diff options
Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/dmu.c')
| -rw-r--r-- | sys/contrib/opensolaris/uts/common/fs/zfs/dmu.c | 1029 |
1 files changed, 0 insertions, 1029 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/dmu.c b/sys/contrib/opensolaris/uts/common/fs/zfs/dmu.c deleted file mode 100644 index d3be6b4ff22e2..0000000000000 --- a/sys/contrib/opensolaris/uts/common/fs/zfs/dmu.c +++ /dev/null @@ -1,1029 +0,0 @@ -/* - * CDDL HEADER START - * - * The contents of this file are subject to the terms of the - * Common Development and Distribution License (the "License"). - * You may not use this file except in compliance with the License. - * - * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE - * or http://www.opensolaris.org/os/licensing. - * See the License for the specific language governing permissions - * and limitations under the License. - * - * When distributing Covered Code, include this CDDL HEADER in each - * file and include the License file at usr/src/OPENSOLARIS.LICENSE. - * If applicable, add the following below this CDDL HEADER, with the - * fields enclosed by brackets "[]" replaced with your own identifying - * information: Portions Copyright [yyyy] [name of copyright owner] - * - * CDDL HEADER END - */ -/* - * Copyright 2007 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -#pragma ident "%Z%%M% %I% %E% SMI" - -#include <sys/dmu.h> -#include <sys/dmu_impl.h> -#include <sys/dmu_tx.h> -#include <sys/dbuf.h> -#include <sys/dnode.h> -#include <sys/zfs_context.h> -#include <sys/dmu_objset.h> -#include <sys/dmu_traverse.h> -#include <sys/dsl_dataset.h> -#include <sys/dsl_dir.h> -#include <sys/dsl_pool.h> -#include <sys/dsl_synctask.h> -#include <sys/dsl_prop.h> -#include <sys/dmu_zfetch.h> -#include <sys/zfs_ioctl.h> -#include <sys/zap.h> -#include <sys/zio_checksum.h> - -const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES] = { - { byteswap_uint8_array, TRUE, "unallocated" }, - { zap_byteswap, TRUE, "object directory" }, - { byteswap_uint64_array, TRUE, "object array" }, - { byteswap_uint8_array, TRUE, "packed nvlist" }, - { byteswap_uint64_array, TRUE, "packed nvlist size" }, - { byteswap_uint64_array, TRUE, "bplist" }, - { byteswap_uint64_array, TRUE, "bplist header" }, - { byteswap_uint64_array, TRUE, "SPA space map header" }, - { byteswap_uint64_array, TRUE, "SPA space map" }, - { byteswap_uint64_array, TRUE, "ZIL intent log" }, - { dnode_buf_byteswap, TRUE, "DMU dnode" }, - { dmu_objset_byteswap, TRUE, "DMU objset" }, - { byteswap_uint64_array, TRUE, "DSL directory" }, - { zap_byteswap, TRUE, "DSL directory child map"}, - { zap_byteswap, TRUE, "DSL dataset snap map" }, - { zap_byteswap, TRUE, "DSL props" }, - { byteswap_uint64_array, TRUE, "DSL dataset" }, - { zfs_znode_byteswap, TRUE, "ZFS znode" }, - { zfs_acl_byteswap, TRUE, "ZFS ACL" }, - { byteswap_uint8_array, FALSE, "ZFS plain file" }, - { zap_byteswap, TRUE, "ZFS directory" }, - { zap_byteswap, TRUE, "ZFS master node" }, - { zap_byteswap, TRUE, "ZFS delete queue" }, - { byteswap_uint8_array, FALSE, "zvol object" }, - { zap_byteswap, TRUE, "zvol prop" }, - { byteswap_uint8_array, FALSE, "other uint8[]" }, - { byteswap_uint64_array, FALSE, "other uint64[]" }, - { zap_byteswap, TRUE, "other ZAP" }, - { zap_byteswap, TRUE, "persistent error log" }, - { byteswap_uint8_array, TRUE, "SPA history" }, - { byteswap_uint64_array, TRUE, "SPA history offsets" }, - { zap_byteswap, TRUE, "Pool properties" }, -}; - -int -dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, - void *tag, dmu_buf_t **dbp) -{ - dnode_t *dn; - uint64_t blkid; - dmu_buf_impl_t *db; - int err; - - err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - blkid = dbuf_whichblock(dn, offset); - rw_enter(&dn->dn_struct_rwlock, RW_READER); - db = dbuf_hold(dn, blkid, tag); - rw_exit(&dn->dn_struct_rwlock); - if (db == NULL) { - err = EIO; - } else { - err = dbuf_read(db, NULL, DB_RF_CANFAIL); - if (err) { - dbuf_rele(db, tag); - db = NULL; - } - } - - dnode_rele(dn, FTAG); - *dbp = &db->db; - return (err); -} - -int -dmu_bonus_max(void) -{ - return (DN_MAX_BONUSLEN); -} - -/* - * returns ENOENT, EIO, or 0. - */ -int -dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **dbp) -{ - dnode_t *dn; - int err, count; - dmu_buf_impl_t *db; - - err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - - rw_enter(&dn->dn_struct_rwlock, RW_READER); - if (dn->dn_bonus == NULL) { - rw_exit(&dn->dn_struct_rwlock); - rw_enter(&dn->dn_struct_rwlock, RW_WRITER); - if (dn->dn_bonus == NULL) - dn->dn_bonus = dbuf_create_bonus(dn); - } - db = dn->dn_bonus; - rw_exit(&dn->dn_struct_rwlock); - mutex_enter(&db->db_mtx); - count = refcount_add(&db->db_holds, tag); - mutex_exit(&db->db_mtx); - if (count == 1) - dnode_add_ref(dn, db); - dnode_rele(dn, FTAG); - - VERIFY(0 == dbuf_read(db, NULL, DB_RF_MUST_SUCCEED)); - - *dbp = &db->db; - return (0); -} - -/* - * Note: longer-term, we should modify all of the dmu_buf_*() interfaces - * to take a held dnode rather than <os, object> -- the lookup is wasteful, - * and can induce severe lock contention when writing to several files - * whose dnodes are in the same block. - */ -static int -dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, - uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp) -{ - dmu_buf_t **dbp; - uint64_t blkid, nblks, i; - uint32_t flags; - int err; - zio_t *zio; - - ASSERT(length <= DMU_MAX_ACCESS); - - flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT; - if (length > zfetch_array_rd_sz) - flags |= DB_RF_NOPREFETCH; - - rw_enter(&dn->dn_struct_rwlock, RW_READER); - if (dn->dn_datablkshift) { - int blkshift = dn->dn_datablkshift; - nblks = (P2ROUNDUP(offset+length, 1ULL<<blkshift) - - P2ALIGN(offset, 1ULL<<blkshift)) >> blkshift; - } else { - if (offset + length > dn->dn_datablksz) { - zfs_panic_recover("zfs: accessing past end of object " - "%llx/%llx (size=%u access=%llu+%llu)", - (longlong_t)dn->dn_objset-> - os_dsl_dataset->ds_object, - (longlong_t)dn->dn_object, dn->dn_datablksz, - (longlong_t)offset, (longlong_t)length); - return (EIO); - } - nblks = 1; - } - dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_SLEEP); - - zio = zio_root(dn->dn_objset->os_spa, NULL, NULL, TRUE); - blkid = dbuf_whichblock(dn, offset); - for (i = 0; i < nblks; i++) { - dmu_buf_impl_t *db = dbuf_hold(dn, blkid+i, tag); - if (db == NULL) { - rw_exit(&dn->dn_struct_rwlock); - dmu_buf_rele_array(dbp, nblks, tag); - zio_nowait(zio); - return (EIO); - } - /* initiate async i/o */ - if (read) { - rw_exit(&dn->dn_struct_rwlock); - (void) dbuf_read(db, zio, flags); - rw_enter(&dn->dn_struct_rwlock, RW_READER); - } - dbp[i] = &db->db; - } - rw_exit(&dn->dn_struct_rwlock); - - /* wait for async i/o */ - err = zio_wait(zio); - if (err) { - dmu_buf_rele_array(dbp, nblks, tag); - return (err); - } - - /* wait for other io to complete */ - if (read) { - for (i = 0; i < nblks; i++) { - dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbp[i]; - mutex_enter(&db->db_mtx); - while (db->db_state == DB_READ || - db->db_state == DB_FILL) - cv_wait(&db->db_changed, &db->db_mtx); - if (db->db_state == DB_UNCACHED) - err = EIO; - mutex_exit(&db->db_mtx); - if (err) { - dmu_buf_rele_array(dbp, nblks, tag); - return (err); - } - } - } - - *numbufsp = nblks; - *dbpp = dbp; - return (0); -} - -static int -dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset, - uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp) -{ - dnode_t *dn; - int err; - - err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - - err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag, - numbufsp, dbpp); - - dnode_rele(dn, FTAG); - - return (err); -} - -int -dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, - uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp) -{ - dnode_t *dn = ((dmu_buf_impl_t *)db)->db_dnode; - int err; - - err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag, - numbufsp, dbpp); - - return (err); -} - -void -dmu_buf_rele_array(dmu_buf_t **dbp_fake, int numbufs, void *tag) -{ - int i; - dmu_buf_impl_t **dbp = (dmu_buf_impl_t **)dbp_fake; - - if (numbufs == 0) - return; - - for (i = 0; i < numbufs; i++) { - if (dbp[i]) - dbuf_rele(dbp[i], tag); - } - - kmem_free(dbp, sizeof (dmu_buf_t *) * numbufs); -} - -void -dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, uint64_t len) -{ - dnode_t *dn; - uint64_t blkid; - int nblks, i, err; - - if (zfs_prefetch_disable) - return; - - if (len == 0) { /* they're interested in the bonus buffer */ - dn = os->os->os_meta_dnode; - - if (object == 0 || object >= DN_MAX_OBJECT) - return; - - rw_enter(&dn->dn_struct_rwlock, RW_READER); - blkid = dbuf_whichblock(dn, object * sizeof (dnode_phys_t)); - dbuf_prefetch(dn, blkid); - rw_exit(&dn->dn_struct_rwlock); - return; - } - - /* - * XXX - Note, if the dnode for the requested object is not - * already cached, we will do a *synchronous* read in the - * dnode_hold() call. The same is true for any indirects. - */ - err = dnode_hold(os->os, object, FTAG, &dn); - if (err != 0) - return; - - rw_enter(&dn->dn_struct_rwlock, RW_READER); - if (dn->dn_datablkshift) { - int blkshift = dn->dn_datablkshift; - nblks = (P2ROUNDUP(offset+len, 1<<blkshift) - - P2ALIGN(offset, 1<<blkshift)) >> blkshift; - } else { - nblks = (offset < dn->dn_datablksz); - } - - if (nblks != 0) { - blkid = dbuf_whichblock(dn, offset); - for (i = 0; i < nblks; i++) - dbuf_prefetch(dn, blkid+i); - } - - rw_exit(&dn->dn_struct_rwlock); - - dnode_rele(dn, FTAG); -} - -int -dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, - uint64_t size, dmu_tx_t *tx) -{ - dnode_t *dn; - int err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - ASSERT(offset < UINT64_MAX); - ASSERT(size == -1ULL || size <= UINT64_MAX - offset); - dnode_free_range(dn, offset, size, tx); - dnode_rele(dn, FTAG); - return (0); -} - -int -dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, - void *buf) -{ - dnode_t *dn; - dmu_buf_t **dbp; - int numbufs, i, err; - - err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - - /* - * Deal with odd block sizes, where there can't be data past the first - * block. If we ever do the tail block optimization, we will need to - * handle that here as well. - */ - if (dn->dn_datablkshift == 0) { - int newsz = offset > dn->dn_datablksz ? 