Linux 4.1 compat: loop device on ZFS
Starting from Linux 4.1 allows iov_iter with bio_vec to be passed into iter_read/iter_write. Notably, the loop device will pass bio_vec to backend filesystem. However, current ZFS code assumes iovec without any check, so it will always crash when using loop device. With the restructured uio_t, we can safely pass bio_vec in uio_t with UIO_BVEC set. The uio* functions are modified to handle bio_vec case separately. The const uio_iov causes some warning in xuio related stuff, so explicit convert them to non const. Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3511 Closes #3640
This commit is contained in:
Chunwei Chen
Brian Behlendorf
parent
17888ae30d
commit
5475aada94
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@ -35,6 +35,9 @@
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* software developed by the University of California, Berkeley, and its
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* contributors.
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*/
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/*
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* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
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*/
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/*
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* The uio support from OpenSolaris has been added as a short term
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@ -46,6 +49,7 @@
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#include <sys/types.h>
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#include <sys/uio_impl.h>
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#include <linux/kmap_compat.h>
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/*
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* Move "n" bytes at byte address "p"; "rw" indicates the direction
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@ -53,20 +57,17 @@
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* update to reflect the data which was moved. Returns 0 on success or
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* a non-zero errno on failure.
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*/
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int
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uiomove(void *p, size_t n, enum uio_rw rw, struct uio *uio)
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static int
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uiomove_iov(void *p, size_t n, enum uio_rw rw, struct uio *uio)
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{
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struct iovec *iov;
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const struct iovec *iov = uio->uio_iov;
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size_t skip = uio->uio_skip;
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ulong_t cnt;
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ASSERT3U(skip, <, iov->iov_len);
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while (n && uio->uio_resid) {
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iov = uio->uio_iov;
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cnt = MIN(iov->iov_len, n);
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if (cnt == 0l) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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continue;
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}
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cnt = MIN(iov->iov_len - skip, n);
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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case UIO_USERISPACE:
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@ -75,22 +76,29 @@ uiomove(void *p, size_t n, enum uio_rw rw, struct uio *uio)
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* iov->iov_base = user data pointer
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*/
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if (rw == UIO_READ) {
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if (copy_to_user(iov->iov_base, p, cnt))
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if (copy_to_user(iov->iov_base+skip, p, cnt))
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return (EFAULT);
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} else {
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if (copy_from_user(p, iov->iov_base, cnt))
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if (copy_from_user(p, iov->iov_base+skip, cnt))
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return (EFAULT);
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}
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break;
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case UIO_SYSSPACE:
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if (rw == UIO_READ)
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bcopy(p, iov->iov_base, cnt);
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bcopy(p, iov->iov_base + skip, cnt);
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else
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bcopy(iov->iov_base, p, cnt);
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bcopy(iov->iov_base + skip, p, cnt);
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break;
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default:
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ASSERT(0);
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}
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iov->iov_base += cnt;
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iov->iov_len -= cnt;
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skip += cnt;
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if (skip == iov->iov_len) {
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skip = 0;
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uio->uio_iov = (++iov);
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uio->uio_iovcnt--;
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}
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uio->uio_skip = skip;
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uio->uio_resid -= cnt;
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uio->uio_loffset += cnt;
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p = (caddr_t)p + cnt;
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@ -98,6 +106,50 @@ uiomove(void *p, size_t n, enum uio_rw rw, struct uio *uio)
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}
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return (0);
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}
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static int
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uiomove_bvec(void *p, size_t n, enum uio_rw rw, struct uio *uio)
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{
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const struct bio_vec *bv = uio->uio_bvec;
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size_t skip = uio->uio_skip;
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ulong_t cnt;
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ASSERT3U(skip, <, bv->bv_len);
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while (n && uio->uio_resid) {
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void *paddr;
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cnt = MIN(bv->bv_len - skip, n);
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paddr = zfs_kmap_atomic(bv->bv_page, KM_USER1);
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if (rw == UIO_READ)
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bcopy(p, paddr + bv->bv_offset + skip, cnt);
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else
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bcopy(paddr + bv->bv_offset + skip, p, cnt);
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zfs_kunmap_atomic(paddr, KM_USER1);
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skip += cnt;
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if (skip == bv->bv_len) {
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skip = 0;
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uio->uio_bvec = (++bv);
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uio->uio_iovcnt--;
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}
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uio->uio_skip = skip;
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uio->uio_resid -= cnt;
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uio->uio_loffset += cnt;
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p = (caddr_t)p + cnt;
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n -= cnt;
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}
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return (0);
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}
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int
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uiomove(void *p, size_t n, enum uio_rw rw, struct uio *uio)
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{
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if (uio->uio_segflg != UIO_BVEC)
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return (uiomove_iov(p, n, rw, uio));
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else
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return (uiomove_bvec(p, n, rw, uio));
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}
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EXPORT_SYMBOL(uiomove);
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#define fuword8(uptr, vptr) get_user((*vptr), (uptr))
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@ -111,39 +163,39 @@ EXPORT_SYMBOL(uiomove);
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void
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uio_prefaultpages(ssize_t n, struct uio *uio)
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{
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struct iovec *iov;
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const struct iovec *iov;
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ulong_t cnt, incr;
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caddr_t p;
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uint8_t tmp;
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int iovcnt;
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size_t skip = uio->uio_skip;
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/* no need to fault in kernel pages */
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switch (uio->uio_segflg) {
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case UIO_SYSSPACE:
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case UIO_BVEC:
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return;
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case UIO_USERSPACE:
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case UIO_USERISPACE:
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break;
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default:
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ASSERT(0);
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}
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iov = uio->uio_iov;
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iovcnt = uio->uio_iovcnt;
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ASSERT3U(skip, <, iov->iov_len);
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while ((n > 0) && (iovcnt > 0)) {
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cnt = MIN(iov->iov_len, n);
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if (cnt == 0) {
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/* empty iov entry */
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iov++;
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iovcnt--;
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continue;
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}
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cnt = MIN(iov->iov_len - skip, n);
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n -= cnt;
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/*
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* touch each page in this segment.
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*/
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p = iov->iov_base;
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p = iov->iov_base + skip;
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while (cnt) {
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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case UIO_USERISPACE:
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if (fuword8((uint8_t *) p, &tmp))
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return;
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break;
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case UIO_SYSSPACE:
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bcopy(p, &tmp, 1);
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break;
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}
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incr = MIN(cnt, PAGESIZE);
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p += incr;
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cnt -= incr;
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@ -152,18 +204,11 @@ uio_prefaultpages(ssize_t n, struct uio *uio)
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* touch the last byte in case it straddles a page.
