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Add the ability to manage the state of write caching when the battery

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back-up is missing or dead.  The current state of this field is reported
in 'mfiutil cache <volume>' and can be adjusted via
'mfiutil cache <volume> bad-bbu-write-cache <enable|disable>'.  This
setting should generally be disabled to avoid data loss.

MFC after:	1 week
This commit is contained in:
John Baldwin 2011-04-05 14:19:05 +00:00
parent 8b927d7b7e
commit 8b22f43d9d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=220363
2 changed files with 40 additions and 7 deletions
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30
usr.sbin/mfiutil/mfi_volume.c
View file

@ -138,6 +138,10 @@ update_cache_policy(int fd, struct mfi_ld_props *props, uint8_t new_policy,
policy & MR_LD_CACHE_READ_AHEAD ?
(policy & MR_LD_CACHE_READ_ADAPTIVE ?
"adaptive" : "always") : "none");
if (changes & MR_LD_CACHE_WRITE_CACHE_BAD_BBU)
printf("%s write caching with bad BBU\n",
policy & MR_LD_CACHE_WRITE_CACHE_BAD_BBU ? "Enabling" :
"Disabling");
props->default_cache_policy = policy;
if (mfi_ld_set_props(fd, props) < 0) {
@ -182,7 +186,7 @@ volume_cache(int ac, char **av)
if (ac == 2) {
printf("mfi%u volume %s cache settings:\n", mfi_unit,
mfi_volume_name(fd, target_id));
printf(" I/O caching: ");
printf(" I/O caching: ");
switch (props.default_cache_policy &
(MR_LD_CACHE_ALLOW_WRITE_CACHE |
MR_LD_CACHE_ALLOW_READ_CACHE)) {
@ -200,14 +204,17 @@ volume_cache(int ac, char **av)
printf("writes and reads\n");
break;
}
printf(" write caching: %s\n",
printf(" write caching: %s\n",
props.default_cache_policy & MR_LD_CACHE_WRITE_BACK ?
"write-back" : "write-through");
printf(" read ahead: %s\n",
printf("write cache with bad BBU: %s\n",
props.default_cache_policy &
MR_LD_CACHE_WRITE_CACHE_BAD_BBU ? "enabled" : "disabled");
printf(" read ahead: %s\n",
props.default_cache_policy & MR_LD_CACHE_READ_AHEAD ?
(props.default_cache_policy & MR_LD_CACHE_READ_ADAPTIVE ?
"adaptive" : "always") : "none");
printf("drive write cache: ");
printf(" drive write cache: ");
switch (props.disk_cache_policy) {
case MR_PD_CACHE_UNCHANGED:
printf("default\n");
@ -273,6 +280,21 @@ volume_cache(int ac, char **av)
error = update_cache_policy(fd, &props, policy,
MR_LD_CACHE_READ_AHEAD |
MR_LD_CACHE_READ_ADAPTIVE);
} else if (strcmp(av[2], "bad-bbu-write-cache") == 0) {
if (ac < 4) {
warnx("cache: bad BBU setting required");
return (EINVAL);
}
if (strcmp(av[3], "enable") == 0)
policy = MR_LD_CACHE_WRITE_CACHE_BAD_BBU;
else if (strcmp(av[3], "disable") == 0)
policy = 0;
else {
warnx("cache: invalid bad BBU setting");
return (EINVAL);
}
error = update_cache_policy(fd, &props, policy,
MR_LD_CACHE_WRITE_CACHE_BAD_BBU);
} else if (strcmp(av[2], "write-cache") == 0) {
if (ac < 4) {
warnx("cache: write-cache setting required");

17
usr.sbin/mfiutil/mfiutil.8
View file

@ -27,7 +27,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd August 16, 2009
.Dd April 5, 2011
.Dt MFIUTIL 8
.Os
.Sh NAME
@ -367,7 +367,7 @@ Enable caching only for write I/O operations.
Use write-back policy for cached writes.
.It Cm write-through
Use write-through policy for cached writes.
.It Cm read-ahead Op Ar value
.It Cm read-ahead Ar value
Set the read ahead policy for cached reads.
The
.Ar value
@ -376,7 +376,18 @@ argument can be set to either
.Dq adaptive ,
or
.Dq always .
.It Cm write-cache Op Ar value
.It Cm bad-bbu-write-cache Ar value
Control the behavior of I/O write caching if the battery is dead or
missing.
The
.Ar value
argument can be set to either
.Dq disable
or
.Dq enable .
In general this setting should be left disabled to avoid data loss when
the system loses power.
.It Cm write-cache Ar value
Control the write caches on the physical drives backing
.Ar volume .
The