606 lines
18 KiB
C
606 lines
18 KiB
C
/* This file contains the procedures for creating, opening, closing, and
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* seeking on files.
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*
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* The entry points into this file are
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* do_creat: perform the CREAT system call
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* do_open: perform the OPEN system call
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* do_mknod: perform the MKNOD system call
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* do_mkdir: perform the MKDIR system call
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* do_close: perform the CLOSE system call
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* do_lseek: perform the LSEEK 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 <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/u64.h>
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#include "file.h"
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#include "fproc.h"
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#include "lock.h"
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#include "param.h"
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#include <dirent.h>
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#include <assert.h>
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#include <minix/vfsif.h>
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#include "vnode.h"
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#include "vmnt.h"
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PRIVATE char mode_map[] = {R_BIT, W_BIT, R_BIT|W_BIT, 0};
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FORWARD _PROTOTYPE( struct vnode *new_node, (int oflags, mode_t bits) );
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FORWARD _PROTOTYPE( int pipe_open, (struct vnode *vp,mode_t bits,int oflags));
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/*===========================================================================*
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* do_creat *
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*===========================================================================*/
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PUBLIC int do_creat()
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{
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/* Perform the creat(name, mode) system call. */
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int r;
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if (fetch_name(m_in.name, m_in.name_length, M3) != OK) return(err_code);
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r = common_open(O_WRONLY | O_CREAT | O_TRUNC, (mode_t) m_in.mode);
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return(r);
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}
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/*===========================================================================*
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* do_open *
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*===========================================================================*/
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PUBLIC int do_open()
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{
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/* Perform the open(name, flags,...) system call. */
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int create_mode = 0; /* is really mode_t but this gives problems */
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int r;
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/* If O_CREAT is set, open has three parameters, otherwise two. */
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if (m_in.mode & O_CREAT) {
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create_mode = m_in.c_mode;
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r = fetch_name(m_in.c_name, m_in.name1_length, M1);
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} else {
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r = fetch_name(m_in.name, m_in.name_length, M3);
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}
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if (r != OK) return(err_code); /* name was bad */
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r = common_open(m_in.mode, create_mode);
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return(r);
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}
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/*===========================================================================*
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* common_open *
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*===========================================================================*/
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PUBLIC int common_open(register int oflags, mode_t omode)
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{
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/* Common code from do_creat and do_open. */
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int b, r, exist = TRUE;
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dev_t dev;
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mode_t bits;
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struct filp *fil_ptr, *filp2;
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struct vnode *vp;
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struct vmnt *vmp;
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struct dmap *dp;
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/* Remap the bottom two bits of oflags. */
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bits = (mode_t) mode_map[oflags & O_ACCMODE];
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if (!bits) return(EINVAL);
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/* See if file descriptor and filp slots are available. */
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if ((r = get_fd(0, bits, &m_in.fd, &fil_ptr)) != OK) return(r);
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/* If O_CREATE is set, try to make the file. */
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if (oflags & O_CREAT) {
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omode = I_REGULAR | (omode & ALL_MODES & fp->fp_umask);
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vp = new_node(oflags, omode);
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r = err_code;
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if (r == OK) exist = FALSE; /* We just created the file */
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else if (r != EEXIST) return(r); /* other error */
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else exist = !(oflags & O_EXCL); /* file exists, if the O_EXCL
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flag is set this is an error */
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} else {
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/* Scan path name */
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if ((vp = eat_path(PATH_NOFLAGS, fp)) == NULL) return(err_code);
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}
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/* Claim the file descriptor and filp slot and fill them in. */
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fp->fp_filp[m_in.fd] = fil_ptr;
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FD_SET(m_in.fd, &fp->fp_filp_inuse);
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fil_ptr->filp_count = 1;
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fil_ptr->filp_vno = vp;
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fil_ptr->filp_flags = oflags;
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/* Only do the normal open code if we didn't just create the file. */
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if(exist) {
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/* Check protections. */
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if ((r = forbidden(vp, bits)) == OK) {
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/* Opening reg. files, directories, and special files differ */
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switch (vp->v_mode & I_TYPE) {
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case I_REGULAR:
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/* Truncate regular file if O_TRUNC. */
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if (oflags & O_TRUNC) {
