1 files changed, 342 insertions, 0 deletions

diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c
new file mode 100644
index 000000000000..e2c3706f453d
--- /dev/null
+++ b/fs/xfs/xfs_trans_inode.c
@@ -0,0 +1,342 @@
+/*
+ * 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"
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_trans_priv.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.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            flags,
+        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, flags, 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, flags, 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;
+}
+
+/*
+ * 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);
+                memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
+                      iip->ili_root_size);
+        }
+}
+#endif