patch-2.4.25 linux-2.4.25/fs/xfs/xfs_trans_item.c

• Lines: 562
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_trans_item.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_trans_item.c linux-2.4.25/fs/xfs/xfs_trans_item.c
@@ -0,0 +1,561 @@
+/*
+ * Copyright (c) 2000-2002 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_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+
+STATIC int	xfs_trans_unlock_chunk(xfs_log_item_chunk_t *,
+					int, int, xfs_lsn_t);
+
+/*
+ * This is called to add the given log item to the transaction's
+ * list of log items.  It must find a free log item descriptor
+ * or allocate a new one and add the item to that descriptor.
+ * The function returns a pointer to item descriptor used to point
+ * to the new item.  The log item will now point to its new descriptor
+ * with its li_desc field.
+ */
+xfs_log_item_desc_t *
+xfs_trans_add_item(xfs_trans_t *tp, xfs_log_item_t *lip)
+{
+	xfs_log_item_desc_t	*lidp;
+	xfs_log_item_chunk_t	*licp;
+	int			i=0;
+
+	/*
+	 * If there are no free descriptors, allocate a new chunk
+	 * of them and put it at the front of the chunk list.
+	 */
+	if (tp->t_items_free == 0) {
+		licp = (xfs_log_item_chunk_t*)
+		       kmem_alloc(sizeof(xfs_log_item_chunk_t), KM_SLEEP);
+		ASSERT(licp != NULL);
+		/*
+		 * Initialize the chunk, and then
+		 * claim the first slot in the newly allocated chunk.
+		 */
+		XFS_LIC_INIT(licp);
+		XFS_LIC_CLAIM(licp, 0);
+		licp->lic_unused = 1;
+		XFS_LIC_INIT_SLOT(licp, 0);
+		lidp = XFS_LIC_SLOT(licp, 0);
+
+		/*
+		 * Link in the new chunk and update the free count.
+		 */
+		licp->lic_next = tp->t_items.lic_next;
+		tp->t_items.lic_next = licp;
+		tp->t_items_free = XFS_LIC_NUM_SLOTS - 1;
+
+		/*
+		 * Initialize the descriptor and the generic portion
+		 * of the log item.
+		 *
+		 * Point the new slot at this item and return it.
+		 * Also point the log item at its currently active
+		 * descriptor and set the item's mount pointer.
+		 */
+		lidp->lid_item = lip;
+		lidp->lid_flags = 0;
+		lidp->lid_size = 0;
+		lip->li_desc = lidp;
+		lip->li_mountp = tp->t_mountp;
+		return (lidp);
+	}
+
+	/*
+	 * Find the free descriptor. It is somewhere in the chunklist
+	 * of descriptors.
+	 */
+	licp = &tp->t_items;
+	while (licp != NULL) {
+		if (XFS_LIC_VACANCY(licp)) {
+			if (licp->lic_unused <= XFS_LIC_MAX_SLOT) {
+				i = licp->lic_unused;
+				ASSERT(XFS_LIC_ISFREE(licp, i));
+				break;
+			}
+			for (i = 0; i <= XFS_LIC_MAX_SLOT; i++) {
+				if (XFS_LIC_ISFREE(licp, i))
+					break;
+			}
+			ASSERT(i <= XFS_LIC_MAX_SLOT);
+			break;
+		}
+		licp = licp->lic_next;
+	}
+	ASSERT(licp != NULL);
+	/*
+	 * If we find a free descriptor, claim it,
+	 * initialize it, and return it.
+	 */
+	XFS_LIC_CLAIM(licp, i);
+	if (licp->lic_unused <= i) {
+		licp->lic_unused = i + 1;
+		XFS_LIC_INIT_SLOT(licp, i);
+	}
+	lidp = XFS_LIC_SLOT(licp, i);
+	tp->t_items_free--;
+	lidp->lid_item = lip;
+	lidp->lid_flags = 0;
+	lidp->lid_size = 0;
+	lip->li_desc = lidp;
+	lip->li_mountp = tp->t_mountp;
+	return (lidp);
+}
+
+/*
+ * Free the given descriptor.
+ *
+ * This requires setting the bit in the chunk's free mask corresponding
+ * to the given slot.
