232819dd49
Previously, VFS would use various subsets of a number of fproc structure fields to store state when the process is blocked (suspended) for various reasons. As a result, there was a fair amount of abuse of fields, hidden state, and confusion as to which fields were used with which suspension states. Instead, the suspension state is now split into per-state structures, which are then stored in a union. Each of the union's structures should be accessed only right before, during, and right after the fp_blocked_on field is set to the corresponding blocking type. As a result, it is now very clear which fields are in use at which times, and we even save a bit of memory as a side effect. Change-Id: I5c24e353b6cb0c32eb41c70f89c5cfb23f6c93df
108 lines
3.9 KiB
C
108 lines
3.9 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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#include <minix/sef.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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union ixfer_fp_u { /* state per blocking type */
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struct { /* FP_BLOCKED_ON_PIPE */
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int callnr; /* user call: VFS_READ or VFS_WRITE */
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int fd; /* file descriptor for blocking call */
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vir_bytes buf; /* user buffer address */
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size_t nbytes; /* number of bytes left */
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size_t cum_io; /* partial (write) result byte count */
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} u_pipe;
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struct { /* FP_BLOCKED_ON_POPEN */
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int fd; /* file descriptor for blocking call */
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} u_popen;
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struct { /* FP_BLOCKED_ON_FLOCK */
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int fd; /* file descriptor for blocking call */
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int cmd; /* fcntl command, always F_SETLKW */
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vir_bytes arg; /* user address of flock structure */
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} u_flock;
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/* nothing for FP_BLOCKED_ON_SELECT for now */
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struct { /* FP_BLOCKED_ON_CDEV */
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dev_t dev; /* device number for blocking call */
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endpoint_t endpt; /* driver endpoint */
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cp_grant_id_t grant; /* data grant */
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} u_cdev;
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} fp_u;
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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)(void); /* 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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} fproc[NR_PROCS];
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/* Shortcuts for block state union substructures. */
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#define fp_pipe fp_u.u_pipe
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#define fp_popen fp_u.u_popen
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#define fp_flock fp_u.u_flock
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#define fp_cdev fp_u.u_cdev
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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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/*
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* Upon request from the MIB service, this table is filled with a relatively
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* small subset of per-process fields, so that the MIB service can avoid
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* pulling in the entire fproc table. Other fields may be added to this
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* structure as required by the MIB service.
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*/
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EXTERN struct fproc_light {
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dev_t fpl_tty; /* copy of fproc.fp_tty */
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int fpl_blocked_on; /* copy of fproc.fp_blocked_on */
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endpoint_t fpl_task; /* copy of fproc.fp_task */
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} fproc_light[NR_PROCS];
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#endif /* __VFS_FPROC_H__ */
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