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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/xfs/xfs_dquot_item.c
Initial import
Diffstat (limited to 'fs/xfs/xfs_dquot_item.c')
-rw-r--r--fs/xfs/xfs_dquot_item.c443
1 files changed, 443 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dquot_item.c b/fs/xfs/xfs_dquot_item.c
new file mode 100644
index 000000000..814cff94e
--- /dev/null
+++ b/fs/xfs/xfs_dquot_item.c
@@ -0,0 +1,443 @@
+/*
+ * 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_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_quota.h"
+#include "xfs_error.h"
+#include "xfs_trans.h"
+#include "xfs_buf_item.h"
+#include "xfs_trans_priv.h"
+#include "xfs_qm.h"
+#include "xfs_log.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 void
+xfs_qm_dquot_logitem_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ *nvecs += 2;
+ *nbytes += sizeof(struct xfs_dq_logformat) +
+ sizeof(struct xfs_disk_dquot);
+}
+
+/*
+ * 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_vec *lv)
+{
+ struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+ struct xfs_dq_logformat *qlf;
+
+ qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
+ qlf->qlf_type = XFS_LI_DQUOT;
+ qlf->qlf_size = 2;
+ qlf->qlf_id = be32_to_cpu(qlip->qli_dquot->q_core.d_id);
+ qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
+ qlf->qlf_len = 1;
+ qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
+ xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
+
+ xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT,
+ &qlip->qli_dquot->q_core,
+ sizeof(struct xfs_disk_dquot));
+}
+
+/*
+ * 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);
+}
+
+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));
+}
+
+STATIC uint
+xfs_qm_dquot_logitem_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list) __releases(&lip->li_ailp->xa_lock)
+ __acquires(&lip->li_ailp->xa_lock)
+{
+ struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
+ struct xfs_buf *bp = NULL;
+ uint rval = XFS_ITEM_SUCCESS;
+ int error;
+
+ if (atomic_read(&dqp->q_pincount) > 0)
+ return XFS_ITEM_PINNED;
+
+ if (!xfs_dqlock_nowait(dqp))
+ return XFS_ITEM_LOCKED;
+
+ /*
+ * Re-check the pincount now that we stabilized the value by
+ * taking the quota lock.
+ */
+ if (atomic_read(&dqp->q_pincount) > 0) {
+ rval = XFS_ITEM_PINNED;
+ goto out_unlock;
+ }
+
+ /*
+ * Someone else is already flushing the dquot. Nothing we can do
+ * here but wait for the flush to finish and remove the item from
+ * the AIL.
+ */
+ if (!xfs_dqflock_nowait(dqp)) {
+ rval = XFS_ITEM_FLUSHING;
+ goto out_unlock;
+ }
+
+ spin_unlock(&lip->li_ailp->xa_lock);
+
+ error = xfs_qm_dqflush(dqp, &bp);
+ if (error) {
+ xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
+ __func__, error, dqp);
+ } else {
+ if (!xfs_buf_delwri_queue(bp, buffer_list))
+ rval = XFS_ITEM_FLUSHING;
+ xfs_buf_relse(bp);
+ }
+
+ spin_lock(&lip->li_ailp->xa_lock);
+out_unlock:
+ xfs_dqunlock(dqp);
+ return rval;
+}
+
+/*
+ * 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 const 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_unlock = xfs_qm_dquot_logitem_unlock,
+ .iop_committed = xfs_qm_dquot_logitem_committed,
+ .iop_push = xfs_qm_dquot_logitem_push,
+ .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;
+}
+
+/*------------------ 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 void
+xfs_qm_qoff_logitem_size(
+ struct xfs_log_item *lip,
+ int *nvecs,
+ int *nbytes)
+{
+ *nvecs += 1;
+ *nbytes += sizeof(struct xfs_qoff_logitem);
+}
+
+STATIC void
+xfs_qm_qoff_logitem_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
+ struct xfs_log_iovec *vecp = NULL;
+ struct xfs_qoff_logformat *qlf;
+
+ qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
+ qlf->qf_type = XFS_LI_QUOTAOFF;
+ qlf->qf_size = 1;
+ qlf->qf_flags = qflip->qql_flags;
+ xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
+}
+
+/*
+ * 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)
+{
+}
+
+/*
+ * There isn't much you can do to push a quotaoff item. It is simply
+ * stuck waiting for the log to be flushed to disk.
+ */
+STATIC uint
+xfs_qm_qoff_logitem_push(
+ struct xfs_log_item *lip,
+ struct list_head *buffer_list)
+{
+ 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;
+}
+
+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, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
+
+ 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 const 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_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 const 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_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_start_lip = start;
+ qf->qql_flags = flags;
+ return qf;
+}