--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * Copyright (c) 2011, 2012 Whamcloud, Inc.
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/osd-zfs/osd_io.c
+ *
+ * Author: Alex Zhuravlev <bzzz@whamcloud.com>
+ * Author: Mike Pershin <tappro@whamcloud.com>
+ */
+
+#ifndef EXPORT_SYMTAB
+# define EXPORT_SYMTAB
+#endif
+#define DEBUG_SUBSYSTEM S_OSD
+
+#include <lustre_ver.h>
+#include <libcfs/libcfs.h>
+#include <lustre_fsfilt.h>
+#include <obd_support.h>
+#include <lustre_net.h>
+#include <obd.h>
+#include <obd_class.h>
+#include <lustre_disk.h>
+#include <lustre_fid.h>
+
+#include "osd_internal.h"
+
+#include <sys/dnode.h>
+#include <sys/dbuf.h>
+#include <sys/spa.h>
+#include <sys/stat.h>
+#include <sys/zap.h>
+#include <sys/spa_impl.h>
+#include <sys/zfs_znode.h>
+#include <sys/dmu_tx.h>
+#include <sys/dmu_objset.h>
+#include <sys/dsl_prop.h>
+#include <sys/sa_impl.h>
+#include <sys/txg.h>
+
+static char *osd_zerocopy_tag = "zerocopy";
+
+static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
+ struct lu_buf *buf, loff_t *pos,
+ struct lustre_capa *capa)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_device *osd = osd_obj2dev(obj);
+ uint64_t old_size;
+ int size = buf->lb_len;
+ int rc;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ cfs_read_lock(&obj->oo_attr_lock);
+ old_size = obj->oo_attr.la_size;
+ cfs_read_unlock(&obj->oo_attr_lock);
+
+ if (*pos + size > old_size) {
+ if (old_size < *pos)
+ return 0;
+ else
+ size = old_size - *pos;
+ }
+
+ rc = -dmu_read(osd->od_objset.os, obj->oo_db->db_object, *pos, size,
+ buf->lb_buf, DMU_READ_PREFETCH);
+ if (rc == 0) {
+ rc = size;
+ *pos += size;
+
+ /* XXX: workaround for bug in HEAD: fsfilt_ldiskfs_read() returns
+ * requested number of bytes, not actually read ones */
+ if (S_ISLNK(obj->oo_dt.do_lu.lo_header->loh_attr))
+ rc = buf->lb_len;
+ }
+ return rc;
+}
+
+static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
+ const loff_t size, loff_t pos,
+ struct thandle *th)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_thandle *oh;
+ uint64_t oid;
+ ENTRY;
+
+ oh = container_of0(th, struct osd_thandle, ot_super);
+
+ /* in some cases declare can race with creation (e.g. llog)
+ * and we need to wait till object is initialized. notice
+ * LOHA_EXISTs is supposed to be the last step in the
+ * initialization */
+
+ /* declare possible size change. notice we can't check
+ * current size here as another thread can change it */
+
+ if (dt_object_exists(dt)) {
+ LASSERT(obj->oo_db);
+ oid = obj->oo_db->db_object;
+
+ dmu_tx_hold_sa(oh->ot_tx, obj->oo_sa_hdl, 0);
+ } else {
+ oid = DMU_NEW_OBJECT;
+ dmu_tx_hold_sa_create(oh->ot_tx, ZFS_SA_BASE_ATTR_SIZE);
+ }
+
+ dmu_tx_hold_write(oh->ot_tx, oid, pos, size);
+
+ RETURN(0);
+}
+
+static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
+ const struct lu_buf *buf, loff_t *pos,
+ struct thandle *th, struct lustre_capa *capa,
+ int ignore_quota)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_device *osd = osd_obj2dev(obj);