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if ((r = forbidden(vp, W_BIT)) != OK)
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break;
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truncate_vnode(vp, 0);
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}
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break;
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case I_DIRECTORY:
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/* Directories may be read but not written. */
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r = (bits & W_BIT ? EISDIR : OK);
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break;
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case I_CHAR_SPECIAL:
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/* Invoke the driver for special processing. */
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dev = (dev_t) vp->v_sdev;
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r = dev_open(dev, who_e, bits | (oflags & ~O_ACCMODE));
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if (r == SUSPEND) suspend(FP_BLOCKED_ON_DOPEN);
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break;
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case I_BLOCK_SPECIAL:
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/* Invoke the driver for special processing. */
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dev = (dev_t) vp->v_sdev;
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r = dev_open(dev, who_e, bits | (oflags & ~O_ACCMODE));
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if (r != OK) break;
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/* Check whether the device is mounted or not. If so,
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then that FS is responsible for this device. Else
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we default to ROOT_FS. */
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vp->v_bfs_e = ROOT_FS_E; /* By default */
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for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp)
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if (vmp->m_dev == vp->v_sdev)
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vp->v_bfs_e = vmp->m_fs_e;
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/* Get the driver endpoint of the block spec device */
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dp = &dmap[(vp->v_sdev >> MAJOR) & BYTE];
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if (dp->dmap_driver == NONE) {
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printf("VFS: driver not found for device %d\n",
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vp->v_sdev);
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r = ENXIO;
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break;
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}
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/* Send the driver endpoint (even when known already)*/
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if ((r = req_newdriver(vp->v_bfs_e, vp->v_sdev,
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dp->dmap_driver)) != OK) {
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printf("VFS: error sending driver endpoint\n");
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r = ENXIO;
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}
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break;
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case I_NAMED_PIPE:
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/* Create a mapped inode on PFS which handles reads
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and writes to this named pipe. */
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r = map_vnode(vp);
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if (r == OK) {
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vp->v_pipe = I_PIPE;
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if (vp->v_ref_count == 1) {
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vp->v_pipe_rd_pos = 0;
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vp->v_pipe_wr_pos = 0;
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if (vp->v_size != 0)
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r = truncate_vnode(vp, 0);
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}
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oflags |= O_APPEND; /* force append mode */
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fil_ptr->filp_flags = oflags;
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}
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if (r == OK) {
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r = pipe_open(vp, bits, oflags);
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}
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if (r != ENXIO) {
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/* See if someone else is doing a rd or wt on
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* the FIFO. If so, use its filp entry so the
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* file position will be automatically shared.
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*/
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b = (bits & R_BIT ? R_BIT : W_BIT);
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fil_ptr->filp_count = 0; /* don't find self */
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if ((filp2 = find_filp(vp, b)) != NULL) {
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/* Co-reader or writer found. Use it.*/
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fp->fp_filp[m_in.fd] = filp2;
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filp2->filp_count++;
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filp2->filp_vno = vp;
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filp2->filp_flags = oflags;
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/* v_count was incremented after the
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* vnode has been found. i_count was
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* incremented incorrectly in FS, not
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* knowing that we were going to use an
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* existing filp entry. Correct this
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* error.
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*/
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put_vnode(vp);
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} else {
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/* Nobody else found. Restore filp. */
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fil_ptr->filp_count = 1;
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}
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}
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break;
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}
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}
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}
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/* If error, release inode. */
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if (r != OK) {
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if (r == SUSPEND) return(r); /* Oops, just suspended */
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fp->fp_filp[m_in.fd] = NULL;
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FD_CLR(m_in.fd, &fp->fp_filp_inuse);
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fil_ptr->filp_count= 0;
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put_vnode(vp);
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fil_ptr->filp_vno = NULL;
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return(r);
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}
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return(m_in.fd);
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}
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/*===========================================================================*
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* new_node *
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*===========================================================================*/
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PRIVATE struct vnode *new_node(int oflags, mode_t bits)
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{
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/* Try to create a new inode and return a pointer to it. If the inode already
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exists, return a pointer to it as well, but set err_code accordingly.
