* CDDL HEADER END
*/
/*
- * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
- * Use is subject to license terms.
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
#include <sys/dmu.h>
#include <sys/zfs_ioctl.h>
#include <sys/zap.h>
#include <sys/zio_checksum.h>
+#include <sys/sa.h>
#ifdef _KERNEL
#include <sys/vmsystm.h>
#include <sys/zfs_znode.h>
#endif
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_oldacl_byteswap, TRUE, "ZFS V0 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" },
- { zap_byteswap, TRUE, "DSL permissions" },
- { zfs_acl_byteswap, TRUE, "ZFS ACL" },
- { byteswap_uint8_array, TRUE, "ZFS SYSACL" },
- { byteswap_uint8_array, TRUE, "FUID table" },
- { byteswap_uint64_array, TRUE, "FUID table size" },
- { zap_byteswap, TRUE, "DSL dataset next clones"},
- { zap_byteswap, TRUE, "scrub work queue" },
- { zap_byteswap, TRUE, "ZFS user/group used" },
- { zap_byteswap, TRUE, "ZFS user/group quota" },
+ { DMU_BSWAP_UINT8, TRUE, "unallocated" },
+ { DMU_BSWAP_ZAP, TRUE, "object directory" },
+ { DMU_BSWAP_UINT64, TRUE, "object array" },
+ { DMU_BSWAP_UINT8, TRUE, "packed nvlist" },
+ { DMU_BSWAP_UINT64, TRUE, "packed nvlist size" },
+ { DMU_BSWAP_UINT64, TRUE, "bpobj" },
+ { DMU_BSWAP_UINT64, TRUE, "bpobj header" },
+ { DMU_BSWAP_UINT64, TRUE, "SPA space map header" },
+ { DMU_BSWAP_UINT64, TRUE, "SPA space map" },
+ { DMU_BSWAP_UINT64, TRUE, "ZIL intent log" },
+ { DMU_BSWAP_DNODE, TRUE, "DMU dnode" },
+ { DMU_BSWAP_OBJSET, TRUE, "DMU objset" },
+ { DMU_BSWAP_UINT64, TRUE, "DSL directory" },
+ { DMU_BSWAP_ZAP, TRUE, "DSL directory child map"},
+ { DMU_BSWAP_ZAP, TRUE, "DSL dataset snap map" },
+ { DMU_BSWAP_ZAP, TRUE, "DSL props" },
+ { DMU_BSWAP_UINT64, TRUE, "DSL dataset" },
+ { DMU_BSWAP_ZNODE, TRUE, "ZFS znode" },
+ { DMU_BSWAP_OLDACL, TRUE, "ZFS V0 ACL" },
+ { DMU_BSWAP_UINT8, FALSE, "ZFS plain file" },
+ { DMU_BSWAP_ZAP, TRUE, "ZFS directory" },
+ { DMU_BSWAP_ZAP, TRUE, "ZFS master node" },
+ { DMU_BSWAP_ZAP, TRUE, "ZFS delete queue" },
+ { DMU_BSWAP_UINT8, FALSE, "zvol object" },
+ { DMU_BSWAP_ZAP, TRUE, "zvol prop" },
+ { DMU_BSWAP_UINT8, FALSE, "other uint8[]" },
+ { DMU_BSWAP_UINT64, FALSE, "other uint64[]" },
+ { DMU_BSWAP_ZAP, TRUE, "other ZAP" },
+ { DMU_BSWAP_ZAP, TRUE, "persistent error log" },
+ { DMU_BSWAP_UINT8, TRUE, "SPA history" },
+ { DMU_BSWAP_UINT64, TRUE, "SPA history offsets" },
+ { DMU_BSWAP_ZAP, TRUE, "Pool properties" },
+ { DMU_BSWAP_ZAP, TRUE, "DSL permissions" },
+ { DMU_BSWAP_ACL, TRUE, "ZFS ACL" },
+ { DMU_BSWAP_UINT8, TRUE, "ZFS SYSACL" },
+ { DMU_BSWAP_UINT8, TRUE, "FUID table" },
+ { DMU_BSWAP_UINT64, TRUE, "FUID table size" },
+ { DMU_BSWAP_ZAP, TRUE, "DSL dataset next clones"},
+ { DMU_BSWAP_ZAP, TRUE, "scan work queue" },
+ { DMU_BSWAP_ZAP, TRUE, "ZFS user/group used" },
+ { DMU_BSWAP_ZAP, TRUE, "ZFS user/group quota" },
+ { DMU_BSWAP_ZAP, TRUE, "snapshot refcount tags"},
+ { DMU_BSWAP_ZAP, TRUE, "DDT ZAP algorithm" },
+ { DMU_BSWAP_ZAP, TRUE, "DDT statistics" },
+ { DMU_BSWAP_UINT8, TRUE, "System attributes" },
+ { DMU_BSWAP_ZAP, TRUE, "SA master node" },
+ { DMU_BSWAP_ZAP, TRUE, "SA attr registration" },
+ { DMU_BSWAP_ZAP, TRUE, "SA attr layouts" },
+ { DMU_BSWAP_ZAP, TRUE, "scan translations" },
+ { DMU_BSWAP_UINT8, FALSE, "deduplicated block" },
+ { DMU_BSWAP_ZAP, TRUE, "DSL deadlist map" },
+ { DMU_BSWAP_UINT64, TRUE, "DSL deadlist map hdr" },
+ { DMU_BSWAP_ZAP, TRUE, "DSL dir clones" },
+ { DMU_BSWAP_UINT64, TRUE, "bpobj subobj" }
+};
+
+const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS] = {
