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As we start refactoring the code to break dependencies (see doc/refactoring.txt),
I want us to use full paths in the includes (eg, #include "base/data-struct/list.h").
This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in
metadata/ from base/
There are detailed messages inside _create_dir_recursive that
dm_create_dir calls (except EROFS which where the message is not
generated, like anywhere else in the code).
Also make error messages more consistent:
Before this patch:
(/run/lock exists and is not a directory)
$ pvs
/run/lock/lvm: mkdir failed: Not a directory
File-based locking initialisation failed.
(/run/lock/lvm exists and is not a directory)
$ pvs
Directory "/run/lock/lvm" not found
File-based locking initialisation failed.
With this patch applied:
(/run/lock exists and is not a directory)
$ pvs
Existing path /run/lock is not a directory.
Failed to create directory /run/lock/lvm.
File-based locking initialisation failed
(/run/lock/lvm exists and is not a directory)
$ pvs
Existing path /run/lock/lvm is not a directory.
Failed to create directory /run/lock/lvm.
File-based locking initialisation failed.
Add dm_device_has_mounted_fs fn to check mounted filesystem on a device.
This requires sysfs directory to be correctly set via dm_set_sysfs_dir
(/sys by default). If sysfs dir is not used or it's set incorrectly,
dm_device_has_{holders,mounted_fs} will return 0!
mirrors, we must also check that the log daemon (cmirrord) is running.
The log module can be auto-loaded, but the daemon cannot be
"auto-started". Failing to check for the daemon produces cryptic
messages that customers have a hard time deciphering. (The system
messages do report that the log daemon is not running, but people
don't seem to find this message easily.)
Here are examples of what is printed when the module is available,
but the log daemon has not been started.
[root@bp-01 LVM2]# lvcreate -m1 -l1 -n lv vg
Shared cluster mirrors are not available.
[root@bp-01 LVM2]# lvcreate -m1 -l1 -n lv vg -v
Setting logging type to disk
Finding volume group "vg"
Archiving volume group "vg" metadata (seqno 3).
Creating logical volume lv
Executing: /sbin/modprobe dm-log-userspace
Cluster mirror log daemon is not running
Shared cluster mirrors are not available.
Creating volume group backup "/etc/lvm/backup/vg" (seqno 4).
Switch dmeventd to use dm_create_lockfile and drop duplicate code.
Allow clvmd pidfile to be configurable.
Switch cmirrord and clvmd to use dm_create_lockfile.
