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Move udev_only logic inside stacked node op code.

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(We still need to treat add+readhead+del as a no-op.)
Rename udev_fallback to verify_udev_operations.
Rename --udevfallback to --verifyudev
This commit is contained in:
Alasdair Kergon 2011-06-27 21:43:58 +00:00
parent 94bb67ab37
commit 0437bccc3c
11 changed files with 110 additions and 86 deletions
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2
WHATS_NEW
View File

@ -3,7 +3,7 @@ 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.
Disable udev fallback by default and add activation/udev_fallback to lvm.conf.
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.
Remove useless test of ACTIVATE_EXCL in lv_add_mirrors() clustered code path.

4
WHATS_NEW_DM
View File

@ -1,7 +1,7 @@
Version 1.02.65 -
==================================
Return immediately dm_lib_exit() if called more than once.
Disable udev fallback by default and add --udevfallback option to dmsetup.
Return immediately from dm_lib_exit() if called more than once.
Disable udev fallback by default and add --verifyudev option to dmsetup.
Warn if a table is loaded while a device is known to be in suspended state.
Add dm_get_suspended_counter() for number of devs in suspended state by lib.
Fix "all" report field prefix matching to include label fields with pv_all.

11
doc/example.conf.in
View File

@ -428,12 +428,11 @@ activation {
# while any logical volumes are active.
udev_rules = 1
# Set to 1 to enable udev fallback. This will enable additional checks and
# possible repairs done on entries in the device directory after udev has
# completed processing the events. This is normally not needed if udev
# works correctly but it may be used in some problematic situations or
# for debugging purposes.
udev_fallback = 0
# Set to 1 for LVM2 to verify operations performed by udev. This turns on
# additional checks (and if necessary, repairs) on entries in the device
# directory after udev has completed processing its events.
# Useful for diagnosing problems with LVM2/udev interactions.
verify_udev_operations = 0
# How to fill in missing stripes if activating an incomplete volume.
# Using "error" will make inaccessible parts of the device return

4
lib/commands/toolcontext.c
View File

@ -293,8 +293,8 @@ static int _process_config(struct cmd_context *cmd)
* without any fallback.
*/
cmd->default_settings.udev_fallback = cmd->default_settings.udev_rules ?
find_config_tree_int(cmd, "activation/udev_fallback",
DEFAULT_UDEV_FALLBACK) : 1;
find_config_tree_int(cmd, "activation/verify_udev_operations",
DEFAULT_VERIFY_UDEV_OPERATIONS) : 1;
#else
/* We must use old node/symlink creation code if not compiled with udev support at all! */
cmd->default_settings.udev_fallback = 1;

2
lib/config/defaults.h
View File

@ -78,7 +78,7 @@
#define DEFAULT_READ_AHEAD "auto"
#define DEFAULT_UDEV_RULES 1
#define DEFAULT_UDEV_SYNC 0
#define DEFAULT_UDEV_FALLBACK 0
#define DEFAULT_VERIFY_UDEV_OPERATIONS 0
#define DEFAULT_EXTENT_SIZE 4096 /* In KB */
#define DEFAULT_MAX_PV 0
#define DEFAULT_MAX_LV 0

29
libdm/ioctl/libdm-iface.c
View File

@ -2025,7 +2025,7 @@ int dm_task_run(struct dm_task *dmt)
struct dm_ioctl *dmi;
unsigned command;
int check_udev;
int udev_only;
int rely_on_udev;
int suspended_counter;
#ifdef DM_COMPAT
@ -2097,40 +2097,43 @@ repeat_ioctl:
}
}
/*
* Are we expecting a udev operation to occur that we need to check for?
*/
check_udev = dmt->cookie_set &&
!(dmt->event_nr >> DM_UDEV_FLAGS_SHIFT &
DM_UDEV_DISABLE_DM_RULES_FLAG);
udev_only = dmt->cookie_set ? (dmt->event_nr >> DM_UDEV_FLAGS_SHIFT &
DM_UDEV_DISABLE_LIBRARY_FALLBACK) : 0;
rely_on_udev = dmt->cookie_set ? (dmt->event_nr >> DM_UDEV_FLAGS_SHIFT &
DM_UDEV_DISABLE_LIBRARY_FALLBACK) : 0;
switch (dmt->type) {
case DM_DEVICE_CREATE:
if ((dmt->add_node == DM_ADD_NODE_ON_CREATE) &&
dmt->dev_name && *dmt->dev_name && !udev_only)
dmt->dev_name && *dmt->dev_name && !rely_on_udev)
add_dev_node(dmt->dev_name, MAJOR(dmi->dev),
MINOR(dmi->dev), dmt->uid, dmt->gid,
dmt->mode, check_udev);
dmt->mode, check_udev, rely_on_udev);
break;
case DM_DEVICE_REMOVE:
/* FIXME Kernel needs to fill in dmi->name */
if (dmt->dev_name && !udev_only)
rm_dev_node(dmt->dev_name, check_udev);
if (dmt->dev_name && !rely_on_udev)
rm_dev_node(dmt->dev_name, check_udev, rely_on_udev);
break;
case DM_DEVICE_RENAME:
/* FIXME Kernel needs to fill in dmi->name */
if (!dmt->new_uuid && dmt->dev_name && !udev_only)
if (!dmt->new_uuid && dmt->dev_name)
rename_dev_node(dmt->dev_name, dmt->newname,
check_udev);
check_udev, rely_on_udev);
break;
case DM_DEVICE_RESUME:
if ((dmt->add_node == DM_ADD_NODE_ON_RESUME) &&
dmt->dev_name && *dmt->dev_name && !udev_only)
dmt->dev_name && *dmt->dev_name)
add_dev_node(dmt->dev_name, MAJOR(dmi->dev),
MINOR(dmi->dev), dmt->uid, dmt->gid,
dmt->mode, check_udev);
dmt->mode, check_udev, rely_on_udev);
/* FIXME Kernel needs to fill in dmi->name */
set_dev_node_read_ahead(dmt->dev_name, dmt->read_ahead,
dmt->read_ahead_flags);
@ -2140,9 +2143,9 @@ repeat_ioctl:
if (dmi->flags & DM_EXISTS_FLAG)
add_dev_node(dmi->name, MAJOR(dmi->dev),
MINOR(dmi->dev), dmt->uid,
dmt->gid, dmt->mode, 0);
dmt->gid, dmt->mode, 0, rely_on_udev);
else if (dmt->dev_name)
rm_dev_node(dmt->dev_name, 0);
rm_dev_node(dmt->dev_name, 0, rely_on_udev);
break;
case DM_DEVICE_STATUS:

