--- /dev/null
+Index: linux-2.4.29/fs/ext3/super.c
+===================================================================
+--- linux-2.4.29.orig/fs/ext3/super.c 2005-05-03 15:53:33.047533872 +0300
++++ linux-2.4.29/fs/ext3/super.c 2005-05-03 15:54:47.192262160 +0300
+@@ -400,6 +400,127 @@
+ }
+ }
+
++#ifdef EXT3_DELETE_THREAD
++/*
++ * Delete inodes in a loop until there are no more to be deleted.
++ * Normally, we run in the background doing the deletes and sleeping again,
++ * and clients just add new inodes to be deleted onto the end of the list.
++ * If someone is concerned about free space (e.g. block allocation or similar)
++ * then they can sleep on s_delete_waiter_queue and be woken up when space
++ * has been freed.
++ */
++int ext3_delete_thread(void *data)
++{
++ struct super_block *sb = data;
++ struct ext3_sb_info *sbi = EXT3_SB(sb);
++ struct task_struct *tsk = current;
++
++ /* Almost like daemonize, but not quite */
++ exit_mm(current);
++ tsk->session = 1;
++ tsk->pgrp = 1;
++ tsk->tty = NULL;
++ exit_files(current);
++ reparent_to_init();
++
++ sprintf(tsk->comm, "kdelext3-%s", kdevname(sb->s_dev));
++ sigfillset(&tsk->blocked);
++
++ /*tsk->flags |= PF_KERNTHREAD;*/
++
++ INIT_LIST_HEAD(&sbi->s_delete_list);
++ wake_up(&sbi->s_delete_waiter_queue);
++ ext3_debug("delete thread on %s started\n", kdevname(sb->s_dev));
++
++ /* main loop */
++ for (;;) {
++ wait_event_interruptible(sbi->s_delete_thread_queue,
++ !list_empty(&sbi->s_delete_list) ||
++ !test_opt(sb, ASYNCDEL));
++ ext3_debug("%s woken up: %lu inodes, %lu blocks\n",
++ tsk->comm,sbi->s_delete_inodes,sbi->s_delete_blocks);
++
++ spin_lock(&sbi->s_delete_lock);
++ if (list_empty(&sbi->s_delete_list)) {
++ clear_opt(sbi->s_mount_opt, ASYNCDEL);
++ memset(&sbi->s_delete_list, 0,
++ sizeof(sbi->s_delete_list));
++ spin_unlock(&sbi->s_delete_lock);
++ ext3_debug("delete thread on %s exiting\n",
++ kdevname(sb->s_dev));
++ wake_up(&sbi->s_delete_waiter_queue);
++ break;
++ }
++
++ while (!list_empty(&sbi->s_delete_list)) {
++ struct inode *inode=list_entry(sbi->s_delete_list.next,
++ struct inode, i_devices);
++ unsigned long blocks = inode->i_blocks >>
++ (inode->i_blkbits - 9);
++
++ list_del_init(&inode->i_devices);
++ spin_unlock(&sbi->s_delete_lock);
++ ext3_debug("%s delete ino %lu blk %lu\n",
++ tsk->comm, inode->i_ino, blocks);
++
++ J_ASSERT(EXT3_I(inode)->i_state & EXT3_STATE_DELETE);
++ J_ASSERT(inode->i_nlink == 1);
++ inode->i_nlink = 0;
++ iput(inode);
++
++ spin_lock(&sbi->s_delete_lock);
++ sbi->s_delete_blocks -= blocks;
++ sbi->s_delete_inodes--;
++ }
++ if (sbi->s_delete_blocks != 0 || sbi->s_delete_inodes != 0) {
++ ext3_warning(sb, __FUNCTION__,
++ "%lu blocks, %lu inodes on list?\n",
++ sbi->s_delete_blocks,sbi->s_delete_inodes);
++ sbi->s_delete_blocks = 0;
++ sbi->s_delete_inodes = 0;
++ }
++ spin_unlock(&sbi->s_delete_lock);
++ wake_up(&sbi->s_delete_waiter_queue);
++ }
++
++ return 0;
++}
++
++static void ext3_start_delete_thread(struct super_block *sb)
++{
++ struct ext3_sb_info *sbi = EXT3_SB(sb);
++ int rc;
++
++ spin_lock_init(&sbi->s_delete_lock);
++ init_waitqueue_head(&sbi->s_delete_thread_queue);
++ init_waitqueue_head(&sbi->s_delete_waiter_queue);
++
++ if (!test_opt(sb, ASYNCDEL))
++ return;
++
++ rc = kernel_thread(ext3_delete_thread, sb, CLONE_VM | CLONE_FILES);
++ if (rc < 0)
++ printk(KERN_ERR "EXT3-fs: cannot start delete thread: rc %d\n",
++ rc);
++ else
++ wait_event(sbi->s_delete_waiter_queue, sbi->s_delete_list.next);
++}
++
