uipc_shm.c (454bc887f250ce0bceaabd0ec624d077269d3220) uipc_shm.c (1eaa36523cb921e90d61b20531ed525aba0cfe7e)
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2006, 2011, 2016-2017 Robert N. M. Watson
5 * Copyright 2020 The FreeBSD Foundation
6 * All rights reserved.
7 *
8 * Portions of this software were developed by BAE Systems, the University of

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1900 vm_pindex_t pistart, pi, piend;
1901 vm_ooffset_t off, len;
1902 int startofs, endofs, end;
1903 int error;
1904
1905 off = *offset;
1906 len = *length;
1907 KASSERT(off + len <= (vm_ooffset_t)OFF_MAX, ("off + len overflows"));
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2006, 2011, 2016-2017 Robert N. M. Watson
5 * Copyright 2020 The FreeBSD Foundation
6 * All rights reserved.
7 *
8 * Portions of this software were developed by BAE Systems, the University of

--- 1891 unchanged lines hidden (view full) ---

1900 vm_pindex_t pistart, pi, piend;
1901 vm_ooffset_t off, len;
1902 int startofs, endofs, end;
1903 int error;
1904
1905 off = *offset;
1906 len = *length;
1907 KASSERT(off + len <= (vm_ooffset_t)OFF_MAX, ("off + len overflows"));
1908 if (off + len > shmfd->shm_size)
1909 len = shmfd->shm_size - off;
1908 object = shmfd->shm_object;
1909 startofs = off & PAGE_MASK;
1910 endofs = (off + len) & PAGE_MASK;
1911 pistart = OFF_TO_IDX(off);
1912 piend = OFF_TO_IDX(off + len);
1913 pi = OFF_TO_IDX(off + PAGE_MASK);
1914 error = 0;
1915
1910 object = shmfd->shm_object;
1911 startofs = off & PAGE_MASK;
1912 endofs = (off + len) & PAGE_MASK;
1913 pistart = OFF_TO_IDX(off);
1914 piend = OFF_TO_IDX(off + len);
1915 pi = OFF_TO_IDX(off + PAGE_MASK);
1916 error = 0;
1917
1918 /* Handle the case when offset is beyond shm size */
1919 if ((off_t)len < 0) {
1920 *offset = shmfd->shm_size;
1921 *length = 0;
1922 return (0);
1923 }
1924
1916 VM_OBJECT_WLOCK(object);
1917
1918 if (startofs != 0) {
1919 end = pistart != piend ? PAGE_SIZE : endofs;
1920 error = shm_partial_page_invalidate(object, pistart, startofs,
1921 end);
1922 if (error)
1923 goto out;

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1969 &shmfd->shm_mtx);
1970 switch (cmd) {
1971 case SPACECTL_DEALLOC:
1972 if ((shmfd->shm_seals & F_SEAL_WRITE) != 0) {
1973 error = EPERM;
1974 break;
1975 }
1976 error = shm_deallocate(shmfd, &off, &len, flags);
1925 VM_OBJECT_WLOCK(object);
1926
1927 if (startofs != 0) {
1928 end = pistart != piend ? PAGE_SIZE : endofs;
1929 error = shm_partial_page_invalidate(object, pistart, startofs,
1930 end);
1931 if (error)
1932 goto out;

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1978 &shmfd->shm_mtx);
1979 switch (cmd) {
1980 case SPACECTL_DEALLOC:
1981 if ((shmfd->shm_seals & F_SEAL_WRITE) != 0) {
1982 error = EPERM;
1983 break;
1984 }
1985 error = shm_deallocate(shmfd, &off, &len, flags);
1977 if (error != 0)
1978 break;
1979 *offset = off;
1980 *length = len;
1981 break;
1982 default:
1983 __assert_unreachable();
1984 }
1985 rangelock_unlock(&shmfd->shm_rl, rl_cookie, &shmfd->shm_mtx);
1986 return (error);

--- 106 unchanged lines hidden --- 		1986 *offset = off;
1987 *length = len;
1988 break;
1989 default:
1990 __assert_unreachable();
1991 }
1992 rangelock_unlock(&shmfd->shm_rl, rl_cookie, &shmfd->shm_mtx);
1993 return (error);

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