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minix/servers/vfs/proto.h
David van Moolenbroek 723e51327f VFS: worker thread model overhaul 
The main purpose of this patch is to fix handling of unpause calls
from PM while another call is ongoing. The solution to this problem
sparked a full revision of the threading model, consisting of a large
number of related changes:

- all active worker threads are now always associated with a process,
  and every process has at most one active thread working for it;
- the process lock is always held by a process's worker thread;
- a process can now have both normal work and postponed PM work
  associated to it;
- timer expiry and non-postponed PM work is done from the main thread;
- filp garbage collection is done from a thread associated with VFS;
- reboot calls from PM are now done from a thread associated with PM;
- the DS events handler is protected from starting multiple threads;
- support for a system worker thread has been removed;
- the deadlock recovery thread has been replaced by a parameter to the
  worker_start() function; the number of worker threads has
  consequently been increased by one;
- saving and restoring of global but per-thread variables is now
  centralized in worker_suspend() and worker_resume(); err_code is now
  saved and restored in all cases;
- the concept of jobs has been removed, and job_m_in now points to a
  message stored in the worker thread structure instead;
- the PM lock has been removed;
- the separate exec lock has been replaced by a lock on the VM
  process, which was already being locked for exec calls anyway;
- PM_UNPAUSE is now processed as a postponed PM request, from a thread
  associated with the target process;
- the FP_DROP_WORK flag has been removed, since it is no longer more
  than just an optimization and only applied to processes operating on
  a pipe when getting killed;
- assignment to "fp" now takes place only when obtaining new work in
  the main thread or a worker thread, when resuming execution of a
  thread, and in the special case of exiting processes during reboot;
- there are no longer special cases where the yield() call is used to
  force a thread to run.

Change-Id: I7a97b9b95c2450454a9b5318dfa0e6150d4e6858
2014-02-18 11:25:03 +01:00

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#ifndef __VFS_PROTO_H__
#define __VFS_PROTO_H__
/* Function prototypes. */
#include "timers.h"
#include "request.h"
#include "tll.h"
#include "threads.h"
#include <minix/rs.h>
/* Structs used in prototypes must be declared as such first. */
struct filp;
struct fproc;
struct timespec;
struct vmnt;
struct vnode;
struct lookup;
struct worker_thread;
struct job;
typedef struct filp * filp_id_t;
/* comm.c */
int drv_sendrec(endpoint_t drv_e, message *reqm);
void fs_cancel(struct vmnt *vmp);
int fs_sendrec(endpoint_t fs_e, message *reqm);
void fs_sendmore(struct vmnt *vmp);
void send_work(void);
/* device.c */
int dev_open(dev_t dev, endpoint_t proc_e, int flags);
int dev_reopen(dev_t dev, int filp_no, int flags);
int dev_close(dev_t dev, int filp_no);
void cdev_reply(void);
int bdev_open(dev_t dev, int access);
int bdev_close(dev_t dev);
void bdev_reply(struct dmap *dp);
int dev_io(int op, dev_t dev, endpoint_t proc_e, void *buf, off_t pos,
size_t bytes, int flags, int suspend_reopen);
int gen_opcl(int op, dev_t dev, endpoint_t task_nr, int flags);
int gen_io(endpoint_t drv_e, message *mess_ptr);
int no_dev(int op, dev_t dev, endpoint_t proc, int flags);
int no_dev_io(endpoint_t, message *);
int tty_opcl(int op, dev_t dev, endpoint_t proc, int flags);
int ctty_opcl(int op, dev_t dev, endpoint_t proc, int flags);
int clone_opcl(int op, dev_t dev, endpoint_t proc, int flags);
int ctty_io(endpoint_t task_nr, message *mess_ptr);
int do_ioctl(message *m_out);
int dev_select(dev_t dev, int ops);
int dev_cancel(dev_t dev);
void pm_setsid(endpoint_t proc_e);
void bdev_up(int major);
void cdev_up(int major);
/* dmap.c */
