/* When a needed block is not in the cache, it must be fetched from the disk. * Special character files also require I/O. The routines for these are here. * * The entry points in this file are: * dev_open: FS opens a device * dev_close: FS closes a device * dev_io: FS does a read or write on a device * dev_status: FS processes callback request alert * gen_opcl: generic call to a task to perform an open/close * gen_io: generic call to a task to perform an I/O operation * no_dev: open/close processing for devices that don't exist * no_dev_io: i/o processing for devices that don't exist * tty_opcl: perform tty-specific processing for open/close * ctty_opcl: perform controlling-tty-specific processing for open/close * ctty_io: perform controlling-tty-specific processing for I/O * do_ioctl: perform the IOCTL system call * do_setsid: perform the SETSID system call (FS side) */ #include "fs.h" #include #include #include #include #include #include #include #include "file.h" #include "fproc.h" #include #include "vnode.h" #include "vmnt.h" #include "param.h" #define ELEMENTS(a) (sizeof(a)/sizeof((a)[0])) FORWARD _PROTOTYPE( int safe_io_conversion, (endpoint_t, cp_grant_id_t *, int *, cp_grant_id_t *, int, endpoint_t *, void **, int *, vir_bytes, off_t *)); FORWARD _PROTOTYPE( void safe_io_cleanup, (cp_grant_id_t, cp_grant_id_t *, int)); extern int dmap_size; PRIVATE int dummyproc; /*===========================================================================* * dev_open * *===========================================================================*/ PUBLIC int dev_open(dev, proc, flags) dev_t dev; /* device to open */ int proc; /* process to open for */ int flags; /* mode bits and flags */ { int major, r; struct dmap *dp; /* Determine the major device number call the device class specific * open/close routine. (This is the only routine that must check the * device number for being in range. All others can trust this check.) */ major = (dev >> MAJOR) & BYTE; if (major >= NR_DEVICES) major = 0; dp = &dmap[major]; if (dp->dmap_driver == NONE) return ENXIO; r = (*dp->dmap_opcl)(DEV_OPEN, dev, proc, flags); if (r == SUSPEND) panic(__FILE__,"suspend on open from", dp->dmap_driver); return(r); } /*===========================================================================* * dev_close * *===========================================================================*/ PUBLIC void dev_close(dev) dev_t dev; /* device to close */ { /* See if driver is roughly valid. */ if (dmap[(dev >> MAJOR)].dmap_driver == NONE) { return; } (void) (*dmap[(dev >> MAJOR) & BYTE].dmap_opcl)(DEV_CLOSE, dev, 0, 0); } /*===========================================================================* * suspended_ep * *===========================================================================*/ endpoint_t suspended_ep(endpoint_t driver, cp_grant_id_t g) { /* A process is suspended on a driver for which FS issued * a grant. Find out which process it was. */ struct fproc *rfp; for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) { if(rfp->fp_pid == PID_FREE) continue; if(rfp->fp_suspended == SUSPENDED && rfp->fp_task == -driver && rfp->fp_grant == g) { return rfp->fp_endpoint; } } return NONE; } /*===========================================================================* * dev_status * *===========================================================================*/ PUBLIC void dev_status(message *m) { message st; int d, get_more = 1; endpoint_t endpt; for(d = 0; d < NR_DEVICES; d++) if (dmap[d].dmap_driver != NONE && dmap[d].dmap_driver == m->m_source) break; if (d >= NR_DEVICES) return; do { int r; st.m_type = DEV_STATUS; if ((r=sendrec(m->m_source, &st)) != OK) { printf("DEV_STATUS failed to %d: %d\n", m->m_source, r); if (r == EDEADSRCDST) return; if (r == EDSTDIED) return; if (r == ESRCDIED) return; panic(__FILE__,"couldn't sendrec for DEV_STATUS", r); } switch(st.m_type) { case DEV_REVIVE: endpt = st.REP_ENDPT; if(endpt == FS_PROC_NR) { endpt = suspended_ep(m->m_source, st.REP_IO_GRANT); if(endpt == NONE) { printf("FS: proc with " "grant %d from %d not found (revive)\n", st.m_source, st.REP_IO_GRANT); continue; } } revive(endpt, st.REP_STATUS); break; case DEV_IO_READY: select_notified(d, st.DEV_MINOR, st.DEV_SEL_OPS); break; default: printf("FS: unrecognized reply %d to " "DEV_STATUS\n", st.m_type); /* Fall through. */ case DEV_NO_STATUS: get_more = 0; break; } } while(get_more); return; } /*===========================================================================* * safe_io_conversion * *===========================================================================*/ PRIVATE int safe_io_conversion(driver, gid, op, gids, gids_size, io_ept, buf, vec_grants, bytes, pos) endpoint_t driver; cp_grant_id_t *gid; int *op; cp_grant_id_t *gids; int gids_size; endpoint_t *io_ept; void **buf; int *vec_grants; vir_bytes bytes; off_t *pos; { int access = 0, size; int j; iovec_t *v; static iovec_t new_iovec[NR_IOREQS]; /* Number of grants allocated in vector I/O. */ *vec_grants = 0; /* Driver can handle it - change request to a safe one. */ *gid = GRANT_INVALID; switch(*op) { case DEV_READ: case DEV_WRITE: /* Change to safe op. */ *op = *op == DEV_READ ? DEV_READ_S : DEV_WRITE_S; if((*gid=cpf_grant_magic(driver, *io_ept, (vir_bytes) *buf, bytes, *op == DEV_READ_S ? CPF_WRITE : CPF_READ)) < 0) { panic(__FILE__, "cpf_grant_magic of buffer failed\n", NO_NUM); } break; case DEV_GATHER: case DEV_SCATTER: /* Change to safe op. */ *op = *op == DEV_GATHER ? DEV_GATHER_S : DEV_SCATTER_S; /* Grant access to my new i/o vector. */ if((*gid = cpf_grant_direct(driver, (vir_bytes) new_iovec, bytes * sizeof(iovec_t), CPF_READ | CPF_WRITE)) < 0) { panic(__FILE__, "cpf_grant_direct of vector failed", NO_NUM); } v = (iovec_t *) *buf; /* Grant access to i/o buffers. */ for(j = 0; j < bytes; j++) { if(j >= NR_IOREQS) panic(__FILE__, "vec too big", bytes); new_iovec[j].iov_addr = gids[j] = cpf_grant_direct(driver, (vir_bytes) v[j].iov_addr, v[j].iov_size, *op == DEV_GATHER_S ? CPF_WRITE : CPF_READ); if(!GRANT_VALID(gids[j])) { panic(__FILE__, "grant to iovec buf failed", NO_NUM); } new_iovec[j].iov_size = v[j].iov_size; (*vec_grants)++; } /* Set user's vector to the new one. */ *buf = new_iovec; break; case DEV_IOCTL: *pos = *io_ept; /* Old endpoint in POSITION field. */ *op = DEV_IOCTL_S; if(_MINIX_IOCTL_IOR(m_in.REQUEST)) access |= CPF_WRITE; if(_MINIX_IOCTL_IOW(m_in.REQUEST)) access |= CPF_READ; if(_MINIX_IOCTL_BIG(m_in.REQUEST)) size = _MINIX_IOCTL_SIZE_BIG(m_in.REQUEST); else size = _MINIX_IOCTL_SIZE(m_in.REQUEST); /* Do this even if no I/O happens with the ioctl, in * order to disambiguate requests with DEV_IOCTL_S. */ if((*gid=cpf_grant_magic(driver, *io_ept, (vir_bytes) *buf, size, access)) < 0) { panic(__FILE__, "cpf_grant_magic failed (ioctl)\n", NO_NUM); } } /* If we have converted to a safe operation, I/O * endpoint becomes FS if it wasn't already. */ if(GRANT_VALID(*gid)) { *io_ept = FS_PROC_NR; return 1; } /* Not converted to a safe operation (because there is no * copying involved in this