+ udmu_objset_t *uos = &osd->od_objset;
+ struct osd_thandle *oh;
+ uint64_t offset = *pos;
+ int rc;
+ ENTRY;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ LASSERT(th != NULL);
+ oh = container_of0(th, struct osd_thandle, ot_super);
+
+ dmu_write(osd->od_objset.os, obj->oo_db->db_object, offset,
+ (uint64_t)buf->lb_len, buf->lb_buf, oh->ot_tx);
+ cfs_write_lock(&obj->oo_attr_lock);
+ if (obj->oo_attr.la_size < offset + buf->lb_len) {
+ obj->oo_attr.la_size = offset + buf->lb_len;
+ cfs_write_unlock(&obj->oo_attr_lock);
+ /* osd_object_sa_update() will be copying directly from oo_attr
+ * into dbuf. any update within a single txg will copy the
+ * most actual */
+ rc = osd_object_sa_update(obj, SA_ZPL_SIZE(uos),
+ &obj->oo_attr.la_size, 8, oh);
+ if (unlikely(rc))
+ GOTO(out, rc);
+ } else {
+ cfs_write_unlock(&obj->oo_attr_lock);
+ }
+
+ *pos += buf->lb_len;
+ rc = buf->lb_len;
+
+out:
+ RETURN(rc);
+}
+
+/*
+ * XXX: for the moment I don't want to use lnb_flags for osd-internal
+ * purposes as it's not very well defined ...
+ * instead I use the lowest bit of the address so that:
+ * arc buffer: .lnb_obj = abuf (arc we loan for write)
+ * dbuf buffer: .lnb_obj = dbuf | 1 (dbuf we get for read)
+ * copy buffer: .lnb_page->mapping = obj (page we allocate for write)
+ *
+ * bzzz, to blame
+ */
+static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
+ struct niobuf_local *lnb, int npages)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_device *osd = osd_obj2dev(obj);
+ unsigned long ptr;
+ int i;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ for (i = 0; i < npages; i++) {
+ if (lnb[i].page == NULL)
+ continue;
+ if (lnb[i].page->mapping == (void *)obj) {
+ /* this is anonymous page allocated for copy-write */
+ lnb[i].page->mapping = NULL;
+ __free_page(lnb[i].page);
+ cfs_atomic_dec(&osd->od_zerocopy_alloc);
+ } else {
+ /* see comment in osd_bufs_get_read() */
+ ptr = (unsigned long)lnb[i].dentry;
+ if (ptr & 1UL) {
+ ptr &= ~1UL;
+ dmu_buf_rele((void *)ptr, osd_zerocopy_tag);
+ cfs_atomic_dec(&osd->od_zerocopy_pin);
+ } else if (lnb[i].dentry != NULL) {
+ dmu_return_arcbuf((void *)lnb[i].dentry);
+ cfs_atomic_dec(&osd->od_zerocopy_loan);
+ }
+ }
+ lnb[i].page = NULL;
+ lnb[i].dentry = NULL;
+ }
+
+ return 0;
+}
+
+static struct page *kmem_to_page(void *addr)
+{
+ struct page *page;
+
+ if (kmem_virt(addr))
+ page = vmalloc_to_page(addr);
+ else
+ page = virt_to_page(addr);
+
+ return page;
+}
+
+static int osd_bufs_get_read(const struct lu_env *env, struct osd_object *obj,
+ loff_t off, ssize_t len, struct niobuf_local *lnb)
+{
+ struct osd_device *osd = osd_obj2dev(obj);
+ dmu_buf_t **dbp;
+ int rc, i, numbufs, npages = 0;
+ ENTRY;
+
+ /* grab buffers for read:
+ * OSD API let us to grab buffers first, then initiate IO(s)
+ * so that all required IOs will be done in parallel, but at the
+ * moment DMU doesn't provide us with a method to grab buffers.
+ * If we discover this is a vital for good performance we
+ * can get own replacement for dmu_buf_hold_array_by_bonus().
