Now, every Unmount() call takes a burden to parse the whole nine yards
of /proc/self/mountinfo to figure out whether the given mount point is
mounted or not (and returns an error in case parsing fails somehow).
Instead, let's just call umount() and ignore EINVAL, which results
in the same behavior, but much better performance.
Note that EINVAL is returned from umount(2) not only in the case when
`target` is not mounted, but also for invalid flags. As the flags are
hardcoded here, it can't be the case.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: a1d095199ddb9b4811e1417b6adcdfadad7d73f4
Component: engine
The mountinfo parser implemented via `fmt.Sscanf()` is slower than the one
using `strings.Split()` and `strconv.Atoi()`. This rewrite helps to speed it
up to a factor of 8x, here is a result from go bench:
> BenchmarkParsingScanf-4 300 22294112 ns/op
> BenchmarkParsingSplit-4 3000 2780703 ns/op
I tried other approaches, such as using `fmt.Sscanf()` for the first
three (integer) fields and `strings.Split()` for the rest, but it slows
things down considerably:
> BenchmarkParsingMixed-4 1000 8827058 ns/op
Note the old code uses `fmt.Sscanf`, when a linear search for '-' field,
when a split for the last 3 fields. The new code relies on a single
split.
I have also added more comments to aid in future development.
Finally, the test data is fixed to now have white space before the first field.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: c611f18a7f16d8aa878a5a5c7537d23a0937c40a
Component: engine
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
Functions `GetMounts()` and `parseMountTable()` return all the entries
as read and parsed from /proc/self/mountinfo. In many cases the caller
is only interested only one or a few entries, not all of them.
One good example is `Mounted()` function, which looks for a specific
entry only. Another example is `RecursiveUnmount()` which is only
interested in mount under a specific path.
This commit adds `filter` argument to `GetMounts()` to implement
two things:
1. filter out entries a caller is not interested in
2. stop processing if a caller is found what it wanted
`nil` can be passed to get a backward-compatible behavior, i.e. return
all the entries.
A few filters are implemented:
- `PrefixFilter`: filters out all entries not under `prefix`
- `SingleEntryFilter`: looks for a specific entry
Finally, `Mounted()` is modified to use `SingleEntryFilter()`, and
`RecursiveUnmount()` is using `PrefixFilter()`.
Unit tests are added to check filters are working.
[v2: ditch NoFilter, use nil]
[v3: ditch GetMountsFiltered()]
[v4: add unit test for filters]
[v5: switch to gotestyourself]
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: bb934c6aca3e77541dd4fd51b9ab2706294dadda
Component: engine
Sorting by mount point length can be implemented in a more
straightforward fashion since Go 1.8 introduced sort.Slice()
with an ability to provide a less() function in place.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: a00310b54c0cdcafb402aeea92feca865da9fdf3
Component: engine
This makes `go test .` to pass if run as non-root user, skipping
those tests that require superuser privileges (for `mount`).
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 4aae77602a7540b4f977572f3fbdc0891ac57cab
Component: engine
When a recursive unmount fails, don't bother parsing the mount table to check
if what we expected to be a mountpoint is still mounted. `EINVAL` is
returned when you try to unmount something that is not a mountpoint, the
other cases of `EINVAL` would not apply here unless everything is just
wrong. Parsing the mount table over and over is relatively expensive,
especially in the code path that it's in.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: dd2108766017c13a19bdbfd1a56cd1358580e0bb
Component: engine
Files that are suffixed with `_linux.go` or `_windows.go` are
already only built on Linux / Windows, so these build-tags
were redundant.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 6ed1163c98703f8dd0693cecbadc84d2cda811c3
Component: engine
For obvious reasons that it is not really supported now.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Upstream-commit: 5a9b5f10cf967f31f0856871ad08f9a0286b4a46
Component: engine
Make sure to call C.free on C string allocated using C.CString in every
exit path.
C.CString allocates memory in the C heap using malloc. It is the callers
responsibility to free them. See
https://golang.org/cmd/cgo/#hdr-Go_references_to_C for details.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Upstream-commit: 593dbfd1448e8dac08488786fde6fe7fb057bdac
Component: engine
The case where we are trying to do a remount with changed filesystem specific options was missing,
we need to call `mount` as well here to change those options.
See #33844 for where we need this, as we change `tmpfs` options.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
Upstream-commit: 3a1ab5b479ce843648cf676fbaaf2bec9e040dce
Component: engine
Changes most references of syscall to golang.org/x/sys/
Ones aren't changes include, Errno, Signal and SysProcAttr
as they haven't been implemented in /x/sys/.
Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>
[s390x] switch utsname from unsigned to signed
per 33267e036f
char in s390x in the /x/sys/unix package is now signed, so
change the buildtags
Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>
Upstream-commit: 069fdc8a083cb1663e4f86fe3fd9b9a1aebc3e54
Component: engine
Before this, if `forceRemove` is set the container data will be removed
no matter what, including if there are issues with removing container
on-disk state (rw layer, container root).
In practice this causes a lot of issues with leaked data sitting on
disk that users are not able to clean up themselves.
This is particularly a problem while the `EBUSY` errors on remove are so
prevalent. So for now let's not keep this behavior.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: 54dcbab25ea4771da303fa95e0c26f2d39487b49
Component: engine
This fixes issues where the underlying filesystem may be disconnected and
attempting to unmount may cause a hang.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: acbfe6bc56b9357d40a452f6b3901cb2c2d40404
Component: engine
Propagation type changes must be done as a separate call, in the
same way as read only bind mounts.
To fix this:
1. Ensure propagation type change flags aren't included in other calls.
2. Apply propagation type change in a separate call.
Also:
* Make it clear which parameters are ignored by passing them as empty.
* Add tests to ensure Mount options are applied correctly.
Fixes#30415
Signed-off-by: Steven Hartland <steven.hartland@multiplay.co.uk>
Upstream-commit: b3b14b97b1087bfbce6a4de7039e17847fe491a2
Component: engine
This fix tries to address the issue raised in #22420. When
`--tmpfs` is specified with `/tmp`, the default value is
`rw,nosuid,nodev,noexec,relatime,size=65536k`. When `--tmpfs`
is specified with `/tmp:rw`, then the value changed to
`rw,nosuid,nodev,noexec,relatime`.
The reason for such an inconsistency is because docker tries
to add `size=65536k` option only when user provides no option.
This fix tries to address this issue by always pre-progating
`size=65536k` along with `rw,nosuid,nodev,noexec,relatime`.
If user provides a different value (e.g., `size=8192k`), it
will override the `size=65536k` anyway since the combined
options will be parsed and merged to remove any duplicates.
Additional test cases have been added to cover the changes
in this fix.
This fix fixes#22420.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 397a6fefadf9ac91a5c9de2447f4dea607296470
Component: engine
dockerinit has been around for a very long time. It was originally used
as a way for us to do configuration for LXC containers once the
container had started. LXC is no longer supported, and /.dockerinit has
been dead code for quite a while. This removes all code and references
in code to dockerinit.
Signed-off-by: Aleksa Sarai <asarai@suse.com>
Upstream-commit: 4357ed4a7363a1032edf93cf03232953c805184f
Component: engine
If you run a
docker run command with --tmpfs /mountpoint:noexec
Or certain options that get translated into mount options, the mount command can get passed "" for mount data.
So this should be valid.
Signed-off-by: Dan Walsh <dwalsh@redhat.com>
Upstream-commit: 89a775d2dc596b9ac86873edf447fff2f7012ef3
Component: engine
It will Tar up contents of child directory onto tmpfs if mounted over
This patch will use the new PreMount and PostMount hooks to "tar"
up the contents of the base image on top of tmpfs mount points.
Signed-off-by: Dan Walsh <dwalsh@redhat.com>
Upstream-commit: b3e527dfd242ad30c0297c8b257862116cf2c50e
Component: engine
Fix the following warnings:
pkg/mount/mountinfo.go:5:6: type name will be used as mount.MountInfo by other packages, and that stutters; consider calling this Info
pkg/mount/mountinfo.go:7:2: struct field Id should be ID
Signed-off-by: Antonio Murdaca <runcom@linux.com>
Upstream-commit: 0f5c9d301b9b1cca66b3ea0f9dec3b5317d3686d
Component: engine
one linux, the optional field designates the sharedsubtree information,
if any.
Signed-off-by: Vincent Batts <vbatts@redhat.com>
Upstream-commit: 91b4ac320fd91a6b776713b3c35a51da96024b32
Component: engine
The logic is unrelated to graphdriver.
Signed-off-by: Vincent Batts <vbatts@redhat.com>
Upstream-commit: 930a756ad55ad5f4e5e6391b41673743d7254c2b
Component: engine
This prevents the testing package flags from leaking into the flagsets
of binaries that import docker. I left integration-cli alone.
Docker-DCO-1.1-Signed-off-by: Peter Bourgon <peter@bourgon.org> (github: peterbourgon)
Upstream-commit: b87daf6d697655ca092bf54717a64b07504a13c1
Component: engine