+ */
+void
+xfs_trans_free_item(xfs_trans_t	*tp, xfs_log_item_desc_t *lidp)
+{
+	uint			slot;
+	xfs_log_item_chunk_t	*licp;
+	xfs_log_item_chunk_t	**licpp;
+
+	slot = XFS_LIC_DESC_TO_SLOT(lidp);
+	licp = XFS_LIC_DESC_TO_CHUNK(lidp);
+	XFS_LIC_RELSE(licp, slot);
+	lidp->lid_item->li_desc = NULL;
+	tp->t_items_free++;
+
+	/*
+	 * If there are no more used items in the chunk and this is not
+	 * the chunk embedded in the transaction structure, then free
+	 * the chunk. First pull it from the chunk list and then
+	 * free it back to the heap.  We didn't bother with a doubly
+	 * linked list here because the lists should be very short
+	 * and this is not a performance path.  It's better to save
+	 * the memory of the extra pointer.
+	 *
+	 * Also decrement the transaction structure's count of free items
+	 * by the number in a chunk since we are freeing an empty chunk.
+	 */
+	if (XFS_LIC_ARE_ALL_FREE(licp) && (licp != &(tp->t_items))) {
+		licpp = &(tp->t_items.lic_next);
+		while (*licpp != licp) {
+			ASSERT(*licpp != NULL);
+			licpp = &((*licpp)->lic_next);
+		}
+		*licpp = licp->lic_next;
+		kmem_free(licp, sizeof(xfs_log_item_chunk_t));
+		tp->t_items_free -= XFS_LIC_NUM_SLOTS;
+	}
+}
+
+/*
+ * This is called to find the descriptor corresponding to the given
+ * log item.  It returns a pointer to the descriptor.
+ * The log item MUST have a corresponding descriptor in the given
+ * transaction.  This routine does not return NULL, it panics.
+ *
+ * The descriptor pointer is kept in the log item's li_desc field.
+ * Just return it.
+ */
+/*ARGSUSED*/
+xfs_log_item_desc_t *
+xfs_trans_find_item(xfs_trans_t	*tp, xfs_log_item_t *lip)
+{
+	ASSERT(lip->li_desc != NULL);
+
+	return (lip->li_desc);
+}
+
+
+/*
+ * Return a pointer to the first descriptor in the chunk list.
+ * This does not return NULL if there are none, it panics.
+ *
+ * The first descriptor must be in either the first or second chunk.
+ * This is because the only chunk allowed to be empty is the first.
+ * All others are freed when they become empty.
+ *
+ * At some point this and xfs_trans_next_item() should be optimized
+ * to quickly look at the mask to determine if there is anything to
+ * look at.
+ */
+xfs_log_item_desc_t *
+xfs_trans_first_item(xfs_trans_t *tp)
+{
+	xfs_log_item_chunk_t	*licp;
+	int			i;
+
+	licp = &tp->t_items;
+	/*
+	 * If it's not in the first chunk, skip to the second.
+	 */
+	if (XFS_LIC_ARE_ALL_FREE(licp)) {
+		licp = licp->lic_next;
+	}
+
+	/*
+	 * Return the first non-free descriptor in the chunk.
+	 */
+	ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
+	for (i = 0; i < licp->lic_unused; i++) {
+		if (XFS_LIC_ISFREE(licp, i)) {
+			continue;
+		}
+
+		return (XFS_LIC_SLOT(licp, i));
+	}
+	cmn_err(CE_WARN, "xfs_trans_first_item() -- no first item");
+	return(NULL);
+}
+
+
+/*
+ * Given a descriptor, return the next descriptor in the chunk list.
+ * This returns NULL if there are no more used descriptors in the list.
+ *
+ * We do this by first locating the chunk in which the descriptor resides,
+ * and then scanning forward in the chunk and the list for the next
+ * used descriptor.
+ */
+/*ARGSUSED*/
+xfs_log_item_desc_t *
+xfs_trans_next_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp)
+{
+	xfs_log_item_chunk_t	*licp;
+	int			i;
+
+	licp = XFS_LIC_DESC_TO_CHUNK(lidp);
+
+	/*
+	 * First search the rest of the chunk. The for loop keeps us
+	 * from referencing things beyond the end of the chunk.
+	 */
+	for (i = (int)XFS_LIC_DESC_TO_SLOT(lidp) + 1; i < licp->lic_unused; i++) {
+		if (XFS_LIC_ISFREE(licp, i)) {
+			continue;
+		}
+
+		return (XFS_LIC_SLOT(licp, i));
+	}
+
+	/*
+	 * Now search the next chunk.  It must be there, because the
+	 * next chunk would have been freed if it were empty.
+	 * If there is no next chunk, return NULL.
+	 */
+	if (licp->lic_next == NULL) {
+		return (NULL);
+	}
+
+	licp = licp->lic_next;
+	ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
+	for (i = 0; i < licp->lic_unused; i++) {
+		if (XFS_LIC_ISFREE(licp, i)) {
+			continue;
+		}
+
+		return (XFS_LIC_SLOT(licp, i));
+	}
+	ASSERT(0);
+	/* NOTREACHED */
+	return 0; /* keep gcc quite */
+}
+
+/*
+ * This is called to unlock all of the items of a transaction and to free
+ * all the descriptors of that transaction.