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NULL is returned if the path cannot be resolved up to the last
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directory, or when the inode cannot be created due to permissions or
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otherwise. */
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struct vnode *dirp, *vp;
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int r, flags;
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struct node_details res;
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/* When O_CREAT and O_EXCL flags are set, the path may not be named by a
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* symbolic link. */
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flags = PATH_NOFLAGS;
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if (oflags & O_EXCL) flags |= PATH_RET_SYMLINK;
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/* See if the path can be opened down to the last directory. */
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if ((dirp = last_dir(fp)) == NULL) return(NULL);
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/* The final directory is accessible. Get final component of the path. */
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vp = advance(dirp, flags, fp);
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/* The combination of a symlink with absolute path followed by a danglink
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* symlink results in a new path that needs to be re-resolved entirely. */
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if (user_fullpath[0] == '/') return new_node(oflags, bits);
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if (vp == NULL && err_code == ENOENT) {
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/* Last path component does not exist. Make a new directory entry. */
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if ((vp = get_free_vnode()) == NULL) {
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/* Can't create new vnode: out of vnodes. */
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put_vnode(dirp);
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return(NULL);
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}
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if ((r = forbidden(dirp, W_BIT|X_BIT)) != OK ||
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(r = req_create(dirp->v_fs_e, dirp->v_inode_nr,bits, fp->fp_effuid,
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fp->fp_effgid, user_fullpath, &res)) != OK ) {
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/* Can't create inode either due to permissions or some other
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* problem. In case r is EEXIST, we might be dealing with a
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* dangling symlink.*/
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if (r == EEXIST) {
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struct vnode *slp, *old_wd;
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/* Resolve path up to symlink */
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slp = advance(dirp, PATH_RET_SYMLINK, fp);
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if (slp != NULL) {
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if (S_ISLNK(slp->v_mode)) {
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/* Get contents of link */
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int max_linklen;
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max_linklen = sizeof(user_fullpath)-1;
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r = req_rdlink(slp->v_fs_e,
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slp->v_inode_nr,
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VFS_PROC_NR,
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user_fullpath,
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max_linklen, 0);
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if (r < 0) {
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/* Failed to read link */
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put_vnode(slp);
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put_vnode(dirp);
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err_code = r;
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return(NULL);
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}
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user_fullpath[r] = '\0';/* Term. path*/
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}
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put_vnode(slp);
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}
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/* Try to create the inode the dangling symlink was
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* pointing to. We have to use dirp as starting point
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* as there might be multiple successive symlinks
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* crossing multiple mountpoints. */
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old_wd = fp->fp_wd; /* Save orig. working dirp */
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fp->fp_wd = dirp;
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vp = new_node(oflags, bits);
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fp->fp_wd = old_wd; /* Restore */
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if (vp != NULL) {
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put_vnode(dirp);
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return(vp);
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}
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r = err_code;
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}
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if (r == EEXIST)
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err_code = EIO; /* Impossible, we have verified that
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* the last component doesn't exist and
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* is not a dangling symlink. */
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else
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err_code = r;
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put_vnode(dirp);
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return(NULL);
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}
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/* Store results and mark vnode in use */
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vp->v_fs_e = res.fs_e;
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vp->v_inode_nr = res.inode_nr;
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vp->v_mode = res.fmode;
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vp->v_size = res.fsize;
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vp->v_uid = res.uid;
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vp->v_gid = res.gid;
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vp->v_sdev = res.dev;
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vp->v_vmnt = dirp->v_vmnt;
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vp->v_dev = vp->v_vmnt->m_dev;
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vp->v_fs_count = 1;
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vp->v_ref_count = 1;
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} else {
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/* Either last component exists, or there is some other problem. */
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if (vp != NULL)
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r = EEXIST; /* File exists or a symlink names a file while
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* O_EXCL is set. */
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else
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r = err_code; /* Other problem. */
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}
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err_code = r;
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put_vnode(dirp);
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return(vp);
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}
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/*===========================================================================*
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* pipe_open *
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*===========================================================================*/
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PRIVATE int pipe_open(register struct vnode *vp, register mode_t bits,
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register int oflags)
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{
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/* This function is called from common_open. It checks if
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* there is at least one reader/writer pair for the pipe, if not
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* it suspends the caller, otherwise it revives all other blocked
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* processes hanging on the pipe.