+ */
+ while (len > 0) {
+ rc = -dmu_buf_hold_array_by_bonus(obj->oo_db, off, len, TRUE,
+ osd_zerocopy_tag, &numbufs,
+ &dbp);
+ LASSERT(rc == 0);
+
+ for (i = 0; i < numbufs; i++) {
+ int bufoff, tocpy, thispage;
+ void *dbf = dbp[i];
+
+ LASSERT(len > 0);
+
+ cfs_atomic_inc(&osd->od_zerocopy_pin);
+
+ bufoff = off - dbp[i]->db_offset;
+ tocpy = min_t(int, dbp[i]->db_size - bufoff, len);
+
+ /* kind of trick to differentiate dbuf vs. arcbuf */
+ LASSERT(((unsigned long)dbp[i] & 1) == 0);
+ dbf = (void *) ((unsigned long)dbp[i] | 1);
+
+ while (tocpy > 0) {
+ thispage = CFS_PAGE_SIZE;
+ thispage -= bufoff & (CFS_PAGE_SIZE - 1);
+ thispage = min(tocpy, thispage);
+
+ lnb->rc = 0;
+ lnb->lnb_file_offset = off;
+ lnb->offset = bufoff & ~CFS_PAGE_MASK;
+ lnb->len = thispage;
+ lnb->page = kmem_to_page(dbp[i]->db_data +
+ bufoff);
+ /* mark just a single slot: we need this
+ * reference to dbuf to be release once */
+ lnb->dentry = dbf;
+ dbf = NULL;
+
+ tocpy -= thispage;
+ len -= thispage;
+ bufoff += thispage;
+ off += thispage;
+
+ npages++;
+ lnb++;
+ }
+
+ /* steal dbuf so dmu_buf_rele_array() cant release it */
+ dbp[i] = NULL;
+ }
+
+ dmu_buf_rele_array(dbp, numbufs, osd_zerocopy_tag);
+ }
+
+ RETURN(npages);
+}
+
+static int osd_bufs_get_write(const struct lu_env *env, struct osd_object *obj,
+ loff_t off, ssize_t len, struct niobuf_local *lnb)
+{
+ struct osd_device *osd = osd_obj2dev(obj);
+ int plen, off_in_block, sz_in_block;
+ int i = 0, npages = 0;
+ arc_buf_t *abuf;
+ uint32_t bs;
+ uint64_t dummy;
+ ENTRY;
+
+ dmu_object_size_from_db(obj->oo_db, &bs, &dummy);
+
+ /*
+ * currently only full blocks are subject to zerocopy approach:
+ * so that we're sure nobody is trying to update the same block
+ */
+ while (len > 0) {
+ LASSERT(npages < PTLRPC_MAX_BRW_PAGES);
+
+ off_in_block = off & (bs - 1);
+ sz_in_block = min_t(int, bs - off_in_block, len);
+
+ if (sz_in_block == bs) {
+ /* full block, try to use zerocopy */
+
+ abuf = dmu_request_arcbuf(obj->oo_db, bs);
+ if (unlikely(abuf == NULL))
+ GOTO(out_err, -ENOMEM);
+
+ cfs_atomic_inc(&osd->od_zerocopy_loan);
+
+ /* go over pages arcbuf contains, put them as
+ * local niobufs for ptlrpc's bulks */
+ while (sz_in_block > 0) {
+ plen = min_t(int, sz_in_block, CFS_PAGE_SIZE);
+
+ lnb[i].lnb_file_offset = off;
+ lnb[i].offset = 0;
+ lnb[i].len = plen;
+ lnb[i].rc = 0;
+ if (sz_in_block == bs)
+ lnb[i].dentry = (void *)abuf;
+ else
+ lnb[i].dentry = NULL;
+
+ /* this one is not supposed to fail */
+ lnb[i].page = kmem_to_page(abuf->b_data +
+ off_in_block);
+ LASSERT(lnb[i].page);
+
+ lprocfs_counter_add(osd->od_stats,
+ LPROC_OSD_ZEROCOPY_IO, 1);
+
+ sz_in_block -= plen;
+ len -= plen;
+ off += plen;
+ off_in_block += plen;
+ i++;
+ npages++;
+ }
+ } else {
+ if (off_in_block == 0 && len < bs &&
+ off + len >= obj->oo_attr.la_size)
+ lprocfs_counter_add(osd->od_stats,
+ LPROC_OSD_TAIL_IO, 1);
+
+ /* can't use zerocopy, allocate temp. buffers */
+ while (sz_in_block > 0) {
+ plen = min_t(int, sz_in_block, CFS_PAGE_SIZE);
+
+ lnb[i].lnb_file_offset = off;
