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| 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 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | ext4: track all extent status in extent status tree (diff) | |
| download | linux-dev-d100eef2440fea13e4f09e88b1c8bcbca64beb9f.tar.xz linux-dev-d100eef2440fea13e4f09e88b1c8bcbca64beb9f.zip | |
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 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions