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lvm2/SOURCES/0002-Revert-pvscan-only-add...

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From 2091305b796d5552fd991c527a0359a0b4d8fde0 Mon Sep 17 00:00:00 2001
From: David Teigland <teigland@redhat.com>
Date: Mon, 20 Dec 2021 13:38:23 -0600
Subject: [PATCH 02/54] Revert "pvscan: only add device args to dev cache"
This reverts commit 33e47182f773c1a902b533580b63a803906de55d.
---
lib/device/dev-cache.c | 204 +++-----------------------------
lib/device/dev-cache.h | 6 +-
lib/device/device_id.c | 27 ++---
lib/device/device_id.h | 1 -
test/shell/devicesfile-basic.sh | 2 +-
tools/pvscan.c | 58 ++++-----
6 files changed, 52 insertions(+), 246 deletions(-)
diff --git a/lib/device/dev-cache.c b/lib/device/dev-cache.c
index 33b75a9a9..c6e5f68cf 100644
--- a/lib/device/dev-cache.c
+++ b/lib/device/dev-cache.c
@@ -1852,7 +1852,7 @@ int setup_devices_file(struct cmd_context *cmd)
* Add all system devices to dev-cache, and attempt to
* match all devices_file entries to dev-cache entries.
*/
-int setup_devices(struct cmd_context *cmd)
+static int _setup_devices(struct cmd_context *cmd, int no_file_match)
{
int file_exists;
int lock_mode = 0;
@@ -1979,6 +1979,13 @@ int setup_devices(struct cmd_context *cmd)
*/
dev_cache_scan(cmd);
+ /*
+ * The caller uses "no_file_match" if it wants to match specific devs
+ * itself, instead of matching everything in device_ids_match.
+ */
+ if (no_file_match && cmd->enable_devices_file)
+ return 1;
+
/*
* Match entries from cmd->use_devices with device structs in dev-cache.
*/
@@ -1987,6 +1994,16 @@ int setup_devices(struct cmd_context *cmd)
return 1;
}
+int setup_devices(struct cmd_context *cmd)
+{
+ return _setup_devices(cmd, 0);
+}
+
+int setup_devices_no_file_match(struct cmd_context *cmd)
+{
+ return _setup_devices(cmd, 1);
+}
+
/*
* The alternative to setup_devices() when the command is interested
* in using only one PV.
@@ -2055,188 +2072,3 @@ int setup_device(struct cmd_context *cmd, const char *devname)
return 1;
}
-/*
- * pvscan --cache is specialized/optimized to look only at command args,
- * so this just sets up the devices file, then individual devices are
- * added to dev-cache and matched with device_ids later in pvscan.
- */
-
-int setup_devices_for_pvscan_cache(struct cmd_context *cmd)
-{
- if (cmd->enable_devices_list) {
- if (!_setup_devices_list(cmd))
- return_0;
- return 1;
- }
-
- if (!setup_devices_file(cmd))
- return_0;
-
- if (!cmd->enable_devices_file)
- return 1;
-
- if (!devices_file_exists(cmd)) {
- log_debug("Devices file not found, ignoring.");
- cmd->enable_devices_file = 0;
- return 1;
- }
-
- if (!lock_devices_file(cmd, LOCK_SH)) {
- log_error("Failed to lock the devices file to read.");
- return 0;
- }
-
- if (!device_ids_read(cmd)) {
- log_error("Failed to read the devices file.");
- unlock_devices_file(cmd);
- return 0;
- }
-
- unlock_devices_file(cmd);
- return 1;
-}
-
-
-/* Get a device name from a devno. */
-
-static char *_get_devname_from_devno(struct cmd_context *cmd, dev_t devno)
-{
- char path[PATH_MAX];
- char devname[PATH_MAX];
- char namebuf[NAME_LEN];
- char line[1024];
- int major = MAJOR(devno);
- int minor = MINOR(devno);
- int line_major;
- int line_minor;
- uint64_t line_blocks;
- DIR *dir;
- struct dirent *dirent;
- FILE *fp;
-
- /*
- * $ ls /sys/dev/block/8:0/device/block/
- * sda
- */
- if (major_is_scsi_device(cmd->dev_types, major)) {
- if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d/device/block",
- dm_sysfs_dir(), major, minor) < 0) {
- return NULL;
- }
-
- if (!(dir = opendir(path)))
- return NULL;
-
- while ((dirent = readdir(dir))) {
- if (dirent->d_name[0] == '.')