115
libdm/libdm-common.c
View File

@ -501,8 +501,13 @@ void selinux_release(void)
#endif
}
static int _warn_if_op_needed(int warn_if_udev_failed)
{
return warn_if_udev_failed && dm_udev_get_sync_support() && dm_udev_get_checking();
}
static int _add_dev_node(const char *dev_name, uint32_t major, uint32_t minor,
uid_t uid, gid_t gid, mode_t mode, int check_udev)
uid_t uid, gid_t gid, mode_t mode, int warn_if_udev_failed)
{
char path[PATH_MAX];
struct stat info;
@ -527,8 +532,7 @@ static int _add_dev_node(const char *dev_name, uint32_t major, uint32_t minor,
dev_name);
return 0;
}
} else if (dm_udev_get_sync_support() && dm_udev_get_checking() &&
check_udev)
} else if (_warn_if_op_needed(warn_if_udev_failed))
log_warn("%s not set up by udev: Falling back to direct "
"node creation.", path);
@ -553,7 +557,7 @@ static int _add_dev_node(const char *dev_name, uint32_t major, uint32_t minor,
return 1;
}
static int _rm_dev_node(const char *dev_name, int check_udev)
static int _rm_dev_node(const char *dev_name, int warn_if_udev_failed)
{
char path[PATH_MAX];
struct stat info;
@ -562,8 +566,7 @@ static int _rm_dev_node(const char *dev_name, int check_udev)
if (stat(path, &info) < 0)
return 1;
else if (dm_udev_get_sync_support() && dm_udev_get_checking() &&
check_udev)
else if (_warn_if_op_needed(warn_if_udev_failed))
log_warn("Node %s was not removed by udev. "
"Falling back to direct node removal.", path);
@ -578,7 +581,7 @@ static int _rm_dev_node(const char *dev_name, int check_udev)
}
static int _rename_dev_node(const char *old_name, const char *new_name,
int check_udev)
int warn_if_udev_failed)
{
char oldpath[PATH_MAX];
char newpath[PATH_MAX];
@ -593,8 +596,7 @@ static int _rename_dev_node(const char *old_name, const char *new_name,
"is already present", newpath);
return 0;
}
else if (dm_udev_get_sync_support() && dm_udev_get_checking() &&
check_udev) {
else if (_warn_if_op_needed(warn_if_udev_failed)) {
if (stat(oldpath, &info) < 0 &&
errno == ENOENT)
/* assume udev already deleted this */
@ -618,8 +620,7 @@ static int _rename_dev_node(const char *old_name, const char *new_name,
return 0;
}
}
else if (dm_udev_get_sync_support() && dm_udev_get_checking() &&
check_udev)
else if (_warn_if_op_needed(warn_if_udev_failed))
log_warn("The node %s should have been renamed to %s "
"by udev but new node is not present. "
"Falling back to direct node rename.",
@ -759,16 +760,16 @@ typedef enum {
static int _do_node_op(node_op_t type, const char *dev_name, uint32_t major,
uint32_t minor, uid_t uid, gid_t gid, mode_t mode,
const char *old_name, uint32_t read_ahead,
uint32_t read_ahead_flags, int check_udev)
uint32_t read_ahead_flags, int warn_if_udev_failed)
{
switch (type) {
case NODE_ADD:
return _add_dev_node(dev_name, major, minor, uid, gid,
mode, check_udev);
mode, warn_if_udev_failed);
case NODE_DEL:
return _rm_dev_node(dev_name, check_udev);
return _rm_dev_node(dev_name, warn_if_udev_failed);
case NODE_RENAME:
return _rename_dev_node(old_name, dev_name, check_udev);
return _rename_dev_node(old_name, dev_name, warn_if_udev_failed);
case NODE_READ_AHEAD:
return _set_dev_node_read_ahead(dev_name, read_ahead,
read_ahead_flags);
@ -794,7 +795,8 @@ struct node_op_parms {
uint32_t read_ahead;
uint32_t read_ahead_flags;
char *old_name;
int check_udev;
int warn_if_udev_failed;
unsigned rely_on_udev;
char names[0];
};
@ -824,16 +826,33 @@ static int _other_node_ops(node_op_t type)
return 0;
}
/* Check if udev is supposed to create nodes */
static int _check_udev(int check_udev)
static void _log_node_op(const char *action_str, struct node_op_parms *nop)
{
return check_udev && dm_udev_get_sync_support() && dm_udev_get_checking();
switch (nop->type) {
case NODE_ADD:
log_debug("%s: %s NODE_ADD (%" PRIu32 ",%" PRIu32 ") %u:%u 0%o",
nop->dev_name, action_str, nop->major, nop->minor, nop->uid, nop->gid, nop->mode);
break;
case NODE_DEL:
log_debug("%s: %s NODE_DEL", nop->dev_name, action_str);
break;
case NODE_RENAME:
log_debug("%s: %s NODE_RENAME to %s", nop->old_name, action_str, nop->dev_name);
break;
case NODE_READ_AHEAD:
log_debug("%s: %s NODE_READ_AHEAD %" PRIu32 " (flags=%" PRIu32
")", nop->dev_name, action_str, nop->read_ahead, nop->read_ahead_flags);
break;
default:
; /* NOTREACHED */
}
}
static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
uint32_t minor, uid_t uid, gid_t gid, mode_t mode,
const char *old_name, uint32_t read_ahead,
uint32_t read_ahead_flags, int check_udev)
uint32_t read_ahead_flags, int warn_if_udev_failed,
unsigned rely_on_udev)
{
struct node_op_parms *nop;
struct dm_list *noph, *nopht;
@ -841,7 +860,7 @@ static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
char *pos;
/*
* Note: check_udev must have valid content
