Official MINIX sources - Automatically replicated from gerrit.minix3.org
3835235193
Previously, VFS would reopen a character device after a driver crash if the associated file descriptor was opened with the O_REOPEN flag. This patch removes support for this feature. The code was complex, full of uncovered corner cases, and hard to test. Moreover, it did not actually hide the crash from user applications: they would get an error code to indicate that something went wrong, and have to decide based on the nature of the underlying device how to continue. - remove support for O_REOPEN, and make playwave(1) reopen its device; - remove support for the DEV_REOPEN protocol message; - remove all code in VFS related to reopening character devices; - no longer change VFS filp reference count and FD bitmap upon filp invalidation; instead, make get_filp* fail all calls on invalidated FDs except when obtained with the locktype VNODE_OPCL which is used by close_fd only; - remove the VFS fproc file descriptor bitmap entirely, returning to the situation that a FD is in use if its slot points to a filp; use FILP_CLOSED as single means of marking a filp as invalidated. Change-Id: I34f6bc69a036b3a8fc667c1f80435ff3af56558f |
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