Viewing file:  xfs_dquot_item.c (18.55 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 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.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include <xfs.h>
#include <xfs_quota_priv.h>
/*
* returns the number of iovecs needed to log the given dquot item.
*/
/* ARGSUSED */
STATIC uint
xfs_qm_dquot_logitem_size(
xfs_dq_logitem_t *logitem)
{
/*
* 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(
xfs_dq_logitem_t *logitem,
xfs_log_iovec_t *logvec)
{
ASSERT(logitem);
ASSERT(logitem->qli_dquot);
logvec->i_addr = (xfs_caddr_t)&logitem->qli_format;
logvec->i_len = sizeof(xfs_dq_logformat_t);
logvec++;
logvec->i_addr = (xfs_caddr_t)&logitem->qli_dquot->q_core;
logvec->i_len = sizeof(xfs_disk_dquot_t);
ASSERT(2 == logitem->qli_item.li_desc->lid_size);
logitem->qli_format.qlf_size = 2;
}
/*
* Increment the pin count of the given dquot.
* This value is protected by pinlock spinlock in the xQM structure.
*/
STATIC void
xfs_qm_dquot_logitem_pin(
xfs_dq_logitem_t *logitem)
{
int s;
xfs_dquot_t *dqp;
dqp = logitem->qli_dquot;
ASSERT(XFS_DQ_IS_LOCKED(dqp));
s = XFS_DQ_PINLOCK(dqp);
dqp->q_pincount++;
XFS_DQ_PINUNLOCK(dqp, s);
}
/*
* 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_dqpin().
*/
STATIC void
xfs_qm_dquot_logitem_unpin(
xfs_dq_logitem_t *logitem)
{
int s;
xfs_dquot_t *dqp;
dqp = logitem->qli_dquot;
ASSERT(dqp->q_pincount > 0);
s = XFS_DQ_PINLOCK(dqp);
dqp->q_pincount--;
if (dqp->q_pincount == 0) {
sv_broadcast(&dqp->q_pinwait);
}
XFS_DQ_PINUNLOCK(dqp, s);
}
/* ARGSUSED */
STATIC void
xfs_qm_dquot_logitem_unpin_remove(
xfs_dq_logitem_t *logitem,
xfs_trans_t *tp)
{
xfs_qm_dquot_logitem_unpin(logitem);
}
/*
* 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(
xfs_dq_logitem_t *logitem)
{
xfs_dquot_t *dqp;
dqp = logitem->qli_dquot;
ASSERT(XFS_DQ_IS_LOCKED(dqp));
ASSERT(XFS_DQ_IS_FLUSH_LOCKED(dqp));
/*
* 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.
*/
xfs_qm_dqflush(dqp, XFS_B_DELWRI);
xfs_dqunlock(dqp);
}
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_dquot_logitem_committed(
xfs_dq_logitem_t *l,
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(
xfs_dquot_t *dqp)
{
int s;
ASSERT(XFS_DQ_IS_LOCKED(dqp));
if (dqp->q_pincount == 0) {
return;
}
/*
* Give the log a push so we don't wait here too long.
*/
xfs_log_force(dqp->q_mount, (xfs_lsn_t)0, XFS_LOG_FORCE);
s = XFS_DQ_PINLOCK(dqp);
if (dqp->q_pincount == 0) {
XFS_DQ_PINUNLOCK(dqp, s);
return;
}
sv_wait(&(dqp->q_pinwait), PINOD,
&(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s);
}
/*
* 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 buffercache 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 == get_thread_id());
/*
* 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 ((valusema(&(dqp->q_flock)) > 0) ||
((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_targ, 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) &&
(valusema(&(dqp->q_flock)) <= 0));
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) {
#ifdef XFSRACEDEBUG
delay_for_intr();
delay(300);
#endif
xfs_bawrite(mp, 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);
}
/*
* 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(
xfs_dq_logitem_t *qip)
{
xfs_dquot_t *dqp;
uint retval;
dqp = qip->qli_dquot;
if (dqp->q_pincount > 0)
return (XFS_ITEM_PINNED);
if (! xfs_qm_dqlock_nowait(dqp))
return (XFS_ITEM_LOCKED);
retval = XFS_ITEM_SUCCESS;
if (! xfs_qm_dqflock_nowait(dqp)) {
/*
* The dquot is already being flushed. It may have been
* flushed delayed write, however, and we don't want to
* get stuck waiting for that to complete. So, we want to check
* to see if we can lock the dquot's buffer without sleeping.
