Messages in this thread | | | From | Andreas Gruenbacher <> | Subject | Re: [d_path 0/7] Fixes to d_path: Respin | Date | Fri, 20 Apr 2007 13:45:09 +0200 |
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On Friday 20 April 2007 11:30, Alan Cox wrote: > > As far as I can see, glibc internally looks at /proc/mounts (or else > > mtab) to find out where tmpfs is mounted for opening files there, and to > > look up filesystem information for statfs(), while accessing that path, > > too. Fstatfs() also looks into the same files, but it only matches by > > filesystem type, so this is only a very unreliable heuristic, anyway. > > > > So judging from that, glibc users should be fine. > > So glibc does use it and you will change behaviour
Not for statfs(), shm_open(), and sem_open().
Possibly for fstatfs(): fstatfs() has no way of looking up mount points per path name in /proc/mounts, and so it resorts to mapping from the numeric statfs->f_type to the filesystem name (e.g., "ext3"), looks up the first mount point with that name, and sets the statfs->f_flag flags based on that entry. This field may change from one arbitrary value to another.
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