From patchwork Sun Sep 23 12:56:29 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhiyong Wu X-Patchwork-Id: 1495471 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 17BF8400EC for ; Sun, 23 Sep 2012 13:01:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753844Ab2IWM6U (ORCPT ); Sun, 23 Sep 2012 08:58:20 -0400 Received: from e38.co.us.ibm.com ([32.97.110.159]:54633 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753842Ab2IWM5V (ORCPT ); Sun, 23 Sep 2012 08:57:21 -0400 Received: from /spool/local by e38.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sun, 23 Sep 2012 06:57:18 -0600 Received: from d03relay05.boulder.ibm.com (d03relay05.boulder.ibm.com [9.17.195.107]) by d03dlp01.boulder.ibm.com (Postfix) with ESMTP id 6B77B1FF0039; Sun, 23 Sep 2012 06:57:14 -0600 (MDT) Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay05.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q8NCvITa275612; Sun, 23 Sep 2012 06:57:18 -0600 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q8NCvGWK016081; Sun, 23 Sep 2012 06:57:17 -0600 Received: from us.ibm.com (f15.cn.ibm.com [9.115.122.154]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with SMTP id q8NCvBFe015652; Sun, 23 Sep 2012 06:57:12 -0600 Received: by us.ibm.com (sSMTP sendmail emulation); Sun, 23 Sep 2012 20:57:01 +0800 From: zwu.kernel@gmail.com To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linuxram@linux.vnet.ibm.com, viro@zeniv.linux.org.uk, cmm@us.ibm.com, tytso@mit.edu, marco.stornelli@gmail.com, david@fromorbit.com, stroetmann@ontolinux.com, diegocg@gmail.com, chris@csamuel.org, Zhi Yong Wu Subject: [RFC v2 04/10] vfs: add init and exit support Date: Sun, 23 Sep 2012 20:56:29 +0800 Message-Id: <1348404995-14372-5-git-send-email-zwu.kernel@gmail.com> X-Mailer: git-send-email 1.7.6.5 In-Reply-To: <1348404995-14372-1-git-send-email-zwu.kernel@gmail.com> References: <1348404995-14372-1-git-send-email-zwu.kernel@gmail.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12092312-5518-0000-0000-000007DD3CE5 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Zhi Yong Wu Add initialization function to create some key data structures when hot tracking is enabled; Clean up them when hot tracking is disabled Signed-off-by: Zhi Yong Wu --- fs/hot_tracking.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/hot_tracking.h | 2 + fs/namespace.c | 4 +++ fs/super.c | 6 +++++ 4 files changed, 72 insertions(+), 0 deletions(-) diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c index f97e8a6..fa89f70 100644 --- a/fs/hot_tracking.c +++ b/fs/hot_tracking.c @@ -135,6 +135,51 @@ static void hot_rb_free_hot_range_item(struct hot_range_item *hr) } } +static int hot_rb_remove_hot_inode_item(struct hot_inode_tree *tree, + struct hot_inode_item *he) +{ + int ret = 0; + rb_erase(&he->rb_node, &tree->map); + he->in_tree = 0; + return ret; +} + +static int hot_rb_remove_hot_range_item(struct hot_range_tree *tree, + struct hot_range_item *hr) +{ + int ret = 0; + rb_erase(&hr->rb_node, &tree->map); + hr->in_tree = 0; + return ret; +} + +/* Frees the entire hot_inode_tree. */ +static void hot_rb_inode_tree_free(struct hot_info *root) +{ + struct rb_node *node, *node2; + struct hot_inode_item *he; + struct hot_range_item *hr; + + /* Free hot inode and range trees on fs root */ + node = rb_first(&root->hot_inode_tree.map); + + while (node) { + he = rb_entry(node, struct hot_inode_item, rb_node); + + node2 = rb_first(&he->hot_range_tree.map); + while (node2) { + hr = rb_entry(node2, struct hot_range_item, rb_node); + hot_rb_remove_hot_range_item(&he->hot_range_tree, hr); + hot_rb_free_hot_range_item(hr); + node2 = rb_first(&he->hot_range_tree.map); + } + + hot_rb_remove_hot_inode_item(&root->hot_inode_tree, he); + hot_rb_free_hot_inode_item(he); + node = rb_first(&root->hot_inode_tree.map); + } +} + static struct rb_node *hot_rb_insert_hot_inode_item(struct rb_root *root, unsigned long inode_num, struct rb_node *node) @@ -507,3 +552,18 @@ void __init hot_track_cache_init(void) if (hot_rb_item_cache_init()) return; } + +/* + * Initialize the data structures for hot data tracking. + */ +void hot_track_init(struct super_block *sb, const char *name) +{ + sb->s_hotinfo.mount_opt |= HOT_MOUNT_HOT_TRACK; + hot_rb_inode_tree_init(&sb->s_hotinfo.hot_inode_tree); +} + +void hot_track_exit(struct super_block *sb) +{ + sb->s_hotinfo.mount_opt &= ~HOT_MOUNT_HOT_TRACK; + hot_rb_inode_tree_free(&sb->s_hotinfo); +} diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h index 6bd09eb..3a8d398 100644 --- a/fs/hot_tracking.h +++ b/fs/hot_tracking.h @@ -39,5 +39,7 @@ void hot_rb_update_freqs(struct inode *inode, u64 start, u64 len, bool hot_track_parse_options(char *options); void __init hot_track_cache_init(void); +void hot_track_init(struct super_block *sb, const char *name); +void hot_track_exit(struct super_block *sb); #endif /* __HOT_TRACKING__ */ diff --git a/fs/namespace.c b/fs/namespace.c index 4d31f73..55006c8 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -20,6 +20,7 @@ #include /* get_fs_root et.al. */ #include /* fsnotify_vfsmount_delete */ #include +#include "hot_tracking.h" #include "pnode.h" #include "internal.h" @@ -1215,6 +1216,9 @@ static int do_umount(struct mount *mnt, int flags) return retval; } + if (sb->s_hotinfo.mount_opt & HOT_MOUNT_HOT_TRACK) + hot_track_exit(sb); + down_write(&namespace_sem); br_write_lock(&vfsmount_lock); event++; diff --git a/fs/super.c b/fs/super.c index 7eb3b0c..0999d5c 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1153,6 +1153,9 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data) WARN_ON(sb->s_bdi == &default_backing_dev_info); sb->s_flags |= MS_BORN; + if (hottrack) + hot_track_init(sb, name); + error = security_sb_kern_mount(sb, flags, secdata); if (error) goto out_sb; @@ -1170,6 +1173,9 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data) free_secdata(secdata); return root; out_sb: + if (hottrack) + hot_track_exit(sb); + dput(root); deactivate_locked_super(sb); out_free_secdata: