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>
---
fs/ext4/ext4.h | 3 +++
fs/ext4/super.c | 13 ++++++++++++-
2 files changed, 15 insertions(+), 1 deletions(-)
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..ba9f376 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -864,6 +864,8 @@ 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 +1224,7 @@ 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 +1299,7 @@ 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 */
@@ -1595,6 +1598,14 @@ 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) {
--
1.7.6.5
--
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