ext4: fix trimming starting with block 0 with small blocksize

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When s_first_data_block is not zero (which happens e.g. when block size is 1KB)
and trim ioctl is called to start trimming from block 0, the math in
ext4_get_group_no_and_offset() overflows. The overall result is that ioctl
returns EINVAL which is kind of unexpected and we probably don't want
userspace tools to bother with internal details of filesystem structure.
So just silently increase starting offset (and shorten length) when starting
block is below s_first_data_block.

CC: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Jan Kara 2011-01-11 15:16:31 -05:00 • committed by Theodore Ts'o

parent 0a2179b169

commit 0f0a25bf51

1 changed files with 6 additions and 0 deletions

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fs/ext4/mballoc.c

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