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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/xfs/xfs_trans_priv.h
Initial import
Diffstat (limited to 'fs/xfs/xfs_trans_priv.h')
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1 files changed, 161 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
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+++ b/fs/xfs/xfs_trans_priv.h
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+/*
+ * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms 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. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef __XFS_TRANS_PRIV_H__
+#define __XFS_TRANS_PRIV_H__
+
+struct xfs_log_item;
+struct xfs_log_item_desc;
+struct xfs_mount;
+struct xfs_trans;
+struct xfs_ail;
+struct xfs_log_vec;
+
+
+void xfs_trans_init(struct xfs_mount *);
+void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
+void xfs_trans_del_item(struct xfs_log_item *);
+void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
+ int flags);
+void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
+
+void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
+ xfs_lsn_t commit_lsn, int aborted);
+/*
+ * AIL traversal cursor.
+ *
+ * Rather than using a generation number for detecting changes in the ail, use
+ * a cursor that is protected by the ail lock. The aild cursor exists in the
+ * struct xfs_ail, but other traversals can declare it on the stack and link it
+ * to the ail list.
+ *
+ * When an object is deleted from or moved int the AIL, the cursor list is
+ * searched to see if the object is a designated cursor item. If it is, it is
+ * deleted from the cursor so that the next time the cursor is used traversal
+ * will return to the start.
+ *
+ * This means a traversal colliding with a removal will cause a restart of the
+ * list scan, rather than any insertion or deletion anywhere in the list. The
+ * low bit of the item pointer is set if the cursor has been invalidated so
+ * that we can tell the difference between invalidation and reaching the end
+ * of the list to trigger traversal restarts.
+ */
+struct xfs_ail_cursor {
+ struct list_head list;
+ struct xfs_log_item *item;
+};
+
+/*
+ * Private AIL structures.
+ *
+ * Eventually we need to drive the locking in here as well.
+ */
+struct xfs_ail {
+ struct xfs_mount *xa_mount;
+ struct task_struct *xa_task;
+ struct list_head xa_ail;
+ xfs_lsn_t xa_target;
+ xfs_lsn_t xa_target_prev;
+ struct list_head xa_cursors;
+ spinlock_t xa_lock;
+ xfs_lsn_t xa_last_pushed_lsn;
+ int xa_log_flush;
+ struct list_head xa_buf_list;
+ wait_queue_head_t xa_empty;
+};
+
+/*
+ * From xfs_trans_ail.c
+ */
+void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur,
+ struct xfs_log_item **log_items, int nr_items,
+ xfs_lsn_t lsn) __releases(ailp->xa_lock);
+/*
+ * Return a pointer to the first item in the AIL. If the AIL is empty, then
+ * return NULL.
+ */
+static inline struct xfs_log_item *
+xfs_ail_min(
+ struct xfs_ail *ailp)
+{
+ return list_first_entry_or_null(&ailp->xa_ail, struct xfs_log_item,
+ li_ail);
+}
+
+static inline void
+xfs_trans_ail_update(
+ struct xfs_ail *ailp,
+ struct xfs_log_item *lip,
+ xfs_lsn_t lsn) __releases(ailp->xa_lock)
+{
+ xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
+}
+
+void xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
+ struct xfs_log_item **log_items, int nr_items,
+ int shutdown_type)
+ __releases(ailp->xa_lock);
+static inline void
+xfs_trans_ail_delete(
+ struct xfs_ail *ailp,
+ xfs_log_item_t *lip,
+ int shutdown_type) __releases(ailp->xa_lock)
+{
+ xfs_trans_ail_delete_bulk(ailp, &lip, 1, shutdown_type);
+}
+
+void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
+void xfs_ail_push_all(struct xfs_ail *);
+void xfs_ail_push_all_sync(struct xfs_ail *);
+struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
+xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
+
+struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur,
+ xfs_lsn_t lsn);
+struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur,
+ xfs_lsn_t lsn);
+struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur);
+void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
+
+#if BITS_PER_LONG != 64
+static inline void
+xfs_trans_ail_copy_lsn(
+ struct xfs_ail *ailp,
+ xfs_lsn_t *dst,
+ xfs_lsn_t *src)
+{
+ ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
+ spin_lock(&ailp->xa_lock);
+ *dst = *src;
+ spin_unlock(&ailp->xa_lock);
+}
+#else
+static inline void
+xfs_trans_ail_copy_lsn(
+ struct xfs_ail *ailp,
+ xfs_lsn_t *dst,
+ xfs_lsn_t *src)
+{
+ ASSERT(sizeof(xfs_lsn_t) == 8);
+ *dst = *src;
+}
+#endif
+#endif /* __XFS_TRANS_PRIV_H__ */