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author | jhb <jhb@FreeBSD.org> | 2008-01-07 20:05:19 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2008-01-07 20:05:19 +0000 |
commit | f8a246b9791d1450cf4945cc7b38f651a3a456ee (patch) | |
tree | 4cf9280569e048ce55d457d60918586c5cf023e5 /sys/fs/devfs/devfs_vnops.c | |
parent | 1b130ab3271ae64d5c2979889a661e27bbe422d9 (diff) | |
download | FreeBSD-src-f8a246b9791d1450cf4945cc7b38f651a3a456ee.zip FreeBSD-src-f8a246b9791d1450cf4945cc7b38f651a3a456ee.tar.gz |
Make ftruncate a 'struct file' operation rather than a vnode operation.
This makes it possible to support ftruncate() on non-vnode file types in
the future.
- 'struct fileops' grows a 'fo_truncate' method to handle an ftruncate() on
a given file descriptor.
- ftruncate() moves to kern/sys_generic.c and now just fetches a file
object and invokes fo_truncate().
- The vnode-specific portions of ftruncate() move to vn_truncate() in
vfs_vnops.c which implements fo_truncate() for vnode file types.
- Non-vnode file types return EINVAL in their fo_truncate() method.
Submitted by: rwatson
Diffstat (limited to 'sys/fs/devfs/devfs_vnops.c')
-rw-r--r-- | sys/fs/devfs/devfs_vnops.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c index 269f2c3..7c753f1 100644 --- a/sys/fs/devfs/devfs_vnops.c +++ b/sys/fs/devfs/devfs_vnops.c @@ -1278,6 +1278,13 @@ devfs_symlink(struct vop_symlink_args *ap) return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td)); } +static int +devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) +{ + + return (vnops.fo_truncate(fp, length, cred, td)); +} + /* ARGSUSED */ static int devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) @@ -1322,6 +1329,7 @@ dev2udev(struct cdev *x) static struct fileops devfs_ops_f = { .fo_read = devfs_read_f, .fo_write = devfs_write_f, + .fo_truncate = devfs_truncate_f, .fo_ioctl = devfs_ioctl_f, .fo_poll = devfs_poll_f, .fo_kqfilter = devfs_kqfilter_f, |