xfs_inode_item.c

linux 内核源代码

			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
			vecp++;
			nvecs++;
			iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
		}
		break;

	case XFS_DINODE_FMT_LOCAL:
		ASSERT(!(iip->ili_format.ilf_fields &
			 (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
			  XFS_ILOG_DEV | XFS_ILOG_UUID)));
		if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
			ASSERT(ip->i_df.if_bytes > 0);
			ASSERT(ip->i_df.if_u1.if_data != NULL);
			ASSERT(ip->i_d.di_size > 0);

			vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
			/*
			 * Round i_bytes up to a word boundary.
			 * The underlying memory is guaranteed to
			 * to be there by xfs_idata_realloc().
			 */
			data_bytes = roundup(ip->i_df.if_bytes, 4);
			ASSERT((ip->i_df.if_real_bytes == 0) ||
			       (ip->i_df.if_real_bytes == data_bytes));
			vecp->i_len = (int)data_bytes;
			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
			vecp++;
			nvecs++;
			iip->ili_format.ilf_dsize = (unsigned)data_bytes;
		}
		break;

	case XFS_DINODE_FMT_DEV:
		ASSERT(!(iip->ili_format.ilf_fields &
			 (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
			  XFS_ILOG_DDATA | XFS_ILOG_UUID)));
		if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
			iip->ili_format.ilf_u.ilfu_rdev =
				ip->i_df.if_u2.if_rdev;
		}
		break;

	case XFS_DINODE_FMT_UUID:
		ASSERT(!(iip->ili_format.ilf_fields &
			 (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
			  XFS_ILOG_DDATA | XFS_ILOG_DEV)));
		if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
			iip->ili_format.ilf_u.ilfu_uuid =
				ip->i_df.if_u2.if_uuid;
		}
		break;

	default:
		ASSERT(0);
		break;
	}

	/*
	 * If there are no attributes associated with the file,
	 * then we're done.
	 * Assert that no attribute-related log flags are set.
	 */
	if (!XFS_IFORK_Q(ip)) {
		ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
		iip->ili_format.ilf_size = nvecs;
		ASSERT(!(iip->ili_format.ilf_fields &
			 (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
		return;
	}

	switch (ip->i_d.di_aformat) {
	case XFS_DINODE_FMT_EXTENTS:
		ASSERT(!(iip->ili_format.ilf_fields &
			 (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
		if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
			ASSERT(ip->i_afp->if_bytes > 0);
			ASSERT(ip->i_afp->if_u1.if_extents != NULL);
			ASSERT(ip->i_d.di_anextents > 0);
#ifdef DEBUG
			nrecs = ip->i_afp->if_bytes /
				(uint)sizeof(xfs_bmbt_rec_t);
#endif
			ASSERT(nrecs > 0);
			ASSERT(nrecs == ip->i_d.di_anextents);
#ifdef XFS_NATIVE_HOST
			/*
			 * There are not delayed allocation extents
			 * for attributes, so just point at the array.
			 */
			vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
			vecp->i_len = ip->i_afp->if_bytes;
#else
			ASSERT(iip->ili_aextents_buf == NULL);
			/*
			 * Need to endian flip before logging
			 */
			ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
				KM_SLEEP);
			iip->ili_aextents_buf = ext_buffer;
			vecp->i_addr = (xfs_caddr_t)ext_buffer;
			vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
					XFS_ATTR_FORK);
#endif
			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
			iip->ili_format.ilf_asize = vecp->i_len;
			vecp++;
			nvecs++;
		}
		break;

	case XFS_DINODE_FMT_BTREE:
		ASSERT(!(iip->ili_format.ilf_fields &
			 (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
		if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
			ASSERT(ip->i_afp->if_broot_bytes > 0);
			ASSERT(ip->i_afp->if_broot != NULL);
			vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
			vecp->i_len = ip->i_afp->if_broot_bytes;
			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
			vecp++;
			nvecs++;
			iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
		}
		break;

	case XFS_DINODE_FMT_LOCAL:
		ASSERT(!(iip->ili_format.ilf_fields &
			 (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
		if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
			ASSERT(ip->i_afp->if_bytes > 0);
			ASSERT(ip->i_afp->if_u1.if_data != NULL);

			vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
			/*
			 * Round i_bytes up to a word boundary.
			 * The underlying memory is guaranteed to
			 * to be there by xfs_idata_realloc().
			 */
			data_bytes = roundup(ip->i_afp->if_bytes, 4);
			ASSERT((ip->i_afp->if_real_bytes == 0) ||
			       (ip->i_afp->if_real_bytes == data_bytes));
			vecp->i_len = (int)data_bytes;
			XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
			vecp++;
			nvecs++;
			iip->ili_format.ilf_asize = (unsigned)data_bytes;
		}
		break;

	default:
		ASSERT(0);
		break;
	}

	ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
	iip->ili_format.ilf_size = nvecs;
}


/*
 * This is called to pin the inode associated with the inode log
 * item in memory so it cannot be written out.  Do this by calling
 * xfs_ipin() to bump the pin count in the inode while holding the
 * inode pin lock.
 */
STATIC void
xfs_inode_item_pin(
	xfs_inode_log_item_t	*iip)
{
	ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
	xfs_ipin(iip->ili_inode);
}


/*
 * This is called to unpin the inode associated with the inode log
 * item which was previously pinned with a call to xfs_inode_item_pin().
 * Just call xfs_iunpin() on the inode to do this.
 */
/* ARGSUSED */
STATIC void
xfs_inode_item_unpin(
	xfs_inode_log_item_t	*iip,
	int			stale)
{
	xfs_iunpin(iip->ili_inode);
}

