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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/spdk/lib/util/iov.c | |
parent | Initial commit. (diff) | |
download | ceph-6d07fdb6bb33b1af39833b850bb6cf8af79fe293.tar.xz ceph-6d07fdb6bb33b1af39833b850bb6cf8af79fe293.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/spdk/lib/util/iov.c')
-rw-r--r-- | src/spdk/lib/util/iov.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/spdk/lib/util/iov.c b/src/spdk/lib/util/iov.c new file mode 100644 index 000000000..e89ef9d21 --- /dev/null +++ b/src/spdk/lib/util/iov.c @@ -0,0 +1,111 @@ +/*- + * BSD LICENSE + * + * Copyright (c) Intel Corporation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "spdk/util.h" + +size_t +spdk_iovcpy(struct iovec *siov, size_t siovcnt, struct iovec *diov, size_t diovcnt) +{ + size_t total_sz; + size_t sidx; + size_t didx; + int siov_len; + uint8_t *siov_base; + int diov_len; + uint8_t *diov_base; + + /* d prefix = destination. s prefix = source. */ + + assert(diovcnt > 0); + assert(siovcnt > 0); + + total_sz = 0; + sidx = 0; + didx = 0; + siov_len = siov[0].iov_len; + siov_base = siov[0].iov_base; + diov_len = diov[0].iov_len; + diov_base = diov[0].iov_base; + while (siov_len > 0 && diov_len > 0) { + if (siov_len == diov_len) { + memcpy(diov_base, siov_base, siov_len); + total_sz += siov_len; + + /* Advance both iovs to the next element */ + sidx++; + if (sidx == siovcnt) { + break; + } + + didx++; + if (didx == diovcnt) { + break; + } + + siov_len = siov[sidx].iov_len; + siov_base = siov[sidx].iov_base; + diov_len = diov[didx].iov_len; + diov_base = diov[didx].iov_base; + } else if (siov_len < diov_len) { + memcpy(diov_base, siov_base, siov_len); + total_sz += siov_len; + + /* Advance only the source to the next element */ + sidx++; + if (sidx == siovcnt) { + break; + } + + diov_base += siov_len; + diov_len -= siov_len; + siov_len = siov[sidx].iov_len; + siov_base = siov[sidx].iov_base; + } else { + memcpy(diov_base, siov_base, diov_len); + total_sz += diov_len; + + /* Advance only the destination to the next element */ + didx++; + if (didx == diovcnt) { + break; + } + + siov_base += diov_len; + siov_len -= diov_len; + diov_len = diov[didx].iov_len; + diov_base = diov[didx].iov_base; + } + } + + return total_sz; +} |