From patchwork Thu Jan 31 05:17:51 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [3/9, v4] ext4: add physical block and status member into extent status tree Date: Wed, 30 Jan 2013 19:17:51 -0000 From: Zheng Liu X-Patchwork-Id: 217081 Message-Id: <1359609477-29845-4-git-send-email-wenqing.lz@taobao.com> To: linux-ext4@vger.kernel.org Cc: Zheng Liu , "Theodore Ts'o" From: Zheng Liu es_pblk is used to record physical block that maps to the disk. es_status is used to record the status of the extent. Three status are defined, which are written, unwritten and delayed. Signed-off-by: Zheng Liu Cc: "Theodore Ts'o" --- fs/ext4/extents_status.h | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h index 81e9339..2eb9cc3 100644 --- a/fs/ext4/extents_status.h +++ b/fs/ext4/extents_status.h @@ -20,10 +20,22 @@ #define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) #endif +enum { + EXTENT_STATUS_WRITTEN = 0, /* written extent */ + EXTENT_STATUS_UNWRITTEN = 1, /* unwritten extent */ + EXTENT_STATUS_DELAYED = 2, /* delayed extent */ +}; + +/* + * Here for save memory es_status is stashed into es_pblk because we only have + * 48 bits physical block and es_status only needs 2 bits. + */ struct extent_status { struct rb_node rb_node; - ext4_lblk_t es_lblk; /* first logical block extent covers */ - ext4_lblk_t es_len; /* length of extent in block */ + ext4_lblk_t es_lblk; /* first logical block extent covers */ + ext4_lblk_t es_len; /* length of extent in block */ + ext4_fsblk_t es_pblk : 62; /* first physical block */ + ext4_fsblk_t es_status : 2; /* record the status of extent */ }; struct ext4_es_tree {