* Note: warn_if_udev_failed must have valid content
*/
if ((type == NODE_DEL) && _other_node_ops(type))
/*
@ -850,27 +869,29 @@ static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
dm_list_iterate_safe(noph, nopht, &_node_ops) {
nop = dm_list_item(noph, struct node_op_parms);
if (!strcmp(dev_name, nop->dev_name)) {
_log_node_op("Unstacking", nop);
_del_node_op(nop);
if (!_other_node_ops(type))
break; /* no other non DEL ops */
}
}
else if ((type == NODE_ADD) && _count_node_ops[NODE_DEL] && _check_udev(check_udev))
else if ((type == NODE_ADD) && _count_node_ops[NODE_DEL])
/*
* If udev is running ignore previous DEL operation on added node.
* Ignore previous DEL operation on added node.
* (No other operations for this device then DEL could be stacked here).
*/
dm_list_iterate_safe(noph, nopht, &_node_ops) {
nop = dm_list_item(noph, struct node_op_parms);
if ((nop->type == NODE_DEL) &&
!strcmp(dev_name, nop->dev_name)) {
_log_node_op("Unstacking", nop);
_del_node_op(nop);
break; /* no other DEL ops */
}
}
else if ((type == NODE_RENAME) && _check_udev(check_udev))
else if ((type == NODE_RENAME))
/*
* If udev is running ignore any outstanding operations if renaming it.
* Ignore any outstanding operations if renaming it.
*
* Currently RENAME operation happens through 'suspend -> resume'.
* On 'resume' device is added with read_ahead settings, so it is
@ -880,6 +901,7 @@ static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
dm_list_iterate_safe(noph, nopht, &_node_ops) {
nop = dm_list_item(noph, struct node_op_parms);
if (!strcmp(old_name, nop->dev_name))
_log_node_op("Unstacking", nop);
_del_node_op(nop);
}
@ -897,7 +919,8 @@ static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
nop->mode = mode;
nop->read_ahead = read_ahead;
nop->read_ahead_flags = read_ahead_flags;
nop->check_udev = check_udev;
nop->warn_if_udev_failed = warn_if_udev_failed;
nop->rely_on_udev = rely_on_udev;
_store_str(&pos, &nop->dev_name, dev_name);
_store_str(&pos, &nop->old_name, old_name);
@ -905,6 +928,8 @@ static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
_count_node_ops[type]++;
dm_list_add(&_node_ops, &nop->list);
_log_node_op("Stacking", nop);
return 1;
}
@ -915,38 +940,35 @@ static void _pop_node_ops(void)
dm_list_iterate_safe(noph, nopht, &_node_ops) {
nop = dm_list_item(noph, struct node_op_parms);
_do_node_op(nop->type, nop->dev_name, nop->major, nop->minor,
nop->uid, nop->gid, nop->mode, nop->old_name,
nop->read_ahead, nop->read_ahead_flags,
nop->check_udev);
if (!nop->rely_on_udev) {
_log_node_op("Processing", nop);
_do_node_op(nop->type, nop->dev_name, nop->major, nop->minor,
nop->uid, nop->gid, nop->mode, nop->old_name,
nop->read_ahead, nop->read_ahead_flags,
nop->warn_if_udev_failed);
} else
_log_node_op("Skipping (udev)", nop);
_del_node_op(nop);
}
}
int add_dev_node(const char *dev_name, uint32_t major, uint32_t minor,
uid_t uid, gid_t gid, mode_t mode, int check_udev)
uid_t uid, gid_t gid, mode_t mode, int check_udev, unsigned rely_on_udev)
{
log_debug("%s: Stacking NODE_ADD (%" PRIu32 ",%" PRIu32 ") %u:%u 0%o",
dev_name, major, minor, uid, gid, mode);
return _stack_node_op(NODE_ADD, dev_name, major, minor, uid,
gid, mode, "", 0, 0, check_udev);
gid, mode, "", 0, 0, check_udev, rely_on_udev);
}
int rename_dev_node(const char *old_name, const char *new_name, int check_udev)
int rename_dev_node(const char *old_name, const char *new_name, int check_udev, unsigned rely_on_udev)
{
log_debug("%s: Stacking NODE_RENAME to %s", old_name, new_name);
return _stack_node_op(NODE_RENAME, new_name, 0, 0, 0,
0, 0, old_name, 0, 0, check_udev);
0, 0, old_name, 0, 0, check_udev, rely_on_udev);
}
int rm_dev_node(const char *dev_name, int check_udev)
int rm_dev_node(const char *dev_name, int check_udev, unsigned rely_on_udev)
{
log_debug("%s: Stacking NODE_DEL (replaces other stacked ops)", dev_name);
return _stack_node_op(NODE_DEL, dev_name, 0, 0, 0,
0, 0, "", 0, 0, check_udev);
0, 0, "", 0, 0, check_udev, rely_on_udev);
}
int set_dev_node_read_ahead(const char *dev_name, uint32_t read_ahead,
@ -955,11 +977,8 @@ int set_dev_node_read_ahead(const char *dev_name, uint32_t read_ahead,
if (read_ahead == DM_READ_AHEAD_AUTO)
return 1;
log_debug("%s: Stacking NODE_READ_AHEAD %" PRIu32 " (flags=%" PRIu32
")", dev_name, read_ahead, read_ahead_flags);
return _stack_node_op(NODE_READ_AHEAD, dev_name, 0, 0, 0, 0,
0, "", read_ahead, read_ahead_flags, 0);
0, "", read_ahead, read_ahead_flags, 0, 0);
}
void update_devs(void)
@ -1428,7 +1447,7 @@ static int _udev_wait(uint32_t cookie)
return 0;
}
log_debug("Udev cookie 0x%" PRIx32 " (semid %d): Waiting for zero",
log_debug("Udev cookie 0x%" PRIx32 " (semid %d) waiting for zero",
cookie, semid);
repeat_wait:

