1 files changed, 529 insertions, 0 deletions

diff --git a/fs/xfs/xfs_dquot_item.c b/fs/xfs/xfs_dquot_item.c
new file mode 100644
index 0000000..9e0e2fa
--- /dev/null
+++ b/fs/xfs/xfs_dquot_item.c
@@ -0,0 +1,529 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_alloc.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_trans_priv.h"
+#include "xfs_qm.h"
+
+static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_dq_logitem, qli_item);
+}
+
+/*
+ * returns the number of iovecs needed to log the given dquot item.
+ */
+STATIC uint
+xfs_qm_dquot_logitem_size(
+	struct xfs_log_item	*lip)
+{
+	/*
+	 * we need only two iovecs, one for the format, one for the real thing
+	 */
+	return 2;
+}
+
+/*
+ * fills in the vector of log iovecs for the given dquot log item.
+ */
+STATIC void
+xfs_qm_dquot_logitem_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_iovec	*logvec)
+{
+	struct xfs_dq_logitem	*qlip = DQUOT_ITEM(lip);
+
+	logvec->i_addr = &qlip->qli_format;
+	logvec->i_len  = sizeof(xfs_dq_logformat_t);
+	logvec->i_type = XLOG_REG_TYPE_QFORMAT;
+	logvec++;
+	logvec->i_addr = &qlip->qli_dquot->q_core;
+	logvec->i_len  = sizeof(xfs_disk_dquot_t);
+	logvec->i_type = XLOG_REG_TYPE_DQUOT;
+
+	ASSERT(2 == lip->li_desc->lid_size);
+	qlip->qli_format.qlf_size = 2;
+
+}
+
+/*
+ * Increment the pin count of the given dquot.
+ */
+STATIC void
+xfs_qm_dquot_logitem_pin(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+	atomic_inc(&dqp->q_pincount);
+}
+
+/*
+ * Decrement the pin count of the given dquot, and wake up
+ * anyone in xfs_dqwait_unpin() if the count goes to 0.	 The
+ * dquot must have been previously pinned with a call to
+ * xfs_qm_dquot_logitem_pin().
+ */
+STATIC void
+xfs_qm_dquot_logitem_unpin(
+	struct xfs_log_item	*lip,
+	int			remove)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+
+	ASSERT(atomic_read(&dqp->q_pincount) > 0);
+	if (atomic_dec_and_test(&dqp->q_pincount))
+		wake_up(&dqp->q_pinwait);
+}
+
+/*
+ * Given the logitem, this writes the corresponding dquot entry to disk
+ * asynchronously. This is called with the dquot entry securely locked;
+ * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
+ * at the end.
+ */
+STATIC void
+xfs_qm_dquot_logitem_push(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+	int			error;
+
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+	ASSERT(!completion_done(&dqp->q_flush));
+
+	/*
+	 * Since we were able to lock the dquot's flush lock and
+	 * we found it on the AIL, the dquot must be dirty.  This
+	 * is because the dquot is removed from the AIL while still
+	 * holding the flush lock in xfs_dqflush_done().  Thus, if
+	 * we found it in the AIL and were able to obtain the flush
+	 * lock without sleeping, then there must not have been
+	 * anyone in the process of flushing the dquot.
+	 */
+	error = xfs_qm_dqflush(dqp, 0);
+	if (error)
+		xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
+			__func__, error, dqp);
+	xfs_dqunlock(dqp);
+}
+
+STATIC xfs_lsn_t
+xfs_qm_dquot_logitem_committed(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+	/*
+	 * We always re-log the entire dquot when it becomes dirty,
+	 * so, the latest copy _is_ the only one that matters.
+	 */
+	return lsn;
+}
+
+/*
+ * This is called to wait for the given dquot to be unpinned.
+ * Most of these pin/unpin routines are plagiarized from inode code.
+ */
+void
+xfs_qm_dqunpin_wait(
+	struct xfs_dquot	*dqp)
+{
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+	if (atomic_read(&dqp->q_pincount) == 0)
+		return;
+
+	/*
+	 * Give the log a push so we don't wait here too long.
+	 */
+	xfs_log_force(dqp->q_mount, 0);
+	wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 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(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_dq_logitem	*qlip = DQUOT_ITEM(lip);
+	struct xfs_dquot	*dqp = qlip->qli_dquot;
+	struct xfs_buf		*bp;
+
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+
+	/*
+	 * 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 (completion_done(&dqp->q_flush) ||
+	    !(lip->li_flags & XFS_LI_IN_AIL)) {
+		xfs_dqunlock(dqp);
+		return;
+	}
+
+	bp = xfs_incore(dqp->q_mount->m_ddev_targp, qlip->qli_format.qlf_blkno,
+			dqp->q_mount->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
+	xfs_dqunlock(dqp);
+	if (!bp)
+		return;
+	if (XFS_BUF_ISDELAYWRITE(bp))
+		xfs_buf_delwri_promote(bp);
+	xfs_buf_relse(bp);
+}
+
+/*
+ * This is called to attempt to lock the dquot associated with this
+ * dquot log item.  Don't sleep on the dquot lock or the flush lock.
+ * If the flush lock is already held, indicating that the dquot has
+ * been or is in the process of being flushed, then see if we can
+ * find the dquot's buffer in the buffer cache without sleeping.  If
+ * we can and it is marked delayed write, then we want to send it out.
+ * We delay doing so until the push routine, though, to avoid sleeping
+ * in any device strategy routines.
+ */
+STATIC uint
+xfs_qm_dquot_logitem_trylock(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+
+	if (atomic_read(&dqp->q_pincount) > 0)
+		return XFS_ITEM_PINNED;
+
+	if (!xfs_qm_dqlock_nowait(dqp))
+		return XFS_ITEM_LOCKED;
+
+	if (!xfs_dqflock_nowait(dqp)) {
+		/*
+		 * dquot has already been flushed to the backing buffer,
+		 * leave it locked, pushbuf routine will unlock it.
+		 */
+		return XFS_ITEM_PUSHBUF;
+	}
+
+	ASSERT(lip->li_flags & XFS_LI_IN_AIL);
+	return XFS_ITEM_SUCCESS;
+}
+
+/*
+ * Unlock the dquot associated with the log item.
+ * Clear the fields of the dquot and dquot log item that
+ * are specific to the current transaction.  If the
+ * hold flags is set, do not unlock the dquot.
+ */
+STATIC void
+xfs_qm_dquot_logitem_unlock(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+
+	/*
+	 * Clear the transaction pointer in the dquot
+	 */
+	dqp->q_transp = NULL;
+
+	/*
+	 * dquots are never 'held' from getting unlocked at the end of
+	 * a transaction.  Their locking and unlocking is hidden inside the
+	 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
+	 * for the logitem.
+	 */
+	xfs_dqunlock(dqp);
+}
+
+/*
+ * this needs to stamp an lsn into the dquot, I think.
+ * rpc's that look at user dquot's would then have to
+ * push on the dependency recorded in the dquot
+ */
+STATIC void
+xfs_qm_dquot_logitem_committing(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+}
+
+/*
+ * This is the ops vector for dquots
+ */
+static struct xfs_item_ops xfs_dquot_item_ops = {
+	.iop_size	= xfs_qm_dquot_logitem_size,
+	.iop_format	= xfs_qm_dquot_logitem_format,
+	.iop_pin	= xfs_qm_dquot_logitem_pin,
+	.iop_unpin	= xfs_qm_dquot_logitem_unpin,
+	.iop_trylock	= xfs_qm_dquot_logitem_trylock,
+	.iop_unlock	= xfs_qm_dquot_logitem_unlock,
+	.iop_committed	= xfs_qm_dquot_logitem_committed,
+	.iop_push	= xfs_qm_dquot_logitem_push,
+	.iop_pushbuf	= xfs_qm_dquot_logitem_pushbuf,
+	.iop_committing = xfs_qm_dquot_logitem_committing
+};
+
+/*
+ * Initialize the dquot log item for a newly allocated dquot.
+ * The dquot isn't locked at this point, but it isn't on any of the lists
+ * either, so we don't care.
+ */
+void
+xfs_qm_dquot_logitem_init(
+	struct xfs_dquot	*dqp)
+{
+	struct xfs_dq_logitem	*lp = &dqp->q_logitem;
+
+	xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
+					&xfs_dquot_item_ops);
+	lp->qli_dquot = dqp;
+	lp->qli_format.qlf_type = XFS_LI_DQUOT;
+	lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
+	lp->qli_format.qlf_blkno = dqp->q_blkno;
+	lp->qli_format.qlf_len = 1;
+	/*
+	 * This is just the offset of this dquot within its buffer
+	 * (which is currently 1 FSB and probably won't change).
+	 * Hence 32 bits for this offset should be just fine.
+	 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
+	 * here, and recompute it at recovery time.
+	 */
+	lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
+}
+
+/*------------------  QUOTAOFF LOG ITEMS  -------------------*/
+
+static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_qoff_logitem, qql_item);
+}
+
+
+/*
+ * This returns the number of iovecs needed to log the given quotaoff item.
+ * We only need 1 iovec for an quotaoff item.  It just logs the
+ * quotaoff_log_format structure.
+ */
+STATIC uint
+xfs_qm_qoff_logitem_size(
+	struct xfs_log_item	*lip)
+{
+	return 1;
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the
+ * given quotaoff log item. We use only 1 iovec, and we point that
+ * at the quotaoff_log_format structure embedded in the quotaoff item.
+ * It is at this point that we assert that all of the extent
+ * slots in the quotaoff item have been filled.
+ */
+STATIC void
+xfs_qm_qoff_logitem_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_iovec	*log_vector)
+{
+	struct xfs_qoff_logitem	*qflip = QOFF_ITEM(lip);
+
+	ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
+
+	log_vector->i_addr = &qflip->qql_format;
+	log_vector->i_len = sizeof(xfs_qoff_logitem_t);
+	log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF;
+	qflip->qql_format.qf_size = 1;
+}
+
+/*
+ * Pinning has no meaning for an quotaoff item, so just return.