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*/
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p--;
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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case UIO_USERISPACE:
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if (fuword8((uint8_t *) p, &tmp))
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return;
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break;
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case UIO_SYSSPACE:
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bcopy(p, &tmp, 1);
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break;
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}
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iov++;
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iovcnt--;
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skip = 0;
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}
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}
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EXPORT_SYMBOL(uio_prefaultpages);
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@ -175,49 +220,13 @@ EXPORT_SYMBOL(uio_prefaultpages);
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int
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uiocopy(void *p, size_t n, enum uio_rw rw, struct uio *uio, size_t *cbytes)
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{
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struct iovec *iov;
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ulong_t cnt;
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int iovcnt;
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struct uio uio_copy;
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int ret;
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iovcnt = uio->uio_iovcnt;
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*cbytes = 0;
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for (iov = uio->uio_iov; n && iovcnt; iov++, iovcnt--) {
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cnt = MIN(iov->iov_len, n);
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if (cnt == 0)
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continue;
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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case UIO_USERISPACE:
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/*
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* p = kernel data pointer
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* iov->iov_base = user data pointer
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*/
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if (rw == UIO_READ) {
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/* UIO_READ = copy data from kernel to user */
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if (copy_to_user(iov->iov_base, p, cnt))
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return (EFAULT);
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} else {
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/* UIO_WRITE = copy data from user to kernel */
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if (copy_from_user(p, iov->iov_base, cnt))
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return (EFAULT);
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}
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break;
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case UIO_SYSSPACE:
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if (rw == UIO_READ)
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bcopy(p, iov->iov_base, cnt);
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else
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bcopy(iov->iov_base, p, cnt);
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break;
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}
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p = (caddr_t)p + cnt;
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n -= cnt;
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*cbytes += cnt;
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}
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return (0);
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bcopy(uio, &uio_copy, sizeof (struct uio));
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ret = uiomove(p, n, rw, &uio_copy);
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*cbytes = uio->uio_resid - uio_copy.uio_resid;
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return (ret);
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}
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EXPORT_SYMBOL(uiocopy);
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@ -229,21 +238,23 @@ uioskip(uio_t *uiop, size_t n)
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{
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if (n > uiop->uio_resid)
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return;
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while (n != 0) {
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iovec_t *iovp = uiop->uio_iov;
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size_t niovb = MIN(iovp->iov_len, n);
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if (niovb == 0) {
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uiop->uio_skip += n;
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if (uiop->uio_segflg != UIO_BVEC) {
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while (uiop->uio_skip >= uiop->uio_iov->iov_len) {
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uiop->uio_skip -= uiop->uio_iov->iov_len;
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uiop->uio_iov++;
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uiop->uio_iovcnt--;
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continue;
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}
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iovp->iov_base += niovb;
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uiop->uio_loffset += niovb;
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iovp->iov_len -= niovb;
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uiop->uio_resid -= niovb;
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n -= niovb;
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} else {
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while (uiop->uio_skip >= uiop->uio_bvec->bv_len) {
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uiop->uio_skip -= uiop->uio_bvec->bv_len;
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uiop->uio_bvec++;
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uiop->uio_iovcnt--;
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}
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}
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uiop->uio_loffset += n;
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uiop->uio_resid -= n;
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}
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EXPORT_SYMBOL(uioskip);
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#endif /* _KERNEL */
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@ -23,6 +23,7 @@
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* Copyright (c) 2011, 2014 by Delphix. All rights reserved.
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* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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* Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
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*/
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#include <sys/dmu.h>
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@ -933,7 +934,7 @@ dmu_xuio_init(xuio_t *xuio, int nblk)
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priv = kmem_zalloc(sizeof (dmu_xuio_t), KM_SLEEP);
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priv->cnt = nblk;
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priv->bufs = kmem_zalloc(nblk * sizeof (arc_buf_t *), KM_SLEEP);
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priv->iovp = uio->uio_iov;
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priv->iovp = (iovec_t *)uio->uio_iov;
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XUIO_XUZC_PRIV(xuio) = priv;
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if (XUIO_XUZC_RW(xuio) == UIO_READ)
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@ -974,7 +975,7 @@ dmu_xuio_add(xuio_t *xuio, arc_buf_t *abuf, offset_t off, size_t n)
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ASSERT(i < priv->cnt);
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ASSERT(off + n <= arc_buf_size(abuf));
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iov = uio->uio_iov + i;
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iov = (iovec_t *)uio->uio_iov + i;
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iov->iov_base = (char *)abuf->b_data + off;
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iov->iov_len = n;
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priv->bufs[i] = abuf;
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@ -21,6 +21,7 @@
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2013 by Delphix. All rights reserved.
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* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
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*/
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/* Portions Copyright 2007 Jeremy Teo */
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@ -591,10 +592,10 @@ zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
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int max_blksz = zsb->z_max_blksz;
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int error = 0;
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arc_buf_t *abuf;
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iovec_t *aiov = NULL;
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const iovec_t *aiov = NULL;
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xuio_t *xuio = NULL;
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int i_iov = 0;
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iovec_t *iovp = uio->uio_iov;
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const iovec_t *iovp = uio->uio_iov;
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int write_eof;
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int count = 0;
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sa_bulk_attr_t bulk[4];
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@ -714,6 +715,7 @@ zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
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if (xuio && abuf == NULL) {
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ASSERT(i_iov < iovcnt);
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ASSERT3U(uio->uio_segflg, !=, UIO_BVEC);
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aiov = &iovp[i_iov];
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abuf = dmu_xuio_arcbuf(xuio, i_iov);
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dmu_xuio_clear(xuio, i_iov);
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@ -20,6 +20,7 @@
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*/
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/*
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* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
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* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
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*/
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@ -202,17 +203,18 @@ zpl_aio_fsync(struct kiocb *kiocb, int datasync)
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#error "Unsupported fops->fsync() implementation"
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#endif
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static inline ssize_t
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static ssize_t
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zpl_read_common_iovec(struct inode *ip, const struct iovec *iovp, size_t count,
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unsigned long nr_segs, loff_t *ppos, uio_seg_t segment,
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int flags, cred_t *cr)
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unsigned long nr_segs, loff_t *ppos, uio_seg_t segment, int flags,
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cred_t *cr, size_t skip)
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{
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ssize_t read;
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uio_t uio;
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int error;
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fstrans_cookie_t cookie;
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uio.uio_iov = (struct iovec *)iovp;
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uio.uio_iov = iovp;
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uio.uio_skip = skip;
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uio.uio_resid = count;
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uio.uio_iovcnt = nr_segs;
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uio.uio_loffset = *ppos;
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@ -242,7 +244,7 @@ zpl_read_common(struct inode *ip, const char *buf, size_t len, loff_t *ppos,
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iov.iov_len = len;
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return (zpl_read_common_iovec(ip, &iov, len, 1, ppos, segment,
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flags, cr));
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flags, cr, 0));
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}
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static ssize_t
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@ -261,24 +263,17 @@ zpl_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
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static ssize_t
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zpl_iter_read_common(struct kiocb *kiocb, const struct iovec *iovp,
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unsigned long nr_segs, size_t count)
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unsigned long nr_segs, size_t count, uio_seg_t seg, size_t skip)
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{
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cred_t *cr = CRED();
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struct file *filp = kiocb->ki_filp;
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ssize_t read;
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size_t alloc_size = sizeof (struct iovec) * nr_segs;
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struct iovec *iov_tmp = kmem_alloc(alloc_size, KM_SLEEP);
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bcopy(iovp, iov_tmp, alloc_size);
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ASSERT(iovp);
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crhold(cr);
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read = zpl_read_common_iovec(filp->f_mapping->host, iov_tmp, count,
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nr_segs, &kiocb->ki_pos, UIO_USERSPACE, filp->f_flags, cr);
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read = zpl_read_common_iovec(filp->f_mapping->host, iovp, count,
|
||||
nr_segs, &kiocb->ki_pos, seg, filp->f_flags, cr, skip);
|
||||
crfree(cr);
|
||||
|
||||
kmem_free(iov_tmp, alloc_size);
|
||||
|
||||
return (read);
|
||||
}
|
||||
|
||||
|
|
@ -286,22 +281,32 @@ zpl_iter_read_common(struct kiocb *kiocb, const struct iovec *iovp,
|
|||
static ssize_t
|
||||
zpl_iter_read(struct kiocb *kiocb, struct iov_iter *to)
|
||||
{
|
||||
return (zpl_iter_read_common(kiocb, to->iov, to->nr_segs,
|
||||
iov_iter_count(to)));
|
||||
ssize_t ret;
|
||||
uio_seg_t seg = UIO_USERSPACE;
|
||||
if (to->type & ITER_KVEC)
|
||||
seg = UIO_SYSSPACE;
|
||||
if (to->type & ITER_BVEC)
|
||||
seg = UIO_BVEC;
|
||||
ret = zpl_iter_read_common(kiocb, to->iov, to->nr_segs,
|
||||
iov_iter_count(to), seg, to->iov_offset);
|
||||
if (ret > 0)
|
||||
iov_iter_advance(to, ret);
|
||||
return (ret);
|
||||
}
|
||||
#else
|
||||
static ssize_t
|
||||
zpl_aio_read(struct kiocb *kiocb, const struct iovec *iovp,
|
||||
unsigned long nr_segs, loff_t pos)
|
||||
{
|
||||
return (zpl_iter_read_common(kiocb, iovp, nr_segs, kiocb->ki_nbytes));
|
||||
return (zpl_iter_read_common(kiocb, iovp, nr_segs, kiocb->ki_nbytes,
|
||||
UIO_USERSPACE, 0));
|
||||
}
|
||||
#endif /* HAVE_VFS_RW_ITERATE */
|
||||
|
||||
static inline ssize_t
|
||||
static ssize_t
|
||||
zpl_write_common_iovec(struct inode *ip, const struct iovec *iovp, size_t count,
|
||||
unsigned long nr_segs, loff_t *ppos, uio_seg_t segment,
|
||||
int flags, cred_t *cr)
|
||||
unsigned long nr_segs, loff_t *ppos, uio_seg_t segment, int flags,
|
||||
cred_t *cr, size_t skip)
|
||||
{
|
||||
ssize_t wrote;
|
||||
uio_t uio;
|
||||
|
|
@ -311,7 +316,8 @@ zpl_write_common_iovec(struct inode *ip, const struct iovec *iovp, size_t count,
|
|||
if (flags & O_APPEND)
|
||||
*ppos = i_size_read(ip);
|
||||
|
||||
uio.uio_iov = (struct iovec *)iovp;
|
||||
uio.uio_iov = iovp;
|
||||
uio.uio_skip = skip;
|
||||
uio.uio_resid = count;
|
||||
uio.uio_iovcnt = nr_segs;
|
||||
uio.uio_loffset = *ppos;
|
||||
|
|
@ -340,7 +346,7 @@ zpl_write_common(struct inode *ip, const char *buf, size_t len, loff_t *ppos,
|
|||
iov.iov_len = len;
|
||||
|
||||
return (zpl_write_common_iovec(ip, &iov, len, 1, ppos, segment,
|
||||
flags, cr));
|
||||
flags, cr, 0));
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
|
|
@ -359,24 +365,17 @@ zpl_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
|
|||
|
||||
static ssize_t
|
||||
zpl_iter_write_common(struct kiocb *kiocb, const struct iovec *iovp,
|
||||
unsigned long nr_segs, size_t count)
|
||||
unsigned long nr_segs, size_t count, uio_seg_t seg, size_t skip)
|
||||
{
|
||||
cred_t *cr = CRED();
|
||||
struct file *filp = kiocb->ki_filp;
|
||||
ssize_t wrote;
|
||||
size_t alloc_size = sizeof (struct iovec) * nr_segs;
|
||||
struct iovec *iov_tmp = kmem_alloc(alloc_size, KM_SLEEP);
|
||||
bcopy(iovp, iov_tmp, alloc_size);
|
||||
|
||||
ASSERT(iovp);
|
||||
|
||||
crhold(cr);
|
||||
wrote = zpl_write_common_iovec(filp->f_mapping->host, iov_tmp, count,
|
||||
nr_segs, &kiocb->ki_pos, UIO_USERSPACE, filp->f_flags, cr);
|
||||
wrote = zpl_write_common_iovec(filp->f_mapping->host, iovp, count,
|
||||
nr_segs, &kiocb->ki_pos, seg, filp->f_flags, cr, skip);
|
||||
crfree(cr);
|
||||
|
||||
kmem_free(iov_tmp, alloc_size);
|
||||
|
||||
return (wrote);
|
||||
}
|
||||
|
||||
|
|
@ -384,15 +383,25 @@ zpl_iter_write_common(struct kiocb *kiocb, const struct iovec *iovp,
|
|||
static ssize_t
|
||||
zpl_iter_write(struct kiocb *kiocb, struct iov_iter *from)
|
||||
{
|
||||
return (zpl_iter_write_common(kiocb, from->iov, from->nr_segs,
|
||||
iov_iter_count(from)));
|
||||
ssize_t ret;
|
||||
uio_seg_t seg = UIO_USERSPACE;
|
||||
if (from->type & ITER_KVEC)
|
||||
seg = UIO_SYSSPACE;
|
||||
if (from->type & ITER_BVEC)
|
||||
seg = UIO_BVEC;
|
||||
ret = zpl_iter_write_common(kiocb, from->iov, from->nr_segs,
|
||||
iov_iter_count(from), seg, from->iov_offset);
|
||||
if (ret > 0)
|
||||
iov_iter_advance(from, ret);
|
||||
return (ret);
|
||||
}
|
||||
#else
|
||||
static ssize_t
|
||||
zpl_aio_write(struct kiocb *kiocb, const struct iovec *iovp,
|
||||
unsigned long nr_segs, loff_t pos)
|
||||
{
|
||||
return (zpl_iter_write_common(kiocb, iovp, nr_segs, kiocb->ki_nbytes));
|
||||
return (zpl_iter_write_common(kiocb, iovp, nr_segs, kiocb->ki_nbytes,
|
||||
UIO_USERSPACE, 0));
|
||||
}
|
||||
#endif /* HAVE_VFS_RW_ITERATE */
|
||||
|
||||
|
|
|
|||
|
|
@ -20,6 +20,7 @@
|
|||
*/
|
||||
/*
|
||||
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
|
||||
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
|
||||
*/
|
||||
|
||||
|
||||
|
|
@ -371,6 +372,7 @@ zpl_follow_link(struct dentry *dentry, void **symlink_cookie)
|
|||
|
||||
uio.uio_iov = &iov;
|
||||
uio.uio_iovcnt = 1;
|
||||
uio.uio_skip = 0;
|
||||
uio.uio_resid = (MAXPATHLEN - 1);
|
||||
uio.uio_segflg = UIO_SYSSPACE;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue