Skip to content

Commit 4f38d2d

Browse files
tianontianon
authored
Merge pull request #1181 from AkihiroSuda/clarify-mount-options
config: clarify Linux mount options
2 parents 3eb0620 + 6c638b1 commit 4f38d2d

File tree

1 file changed

+79
-2
lines changed

1 file changed

+79
-2
lines changed

‎config.md

Lines changed: 79 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -77,11 +77,87 @@ For Solaris, the mount entry corresponds to the 'fs' resource in the [zonecfg(1M
7777
* Windows: a local directory on the filesystem of the container host. UNC paths and mapped drives are not supported.
7878
* Solaris: corresponds to "special" of the fs resource in [zonecfg(1M)][zonecfg.1m].
7979
* **`options`** (array of strings, OPTIONAL) Mount options of the filesystem to be used.
80-
* Linux: supported options are listed in the [mount(8)][mount.8] man page.
81-
Note both [filesystem-independent][mount.8-filesystem-independent] and [filesystem-specific][mount.8-filesystem-specific] options are listed.
80+
* Linux: See [Linux mount options](#configLinuxMountOptions) below.
8281
* Solaris: corresponds to "options" of the fs resource in [zonecfg(1M)][zonecfg.1m].
8382
* Windows: runtimes MUST support `ro`, mounting the filesystem read-only when `ro` is given.
8483

84+
### <a name="configLinuxMountOptions" />Linux mount options
85+
86+
Runtimes MUST/SHOULD/MAY implement the following option strings for Linux:
87+
88+
Option name | Requirement | Description
89+
------------------|-------------|-----------------------------------------------------
90+
`async` | MUST | [^1]
91+
`atime` | MUST | [^1]
92+
`bind` | MUST | [^2] (bind mounts)
93+
`defaults` | MUST | [^1]
94+
`dev` | MUST | [^1]
95+
`diratime` | MUST | [^1]
96+
`dirsync` | MUST | [^1]
97+
`exec` | MUST | [^1]
98+
`iversion` | MUST | [^1]
99+
`lazytime` | MUST | [^1]
100+
`loud` | MUST | [^1]
101+
`mand` | MAY | [^1] (Deprecated in kernel 5.15, util-linux 2.38)
102+
`noatime` | MUST | [^1]
103+
`nodev` | MUST | [^1]
104+
`nodiratime` | MUST | [^1]
105+
`noexec` | MUST | [^1]
106+
`noiversion` | MUST | [^1]
107+
`nolazytime` | MUST | [^1]
108+
`nomand` | MAY | [^1]
109+
`norelatime` | MUST | [^1]
110+
`nostrictatime` | MUST | [^1]
111+
`nosuid` | MUST | [^1]
112+
`nosymfollow` | SHOULD | [^1] (Introduced in kernel 5.10, util-linux 2.38)
113+
`private` | MUST | [^2] (bind mounts)
114+
`ratime` | SHOULD | Recursive `atime` [^3]
115+
`rbind` | MUST | [^2] (bind mounts)
116+
`rdev` | SHOULD | Recursive `dev` [^3]
117+
`rdiratime` | SHOULD | Recursive `diratime` [^3]
118+
`relatime` | MUST | [^1]
119+
`remount` | MUST | [^1]
120+
`rexec` | SHOULD | Recursive `dev` [^3]
121+
`rnoatime` | SHOULD | Recursive `noatime` [^3]
122+
`rnodiratime` | SHOULD | Recursive `nodiratime` [^3]
123+
`rnoexec` | SHOULD | Recursive `noexec` [^3]
124+
`rnorelatime` | SHOULD | Recursive `norelatime` [^3]
125+
`rnostrictatime` | SHOULD | Recursive `nostrictatime` [^3]
126+
`rnosuid` | SHOULD | Recursive `nosuid` [^3]
127+
`rnosymfollow` | SHOULD | Recursive `nosymfollow` [^3]
128+
`ro` | MUST | [^1]
129+
`rprivate` | MUST | [^2] (bind mounts)
130+
`rrelatime ` | SHOULD | Recursive `relatime` [^3]
131+
`rro` | SHOULD | Recursive `ro` [^3]
132+
`rrw` | SHOULD | Recursive `rw` [^3]
133+
`rshared` | MUST | [^2] (bind mounts)
134+
`rslave` | MUST | [^2] (bind mounts)
135+
`rstrictatime` | SHOULD | Recursive `strictatime` [^3]
136+
`rsuid` | SHOULD | Recursive `suid` [^3]
137+
`rsymfollow` | SHOULD | Recursive `symfollow` [^3]
138+
`runbindable` | MUST | [^2] (bind mounts)
139+
`rw` | MUST | [^1]
140+
`shared` | MUST | [^1]
141+
`silent` | MUST | [^1]
142+
`slave` | MUST | [^2] (bind mounts)
143+
`strictatime` | MUST | [^1]
144+
`suid` | MUST | [^1]
145+
`symfollow` | SHOULD | Opposite of `nosymfollow`
146+
`sync` | MUST | [^1]
147+
`tmpcopyup` | MAY | copy up the contents to a tmpfs
148+
`unbindable` | MUST | [^2] (bind mounts)
149+
150+
[^1]: Corresponds to [`mount(8)` (filesystem-independent)][mount.8-filesystem-independent].
151+
[^2]: Corresponds to [`mount(8)` (filesystem-specific)][mount.8-filesystem-specific].
152+
[^3]: These `AT_RECURSIVE` options need kernel 5.12 or later. See [`mount_setattr(2)`][mount_setattr.2]
153+
154+
The "MUST" options correspond to [`mount(8)`][mount.8].
155+
156+
Runtimes MAY also implement custom option strings that are not listed in the table above.
157+
If a custom option string is already recognized by [`mount(8)`][mount.8], the runtime SHOULD follow the behavior of [`mount(8)`][mount.8].
158+
159+
Runtimes SHOULD pass unknown options to [`mount(2)`][mount.2] via the fifth argument (`const void *data`).
160+
85161
### Example (Windows)
86162

87163
```json
@@ -1004,6 +1080,7 @@ Here is a full example `config.json` for reference.
10041080
[mount.8]: http://man7.org/linux/man-pages/man8/mount.8.html
10051081
[mount.8-filesystem-independent]: http://man7.org/linux/man-pages/man8/mount.8.html#FILESYSTEM-INDEPENDENT_MOUNT_OPTIONS
10061082
[mount.8-filesystem-specific]: http://man7.org/linux/man-pages/man8/mount.8.html#FILESYSTEM-SPECIFIC_MOUNT_OPTIONS
1083+
[mount_setattr.2]: http://man7.org/linux/man-pages/man2/mount_setattr.2.html
10071084
[getrlimit.2]: http://man7.org/linux/man-pages/man2/getrlimit.2.html
10081085
[getrlimit.3]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/getrlimit.html
10091086
[stdin.3]: http://man7.org/linux/man-pages/man3/stdin.3.html

0 commit comments

Comments
 (0)