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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_trans_inode.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/xfs/xfs_trans_inode.c')
-rw-r--r--fs/xfs/xfs_trans_inode.c342
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 0000000..e2c3706
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+++ 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
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