operation). */ return 0; } /*===========================================================================* * safe_io_cleanup * *===========================================================================*/ PRIVATE void safe_io_cleanup(gid, gids, gids_size) cp_grant_id_t gid; cp_grant_id_t *gids; int gids_size; { /* Free resources (specifically, grants) allocated by safe_io_conversion(). */ int j; cpf_revoke(gid); for(j = 0; j < gids_size; j++) cpf_revoke(gids[j]); return; } /*===========================================================================* * dev_bio * *===========================================================================*/ PUBLIC int dev_bio(op, dev, proc_e, buf, pos, bytes) int op; /* DEV_READ, DEV_WRITE, DEV_IOCTL, etc. */ dev_t dev; /* major-minor device number */ int proc_e; /* in whose address space is buf? */ void *buf; /* virtual address of the buffer */ off_t pos; /* byte position */ int bytes; /* how many bytes to transfer */ { /* Read or write from a device. The parameter 'dev' tells which one. */ struct dmap *dp; int r, safe; message m; iovec_t *v; cp_grant_id_t gid = GRANT_INVALID; int vec_grants; /* Determine task dmap. */ dp = &dmap[(dev >> MAJOR) & BYTE]; /* The io vector copying relies on this I/O being for FS itself. */ if(proc_e != FS_PROC_NR) panic(__FILE__, "doing dev_bio for non-self", proc_e); for (;;) { int op_used; void *buf_used; static cp_grant_id_t gids[NR_IOREQS]; cp_grant_id_t gid = GRANT_INVALID; int vec_grants; /* See if driver is roughly valid. */ if (dp->dmap_driver == NONE) { printf("FS: dev_io: no driver for dev %x\n", dev); return ENXIO; } /* By default, these are right. */ m.IO_ENDPT = proc_e; m.ADDRESS = buf; buf_used = buf; /* Convert parameters to 'safe mode'. */ op_used = op; safe = safe_io_conversion(dp->dmap_driver, &gid, &op_used, gids, NR_IOREQS, &m.IO_ENDPT, &buf_used, &vec_grants, bytes, &pos); /* Set up rest of the message. */ if(safe) m.IO_GRANT = (char *) gid; m.m_type = op_used; m.DEVICE = (dev >> MINOR) & BYTE; m.POSITION = pos; m.COUNT = bytes; m.HIGHPOS = 0; /* Call the task. */ (*dp->dmap_io)(dp->dmap_driver, &m); /* As block I/O never SUSPENDs, safe cleanup must be done whether * the I/O succeeded or not. */ if(safe) safe_io_cleanup(gid, gids, vec_grants); if(dp->dmap_driver == NONE) { /* Driver has vanished. Wait for a new one. */ for (;;) { r= receive(RS_PROC_NR, &m); if (r != OK) { panic(__FILE__, "dev_bio: unable to receive from RS", r); } if (m.m_type == DEVCTL) { r= fs_devctl(m.ctl_req, m.dev_nr, m.driver_nr, m.dev_style, m.m_force); } else { panic(__FILE__, "dev_bio: got message from RS, type", m.m_type); } m.m_type= r; r= send(RS_PROC_NR, &m); if (r != OK) { panic(__FILE__, "dev_bio: unable to send to RS", r); } if (dp->dmap_driver != NONE) break; } printf("dev_bio: trying new driver\n"); continue; } /* Task has completed. See if call completed. */ if (m.REP_STATUS == SUSPEND) { panic(__FILE__, "dev_bio: driver returned SUSPEND", NO_NUM); } if(buf != buf_used) { memcpy(buf, buf_used, bytes * sizeof(iovec_t)); } return(m.REP_STATUS); } } /*===========================================================================* * dev_io * *===========================================================================*/ PUBLIC int dev_io(op, dev, proc_e, buf, posX, bytes, flags) int op; /* DEV_READ, DEV_WRITE, DEV_IOCTL, etc. */ dev_t dev; /* major-minor device number */ int proc_e; /* in whose address space is buf? */ void *buf; /* virtual address of the buffer */ u64_t posX; /* byte position */ int