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Index: lib/libc/sys/fspacectl.2
===================================================================
--- lib/libc/sys/fspacectl.2
+++ lib/libc/sys/fspacectl.2
@@ -27,7 +27,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd August 4, 2021
+.Dd August 18, 2021
.Dt FSPACECTL 2
.Os
.Sh NAME
@@ -67,6 +67,17 @@
.Fa spacectl_range
structure it points to is updated to contain the unprocessed operation range
after the system call returns.
+.Pp
+For a successful completion without an unprocessed part in the requested
+operation range,
+.Fa "rmsr->r_len"
+is updated to be the value 0, and
+.Fa "rmsr->r_offset"
+is updated to be the smallest of
+.Fa "rqsr->r_offset" +
+.Fa "rqsr->r_len" ;
+and the end-of-file offset.
+The file descriptor's file offset is not used or modified by the system call.
Both
.Fa rqsr
and
@@ -92,9 +103,9 @@
.Fa rqsr
argument.
The
-.Va "rqsr->r_offset"
+.Fa "rqsr->r_offset"
has to be a value greater than or equal to 0, and the
-.Va "rqsr->r_len"
+.Fa "rqsr->r_len"
has to be a value greater than 0.
.Pp
If the file system supports hole-punching,
@@ -137,6 +148,12 @@
.Fa "range->r_len"
argument was less than or equal to zero.
.It Bq Er EINVAL
+The value of
+.Fa "range->r_offset" +
+.Fa "range->r_len"
+is greater than
+.Dv OFF_MAX .
+.It Bq Er EINVAL
An invalid or unsupported flag is included in
.Fa flags .
.It Bq Er EINVAL
Index: share/man/man9/VOP_DEALLOCATE.9
===================================================================
--- share/man/man9/VOP_DEALLOCATE.9
+++ share/man/man9/VOP_DEALLOCATE.9
@@ -74,6 +74,14 @@
are updated to reflect the portion of the range that
still needs to be zeroed/deallocated on return.
Partial result is considered a successful operation.
+For a successful completion without an unprocessed portion of the range,
+.Fa *len
+is updated to be the value 0, and
+.Fa *offset
+is updated to be the smallest of
+.Fa *offset +
+.Fa *len
+passed to the call and the end-of-file offset.
.Sh LOCKS
The vnode should be locked on entry and will still be locked on exit.
.Sh RETURN VALUES
Index: share/man/man9/vn_deallocate.9
===================================================================
--- share/man/man9/vn_deallocate.9
+++ share/man/man9/vn_deallocate.9
@@ -95,6 +95,14 @@
and
.Fa *length
are updated to reflect the unprocessed operation range of the call.
+For a successful completion,
+.Fa *length
+is updated to be the value 0, and
+.Fa *offset
+is updated to be the smallest of
+.Fa *offset +
+.Fa *length
+passed to the call and the end-of-file offset.
.Sh RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the
appropriate error is returned.
Index: sys/kern/uipc_shm.c
===================================================================
--- sys/kern/uipc_shm.c
+++ sys/kern/uipc_shm.c
@@ -1898,13 +1898,16 @@
{
vm_object_t object;
vm_pindex_t pistart, pi, piend;
- vm_ooffset_t off, len;
+ vm_ooffset_t off;
+ off_t len;
int startofs, endofs, end;
int error;
off = *offset;
len = *length;
KASSERT(off + len <= (vm_ooffset_t)OFF_MAX, ("off + len overflows"));
+ if (off + len > shmfd->shm_size)
+ len = shmfd->shm_size - off;
object = shmfd->shm_object;
startofs = off & PAGE_MASK;
endofs = (off + len) & PAGE_MASK;
@@ -1939,6 +1942,12 @@
len -= endofs;
}
+ /* Handle the case when offset is beyond shm size */
+ if (len < 0) {
+ off -= len;
+ len = 0;
+ }
+
out:
VM_OBJECT_WUNLOCK(shmfd->shm_object);
*offset = off;
@@ -1974,8 +1983,6 @@
break;
}
error = shm_deallocate(shmfd, &off, &len, flags);
- if (error != 0)
- break;
*offset = off;
*length = len;
break;
Index: sys/kern/vfs_default.c
===================================================================
--- sys/kern/vfs_default.c
+++ sys/kern/vfs_default.c
@@ -1138,14 +1138,13 @@
vp = ap->a_vp;
offset = *ap->a_offset;
- len = *ap->a_len;
cred = ap->a_cred;
error = VOP_GETATTR(vp, &va, cred);
if (error)
return (error);
- len = omin(OFF_MAX - offset, *ap->a_len);
+ len = omin(va.va_size - offset, *ap->a_len);
while (len > 0) {
noff = offset;
error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred);
@@ -1185,6 +1184,11 @@
if (should_yield())
break;
}
+ /* Handle the case when offset is beyond EOF */
+ if (len < 0) {
+ offset -= len;
+ len = 0;
+ }
out:
*ap->a_offset = offset;
*ap->a_len = len;

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