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Message-Id: <1357901627-3068-5-git-send-email-wenqing.lz@taobao.com>
Date: Fri, 11 Jan 2013 18:53:44 +0800
From: Zheng Liu <gnehzuil.liu@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Jan kara <jack@...e.cz>, "Theodore Ts'o" <tytso@....edu>,
Zheng Liu <wenqing.lz@...bao.com>
Subject: [PATCH 4/7 v2] ext4: adjust interfaces of extent status tree
From: Zheng Liu <wenqing.lz@...bao.com>
Due to two members are added into extent status tree, all interfaces need to be
adjusted.
CC: Jan kara <jack@...e.cz>
CC: "Theodore Ts'o" <tytso@....edu>
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
fs/ext4/extents_status.c | 55 ++++++++++++++++++++++++++++++++++++---------
fs/ext4/extents_status.h | 24 +++++++++++++++++++-
fs/ext4/inode.c | 3 ++-
include/trace/events/ext4.h | 34 ++++++++++++++++++----------
4 files changed, 91 insertions(+), 25 deletions(-)
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index 0662369..b5a5224 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -174,7 +174,8 @@ static void ext4_es_print_tree(struct inode *inode)
while (node) {
struct extent_status *es;
es = rb_entry(node, struct extent_status, rb_node);
- printk(KERN_DEBUG " [%u/%u)", es->es_lblk, es->es_len);
+ printk(KERN_DEBUG " [%u/%u) %llu %d",
+ es->es_lblk, es->es_len, es->es_pblk, es->es_status);
node = rb_next(node);
}
printk(KERN_DEBUG "\n");
@@ -229,7 +230,7 @@ static struct extent_status *__es_tree_search(struct rb_root *root,
* @es: delayed extent that we found
*
* Returns the first block of the next extent after es, otherwise
- * EXT_MAX_BLOCKS if no delay extent is found.
+ * EXT_MAX_BLOCKS if no extent is found.
* Delayed extent is returned via @es.
*/
ext4_lblk_t ext4_es_find_extent(struct inode *inode, struct extent_status *es)
@@ -244,12 +245,13 @@ ext4_lblk_t ext4_es_find_extent(struct inode *inode, struct extent_status *es)
read_lock(&EXT4_I(inode)->i_es_lock);
tree = &EXT4_I(inode)->i_es_tree;
- /* find delay extent in cache firstly */
+ /* find extent in cache firstly */
if (tree->cache_es) {
es1 = tree->cache_es;
if (in_range(es->es_lblk, es1->es_lblk, es1->es_len)) {
- es_debug("%u cached by [%u/%u)\n",
- es->es_lblk, es1->es_lblk, es1->es_len);
+ es_debug("%u cached by [%u/%u) %llu %d\n",
+ es->es_lblk, es1->es_lblk, es1->es_len,
+ es1->es_pblk, es1->es_status);
goto out;
}
}
@@ -262,6 +264,8 @@ out:
tree->cache_es = es1;
es->es_lblk = es1->es_lblk;
es->es_len = es1->es_len;
+ es->es_pblk = es1->es_pblk;
+ es->es_status = es1->es_status;
node = rb_next(&es1->rb_node);
if (node) {
es1 = rb_entry(node, struct extent_status, rb_node);
@@ -276,7 +280,8 @@ out:
}
static struct extent_status *
