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/*
* 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>
#ifdef XFS_TRANS_DEBUG
STATIC void
xfs_trans_inode_broot_debug(
xfs_inode_t *ip);
#else
#define xfs_trans_inode_broot_debug(ip)
#endif
/*
* Get and lock the inode for the caller if it is not already
* locked within the given transaction. If it is already locked
* within the transaction, just increment its lock recursion count
* and return a pointer to it.
*
* For an inode to be locked in a transaction, the inode lock, as
* opposed to the io lock, must be taken exclusively. This ensures
* that the inode can be involved in only 1 transaction at a time.
* Lock recursion is handled on the io lock, but only for lock modes
* of equal or lesser strength. That is, you can recur on the io lock
* held EXCL with a SHARED request but not vice versa. Also, if
* the inode is already a part of the transaction then you cannot
* go from not holding the io lock to having it EXCL or SHARED.
*
* Use the inode cache routine xfs_inode_incore() to find the inode
* if it is already owned by this transaction.
*
* If we don't already own the inode, use xfs_iget() to get it.
* Since the inode log item structure is embedded in the incore
* inode structure and is initialized when the inode is brought
* into memory, there is nothing to do with it here.
*
* If the given transaction pointer is NULL, just call xfs_iget().
* This simplifies code which must handle both cases.
*/
int
xfs_trans_iget(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_ino_t ino,
uint lock_flags,
xfs_inode_t **ipp)
{
int error;
xfs_inode_t *ip;
xfs_inode_log_item_t *iip;
/*
* If the transaction pointer is NULL, just call the normal
* xfs_iget().
*/
if (tp == NULL) {
return (xfs_iget(mp, NULL, ino, lock_flags, ipp, 0));
}
/*
* If we find the inode in core with this transaction
* pointer in its i_transp field, then we know we already
* have it locked. In this case we just increment the lock
* recursion count and return the inode to the caller.
* Assert that the inode is already locked in the mode requested
* by the caller. We cannot do lock promotions yet, so
* die if someone gets this wrong.
*/
if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) {
/*
* Make sure that the inode lock is held EXCL and
* that the io lock is never upgraded when the inode
* is already a part of the transaction.
*/
ASSERT(ip->i_itemp != NULL);
ASSERT(lock_flags & XFS_ILOCK_EXCL);
ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
ismrlocked(&ip->i_iolock, MR_UPDATE));
ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
(ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL));
ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
ismrlocked(&ip->i_iolock, (MR_UPDATE | MR_ACCESS)));
ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
(ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY));
if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
ip->i_itemp->ili_iolock_recur++;
}
if (lock_flags & XFS_ILOCK_EXCL) {
ip->i_itemp->ili_ilock_recur++;
}
*ipp = ip;
return 0;
}
ASSERT(lock_flags & XFS_ILOCK_EXCL);
error = xfs_iget(tp->t_mountp, tp, ino, lock_flags, &ip, 0);
if (error) {
return error;
}
ASSERT(ip != NULL);
/*
* Get a log_item_desc to point at the new item.
*/
if (ip->i_itemp == NULL)
xfs_inode_item_init(ip, mp);
iip = ip->i_itemp;
(void) xfs_trans_add_item(tp, (xfs_log_item_t *)(iip));
xfs_trans_inode_broot_debug(ip);
/*
* If the IO lock has been acquired, mark that in
* the inode log item so we'll know to unlock it
* when the transaction commits.
*/
ASSERT(iip->ili_flags == 0);
if (lock_flags & XFS_IOLOCK_EXCL) {
iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
} else if (lock_flags & XFS_IOLOCK_SHARED) {
iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
}
/*
* Initialize i_transp so we can find it with xfs_inode_incore()
* above.
*/
ip->i_transp = tp;
*ipp = ip;
return 0;
}
/*
* Release the inode ip which was previously acquired with xfs_trans_iget()
* or added with xfs_trans_ijoin(). This will decrement the lock
* recursion count of the inode item. If the count goes to less than 0,
* the inode will be unlocked and disassociated from the transaction.
*
* If the inode has been modified within the transaction, it will not be
* unlocked until the transaction commits.
*/
void
xfs_trans_iput(
xfs_trans_t *tp,
xfs_inode_t *ip,
uint lock_flags)
{
xfs_inode_log_item_t *iip;
xfs_log_item_desc_t *lidp;
/*
* If the transaction pointer is NULL, just call xfs_iput().
*/
if (tp == NULL) {
xfs_iput(ip, lock_flags);
}
ASSERT(ip->i_transp == tp);
iip = ip->i_itemp;
ASSERT(iip != NULL);
/*
* Find the item descriptor pointing to this inode's
* log item. It must be there.
*/
lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)iip);
ASSERT(lidp != NULL);
ASSERT(lidp->lid_item == (xfs_log_item_t*)iip);
/*
* Be consistent about the bookkeeping for the inode's
* io lock, but it doesn't mean much really.
*/
ASSERT((iip->ili_flags & XFS_ILI_IOLOCKED_ANY) != XFS_ILI_IOLOCKED_ANY);
if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) {
ASSERT(iip->ili_flags & XFS_ILI_IOLOCKED_ANY);
ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
(iip->ili_flags & XFS_ILI_IOLOCKED_EXCL));
ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
(iip->ili_flags &
(XFS_ILI_IOLOCKED_EXCL | XFS_ILI_IOLOCKED_SHARED)));
if (iip->ili_iolock_recur > 0) {
iip->ili_iolock_recur--;
}
}
/*
* If the release is just for a recursive lock on the inode lock,
* then decrement the count and return. We can assert that
* the caller is dropping an EXCL lock on the inode, because
* inode must be locked EXCL within transactions.
