ext4: don't call update_backups() multiple times for the same bg

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When performing an online resize, we add a bunch of groups at one time
in ext4_flex_group_add, so in most cases a lot of group descriptors
will be in the same group block. But in the end of this function,
update_backups will be called for every group descriptor and the same
block will be copied and journalled again and again.  It is really a
waste.

Fix things so we only update a particular bg descriptor block once and
skip subsequent updates of the same block.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Tao Ma 2012-09-26 00:08:57 -04:00 • committed by Theodore Ts'o

parent 7f1468d1d5

commit 0acdb8876f

1 changed files with 4 additions and 0 deletions

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fs/ext4/resize.c

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