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device-mapper.13753
bug-1145231_pvscan-lvmetad-use-udev-info-to-imp...
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File bug-1145231_pvscan-lvmetad-use-udev-info-to-improve-md-component.patch of Package device-mapper.13753
From a188b1e513ed5ca0f5f3702c823490f5610d4495 Mon Sep 17 00:00:00 2001 From: David Teigland <teigland@redhat.com> Date: Fri, 30 Nov 2018 16:32:32 -0600 Subject: [PATCH] pvscan lvmetad: use udev info to improve md component detection When no md devs are started, pvscan will only scan the start of an md component, and if it has a superblock at the end may not exclude it. udev may already have info identifying it as an md component, so use that. --- lib/device/dev-md.c | 14 ++++++++++-- lib/device/dev-type.c | 62 +++++++++++++++++++++++++++++++++++++++++---------- lib/device/dev-type.h | 1 + lib/label/label.c | 6 +++++ tools/pvscan.c | 3 ++- 5 files changed, 71 insertions(+), 15 deletions(-) diff --git a/lib/device/dev-md.c b/lib/device/dev-md.c index 185499baf..972850726 100644 --- a/lib/device/dev-md.c +++ b/lib/device/dev-md.c @@ -190,14 +190,24 @@ out: int dev_is_md(struct device *dev, uint64_t *offset_found, int full) { + int ret; /* * If non-native device status source is selected, use it * only if offset_found is not requested as this * information is not in udev db. */ - if ((dev->ext.src == DEV_EXT_NONE) || offset_found) - return _native_dev_is_md(dev, offset_found, full); + if ((dev->ext.src == DEV_EXT_NONE) || offset_found) { + ret = _native_dev_is_md(dev, offset_found, full); + + if (!full) { + if (!ret || (ret == -EAGAIN)) { + if (udev_dev_is_md_component(dev)) + return 1; + } + } + return ret; + } if (dev->ext.src == DEV_EXT_UDEV) return _udev_dev_is_md(dev); diff --git a/lib/device/dev-type.c b/lib/device/dev-type.c index af4b40760..33ebb73b2 100644 --- a/lib/device/dev-type.c +++ b/lib/device/dev-type.c @@ -1004,25 +1004,23 @@ int dev_is_rotational(struct dev_types *dt, struct device *dev) * failed already due to timeout in udev - in both cases the * udev_device_get_is_initialized returns 0. */ -#define UDEV_DEV_IS_MPATH_COMPONENT_ITERATION_COUNT 100 -#define UDEV_DEV_IS_MPATH_COMPONENT_USLEEP 100000 +#define UDEV_DEV_IS_COMPONENT_ITERATION_COUNT 100 +#define UDEV_DEV_IS_COMPONENT_USLEEP 100000 -int udev_dev_is_mpath_component(struct device *dev) +static struct udev_device *_udev_get_dev(struct device *dev) { struct udev *udev_context = udev_get_library_context(); struct udev_device *udev_device = NULL; - const char *value; int initialized = 0; unsigned i = 0; - int ret = 0; if (!udev_context) { log_warn("WARNING: No udev context available to check if device %s is multipath component.", dev_name(dev)); - return 0; + return NULL; } while (1) { - if (i >= UDEV_DEV_IS_MPATH_COMPONENT_ITERATION_COUNT) + if (i >= UDEV_DEV_IS_COMPONENT_ITERATION_COUNT) break; if (udev_device) @@ -1030,7 +1028,7 @@ int udev_dev_is_mpath_component(struct device *dev) if (!(udev_device = udev_device_new_from_devnum(udev_context, 'b', dev->dev))) { log_warn("WARNING: Failed to get udev device handler for device %s.", dev_name(dev)); - return 0; + return NULL; } #ifdef HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED @@ -1042,19 +1040,32 @@ int udev_dev_is_mpath_component(struct device *dev) #endif log_debug("Device %s not initialized in udev database (%u/%u, %u microseconds).", dev_name(dev), - i + 1, UDEV_DEV_IS_MPATH_COMPONENT_ITERATION_COUNT, - i * UDEV_DEV_IS_MPATH_COMPONENT_USLEEP); + i + 1, UDEV_DEV_IS_COMPONENT_ITERATION_COUNT, + i * UDEV_DEV_IS_COMPONENT_USLEEP); - usleep(UDEV_DEV_IS_MPATH_COMPONENT_USLEEP); + usleep(UDEV_DEV_IS_COMPONENT_USLEEP); i++; } if (!initialized) { log_warn("WARNING: Device %s not initialized in udev database even after waiting %u microseconds.", - dev_name(dev), i * UDEV_DEV_IS_MPATH_COMPONENT_USLEEP); + dev_name(dev), i * UDEV_DEV_IS_COMPONENT_USLEEP); goto out; } +out: + return udev_device; +} + +int udev_dev_is_mpath_component(struct device *dev) +{ + struct udev_device *udev_device; + const char *value; + int ret = 0; + + if (!(udev_device = _udev_get_dev(dev))) + return 0; + value = udev_device_get_property_value(udev_device, DEV_EXT_UDEV_BLKID_TYPE); if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_MPATH)) { log_debug("Device %s is multipath component based on blkid variable in udev db (%s=\"%s\").", @@ -1074,6 +1085,28 @@ out: udev_device_unref(udev_device); return ret; } + +int udev_dev_is_md_component(struct device *dev) +{ + struct udev_device *udev_device; + const char *value; + int ret = 0; + + if (!(udev_device = _udev_get_dev(dev))) + return 0; + + value = udev_device_get_property_value(udev_device, DEV_EXT_UDEV_BLKID_TYPE); + if (value && !strcmp(value, DEV_EXT_UDEV_BLKID_TYPE_SW_RAID)) { + log_debug("Device %s is md raid component based on blkid variable in udev db (%s=\"%s\").", + dev_name(dev), DEV_EXT_UDEV_BLKID_TYPE, value); + ret = 1; + goto out; + } +out: + udev_device_unref(udev_device); + return ret; +} + #else int udev_dev_is_mpath_component(struct device *dev) @@ -1081,4 +1114,9 @@ int udev_dev_is_mpath_component(struct device *dev) return 0; } +int udev_dev_is_md_component(struct device *dev) +{ + return 0; +} + #endif diff --git a/lib/device/dev-type.h b/lib/device/dev-type.h index f629a0278..264438339 100644 --- a/lib/device/dev-type.h +++ b/lib/device/dev-type.h @@ -62,6 +62,7 @@ int dev_is_swap(struct device *dev, uint64_t *signature, int full); int dev_is_luks(struct device *dev, uint64_t *signature, int full); int dasd_is_cdl_formatted(struct device *dev); int udev_dev_is_mpath_component(struct device *dev); +int udev_dev_is_md_component(struct device *dev); int dev_is_lvm1(struct device *dev, char *buf, int buflen); int dev_is_pool(struct device *dev, char *buf, int buflen); diff --git a/lib/label/label.c b/lib/label/label.c index b26ff3370..e01608d2c 100644 --- a/lib/label/label.c +++ b/lib/label/label.c @@ -957,6 +957,12 @@ int label_scan_pvscan_all(struct cmd_context *cmd, struct dm_list *scan_devs) bcache_invalidate_fd(scan_bcache, dev->bcache_fd); _scan_dev_close(dev); } + + if (dev_is_md_with_end_superblock(cmd->dev_types, dev)) { + cmd->use_full_md_check = 1; + use_full_md_check = 1; + log_debug("Found md component in sysfs with end superblock %s", dev_name(dev)); + } }; dev_iter_destroy(iter); diff --git a/tools/pvscan.c b/tools/pvscan.c index 3755684d2..877b6b2db 100644 --- a/tools/pvscan.c +++ b/tools/pvscan.c @@ -455,7 +455,8 @@ static int _pvscan_cache(struct cmd_context *cmd, int argc, char **argv) if (dev_is_md_with_end_superblock(cmd->dev_types, dev)) { cmd->use_full_md_check = 1; use_full_md_check = 1; - log_debug("Found md with end superblock %s", dev_name(dev)); + log_debug("Found md component in sysfs with end superblock %s", dev_name(dev)); + break; } } dev_iter_destroy(iter); -- 2.12.3
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