89a4204b83
All functions prefixed with bdev_ are moved into bdev.c, and those prefixed with cdev_ are now in cdev.c. The code in both files are converted to KNF. The little (IOCTL-related) code left in device.c is also cleaned up but should probably be moved into other existing source files. This is left to a future patch. In general, VFS is long overdue for a source code rebalancing, and the patch here is only a step in the right direction. Change-Id: I2fb25734b5778b44f2ff6d2ce331a8e2146e20b0
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
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* This file contains a number of device-type independent device routines.
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*
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* The entry points in this file are:
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* do_ioctl: perform the IOCTL system call
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* make_ioctl_grant: make a grant for an IOCTL request to a device
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*/
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#include "fs.h"
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#include "vnode.h"
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#include "file.h"
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#include <sys/ioctl.h>
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/*
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* Perform the ioctl(2) system call.
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*/
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int
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do_ioctl(void)
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{
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unsigned long request;
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struct filp *f;
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register struct vnode *vp;
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vir_bytes arg;
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int r, fd;
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fd = job_m_in.m_lc_vfs_ioctl.fd;
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request = job_m_in.m_lc_vfs_ioctl.req;
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arg = (vir_bytes)job_m_in.m_lc_vfs_ioctl.arg;
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if ((f = get_filp(fd, VNODE_READ)) == NULL)
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return(err_code);
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vp = f->filp_vno; /* get vnode pointer */
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switch (vp->v_mode & S_IFMT) {
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case S_IFBLK:
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f->filp_ioctl_fp = fp;
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r = bdev_ioctl(vp->v_sdev, who_e, request, arg);
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f->filp_ioctl_fp = NULL;
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break;
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case S_IFCHR:
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r = cdev_io(CDEV_IOCTL, vp->v_sdev, who_e, arg, 0, request,
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f->filp_flags);
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break;
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default:
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r = ENOTTY;
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}
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unlock_filp(f);
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return r;
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}
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/*
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* Create a magic grant for the given IOCTL request.
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*/
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cp_grant_id_t
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make_ioctl_grant(endpoint_t driver_e, endpoint_t user_e, vir_bytes buf,
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unsigned long request)
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{
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cp_grant_id_t grant;
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int access;
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size_t size;
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/*
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* For IOCTLs, the bytes parameter contains the IOCTL request.
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* This request encodes the requested access method and buffer size.
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*/
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access = 0;
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if (_MINIX_IOCTL_IOR(request)) access |= CPF_WRITE;
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if (_MINIX_IOCTL_IOW(request)) access |= CPF_READ;
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if (_MINIX_IOCTL_BIG(request))
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size = _MINIX_IOCTL_SIZE_BIG(request);
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else
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size = _MINIX_IOCTL_SIZE(request);
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/*
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* Grant access to the buffer even if no I/O happens with the ioctl,
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* although now that we no longer identify responses based on grants,
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* this is not strictly necessary.
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*/
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grant = cpf_grant_magic(driver_e, user_e, buf, size, access);
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if (!GRANT_VALID(grant))
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panic("VFS: cpf_grant_magic failed");
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return grant;
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}
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