diff options
| author | Zheng Liu <wenqing.lz@taobao.com> | 2013-02-18 00:29:59 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-02-18 00:29:59 -0500 |
| commit | d100eef2440fea13e4f09e88b1c8bcbca64beb9f (patch) | |
| tree | 2451dc4582b43a30b414c89108b75148d48c9b57 /include | |
| parent | f7fec032aa782d3fd7e51fbdf08aa3a296c01500 (diff) | |
| download | linux-rt-d100eef2440fea13e4f09e88b1c8bcbca64beb9f.tar.gz | |
ext4: lookup block mapping in extent status tree
After tracking all extent status, we already have a extent cache in
memory. Every time we want to lookup a block mapping, we can first
try to lookup it in extent status tree to avoid a potential disk I/O.
A new function called ext4_es_lookup_extent is defined to finish this
work. When we try to lookup a block mapping, we always call
ext4_map_blocks and/or ext4_da_map_blocks. So in these functions we
first try to lookup a block mapping in extent status tree.
A new flag EXT4_GET_BLOCKS_NO_PUT_HOLE is used in ext4_da_map_blocks
in order not to put a hole into extent status tree because this hole
will be converted to delayed extent in the tree immediately.
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Jan kara <jack@suse.cz>
Diffstat (limited to 'include')
| -rw-r--r-- | include/trace/events/ext4.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h index c121cdf55ab3..1e590b68cec4 100644 --- a/include/trace/events/ext4.h +++ b/include/trace/events/ext4.h @@ -2199,6 +2199,62 @@ TRACE_EVENT(ext4_es_find_delayed_extent_exit, __entry->pblk, __entry->status) ); +TRACE_EVENT(ext4_es_lookup_extent_enter, + TP_PROTO(struct inode *inode, ext4_lblk_t lblk), + + TP_ARGS(inode, lblk), + + TP_STRUCT__entry( + __field( dev_t, dev ) + __field( ino_t, ino ) + __field( ext4_lblk_t, lblk ) + ), + + TP_fast_assign( + __entry->dev = inode->i_sb->s_dev; + __entry->ino = inode->i_ino; + __entry->lblk = lblk; + ), + + TP_printk("dev %d,%d ino %lu lblk %u", + MAJOR(__entry->dev), MINOR(__entry->dev), + (unsigned long) __entry->ino, __entry->lblk) +); + +TRACE_EVENT(ext4_es_lookup_extent_exit, + TP_PROTO(struct inode *inode, struct extent_status *es, + int found), + + TP_ARGS(inode, es, found), + + TP_STRUCT__entry( + __field( dev_t, dev ) + __field( ino_t, ino ) + __field( ext4_lblk_t, lblk ) + __field( ext4_lblk_t, len ) + __field( ext4_fsblk_t, pblk ) + __field( unsigned long long, status ) + __field( int, found ) + ), + + TP_fast_assign( + __entry->dev = inode->i_sb->s_dev; + __entry->ino = inode->i_ino; + __entry->lblk = es->es_lblk; + __entry->len = es->es_len; + __entry->pblk = ext4_es_pblock(es); + __entry->status = ext4_es_status(es); + __entry->found = found; + ), + + TP_printk("dev %d,%d ino %lu found %d [%u/%u) %llu %llx", + MAJOR(__entry->dev), MINOR(__entry->dev), + (unsigned long) __entry->ino, __entry->found, + __entry->lblk, __entry->len, + __entry->found ? __entry->pblk : 0, + __entry->found ? __entry->status : 0) +); + #endif /* _TRACE_EXT4_H */ /* This part must be outside protection */ |