+ { byteswap_uint8_array, "uint8" },
+ { byteswap_uint16_array, "uint16" },
+ { byteswap_uint32_array, "uint32" },
+ { byteswap_uint64_array, "uint64" },
+ { zap_byteswap, "zap" },
+ { dnode_buf_byteswap, "dnode" },
+ { dmu_objset_byteswap, "objset" },
+ { zfs_znode_byteswap, "znode" },
+ { zfs_oldacl_byteswap, "oldacl" },
+ { zfs_acl_byteswap, "acl" }
};
int
dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
- void *tag, dmu_buf_t **dbp)
+ void *tag, dmu_buf_t **dbp, int flags)
{
dnode_t *dn;
uint64_t blkid;
dmu_buf_impl_t *db;
int err;
+ int db_flags = DB_RF_CANFAIL;
- err = dnode_hold(os->os, object, FTAG, &dn);
+ if (flags & DMU_READ_NO_PREFETCH)
+ db_flags |= DB_RF_NOPREFETCH;
+
+ err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
blkid = dbuf_whichblock(dn, offset);
if (db == NULL) {
err = EIO;
} else {
- err = dbuf_read(db, NULL, DB_RF_CANFAIL);
+ err = dbuf_read(db, NULL, db_flags);
if (err) {
dbuf_rele(db, tag);
db = NULL;
}
dnode_rele(dn, FTAG);
- *dbp = &db->db;
+ *dbp = &db->db; /* NULL db plus first field offset is NULL */
return (err);
}
}
int
-dmu_set_bonus(dmu_buf_t *db, int newsize, dmu_tx_t *tx)
+dmu_set_bonus(dmu_buf_t *db_fake, int newsize, dmu_tx_t *tx)
{
- dnode_t *dn = ((dmu_buf_impl_t *)db)->db_dnode;
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
+ dnode_t *dn;
+ int error;
- if (dn->dn_bonus != (dmu_buf_impl_t *)db)
- return (EINVAL);
- if (newsize < 0 || newsize > db->db_size)
- return (EINVAL);
- dnode_setbonuslen(dn, newsize, tx);
- return (0);
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+
+ if (dn->dn_bonus != db) {
+ error = EINVAL;
+ } else if (newsize < 0 || newsize > db_fake->db_size) {
+ error = EINVAL;
+ } else {
+ dnode_setbonuslen(dn, newsize, tx);
+ error = 0;
+ }
+
+ DB_DNODE_EXIT(db);
+ return (error);
+}
+
+int
+dmu_set_bonustype(dmu_buf_t *db_fake, dmu_object_type_t type, dmu_tx_t *tx)
+{
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
+ dnode_t *dn;
+ int error;
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+
+ if (!DMU_OT_IS_VALID(type)) {
+ error = EINVAL;
+ } else if (dn->dn_bonus != db) {
+ error = EINVAL;
+ } else {
+ dnode_setbonus_type(dn, type, tx);
+ error = 0;
+ }
+
+ DB_DNODE_EXIT(db);
+ return (error);
+}
+
+dmu_object_type_t
+dmu_get_bonustype(dmu_buf_t *db_fake)
+{
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
+ dnode_t *dn;
+ dmu_object_type_t type;
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+ type = dn->dn_bonustype;
+ DB_DNODE_EXIT(db);
+
+ return (type);
+}
+
+int
+dmu_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx)
+{
+ dnode_t *dn;
+ int error;
+
+ error = dnode_hold(os, object, FTAG, &dn);
+ dbuf_rm_spill(dn, tx);
+ rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
+ dnode_rm_spill(dn, tx);
+ rw_exit(&dn->dn_struct_rwlock);
+ dnode_rele(dn, FTAG);
+ return (error);
}
/*
dmu_buf_impl_t *db;
int error;
- error = dnode_hold(os->os, object, FTAG, &dn);
+ error = dnode_hold(os, object, FTAG, &dn);
if (error)
return (error);
dbuf_create_bonus(dn);
}
db = dn->dn_bonus;
- rw_exit(&dn->dn_struct_rwlock);
/* as long as the bonus buf is held, the dnode will be held */
- if (refcount_add(&db->db_holds, tag) == 1)
+ if (refcount_add(&db->db_holds, tag) == 1) {
VERIFY(dnode_add_ref(dn, db));
+ (void) atomic_inc_32_nv(&dn->dn_dbufs_count);
+ }
+
+ /*
+ * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
+ * hold and incrementing the dbuf count to ensure that dnode_move() sees
+ * a dnode hold for every dbuf.