0 : - MIN(size, dn->dn_datablksz - offset); - bzero((char *)buf + newsz, size - newsz); - size = newsz; - } - - while (size > 0) { - uint64_t mylen = MIN(size, DMU_MAX_ACCESS / 2); - int err; - - /* - * NB: we could do this block-at-a-time, but it's nice - * to be reading in parallel. - */ - err = dmu_buf_hold_array_by_dnode(dn, offset, mylen, - TRUE, FTAG, &numbufs, &dbp); - if (err) - return (err); - - for (i = 0; i < numbufs; i++) { - int tocpy; - int bufoff; - dmu_buf_t *db = dbp[i]; - - ASSERT(size > 0); - - bufoff = offset - db->db_offset; - tocpy = (int)MIN(db->db_size - bufoff, size); - - bcopy((char *)db->db_data + bufoff, buf, tocpy); - - offset += tocpy; - size -= tocpy; - buf = (char *)buf + tocpy; - } - dmu_buf_rele_array(dbp, numbufs, FTAG); - } - dnode_rele(dn, FTAG); - return (0); -} - -void -dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, - const void *buf, dmu_tx_t *tx) -{ - dmu_buf_t **dbp; - int numbufs, i; - - if (size == 0) - return; - - VERIFY(0 == dmu_buf_hold_array(os, object, offset, size, - FALSE, FTAG, &numbufs, &dbp)); - - for (i = 0; i < numbufs; i++) { - int tocpy; - int bufoff; - dmu_buf_t *db = dbp[i]; - - ASSERT(size > 0); - - bufoff = offset - db->db_offset; - tocpy = (int)MIN(db->db_size - bufoff, size); - - ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size); - - if (tocpy == db->db_size) - dmu_buf_will_fill(db, tx); - else - dmu_buf_will_dirty(db, tx); - - bcopy(buf, (char *)db->db_data + bufoff, tocpy); - - if (tocpy == db->db_size) - dmu_buf_fill_done(db, tx); - - offset += tocpy; - size -= tocpy; - buf = (char *)buf + tocpy; - } - dmu_buf_rele_array(dbp, numbufs, FTAG); -} - -#ifdef _KERNEL -int -dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) -{ - dmu_buf_t **dbp; - int numbufs, i, err; - - /* - * NB: we could do this block-at-a-time, but it's nice - * to be reading in parallel. - */ - err = dmu_buf_hold_array(os, object, uio->uio_loffset, size, TRUE, FTAG, - &numbufs, &dbp); - if (err) - return (err); - - for (i = 0; i < numbufs; i++) { - int tocpy; - int bufoff; - dmu_buf_t *db = dbp[i]; - - ASSERT(size > 0); - - bufoff = uio->uio_loffset - db->db_offset; - tocpy = (int)MIN(db->db_size - bufoff, size); - - err = uiomove((char *)db->db_data + bufoff, tocpy, - UIO_READ, uio); - if (err) - break; - - size -= tocpy; - } - dmu_buf_rele_array(dbp, numbufs, FTAG); - - return (err); -} - -int -dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size, - dmu_tx_t *tx) -{ - dmu_buf_t **dbp; - int numbufs, i; - int err = 0; - - if (size == 0) - return (0); - - err = dmu_buf_hold_array(os, object, uio->uio_loffset, size, - FALSE, FTAG, &numbufs, &dbp); - if (err) - return (err); - - for (i = 0; i < numbufs; i++) { - int tocpy; - int bufoff; - dmu_buf_t *db = dbp[i]; - - ASSERT(size > 0); - - bufoff = uio->uio_loffset - db->db_offset; - tocpy = (int)MIN(db->db_size - bufoff, size); - - ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size); - - if (tocpy == db->db_size) - dmu_buf_will_fill(db, tx); - else - dmu_buf_will_dirty(db, tx); - - /* - * XXX uiomove could block forever (eg. nfs-backed - * pages). There needs to be a uiolockdown() function - * to lock the pages in memory, so that uiomove won't - * block. - */ - err = uiomove((char *)db->db_data + bufoff, tocpy, - UIO_WRITE, uio); - - if (tocpy == db->db_size) - dmu_buf_fill_done(db, tx); - - if (err) - break; - - size -= tocpy; - } - dmu_buf_rele_array(dbp, numbufs, FTAG); - return (err); -} - -#ifndef __FreeBSD__ -int -dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, - page_t *pp, dmu_tx_t *tx) -{ - dmu_buf_t **dbp; - int numbufs, i; - int err; - - if (size == 0) - return (0); - - err = dmu_buf_hold_array(os, object, offset, size, - FALSE, FTAG, &numbufs, &dbp); - if (err) - return (err); - - for (i = 0; i < numbufs; i++) { - int tocpy, copied, thiscpy; - int bufoff; - dmu_buf_t *db = dbp[i]; - caddr_t va; - - ASSERT(size > 0); - ASSERT3U(db->db_size, >=, PAGESIZE); - - bufoff = offset - db->db_offset; - tocpy = (int)MIN(db->db_size - bufoff, size); - - ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size); - - if (tocpy == db->db_size) - dmu_buf_will_fill(db, tx); - else - dmu_buf_will_dirty(db, tx); - - for (copied = 0; copied < tocpy; copied += PAGESIZE) { - ASSERT3U(pp->p_offset, ==, db->db_offset + bufoff); - thiscpy = MIN(PAGESIZE, tocpy - copied); - va = ppmapin(pp, PROT_READ, (caddr_t)-1); - bcopy(va, (char *)db->db_data + bufoff, thiscpy); - ppmapout(va); - pp = pp->p_next; - bufoff += PAGESIZE; - } - - if (tocpy == db->db_size) - dmu_buf_fill_done(db, tx); - - if (err) - break; - - offset += tocpy; - size -= tocpy; - } - dmu_buf_rele_array(dbp, numbufs, FTAG); - return (err); -} -#endif /* !__FreeBSD__ */ -#endif /* _KERNEL */ - -typedef struct { - dbuf_dirty_record_t *dr; - dmu_sync_cb_t *done; - void *arg; -} dmu_sync_arg_t; - -/* ARGSUSED */ -static void -dmu_sync_done(zio_t *zio, arc_buf_t *buf, void *varg) -{ - dmu_sync_arg_t *in = varg; - dbuf_dirty_record_t *dr = in->dr; - dmu_buf_impl_t *db = dr->dr_dbuf; - dmu_sync_cb_t *done = in->done; - - if (!BP_IS_HOLE(zio->io_bp)) { - zio->io_bp->blk_fill = 1; - BP_SET_TYPE(zio->io_bp, db->db_dnode->dn_type); - BP_SET_LEVEL(zio->io_bp, 0); - } - - mutex_enter(&db->db_mtx); - ASSERT(dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC); - dr->dt.dl.dr_overridden_by = *zio->io_bp; /* structure assignment */ - dr->dt.dl.dr_override_state = DR_OVERRIDDEN; - cv_broadcast(&db->db_changed); - mutex_exit(&db->db_mtx); - - if (done) - done(&(db->db), in->arg); - - kmem_free(in, sizeof (dmu_sync_arg_t)); -} - -/* - * Intent log support: sync the block associated with db to disk. - * N.B. and XXX: the caller is responsible for making sure that the - * data isn't changing while dmu_sync() is writing it. - * - * Return values: - * - * EEXIST: this txg has already been synced, so there's nothing to to. - * The caller should not log the write. - * - * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do. - * The caller should not log the write. - * - * EALREADY: this block is already in the process of being synced. - * The caller should track its progress (somehow). - * - * EINPROGRESS: the IO has been initiated. - * The caller should log this blkptr in the callback. - * - * 0: completed. Sets *bp to the blkptr just written. - * The caller should log this blkptr immediately. - */ -int -dmu_sync(zio_t *pio, dmu_buf_t *db_fake, - blkptr_t *bp, uint64_t txg, dmu_sync_cb_t *done, void *arg) -{ - dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; - objset_impl_t *os = db->db_objset; - dsl_pool_t *dp = os->os_dsl_dataset->ds_dir->dd_pool; - tx_state_t *tx = &dp->dp_tx; - dbuf_dirty_record_t *dr; - dmu_sync_arg_t *in; - zbookmark_t zb; - zio_t *zio; - int zio_flags; - int err; - - ASSERT(BP_IS_HOLE(bp)); - ASSERT(txg != 0); - - - dprintf("dmu_sync txg=%llu, s,o,q %llu %llu %llu\n", - txg, tx->tx_synced_txg, tx->tx_open_txg, tx->tx_quiesced_txg); - - /* - * XXX - would be nice if we could do this without suspending... - */ - txg_suspend(dp); - - /* - * If this txg already synced, there's nothing to do. - */ - if (txg <= tx->tx_synced_txg) { - txg_resume(dp); - /* - * If we're running ziltest, we need the blkptr regardless. - */ - if (txg > spa_freeze_txg(dp->dp_spa)) { - /* if db_blkptr == NULL, this was an empty write */ - if (db->db_blkptr) - *bp = *db->db_blkptr; /* structure assignment */ - return (0); - } - return (EEXIST); - } - - mutex_enter(&db->db_mtx); - - if (txg == tx->tx_syncing_txg) { - while (db->db_data_pending) { - /* - * IO is in-progress. Wait for it to finish. - * XXX - would be nice to be able to somehow "attach" - * this zio to the parent zio passed in. - */ - cv_wait(&db->db_changed, &db->db_mtx); - if (!db->db_data_pending && - db->db_blkptr && BP_IS_HOLE(db->db_blkptr)) { - /* - * IO was compressed away - */ - *bp = *db->db_blkptr; /* structure assignment */ - mutex_exit(&db->db_mtx); - txg_resume(dp); - return (0); - } - ASSERT(db->db_data_pending || - (db->db_blkptr && db->db_blkptr->blk_birth == txg)); - } - - if (db->db_blkptr && db->db_blkptr->blk_birth == txg) { - /* - * IO is already completed. - */ - *bp = *db->db_blkptr; /* structure assignment */ - mutex_exit(&db->db_mtx); - txg_resume(dp); - return (0); - } - } - - dr = db->db_last_dirty; - while (dr && dr->dr_txg > txg) - dr = dr->dr_next; - if (dr == NULL || dr->dr_txg < txg) { - /* - * This dbuf isn't dirty, must have been free_range'd. - * There's no need to log writes to freed blocks, so we're done. - */ - mutex_exit(&db->db_mtx); - txg_resume(dp); - return (ENOENT); - } - - ASSERT(dr->dr_txg == txg); - if (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { - /* - * We have already issued a sync write for this buffer. - */ - mutex_exit(&db->db_mtx); - txg_resume(dp); - return (EALREADY); - } else if (dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { - /* - * This buffer has already been synced. It could not - * have been dirtied since, or we would have cleared the state. - */ - *bp = dr->dt.dl.dr_overridden_by; /* structure assignment */ - mutex_exit(&db->db_mtx); - txg_resume(dp); - return (0); - } - - dr->dt.dl.dr_override_state = DR_IN_DMU_SYNC; - in = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP); - in->dr = dr; - in->done = done; - in->arg = arg; - mutex_exit(&db->db_mtx); - txg_resume(dp); - - zb.zb_objset = os->os_dsl_dataset->ds_object; - zb.zb_object = db->db.db_object; - zb.zb_level = db->db_level; - zb.zb_blkid = db->db_blkid; - zio_flags = ZIO_FLAG_MUSTSUCCEED; - if (dmu_ot[db->db_dnode->dn_type].ot_metadata || zb.zb_level != 0) - zio_flags |= ZIO_FLAG_METADATA; - zio = arc_write(pio, os->os_spa, - zio_checksum_select(db->db_dnode->dn_checksum, os->os_checksum), - zio_compress_select(db->db_dnode->dn_compress, os->os_compress), - dmu_get_replication_level(os, &zb, db->db_dnode->dn_type), - txg, bp, dr->dt.dl.dr_data, NULL, dmu_sync_done, in, - ZIO_PRIORITY_SYNC_WRITE, zio_flags, &zb); - - if (pio) { - zio_nowait(zio); - err = EINPROGRESS; - } else { - err = zio_wait(zio); - ASSERT(err == 0); - } - return (err); -} - -int -dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, int ibs, - dmu_tx_t *tx) -{ - dnode_t *dn; - int err; - - err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - err = dnode_set_blksz(dn, size, ibs, tx); - dnode_rele(dn, FTAG); - return (err); -} - -void -dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, - dmu_tx_t *tx) -{ - dnode_t *dn; - - /* XXX assumes dnode_hold will not get an i/o error */ - (void) dnode_hold(os->os, object, FTAG, &dn); - ASSERT(checksum < ZIO_CHECKSUM_FUNCTIONS); - dn->dn_checksum = checksum; - dnode_setdirty(dn, tx); - dnode_rele(dn, FTAG); -} - -void -dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, - dmu_tx_t *tx) -{ - dnode_t *dn; - - /* XXX assumes dnode_hold will not get an i/o error */ - (void) dnode_hold(os->os, object, FTAG, &dn); - ASSERT(compress < ZIO_COMPRESS_FUNCTIONS); - dn->dn_compress = compress; - dnode_setdirty(dn, tx); - dnode_rele(dn, FTAG); -} - -int -dmu_get_replication_level(objset_impl_t *os, - zbookmark_t *zb, dmu_object_type_t ot) -{ - int ncopies = os->os_copies; - - /* If it's the mos, it should have max copies set. */ - ASSERT(zb->zb_objset != 0 || - ncopies == spa_max_replication(os->os_spa)); - - if (dmu_ot[ot].ot_metadata || zb->zb_level != 0) - ncopies++; - return (MIN(ncopies, spa_max_replication(os->os_spa))); -} - -int -dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off) -{ - dnode_t *dn; - int i, err; - - err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - /* - * Sync any current changes before - * we go trundling through the block pointers. - */ - for (i = 0; i < TXG_SIZE; i++) { - if (list_link_active(&dn->dn_dirty_link[i])) - break; - } - if (i != TXG_SIZE) { - dnode_rele(dn, FTAG); - txg_wait_synced(dmu_objset_pool(os), 0); - err = dnode_hold(os->os, object, FTAG, &dn); - if (err) - return (err); - } - - err = dnode_next_offset(dn, hole, off, 1, 1, 0); - dnode_rele(dn, FTAG); - - return (err); -} - -void -dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi) -{ - rw_enter(&dn->dn_struct_rwlock, RW_READER); - mutex_enter(&dn->dn_mtx); - - doi->doi_data_block_size = dn->dn_datablksz; - doi->doi_metadata_block_size = dn->dn_indblkshift ? - 1ULL << dn->dn_indblkshift : 0; - doi->doi_indirection = dn->dn_nlevels; - doi->doi_checksum = dn->dn_checksum; - doi->doi_compress = dn->dn_compress; - doi->doi_physical_blks = (DN_USED_BYTES(dn->dn_phys) + - SPA_MINBLOCKSIZE/2) >> SPA_MINBLOCKSHIFT; - doi->doi_max_block_offset = dn->dn_phys->dn_maxblkid; - doi->doi_type = dn->dn_type; - doi->doi_bonus_size = dn->dn_bonuslen; - doi->doi_bonus_type = dn->dn_bonustype; - - mutex_exit(&dn->dn_mtx); - rw_exit(&dn->dn_struct_rwlock); -} - -/* - * Get information on a DMU object. - * If doi is NULL, just indicates whether the object exists. - */ -int -dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi) -{ - dnode_t *dn; - int err = dnode_hold(os->os, object, FTAG, &dn); - - if (err) - return (err); - - if (doi != NULL) - dmu_object_info_from_dnode(dn, doi); - - dnode_rele(dn, FTAG); - return (0); -} - -/* - * As above, but faster; can be used when you have a held dbuf in hand. - */ -void -dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi) -{ - dmu_object_info_from_dnode(((dmu_buf_impl_t *)db)->db_dnode, doi); -} - -/* - * Faster still when you only care about the size. - * This is specifically optimized for zfs_getattr(). - */ -void -dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, u_longlong_t *nblk512) -{ - dnode_t *dn = ((dmu_buf_impl_t *)db)->db_dnode; - - *blksize = dn->dn_datablksz; - /* add 1 for dnode space */ - *nblk512 = ((DN_USED_BYTES(dn->dn_phys) + SPA_MINBLOCKSIZE/2) >> - SPA_MINBLOCKSHIFT) + 1; -} - -void -byteswap_uint64_array(void *vbuf, size_t size) -{ - uint64_t *buf = vbuf; - size_t count = size >> 3; - int i; - - ASSERT((size & 7) == 0); - - for (i = 0; i < count; i++) - buf[i] = BSWAP_64(buf[i]); -} - -void -byteswap_uint32_array(void *vbuf, size_t size) -{ - uint32_t *buf = vbuf; - size_t count = size >> 2; - int i; - - ASSERT((size & 3) == 0); - - for (i = 0; i < count; i++) - buf[i] = BSWAP_32(buf[i]); -} - -void -byteswap_uint16_array(void *vbuf, size_t size) -{ - uint16_t *buf = vbuf; - size_t count = size >> 1; - int i; - - ASSERT((size & 1) == 0); - - for (i = 0; i < count; i++) - buf[i] = BSWAP_16(buf[i]); -} - -/* ARGSUSED */ -void -byteswap_uint8_array(void *vbuf, size_t size) -{ -} - -void -dmu_init(void) -{ - dbuf_init(); - dnode_init(); - arc_init(); -} - -void -dmu_fini(void) -{ - arc_fini(); - dnode_fini(); - dbuf_fini(); -} |