* If we can and it is marked for delayed write, then we
* hold it and send it out from the push routine. We don't
* want to do that now since we might sleep in the device
* strategy routine. We also don't want to grab the buffer lock
* here because we'd like not to call into the buffer cache
* while holding the AIL_LOCK.
* Make sure to only return PUSHBUF if we set pushbuf_flag
* ourselves. If someone else is doing it then we don't
* want to go to the push routine and duplicate their efforts.
*/
if (qip->qli_pushbuf_flag == 0) {
qip->qli_pushbuf_flag = 1;
ASSERT(qip->qli_format.qlf_blkno == dqp->q_blkno);
#ifdef DEBUG
qip->qli_push_owner = get_thread_id();
#endif
/*
* The dquot is left locked.
*/
retval = XFS_ITEM_PUSHBUF;
} else {
retval = XFS_ITEM_FLUSHING;
xfs_dqunlock_nonotify(dqp);
}
}
ASSERT(qip->qli_item.li_flags & XFS_LI_IN_AIL);
return (retval);
}
/*
* 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(
xfs_dq_logitem_t *ql)
{
xfs_dquot_t *dqp;
ASSERT(ql != NULL);
dqp = ql->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);
}
/*
* The transaction with the dquot locked has aborted. The dquot
* must not be dirty within the transaction. We simply unlock just
* as if the transaction had been cancelled.
*/
STATIC void
xfs_qm_dquot_logitem_abort(
xfs_dq_logitem_t *ql)
{
xfs_qm_dquot_logitem_unlock(ql);
}
/*
* 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
*/
/* ARGSUSED */
STATIC void
xfs_qm_dquot_logitem_committing(
xfs_dq_logitem_t *l,
xfs_lsn_t lsn)
{
return;
}
/*
* This is the ops vector for dquots
*/
struct xfs_item_ops xfs_dquot_item_ops = {
iop_size: (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_size,
iop_format: (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
xfs_qm_dquot_logitem_format,
iop_pin: (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
iop_unpin: (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unpin,
iop_unpin_remove: (void(*)(xfs_log_item_t*, xfs_trans_t*))
xfs_qm_dquot_logitem_unpin_remove,
iop_trylock: (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_trylock,
iop_unlock: (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unlock,
iop_committed: (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
xfs_qm_dquot_logitem_committed,
iop_push: (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_push,
iop_abort: (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_abort,
iop_pushbuf: (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pushbuf,
iop_committing: (void(*)(xfs_log_item_t*, xfs_lsn_t))
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)
{
xfs_dq_logitem_t *lp;
lp = &dqp->q_logitem;
lp->qli_item.li_type = XFS_LI_DQUOT;
lp->qli_item.li_ops = &xfs_dquot_item_ops;
lp->qli_item.li_mountp = dqp->q_mount;
lp->qli_dquot = dqp;
lp->qli_format.qlf_type = XFS_LI_DQUOT;
lp->qli_format.qlf_id = INT_GET(dqp->q_core.d_id, ARCH_CONVERT);
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 -------------------*/
/*
* 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.
*/
/*ARGSUSED*/
STATIC uint
xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t *qf)
{
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(xfs_qoff_logitem_t *qf,
xfs_log_iovec_t *log_vector)
{
ASSERT(qf->qql_format.qf_type == XFS_LI_QUOTAOFF);
log_vector->i_addr = (xfs_caddr_t)&(qf->qql_format);
log_vector->i_len = sizeof(xfs_qoff_logitem_t);
qf->qql_format.qf_size = 1;
}
/*
* Pinning has no meaning for an quotaoff item, so just return.