bytes; /* how many bytes to transfer */ int flags; /* special flags, like O_NONBLOCK */ { /* Read or write from a device. The parameter 'dev' tells which one. */ struct dmap *dp; off_t pos; message dev_mess; cp_grant_id_t gid = GRANT_INVALID; static cp_grant_id_t gids[NR_IOREQS]; int vec_grants = 0, orig_op, safe; void *buf_used; endpoint_t ioproc; if (ex64hi(posX) != 0) panic(__FILE__, "dev_io: postition too high", NO_NUM); pos= ex64lo(posX); /* Determine task dmap. */ dp = &dmap[(dev >> MAJOR) & BYTE]; orig_op = op; /* See if driver is roughly valid. */ if (dp->dmap_driver == NONE) { printf("FS: dev_io: no driver for dev %x\n", dev); return ENXIO; } if(isokendpt(dp->dmap_driver, &dummyproc) != OK) { printf("FS: dev_io: old driver for dev %x (%d)\n", dev, dp->dmap_driver); return ENXIO; } /* By default, these are right. */ dev_mess.IO_ENDPT = proc_e; dev_mess.ADDRESS = buf; /* Convert DEV_* to DEV_*_S variants. */ buf_used = buf; safe = safe_io_conversion(dp->dmap_driver, &gid, &op, gids, NR_IOREQS, &dev_mess.IO_ENDPT, &buf_used, &vec_grants, bytes, &pos); if(buf != buf_used) panic(__FILE__,"dev_io: safe_io_conversion changed buffer", NO_NUM); /* If the safe conversion was done, set the ADDRESS to * the grant id. */ if(safe) dev_mess.IO_GRANT = (char *) gid; /* Set up the rest of the message passed to task. */ dev_mess.m_type = op; dev_mess.DEVICE = (dev >> MINOR) & BYTE; dev_mess.POSITION = pos; dev_mess.COUNT = bytes; dev_mess.HIGHPOS = 0; /* This will be used if the i/o is suspended. */ ioproc = dev_mess.IO_ENDPT; /* Call the task. */ (*dp->dmap_io)(dp->dmap_driver, &dev_mess); if(dp->dmap_driver == NONE) { /* Driver has vanished. */ printf("Driver gone?\n"); if(safe) safe_io_cleanup(gid, gids, vec_grants); return EIO; } /* Task has completed. See if call completed. */ if (dev_mess.REP_STATUS == SUSPEND) { if(vec_grants > 0) { panic(__FILE__,"SUSPEND on vectored i/o", NO_NUM); } /* fp is uninitialized at init time. */ if(!fp) panic(__FILE__,"SUSPEND on NULL fp", NO_NUM); if (flags & O_NONBLOCK) { /* Not supposed to block. */ dev_mess.m_type = CANCEL; dev_mess.IO_ENDPT = ioproc; dev_mess.IO_GRANT = (char *) gid; /* This R_BIT/W_BIT check taken from suspend()/unpause() * logic. Mode is expected in the COUNT field. */ dev_mess.COUNT = 0; if(call_nr == READ) dev_mess.COUNT = R_BIT; else if(call_nr == WRITE) dev_mess.COUNT = W_BIT; dev_mess.DEVICE = (dev >> MINOR) & BYTE; (*dp->dmap_io)(dp->dmap_driver, &dev_mess); if (dev_mess.REP_STATUS == EINTR) dev_mess.REP_STATUS = EAGAIN; } else { /* Suspend user. */ suspend(dp->dmap_driver); assert(!GRANT_VALID(fp->fp_grant)); fp->fp_grant = gid; /* revoke this when unsuspended. */ fp->fp_ioproc = ioproc; return(SUSPEND); } } /* No suspend, or cancelled suspend, so I/O is over and can be cleaned up. */ if(safe) safe_io_cleanup(gid, gids, vec_grants); return(dev_mess.REP_STATUS); } /*===========================================================================* * gen_opcl * *===========================================================================*/ PUBLIC int gen_opcl(op, dev, proc_e, flags) int op; /* operation, DEV_OPEN or DEV_CLOSE */ dev_t dev; /* device to open or close */ int proc_e; /* process to open/close for */ int flags; /* mode bits and flags */ { /* Called from the dmap struct in table.c on opens & closes of special files.