void lock_dmap(struct dmap *dp);
void unlock_dmap(struct dmap *dp);
int do_mapdriver(void);
void init_dmap(void);
void init_dmap_locks(void);
int dmap_driver_match(endpoint_t proc, int major);
void dmap_endpt_up(endpoint_t proc_nr, int is_blk);
void dmap_unmap_by_endpt(endpoint_t proc_nr);
struct dmap *get_dmap(endpoint_t proc_e);
struct dmap *get_dmap_by_major(int major);
int do_mapdriver(void);
int map_service(struct rprocpub *rpub);
void dmap_unmap_by_endpt(endpoint_t proc_nr);
int map_driver(const char *label, int major, endpoint_t proc_nr, int
dev_style, int flags);
int map_service(struct rprocpub *rpub);
/* elf_core_dump.c */
void write_elf_core_file(struct filp *f, int csig, char *exe_name);
/* exec.c */
int pm_exec(vir_bytes path, size_t path_len, vir_bytes frame, size_t frame_len,
vir_bytes *pc, vir_bytes *newsp, vir_bytes *ps_str, int flags);
/* filedes.c */
int do_filp_gc(void);
void check_filp_locks(void);
void check_filp_locks_by_me(void);
void init_filps(void);
struct filp *find_filp(struct vnode *vp, mode_t bits);
int get_fd(struct fproc *rfp, int start, mode_t bits, int *k,
struct filp **fpt);
struct filp *get_filp(int fild, tll_access_t locktype);
struct filp *get_filp2(struct fproc *rfp, int fild, tll_access_t locktype);
void lock_filp(struct filp *filp, tll_access_t locktype);
void unlock_filp(struct filp *filp);
void unlock_filps(struct filp *filp1, struct filp *filp2);
int invalidate_filp(struct filp *);
void invalidate_filp_by_endpt(endpoint_t proc_e);
void invalidate_filp_by_char_major(int major);
int do_verify_fd(message *m_out);
int set_filp(filp_id_t sfilp);
int do_set_filp(message *m_out);
int copy_filp(endpoint_t to_ep, filp_id_t cfilp);
int do_copy_filp(message *m_out);
int put_filp(filp_id_t pfilp);
int do_put_filp(message *m_out);
int cancel_fd(endpoint_t ep, int fd);
int do_cancel_fd(message *m_out);
void close_filp(struct filp *fp);
/* fscall.c */
void nested_fs_call(message *m);
/* link.c */
int do_link(message *m_out);
int do_unlink(message *m_out);
int do_rename(message *m_out);
int do_truncate(message *m_out);
int do_ftruncate(message *m_out);
int truncate_vnode(struct vnode *vp, off_t newsize);
int rdlink_direct(char *orig_path, char *link_path, struct fproc *rfp);
/* lock.c */
int lock_op(struct filp *f, int req);
void lock_revive(void);
/* main.c */
int main(void);
void lock_proc(struct fproc *rfp);
void unlock_proc(struct fproc *rfp);
void reply(message *m_out, endpoint_t whom, int result);
void replycode(endpoint_t whom, int result);
void service_pm_postponed(void);
void thread_cleanup(void);
/* misc.c */
void pm_exit(void);
int do_fcntl(message *m_out);
void pm_fork(endpoint_t pproc, endpoint_t cproc, pid_t cpid);
void pm_setgid(endpoint_t proc_e, int egid, int rgid);
void pm_setuid(endpoint_t proc_e, int euid, int ruid);
void pm_setgroups(endpoint_t proc_e, int ngroups, gid_t *addr);
int do_sync(message *m_out);
int do_fsync(message *m_out);
void pm_reboot(void);
int do_svrctl(message *m_out);
int do_getsysinfo(void);
int do_vm_call(message *m_out);
int pm_dumpcore(int sig, vir_bytes exe_name);
void ds_event(void);
int dupvm(struct fproc *fp, int pfd, int *vmfd, struct filp **f);
int do_getrusage(message *m_out);
/* mount.c */
int do_fsready(message *m_out);
int do_mount(message *m_out);
int do_umount(message *m_out);
int is_nonedev(dev_t dev);
void mount_pfs(void);
int mount_fs(dev_t dev, char mount_dev[PATH_MAX], char mount_path[PATH_MAX],
endpoint_t fs_e, int rdonly, char mount_type[FSTYPE_MAX],
char mount_label[LABEL_MAX]);
int unmount(dev_t dev, char label[LABEL_MAX]);
void unmount_all(int force);
/* open.c */
int do_close(message *m_out);
int close_fd(struct fproc *rfp, int fd_nr);
int common_open(char path[PATH_MAX], int oflags, mode_t omode);
int do_creat(void);
int do_lseek(message *m_out);
int do_mknod(message *m_out);
int do_mkdir(message *m_out);
int do_open(message *m_out);
int do_slink(message *m_out);
int actual_llseek(struct fproc *rfp, message *m_out, int seekfd,
