On 08/10/2017 05:25 AM, NeilBrown wrote: > > - fstatfs is now permitted. > - ioctl isn't, and is worth listing explicitly > - O_PATH allows an automount point to be opened with > triggering the mount. > > All tested Thanks, Neil. Patch applied. Cheers, Michael > Signed-off-by: NeilBrown <neilb@xxxxxxxx> > --- > man2/open.2 | 16 +++++++++++++++- > 1 file changed, 15 insertions(+), 1 deletion(-) > > diff --git a/man2/open.2 b/man2/open.2 > index e3b00939790c..38d532397b02 100644 > --- a/man2/open.2 > +++ b/man2/open.2 > @@ -585,6 +585,7 @@ The file itself is not opened, and other file operations (e.g., > .BR fchmod (2), > .BR fchown (2), > .BR fgetxattr (2), > +.BR ioctl (2), > .BR mmap (2)) > fail with the error > .BR EBADF . > @@ -599,8 +600,11 @@ be performed on the resulting file descriptor: > (since Linux 3.5); > .\" commit 332a2e1244bd08b9e3ecd378028513396a004a24 > .BR fstat (2) > -(since Linux 3.6). > +(since Linux 3.6); > .\" fstat(): commit 55815f70147dcfa3ead5738fd56d3574e2e3c1c2 > +.BR fstatfs (2) > +(since Linux 3.12). > +.\" fstatfs(): commit 9d05746e7b16d8565dddbe3200faa1e669d23bbf > .IP * > Duplicating the file descriptor > .RB ( dup (2), > @@ -666,6 +670,16 @@ argument in calls to > and > .BR readlinkat (2) > with an empty pathname to have the calls operate on the symbolic link. > + > +If > +.I pathname > +refers to an automount point that has not yet been triggered, so no > +other filesystem is mounted on it, then the call returns a file > +descriptor referring to the automount directory without triggering a mount. > +.BR fstatfs (2) > +can then be used to determine if it is, in fact, an untriggered > +automount point > +.RB ( ".f_type == AUTOFS_SUPER_MAGIC" ). > .TP > .B O_SYNC > Write operations on the file will complete according to the requirements of > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