*/ struct dmap *dp; message dev_mess; /* Determine task dmap. */ dp = &dmap[(dev >> MAJOR) & BYTE]; dev_mess.m_type = op; dev_mess.DEVICE = (dev >> MINOR) & BYTE; dev_mess.IO_ENDPT = proc_e; dev_mess.COUNT = flags; if (dp->dmap_driver == NONE) { printf("FS: gen_opcl: no driver for dev %x\n", dev); return ENXIO; } /* Call the task. */ (*dp->dmap_io)(dp->dmap_driver, &dev_mess); return(dev_mess.REP_STATUS); } /*===========================================================================* * tty_opcl * *===========================================================================*/ PUBLIC int tty_opcl(op, dev, proc_e, flags) int op; /* operation, DEV_OPEN or DEV_CLOSE */ dev_t dev; /* device to open or close */ int proc_e; /* process to open/close for */ int flags; /* mode bits and flags */ { /* This procedure is called from the dmap struct on tty open/close. */ int r; register struct fproc *rfp; /* Add O_NOCTTY to the flags if this process is not a session leader, or * if it already has a controlling tty, or if it is someone elses * controlling tty. */ if (!fp->fp_sesldr || fp->fp_tty != 0) { flags |= O_NOCTTY; } else { for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) { if(rfp->fp_pid == PID_FREE) continue; if (rfp->fp_tty == dev) flags |= O_NOCTTY; } } r = gen_opcl(op, dev, proc_e, flags); /* Did this call make the tty the controlling tty? */ if (r == 1) { fp->fp_tty = dev; r = OK; } return(r); } /*===========================================================================* * ctty_opcl * *===========================================================================*/ PUBLIC int ctty_opcl(op, dev, proc_e, flags) int op; /* operation, DEV_OPEN or DEV_CLOSE */ dev_t dev; /* device to open or close */ int proc_e; /* process to open/close for */ int flags; /* mode bits and flags */ { /* This procedure is called from the dmap struct in table.c on opening/closing * /dev/tty, the magic device that translates to the controlling tty. */ return(fp->fp_tty == 0 ? ENXIO : OK); } /*===========================================================================* * pm_setsid * *===========================================================================*/ PUBLIC void pm_setsid(proc_e) int proc_e; { /* Perform the FS side of the SETSID call, i.e. get rid of the controlling * terminal of a process, and make the process a session leader. */ register struct fproc *rfp; int slot; /* Make the process a session leader with no controlling tty. */ okendpt(proc_e, &slot); rfp = &fproc[slot]; rfp->fp_sesldr = TRUE; rfp->fp_tty = 0; } /*===========================================================================* * do_ioctl * *===========================================================================*/ PUBLIC int do_ioctl() { /* Perform the ioctl(ls_fd, request, argx) system call (uses m2 fmt). */ struct filp *f; register struct vnode *vp; dev_t dev; if ( (f = get_filp(m_in.ls_fd)) == NIL_FILP) return(err_code); vp = f->filp_vno; /* get vnode pointer */ if ( (vp->v_mode & I_TYPE) != I_CHAR_SPECIAL && (vp->v_mode & I_TYPE) != I_BLOCK_SPECIAL) return(ENOTTY); dev = (dev_t) vp->v_sdev; return(dev_io(DEV_IOCTL, dev, who_e, m_in.ADDRESS, cvu64(0), m_in.REQUEST, f->filp_flags)); } /*===========================================================================* * gen_io * *===========================================================================*/ PUBLIC int gen_io(task_nr, mess_ptr) int task_nr; /* which task to call */ message *mess_ptr; /* pointer to message for task */ { /* All file system I/O ultimately comes down to I/O on major/minor device * pairs. These lead to calls on the following routines via the dmap table. */ int r, proc_e; proc_e = mess_ptr->IO_ENDPT; r = sendrec(task_nr, mess_ptr); if (r != OK) { if (r == EDEADSRCDST || r == EDSTDIED || r == ESRCDIED) { printf("fs: dead driver %d\n", task_nr); dmap_unmap_by_endpt(task_nr); return r; } if (r == ELOCKED) { printf("fs: ELOCKED talking to %d\n", task_nr); return r; } panic(__FILE__,"call_task: can't send/receive", r); } /* Did the process we did the sendrec() for get a result? */ if (mess_ptr->REP_ENDPT != proc_e) { printf( "fs: strange device reply from %d, type = %d, proc = %d (not %d) (2) ignored\n", mess_ptr->m_source, mess_ptr->m_type, proc_e, mess_ptr->REP_ENDPT); return EIO; } return OK; } /*===========================================================================* * ctty_io * *===========================================================================*/ PUBLIC int ctty_io(task_nr, mess_ptr) int task_nr; /* not used - for compatibility with dmap_t */ message *mess_ptr; /* pointer to message for task */ { /* This routine is only called for one device, namely /dev/tty. Its job * is to change the message to use the controlling terminal, instead of the * major/minor pair for /dev/tty itself. */ struct dmap *dp; if (fp->fp_tty == 0) { /* No controlling tty present anymore, return an I/O error. */ mess_ptr->REP_STATUS = EIO; } else { /* Substitute the controlling terminal device. */ dp = &dmap[(fp->fp_tty >> MAJOR) & BYTE]; mess_ptr->DEVICE = (fp->fp_tty >> MINOR) & BYTE; if (dp->dmap_driver == NONE) { printf("FS: ctty_io: no driver for dev\n"); return EIO; } if(isokendpt(dp->dmap_driver, &dummyproc) != OK) { printf("FS: ctty_io: old driver %d\n", dp->dmap_driver); return EIO; } (*dp->dmap_io)(dp->dmap_driver, mess_ptr); } return OK; } /*===========================================================================* * no_dev * *===========================================================================*/ PUBLIC int no_dev(op, dev, proc, flags) int op; /* operation, DEV_OPEN or DEV_CLOSE */ dev_t dev; /* device to open or close */ int proc; /* process to open/close for */ int flags; /* mode bits and flags */ { /* Called when opening a nonexistent device. */ return(ENODEV); } /*===========================================================================* * no_dev_io * *===========================================================================*/ PUBLIC int no_dev_io(int proc, message *m) { /* Called when doing i/o on a nonexistent device. */ printf("VFS: I/O on unmapped device number\n"); return EIO; } /*===========================================================================* * clone_opcl * *===========================================================================*/ PUBLIC int clone_opcl(op, dev, proc_e, flags) int op; /* operation, DEV_OPEN or DEV_CLOSE */ dev_t dev; /* device to open or close */ int proc_e; /* process to open/close for */ int flags; /* mode bits and flags */ { /* Some devices need special processing upon open. Such a device is "cloned", * i.e. on a succesful open it is replaced by a new device with a new unique * minor device number. This new device number identifies a new object (such * as a new network connection) that has been allocated within a task. */ struct dmap *dp; int r, minor; message dev_mess; /* Determine task dmap. */ dp = &dmap[(dev >> MAJOR) & BYTE]; minor = (dev >> MINOR) & BYTE; dev_mess.m_type = op; dev_mess.DEVICE = minor; dev_mess.IO_ENDPT = proc_e; dev_mess.COUNT = flags; if (dp->dmap_driver == NONE) { printf("FS: clone_opcl: no driver for dev %x\n", dev); return ENXIO; } if(isokendpt(dp->dmap_driver, &dummyproc) != OK) { printf("FS: clone_opcl: old driver for dev %x (%d)\n", dev, dp->dmap_driver); return ENXIO; } /* Call the task. */ r= (*dp->dmap_io)(dp->dmap_driver, &dev_mess); if (r != OK) return r; if (op == DEV_OPEN && dev_mess.REP_STATUS >= 0) { if (dev_mess.REP_STATUS != minor) { struct vnode *vp; struct vmnt *vmp; struct clone_opcl_req req; struct node_details res; /* A new minor device number has been returned. * Request root FS to create a temporary device file to hold it. */ /* Device number of the new device. */ dev = (dev & ~(BYTE << MINOR)) | (dev_mess.REP_STATUS << MINOR); /* Fill in request */ req.fs_e = ROOT_FS_E; req.dev = dev; /* Issue request */ if ((r = req_clone_opcl(&req, &res)) != OK) { (void) clone_opcl(DEV_CLOSE, dev, proc_e, 0); return r; } /* Drop old node and use the new values */ vp = fp->fp_filp[m_in.fd]->filp_vno; put_vnode(vp); if ((vp = get_free_vnode()) == NIL_VNODE) { printf("VFSclone_opcl: failed to get a free vnode..\n"); vp = fp->fp_filp[m_in.fd]->filp_vno; } vp->v_fs_e = res.fs_e; if ((vmp = find_vmnt(vp->v_fs_e)) == NIL_VMNT) printf("VFSclone_opcl: no vmnt found\n"); vp->v_vmnt = vmp; vp->v_dev = vmp->m_dev; vp->v_inode_nr = res.inode_nr; vp->v_mode = res.fmode; vp->v_sdev = dev; vp->v_count = 1; fp->fp_filp[m_in.fd]->filp_vno = vp; } dev_mess.REP_STATUS = OK; } return(dev_mess.REP_STATUS); } /*===========================================================================* * dev_up * *===========================================================================*/ PUBLIC void dev_up(int maj) { /* A new device driver has been mapped in. This function * checks if any filesystems are mounted on it, and if so, * dev_open()s them so the filesystem can be reused. */ struct filp *fp; struct vmnt *vmp; int r, new_driver_e; message m; /* Open a device once for every filp that's opened on it, * and once for every filesystem mounted from it. */ new_driver_e = dmap[maj].dmap_driver; for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp) { int minor; if (vmp->m_dev == NO_DEV) continue; if ( ((vmp->m_dev >> MAJOR) & BYTE) != maj) continue; minor = ((vmp->m_dev >> MINOR) & BYTE); printf("VFS: re-opening dev: %d/%d\n", maj, minor); if ((r = dev_open(vmp->m_dev, FS_PROC_NR, vmp->m_flags ? R_BIT : (R_BIT|W_BIT))) != OK) { printf("VFS: mounted dev %d/%d re-open failed: %d.\n", maj, minor, r); } /* Send new driver endpoint */ printf("VFS: sending new dirver for dev: %d, endpoint: %d, FS_e: %d\n", vmp->m_dev, new_driver_e, vmp->m_fs_e); if (OK != req_newdriver(vmp->m_fs_e, vmp->m_dev, new_driver_e)) printf("VFSdev_up: error sending new driver endpoint. FS_e: %d req_nr: %d\n", vmp->m_fs_e, REQ_NEW_DRIVER); else vmp->m_driver_e = new_driver_e; } for (fp = filp; fp < &filp[NR_FILPS]; fp++) { struct vnode *vp; int minor; if(fp->filp_count < 1 || !(vp = fp->filp_vno)) continue; if(((vp->v_sdev >> MAJOR) & BYTE) != maj) continue; if(!(vp->v_mode & (I_BLOCK_SPECIAL|I_CHAR_SPECIAL))) continue; minor = ((vp->v_sdev >> MINOR) & BYTE); printf("VFS: reopening special %d/%d..\n", maj, minor); if((r = dev_open(vp->v_sdev, FS_PROC_NR, vp->v_mode & (R_BIT|W_BIT))) != OK) { int n; /* This function will set the fp_filp[]s of processes * holding that fp to NULL, but _not_ clear * fp_filp_inuse, so that fd can't be recycled until * it's close()d. */ n = inval_filp(fp); if(n != fp->filp_count) printf("VFS: warning: invalidate/count " "discrepancy (%d, %d)\n", n, fp->filp_count); fp->filp_count = 0; printf("VFS: file on dev %d/%d re-open failed: %d; " "invalidated %d fd's.\n", maj, minor, r, n); } } return; }