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| author | Tomohiro Kusumi <tkusumi@tuxera.com> | 2017-02-27 23:27:08 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-28 03:43:45 +0100 |
| commit | 88488080946c2da0d998a3ac0a0a5aebf8dc62c8 (patch) | |
| tree | 964271dadc5d7aa34db80ae54bf7e9d7782f3370 /Documentation/filesystems/autofs4.txt | |
| parent | autofs: fix wrong ioctl documentation regarding devid (diff) | |
| download | linux-88488080946c2da0d998a3ac0a0a5aebf8dc62c8.tar.xz linux-88488080946c2da0d998a3ac0a0a5aebf8dc62c8.zip | |
autofs: update ioctl documentation regarding struct autofs_dev_ioctl
This is the same as bf72eda5 except that it's a different file. Sync
documentation with changes made by 730c9eec in 2009.
Link: http://lkml.kernel.org/r/148577165630.9801.6081791213151121657.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/filesystems/autofs4.txt')
| -rw-r--r-- | Documentation/filesystems/autofs4.txt | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/Documentation/filesystems/autofs4.txt b/Documentation/filesystems/autofs4.txt index 75348631a3d8..f10dd590f69f 100644 --- a/Documentation/filesystems/autofs4.txt +++ b/Documentation/filesystems/autofs4.txt @@ -425,8 +425,20 @@ Each ioctl is passed a pointer to an `autofs_dev_ioctl` structure: * including this struct */ __s32 ioctlfd; /* automount command fd */ - __u32 arg1; /* Command parameters */ - __u32 arg2; + /* Command parameters */ + union { + struct args_protover protover; + struct args_protosubver protosubver; + struct args_openmount openmount; + struct args_ready ready; + struct args_fail fail; + struct args_setpipefd setpipefd; + struct args_timeout timeout; + struct args_requester requester; + struct args_expire expire; + struct args_askumount askumount; + struct args_ismountpoint ismountpoint; + }; char path[0]; }; @@ -446,24 +458,22 @@ Commands are: set version numbers. - **AUTOFS_DEV_IOCTL_OPENMOUNT_CMD**: return an open file descriptor on the root of an autofs filesystem. The filesystem is identified - by name and device number, which is stored in `arg1`. Device - numbers for existing filesystems can be found in + by name and device number, which is stored in `openmount.devid`. + Device numbers for existing filesystems can be found in `/proc/self/mountinfo`. - **AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD**: same as `close(ioctlfd)`. - **AUTOFS_DEV_IOCTL_SETPIPEFD_CMD**: if the filesystem is in catatonic mode, this can provide the write end of a new pipe - in `arg1` to re-establish communication with a daemon. The - process group of the calling process is used to identify the + in `setpipefd.pipefd` to re-establish communication with a daemon. + The process group of the calling process is used to identify the daemon. - **AUTOFS_DEV_IOCTL_REQUESTER_CMD**: `path` should be a name within the filesystem that has been auto-mounted on. - On successful return, `arg1` and `arg2` will be the UID and GID - of the process which triggered that mount. - + On successful return, `requester.uid` and `requester.gid` will be + the UID and GID of the process which triggered that mount. - **AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD**: Check if path is a mountpoint of a particular type - see separate documentation for details. - - **AUTOFS_DEV_IOCTL_PROTOVER_CMD**: - **AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD**: - **AUTOFS_DEV_IOCTL_READY_CMD**: @@ -473,7 +483,7 @@ Commands are: - **AUTOFS_DEV_IOCTL_EXPIRE_CMD**: - **AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD**: These all have the same function as the similarly named **AUTOFS_IOC** ioctls, except - that **FAIL** can be given an explicit error number in `arg1` + that **FAIL** can be given an explicit error number in `fail.status` instead of assuming `ENOENT`, and this **EXPIRE** command corresponds to **AUTOFS_IOC_EXPIRE_MULTI**. |