Author: kib
Date: Fri Mar 15 11:16:12 2013
New Revision: 248319
URL: http://svnweb.freebsd.org/changeset/base/248319
Log:
Implement the helper function vn_io_fault_pgmove(), intended to use by
the filesystem VOP_READ() and VOP_WRITE() implementations in the same
way as vn_io_fault_uiomove() over the unmapped buffers. Helper
provides the convenient wrapper over the pmap_copy_pages() for struct
uio consumers, taking care of the TDP_UIOHELD situations.
Sponsored by: The FreeBSD Foundation
Tested by: pho
MFC after: 2 weeks
Modified:
head/sys/kern/vfs_vnops.c
head/sys/sys/vnode.h
Modified: head/sys/kern/vfs_vnops.c
==============================================================================
--- head/sys/kern/vfs_vnops.c Fri Mar 15 10:21:18 2013 (r248318)
+++ head/sys/kern/vfs_vnops.c Fri Mar 15 11:16:12 2013 (r248319)
@@ -1122,6 +1122,45 @@ vn_io_fault_uiomove(char *data, int xfer
return (error);
}
+int
+vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize,
+ struct uio *uio)
+{
+ struct thread *td;
+ vm_offset_t iov_base;
+ int cnt, pgadv;
+
+ td = curthread;
+ if ((td->td_pflags & TDP_UIOHELD) == 0 ||
+ uio->uio_segflg != UIO_USERSPACE)
+ return (uiomove_fromphys(ma, offset, xfersize, uio));
+
+ KASSERT(uio->uio_iovcnt == 1, ("uio_iovcnt %d", uio->uio_iovcnt));
+ cnt = xfersize > uio->uio_resid ? uio->uio_resid : xfersize;
+ iov_base = (vm_offset_t)uio->uio_iov->iov_base;
+ switch (uio->uio_rw) {
+ case UIO_WRITE:
+ pmap_copy_pages(td->td_ma, iov_base & PAGE_MASK, ma,
+ offset, cnt);
+ break;
+ case UIO_READ:
+ pmap_copy_pages(ma, offset, td->td_ma, iov_base & PAGE_MASK,
+ cnt);
+ break;
+ }
+ pgadv = ((iov_base + cnt) >> PAGE_SHIFT) - (iov_base >> PAGE_SHIFT);
+ td->td_ma += pgadv;
+ KASSERT(td->td_ma_cnt >= pgadv, ("consumed pages %d %d", td->td_ma_cnt,
+ pgadv));
+ td->td_ma_cnt -= pgadv;
+ uio->uio_iov->iov_base = (char *)(iov_base + cnt);
+ uio->uio_iov->iov_len -= cnt;
+ uio->uio_resid -= cnt;
+ uio->uio_offset += cnt;
+ return (0);
+}
+
+
/*
* File table truncate routine.
*/
Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h Fri Mar 15 10:21:18 2013 (r248318)
+++ head/sys/sys/vnode.h Fri Mar 15 11:16:12 2013 (r248319)
@@ -693,6 +693,8 @@ int vn_vget_ino(struct vnode *vp, ino_t
struct vnode **rvp);
int vn_io_fault_uiomove(char *data, int xfersize, struct uio *uio);
+int vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize,
+ struct uio *uio);
#define vn_rangelock_unlock(vp, cookie)
\
rangelock_unlock(&(vp)->v_rl, (cookie), VI_MTX(vp))
_______________________________________________
svn-src-all@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
