1 #include "fs.h" 2 #include "inode.h" 3 #include <sys/stat.h> 4 #include <minix/vfsif.h> 5 6 7 /*===========================================================================* 8 * fs_utime * 9 *===========================================================================*/ 10 int fs_utime() 11 { 12 register struct inode *rip; 13 register int r; 14 15 /* Temporarily open the file. */ 16 if( (rip = get_inode(fs_dev, fs_m_in.m_vfs_fs_utime.inode)) == NULL) 17 return(EINVAL); 18 19 /* 20 * Only the owner of a file or the super_user can change the timestamps. 21 * Here we assume VFS did that check before. 22 */ 23 24 r = OK; 25 if(read_only(rip) != OK) r = EROFS; /* not even su can touch if R/O */ 26 if(r == OK) { 27 rip->i_update = CTIME; /* discard any stale ATIME and MTIME flags */ 28 switch(fs_m_in.m_vfs_fs_utime.acnsec) { 29 case UTIME_NOW: 30 rip->i_update |= ATIME; 31 break; 32 case UTIME_OMIT: /* do not touch */ 33 break; 34 default: 35 /* 36 * cases fs_m_in.m_vfs_fs_utime.acnsec < 0 || fs_m_in.m_vfs_fs_utime.acnsec >= 1E9 37 * are caught by VFS to cooperate with old instances of MFS 38 */ 39 rip->i_atime = fs_m_in.m_vfs_fs_utime.actime; 40 /* 41 * MFS does not support better than second resolution, 42 * so we discard ACNSEC to round down 43 */ 44 break; 45 } 46 47 switch(fs_m_in.m_vfs_fs_utime.modnsec) { 48 case UTIME_NOW: 49 rip->i_update |= MTIME; 50 break; 51 case UTIME_OMIT: /* do not touch */ 52 break; 53 default: 54 /* 55 * cases fs_m_in.m_vfs_fs_utime.modnsec < 0 || fs_m_in.m_vfs_fs_utime.modnsec >= 1E9 56 * are caught by VFS to cooperate with old instances of MFS 57 */ 58 rip->i_mtime = fs_m_in.m_vfs_fs_utime.modtime; 59 /* 60 * MFS does not support better than second resolution, 61 * so we discard MODNSEC to round down 62 */ 63 break; 64 } 65 66 IN_MARKDIRTY(rip); 67 } 68 69 put_inode(rip); 70 return(r); 71 } 72 73