+ */
+ rw_exit(&dn->dn_struct_rwlock);
dnode_rele(dn, FTAG);
- VERIFY(0 == dbuf_read(db, NULL, DB_RF_MUST_SUCCEED));
+ VERIFY(0 == dbuf_read(db, NULL, DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH));
*dbp = &db->db;
return (0);
}
/*
+ * returns ENOENT, EIO, or 0.
+ *
+ * This interface will allocate a blank spill dbuf when a spill blk
+ * doesn't already exist on the dnode.
+ *
+ * if you only want to find an already existing spill db, then
+ * dmu_spill_hold_existing() should be used.
+ */
+int
+dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags, void *tag, dmu_buf_t **dbp)
+{
+ dmu_buf_impl_t *db = NULL;
+ int err;
+
+ if ((flags & DB_RF_HAVESTRUCT) == 0)
+ rw_enter(&dn->dn_struct_rwlock, RW_READER);
+
+ db = dbuf_hold(dn, DMU_SPILL_BLKID, tag);
+
+ if ((flags & DB_RF_HAVESTRUCT) == 0)
+ rw_exit(&dn->dn_struct_rwlock);
+
+ ASSERT(db != NULL);
+ err = dbuf_read(db, NULL, flags);
+ if (err == 0)
+ *dbp = &db->db;
+ else
+ dbuf_rele(db, tag);
+ return (err);
+}
+
+int
+dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
+{
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
+ dnode_t *dn;
+ int err;
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+
+ if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_SA) {
+ err = EINVAL;
+ } else {
+ rw_enter(&dn->dn_struct_rwlock, RW_READER);
+
+ if (!dn->dn_have_spill) {
+ err = ENOENT;
+ } else {
+ err = dmu_spill_hold_by_dnode(dn,
+ DB_RF_HAVESTRUCT | DB_RF_CANFAIL, tag, dbp);
+ }
+
+ rw_exit(&dn->dn_struct_rwlock);
+ }
+
+ DB_DNODE_EXIT(db);
+ return (err);
+}
+
+int
+dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
+{
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
+ dnode_t *dn;
+ int err;
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+ err = dmu_spill_hold_by_dnode(dn, DB_RF_CANFAIL, tag, dbp);
+ DB_DNODE_EXIT(db);
+
+ return (err);
+}
+
+/*
* 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
uint32_t dbuf_flags;
int err;
zio_t *zio;
- hrtime_t start;
+ hrtime_t start = 0;
ASSERT(length <= DMU_MAX_ACCESS);
- dbuf_flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT;
+ dbuf_flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT | DB_RF_HAVESTRUCT;
if (flags & DMU_READ_NO_PREFETCH || length > zfetch_array_rd_sz)
dbuf_flags |= DB_RF_NOPREFETCH;
os_dsl_dataset->ds_object,
(longlong_t)dn->dn_object, dn->dn_datablksz,
(longlong_t)offset, (longlong_t)length);
+ rw_exit(&dn->dn_struct_rwlock);
return (EIO);
}
nblks = 1;
}
- dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_SLEEP);
+ dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_PUSHPAGE | KM_NODEBUG);
if (dn->dn_objset->os_dsl_dataset)
dp = dn->dn_objset->os_dsl_dataset->ds_dir->dd_pool;
}
/* initiate async i/o */
if (read) {
- rw_exit(&dn->dn_struct_rwlock);
(void) dbuf_read(db, zio, dbuf_flags);
- rw_enter(&dn->dn_struct_rwlock, RW_READER);
}
dbp[i] = &db->db;
}
dnode_t *dn;
int err;
- err = dnode_hold(os->os, object, FTAG, &dn);
+ err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
}
int
-dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset,
+dmu_buf_hold_array_by_bonus(dmu_buf_t *db_fake, 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;
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
+ dnode_t *dn;
int err;
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
numbufsp, dbpp, DMU_READ_PREFETCH);
+ DB_DNODE_EXIT(db);
return (err);
}
return;
if (len == 0) { /* they're interested in the bonus buffer */
- dn = os->os->os_meta_dnode;
+ dn = DMU_META_DNODE(os);
if (object == 0 || object >= DN_MAX_OBJECT)
return;
* 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);
+ err = dnode_hold(os, object, FTAG, &dn);
if (err != 0)
return;
dnode_rele(dn, FTAG);
}
+/*
+ * Get the next "chunk" of file data to free. We traverse the file from
+ * the end so that the file gets shorter over time (if we crashes in the
+ * middle, this will leave us in a better state). We find allocated file
+ * data by simply searching the allocated level 1 indirects.
+ */
static int
-get_next_chunk(dnode_t *dn, uint64_t *offset, uint64_t limit)
+get_next_chunk(dnode_t *dn, uint64_t *start, uint64_t limit)
{
- uint64_t len = *offset - limit;
- uint64_t chunk_len = dn->dn_datablksz * DMU_MAX_DELETEBLKCNT;
- uint64_t subchunk =
+ uint64_t len = *start - limit;
+ uint64_t blkcnt = 0;
+ uint64_t maxblks = DMU_MAX_ACCESS / (1ULL << (dn->dn_indblkshift + 1));
+ uint64_t iblkrange =
dn->dn_datablksz * EPB(dn->dn_indblkshift, SPA_BLKPTRSHIFT);
- ASSERT(limit <= *offset);
+ ASSERT(limit <= *start);
- if (len <= chunk_len) {
- *offset = limit;
+ if (len <= iblkrange * maxblks) {
+ *start = limit;
return (0);
}
+ ASSERT(ISP2(iblkrange));
- ASSERT(ISP2(subchunk));
-
- while (*offset > limit) {
- uint64_t initial_offset = P2ROUNDUP(*offset, subchunk);
- uint64_t delta;
+ while (*start > limit && blkcnt < maxblks) {
int err;
- /* skip over allocated data */
+ /* find next allocated L1 indirect */
err = dnode_next_offset(dn,
- DNODE_FIND_HOLE|DNODE_FIND_BACKWARDS, offset, 1, 1, 0);
- if (err == ESRCH)
- *offset = limit;
- else if (err)
- return (err);
+ DNODE_FIND_BACKWARDS, start, 2, 1, 0);
- ASSERT3U(*offset, <=, initial_offset);
- *offset = P2ALIGN(*offset, subchunk);
- delta = initial_offset - *offset;
- if (delta >= chunk_len) {
- *offset += delta - chunk_len;
+ /* if there are no more, then we are done */
+ if (err == ESRCH) {
+ *start = limit;
return (0);
- }
- chunk_len -= delta;
-
- /* skip over unallocated data */
- err = dnode_next_offset(dn,
- DNODE_FIND_BACKWARDS, offset, 1, 1, 0);
- if (err == ESRCH)
- *offset = limit;
- else if (err)
+ } else if (err) {
return (err);
+ }
+ blkcnt += 1;
- if (*offset < limit)
- *offset = limit;
- ASSERT3U(*offset, <, initial_offset);
+ /* reset offset to end of "next" block back */
+ *start = P2ALIGN(*start, iblkrange);
+ if (*start <= limit)
+ *start = limit;
+ else
+ *start -= 1;
}
return (0);
}
dnode_t *dn;
int err;
- err = dnode_hold(os->os, object, FTAG, &dn);
+ err = dnode_hold(os, object, FTAG, &dn);
if (err != 0)
return (err);
err = dmu_free_long_range_impl(os, dn, offset, length, FALSE);
dmu_tx_t *tx;
int err;
- err = dnode_hold_impl(os->os, object, DNODE_MUST_BE_ALLOCATED,
+ err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
FTAG, &dn);
if (err != 0)
return (err);
uint64_t size, dmu_tx_t *tx)
{
dnode_t *dn;
- int err = dnode_hold(os->os, object, FTAG, &dn);
+ int err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
ASSERT(offset < UINT64_MAX);
{
dnode_t *dn;
dmu_buf_t **dbp;
- int numbufs, i, err;
+ int numbufs, err;
- err = dnode_hold(os->os, object, FTAG, &dn);
+ err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
* block. If we ever do the tail block optimization, we will need to
* handle that here as well.
*/
- if (dn->dn_datablkshift == 0) {
+ if (dn->dn_maxblkid == 0) {
int newsz = offset > dn->dn_datablksz ? 0 :
MIN(size, dn->dn_datablksz - offset);
bzero((char *)buf + newsz, size - newsz);
while (size > 0) {
uint64_t mylen = MIN(size, DMU_MAX_ACCESS / 2);
+ int i;
/*
* NB: we could do this block-at-a-time, but it's nice
else
dmu_buf_will_dirty(db, tx);
- bcopy(buf, (char *)db->db_data + bufoff, tocpy);
+ (void) memcpy((char *)db->db_data + bufoff, buf, tocpy);
if (tocpy == db->db_size)
dmu_buf_fill_done(db, tx);
dmu_buf_rele_array(dbp, numbufs, FTAG);
}
+/*
+ * DMU support for xuio
+ */
+kstat_t *xuio_ksp = NULL;
+
+typedef struct xuio_stats {
+ /* loaned yet not returned arc_buf */
+ kstat_named_t xuiostat_onloan_rbuf;
+ kstat_named_t xuiostat_onloan_wbuf;
+ /* whether a copy is made when loaning out a read buffer */
+ kstat_named_t xuiostat_rbuf_copied;
+ kstat_named_t xuiostat_rbuf_nocopy;
+ /* whether a copy is made when assigning a write buffer */
+ kstat_named_t xuiostat_wbuf_copied;
+ kstat_named_t xuiostat_wbuf_nocopy;
+} xuio_stats_t;
+
+static xuio_stats_t xuio_stats = {
+ { "onloan_read_buf", KSTAT_DATA_UINT64 },
+ { "onloan_write_buf", KSTAT_DATA_UINT64 },
+ { "read_buf_copied", KSTAT_DATA_UINT64 },
+ { "read_buf_nocopy", KSTAT_DATA_UINT64 },
+ { "write_buf_copied", KSTAT_DATA_UINT64 },
+ { "write_buf_nocopy", KSTAT_DATA_UINT64 }
+};
+
+#define XUIOSTAT_INCR(stat, val) \
+ atomic_add_64(&xuio_stats.stat.value.ui64, (val))
+#define XUIOSTAT_BUMP(stat) XUIOSTAT_INCR(stat, 1)
+
+int
+dmu_xuio_init(xuio_t *xuio, int nblk)
+{
+ dmu_xuio_t *priv;
+ uio_t *uio = &xuio->xu_uio;
+
+ uio->uio_iovcnt = nblk;
+ uio->uio_iov = kmem_zalloc(nblk * sizeof (iovec_t), KM_PUSHPAGE);
+
+ priv = kmem_zalloc(sizeof (dmu_xuio_t), KM_PUSHPAGE);
+ priv->cnt = nblk;
+ priv->bufs = kmem_zalloc(nblk * sizeof (arc_buf_t *), KM_PUSHPAGE);
+ priv->iovp = uio->uio_iov;
+ XUIO_XUZC_PRIV(xuio) = priv;
+
+ if (XUIO_XUZC_RW(xuio) == UIO_READ)
+ XUIOSTAT_INCR(xuiostat_onloan_rbuf, nblk);
+ else
+ XUIOSTAT_INCR(xuiostat_onloan_wbuf, nblk);
+
+ return (0);
+}
+
+void
+dmu_xuio_fini(xuio_t *xuio)
+{
+ dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
+ int nblk = priv->cnt;
+
+ kmem_free(priv->iovp, nblk * sizeof (iovec_t));
+ kmem_free(priv->bufs, nblk * sizeof (arc_buf_t *));
+ kmem_free(priv, sizeof (dmu_xuio_t));
+
+ if (XUIO_XUZC_RW(xuio) == UIO_READ)
+ XUIOSTAT_INCR(xuiostat_onloan_rbuf, -nblk);
+ else
+ XUIOSTAT_INCR(xuiostat_onloan_wbuf, -nblk);
+}
+
+/*
+ * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf }
+ * and increase priv->next by 1.
+ */
+int
+dmu_xuio_add(xuio_t *xuio, arc_buf_t *abuf, offset_t off, size_t n)
+{
+ struct iovec *iov;
+ uio_t *uio = &xuio->xu_uio;
+ dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
+ int i = priv->next++;
+
+ ASSERT(i < priv->cnt);
+ ASSERT(off + n <= arc_buf_size(abuf));
+ iov = uio->uio_iov + i;
+ iov->iov_base = (char *)abuf->b_data + off;
+ iov->iov_len = n;
+ priv->bufs[i] = abuf;
+ return (0);
+}
+
+int
+dmu_xuio_cnt(xuio_t *xuio)
+{
+ dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
+ return (priv->cnt);
+}
+
+arc_buf_t *
+dmu_xuio_arcbuf(xuio_t *xuio, int i)
+{
+ dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
+
+ ASSERT(i < priv->cnt);
+ return (priv->bufs[i]);
+}
+
+void
+dmu_xuio_clear(xuio_t *xuio, int i)
+{
+ dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
+
+ ASSERT(i < priv->cnt);
+ priv->bufs[i] = NULL;
+}
+
+static void
+xuio_stat_init(void)
+{
+ xuio_ksp = kstat_create("zfs", 0, "xuio_stats", "misc",
+ KSTAT_TYPE_NAMED, sizeof (xuio_stats) / sizeof (kstat_named_t),
+ KSTAT_FLAG_VIRTUAL);
+ if (xuio_ksp != NULL) {
+ xuio_ksp->ks_data = &xuio_stats;
+ kstat_install(xuio_ksp);
+ }
+}
+
+static void
+xuio_stat_fini(void)
+{
+ if (xuio_ksp != NULL) {
+ kstat_delete(xuio_ksp);
+ xuio_ksp = NULL;
+ }
+}
+
+void
+xuio_stat_wbuf_copied()
+{
+ XUIOSTAT_BUMP(xuiostat_wbuf_copied);
+}
+
+void
+xuio_stat_wbuf_nocopy()
+{
+ XUIOSTAT_BUMP(xuiostat_wbuf_nocopy);
+}
+
#ifdef _KERNEL
+
+/*
+ * Copy up to size bytes between arg_buf and req based on the data direction
+ * described by the req. If an entire req's data cannot be transfered the
+ * req's is updated such that it's current index and bv offsets correctly
+ * reference any residual data which could not be copied. The return value
+ * is the number of bytes successfully copied to arg_buf.
+ */
+static int
+dmu_req_copy(void *arg_buf, int size, int *offset, struct request *req)
+{
+ struct bio_vec *bv;
+ struct req_iterator iter;
+ char *bv_buf;
+ int tocpy;
+
+ *offset = 0;
+ rq_for_each_segment(bv, req, iter) {
+
+ /* Fully consumed the passed arg_buf */
+ ASSERT3S(*offset, <=, size);
+ if (size == *offset)
+ break;
+
+ /* Skip fully consumed bv's */
+ if (bv->bv_len == 0)
+ continue;
+
+ tocpy = MIN(bv->bv_len, size - *offset);
+ ASSERT3S(tocpy, >=, 0);
+
+ bv_buf = page_address(bv->bv_page) + bv->bv_offset;
+ ASSERT3P(bv_buf, !=, NULL);
+
+ if (rq_data_dir(req) == WRITE)
+ memcpy(arg_buf + *offset, bv_buf, tocpy);
+ else
+ memcpy(bv_buf, arg_buf + *offset, tocpy);
+
+ *offset += tocpy;
+ bv->bv_offset += tocpy;
+ bv->bv_len -= tocpy;
+ }
+
+ return 0;
+}
+
+static void
+dmu_bio_put(struct bio *bio)
+{
+ struct bio *bio_next;
+
+ while (bio) {
+ bio_next = bio->bi_next;
+ bio_put(bio);
+ bio = bio_next;
+ }
+}
+
+static int
+dmu_bio_clone(struct bio *bio, struct bio **bio_copy)
+{
+ struct bio *bio_root = NULL;
+ struct bio *bio_last = NULL;
+ struct bio *bio_new;
+
+ if (bio == NULL)
+ return EINVAL;
+
+ while (bio) {
+ bio_new = bio_clone(bio, GFP_NOIO);
+ if (bio_new == NULL) {
+ dmu_bio_put(bio_root);
+ return ENOMEM;
+ }
+
+ if (bio_last) {
+ bio_last->bi_next = bio_new;
+ bio_last = bio_new;
+ } else {
+ bio_root = bio_new;
+ bio_last = bio_new;
+ }
+
+ bio = bio->bi_next;
+ }
+
+ *bio_copy = bio_root;
+
+ return 0;
+}
+
int
-dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
+dmu_read_req(objset_t *os, uint64_t object, struct request *req)
{
+ uint64_t size = blk_rq_bytes(req);
+ uint64_t offset = blk_rq_pos(req) << 9;
+ struct bio *bio_saved = req->bio;
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);
+ err = dmu_buf_hold_array(os, object, offset, size, TRUE, FTAG,
+ &numbufs, &dbp);
if (err)
return (err);
+ /*
+ * Clone the bio list so the bv->bv_offset and bv->bv_len members
+ * can be safely modified. The original bio list is relinked in to
+ * the request when the function exits. This is required because
+ * some file systems blindly assume that these values will remain
+ * constant between bio_submit() and the IO completion callback.
+ */
+ err = dmu_bio_clone(bio_saved, &req->bio);
+ if (err)
+ goto error;
+
for (i = 0; i < numbufs; i++) {
- int tocpy;
- int bufoff;
+ int tocpy, didcpy, bufoff;
dmu_buf_t *db = dbp[i];
- ASSERT(size > 0);
+ bufoff = offset - db->db_offset;
+ ASSERT3S(bufoff, >=, 0);
- bufoff = uio->uio_loffset - db->db_offset;
tocpy = (int)MIN(db->db_size - bufoff, size);
+ if (tocpy == 0)
+ break;
+
+ err = dmu_req_copy(db->db_data + bufoff, tocpy, &didcpy, req);
+
+ if (didcpy < tocpy)
+ err = EIO;
- err = uiomove((char *)db->db_data + bufoff, tocpy,
- UIO_READ, uio);
if (err)
break;
size -= tocpy;
+ offset += didcpy;
+ err = 0;
}
+
+ dmu_bio_put(req->bio);
+ req->bio = bio_saved;
+error:
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_write_req(objset_t *os, uint64_t object, struct request *req, dmu_tx_t *tx)
{
+ uint64_t size = blk_rq_bytes(req);
+ uint64_t offset = blk_rq_pos(req) << 9;
+ struct bio *bio_saved = req->bio;
dmu_buf_t **dbp;
- int numbufs, i;
+ int numbufs;
int err = 0;
+ int i;
if (size == 0)
return (0);
- err = dmu_buf_hold_array(os, object, uio->uio_loffset, size,
- FALSE, FTAG, &numbufs, &dbp);
+ err = dmu_buf_hold_array(os, object, offset, size, FALSE, FTAG,
+ &numbufs, &dbp);
if (err)
return (err);
+ /*
+ * Clone the bio list so the bv->bv_offset and bv->bv_len members
+ * can be safely modified. The original bio list is relinked in to
+ * the request when the function exits. This is required because
+ * some file systems blindly assume that these values will remain
+ * constant between bio_submit() and the IO completion callback.
+ */
+ err = dmu_bio_clone(bio_saved, &req->bio);
+ if (err)
+ goto error;
+
for (i = 0; i < numbufs; i++) {
- int tocpy;
- int bufoff;
+ int tocpy, didcpy, bufoff;
dmu_buf_t *db = dbp[i];
- ASSERT(size > 0);
+ bufoff = offset - db->db_offset;
+ ASSERT3S(bufoff, >=, 0);
- bufoff = uio->uio_loffset - db->db_offset;
tocpy = (int)MIN(db->db_size - bufoff, size);
+ if (tocpy == 0)
+ break;
ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
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);
+ err = dmu_req_copy(db->db_data + bufoff, tocpy, &didcpy, req);
if (tocpy == db->db_size)
dmu_buf_fill_done(db, tx);
+ if (didcpy < tocpy)
+ err = EIO;
+
if (err)
break;
size -= tocpy;
+ offset += didcpy;
+ err = 0;
}
+
+ dmu_bio_put(req->bio);
+ req->bio = bio_saved;
+error:
dmu_buf_rele_array(dbp, numbufs, FTAG);
+
return (err);
}
int
-dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
- page_t *pp, dmu_tx_t *tx)
+dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
{
dmu_buf_t **dbp;
- int numbufs, i;
- int err;
+ int numbufs, i, err;
+ xuio_t *xuio = NULL;
- if (size == 0)
- return (0);
+ /*
+ * 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);
+
+ if (xuio) {
+ dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
+ arc_buf_t *dbuf_abuf = dbi->db_buf;
+ arc_buf_t *abuf = dbuf_loan_arcbuf(dbi);
+ err = dmu_xuio_add(xuio, abuf, bufoff, tocpy);
+ if (!err) {
+ uio->uio_resid -= tocpy;
+ uio->uio_loffset += tocpy;
+ }
+
+ if (abuf == dbuf_abuf)
+ XUIOSTAT_BUMP(xuiostat_rbuf_nocopy);