+ lnb[i].offset = 0;
+ lnb[i].len = plen;
+ lnb[i].rc = 0;
+ lnb[i].dentry = NULL;
+
+ lnb[i].page = alloc_page(OSD_GFP_IO);
+ if (unlikely(lnb[i].page == NULL))
+ GOTO(out_err, -ENOMEM);
+
+ LASSERT(lnb[i].page->mapping == NULL);
+ lnb[i].page->mapping = (void *)obj;
+
+ cfs_atomic_inc(&osd->od_zerocopy_alloc);
+ lprocfs_counter_add(osd->od_stats,
+ LPROC_OSD_COPY_IO, 1);
+
+ sz_in_block -= plen;
+ len -= plen;
+ off += plen;
+ i++;
+ npages++;
+ }
+ }
+ }
+
+ RETURN(npages);
+
+out_err:
+ osd_bufs_put(env, &obj->oo_dt, lnb, npages);
+ RETURN(-ENOMEM);
+}
+
+static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
+ loff_t offset, ssize_t len, struct niobuf_local *lnb,
+ int rw, struct lustre_capa *capa)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ int rc;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ if (rw == 0)
+ rc = osd_bufs_get_read(env, obj, offset, len, lnb);
+ else
+ rc = osd_bufs_get_write(env, obj, offset, len, lnb);
+
+ return rc;
+}
+
+static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
+ struct niobuf_local *lnb, int npages)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ return 0;
+}
+
+static int osd_declare_write_commit(const struct lu_env *env,
+ struct dt_object *dt,
+ struct niobuf_local *lnb, int npages,
+ struct thandle *th)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_thandle *oh;
+ uint64_t offset = 0;
+ uint32_t size = 0;
+ int i;
+ ENTRY;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ LASSERT(lnb);
+ LASSERT(npages > 0);
+
+ oh = container_of0(th, struct osd_thandle, ot_super);
+
+ for (i = 0; i < npages; i++) {
+ if (lnb[i].rc)
+ /* ENOSPC, network RPC error, etc.
+ * We don't want to book space for pages which will be
+ * skipped in osd_write_commit(). Hence we skip pages
+ * with lnb_rc != 0 here too */
+ continue;
+ if (size == 0) {
+ /* first valid lnb */
+ offset = lnb[i].lnb_file_offset;
+ size = lnb[i].len;
+ continue;
+ }
+ if (offset + size == lnb[i].lnb_file_offset) {
+ /* this lnb is contiguous to the previous one */
+ size += lnb[i].len;
+ continue;
+ }
+
+ dmu_tx_hold_write(oh->ot_tx, obj->oo_db->db_object, offset,size);
+
+ offset = lnb->lnb_file_offset;
+ size = lnb->len;
+ }
+
+ if (size)
+ dmu_tx_hold_write(oh->ot_tx, obj->oo_db->db_object, offset,size);
+
+ dmu_tx_hold_sa(oh->ot_tx, obj->oo_sa_hdl, 0);
+
+ oh->ot_write_commit = 1; /* used in osd_trans_start() for fail_loc */
+
+ RETURN(0);
+}
+
+static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
+ struct niobuf_local *lnb, int npages,
+ struct thandle *th)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_device *osd = osd_obj2dev(obj);
+ udmu_objset_t *uos = &osd->od_objset;
+ struct osd_thandle *oh;
+ uint64_t new_size = 0;
+ int i, rc = 0;
+ ENTRY;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ LASSERT(th != NULL);
+ oh = container_of0(th, struct osd_thandle, ot_super);
+
+ for (i = 0; i < npages; i++) {
+ CDEBUG(D_INODE, "write %u bytes at %u\n",
+ (unsigned) lnb[i].len,
+ (unsigned) lnb[i].lnb_file_offset);
+
+ if (lnb[i].rc) {
+ /* ENOSPC, network RPC error, etc.
+ * Unlike ldiskfs, zfs allocates new blocks on rewrite,
+ * so we skip this page if lnb_rc is set to -ENOSPC */
+ CDEBUG(D_INODE, "obj "DFID": skipping lnb[%u]: rc=%d\n",
+ PFID(lu_object_fid(&dt->do_lu)), i,
+ lnb[i].rc);
+ continue;
+ }
+
+ if (lnb[i].page->mapping == (void *)obj) {
+ dmu_write(osd->od_objset.os, obj->oo_db->db_object,
+ lnb[i].lnb_file_offset, lnb[i].len,
+ kmap(lnb[i].page), oh->ot_tx);
+ kunmap(lnb[i].page);
+ } else if (lnb[i].dentry) {
+ LASSERT(((unsigned long)lnb[i].dentry & 1) == 0);
+ /* buffer loaned for zerocopy, try to use it.
+ * notice that dmu_assign_arcbuf() is smart
+ * enough to recognize changed blocksize
+ * in this case it fallbacks to dmu_write() */
+ dmu_assign_arcbuf(obj->oo_db, lnb[i].lnb_file_offset,
+ (void *)lnb[i].dentry, oh->ot_tx);
+ /* drop the reference, otherwise osd_put_bufs()
+ * will be releasing it - bad! */
+ lnb[i].dentry = NULL;
+ cfs_atomic_dec(&osd->od_zerocopy_loan);
+ }
+
+ if (new_size < lnb[i].lnb_file_offset + lnb[i].len)
+ new_size = lnb[i].lnb_file_offset + lnb[i].len;
+ }
+
+ if (unlikely(new_size == 0)) {
+ /* no pages to write, no transno is needed */
+ th->th_local = 1;
+ /* it is important to return 0 even when all lnb_rc == -ENOSPC
+ * since ofd_commitrw_write() retries several times on ENOSPC */
+ RETURN(0);
+ }
+
+ cfs_write_lock(&obj->oo_attr_lock);
+ if (obj->oo_attr.la_size < new_size) {
+ obj->oo_attr.la_size = new_size;
+ cfs_write_unlock(&obj->oo_attr_lock);
+ /* osd_object_sa_update() will be copying directly from
+ * oo_attr into dbuf. any update within a single txg will copy
+ * the most actual */
+ rc = osd_object_sa_update(obj, SA_ZPL_SIZE(uos),
+ &obj->oo_attr.la_size, 8, oh);
+ } else {
+ cfs_write_unlock(&obj->oo_attr_lock);
+ }
+
+ RETURN(rc);
+}
+
+static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
+ struct niobuf_local *lnb, int npages)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct lu_buf buf;
+ loff_t offset;
+ int i;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(obj->oo_db);
+
+ for (i = 0; i < npages; i++) {
+ buf.lb_buf = kmap(lnb[i].page);
+ buf.lb_len = lnb[i].len;
+ offset = lnb[i].lnb_file_offset;
+
+ CDEBUG(D_OTHER, "read %u bytes at %u\n",
+ (unsigned) lnb[i].len,
+ (unsigned) lnb[i].lnb_file_offset);
+ lnb[i].rc = osd_read(env, dt, &buf, &offset, NULL);
+ kunmap(lnb[i].page);
+
+ if (lnb[i].rc < buf.lb_len) {
+ /* all subsequent rc should be 0 */
+ while (++i < npages)
+ lnb[i].rc = 0;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Punch/truncate an object
+ *
+ * IN: db - dmu_buf of the object to free data in.
+ * off - start of section to free.
+ * len - length of section to free (DMU_OBJECT_END => to EOF).
