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