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Ignore activation/verify_udev_operations if dm kernel driver vsn < 4.18.

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This commit is contained in:
Alasdair Kergon 2011-07-08 16:49:04 +00:00
parent d8ff1b1efb
commit 1485b6fc93
2 changed files with 23 additions and 0 deletions
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1
WHATS_NEW
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@ -15,6 +15,7 @@ Version 2.02.86 -
Fix to preserve exclusive activation of mirror while up-converting.
Reject allocation if number of extents is not divisible by area count.
Fix issue preventing cluster mirror creation.
Ignore activation/verify_udev_operations if dm kernel driver vsn < 4.18.
Add activation/verify_udev_operations to lvm.conf, disabled by default.
Call vg_mark_partial_lvs() before VG structure is returned from the cache.
Remove unused internal flag ACTIVATE_EXCL from the code.

22
lib/commands/toolcontext.c
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@ -200,6 +200,21 @@ static void _init_logging(struct cmd_context *cmd)
reset_lvm_errno(1);
}
/*
* Until the DM_UEVENT_GENERATED_FLAG was introduced in kernel patch
* 856a6f1dbd8940e72755af145ebcd806408ecedd
* some operations could not be performed by udev, requiring our fallback code.
*/
static int _dm_driver_has_stable_udev_support()
{
char vsn[80];
unsigned maj, min, patchlevel;
return driver_version(vsn, sizeof(vsn)) &&
(sscanf(vsn, "%u.%u.%u", &maj, &min, &patchlevel) == 3) &&
(maj == 4 ? min >= 18 : maj > 4);
}
static int _process_config(struct cmd_context *cmd)
{
mode_t old_umask;
@ -299,6 +314,13 @@ static int _process_config(struct cmd_context *cmd)
find_config_tree_int(cmd, "activation/verify_udev_operations",
DEFAULT_VERIFY_UDEV_OPERATIONS) : 1;
/* Do not rely fully on udev if the udev support is known to be incomplete. */
if (!cmd->default_settings.udev_fallback && !_dm_driver_has_stable_udev_support()) {
log_very_verbose("Kernel driver has incomplete udev support so "
"LVM will check and perform some operations itself.");
cmd->default_settings.udev_fallback = 1;
}
#else
/* We must use old node/symlink creation code if not compiled with udev support at all! */
cmd->default_settings.udev_fallback = 1;