++static void ext3_stop_delete_thread(struct ext3_sb_info *sbi)
++{
++ if (sbi->s_delete_list.next == 0) /* thread never started */
++ return;
++
++ clear_opt(sbi->s_mount_opt, ASYNCDEL);
++ wake_up(&sbi->s_delete_thread_queue);
++ wait_event(sbi->s_delete_waiter_queue,
++ sbi->s_delete_list.next == 0 && sbi->s_delete_inodes == 0);
++}
++#else
++#define ext3_start_delete_thread(sbi) do {} while(0)
++#define ext3_stop_delete_thread(sbi) do {} while(0)
++#endif /* EXT3_DELETE_THREAD */
++
+ void ext3_put_super (struct super_block * sb)
+ {
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+@@ -407,6 +528,9 @@
+ kdev_t j_dev = sbi->s_journal->j_dev;
+ int i;
+
++#ifdef EXT3_DELETE_THREAD
++ J_ASSERT(sbi->s_delete_inodes == 0);
++#endif
+ ext3_xattr_put_super(sb);
+ journal_destroy(sbi->s_journal);
+ if (!(sb->s_flags & MS_RDONLY)) {
+@@ -526,6 +650,13 @@
+ clear_opt (*mount_options, XATTR_USER);
+ else
+ #endif
++#ifdef EXT3_DELETE_THREAD
++ if (!strcmp(this_char, "asyncdel"))
++ set_opt(*mount_options, ASYNCDEL);
++ else if (!strcmp(this_char, "noasyncdel"))
++ clear_opt(*mount_options, ASYNCDEL);
++ else
++#endif
+ if (!strcmp (this_char, "bsddf"))
+ clear_opt (*mount_options, MINIX_DF);
+ else if (!strcmp (this_char, "nouid32")) {
+@@ -1244,6 +1375,7 @@
+ }
+
+ ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
++ ext3_start_delete_thread(sb);
+ EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
+ ext3_orphan_cleanup(sb, es);
+ EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
+@@ -1626,7 +1758,12 @@
+ static int ext3_sync_fs(struct super_block *sb)
+ {
+ tid_t target;
+-
++
++ if (atomic_read(&sb->s_active) == 0) {
++ /* fs is being umounted: time to stop delete thread */
++ ext3_stop_delete_thread(EXT3_SB(sb));
++ }
++
+ sb->s_dirt = 0;
+ target = log_start_commit(EXT3_SB(sb)->s_journal, NULL);
+ log_wait_commit(EXT3_SB(sb)->s_journal, target);
+@@ -1690,6 +1827,9 @@
+ if (!parse_options(data, &tmp, sbi, &tmp, 1))
+ return -EINVAL;
+
++ if (!test_opt(sb, ASYNCDEL) || (*flags & MS_RDONLY))
++ ext3_stop_delete_thread(sbi);
++
+ if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
+ ext3_abort(sb, __FUNCTION__, "Abort forced by user");
+
+Index: linux-2.4.29/fs/ext3/inode.c
+===================================================================
+--- linux-2.4.29.orig/fs/ext3/inode.c 2005-05-03 15:53:36.555000656 +0300
++++ linux-2.4.29/fs/ext3/inode.c 2005-05-03 15:53:56.901907456 +0300
+@@ -2562,6 +2562,118 @@
+ return err;
+ }
+
++#ifdef EXT3_DELETE_THREAD
++/* Move blocks from to-be-truncated inode over to a new inode, and delete
++ * that one from the delete thread instead. This avoids a lot of latency
++ * when truncating large files.
++ *
++ * If we have any problem deferring the truncate, just truncate it right away.
++ * If we defer it, we also mark how many blocks it would free, so that we
++ * can keep the statfs data correct, and we know if we should sleep on the
++ * delete thread when we run out of space.
++ */
++void ext3_truncate_thread(struct inode *old_inode)
++{
++ struct ext3_sb_info *sbi = EXT3_SB(old_inode->i_sb);
++ struct ext3_inode_info *nei, *oei = EXT3_I(old_inode);
++ struct inode *new_inode;
++ handle_t *handle;
++ unsigned long blocks = old_inode->i_blocks >> (old_inode->i_blkbits-9);
++
++ if (!test_opt(old_inode->i_sb, ASYNCDEL) || !sbi->s_delete_list.next)
++ goto out_truncate;
++
++ /* XXX This is a temporary limitation for code simplicity.
++ * We could truncate to arbitrary sizes at some later time.