+ *
+ * It walks the list of descriptors and unlocks each item.  It frees
+ * each chunk except that embedded in the transaction as it goes along.
+ */
+void
+xfs_trans_free_items(
+	xfs_trans_t	*tp,
+	int		flags)
+{
+	xfs_log_item_chunk_t	*licp;
+	xfs_log_item_chunk_t	*next_licp;
+	int			abort;
+
+	abort = flags & XFS_TRANS_ABORT;
+	licp = &tp->t_items;
+	/*
+	 * Special case the embedded chunk so we don't free it below.
+	 */
+	if (!XFS_LIC_ARE_ALL_FREE(licp)) {
+		(void) xfs_trans_unlock_chunk(licp, 1, abort, NULLCOMMITLSN);
+		XFS_LIC_ALL_FREE(licp);
+		licp->lic_unused = 0;
+	}
+	licp = licp->lic_next;
+
+	/*
+	 * Unlock each item in each chunk and free the chunks.
+	 */
+	while (licp != NULL) {
+		ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
+		(void) xfs_trans_unlock_chunk(licp, 1, abort, NULLCOMMITLSN);
+		next_licp = licp->lic_next;
+		kmem_free(licp, sizeof(xfs_log_item_chunk_t));
+		licp = next_licp;
+	}
+
+	/*
+	 * Reset the transaction structure's free item count.
+	 */
+	tp->t_items_free = XFS_LIC_NUM_SLOTS;
+	tp->t_items.lic_next = NULL;
+}
+
+
+
+/*
+ * This is called to unlock the items associated with a transaction.
+ * Items which were not logged should be freed.
+ * Those which were logged must still be tracked so they can be unpinned
+ * when the transaction commits.
+ */
+void
+xfs_trans_unlock_items(xfs_trans_t *tp, xfs_lsn_t commit_lsn)
+{
+	xfs_log_item_chunk_t	*licp;
+	xfs_log_item_chunk_t	*next_licp;
+	xfs_log_item_chunk_t	**licpp;
+	int			freed;
+
+	freed = 0;
+	licp = &tp->t_items;
+
+	/*
+	 * Special case the embedded chunk so we don't free.
+	 */
+	if (!XFS_LIC_ARE_ALL_FREE(licp)) {
+		freed = xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn);
+	}
+	licpp = &(tp->t_items.lic_next);
+	licp = licp->lic_next;
+
+	/*
+	 * Unlock each item in each chunk, free non-dirty descriptors,
+	 * and free empty chunks.
+	 */
+	while (licp != NULL) {
+		ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
+		freed += xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn);
+		next_licp = licp->lic_next;
+		if (XFS_LIC_ARE_ALL_FREE(licp)) {
+			*licpp = next_licp;
+			kmem_free(licp, sizeof(xfs_log_item_chunk_t));
+			freed -= XFS_LIC_NUM_SLOTS;
+		} else {
+			licpp = &(licp->lic_next);
+		}
+		ASSERT(*licpp == next_licp);
+		licp = next_licp;
+	}
+
+	/*
+	 * Fix the free descriptor count in the transaction.
+	 */
+	tp->t_items_free += freed;
+}
+
+/*
+ * Unlock each item pointed to by a descriptor in the given chunk.
+ * Stamp the commit lsn into each item if necessary.
+ * Free descriptors pointing to items which are not dirty if freeing_chunk
+ * is zero. If freeing_chunk is non-zero, then we need to unlock all
+ * items in the chunk including those with XFS_LID_SYNC_UNLOCK set.
+ * Return the number of descriptors freed.
+ */
+STATIC int
+xfs_trans_unlock_chunk(
+	xfs_log_item_chunk_t	*licp,
+	int			freeing_chunk,
+	int			abort,
+	xfs_lsn_t		commit_lsn)
+{
+	xfs_log_item_desc_t	*lidp;
+	xfs_log_item_t		*lip;
+	int			i;
+	int			freed;
+
+	freed = 0;
+	lidp = licp->lic_descs;
+	for (i = 0; i < licp->lic_unused; i++, lidp++) {
+		if (XFS_LIC_ISFREE(licp, i)) {
+			continue;
+		}
+		lip = lidp->lid_item;
+		lip->li_desc = NULL;
+
+		if (commit_lsn != NULLCOMMITLSN)
+			IOP_COMMITTING(lip, commit_lsn);
+
+		/* XXXsup */
+		if (abort)
+			lip->li_flags |= XFS_LI_ABORTED;
+
+		/* if (abort) {
+			IOP_ABORT(lip);
+		} else */
+		if (!(lidp->lid_flags & XFS_LID_SYNC_UNLOCK) ||
+			   freeing_chunk || abort) {
+			IOP_UNLOCK(lip);
+		}
+
+		/*
+		 * Free the descriptor if the item is not dirty
+		 * within this transaction and the caller is not
+		 * going to just free the entire thing regardless.