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*/
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vp->v_pipe = I_PIPE;
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if((bits & (R_BIT|W_BIT)) == (R_BIT|W_BIT)) return(ENXIO);
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if (find_filp(vp, bits & W_BIT ? R_BIT : W_BIT) == NULL) {
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if (oflags & O_NONBLOCK) {
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if (bits & W_BIT) return(ENXIO);
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} else {
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suspend(FP_BLOCKED_ON_POPEN); /* suspend caller */
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return(SUSPEND);
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}
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} else if (susp_count > 0) { /* revive blocked processes */
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release(vp, OPEN, susp_count);
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release(vp, CREAT, susp_count);
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}
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return(OK);
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}
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/*===========================================================================*
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* do_mknod *
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*===========================================================================*/
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PUBLIC int do_mknod()
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{
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/* Perform the mknod(name, mode, addr) system call. */
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register mode_t bits, mode_bits;
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int r;
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struct vnode *vp;
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/* Only the super_user may make nodes other than fifos. */
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mode_bits = (mode_t) m_in.mk_mode; /* mode of the inode */
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if(!super_user && (((mode_bits & I_TYPE) != I_NAMED_PIPE) && ((mode_bits & I_TYPE) != I_UNIX_SOCKET))) return(EPERM);
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bits = (mode_bits & I_TYPE) | (mode_bits & ALL_MODES & fp->fp_umask);
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/* Open directory that's going to hold the new node. */
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if(fetch_name(m_in.name1, m_in.name1_length, M1) != OK) return(err_code);
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if((vp = last_dir(fp)) == NULL) return(err_code);
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/* Make sure that the object is a directory */
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if((vp->v_mode & I_TYPE) != I_DIRECTORY) {
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put_vnode(vp);
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return(ENOTDIR);
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}
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if ((r = forbidden(vp, W_BIT|X_BIT)) == OK) {
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r = req_mknod(vp->v_fs_e, vp->v_inode_nr, user_fullpath, fp->fp_effuid,
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fp->fp_effgid, bits, m_in.mk_z0);
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}
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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_mkdir *
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*===========================================================================*/
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PUBLIC int do_mkdir()
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{
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/* Perform the mkdir(name, mode) system call. */
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mode_t bits; /* mode bits for the new inode */
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int r;
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struct vnode *vp;
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if(fetch_name(m_in.name1, m_in.name1_length, M1) != OK) return(err_code);
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bits = I_DIRECTORY | (m_in.mode & RWX_MODES & fp->fp_umask);
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/* Request lookup */
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if((vp = last_dir(fp)) == NULL) return(err_code);
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/* Make sure that the object is a directory */
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if ((vp->v_mode & I_TYPE) != I_DIRECTORY) {
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put_vnode(vp);
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return(ENOTDIR);
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}
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if ((r = forbidden(vp, W_BIT|X_BIT)) == OK) {
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r = req_mkdir(vp->v_fs_e, vp->v_inode_nr, user_fullpath, fp->fp_effuid,
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fp->fp_effgid, bits);
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}
