fork of 9front i guess
55c3138c64
The Mhead structures have two sources of references to them: - from Pgrp.mnthash hash-table - from a channels Chan.umh pointer as returned by namec() for a union directory Unless one holds the Mhead.lock RWLock, the Mhead.mount chain can be mutated by eigther cmount(), cunmount() or closepgrp(). Readers, skipping acquiering the lock where: mountfix(): responsible for rewriting directory entries for union directory reads; was walking the Mhead.mount chain to detect if the passed channel itself appears in the mount list. cmount(): had a check and copy when "new" chan was a union itself and if the MCREATE flag is set and would copy the mount table. All this needs to be done with Mhead read-locked while copying the mount entries. devproc(): in the handler for reading /proc/n/ns file. namec(): while checking if the Chan->umh should be initialized. In addition to this, cmount() is changed to do the mountfree() of the original mount chain when MREPL is done after releasing the locks. Also, some cosmetic changes... |
||
|---|---|---|
| 386 | ||
| 68000 | ||
| 68020 | ||
| acme | ||
| adm/timezone | ||
| amd64 | ||
| arm | ||
| arm64 | ||
| lib | ||
| mips | ||
| power | ||
| power64 | ||
| rc | ||
| sparc | ||
| sparc64 | ||
| spim | ||
| sys | ||