diff options
-rw-r--r-- | sys/kern/vfs_vnops.c | 53 | ||||
-rw-r--r-- | sys/sys/vnode.h | 2 |
2 files changed, 55 insertions, 0 deletions
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index d4b60f1..56c9829 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -1466,3 +1466,56 @@ vn_pages_remove(struct vnode *vp, vm_pindex_t start, vm_pindex_t end) vm_object_page_remove(object, start, end, 0); VM_OBJECT_UNLOCK(object); } + +int +vn_bmap_seekhole(struct vnode *vp, u_long cmd, off_t *off, struct ucred *cred) +{ + struct vattr va; + daddr_t bn, bnp; + uint64_t bsize; + off_t noff; + int error; + + KASSERT(cmd == FIOSEEKHOLE || cmd == FIOSEEKDATA, + ("Wrong command %lu", cmd)); + + if (vn_lock(vp, LK_SHARED) != 0) + return (EBADF); + if (vp->v_type != VREG) { + error = ENOTTY; + goto unlock; + } + error = VOP_GETATTR(vp, &va, cred); + if (error != 0) + goto unlock; + noff = *off; + if (noff >= va.va_size) { + error = ENXIO; + goto unlock; + } + bsize = vp->v_mount->mnt_stat.f_iosize; + for (bn = noff / bsize; noff < va.va_size; bn++, noff += bsize) { + error = VOP_BMAP(vp, bn, NULL, &bnp, NULL, NULL); + if (error == EOPNOTSUPP) { + error = ENOTTY; + goto unlock; + } + if ((bnp == -1 && cmd == FIOSEEKHOLE) || + (bnp != -1 && cmd == FIOSEEKDATA)) { + noff = bn * bsize; + if (noff < *off) + noff = *off; + goto unlock; + } + } + if (noff > va.va_size) + noff = va.va_size; + /* noff == va.va_size. There is an implicit hole at the end of file. */ + if (cmd == FIOSEEKDATA) + error = ENXIO; +unlock: + VOP_UNLOCK(vp, 0); + if (error == 0) + *off = noff; + return (error); +} diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h index 49f6f5b..0d711f2 100644 --- a/sys/sys/vnode.h +++ b/sys/sys/vnode.h @@ -640,6 +640,8 @@ void vunref(struct vnode *); void vn_printf(struct vnode *vp, const char *fmt, ...) __printflike(2,3); #define vprint(label, vp) vn_printf((vp), "%s\n", (label)) int vrecycle(struct vnode *vp); +int vn_bmap_seekhole(struct vnode *vp, u_long cmd, off_t *off, + struct ucred *cred); int vn_close(struct vnode *vp, int flags, struct ucred *file_cred, struct thread *td); void vn_finished_write(struct mount *mp); |