On Sun, Oct 28, 2012 at 5:22 PM, Zheng Liu <gnehzuil.liu@xxxxxxxxx> wrote: > From: Zheng Liu <wenqing.lz@xxxxxxxxxx> > > Define a new mount option to add VFS hot tracking support in order to use it in > ext4. > > CC: Zhi Yong Wu <zwu.kernel@xxxxxxxxx> > Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx> > --- > Hi Zhiyong, > > Here is a try to add hot tracking support in ext4. I do some simple tests and > it works well. > > Regards, > Zheng > > fs/ext4/ext4.h | 3 +++ > fs/ext4/super.c | 15 ++++++++++++++- > 2 files changed, 17 insertions(+), 1 deletion(-) > > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h > index 3c20de1..f6cff1e 100644 > --- a/fs/ext4/ext4.h > +++ b/fs/ext4/ext4.h > @@ -1298,6 +1298,9 @@ struct ext4_sb_info { > > /* Precomputed FS UUID checksum for seeding other checksums */ > __u32 s_csum_seed; > + > + /* Enable hot tracking or not */ > + int s_hottrack_enable; > }; > > static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index 80928f7..1506dc3 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -43,6 +43,7 @@ > > #include <linux/kthread.h> > #include <linux/freezer.h> > +#include <linux/hot_tracking.h> > > #include "ext4.h" > #include "ext4_extents.h" > @@ -864,6 +865,8 @@ static void ext4_put_super(struct super_block *sb) > ext4_ext_release(sb); > ext4_xattr_put_super(sb); > > + if (sbi->s_hottrack_enable) > + hot_track_exit(sb); > if (!(sb->s_flags & MS_RDONLY)) { > EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); > es->s_state = cpu_to_le16(sbi->s_mount_state); > @@ -1222,7 +1225,7 @@ enum { > Opt_inode_readahead_blks, Opt_journal_ioprio, > Opt_dioread_nolock, Opt_dioread_lock, > Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, > - Opt_max_dir_size_kb, > + Opt_max_dir_size_kb, Opt_hottrack, > }; > > static const match_table_t tokens = { > @@ -1297,6 +1300,7 @@ static const match_table_t tokens = { > {Opt_init_itable, "init_itable"}, > {Opt_noinit_itable, "noinit_itable"}, > {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, > + {Opt_hottrack, "hot_track"}, > {Opt_removed, "check=none"}, /* mount option from ext2/3 */ > {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ > {Opt_removed, "reservation"}, /* mount option from ext2/3 */ > @@ -1478,6 +1482,7 @@ static const struct mount_opts { > {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, > {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, > {Opt_max_dir_size_kb, 0, MOPT_GTE0}, > + {Opt_hottrack, 0, MOPT_GTE0}, > {Opt_err, 0, 0} > }; > > @@ -1595,6 +1600,14 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, > sbi->s_li_wait_mult = arg; > } else if (token == Opt_max_dir_size_kb) { > sbi->s_max_dir_size_kb = arg; > + } else if (token == Opt_hottrack) { > + if (hot_track_init(sb)) { > + ext4_msg(sb, KERN_ERR, > + "EXT4-fs: hot tracking initialization" > + " failed"); > + return -1; > + } > + sbi->s_hottrack_enable = 1; > } else if (token == Opt_stripe) { > sbi->s_stripe = arg; > } else if (m->flags & MOPT_DATAJ) { HI, Zheng, Do you not need to free stuff related to hot tracking when umount? > -- > 1.7.12.rc2.18.g61b472e > -- Regards, Zhi Yong Wu -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html