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-rw-r--r--fs/xfs/xfs_trans_item.c553
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diff --git a/fs/xfs/xfs_trans_item.c b/fs/xfs/xfs_trans_item.c
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+/*
+ * 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 NULL; /* 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.
+ *
+ * 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);
+ if (abort)
+ lip->li_flags |= XFS_LI_ABORTED;
+ 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;
+}
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