diff options
Diffstat (limited to 'fs/xfs/xfs_dquot_item.c')
| -rw-r--r-- | fs/xfs/xfs_dquot_item.c | 529 |
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; +} |