- continue;
- if (dm_snprintf(devname, sizeof(devname), "/dev/%s", dirent->d_name) < 0) {
- devname[0] = '\0';
- stack;
- }
- break;
- }
- closedir(dir);
-
- if (devname[0]) {
- log_debug("Found %s for %d:%d from sys", devname, major, minor);
- return _strdup(devname);
- }
- return NULL;
- }
-
- /*
- * $ cat /sys/dev/block/253:3/dm/name
- * mpatha
- */
- if (major == cmd->dev_types->device_mapper_major) {
- if (dm_snprintf(path, sizeof(path), "%sdev/block/%d:%d/dm/name",
- dm_sysfs_dir(), major, minor) < 0) {
- return NULL;
- }
-
- if (!get_sysfs_value(path, namebuf, sizeof(namebuf), 0))
- return NULL;
-
- if (dm_snprintf(devname, sizeof(devname), "/dev/mapper/%s", namebuf) < 0) {
- devname[0] = '\0';
- stack;
- }
-
- if (devname[0]) {
- log_debug("Found %s for %d:%d from sys", devname, major, minor);
- return _strdup(devname);
- }
- return NULL;
- }
-
- /*
- * /proc/partitions lists
- * major minor #blocks name
- */
-
- if (!(fp = fopen("/proc/partitions", "r")))
- return NULL;
-
- while (fgets(line, sizeof(line), fp)) {
- if (sscanf(line, "%u %u %llu %s", &line_major, &line_minor, (unsigned long long *)&line_blocks, namebuf) != 4)
- continue;
- if (line_major != major)
- continue;
- if (line_minor != minor)
- continue;
-
- if (dm_snprintf(devname, sizeof(devname), "/dev/%s", namebuf) < 0) {
- devname[0] = '\0';
- stack;
- }
- break;
- }
- fclose(fp);
-
- if (devname[0]) {
- log_debug("Found %s for %d:%d from proc", devname, major, minor);
- return _strdup(devname);
- }
-
- /*
- * If necessary, this could continue searching by stat'ing /dev entries.
- */
-
- return NULL;
-}
-
-int setup_devname_in_dev_cache(struct cmd_context *cmd, const char *devname)
-{
- struct stat buf;
- struct device *dev;
-
- if (stat(devname, &buf) < 0) {
- log_error("Cannot access device %s.", devname);
- return 0;
- }
-
- if (!S_ISBLK(buf.st_mode)) {
- log_error("Invaild device type %s.", devname);
- return 0;
- }
-
- if (!_insert_dev(devname, buf.st_rdev))
- return_0;
-
- if (!(dev = (struct device *) dm_hash_lookup(_cache.names, devname)))
- return_0;
-
- return 1;
-}
-
-int setup_devno_in_dev_cache(struct cmd_context *cmd, dev_t devno)
-{
- const char *devname;
-
- if (!(devname = _get_devname_from_devno(cmd, devno)))
- return_0;
-
- return setup_devname_in_dev_cache(cmd, devname);
-}
-
diff --git a/lib/device/dev-cache.h b/lib/device/dev-cache.h
index 143848d6d..635dc4fc9 100644
--- a/lib/device/dev-cache.h
+++ b/lib/device/dev-cache.h
@@ -77,11 +77,7 @@ int get_dm_uuid_from_sysfs(char *buf, size_t buf_size, int major, int minor);
int setup_devices_file(struct cmd_context *cmd);
int setup_devices(struct cmd_context *cmd);
+int setup_devices_no_file_match(struct cmd_context *cmd);
int setup_device(struct cmd_context *cmd, const char *devname);
-/* Normal device setup functions are split up for pvscan optimization. */
-int setup_devices_for_pvscan_cache(struct cmd_context *cmd);
-int setup_devname_in_dev_cache(struct cmd_context *cmd, const char *devname);
-int setup_devno_in_dev_cache(struct cmd_context *cmd, dev_t devno);
-
#endif
diff --git a/lib/device/device_id.c b/lib/device/device_id.c
index 167bf661b..eb06109ff 100644
--- a/lib/device/device_id.c
+++ b/lib/device/device_id.c
@@ -1534,22 +1534,6 @@ int device_ids_match_dev(struct cmd_context *cmd, struct device *dev)
* passes the filter.