-ext4_es_alloc_extent(ext4_lblk_t lblk, ext4_lblk_t len)
+ext4_es_alloc_extent(ext4_lblk_t lblk, ext4_lblk_t len,
+ ext4_fsblk_t pblk, int status)
{
struct extent_status *es;
es = kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC);
@@ -284,6 +289,8 @@ ext4_es_alloc_extent(ext4_lblk_t lblk, ext4_lblk_t len)
return NULL;
es->es_lblk = lblk;
es->es_len = len;
+ es->es_pblk = pblk;
+ es->es_status = status;
return es;
}
@@ -296,6 +303,8 @@ static void ext4_es_free_extent(struct extent_status *es)
* Check whether or not two extents can be merged
* Condition:
* - logical block number is contiguous
+ * - physical block number is contiguous
+ * - status is equal
*/
static int ext4_es_can_be_merged(struct extent_status *es1,
struct extent_status *es2)
@@ -303,6 +312,13 @@ static int ext4_es_can_be_merged(struct extent_status *es1,
if (es1->es_lblk + es1->es_len != es2->es_lblk)
return 0;
+ if (es1->es_status != es2->es_status)
+ return 0;
+
+ if (!ext4_es_is_delayed(es1) &&
+ (es1->es_pblk + es1->es_len != es2->es_pblk))
+ return 0;
+
return 1;
}
@@ -366,6 +382,8 @@ static int __es_insert_extent(struct ext4_es_tree *tree,
if (ext4_es_can_be_merged(newes, es)) {
es->es_lblk = newes->es_lblk;
es->es_len += newes->es_len;
+ es->es_pblk = ext4_es_get_pblock(es,
+ newes->es_pblk);
es = ext4_es_try_to_merge_left(tree, es);
goto out;
}
@@ -383,7 +401,8 @@ static int __es_insert_extent(struct ext4_es_tree *tree,
}
}
- es = ext4_es_alloc_extent(newes->es_lblk, newes->es_len);
+ es = ext4_es_alloc_extent(newes->es_lblk, newes->es_len,
+ newes->es_pblk, newes->es_status);
if (!es)
return -ENOMEM;
rb_link_node(&es->rb_node, parent, p);
@@ -402,21 +421,23 @@ out:
* Return 0 on success, error code on failure.
*/
int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
- ext4_lblk_t len)
+ ext4_lblk_t len, ext4_fsblk_t pblk, int status)
{
struct ext4_es_tree *tree;
struct extent_status newes;
ext4_lblk_t end = lblk + len - 1;
int err = 0;
- trace_ext4_es_insert_extent(inode, lblk, len);
- es_debug("add [%u/%u) to extent status tree of inode %lu\n",
- lblk, len, inode->i_ino);
+ es_debug("add [%u/%u) %llu %d to extent status tree of inode %lu\n",
+ lblk, len, pblk, status, inode->i_ino);
BUG_ON(end < lblk);
newes.es_lblk = lblk;
newes.es_len = len;
+ newes.es_pblk = pblk;
+ newes.es_status = status;
+ trace_ext4_es_insert_extent(inode, &newes);
write_lock(&EXT4_I(inode)->i_es_lock);
tree = &EXT4_I(inode)->i_es_tree;
@@ -453,6 +474,9 @@ static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
orig_es.es_lblk = es->es_lblk;
orig_es.es_len = es->es_len;
+ orig_es.es_pblk = es->es_pblk;
+ orig_es.es_status = es->es_status;
+
len1 = lblk > es->es_lblk ? lblk - es->es_lblk : 0;
len2 = extent_status_end(es) > end ?
extent_status_end(es) - end : 0;
@@ -464,6 +488,9 @@ static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
newes.es_lblk = end + 1;
newes.es_len = len2;
+ newes.es_pblk = ext4_es_get_pblock(&orig_es,
+ orig_es.es_pblk + orig_es.es_len - len2);
+ newes.es_status = orig_es.es_status;
err = __es_insert_extent(tree, &newes);
if (err) {
es->es_lblk = orig_es.es_lblk;
@@ -473,6 +500,8 @@ static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
} else {
es->es_lblk = end + 1;
es->es_len = len2;
+ es->es_pblk = ext4_es_get_pblock(es,
+ orig_es.es_pblk + orig_es.es_len - len2);
}
goto out;
}
@@ -497,9 +526,13 @@ static int __es_remove_extent(struct ext4_es_tree *tree, ext4_lblk_t lblk,
}
if (es && es->es_lblk < end + 1) {
+ ext4_lblk_t orig_len = es->es_len;
+
len1 = extent_status_end(es) - end;
es->es_lblk = end + 1;
es->es_len = len1;
+ es->es_pblk = ext4_es_get_pblock(es,
+ es->es_pblk + orig_len - len1);
}
out:
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index 85115bb..dad3b5e 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -44,10 +44,32 @@ extern void ext4_exit_es(void);
extern void ext4_es_init_tree(struct ext4_es_tree *tree);
extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
- ext4_lblk_t len);
+ ext4_lblk_t len, ext4_fsblk_t pblk,
+ int status);
extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len);
extern ext4_lblk_t ext4_es_find_extent(struct inode *inode,
struct extent_status *es);
+static inline int ext4_es_is_written(struct extent_status *es)
+{
+ return (es->es_status == EXTENT_STATUS_WRITTEN);
+}
+
+static inline int ext4_es_is_unwritten(struct extent_status *es)
+{
+ return (es->es_status == EXTENT_STATUS_UNWRITTEN);
+}
+
+static inline int ext4_es_is_delayed(struct extent_status *es)
+{
+ return (es->es_status == EXTENT_STATUS_DELAYED);
+}
+
+static inline ext4_fsblk_t ext4_es_get_pblock(struct extent_status *es,
+ ext4_fsblk_t pb)
+{
+ return (ext4_es_is_delayed(es) ? ~0 : pb);
+}
+
#endif /* _EXT4_EXTENTS_STATUS_H */
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 4d066f3..e09c7cf 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1819,7 +1819,8 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
goto out_unlock;
}
- retval = ext4_es_insert_extent(inode, map->m_lblk, map->m_len);
+ retval = ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
+ ~0, EXTENT_STATUS_DELAYED);
if (retval)
goto out_unlock;
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 952628a..5483f62 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -2068,28 +2068,33 @@ TRACE_EVENT(ext4_ext_remove_space_done,
);
TRACE_EVENT(ext4_es_insert_extent,
- TP_PROTO(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len),
+ TP_PROTO(struct inode *inode, struct extent_status *es),
- TP_ARGS(inode, lblk, len),
+ TP_ARGS(inode, es),
TP_STRUCT__entry(
- __field( dev_t, dev )
- __field( ino_t, ino )
- __field( loff_t, lblk )
- __field( loff_t, len )
+ __field( dev_t, dev )
+ __field( ino_t, ino )
+ __field( ext4_lblk_t, lblk )
+ __field( ext4_lblk_t, len )
+ __field( ext4_fsblk_t, pblk )
+ __field( int, status )
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
- __entry->lblk = lblk;
- __entry->len = len;
+ __entry->lblk = es->es_lblk;
+ __entry->len = es->es_len;
+ __entry->pblk = es->es_pblk;
+ __entry->status = es->es_status;
),
- TP_printk("dev %d,%d ino %lu es [%lld/%lld)",
+ TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
- __entry->lblk, __entry->len)
+ __entry->lblk, __entry->len,
+ __entry->pblk, __entry->status)
);
TRACE_EVENT(ext4_es_remove_extent,
@@ -2150,6 +2155,8 @@ TRACE_EVENT(ext4_es_find_extent_exit,
__field( ino_t, ino )
__field( ext4_lblk_t, lblk )
__field( ext4_lblk_t, len )
+ __field( ext4_fsblk_t, pblk )
+ __field( int, status )
__field( ext4_lblk_t, ret )
),
@@ -2158,13 +2165,16 @@ TRACE_EVENT(ext4_es_find_extent_exit,
__entry->ino = inode->i_ino;
__entry->lblk = es->es_lblk;
__entry->len = es->es_len;
+ __entry->pblk = es->es_pblk;
+ __entry->status = es->es_status;
__entry->ret = ret;
),
- TP_printk("dev %d,%d ino %lu es [%u/%u) ret %u",
+ TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %d ret %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
- __entry->lblk, __entry->len, __entry->ret)
+ __entry->lblk, __entry->len,
+ __entry->pblk, __entry->status, __entry->ret)
);
#endif /* _TRACE_EXT4_H */
--
1.7.12.rc2.18.g61b472e
--
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