73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
#include "fs.h"
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#include "inode.h"
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#include <sys/stat.h>
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#include <minix/vfsif.h>
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/*===========================================================================*
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* fs_utime *
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*===========================================================================*/
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int fs_utime()
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{
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register struct inode *rip;
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register int r;
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/* Temporarily open the file. */
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if( (rip = get_inode(fs_dev, fs_m_in.m_vfs_fs_utime.inode)) == NULL)
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return(EINVAL);
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/*
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* Only the owner of a file or the super_user can change the timestamps.
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* Here we assume VFS did that check before.
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*/
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r = OK;
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if(read_only(rip) != OK) r = EROFS; /* not even su can touch if R/O */
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if(r == OK) {
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rip->i_update = CTIME; /* discard any stale ATIME and MTIME flags */
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switch(fs_m_in.m_vfs_fs_utime.acnsec) {
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case UTIME_NOW:
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rip->i_update |= ATIME;
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break;
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case UTIME_OMIT: /* do not touch */
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break;
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default:
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/*
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* cases fs_m_in.m_vfs_fs_utime.acnsec < 0 || fs_m_in.m_vfs_fs_utime.acnsec >= 1E9
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* are caught by VFS to cooperate with old instances of MFS
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*/
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rip->i_atime = fs_m_in.m_vfs_fs_utime.actime;
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/*
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* MFS does not support better than second resolution,
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* so we discard ACNSEC to round down
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*/
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break;
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}
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switch(fs_m_in.m_vfs_fs_utime.modnsec) {
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case UTIME_NOW:
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rip->i_update |= MTIME;
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break;
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case UTIME_OMIT: /* do not touch */
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break;
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default:
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/*
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* cases fs_m_in.m_vfs_fs_utime.modnsec < 0 || fs_m_in.m_vfs_fs_utime.modnsec >= 1E9
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* are caught by VFS to cooperate with old instances of MFS
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*/
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rip->i_mtime = fs_m_in.m_vfs_fs_utime.modtime;
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/*
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* MFS does not support better than second resolution,
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* so we discard MODNSEC to round down
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*/
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break;
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}
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IN_MARKDIRTY(rip);
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}
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put_inode(rip);
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return(r);
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}
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