*/
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
{
return;
}
/*
* Since pinning has no meaning for an quotaoff item, unpinning does
* not either.
*/
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf)
{
return;
}
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t *qf, xfs_trans_t *tp)
{
return;
}
/*
* Quotaoff items have no locking, so just return success.
*/
/*ARGSUSED*/
STATIC uint
xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t *qf)
{
return XFS_ITEM_LOCKED;
}
/*
* Quotaoff items have no locking or pushing, so return failure
* so that the caller doesn't bother with us.
*/
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t *qf)
{
return;
}
/*
* 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.
*/
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t *qf, xfs_lsn_t lsn)
{
return (lsn);
}
/*
* The transaction of which this QUOTAOFF is a part has been aborted.
* Just clean up after ourselves.
* Shouldn't this never happen in the case of qoffend logitems? XXX
*/
STATIC void
xfs_qm_qoff_logitem_abort(xfs_qoff_logitem_t *qf)
{
kmem_free(qf, sizeof(xfs_qoff_logitem_t));
}
/*
* 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.
*/
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t *qf)
{
return;
}
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_qoffend_logitem_committed(
xfs_qoff_logitem_t *qfe,
xfs_lsn_t lsn)
{
xfs_qoff_logitem_t *qfs;
SPLDECL(s);
qfs = qfe->qql_start_lip;
AIL_LOCK(qfs->qql_item.li_mountp,s);
/*
* Delete the qoff-start logitem from the AIL.
* xfs_trans_delete_ail() drops the AIL lock.
*/
xfs_trans_delete_ail(qfs->qql_item.li_mountp, (xfs_log_item_t *)qfs, s);
kmem_free(qfs, sizeof(xfs_qoff_logitem_t));
kmem_free(qfe, sizeof(xfs_qoff_logitem_t));
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.
*/
/* ARGSUSED */
STATIC void
xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
{
return;
}
/* ARGSUSED */
STATIC void
xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
{
return;
}
struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
iop_size: (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
iop_format: (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
xfs_qm_qoff_logitem_format,
iop_pin: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
iop_unpin: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unpin,
iop_unpin_remove: (void(*)(xfs_log_item_t*,xfs_trans_t*))
xfs_qm_qoff_logitem_unpin_remove,
iop_trylock: (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
iop_unlock: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
iop_committed: (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
xfs_qm_qoffend_logitem_committed,
iop_push: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
iop_abort: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
iop_pushbuf: NULL,
iop_committing: (void(*)(xfs_log_item_t*, xfs_lsn_t))
xfs_qm_qoffend_logitem_committing
};
/*
* This is the ops vector shared by all quotaoff-start log items.
*/
struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
iop_size: (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
iop_format: (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
xfs_qm_qoff_logitem_format,
iop_pin: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
iop_unpin: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unpin,
iop_unpin_remove: (void(*)(xfs_log_item_t*,xfs_trans_t*))
xfs_qm_qoff_logitem_unpin_remove,
iop_trylock: (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
iop_unlock: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
iop_committed: (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
xfs_qm_qoff_logitem_committed,
iop_push: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
iop_abort: (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
iop_pushbuf: NULL,
iop_committing: (void(*)(xfs_log_item_t*, xfs_lsn_t))
xfs_qm_qoff_logitem_committing
};
/*
* Allocate and initialize an quotaoff item of the correct quota type(s).
*/
xfs_qoff_logitem_t *
xfs_qm_qoff_logitem_init(
struct xfs_mount *mp,
xfs_qoff_logitem_t *start,
uint flags)
{
xfs_qoff_logitem_t *qf;
qf = (xfs_qoff_logitem_t*) kmem_zalloc(sizeof(xfs_qoff_logitem_t), KM_SLEEP);
qf->qql_item.li_type = XFS_LI_QUOTAOFF;
if (start)
qf->qql_item.li_ops = &xfs_qm_qoffend_logitem_ops;
else
qf->qql_item.li_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);
}
|