/* ARGSUSED */
STATIC void
xfs_inode_item_unpin_remove(
	xfs_inode_log_item_t	*iip,
	xfs_trans_t		*tp)
{
	xfs_iunpin(iip->ili_inode);
}

/*
 * This is called to attempt to lock the inode associated with this
 * inode log item, in preparation for the push routine which does the actual
 * iflush.  Don't sleep on the inode lock or the flush lock.
 *
 * If the flush lock is already held, indicating that the inode has
 * been or is in the process of being flushed, then (ideally) we'd like to
 * see if the inode's buffer is still incore, and if so give it a nudge.
 * We delay doing so until the pushbuf routine, though, to avoid holding
 * the AIL lock across a call to the blackhole which is the buffer cache.
 * Also we don't want to sleep in any device strategy routines, which can happen
 * if we do the subsequent bawrite in here.
 */
STATIC uint
xfs_inode_item_trylock(
	xfs_inode_log_item_t	*iip)
{
	register xfs_inode_t	*ip;

	ip = iip->ili_inode;

	if (xfs_ipincount(ip) > 0) {
		return XFS_ITEM_PINNED;
	}

	if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
		return XFS_ITEM_LOCKED;
	}

	if (!xfs_iflock_nowait(ip)) {
		/*
		 * If someone else isn't already trying to push the inode
		 * buffer, we get to do it.
		 */
		if (iip->ili_pushbuf_flag == 0) {
			iip->ili_pushbuf_flag = 1;
#ifdef DEBUG
			iip->ili_push_owner = current_pid();
#endif
			/*
			 * Inode is left locked in shared mode.
			 * Pushbuf routine gets to unlock it.
			 */
			return XFS_ITEM_PUSHBUF;
		} else {
			/*
			 * We hold the AIL_LOCK, so we must specify the
			 * NONOTIFY flag so that we won't double trip.
			 */
			xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
			return XFS_ITEM_FLUSHING;
		}
		/* NOTREACHED */
	}

	/* Stale items should force out the iclog */
	if (ip->i_flags & XFS_ISTALE) {
		xfs_ifunlock(ip);
		xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
		return XFS_ITEM_PINNED;
	}

#ifdef DEBUG
	if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
		ASSERT(iip->ili_format.ilf_fields != 0);
		ASSERT(iip->ili_logged == 0);
		ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
	}
#endif
	return XFS_ITEM_SUCCESS;
}

/*
 * Unlock the inode associated with the inode log item.
 * Clear the fields of the inode and inode log item that
 * are specific to the current transaction.  If the
 * hold flags is set, do not unlock the inode.
 */
STATIC void
xfs_inode_item_unlock(
	xfs_inode_log_item_t	*iip)
{
	uint		hold;
	uint		iolocked;
	uint		lock_flags;
	xfs_inode_t	*ip;

	ASSERT(iip != NULL);
	ASSERT(iip->ili_inode->i_itemp != NULL);
	ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
	ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
		  XFS_ILI_IOLOCKED_EXCL)) ||
	       ismrlocked(&(iip->ili_inode->i_iolock), MR_UPDATE));
	ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
		  XFS_ILI_IOLOCKED_SHARED)) ||
	       ismrlocked(&(iip->ili_inode->i_iolock), MR_ACCESS));
	/*
	 * Clear the transaction pointer in the inode.
	 */
	ip = iip->ili_inode;
	ip->i_transp = NULL;

	/*
	 * If the inode needed a separate buffer with which to log
	 * its extents, then free it now.
	 */
	if (iip->ili_extents_buf != NULL) {
		ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
		ASSERT(ip->i_d.di_nextents > 0);
		ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
		ASSERT(ip->i_df.if_bytes > 0);
		kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes);
		iip->ili_extents_buf = NULL;
	}
	if (iip->ili_aextents_buf != NULL) {
		ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
		ASSERT(ip->i_d.di_anextents > 0);
		ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
		ASSERT(ip->i_afp->if_bytes > 0);
		kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes);
		iip->ili_aextents_buf = NULL;
	}

	/*
	 * Figure out if we should unlock the inode or not.
	 */
	hold = iip->ili_flags & XFS_ILI_HOLD;

	/*
	 * Before clearing out the flags, remember whether we
	 * are holding the inode's IO lock.
	 */
	iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;

	/*
	 * Clear out the fields of the inode log item particular
	 * to the current transaction.
	 */
	iip->ili_ilock_recur = 0;
	iip->ili_iolock_recur = 0;
	iip->ili_flags = 0;

	/*
	 * Unlock the inode if XFS_ILI_HOLD was not set.
	 */
	if (!hold) {
		lock_flags = XFS_ILOCK_EXCL;
		if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
			lock_flags |= XFS_IOLOCK_EXCL;
		} else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
			lock_flags |= XFS_IOLOCK_SHARED;
		}
		xfs_iput(iip->ili_inode, lock_flags);
	}
}

/*
 * This is called to find out where the oldest active copy of the
 * inode log item in the on disk log resides now that the last log
 * write of it completed at the given lsn.  Since we always re-log
 * all dirty data in an inode, the latest copy in the on disk log
 * is the only one that matters.  Therefore, simply return the
 * given lsn.
 */
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_inode_item_committed(
	xfs_inode_log_item_t	*iip,
	xfs_lsn_t		lsn)
{
	return (lsn);
}

/*
 * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK