restructure

technology/linux/systemd/Systemd-Mounts.md

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+---
+obj: concept
+---
+
+Mounts are _systemd_ unit files with a suffix of _.mount_. A unit configuration file whose name ends in ".mount" encodes information about a file system mount point controlled and supervised by systemd.
+
+Mount Unit files like every unit file include the `[Unit]` and `[Install]` sections. Additionally all mount information is in the `[Mount]` section.
+
+## Mount Section
+Fields inside the mount section:
+- `What` : Takes an absolute path of a device node, file or other resource to mount
+- `Where` : Takes an absolute path of a file or directory for the mount point; in particular, the destination cannot be a symbolic link. If the mount point does not exist at the time of mounting, it is created as either a directory or a file. The former is the usual case; the latter is done only if this mount is a bind mount and the source (What=) is not a directory. This string must be reflected in the unit filename (example: `mountpoint=/home/me` -> `unit file: home-me.mount`).
+- `Type` : Takes a string for the file system type. This setting is optional.
+- `Options` : Mount options to use when mounting. This takes a comma-separated list of options. This setting is optional.
+
+## Example
+```
+[Unit]
+Documentation=man:fstab(5) man:systemd-fstab-generator(8)
+SourcePath=/etc/fstab
+
+[Mount]
+What=/dev/sda1
+Where=/mnt
+Type=btrfs
+Options=nosuid,nodev,nofail,compress=zstd,ro
+```