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * The transaction passed to this routine must have
+ * dmu_tx_hold_sa() and if off < size, dmu_tx_hold_free()
+ * called and then assigned to a transaction group.
+ */
+static int __osd_object_punch(objset_t *os, dmu_buf_t *db, dmu_tx_t *tx,
+ uint64_t size, uint64_t off, uint64_t len)
+{
+ int rc = 0;
+
+ /* Assert that the transaction has been assigned to a
+ transaction group. */
+ LASSERT(tx->tx_txg != 0);
+ /*
+ * Nothing to do if file already at desired length.
+ */
+ if (len == DMU_OBJECT_END && size == off)
+ return 0;
+
+ if (off < size)
+ rc = -dmu_free_range(os, db->db_object, off, len, tx);
+
+ return rc;
+}
+
+static int osd_punch(const struct lu_env *env, struct dt_object *dt,
+ __u64 start, __u64 end, struct thandle *th,
+ struct lustre_capa *capa)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_device *osd = osd_obj2dev(obj);
+ udmu_objset_t *uos = &osd->od_objset;
+ struct osd_thandle *oh;
+ __u64 len;
+ int rc = 0;
+ ENTRY;
+
+ LASSERT(dt_object_exists(dt));
+ LASSERT(osd_invariant(obj));
+
+ LASSERT(th != NULL);
+ oh = container_of0(th, struct osd_thandle, ot_super);
+
+ cfs_write_lock(&obj->oo_attr_lock);
+ /* truncate */
+ if (end == OBD_OBJECT_EOF || end >= obj->oo_attr.la_size)
+ len = DMU_OBJECT_END;
+ else
+ len = end - start;
+ cfs_write_unlock(&obj->oo_attr_lock);
+
+ rc = __osd_object_punch(osd->od_objset.os, obj->oo_db, oh->ot_tx,
+ obj->oo_attr.la_size, start, len);
+ /* set new size */
+ if (len == DMU_OBJECT_END) {
+ cfs_write_lock(&obj->oo_attr_lock);
+ obj->oo_attr.la_size = start;
+ cfs_write_unlock(&obj->oo_attr_lock);
+ rc = osd_object_sa_update(obj, SA_ZPL_SIZE(uos),
+ &obj->oo_attr.la_size, 8, oh);
+ }
+ RETURN(rc);
+}
+
+static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
+ __u64 start, __u64 end, struct thandle *handle)
+{
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct osd_thandle *oh;
+ __u64 len;
+ ENTRY;
+
+ oh = container_of0(handle, struct osd_thandle, ot_super);
+
+ cfs_read_lock(&obj->oo_attr_lock);
+ if (end == OBD_OBJECT_EOF || end >= obj->oo_attr.la_size)
+ len = DMU_OBJECT_END;
+ else
+ len = end - start;
+
+ /* declare we'll free some blocks ... */
+ if (start < obj->oo_attr.la_size) {
+ cfs_read_unlock(&obj->oo_attr_lock);
+ dmu_tx_hold_free(oh->ot_tx, obj->oo_db->db_object, start, len);
+ } else {
+ cfs_read_unlock(&obj->oo_attr_lock);
+ }
+
+ /* ... and we'll modify size attribute */
+ dmu_tx_hold_sa(oh->ot_tx, obj->oo_sa_hdl, 0);
+
+ RETURN(0);
+}
+
+
+struct dt_body_operations osd_body_ops = {
+ .dbo_read = osd_read,
+ .dbo_declare_write = osd_declare_write,
+ .dbo_write = osd_write,
+ .dbo_bufs_get = osd_bufs_get,
+ .dbo_bufs_put = osd_bufs_put,
+ .dbo_write_prep = osd_write_prep,
+ .dbo_declare_write_commit = osd_declare_write_commit,
+ .dbo_write_commit = osd_write_commit,
+ .dbo_read_prep = osd_read_prep,
+ .do_declare_punch = osd_declare_punch,
+ .do_punch = osd_punch,
+};
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff