summaryrefslogtreecommitdiffstats
path: root/fs/ext4/super.c
diff options
context:
space:
mode:
authorZheng Liu <wenqing.lz@taobao.com>2014-11-25 17:44:37 +0100
committerTheodore Ts'o <tytso@mit.edu>2014-11-25 17:44:37 +0100
commit2f8e0a7c6c89f850ebd5d6c0b9a08317030d1b89 (patch)
tree4e03e95c516bab8be44e23861626f0c0f29a3958 /fs/ext4/super.c
parentext4: fix block reservation for bigalloc filesystems (diff)
downloadlinux-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 'fs/ext4/super.c')
0 files changed, 0 insertions, 0 deletions