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autofs: update ioctl documentation regarding struct autofs_dev_ioctl
This is the same asbf72eda5
except that it's a different file. Sync documentation with changes made by730c9eec
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>
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@ -179,6 +179,7 @@ struct autofs_dev_ioctl {
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* including this struct */
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__s32 ioctlfd; /* automount command fd */
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/* Command parameters */
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union {
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struct args_protover protover;
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struct args_protosubver protosubver;
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@ -425,8 +425,20 @@ Each ioctl is passed a pointer to an `autofs_dev_ioctl` structure:
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* including this struct */
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__s32 ioctlfd; /* automount command fd */
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__u32 arg1; /* Command parameters */
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__u32 arg2;
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/* Command parameters */
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union {
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struct args_protover protover;
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struct args_protosubver protosubver;
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struct args_openmount openmount;
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struct args_ready ready;
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struct args_fail fail;
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struct args_setpipefd setpipefd;
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struct args_timeout timeout;
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struct args_requester requester;
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struct args_expire expire;
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struct args_askumount askumount;
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struct args_ismountpoint ismountpoint;
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};
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char path[0];
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};
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@ -446,24 +458,22 @@ Commands are:
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set version numbers.
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- **AUTOFS_DEV_IOCTL_OPENMOUNT_CMD**: return an open file descriptor
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on the root of an autofs filesystem. The filesystem is identified
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by name and device number, which is stored in `arg1`. Device
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numbers for existing filesystems can be found in
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by name and device number, which is stored in `openmount.devid`.
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Device numbers for existing filesystems can be found in
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`/proc/self/mountinfo`.
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- **AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD**: same as `close(ioctlfd)`.
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- **AUTOFS_DEV_IOCTL_SETPIPEFD_CMD**: if the filesystem is in
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catatonic mode, this can provide the write end of a new pipe
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in `arg1` to re-establish communication with a daemon. The
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process group of the calling process is used to identify the
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in `setpipefd.pipefd` to re-establish communication with a daemon.
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The process group of the calling process is used to identify the
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daemon.
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- **AUTOFS_DEV_IOCTL_REQUESTER_CMD**: `path` should be a
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name within the filesystem that has been auto-mounted on.
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On successful return, `arg1` and `arg2` will be the UID and GID
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of the process which triggered that mount.
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On successful return, `requester.uid` and `requester.gid` will be
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the UID and GID of the process which triggered that mount.
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- **AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD**: Check if path is a
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mountpoint of a particular type - see separate documentation for
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details.
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- **AUTOFS_DEV_IOCTL_PROTOVER_CMD**:
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- **AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD**:
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- **AUTOFS_DEV_IOCTL_READY_CMD**:
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@ -473,7 +483,7 @@ Commands are:
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- **AUTOFS_DEV_IOCTL_EXPIRE_CMD**:
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- **AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD**: These all have the same
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function as the similarly named **AUTOFS_IOC** ioctls, except
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that **FAIL** can be given an explicit error number in `arg1`
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that **FAIL** can be given an explicit error number in `fail.status`
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instead of assuming `ENOENT`, and this **EXPIRE** command
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corresponds to **AUTOFS_IOC_EXPIRE_MULTI**.
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