6
libdm/libdm-common.h
View File

@ -23,10 +23,10 @@ struct target *create_target(uint64_t start,
const char *type, const char *params);
int add_dev_node(const char *dev_name, uint32_t minor, uint32_t major,
uid_t uid, gid_t gid, mode_t mode, int check_udev);
int rm_dev_node(const char *dev_name, int check_udev);
uid_t uid, gid_t gid, mode_t mode, int check_udev, unsigned rely_on_udev);
int rm_dev_node(const char *dev_name, int check_udev, unsigned rely_on_udev);
int rename_dev_node(const char *old_name, const char *new_name,
int check_udev);
int check_udev, unsigned rely_on_udev);
int get_dev_node_read_ahead(const char *dev_name, uint32_t *read_ahead);
int set_dev_node_read_ahead(const char *dev_name, uint32_t read_ahead,
uint32_t read_ahead_flags);

7
libdm/libdm-deptree.c
View File

@ -983,10 +983,9 @@ static int _deactivate_node(const char *name, uint32_t major, uint32_t minor,
r = dm_task_run(dmt);
/* FIXME Until kernel returns actual name so dm-ioctl.c can handle it */
if (!(udev_flags & DM_UDEV_DISABLE_LIBRARY_FALLBACK))
rm_dev_node(name, dmt->cookie_set &&
!(udev_flags & DM_UDEV_DISABLE_DM_RULES_FLAG));
/* FIXME Until kernel returns actual name so dm-iface.c can handle it */
rm_dev_node(name, dmt->cookie_set && !(udev_flags & DM_UDEV_DISABLE_DM_RULES_FLAG),
dmt->cookie_set && !(udev_flags & DM_UDEV_DISABLE_LIBRARY_FALLBACK));
/* FIXME Remove node from tree or mark invalid? */

4
man/dmsetup.8.in
View File

@ -181,6 +181,10 @@ Answer yes to all prompts automatically.
.IP \fB-v|--verbose\ [-v|--verbose]
.br
Produce additional output.
.IP \fB--verifyudev
If udev synchronisation is enabled, verify that udev operations get performed
correctly and try to fix up the device nodes afterwards if not.
.br
.IP \fB--version
.br
Display the library and kernel driver version.

12
tools/dmsetup.c
View File

@ -135,7 +135,6 @@ enum {
UDEVCOOKIE_ARG,
NOUDEVRULES_ARG,
NOUDEVSYNC_ARG,
UDEVFALLBACK_ARG,
OPTIONS_ARG,
READAHEAD_ARG,
ROWS_ARG,
@ -151,6 +150,7 @@ enum {
UNQUOTED_ARG,
UUID_ARG,
VERBOSE_ARG,
VERIFYUDEV_ARG,
VERSION_ARG,
YES_ARG,
ADD_NODE_ON_RESUME_ARG,
@ -1007,7 +1007,7 @@ static int _set_up_udev_support(const char *dev_dir)
else
dirs_diff = strcmp(dev_dir, udev_dev_dir);
_udev_only = !dirs_diff && (_udev_cookie || !_switches[UDEVFALLBACK_ARG]);
_udev_only = !dirs_diff && (_udev_cookie || !_switches[VERIFYUDEV_ARG]);
if (dirs_diff) {
log_debug("The path %s used for creating device nodes that is "
@ -2745,7 +2745,7 @@ static void _usage(FILE *out)
fprintf(out, "dmsetup [--version] [-h|--help [-c|-C|--columns]]\n"
" [-v|--verbose [-v|--verbose ...]]\n"
" [-r|--readonly] [--noopencount] [--nolockfs] [--inactive]\n"
" [--udevcookie] [--noudevrules] [--noudevsync] [--udevfallback]\n"
" [--udevcookie] [--noudevrules] [--noudevsync] [--verifyudev]\n"
" [-y|--yes] [--readahead [+]<sectors>|auto|none]\n"
" [-c|-C|--columns] [-o <fields>] [-O|--sort <sort_fields>]\n"
" [--nameprefixes] [--noheadings] [--separator <separator>]\n\n");
@ -3116,7 +3116,6 @@ static int _process_switches(int *argc, char ***argv, const char *dev_dir)
{"udevcookie", 1, &ind, UDEVCOOKIE_ARG},
{"noudevrules", 0, &ind, NOUDEVRULES_ARG},
{"noudevsync", 0, &ind, NOUDEVSYNC_ARG},
{"udevfallback", 0, &ind, UDEVFALLBACK_ARG},
{"options", 1, &ind, OPTIONS_ARG},
{"readahead", 1, &ind, READAHEAD_ARG},
{"rows", 0, &ind, ROWS_ARG},
@ -3132,6 +3131,7 @@ static int _process_switches(int *argc, char ***argv, const char *dev_dir)
{"unbuffered", 0, &ind, UNBUFFERED_ARG},
{"unquoted", 0, &ind, UNQUOTED_ARG},
{"verbose", 1, &ind, VERBOSE_ARG},
{"verifyudev", 0, &ind, VERIFYUDEV_ARG},
{"version", 0, &ind, VERSION_ARG},
{"yes", 0, &ind, YES_ARG},
{"addnodeonresume", 0, &ind, ADD_NODE_ON_RESUME_ARG},
@ -3245,8 +3245,8 @@ static int _process_switches(int *argc, char ***argv, const char *dev_dir)
_switches[NOUDEVRULES_ARG]++;
if (ind == NOUDEVSYNC_ARG)
_switches[NOUDEVSYNC_ARG]++;
if (ind == UDEVFALLBACK_ARG)
_switches[UDEVFALLBACK_ARG]++;
if (ind == VERIFYUDEV_ARG)
_switches[VERIFYUDEV_ARG]++;
if (c == 'G' || ind == GID_ARG) {
_switches[GID_ARG]++;
_int_args[GID_ARG] = atoi(optarg);