87337273e4
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
75 lines
2.9 KiB
C
75 lines
2.9 KiB
C
#ifndef __VFS_FPROC_H__
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#define __VFS_FPROC_H__
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#include "threads.h"
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#include <sys/select.h>
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#include <minix/safecopies.h>
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/* This is the per-process information. A slot is reserved for each potential
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* process. Thus NR_PROCS must be the same as in the kernel. It is not
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* possible or even necessary to tell when a slot is free here.
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*/
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#define LOCK_DEBUG 0
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EXTERN struct fproc {
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unsigned fp_flags;
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pid_t fp_pid; /* process id */
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endpoint_t fp_endpoint; /* kernel endpoint number of this process */
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struct vnode *fp_wd; /* working directory; NULL during reboot */
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struct vnode *fp_rd; /* root directory; NULL during reboot */
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struct filp *fp_filp[OPEN_MAX];/* the file descriptor table (free if NULL) */
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fd_set fp_cloexec_set; /* bit map for POSIX Table 6-2 FD_CLOEXEC */
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dev_t fp_tty; /* major/minor of controlling tty */
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int fp_blocked_on; /* what is it blocked on */
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int fp_block_callnr; /* blocked call if rd/wr can't finish */
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int fp_cum_io_partial; /* partial byte count if rd/wr can't finish */
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endpoint_t fp_task; /* which task is proc suspended on */
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endpoint_t fp_ioproc; /* proc no. in suspended-on i/o message */
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cp_grant_id_t fp_grant; /* revoke this grant on unsuspend if > -1 */
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uid_t fp_realuid; /* real user id */
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uid_t fp_effuid; /* effective user id */
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gid_t fp_realgid; /* real group id */
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gid_t fp_effgid; /* effective group id */
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int fp_ngroups; /* number of supplemental groups */
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gid_t fp_sgroups[NGROUPS_MAX];/* supplemental groups */
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mode_t fp_umask; /* mask set by umask system call */
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mutex_t fp_lock; /* mutex to lock fproc object */
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struct worker_thread *fp_worker;/* active worker thread, or NULL */
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void (*fp_func)(); /* handler function for pending work */
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message fp_msg; /* pending or active message from process */
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message fp_pm_msg; /* pending/active postponed PM request */
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char fp_name[PROC_NAME_LEN]; /* Last exec() */
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#if LOCK_DEBUG
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int fp_vp_rdlocks; /* number of read-only locks on vnodes */
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int fp_vmnt_rdlocks; /* number of read-only locks on vmnts */
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#endif
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vir_bytes text_size; /* text segment size of current process */
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vir_bytes data_size; /* data segment size of current process */
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} fproc[NR_PROCS];
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/* fp_flags */
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#define FP_NOFLAGS 0000
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#define FP_SRV_PROC 0001 /* Set if process is a service */
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#define FP_REVIVED 0002 /* Indicates process is being revived */
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#define FP_SESLDR 0004 /* Set if process is session leader */
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#define FP_PENDING 0010 /* Set if process has pending work */
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#define FP_EXITING 0020 /* Set if process is exiting */
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#define FP_PM_WORK 0040 /* Set if process has a postponed PM request */
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/* Field values. */
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#define NOT_REVIVING 0xC0FFEEE /* process is not being revived */
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#define REVIVING 0xDEEAD /* process is being revived from suspension */
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#define PID_FREE 0 /* process slot free */
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#endif /* __VFS_FPROC_H__ */
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