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author | Liu Bo <bo.li.liu@oracle.com> | 2014-07-17 18:46:01 +0800 |
---|---|---|
committer | David Sterba <dsterba@suse.cz> | 2014-08-22 15:07:02 +0200 |
commit | b2d0e10d491f447cd2888e4af44fad9d442e524d (patch) | |
tree | b7f9df2b28f88323489b86b08448239b32b4a26d | |
parent | f1672e50c7f73cbdb1d9817e126c41a3db6d93ce (diff) |
Btrfs-progs: fix wrong manpage of defrag command
'btrfs filesystem defrag' has an option '-t', whose manpage says
"Any extent bigger than threshold given by -t option, will be
considered already defragged. Use 0 to take the kernel default, and
use 1 to say every single extent must be rewritten."
Here 'use 0' still works, it refers to the default value(256K), however,
'use 1' is an obvious typo, it should be -1, which means the largest value
it can be.
Right now, we use parse_size() which no more allow value '-1', so in
order to keep the manpage correct, this updates it to only keep value '0'.
If you want to make sure every single extent is rewritten, please use a fairly
large size, say 1G.
Reported-by: Sebastian Ochmann <ochmann@informatik.uni-bonn.de>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
-rw-r--r-- | Documentation/btrfs-filesystem.txt | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/Documentation/btrfs-filesystem.txt b/Documentation/btrfs-filesystem.txt index 0ee79cba..c9c0b006 100644 --- a/Documentation/btrfs-filesystem.txt +++ b/Documentation/btrfs-filesystem.txt @@ -41,8 +41,7 @@ The start position and the number of bytes to defragment can be specified by start and len using '-s' and '-l' options below. Any extent bigger than threshold given by '-t' option, will be considered already defragged. -Use 0 to take the kernel default, and use 1 to -say every single extent must be rewritten. +Use 0 to take the kernel default. You can also turn on compression in defragment operations. + `Options` |