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ext4: refine extent status tree

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This commit refines the extent status tree code.

1) A prefix 'es_' is added to to the extent status tree structure
members.

2) Refactored es_remove_extent() so that __es_remove_extent() can be
used by es_insert_extent() to remove the old extent entry(-ies) before
inserting a new one.

3) Rename extent_status_end() to ext4_es_end()

4) ext4_es_can_be_merged() is define to check whether two extents can
be merged or not.

5) Update and clarified comments.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Zheng Liu
2013-02-18 00:26:51 -05:00
committed by Theodore Ts'o
parent 0f70b40613
commit 06b0c88621
5 changed files with 221 additions and 182 deletions
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40
include/trace/events/ext4.h
View File

@@ -2093,75 +2093,75 @@ TRACE_EVENT(ext4_ext_remove_space_done,
);
TRACE_EVENT(ext4_es_insert_extent,
TP_PROTO(struct inode *inode, ext4_lblk_t start, ext4_lblk_t len),
TP_PROTO(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len),
TP_ARGS(inode, start, len),
TP_ARGS(inode, lblk, len),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( loff_t, start )
__field( loff_t, lblk )
__field( loff_t, len )
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->start = start;
__entry->lblk = lblk;
__entry->len = len;
),
TP_printk("dev %d,%d ino %lu es [%lld/%lld)",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
__entry->start, __entry->len)
__entry->lblk, __entry->len)
);
TRACE_EVENT(ext4_es_remove_extent,
TP_PROTO(struct inode *inode, ext4_lblk_t start, ext4_lblk_t len),
TP_PROTO(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len),
TP_ARGS(inode, start, len),
TP_ARGS(inode, lblk, len),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( loff_t, start )
__field( loff_t, lblk )
__field( loff_t, len )
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->start = start;
__entry->lblk = lblk;
__entry->len = len;
),
TP_printk("dev %d,%d ino %lu es [%lld/%lld)",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
__entry->start, __entry->len)
__entry->lblk, __entry->len)
);
TRACE_EVENT(ext4_es_find_extent_enter,
TP_PROTO(struct inode *inode, ext4_lblk_t start),
TP_PROTO(struct inode *inode, ext4_lblk_t lblk),
TP_ARGS(inode, start),
TP_ARGS(inode, lblk),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( ext4_lblk_t, start )
__field( ext4_lblk_t, lblk )
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->start = start;
__entry->lblk = lblk;
),
TP_printk("dev %d,%d ino %lu start %u",
TP_printk("dev %d,%d ino %lu lblk %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino, __entry->start)
(unsigned long) __entry->ino, __entry->lblk)
);
TRACE_EVENT(ext4_es_find_extent_exit,
@@ -2173,7 +2173,7 @@ TRACE_EVENT(ext4_es_find_extent_exit,
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( ext4_lblk_t, start )
__field( ext4_lblk_t, lblk )
__field( ext4_lblk_t, len )
__field( ext4_lblk_t, ret )
),
@@ -2181,15 +2181,15 @@ TRACE_EVENT(ext4_es_find_extent_exit,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->start = es->start;
__entry->len = es->len;
__entry->lblk = es->es_lblk;
__entry->len = es->es_len;
__entry->ret = ret;
),
TP_printk("dev %d,%d ino %lu es [%u/%u) ret %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
__entry->start, __entry->len, __entry->ret)
__entry->lblk, __entry->len, __entry->ret)
);
#endif /* _TRACE_EXT4_H */