+ */
+STATIC void
+xfs_qm_qoff_logitem_pin(
+	struct xfs_log_item	*lip)
+{
+}
+
+/*
+ * Since pinning has no meaning for an quotaoff item, unpinning does
+ * not either.
+ */
+STATIC void
+xfs_qm_qoff_logitem_unpin(
+	struct xfs_log_item	*lip,
+	int			remove)
+{
+}
+
+/*
+ * Quotaoff items have no locking, so just return success.
+ */
+STATIC uint
+xfs_qm_qoff_logitem_trylock(
+	struct xfs_log_item	*lip)
+{
+	return XFS_ITEM_LOCKED;
+}
+
+/*
+ * Quotaoff items have no locking or pushing, so return failure
+ * so that the caller doesn't bother with us.
+ */
+STATIC void
+xfs_qm_qoff_logitem_unlock(
+	struct xfs_log_item	*lip)
+{
+}
+
+/*
+ * The quotaoff-start-item is logged only once and cannot be moved in the log,
+ * so simply return the lsn at which it's been logged.
+ */
+STATIC xfs_lsn_t
+xfs_qm_qoff_logitem_committed(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+	return lsn;
+}
+
+/*
+ * There isn't much you can do to push on an quotaoff item.  It is simply
+ * stuck waiting for the log to be flushed to disk.
+ */
+STATIC void
+xfs_qm_qoff_logitem_push(
+	struct xfs_log_item	*lip)
+{
+}
+
+
+STATIC xfs_lsn_t
+xfs_qm_qoffend_logitem_committed(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		lsn)
+{
+	struct xfs_qoff_logitem	*qfe = QOFF_ITEM(lip);
+	struct xfs_qoff_logitem	*qfs = qfe->qql_start_lip;
+	struct xfs_ail		*ailp = qfs->qql_item.li_ailp;
+
+	/*
+	 * Delete the qoff-start logitem from the AIL.
+	 * xfs_trans_ail_delete() drops the AIL lock.
+	 */
+	spin_lock(&ailp->xa_lock);
+	xfs_trans_ail_delete(ailp, (xfs_log_item_t *)qfs);
+
+	kmem_free(qfs);
+	kmem_free(qfe);
+	return (xfs_lsn_t)-1;
+}
+
+/*
+ * XXX rcc - don't know quite what to do with this.  I think we can
+ * just ignore it.  The only time that isn't the case is if we allow
+ * the client to somehow see that quotas have been turned off in which
+ * we can't allow that to get back until the quotaoff hits the disk.
+ * So how would that happen?  Also, do we need different routines for
+ * quotaoff start and quotaoff end?  I suspect the answer is yes but
+ * to be sure, I need to look at the recovery code and see how quota off
+ * recovery is handled (do we roll forward or back or do something else).
+ * If we roll forwards or backwards, then we need two separate routines,
+ * one that does nothing and one that stamps in the lsn that matters
+ * (truly makes the quotaoff irrevocable).  If we do something else,
+ * then maybe we don't need two.
+ */
+STATIC void
+xfs_qm_qoff_logitem_committing(
+	struct xfs_log_item	*lip,
+	xfs_lsn_t		commit_lsn)
+{
+}
+
+static struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
+	.iop_size	= xfs_qm_qoff_logitem_size,
+	.iop_format	= xfs_qm_qoff_logitem_format,
+	.iop_pin	= xfs_qm_qoff_logitem_pin,
+	.iop_unpin	= xfs_qm_qoff_logitem_unpin,
+	.iop_trylock	= xfs_qm_qoff_logitem_trylock,
+	.iop_unlock	= xfs_qm_qoff_logitem_unlock,
+	.iop_committed	= xfs_qm_qoffend_logitem_committed,
+	.iop_push	= xfs_qm_qoff_logitem_push,
+	.iop_committing = xfs_qm_qoff_logitem_committing
+};
+
+/*
+ * This is the ops vector shared by all quotaoff-start log items.
+ */
+static struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
+	.iop_size	= xfs_qm_qoff_logitem_size,
+	.iop_format	= xfs_qm_qoff_logitem_format,
+	.iop_pin	= xfs_qm_qoff_logitem_pin,
+	.iop_unpin	= xfs_qm_qoff_logitem_unpin,
+	.iop_trylock	= xfs_qm_qoff_logitem_trylock,
+	.iop_unlock	= xfs_qm_qoff_logitem_unlock,
+	.iop_committed	= xfs_qm_qoff_logitem_committed,
+	.iop_push	= xfs_qm_qoff_logitem_push,
+	.iop_committing = xfs_qm_qoff_logitem_committing
+};
+
+/*
+ * Allocate and initialize an quotaoff item of the correct quota type(s).
+ */
+struct xfs_qoff_logitem *
+xfs_qm_qoff_logitem_init(
+	struct xfs_mount	*mp,
+	struct xfs_qoff_logitem	*start,
+	uint			flags)
+{
+	struct xfs_qoff_logitem	*qf;
+
+	qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
+
+	xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
+			&xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
+	qf->qql_item.li_mountp = mp;
+	qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
+	qf->qql_format.qf_flags = flags;
+	qf->qql_start_lip = start;
+	return qf;
+}