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btrfs-progs: defrag: add a brief warning about ref-link breakage

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There is a warning in btrfs-filesystem(8) saying that running 'defrag'
in Linux will almost certainly break ref-links, with much data potentially
being physically duplicated.

However, many users tend to read man pages *after* trying to run things
on their own risk and may miss this important information. This commit
adds a brief copy of this warning into the command built-in help message
where it has good chances to be spotted before user is stuck with
a crowded filesystem.

Pull-request: #73
Signed-off-by: Pavel Kretov <firegurafiku@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Pavel Kretov 2017-10-25 01:47:45 +03:00 committed by David Sterba
parent ea085932dc
commit a624f16167
1 changed files with 5 additions and 0 deletions
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5
cmds-filesystem.c
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@ -893,6 +893,11 @@ static const char * const cmd_filesystem_defrag_usage[] = {
"-s start defragment only from byte onward",
"-l len defragment only up to len bytes",
"-t size target extent size hint (default: 32M)",
"",
"Warning: most Linux kernels will break up the ref-links of COW data",
"(e.g., files copied with 'cp --reflink', snapshots) which may cause",
"considerable increase of space usage. See btrfs-filesystem(8) for",
"more information.",
NULL
};