*/
-void device_ids_match_device_list(struct cmd_context *cmd)
-{
- struct dev_use *du;
-
- dm_list_iterate_items(du, &cmd->use_devices) {
- if (du->dev)
- continue;
- if (!(du->dev = dev_cache_get(cmd, du->devname, NULL))) {
- log_warn("Device not found for %s.", du->devname);
- } else {
- /* Should we set dev->id? Which idtype? Use --deviceidtype? */
- du->dev->flags |= DEV_MATCHED_USE_ID;
- }
- }
-}
-
void device_ids_match(struct cmd_context *cmd)
{
struct dev_iter *iter;
@@ -1557,7 +1541,16 @@ void device_ids_match(struct cmd_context *cmd)
struct device *dev;
if (cmd->enable_devices_list) {
- device_ids_match_device_list(cmd);
+ dm_list_iterate_items(du, &cmd->use_devices) {
+ if (du->dev)
+ continue;
+ if (!(du->dev = dev_cache_get(cmd, du->devname, NULL))) {
+ log_warn("Device not found for %s.", du->devname);
+ } else {
+ /* Should we set dev->id? Which idtype? Use --deviceidtype? */
+ du->dev->flags |= DEV_MATCHED_USE_ID;
+ }
+ }
return;
}
diff --git a/lib/device/device_id.h b/lib/device/device_id.h
index 0ada35c94..939b3a0f4 100644
--- a/lib/device/device_id.h
+++ b/lib/device/device_id.h
@@ -32,7 +32,6 @@ int device_id_add(struct cmd_context *cmd, struct device *dev, const char *pvid,
void device_id_pvremove(struct cmd_context *cmd, struct device *dev);
void device_ids_match(struct cmd_context *cmd);
int device_ids_match_dev(struct cmd_context *cmd, struct device *dev);
-void device_ids_match_device_list(struct cmd_context *cmd);
void device_ids_validate(struct cmd_context *cmd, struct dm_list *scanned_devs, int *device_ids_invalid, int noupdate);
int device_ids_version_unchanged(struct cmd_context *cmd);
void device_ids_find_renamed_devs(struct cmd_context *cmd, struct dm_list *dev_list, int *search_count, int noupdate);
diff --git a/test/shell/devicesfile-basic.sh b/test/shell/devicesfile-basic.sh
index 9c3455c76..7ba9e2c7f 100644
--- a/test/shell/devicesfile-basic.sh
+++ b/test/shell/devicesfile-basic.sh
@@ -283,7 +283,7 @@ not ls "$RUNDIR/lvm/pvs_online/$PVID3"
# arg in devices list
_clear_online_files
pvscan --devices "$dev3" --cache -aay "$dev3"
-pvscan --devices "$dev4","$dev3" --cache -aay "$dev4"
+pvscan --devices "$dev4" --cache -aay "$dev4"
check lv_field $vg2/$lv2 lv_active "active"
vgchange -an $vg2
diff --git a/tools/pvscan.c b/tools/pvscan.c
index 95d593d57..8e2611361 100644
--- a/tools/pvscan.c
+++ b/tools/pvscan.c
@@ -857,21 +857,11 @@ static int _get_devs_from_saved_vg(struct cmd_context *cmd, const char *vgname,
devno = MKDEV(file_major, file_minor);
- if (!setup_devno_in_dev_cache(cmd, devno)) {
- log_error_pvscan(cmd, "No device set up for %d:%d PVID %s", file_major, file_minor, pvid);
- goto bad;
- }
-
if (!(dev = dev_cache_get_by_devt(cmd, devno, NULL, NULL))) {
log_error_pvscan(cmd, "No device found for %d:%d PVID %s", file_major, file_minor, pvid);
goto bad;
}
- /*
- * Do not need to match device_id here, see comment after
- * get_devs_from_saved_vg about relying on pvid online file.