+		 */
+		if (!(freeing_chunk) &&
+		    (!(lidp->lid_flags & XFS_LID_DIRTY) || abort)) {
+			XFS_LIC_RELSE(licp, i);
+			freed++;
+		}
+	}
+
+	return (freed);
+}
+
+
+/*
+ * This is called to add the given busy item to the transaction's
+ * list of busy items.  It must find a free busy item descriptor
+ * or allocate a new one and add the item to that descriptor.
+ * The function returns a pointer to busy descriptor used to point
+ * to the new busy entry.  The log busy entry will now point to its new
+ * descriptor with its ???? field.
+ */
+xfs_log_busy_slot_t *
+xfs_trans_add_busy(xfs_trans_t *tp, xfs_agnumber_t ag, xfs_extlen_t idx)
+{
+	xfs_log_busy_chunk_t	*lbcp;
+	xfs_log_busy_slot_t	*lbsp;
+	int			i=0;
+
+	/*
+	 * If there are no free descriptors, allocate a new chunk
+	 * of them and put it at the front of the chunk list.
+	 */
+	if (tp->t_busy_free == 0) {
+		lbcp = (xfs_log_busy_chunk_t*)
+		       kmem_alloc(sizeof(xfs_log_busy_chunk_t), KM_SLEEP);
+		ASSERT(lbcp != NULL);
+		/*
+		 * Initialize the chunk, and then
+		 * claim the first slot in the newly allocated chunk.
+		 */
+		XFS_LBC_INIT(lbcp);
+		XFS_LBC_CLAIM(lbcp, 0);
+		lbcp->lbc_unused = 1;
+		lbsp = XFS_LBC_SLOT(lbcp, 0);
+
+		/*
+		 * Link in the new chunk and update the free count.
+		 */
+		lbcp->lbc_next = tp->t_busy.lbc_next;
+		tp->t_busy.lbc_next = lbcp;
+		tp->t_busy_free = XFS_LIC_NUM_SLOTS - 1;
+
+		/*
+		 * Initialize the descriptor and the generic portion
+		 * of the log item.
+		 *
+		 * Point the new slot at this item and return it.
+		 * Also point the log item at its currently active
+		 * descriptor and set the item's mount pointer.
+		 */
+		lbsp->lbc_ag = ag;
+		lbsp->lbc_idx = idx;
+		return (lbsp);
+	}
+
+	/*
+	 * Find the free descriptor. It is somewhere in the chunklist
+	 * of descriptors.
+	 */
+	lbcp = &tp->t_busy;
+	while (lbcp != NULL) {
+		if (XFS_LBC_VACANCY(lbcp)) {
+			if (lbcp->lbc_unused <= XFS_LBC_MAX_SLOT) {
+				i = lbcp->lbc_unused;
+				break;
+			} else {
+				/* out-of-order vacancy */
+				printk("OOO vacancy lbcp 0x%p\n", lbcp);
+				ASSERT(0);
+			}
+		}
+		lbcp = lbcp->lbc_next;
+	}
+	ASSERT(lbcp != NULL);
+	/*
+	 * If we find a free descriptor, claim it,
+	 * initialize it, and return it.
+	 */
+	XFS_LBC_CLAIM(lbcp, i);
+	if (lbcp->lbc_unused <= i) {
+		lbcp->lbc_unused = i + 1;
+	}
+	lbsp = XFS_LBC_SLOT(lbcp, i);
+	tp->t_busy_free--;
+	lbsp->lbc_ag = ag;
+	lbsp->lbc_idx = idx;
+	return (lbsp);
+}
+
+
+/*
+ * xfs_trans_free_busy
+ * Free all of the busy lists from a transaction
+ */
+void
+xfs_trans_free_busy(xfs_trans_t *tp)
+{
+	xfs_log_busy_chunk_t	*lbcp;
+	xfs_log_busy_chunk_t	*lbcq;
+
+	lbcp = tp->t_busy.lbc_next;
+	while (lbcp != NULL) {
+		lbcq = lbcp->lbc_next;
+		kmem_free(lbcp, sizeof(xfs_log_busy_chunk_t));
+		lbcp = lbcq;
+	}
+
+	XFS_LBC_INIT(&tp->t_busy);
+	tp->t_busy.lbc_unused = 0;
+}