*/
ASSERT(lock_flags & XFS_ILOCK_EXCL);
if (iip->ili_ilock_recur > 0) {
iip->ili_ilock_recur--;
return;
}
ASSERT(iip->ili_iolock_recur == 0);
/*
* If the inode was dirtied within this transaction, it cannot
* be released until the transaction commits.
*/
if (lidp->lid_flags & XFS_LID_DIRTY) {
return;
}
xfs_trans_free_item(tp, lidp);
/*
* Clear the hold and iolocked flags in the inode log item.
* We wouldn't want the next user of the inode to
* get confused. Assert that if the iolocked flag is set
* in the item then we are unlocking it in the call to xfs_iput()
* below.
*/
ASSERT((!(iip->ili_flags & XFS_ILI_IOLOCKED_ANY)) ||
(lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)));
if (iip->ili_flags & (XFS_ILI_HOLD | XFS_ILI_IOLOCKED_ANY)) {
iip->ili_flags &= ~(XFS_ILI_HOLD | XFS_ILI_IOLOCKED_ANY);
}
/*
* Unlike xfs_brelse() the inode log item cannot be
* freed, because it is embedded within the inode.
* All we have to do is release the inode.
*/
xfs_iput(ip, lock_flags);
return;
}
/*
* Add the locked inode to the transaction.
* The inode must be locked, and it cannot be associated with any
* transaction. The caller must specify the locks already held
* on the inode.
*/
void
xfs_trans_ijoin(
xfs_trans_t *tp,
xfs_inode_t *ip,
uint lock_flags)
{
xfs_inode_log_item_t *iip;
ASSERT(ip->i_transp == NULL);
ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
ASSERT(lock_flags & XFS_ILOCK_EXCL);
if (ip->i_itemp == NULL)
xfs_inode_item_init(ip, ip->i_mount);
iip = ip->i_itemp;
ASSERT(iip->ili_flags == 0);
ASSERT(iip->ili_ilock_recur == 0);
ASSERT(iip->ili_iolock_recur == 0);
/*
* Get a log_item_desc to point at the new item.
*/
(void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip));
xfs_trans_inode_broot_debug(ip);
/*
* If the IO lock is already held, mark that in the inode log item.
*/
if (lock_flags & XFS_IOLOCK_EXCL) {
iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
} else if (lock_flags & XFS_IOLOCK_SHARED) {
iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
}
/*
* Initialize i_transp so we can find it with xfs_inode_incore()
* in xfs_trans_iget() above.
*/
ip->i_transp = tp;
}
/*
* Mark the inode as not needing to be unlocked when the inode item's
* IOP_UNLOCK() routine is called. The inode must already be locked
* and associated with the given transaction.
*/
/*ARGSUSED*/
void
xfs_trans_ihold(
xfs_trans_t *tp,
xfs_inode_t *ip)
{
ASSERT(ip->i_transp == tp);
ASSERT(ip->i_itemp != NULL);
ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
}
/*
* Cancel the previous inode hold request made on this inode
* for this transaction.
*/
/*ARGSUSED*/
void
xfs_trans_ihold_release(
xfs_trans_t *tp,
xfs_inode_t *ip)
{
ASSERT(ip->i_transp == tp);
ASSERT(ip->i_itemp != NULL);
ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
ASSERT(ip->i_itemp->ili_flags & XFS_ILI_HOLD);
ip->i_itemp->ili_flags &= ~XFS_ILI_HOLD;
}
/*
* This is called to mark the fields indicated in fieldmask as needing
* to be logged when the transaction is committed. The inode must
* already be associated with the given transaction.
*
* The values for fieldmask are defined in xfs_inode_item.h. We always
* log all of the core inode if any of it has changed, and we always log
* all of the inline data/extents/b-tree root if any of them has changed.
*/
void
xfs_trans_log_inode(
xfs_trans_t *tp,
xfs_inode_t *ip,
uint flags)
{
xfs_log_item_desc_t *lidp;
ASSERT(ip->i_transp == tp);
ASSERT(ip->i_itemp != NULL);
ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp));
ASSERT(lidp != NULL);
tp->t_flags |= XFS_TRANS_DIRTY;
lidp->lid_flags |= XFS_LID_DIRTY;
/*
* Always OR in the bits from the ili_last_fields field.
* This is to coordinate with the xfs_iflush() and xfs_iflush_done()
* routines in the eventual clearing of the ilf_fields bits.
* See the big comment in xfs_iflush() for an explanation of
* this coorination mechanism.
*/
flags |= ip->i_itemp->ili_last_fields;
ip->i_itemp->ili_format.ilf_fields |= flags;
}
#ifdef XFS_TRANS_DEBUG
/*
* Keep track of the state of the inode btree root to make sure we
* log it properly.
*/
STATIC void
xfs_trans_inode_broot_debug(
xfs_inode_t *ip)
{
xfs_inode_log_item_t *iip;
ASSERT(ip->i_itemp != NULL);
iip = ip->i_itemp;
if (iip->ili_root_size != 0) {
ASSERT(iip->ili_orig_root != NULL);
kmem_free(iip->ili_orig_root, iip->ili_root_size);
iip->ili_root_size = 0;
iip->ili_orig_root = NULL;
}
if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
ASSERT((ip->i_df.if_broot != NULL) &&
(ip->i_df.if_broot_bytes > 0));
iip->ili_root_size = ip->i_df.if_broot_bytes;
iip->ili_orig_root =
(char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
bcopy((char*)(ip->i_df.if_broot), iip->ili_orig_root,
iip->ili_root_size);
}
}
#endif
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