- */
-
name1 = dev_name(dev);
name2 = pvl->pv->device_hint;
@@ -1109,11 +1099,17 @@ static int _pvscan_aa(struct cmd_context *cmd, struct pvscan_aa_params *pp,
* PROCESS_SKIP_SCAN: we have already done lvmcache_label_scan
* so tell process_each to skip it.
*/
+ if (do_all)
+ read_flags |= PROCESS_SKIP_SCAN;
+ /*
+ * When the command is processing specific devs (not all), it
+ * has done setup_devices_no_file_match() to avoid matching ids
+ * fo all devs unnecessarily, but now that we're falling back
+ * to process_each_vg() we need to complete the id matching.
+ */
if (!do_all)
- lvmcache_label_scan(cmd);
-
- read_flags |= PROCESS_SKIP_SCAN;
+ device_ids_match(cmd);
ret = process_each_vg(cmd, 0, NULL, NULL, vgnames, read_flags, 0, handle, _pvscan_aa_single);
}
@@ -1196,15 +1192,11 @@ static int _get_args_devs(struct cmd_context *cmd, struct dm_list *pvscan_args,
/* in common usage, no dev will be found for a devno */
dm_list_iterate_items(arg, pvscan_args) {
- if (arg->devname) {
- if (!setup_devname_in_dev_cache(cmd, arg->devname))
- log_error_pvscan(cmd, "No device set up for name arg %s", arg->devname);
+ if (arg->devname)
arg->dev = dev_cache_get(cmd, arg->devname, NULL);
- } else if (arg->devno) {
- if (!setup_devno_in_dev_cache(cmd, arg->devno))
- log_error_pvscan(cmd, "No device set up for devno arg %d", (int)arg->devno);
+ else if (arg->devno)
arg->dev = dev_cache_get_by_devt(cmd, arg->devno, NULL, NULL);
- } else
+ else
return_0;
}
@@ -1680,13 +1672,11 @@ static int _pvscan_cache_args(struct cmd_context *cmd, int argc, char **argv,
cmd->pvscan_cache_single = 1;
/*
- * Special pvscan-specific setup steps to avoid looking
- * at any devices except for device args.
- * Read devices file and determine if devices file will be used.
- * Does not do dev_cache_scan (adds nothing to dev-cache), and
- * does not do any device id matching.
+ * "no_file_match" means that when the devices file is used,
+ * setup_devices will skip matching devs to devices file entries.
+ * Specific devs must be matched later with device_ids_match_dev().
*/
- if (!setup_devices_for_pvscan_cache(cmd)) {
+ if (!setup_devices_no_file_match(cmd)) {
log_error_pvscan(cmd, "Failed to set up devices.");
return 0;
}
@@ -1745,21 +1735,17 @@ static int _pvscan_cache_args(struct cmd_context *cmd, int argc, char **argv,
log_debug("pvscan_cache_args: filter devs nodata");
/*
- * Match dev args with the devices file because special/optimized
- * device setup was used above which does not check the devices file.
- * If a match fails here do not exclude it, that will be done below by
- * passes_filter() which runs filter-deviceid. The
- * relax_deviceid_filter case needs to be able to work around
+ * Match dev args with the devices file because
+ * setup_devices_no_file_match() was used above which skipped checking
+ * the devices file. If a match fails here do not exclude it, that
+ * will be done below by passes_filter() which runs filter-deviceid.
+ * The relax_deviceid_filter case needs to be able to work around
* unmatching devs.
*/
-
if (cmd->enable_devices_file) {
- dm_list_iterate_items(devl, &pvscan_devs)
+ dm_list_iterate_items_safe(devl, devl2, &pvscan_devs)
device_ids_match_dev(cmd, devl->dev);
-
}
- if (cmd->enable_devices_list)
- device_ids_match_device_list(cmd);
if (cmd->enable_devices_file && device_ids_use_devname(cmd)) {
relax_deviceid_filter = 1;
--
2.34.3
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