8f55767619
By making m_in job local (i.e., each job has its own copy of m_in instead of refering to the global m_in) we don't have to store and restore m_in on every thread yield. This reduces overhead. Moreover, remove the assumption that m_in is preserved. Do_XXX functions have to copy the system call parameters as soon as possible and only pass those copies to other functions. Furthermore, this patch cleans up some code and uses better types in a lot of places.
342 lines
9.2 KiB
C
342 lines
9.2 KiB
C
/* This file contains the code for performing four system calls relating to
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* status and directories.
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*
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* The entry points into this file are
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* do_chdir: perform the CHDIR system call
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* do_chroot: perform the CHROOT system call
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* do_lstat: perform the LSTAT system call
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* do_stat: perform the STAT system call
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* do_fstat: perform the FSTAT system call
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* do_fstatfs: perform the FSTATFS system call
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* do_statvfs: perform the STATVFS system call
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* do_fstatvfs: perform the FSTATVFS system call
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*/
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#include "fs.h"
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <minix/com.h>
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#include <minix/u64.h>
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#include <string.h>
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#include "file.h"
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#include "fproc.h"
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#include "path.h"
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#include "param.h"
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#include <minix/vfsif.h>
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#include <minix/callnr.h>
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#include "vnode.h"
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#include "vmnt.h"
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static int change_into(struct vnode **iip, struct vnode *vp);
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/*===========================================================================*
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* do_fchdir *
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*===========================================================================*/
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int do_fchdir()
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{
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/* Change directory on already-opened fd. */
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struct filp *rfilp;
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int r, rfd;
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rfd = job_m_in.fd;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = change_into(&fp->fp_wd, rfilp->filp_vno);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_chdir *
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*===========================================================================*/
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int do_chdir()
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{
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/* Perform the chdir(name) system call.
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* syscall might provide 'name' embedded in the message.
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*/
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname;
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size_t vname_length;
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vname = (vir_bytes) job_m_in.name;
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vname_length = (size_t) job_m_in.name_length;
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if (copy_name(vname_length, fullpath) != OK) {
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/* Direct copy failed, try fetching from user space */
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if (fetch_name(vname, vname_length, fullpath) != OK)
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return(err_code);
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}
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/* Try to open the directory */
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = change_into(&fp->fp_wd, vp);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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/*===========================================================================*
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* do_chroot *
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*===========================================================================*/
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int do_chroot()
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{
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/* Perform the chroot(name) system call.
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* syscall might provide 'name' embedded in the message.
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*/
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname;
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size_t vname_length;
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vname = (vir_bytes) job_m_in.name;
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vname_length = (size_t) job_m_in.name_length;
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if (!super_user) return(EPERM); /* only su may chroot() */
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if (copy_name(vname_length, fullpath) != OK) {
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/* Direct copy failed, try fetching from user space */
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if (fetch_name(vname, vname_length, fullpath) != OK)
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return(err_code);
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}
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/* Try to open the directory */
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = change_into(&fp->fp_rd, vp);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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/*===========================================================================*
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* change_into *
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*===========================================================================*/
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static int change_into(struct vnode **result, struct vnode *vp)
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{
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int r;
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if (*result == vp) return(OK); /* Nothing to do */
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/* It must be a directory and also be searchable */
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if ((vp->v_mode & I_TYPE) != I_DIRECTORY)
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r = ENOTDIR;
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else
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r = forbidden(fp, vp, X_BIT); /* Check if dir is searchable*/
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if (r != OK) return(r);
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/* Everything is OK. Make the change. */
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put_vnode(*result); /* release the old directory */
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dup_vnode(vp);
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*result = vp; /* acquire the new one */
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return(OK);
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}
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/*===========================================================================*
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* do_stat *
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*===========================================================================*/
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int do_stat()
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{
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/* Perform the stat(name, buf) system call. */
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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int old_stat = 0;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = (vir_bytes) job_m_in.name1;
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vname1_length = (size_t) job_m_in.name1_length;
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statbuf = (vir_bytes) job_m_in.m1_p2;
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (job_call_nr == PREV_STAT)
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old_stat = 1;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, statbuf, 0, old_stat);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return r;
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}
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/*===========================================================================*
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* do_fstat *
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*===========================================================================*/
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int do_fstat()
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{
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/* Perform the fstat(fd, buf) system call. */
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register struct filp *rfilp;
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int r, pipe_pos = 0, old_stat = 0, rfd;
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vir_bytes statbuf;
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statbuf = (vir_bytes) job_m_in.buffer;
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rfd = job_m_in.fd;
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if (job_call_nr == PREV_FSTAT)
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old_stat = 1;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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/* If we read from a pipe, send position too */
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if (rfilp->filp_vno->v_pipe == I_PIPE) {
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if (rfilp->filp_mode & R_BIT)
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if (ex64hi(rfilp->filp_pos) != 0) {
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panic("do_fstat: bad position in pipe");
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}
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pipe_pos = ex64lo(rfilp->filp_pos);
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}
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r = req_stat(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr,
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who_e, statbuf, pipe_pos, old_stat);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_fstatfs *
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*===========================================================================*/
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int do_fstatfs()
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{
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/* Perform the fstatfs(fd, buf) system call. */
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struct filp *rfilp;
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int r, rfd;
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vir_bytes statbuf;
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rfd = job_m_in.fd;
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statbuf = (vir_bytes) job_m_in.buffer;
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/* Is the file descriptor valid? */
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if( (rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = req_fstatfs(rfilp->filp_vno->v_fs_e, who_e, statbuf);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_statvfs *
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*===========================================================================*/
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int do_statvfs()
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{
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/* Perform the stat(name, buf) system call. */
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = (vir_bytes) job_m_in.name1;
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vname1_length = (size_t) job_m_in.name1_length;
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statbuf = (vir_bytes) job_m_in.name2;
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_statvfs(vp->v_fs_e, who_e, statbuf);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return r;
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}
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/*===========================================================================*
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* do_fstatvfs *
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*===========================================================================*/
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int do_fstatvfs()
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{
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/* Perform the fstat(fd, buf) system call. */
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register struct filp *rfilp;
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int r, rfd;
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vir_bytes statbuf;
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rfd = job_m_in.fd;
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statbuf = (vir_bytes) job_m_in.name2;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = req_statvfs(rfilp->filp_vno->v_fs_e, who_e, statbuf);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_lstat *
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*===========================================================================*/
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int do_lstat()
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{
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/* Perform the lstat(name, buf) system call. */
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struct vnode *vp;
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struct vmnt *vmp;
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int r;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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int old_stat = 0;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = (vir_bytes) job_m_in.name1;
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vname1_length = (size_t) job_m_in.name1_length;
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statbuf = (vir_bytes) job_m_in.name2;
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lookup_init(&resolve, fullpath, PATH_RET_SYMLINK, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (job_call_nr == PREV_LSTAT)
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old_stat = 1;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, statbuf, 0, old_stat);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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