++ */
++ if (old_inode->i_size != 0)
++ goto out_truncate;
++
++ /* We may want to truncate the inode immediately and not defer it */
++ if (IS_SYNC(old_inode) || blocks <= EXT3_NDIR_BLOCKS ||
++ old_inode->i_size > oei->i_disksize)
++ goto out_truncate;
++
++ /* We can't use the delete thread as-is during real orphan recovery,
++ * as we add to the orphan list here, causing ext3_orphan_cleanup()
++ * to loop endlessly. It would be nice to do so, but needs work.
++ */
++ if (oei->i_state & EXT3_STATE_DELETE ||
++ sbi->s_mount_state & EXT3_ORPHAN_FS) {
++ ext3_debug("doing deferred inode %lu delete (%lu blocks)\n",
++ old_inode->i_ino, blocks);
++ goto out_truncate;
++ }
++
++ ext3_discard_prealloc(old_inode);
++
++ /* old_inode = 1
++ * new_inode = sb + GDT + ibitmap
++ * orphan list = 1 inode/superblock for add, 2 inodes for del
++ * quota files = 2 * EXT3_SINGLEDATA_TRANS_BLOCKS
++ */
++ handle = ext3_journal_start(old_inode, 7);
++ if (IS_ERR(handle))
++ goto out_truncate;
++
++ new_inode = ext3_new_inode(handle, old_inode, old_inode->i_mode);
++ if (IS_ERR(new_inode)) {
++ ext3_debug("truncate inode %lu directly (no new inodes)\n",
++ old_inode->i_ino);
++ goto out_journal;
++ }
++
++ nei = EXT3_I(new_inode);
++
++ down_write(&oei->truncate_sem);
++ new_inode->i_size = old_inode->i_size;
++ new_inode->i_blocks = old_inode->i_blocks;
++ new_inode->i_uid = old_inode->i_uid;
++ new_inode->i_gid = old_inode->i_gid;
++ new_inode->i_nlink = 1;
++
++ /* FIXME when we do arbitrary truncates */
++ old_inode->i_blocks = oei->i_file_acl ? old_inode->i_blksize / 512 : 0;
++ old_inode->i_mtime = old_inode->i_ctime = CURRENT_TIME;
++
++ memcpy(nei->i_data, oei->i_data, sizeof(nei->i_data));
++ memset(oei->i_data, 0, sizeof(oei->i_data));
++
++ nei->i_disksize = oei->i_disksize;
++ nei->i_state |= EXT3_STATE_DELETE;
++ up_write(&oei->truncate_sem);
++
++ if (ext3_orphan_add(handle, new_inode) < 0)
++ goto out_journal;
++
++ if (ext3_orphan_del(handle, old_inode) < 0) {
++ ext3_orphan_del(handle, new_inode);
++ iput(new_inode);
++ goto out_journal;
++ }
++
++ ext3_journal_stop(handle, old_inode);
++
++ spin_lock(&sbi->s_delete_lock);
++ J_ASSERT(list_empty(&new_inode->i_devices));
++ list_add_tail(&new_inode->i_devices, &sbi->s_delete_list);
++ sbi->s_delete_blocks += blocks;
++ sbi->s_delete_inodes++;
++ spin_unlock(&sbi->s_delete_lock);
++
++ ext3_debug("delete inode %lu (%lu blocks) by thread\n",
++ new_inode->i_ino, blocks);
++
++ wake_up(&sbi->s_delete_thread_queue);
++ return;
++
++out_journal:
++ ext3_journal_stop(handle, old_inode);
++out_truncate:
++ ext3_truncate(old_inode);
++}
++#endif /* EXT3_DELETE_THREAD */
++
+ /*
+ * On success, We end up with an outstanding reference count against
+ * iloc->bh. This _must_ be cleaned up later.
+Index: linux-2.4.29/fs/ext3/file.c
+===================================================================
+--- linux-2.4.29.orig/fs/ext3/file.c 2005-04-07 19:31:00.000000000 +0300
++++ linux-2.4.29/fs/ext3/file.c 2005-05-03 15:53:56.902907304 +0300
+@@ -123,7 +123,11 @@
+ };
+
+ struct inode_operations ext3_file_inode_operations = {
++#ifdef EXT3_DELETE_THREAD
++ truncate: ext3_truncate_thread, /* BKL held */
++#else
+ truncate: ext3_truncate, /* BKL held */
++#endif
+ setattr: ext3_setattr, /* BKL held */
+ setxattr: ext3_setxattr, /* BKL held */
+ getxattr: ext3_getxattr, /* BKL held */
+Index: linux-2.4.29/fs/ext3/namei.c
+===================================================================
+--- linux-2.4.29.orig/fs/ext3/namei.c 2005-05-03 15:53:33.044534328 +0300
++++ linux-2.4.29/fs/ext3/namei.c 2005-05-03 15:53:56.905906848 +0300
+@@ -838,6 +838,40 @@
+ return retval;
+ }
+
++#ifdef EXT3_DELETE_THREAD
++static int ext3_try_to_delay_deletion(struct inode *inode)
++{
++ struct ext3_sb_info *sbi = EXT3_SB(inode->i_sb);
++ struct ext3_inode_info *ei = EXT3_I(inode);
++ unsigned long blocks;
++
++ if (!test_opt(inode->i_sb, ASYNCDEL))
++ return 0;
++
++ /* We may want to delete the inode immediately and not defer it */
++ blocks = inode->i_blocks >> (inode->i_blkbits - 9);
++ if (IS_SYNC(inode) || blocks <= EXT3_NDIR_BLOCKS)
++ return 0;
++
++ inode->i_nlink = 1;
++ atomic_inc(&inode->i_count);
++ ei->i_state |= EXT3_STATE_DELETE;
++
++ spin_lock(&sbi->s_delete_lock);
++ J_ASSERT(list_empty(&inode->i_devices));
++ list_add_tail(&inode->i_devices, &sbi->s_delete_list);
++ sbi->s_delete_blocks += blocks;
++ sbi->s_delete_inodes++;
++ spin_unlock(&sbi->s_delete_lock);
++
++ wake_up(&sbi->s_delete_thread_queue);
++
++ return 0;
++}
++#else
++#define ext3_try_to_delay_deletion(inode) do {} while (0)
++#endif
++
+ static int ext3_unlink(struct inode * dir, struct dentry *dentry)
+ {
+ int retval;
+@@ -878,8 +912,10 @@
+ dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
+ ext3_mark_inode_dirty(handle, dir);
+ inode->i_nlink--;
+- if (!inode->i_nlink)
++ if (!inode->i_nlink) {
++ ext3_try_to_delay_deletion(inode);
+ ext3_orphan_add(handle, inode);
++ }
+ inode->i_ctime = dir->i_ctime;
+ ext3_mark_inode_dirty(handle, inode);
+ retval = 0;
+Index: linux-2.4.29/include/linux/ext3_fs.h
+===================================================================
+--- linux-2.4.29.orig/include/linux/ext3_fs.h 2005-05-03 15:53:37.124914016 +0300
++++ linux-2.4.29/include/linux/ext3_fs.h 2005-05-03 15:53:56.907906544 +0300
+@@ -188,6 +188,7 @@
+ */
+ #define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
+ #define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
++#define EXT3_STATE_DELETE 0x00000010 /* deferred delete inode */
+
+ /*
+ * ioctl commands
+@@ -315,6 +316,7 @@
+ #define EXT3_MOUNT_UPDATE_JOURNAL 0x1000 /* Update the journal format */
+ #define EXT3_MOUNT_NO_UID32 0x2000 /* Disable 32-bit UIDs */
+ #define EXT3_MOUNT_XATTR_USER 0x4000 /* Extended user attributes */
++#define EXT3_MOUNT_ASYNCDEL 0x20000 /* Delayed deletion */
+
+ /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
+ #ifndef _LINUX_EXT2_FS_H
+@@ -639,6 +641,9 @@
+ extern void ext3_dirty_inode(struct inode *);
+ extern int ext3_change_inode_journal_flag(struct inode *, int);
+ extern void ext3_truncate (struct inode *);
++#ifdef EXT3_DELETE_THREAD
++extern void ext3_truncate_thread(struct inode *inode);
++#endif
+ extern void ext3_set_inode_flags(struct inode *);
+
+ /* ioctl.c */
+Index: linux-2.4.29/include/linux/ext3_fs_sb.h
+===================================================================
+--- linux-2.4.29.orig/include/linux/ext3_fs_sb.h 2005-05-03 15:53:33.048533720 +0300
++++ linux-2.4.29/include/linux/ext3_fs_sb.h 2005-05-03 15:53:56.909906240 +0300
+@@ -29,6 +29,8 @@
+
+ #define EXT3_MAX_GROUP_LOADED 8
+
++#define EXT3_DELETE_THREAD
++
+ /*
+ * third extended-fs super-block data in memory
+ */
+@@ -74,6 +76,14 @@
+ struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
+ wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
+ #endif
++#ifdef EXT3_DELETE_THREAD
++ spinlock_t s_delete_lock;
++ struct list_head s_delete_list;
++ unsigned long s_delete_blocks;
++ unsigned long s_delete_inodes;
++ wait_queue_head_t s_delete_thread_queue;
++ wait_queue_head_t s_delete_waiter_queue;
++#endif
+ };
+
+ #endif /* _LINUX_EXT3_FS_SB */
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