int seekwhence, off_t offset);
int do_vm_open(void);
int do_vm_close(void);
/* path.c */
struct vnode *advance(struct vnode *dirp, struct lookup *resolve, struct
fproc *rfp);
struct vnode *eat_path(struct lookup *resolve, struct fproc *rfp);
struct vnode *last_dir(struct lookup *resolve, struct fproc *rfp);
void lookup_init(struct lookup *resolve, char *path, int flags, struct
vmnt **vmp, struct vnode **vp);
int get_name(struct vnode *dirp, struct vnode *entry, char *_name);
int canonical_path(char *orig_path, struct fproc *rfp);
int do_check_perms(message *m_out);
/* pipe.c */
int do_pipe(message *m_out);
int do_pipe2(message *m_out);
int map_vnode(struct vnode *vp, endpoint_t fs_e);
void unpause(void);
int pipe_check(struct filp *filp, int rw_flag, int oflags, int bytes,
int notouch);
void release(struct vnode *vp, int op, int count);
void revive(endpoint_t proc_e, int returned);
void suspend(int why);
void pipe_suspend(struct filp *rfilp, char *buf, size_t size);
void unsuspend_by_endpt(endpoint_t proc_e);
void wait_for(endpoint_t proc_e);
/* protect.c */
int do_access(message *m_out);
int do_chmod(message *m_out);
int do_chown(message *m_out);
int do_umask(message *m_out);
int forbidden(struct fproc *rfp, struct vnode *vp, mode_t
access_desired);
int read_only(struct vnode *vp);
/* read.c */
int do_read(message *m_out);
int do_getdents(message *m_out);
void lock_bsf(void);
void unlock_bsf(void);
void check_bsf_lock(void);
int do_read_write_peek(int rw_flag, int fd, char *buf, size_t bytes);
int actual_read_write_peek(struct fproc *rfp, int rw_flag, int fd, char *buf,
size_t bytes);
int read_write(struct fproc *rfp, int rw_flag, struct filp *f, char *buffer,
size_t nbytes, endpoint_t for_e);
int rw_pipe(int rw_flag, endpoint_t usr, struct filp *f, char *buf,
size_t req_size);
/* request.c */
int req_breadwrite(endpoint_t fs_e, endpoint_t user_e, dev_t dev, off_t pos,
unsigned int num_of_bytes, vir_bytes user_addr, int rw_flag,
off_t *new_posp, unsigned int *cum_iop);
int req_chmod(endpoint_t fs_e, ino_t inode_nr, mode_t rmode,
mode_t *new_modep);
int req_chown(endpoint_t fs_e, ino_t inode_nr, uid_t newuid, gid_t newgid,
mode_t *new_modep);
int req_create(endpoint_t fs_e, ino_t inode_nr, int omode, uid_t uid,
gid_t gid, char *path, node_details_t *res);
int req_flush(endpoint_t fs_e, dev_t dev);
int req_statvfs(endpoint_t fs_e, struct statvfs *buf);
int req_ftrunc(endpoint_t fs_e, ino_t inode_nr, off_t start, off_t end);
int req_getdents(endpoint_t fs_e, ino_t inode_nr, off_t pos, char *buf,
size_t size, off_t *new_pos, int direct);
int req_inhibread(endpoint_t fs_e, ino_t inode_nr);
int req_link(endpoint_t fs_e, ino_t link_parent, char *lastc,
ino_t linked_file);
int req_lookup(endpoint_t fs_e, ino_t dir_ino, ino_t root_ino, uid_t uid,
gid_t gid, struct lookup *resolve, lookup_res_t *res,
struct fproc *rfp);
int req_mkdir(endpoint_t fs_e, ino_t inode_nr, char *lastc, uid_t uid,
gid_t gid, mode_t dmode);
int req_mknod(endpoint_t fs_e, ino_t inode_nr, char *lastc, uid_t uid,
gid_t gid, mode_t dmode, dev_t dev);
int req_mountpoint(endpoint_t fs_e, ino_t inode_nr);
int req_newnode(endpoint_t fs_e, uid_t uid, gid_t gid, mode_t dmode,
dev_t dev, struct node_details *res);
int req_putnode(int fs_e, ino_t inode_nr, int count);
int req_rdlink(endpoint_t fs_e, ino_t inode_nr, endpoint_t proc_e,
vir_bytes buf, size_t len, int direct);
int req_readsuper(struct vmnt *vmp, char *driver_name, dev_t dev, int readonly,
int isroot, struct node_details *res_nodep, unsigned int *fs_flags);
int req_readwrite(endpoint_t fs_e, ino_t inode_nr, off_t pos, int rw_flag,
endpoint_t user_e, vir_bytes user_addr, unsigned int num_of_bytes,
off_t *new_posp, unsigned int *cum_iop);
int req_bpeek(endpoint_t fs_e, dev_t dev, off_t pos, unsigned int num_of_bytes);
int req_peek(endpoint_t fs_e, ino_t inode_nr, off_t pos, unsigned int bytes);
int req_rename(endpoint_t fs_e, ino_t old_dir, char *old_name, ino_t new_dir,