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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_lseek *
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*===========================================================================*/
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PUBLIC int do_lseek()
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{
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/* Perform the lseek(ls_fd, offset, whence) system call. */
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register struct filp *rfilp;
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int r;
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long offset;
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u64_t pos, newpos;
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/* Check to see if the file descriptor is valid. */
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if ( (rfilp = get_filp(m_in.ls_fd)) == NULL) return(err_code);
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/* No lseek on pipes. */
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if (rfilp->filp_vno->v_pipe == I_PIPE) return(ESPIPE);
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/* The value of 'whence' determines the start position to use. */
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switch(m_in.whence) {
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case SEEK_SET: pos = cvu64(0); break;
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case SEEK_CUR: pos = rfilp->filp_pos; break;
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case SEEK_END: pos = cvul64(rfilp->filp_vno->v_size); break;
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default: return(EINVAL);
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}
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offset = m_in.offset_lo;
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if (offset >= 0)
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newpos= add64ul(pos, offset);
|
|
else
|
|
newpos= sub64ul(pos, -offset);
|
|
|
|
/* Check for overflow. */
|
|
if (ex64hi(newpos) != 0)
|
|
return(EINVAL);
|
|
|
|
if (cmp64(newpos, rfilp->filp_pos) != 0) { /* Inhibit read ahead request */
|
|
r = req_inhibread(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr);
|
|
if (r != OK) return(r);
|
|
}
|
|
|
|
rfilp->filp_pos = newpos;
|
|
|
|
/* insert the new position into the output message */
|
|
m_out.reply_l1 = ex64lo(newpos);
|
|
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_llseek *
|
|
*===========================================================================*/
|
|
PUBLIC int do_llseek()
|
|
{
|
|
/* Perform the llseek(ls_fd, offset, whence) system call. */
|
|
register struct filp *rfilp;
|
|
u64_t pos, newpos;
|
|
int r;
|
|
|
|
/* Check to see if the file descriptor is valid. */
|
|
if ( (rfilp = get_filp(m_in.ls_fd)) == NULL) return(err_code);
|
|
|
|
/* No lseek on pipes. */
|
|
if (rfilp->filp_vno->v_pipe == I_PIPE) return(ESPIPE);
|
|
|
|
/* The value of 'whence' determines the start position to use. */
|
|
switch(m_in.whence) {
|
|
case SEEK_SET: pos = cvu64(0); break;
|
|
case SEEK_CUR: pos = rfilp->filp_pos; break;
|
|
case SEEK_END: pos = cvul64(rfilp->filp_vno->v_size); break;
|
|
default: return(EINVAL);
|
|
}
|
|
|
|
newpos = add64(pos, make64(m_in.offset_lo, m_in.offset_high));
|
|
|
|
/* Check for overflow. */
|
|
if (((long)m_in.offset_high > 0) && cmp64(newpos, pos) < 0)
|
|
return(EINVAL);
|
|
if (((long)m_in.offset_high < 0) && cmp64(newpos, pos) > 0)
|
|
return(EINVAL);
|
|
|
|
if (cmp64(newpos, rfilp->filp_pos) != 0) { /* Inhibit read ahead request */
|
|
r = req_inhibread(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr);
|
|
if (r != OK) return(r);
|
|
}
|
|
|
|
rfilp->filp_pos = newpos;
|
|
m_out.reply_l1 = ex64lo(newpos);
|
|
m_out.reply_l2 = ex64hi(newpos);
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_close *
|
|
*===========================================================================*/
|
|
PUBLIC int do_close()
|
|
{
|
|
/* Perform the close(fd) system call. */
|
|
return close_fd(fp, m_in.fd);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* close_fd *
|
|
*===========================================================================*/
|
|
PUBLIC int close_fd(rfp, fd_nr)
|
|
struct fproc *rfp;
|
|
int fd_nr;
|
|
{
|
|
/* Perform the close(fd) system call. */
|
|
register struct filp *rfilp;
|
|
register struct vnode *vp;
|
|
struct file_lock *flp;
|
|
int lock_count;
|
|
|
|
/* First locate the vnode that belongs to the file descriptor. */
|
|
if ( (rfilp = get_filp2(rfp, fd_nr)) == NULL) return(err_code);
|
|
vp = rfilp->filp_vno;
|
|
close_filp(rfilp);
|
|
|
|
FD_CLR(fd_nr, &rfp->fp_cloexec_set);
|
|
rfp->fp_filp[fd_nr] = NULL;
|
|
FD_CLR(fd_nr, &rfp->fp_filp_inuse);
|
|
|
|
/* Check to see if the file is locked. If so, release all locks. */
|
|
if (nr_locks == 0) return(OK);
|
|
lock_count = nr_locks; /* save count of locks */
|
|
for (flp = &file_lock[0]; flp < &file_lock[NR_LOCKS]; flp++) {
|
|
if (flp->lock_type == 0) continue; /* slot not in use */
|
|
if (flp->lock_vnode == vp && flp->lock_pid == rfp->fp_pid) {
|
|
flp->lock_type = 0;
|
|
nr_locks--;
|
|
}
|
|
}
|
|
if (nr_locks < lock_count) lock_revive(); /* lock released */
|
|
return(OK);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* close_reply *
|
|
*===========================================================================*/
|
|
PUBLIC void close_reply()
|
|
{
|
|
/* No need to do anything */
|
|
}
|
|
|