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Update the vnode's access time after an mmap operation on it.

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Before this change a copy operation with cp(1) would not update the
file access times.

According to the POSIX mmap(2) documentation: the st_atime field
of the mapped file may be marked for update at any time between the
mmap() call and the corresponding munmap() call. The initial read
or write reference to a mapped region shall cause the file's st_atime
field to be marked for update if it has not already been marked for
update.
This commit is contained in:
Diomidis Spinellis 2005-10-04 14:58:58 +00:00
parent 86c5d92d71
commit 1e3090039d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=150926
1 changed files with 12 additions and 0 deletions
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12
sys/vm/vm_mmap.c
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@ -1164,6 +1164,18 @@ vm_mmap_vnode(struct thread *td, vm_size_t objsize,
}
*objp = obj;
*flagsp = flags;
/* Update access time. */
if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) {
struct vattr vattr;
struct timespec ts;
VATTR_NULL(&vattr);
vfs_timestamp(&ts);
vattr.va_atime = ts;
(void)VOP_SETATTR(vp, &vattr, td->td_ucred, td);
}
done:
vput(vp);
VFS_UNLOCK_GIANT(vfslocked);