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.
73 lines
2 KiB
C
73 lines
2 KiB
C
/* This file takes care of those system calls that deal with time.
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*
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* The entry points into this file are
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* do_utime: perform the UTIME system call
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*/
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#include "fs.h"
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#include <minix/callnr.h>
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#include <minix/com.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 "vnode.h"
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#include <minix/vfsif.h>
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#include "vmnt.h"
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/*===========================================================================*
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* do_utime *
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*===========================================================================*/
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int do_utime()
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{
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/* Perform the utime(name, timep) system call. */
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int r;
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time_t actime, modtime, newactime, newmodtime;
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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, len;
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vname = (vir_bytes) job_m_in.utime_file;
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vname_length = (size_t) job_m_in.utime_length;
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actime = job_m_in.utime_actime;
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modtime = job_m_in.utime_modtime;
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/* Adjust for case of 'timep' being NULL;
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* utime_strlen then holds the actual size: strlen(name)+1 */
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len = vname_length;
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if (len == 0) len = (size_t) job_m_in.utime_strlen;
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_WRITE;
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resolve.l_vnode_lock = VNODE_READ;
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/* Temporarily open the file */
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if (fetch_name(vname, len, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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/* Only the owner of a file or the super user can change its name. */
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r = OK;
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if (vp->v_uid != fp->fp_effuid && fp->fp_effuid != SU_UID) r = EPERM;
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if (vname_length == 0 && r != OK) r = forbidden(fp, vp, W_BIT);
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if (read_only(vp) != OK) r = EROFS; /* Not even su can touch if R/O */
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if (r == OK) {
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/* Issue request */
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if (vname_length == 0) {
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newactime = newmodtime = clock_time();
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} else {
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newactime = actime;
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newmodtime = modtime;
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}
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r = req_utime(vp->v_fs_e, vp->v_inode_nr, newactime, newmodtime);
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}
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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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