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| author | Zheng Liu <wenqing.lz@taobao.com> | 2014-11-25 17:44:37 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-11-25 17:44:37 +0100 |
| commit | 2f8e0a7c6c89f850ebd5d6c0b9a08317030d1b89 (patch) | |
| tree | 4e03e95c516bab8be44e23861626f0c0f29a3958 /mm/mm_init.c | |
| parent | ext4: fix block reservation for bigalloc filesystems (diff) | |
| download | linux-2f8e0a7c6c89f850ebd5d6c0b9a08317030d1b89.tar.xz linux-2f8e0a7c6c89f850ebd5d6c0b9a08317030d1b89.zip | |
ext4: cache extent hole in extent status tree for ext4_da_map_blocks()
Currently extent status tree doesn't cache extent hole when a write
looks up in extent tree to make sure whether a block has been allocated
or not. In this case, we don't put extent hole in extent cache because
later this extent might be removed and a new delayed extent might be
added back. But it will cause a defect when we do a lot of writes. If
we don't put extent hole in extent cache, the following writes also need
to access extent tree to look at whether or not a block has been
allocated. It brings a cache miss. This commit fixes this defect.
Also if the inode doesn't have any extent, this extent hole will be
cached as well.
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'mm/mm_init.c')
0 files changed, 0 insertions, 0 deletions