Author: avg
Date: Wed Jul 13 09:09:34 2016
New Revision: 302722
URL: https://svnweb.freebsd.org/changeset/base/302722
Log:
MFC r298105: zfs: enable vn_io_fault support
Modified:
stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c
stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/cddl/contrib/opensolaris/ (props changed)
Modified: stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c
==============================================================================
--- stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c Wed Jul
13 09:09:21 2016 (r302721)
+++ stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c Wed Jul
13 09:09:34 2016 (r302722)
@@ -1025,8 +1025,13 @@ dmu_read_uio(objset_t *os, uint64_t obje
else
XUIOSTAT_BUMP(xuiostat_rbuf_copied);
} else {
+#ifdef illumos
err = uiomove((char *)db->db_data + bufoff, tocpy,
UIO_READ, uio);
+#else
+ err = vn_io_fault_uiomove((char *)db->db_data + bufoff,
+ tocpy, uio);
+#endif
}
if (err)
break;
@@ -1068,6 +1073,7 @@ dmu_write_uio_dnode(dnode_t *dn, uio_t *
else
dmu_buf_will_dirty(db, tx);
+#ifdef illumos
/*
* XXX uiomove could block forever (eg. nfs-backed
* pages). There needs to be a uiolockdown() function
@@ -1076,6 +1082,10 @@ dmu_write_uio_dnode(dnode_t *dn, uio_t *
*/
err = uiomove((char *)db->db_data + bufoff, tocpy,
UIO_WRITE, uio);
+#else
+ err = vn_io_fault_uiomove((char *)db->db_data + bufoff, tocpy,
+ uio);
+#endif
if (tocpy == db->db_size)
dmu_buf_fill_done(db, tx);
Modified: stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
==============================================================================
--- stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
Wed Jul 13 09:09:21 2016 (r302721)
+++ stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
Wed Jul 13 09:09:34 2016 (r302722)
@@ -1182,6 +1182,7 @@ zfs_domount(vfs_t *vfsp, char *osname)
vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES;
vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED;
+ vfsp->mnt_kern_flag |= MNTK_NO_IOPF; /* vn_io_fault can be used */
/*
* The fsid is 64 bits, composed of an 8-bit fs type, which
Modified: stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
==============================================================================
--- stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c Wed Jul
13 09:09:21 2016 (r302721)
+++ stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c Wed Jul
13 09:09:34 2016 (r302722)
@@ -595,7 +595,11 @@ mappedread(vnode_t *vp, int nbytes, uio_
VM_OBJECT_UNLOCK(obj);
va = zfs_map_page(pp, &sf);
+#ifdef illumos
error = uiomove(va + off, bytes, UIO_READ, uio);
+#else
+ error = vn_io_fault_uiomove(va + off, bytes, uio);
+#endif
zfs_unmap_page(sf);
VM_OBJECT_LOCK(obj);
page_unhold(pp);
@@ -962,18 +966,31 @@ zfs_write(vnode_t *vp, uio_t *uio, int i
* holding up the transaction if the data copy hangs
* up on a pagefault (e.g., from an NFS server mapping).
*/
+#ifdef illumos
size_t cbytes;
+#endif
abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
max_blksz);
ASSERT(abuf != NULL);
ASSERT(arc_buf_size(abuf) == max_blksz);
+#ifdef illumos
if (error = uiocopy(abuf->b_data, max_blksz,
UIO_WRITE, uio, &cbytes)) {
dmu_return_arcbuf(abuf);
break;
}
ASSERT(cbytes == max_blksz);
+#else
+ ssize_t resid = uio->uio_resid;
+ error = vn_io_fault_uiomove(abuf->b_data, max_blksz,
uio);
+ if (error != 0) {
+ uio->uio_offset -= resid - uio->uio_resid;
+ uio->uio_resid = resid;
+ dmu_return_arcbuf(abuf);
+ break;
+ }
+#endif
}
/*
@@ -1045,8 +1062,10 @@ zfs_write(vnode_t *vp, uio_t *uio, int i
dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl),
woff, abuf, tx);
}
+#ifdef illumos
ASSERT(tx_bytes <= uio->uio_resid);
uioskip(uio, tx_bytes);
+#endif
}
if (tx_bytes && vn_has_cached_data(vp)) {
update_pages(vp, woff, tx_bytes, zfsvfs->z_os,
@@ -1100,7 +1119,11 @@ zfs_write(vnode_t *vp, uio_t *uio, int i
while ((end_size = zp->z_size) < uio->uio_loffset) {
(void) atomic_cas_64(&zp->z_size, end_size,
uio->uio_loffset);
+#ifdef illumos
ASSERT(error == 0);
+#else
+ ASSERT(error == 0 || error == EFAULT);
+#endif
}
/*
* If we are replaying and eof is non zero then force
@@ -1110,7 +1133,10 @@ zfs_write(vnode_t *vp, uio_t *uio, int i
if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
zp->z_size = zfsvfs->z_replay_eof;
- error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
+ if (error == 0)
+ error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
+ else
+ (void) sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag);
dmu_tx_commit(tx);
@@ -1137,6 +1163,17 @@ zfs_write(vnode_t *vp, uio_t *uio, int i
return (error);
}
+#ifdef __FreeBSD__
+ /*
+ * EFAULT means that at least one page of the source buffer was not
+ * available. VFS will re-try remaining I/O upon this error.
+ */
+ if (error == EFAULT) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+#endif
+
if (ioflag & (FSYNC | FDSYNC) ||
zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
zil_commit(zilog, zp->z_id);
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