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vgchange: move autoactivation setup code

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into its own function, no functional change.
This commit is contained in:
David Teigland 2021-11-10 14:44:11 -06:00
parent d608837b2a
commit 92e741eda0
1 changed files with 102 additions and 57 deletions
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159
tools/vgchange.c
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@ -735,12 +735,18 @@ static int _vgchange_single(struct cmd_context *cmd, const char *vg_name,
return ret;
}
static int _check_autoactivation(struct cmd_context *cmd, struct vgchange_params *vp, int *skip_command)
static int _vgchange_autoactivation_setup(struct cmd_context *cmd,
struct vgchange_params *vp,
int *skip_command,
const char **vgname_ret,
uint32_t *flags)
{
const char *aa;
char *vgname = NULL;
int found_none = 0, found_all = 0, found_incomplete = 0;
if (!(aa = arg_str_value(cmd, autoactivation_ARG, NULL)))
return 1;
return_0;
if (strcmp(aa, "event")) {
log_print("Skip vgchange for unknown autoactivation value.");
@ -755,9 +761,99 @@ static int _check_autoactivation(struct cmd_context *cmd, struct vgchange_params
}
vp->vg_complete_to_activate = 1;
cmd->use_hints = 0;
get_single_vgname_cmd_arg(cmd, NULL, &vgname);
/*
* Special label scan optimized for autoactivation that is based on
* info read from /run/lvm/ files created by pvscan --cache during
* autoactivation. Add an option to disable this optimization? e.g.
* "online_skip" in --autoactivation / auto_activation_settings
*
* In some cases it might be useful to strictly follow the online
* files, and not fall back to a standard label scan when no pvs or
* incomplete pvs are found from the online files. Add option for
* that? e.g.
* "online_only" in --autoactivation / auto_activation_settings
*
* Generally the way that vgchange -aay --autoactivation event is
* currently used, it will not be called until pvscan --cache has found
* the VG is complete, so it will not generally be following the paths
* that fall back to standard label_scan.
*
* TODO: Like pvscan_aa_quick, this could do lock_vol(vgname) before
* label_scan_vg_online, then set cmd->can_use_one_scan=1 to avoid
* rescanning in _vg_read called by process_each_vg.
*/
/*
* Perform label_scan on PVs that are online (per /run/lvm files)
* for the given VG (or when no VG name is given, all online PVs.)
* If this fails, the caller will do a normal process_each_vg without
* optimizations (which will do a full label_scan.)
*/
if (!label_scan_vg_online(cmd, vgname, &found_none, &found_all, &found_incomplete)) {
log_print("PVs online error%s%s, using all devices.", vgname ? " for VG " : "", vgname ?: "");
return 1;
}
/*
* Not the expected usage, activate any VGs that are complete based on
* pvs_online. Only online pvs are used.
*/
if (!vgname) {
*flags |= PROCESS_SKIP_SCAN;
return 1;
}
/*
* The expected and optimal usage, because the udev rule calls
* vgchange -aay --autoactivation event vgname when all PVs
* for vgname are found online. Only online pvs are used.
*/
if (found_all) {
*flags |= PROCESS_SKIP_SCAN;
*vgname_ret = vgname;
return 1;
}
/*
* Possible option to only activate from only online pvs even if they
* are not all found, and not fall back to a full label_scan.
*/
/*
if (online_only) {
log_print("PVs online %s.", found_none ? "not found" : "incomplete");
return vgname ? 0 : 1;
}
*/
/*
* Not expected usage, no online pvs for the vgname were found. The
* caller will fall back to process_each doing a full label_scan to
* look for the VG. (No optimization used.)
*/
if (found_none) {
log_print("PVs online not found for VG %s, using all devices.", vgname);
return 1;
}
/*
* Not expected usage, only some online pvs for the vgname were found.
* The caller will fall back to process_each doing a full label_scan to
* look for all PVs in the VG. (No optimization used.)
*/
if (found_incomplete) {
log_print("PVs online incomplete for VG %s, using all devicess.", vgname);
return 1;
}
/*
* Shouldn't happen, the caller will fall back to standard
* process_each. (No optimization used.)
*/
log_print("PVs online unknown for VG %s, using all devices.", vgname);
return 1;
}
@ -765,7 +861,7 @@ int vgchange(struct cmd_context *cmd, int argc, char **argv)
{
struct vgchange_params vp = { 0 };
struct processing_handle *handle;
char *vgname = NULL;
const char *vgname = NULL;
uint32_t flags = 0;
int ret;
@ -879,62 +975,11 @@ int vgchange(struct cmd_context *cmd, int argc, char **argv)
}
if (arg_is_set(cmd, autoactivation_ARG)) {
int found_none = 0, found_all = 0, found_incomplete = 0;
int skip_command = 0;
if (!_check_autoactivation(cmd, &vp, &skip_command))
if (!_vgchange_autoactivation_setup(cmd, &vp, &skip_command, &vgname, &flags))
return ECMD_FAILED;
if (skip_command)
return ECMD_PROCESSED;
/*
* Special label scan optimized for autoactivation
* that is based on info read from /run/lvm/ files
* created by pvscan --cache during autoactivation.
* Add an option to disable this optimization? e.g.
* "online_skip" in --autoactivation / auto_activation_settings
*
* In some cases it might be useful to strictly follow
* the online files, and not fall back to a standard
* label scan when no pvs or incomplete pvs are found
* from the online files. Add option for that? e.g.
* "online_only" in --autoactivation / auto_activation_settings
*
* Generally the way that vgchange -aay --autoactivation event
* is currently used, it will not be called until pvscan --cache
* has found the VG is complete, so it will not generally be
* following the paths that fall back to standard label_scan.
*
* TODO: Like pvscan_aa_quick, this could do lock_vol(vgname)
* before label_scan_vg_online, then set cmd->can_use_one_scan=1
* to avoid rescanning in _vg_read called by process_each_vg.
*/
get_single_vgname_cmd_arg(cmd, NULL, &vgname);
if (!label_scan_vg_online(cmd, vgname, &found_none, &found_all, &found_incomplete)) {
log_print("PVs online error%s%s, using all devices.", vgname ? " for VG " : "", vgname ?: "");
} else {
if (!vgname) {
/* Not expected usage, activate any VGs that are complete based on pvs_online. */
flags |= PROCESS_SKIP_SCAN;
} else if (found_all) {
/* The expected and optimal usage, only online PVs are read. */
flags |= PROCESS_SKIP_SCAN;
/*
} else if (online_only) {
log_print("PVs online %s.", found_none ? "not found" : "incomplete");
return vgname ? ECMD_FAILED : ECMD_PROCESSED;
*/
} else if (found_none) {
/* Not expected usage, use full label_scan in process_each */
log_print("PVs online not found for VG %s, using all devices.", vgname);
} else if (found_incomplete) {
/* Not expected usage, use full label_scan in process_each */
log_print("PVs online incomplete for VG %s, using all devicess.", vgname);
} else {
/* Shouldn't happen */
log_print("PVs online unknown for VG %s, using all devices.", vgname);
}
}
}
if (update)
@ -949,7 +994,7 @@ int vgchange(struct cmd_context *cmd, int argc, char **argv)
handle->custom_handle = &vp;
ret = process_each_vg(cmd, argc, argv, NULL, NULL, flags, 0, handle, &_vgchange_single);
ret = process_each_vg(cmd, argc, argv, vgname, NULL, flags, 0, handle, &_vgchange_single);
destroy_processing_handle(cmd, handle);
return ret;