diff options
Diffstat (limited to 'sys/kern/vfs_vnops.c')
| -rw-r--r-- | sys/kern/vfs_vnops.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index 4826b08..10898e5 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -66,6 +66,7 @@ __FBSDID("$FreeBSD$"); static fo_rdwr_t vn_read; static fo_rdwr_t vn_write; +static fo_truncate_t vn_truncate; static fo_ioctl_t vn_ioctl; static fo_poll_t vn_poll; static fo_kqfilter_t vn_kqfilter; @@ -75,6 +76,7 @@ static fo_close_t vn_closefile; struct fileops vnops = { .fo_read = vn_read, .fo_write = vn_write, + .fo_truncate = vn_truncate, .fo_ioctl = vn_ioctl, .fo_poll = vn_poll, .fo_kqfilter = vn_kqfilter, @@ -607,6 +609,53 @@ unlock: } /* + * File table truncate routine. + */ +static int +vn_truncate(fp, length, active_cred, td) + struct file *fp; + off_t length; + struct ucred *active_cred; + struct thread *td; +{ + struct vattr vattr; + struct mount *mp; + struct vnode *vp; + int vfslocked; + int error; + + vp = fp->f_vnode; + vfslocked = VFS_LOCK_GIANT(vp->v_mount); + error = vn_start_write(vp, &mp, V_WAIT | PCATCH); + if (error) { + VFS_UNLOCK_GIANT(vfslocked); + return (error); + } + VOP_LEASE(vp, td, active_cred, LEASE_WRITE); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); + if (vp->v_type == VDIR) { + error = EISDIR; + goto out; + } +#ifdef MAC + error = mac_vnode_check_write(active_cred, fp->f_cred, vp); + if (error) + goto out; +#endif + error = vn_writechk(vp); + if (error == 0) { + VATTR_NULL(&vattr); + vattr.va_size = length; + error = VOP_SETATTR(vp, &vattr, fp->f_cred, td); + } +out: + VOP_UNLOCK(vp, 0, td); + vn_finished_write(mp); + VFS_UNLOCK_GIANT(vfslocked); + return (error); +} + +/* * File table vnode stat routine. */ static int |
