311 lines
8.6 KiB
C
311 lines
8.6 KiB
C
/*
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* Copyright (c) 2000,2005 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_types.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_dir.h"
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#include "xfs_dir2.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_dir_sf.h"
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#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_ialloc.h"
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#include "xfs_trans_priv.h"
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#include "xfs_inode_item.h"
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#ifdef XFS_TRANS_DEBUG
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STATIC void
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xfs_trans_inode_broot_debug(
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xfs_inode_t *ip);
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#else
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#define xfs_trans_inode_broot_debug(ip)
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#endif
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/*
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* Get and lock the inode for the caller if it is not already
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* locked within the given transaction. If it is already locked
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* within the transaction, just increment its lock recursion count
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* and return a pointer to it.
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*
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* For an inode to be locked in a transaction, the inode lock, as
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* opposed to the io lock, must be taken exclusively. This ensures
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* that the inode can be involved in only 1 transaction at a time.
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* Lock recursion is handled on the io lock, but only for lock modes
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* of equal or lesser strength. That is, you can recur on the io lock
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* held EXCL with a SHARED request but not vice versa. Also, if
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* the inode is already a part of the transaction then you cannot
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* go from not holding the io lock to having it EXCL or SHARED.
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*
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* Use the inode cache routine xfs_inode_incore() to find the inode
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* if it is already owned by this transaction.
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*
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* If we don't already own the inode, use xfs_iget() to get it.
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* Since the inode log item structure is embedded in the incore
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* inode structure and is initialized when the inode is brought
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* into memory, there is nothing to do with it here.
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*
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* If the given transaction pointer is NULL, just call xfs_iget().
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* This simplifies code which must handle both cases.
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*/
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int
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xfs_trans_iget(
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xfs_mount_t *mp,
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xfs_trans_t *tp,
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xfs_ino_t ino,
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uint flags,
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uint lock_flags,
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xfs_inode_t **ipp)
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{
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int error;
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xfs_inode_t *ip;
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xfs_inode_log_item_t *iip;
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/*
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* If the transaction pointer is NULL, just call the normal
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* xfs_iget().
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*/
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if (tp == NULL)
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return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0);
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/*
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* If we find the inode in core with this transaction
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* pointer in its i_transp field, then we know we already
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* have it locked. In this case we just increment the lock
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* recursion count and return the inode to the caller.
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* Assert that the inode is already locked in the mode requested
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* by the caller. We cannot do lock promotions yet, so
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* die if someone gets this wrong.
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*/
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if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) {
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/*
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* Make sure that the inode lock is held EXCL and
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* that the io lock is never upgraded when the inode
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* is already a part of the transaction.
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*/
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ASSERT(ip->i_itemp != NULL);
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ASSERT(lock_flags & XFS_ILOCK_EXCL);
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ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
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ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
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ismrlocked(&ip->i_iolock, MR_UPDATE));
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ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
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(ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL));
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ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
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ismrlocked(&ip->i_iolock, (MR_UPDATE | MR_ACCESS)));
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ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
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(ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY));
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if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
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ip->i_itemp->ili_iolock_recur++;
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}
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if (lock_flags & XFS_ILOCK_EXCL) {
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ip->i_itemp->ili_ilock_recur++;
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}
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*ipp = ip;
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return 0;
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}
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ASSERT(lock_flags & XFS_ILOCK_EXCL);
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error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0);
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if (error) {
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return error;
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}
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ASSERT(ip != NULL);
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/*
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* Get a log_item_desc to point at the new item.
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*/
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if (ip->i_itemp == NULL)
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xfs_inode_item_init(ip, mp);
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iip = ip->i_itemp;
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(void) xfs_trans_add_item(tp, (xfs_log_item_t *)(iip));
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xfs_trans_inode_broot_debug(ip);
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/*
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* If the IO lock has been acquired, mark that in
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* the inode log item so we'll know to unlock it
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* when the transaction commits.
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*/
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ASSERT(iip->ili_flags == 0);
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if (lock_flags & XFS_IOLOCK_EXCL) {
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iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
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} else if (lock_flags & XFS_IOLOCK_SHARED) {
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iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
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}
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/*
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* Initialize i_transp so we can find it with xfs_inode_incore()
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* above.
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*/
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ip->i_transp = tp;
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*ipp = ip;
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return 0;
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}
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/*
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* Add the locked inode to the transaction.
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* The inode must be locked, and it cannot be associated with any
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* transaction. The caller must specify the locks already held
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* on the inode.
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*/
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void
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xfs_trans_ijoin(
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xfs_trans_t *tp,
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xfs_inode_t *ip,
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uint lock_flags)
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{
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xfs_inode_log_item_t *iip;
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ASSERT(ip->i_transp == NULL);
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ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
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ASSERT(lock_flags & XFS_ILOCK_EXCL);
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if (ip->i_itemp == NULL)
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xfs_inode_item_init(ip, ip->i_mount);
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iip = ip->i_itemp;
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ASSERT(iip->ili_flags == 0);
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ASSERT(iip->ili_ilock_recur == 0);
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ASSERT(iip->ili_iolock_recur == 0);
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/*
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* Get a log_item_desc to point at the new item.
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*/
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(void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip));
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xfs_trans_inode_broot_debug(ip);
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/*
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* If the IO lock is already held, mark that in the inode log item.
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*/
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if (lock_flags & XFS_IOLOCK_EXCL) {
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iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
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} else if (lock_flags & XFS_IOLOCK_SHARED) {
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iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
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}
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/*
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* Initialize i_transp so we can find it with xfs_inode_incore()
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* in xfs_trans_iget() above.
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*/
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ip->i_transp = tp;
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}
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/*
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* Mark the inode as not needing to be unlocked when the inode item's
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* IOP_UNLOCK() routine is called. The inode must already be locked
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* and associated with the given transaction.
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*/
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/*ARGSUSED*/
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void
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xfs_trans_ihold(
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xfs_trans_t *tp,
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xfs_inode_t *ip)
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{
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ASSERT(ip->i_transp == tp);
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ASSERT(ip->i_itemp != NULL);
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ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
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ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
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}
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/*
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* This is called to mark the fields indicated in fieldmask as needing
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* to be logged when the transaction is committed. The inode must
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* already be associated with the given transaction.
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*
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* The values for fieldmask are defined in xfs_inode_item.h. We always
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* log all of the core inode if any of it has changed, and we always log
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* all of the inline data/extents/b-tree root if any of them has changed.
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*/
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void
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xfs_trans_log_inode(
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xfs_trans_t *tp,
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xfs_inode_t *ip,
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uint flags)
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{
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xfs_log_item_desc_t *lidp;
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ASSERT(ip->i_transp == tp);
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ASSERT(ip->i_itemp != NULL);
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ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
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lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp));
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ASSERT(lidp != NULL);
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tp->t_flags |= XFS_TRANS_DIRTY;
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lidp->lid_flags |= XFS_LID_DIRTY;
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/*
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* Always OR in the bits from the ili_last_fields field.
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* This is to coordinate with the xfs_iflush() and xfs_iflush_done()
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* routines in the eventual clearing of the ilf_fields bits.
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* See the big comment in xfs_iflush() for an explanation of
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* this coorination mechanism.
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*/
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flags |= ip->i_itemp->ili_last_fields;
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ip->i_itemp->ili_format.ilf_fields |= flags;
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}
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#ifdef XFS_TRANS_DEBUG
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/*
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* Keep track of the state of the inode btree root to make sure we
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* log it properly.
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*/
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STATIC void
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xfs_trans_inode_broot_debug(
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xfs_inode_t *ip)
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{
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xfs_inode_log_item_t *iip;
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ASSERT(ip->i_itemp != NULL);
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iip = ip->i_itemp;
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if (iip->ili_root_size != 0) {
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ASSERT(iip->ili_orig_root != NULL);
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kmem_free(iip->ili_orig_root, iip->ili_root_size);
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iip->ili_root_size = 0;
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iip->ili_orig_root = NULL;
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}
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if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
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ASSERT((ip->i_df.if_broot != NULL) &&
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(ip->i_df.if_broot_bytes > 0));
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iip->ili_root_size = ip->i_df.if_broot_bytes;
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iip->ili_orig_root =
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(char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
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memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
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iip->ili_root_size);
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}
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}
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#endif
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