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cache: Update man page to reflect need for dm-cache 1.3.0

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Update the man page so the user knows that dm-cache 1.3.0 module
is needed.  Also, enforce that in the code and print a warning if
the module is not new enough.
This commit is contained in:
Jonathan Brassow 2014-02-13 09:13:57 -06:00
parent a060b3b390
commit 907641cd3d
2 changed files with 21 additions and 2 deletions
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19
lib/cache_segtype/cache.c
View File

@ -257,13 +257,28 @@ static int _target_present(struct cmd_context *cmd,
const struct lv_segment *seg __attribute__((unused)),
unsigned *attributes __attribute__((unused)))
{
uint32_t maj, min, patchlevel;
static int _cache_checked = 0;
static int _cache_present = 0;
if (!_cache_checked)
if (!_cache_checked) {
_cache_present = target_present(cmd, "cache", 1);
_cache_checked = 1;
if (!target_version("cache", &maj, &min, &patchlevel)) {
log_error("Failed to determine version of cache kernel module");
return 0;
}
_cache_checked = 1;
if ((maj < 1) ||
((maj == 1) && (min < 3))) {
log_error("The cache kernel module is version %u.%u.%u."
" Version 1.3.0+ is required.",
maj, min, patchlevel);
return 0;
}
}
return _cache_present;
}

4
man/lvcreate.8.in
View File

@ -398,6 +398,7 @@ commandline switch alias that will enable their use
However, this argument must be used when no existing
commandline switch alias is available for the desired type,
as is the case with
.IR cache ,
.IR error ,
.IR raid1 ,
.IR raid4 ,
@ -406,6 +407,9 @@ as is the case with
.IR raid10
or
.IR zero .
Note that the cache segment type requires a dm-cache kernel module version
1.3.0 or greater or a kernel version 3.14 or newer.
.TP
.BR \-V ", " \-\-virtualsize " " \fIVirtualSize [ \fIbBsSkKmMgGtTpPeE ]
Creates a sparse device of the given size (in MiB by default) using a snapshot