Files
docker-cli/components/engine/daemon
Kir Kolyshkin cd146e5f0d getSourceMount(): simplify
The flow of getSourceMount was:
 1 get all entries from /proc/self/mountinfo
 2 do a linear search for the `source` directory
 3 if found, return its data
 4 get the parent directory of `source`, goto 2

The repeated linear search through the whole mountinfo (which can have
thousands of records) is inefficient. Instead, let's just

 1 collect all the relevant records (only those mount points
   that can be a parent of `source`)
 2 find the record with the longest mountpath, return its data

This was tested manually with something like

```go
func TestGetSourceMount(t *testing.T) {
	mnt, flags, err := getSourceMount("/sys/devices/msr/")
	assert.NoError(t, err)
	t.Logf("mnt: %v, flags: %v", mnt, flags)
}
```

...but it relies on having a specific mount points on the system
being used for testing.

[v2: add unit tests for ParentsFilter]

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 871c957242df9f8c74faf751a2f14eb5178d4140
Component: engine
2018-04-19 14:49:17 -07:00
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