From: zwu.kernel@gmail.com Subject: [RFC v4+ hot_track 16/19] btrfs: add hot tracking support Date: Mon, 29 Oct 2012 12:30:58 +0800 Message-ID: <1351485061-12297-17-git-send-email-zwu.kernel@gmail.com> References: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> Cc: linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linuxram@linux.vnet.ibm.com, viro@zeniv.linux.org.uk, david@fromorbit.com, tytso@mit.edu, cmm@us.ibm.com, wuzhy@linux.vnet.ibm.com, wenqing.lz@taobao.com To: linux-fsdevel@vger.kernel.org Return-path: In-Reply-To: <1351485061-12297-1-git-send-email-zwu.kernel@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org From: Zhi Yong Wu Introduce one new mount option '-o hot_track', and add its parsing support. Its usage looks like: mount -o hot_track mount -o nouser,hot_track mount -o nouser,hot_track,loop mount -o hot_track,nouser Signed-off-by: Zhi Yong Wu --- fs/btrfs/ctree.h | 1 + fs/btrfs/super.c | 22 +++++++++++++++++++++- 2 files changed, 22 insertions(+), 1 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index c72ead8..4703178 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1756,6 +1756,7 @@ struct btrfs_ioctl_defrag_range_args { #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22) +#define BTRFS_MOUNT_HOT_TRACK (1 << 23) #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 915ac14..0bcc62b 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -41,6 +41,7 @@ #include #include #include +#include #include "compat.h" #include "delayed-inode.h" #include "ctree.h" @@ -299,6 +300,10 @@ static void btrfs_put_super(struct super_block *sb) * last process that kept it busy. Or segfault in the aforementioned * process... Whom would you report that to? */ + + /* Hot data tracking */ + if (btrfs_test_opt(btrfs_sb(sb)->tree_root, HOT_TRACK)) + hot_track_exit(sb); } enum { @@ -311,7 +316,7 @@ enum { Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, Opt_skip_balance, Opt_check_integrity, Opt_check_integrity_including_extent_data, - Opt_check_integrity_print_mask, Opt_fatal_errors, + Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_hot_track, Opt_err, }; @@ -352,6 +357,7 @@ static match_table_t tokens = { {Opt_check_integrity_including_extent_data, "check_int_data"}, {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, {Opt_fatal_errors, "fatal_errors=%s"}, + {Opt_hot_track, "hot_track"}, {Opt_err, NULL}, }; @@ -614,6 +620,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) goto out; } break; + case Opt_hot_track: + btrfs_set_opt(info->mount_opt, HOT_TRACK); + break; case Opt_err: printk(KERN_INFO "btrfs: unrecognized mount option " "'%s'\n", p); @@ -841,11 +850,20 @@ static int btrfs_fill_super(struct super_block *sb, goto fail_close; } + if (btrfs_test_opt(fs_info->tree_root, HOT_TRACK)) { + err = hot_track_init(sb); + if (err) + goto fail_hot; + } + save_mount_options(sb, data); cleancache_init_fs(sb); sb->s_flags |= MS_ACTIVE; return 0; +fail_hot: + dput(sb->s_root); + sb->s_root = NULL; fail_close: close_ctree(fs_info->tree_root); return err; @@ -941,6 +959,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) seq_puts(seq, ",skip_balance"); if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) seq_puts(seq, ",fatal_errors=panic"); + if (btrfs_test_opt(root, HOT_TRACK)) + seq_puts(seq, ",hot_track"); return 0; } -- 1.7.6.5