %d on qip %p, bp %p",
							error, qip, bp);
			} else {
				xfs_buf_relse(bp);
			}
		} else {
			qip->qli_pushbuf_flag = 0;
			xfs_dqunlock(dqp);
			xfs_buf_relse(bp);
		}
		return;
	}

	qip->qli_pushbuf_flag = 0;
	xfs_dqunlock(dqp);
}
Beispiel #7
0
/*
 * Allocate a block and fill it with dquots.
 * This is called when the bmapi finds a hole.
 */
STATIC int
xfs_qm_dqalloc(
	xfs_trans_t	*tp,
	xfs_mount_t	*mp,
	xfs_dquot_t	*dqp,
	xfs_inode_t	*quotip,
	xfs_fileoff_t	offset_fsb,
	xfs_buf_t	**O_bpp)
{
	xfs_fsblock_t	firstblock;
	xfs_bmap_free_t flist;
	xfs_bmbt_irec_t map;
	int		nmaps, error, committed;
	xfs_buf_t	*bp;

	ASSERT(tp != NULL);
	xfs_dqtrace_entry(dqp, "DQALLOC");

	/*
	 * Initialize the bmap freelist prior to calling bmapi code.
	 */
	XFS_BMAP_INIT(&flist, &firstblock);
	xfs_ilock(quotip, XFS_ILOCK_EXCL);
	/*
	 * Return if this type of quotas is turned off while we didn't
	 * have an inode lock
	 */
	if (XFS_IS_THIS_QUOTA_OFF(dqp)) {
		xfs_iunlock(quotip, XFS_ILOCK_EXCL);
		return (ESRCH);
	}

	/*
	 * xfs_trans_commit normally decrements the vnode ref count
	 * when it unlocks the inode. Since we want to keep the quota
	 * inode around, we bump the vnode ref count now.
	 */
	VN_HOLD(XFS_ITOV(quotip));

	xfs_trans_ijoin(tp, quotip, XFS_ILOCK_EXCL);
	nmaps = 1;
	if ((error = xfs_bmapi(tp, quotip,
			      offset_fsb, XFS_DQUOT_CLUSTER_SIZE_FSB,
			      XFS_BMAPI_METADATA | XFS_BMAPI_WRITE,
			      &firstblock,
			      XFS_QM_DQALLOC_SPACE_RES(mp),
			      &map, &nmaps, &flist))) {
		goto error0;
	}
	ASSERT(map.br_blockcount == XFS_DQUOT_CLUSTER_SIZE_FSB);
	ASSERT(nmaps == 1);
	ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
	       (map.br_startblock != HOLESTARTBLOCK));

	/*
	 * Keep track of the blkno to save a lookup later
	 */
	dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock);

	/* now we can just get the buffer (there's nothing to read yet) */
	bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
			       dqp->q_blkno,
			       XFS_QI_DQCHUNKLEN(mp),
			       0);
	if (!bp || (error = XFS_BUF_GETERROR(bp)))
		goto error1;
	/*
	 * Make a chunk of dquots out of this buffer and log
	 * the entire thing.
	 */
	xfs_qm_init_dquot_blk(tp, mp, INT_GET(dqp->q_core.d_id, ARCH_CONVERT),
			      dqp->dq_flags & (XFS_DQ_USER|XFS_DQ_GROUP),
			      bp);

	if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed))) {
		goto error1;
	}

	*O_bpp = bp;
	return 0;

      error1:
	xfs_bmap_cancel(&flist);
      error0:
	xfs_iunlock(quotip, XFS_ILOCK_EXCL);

	return (error);
}