char *new_name);
int req_rmdir(endpoint_t fs_e, ino_t inode_nr, char *lastc);
int req_slink(endpoint_t fs_e, ino_t inode_nr, char *lastc, endpoint_t proc_e,
vir_bytes path_addr, size_t path_length, uid_t uid, gid_t gid);
int req_stat(endpoint_t fs_e, ino_t inode_nr, endpoint_t proc_e, vir_bytes buf);
int req_sync(endpoint_t fs_e);
int req_unlink(endpoint_t fs_e, ino_t inode_nr, char *lastc);
int req_unmount(endpoint_t fs_e);
int req_utime(endpoint_t fs_e, ino_t inode_nr, struct timespec * actv,
struct timespec * modtv);
int req_newdriver(endpoint_t fs_e, dev_t dev, char *label);
/* stadir.c */
int do_chdir(message *m_out);
int do_fchdir(message *m_out);
int do_chroot(message *m_out);
int do_fstat(message *m_out);
int do_stat(message *m_out);
int do_statvfs(message *m_out);
int do_fstatvfs(message *m_out);
int do_getvfsstat(message *m_out);
int do_rdlink(message *m_out);
int do_lstat(message *m_out);
int update_statvfs(struct vmnt *vmp, struct statvfs *buf);
/* time.c */
int do_utime(message *);
int do_utimens(message *);
/* tll.c */
void tll_downgrade(tll_t *tllp);
int tll_haspendinglock(tll_t *tllp);
void tll_init(tll_t *tllp);
int tll_islocked(tll_t *tllp);
int tll_lock(tll_t *tllp, tll_access_t locktype);
int tll_locked_by_me(tll_t *tllp);
void tll_lockstat(tll_t *tllp);
int tll_unlock(tll_t *tllp);
void tll_upgrade(tll_t *tllp);
/* utility.c */
struct timespec clock_timespec(void);
unsigned conv2(int norm, int w);
long conv4(int norm, long x);
int copy_name(size_t len, char *dest);
int fetch_name(vir_bytes path, size_t len, char *dest);
int no_sys(message *);
int isokendpt_f(char *f, int l, endpoint_t e, int *p, int ft);
int in_group(struct fproc *rfp, gid_t grp);
#define okendpt(e, p) isokendpt_f(__FILE__, __LINE__, (e), (p), 1)
#define isokendpt(e, p) isokendpt_f(__FILE__, __LINE__, (e), (p), 0)
/* vmnt.c */
void check_vmnt_locks(void);
void check_vmnt_locks_by_me(struct fproc *rfp);
void mark_vmnt_free(struct vmnt *vmp);
struct vmnt *get_free_vmnt(void);
struct vmnt *find_vmnt(endpoint_t fs_e);
struct vmnt *get_locked_vmnt(struct fproc *rfp);
void init_vmnts(void);
int lock_vmnt(struct vmnt *vp, tll_access_t locktype);
void unlock_vmnt(struct vmnt *vp);
void vmnt_unmap_by_endpt(endpoint_t proc_e);
void fetch_vmnt_paths(void);
void upgrade_vmnt_lock(struct vmnt *vmp);
void downgrade_vmnt_lock(struct vmnt *vmp);
/* vnode.c */
void check_vnode_locks(void);
void check_vnode_locks_by_me(struct fproc *rfp);
struct vnode *get_free_vnode(void);
struct vnode *find_vnode(int fs_e, ino_t inode);
void init_vnodes(void);
int is_vnode_locked(struct vnode *vp);
int lock_vnode(struct vnode *vp, tll_access_t locktype);
void unlock_vnode(struct vnode *vp);
void dup_vnode(struct vnode *vp);
void put_vnode(struct vnode *vp);
void vnode_clean_refs(struct vnode *vp);
void upgrade_vnode_lock(struct vnode *vp);
/* write.c */
int do_write(message *m_out);
/* gcov.c */
int do_gcov_flush(void);
#if ! USE_COVERAGE
#define do_gcov_flush no_sys
#endif
/* select.c */
int do_select(message *m_out);
void init_select(void);
void select_callback(struct filp *, int ops);
void select_forget(void);
void select_reply1(endpoint_t driver_e, int minor, int status);
void select_reply2(endpoint_t driver_e, int minor, int status);
void select_timeout_check(timer_t *);
void select_unsuspend_by_endpt(endpoint_t proc);
/* worker.c */
void worker_init(void);
int worker_available(void);
struct worker_thread *worker_get(thread_t worker_tid);
void worker_signal(struct worker_thread *worker);
int worker_can_start(struct fproc *rfp);
void worker_start(struct fproc *rfp, void (*func)(void), message *m_ptr,
int use_spare);
void worker_stop(struct worker_thread *worker);
void worker_stop_by_endpt(endpoint_t proc_e);
void worker_wait(void);
struct worker_thread *worker_suspend(void);
void worker_resume(struct worker_thread *org_self);
void worker_set_proc(struct fproc *rfp);
#endif
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