+ else
+ XUIOSTAT_BUMP(xuiostat_rbuf_copied);
+ } else {
+ 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);
+}
+
+static int
+dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx)
+{
+ dmu_buf_t **dbp;
+ int numbufs;
+ int err = 0;
+ int i;
- err = dmu_buf_hold_array(os, object, offset, size,
- FALSE, FTAG, &numbufs, &dbp);
+ err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size,
+ FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH);
if (err)
return (err);
for (i = 0; i < numbufs; i++) {
- int tocpy, copied, thiscpy;
+ int tocpy;
int bufoff;
dmu_buf_t *db = dbp[i];
- caddr_t va;
ASSERT(size > 0);
- ASSERT3U(db->db_size, >=, PAGESIZE);
- bufoff = offset - db->db_offset;
+ 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);
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 = zfs_map_page(pp, S_READ);
- bcopy(va, (char *)db->db_data + bufoff, thiscpy);
- zfs_unmap_page(pp, va);
- pp = pp->p_next;
- bufoff += PAGESIZE;
- }
+ /*
+ * 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;
- offset += tocpy;
size -= tocpy;
}
+
dmu_buf_rele_array(dbp, numbufs, FTAG);
return (err);
}
-#endif
+
+int
+dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size,
+ dmu_tx_t *tx)
+{
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb;
+ dnode_t *dn;
+ int err;
+
+ if (size == 0)
+ return (0);
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+ err = dmu_write_uio_dnode(dn, uio, size, tx);
+ DB_DNODE_EXIT(db);
+
+ return (err);
+}
+
+int
+dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size,
+ dmu_tx_t *tx)
+{
+ dnode_t *dn;
+ int err;
+
+ if (size == 0)
+ return (0);
+
+ err = dnode_hold(os, object, FTAG, &dn);
+ if (err)
+ return (err);
+
+ err = dmu_write_uio_dnode(dn, uio, size, tx);
+
+ dnode_rele(dn, FTAG);
+
+ return (err);
+}
+#endif /* _KERNEL */
/*
* Allocate a loaned anonymous arc buffer.
arc_buf_t *
dmu_request_arcbuf(dmu_buf_t *handle, int size)
{
- dnode_t *dn = ((dmu_buf_impl_t *)handle)->db_dnode;
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)handle;
+ spa_t *spa;
- return (arc_loan_buf(dn->dn_objset->os_spa, size));
+ DB_GET_SPA(&spa, db);
+ return (arc_loan_buf(spa, size));
}
/*
dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, arc_buf_t *buf,
dmu_tx_t *tx)
{
- dnode_t *dn = ((dmu_buf_impl_t *)handle)->db_dnode;
+ dmu_buf_impl_t *dbuf = (dmu_buf_impl_t *)handle;
+ dnode_t *dn;
dmu_buf_impl_t *db;
uint32_t blksz = (uint32_t)arc_buf_size(buf);
uint64_t blkid;
+ DB_DNODE_ENTER(dbuf);
+ dn = DB_DNODE(dbuf);
rw_enter(&dn->dn_struct_rwlock, RW_READER);
blkid = dbuf_whichblock(dn, offset);
VERIFY((db = dbuf_hold(dn, blkid, FTAG)) != NULL);
rw_exit(&dn->dn_struct_rwlock);
+ DB_DNODE_EXIT(dbuf);
if (offset == db->db.db_offset && blksz == db->db.db_size) {
dbuf_assign_arcbuf(db, buf, tx);
dbuf_rele(db, FTAG);
} else {
+ objset_t *os;
+ uint64_t object;
+
+ DB_DNODE_ENTER(dbuf);
+ dn = DB_DNODE(dbuf);
+ os = dn->dn_objset;
+ object = dn->dn_object;
+ DB_DNODE_EXIT(dbuf);
+
dbuf_rele(db, FTAG);
- ASSERT(dn->dn_objset->os.os == dn->dn_objset);
- dmu_write(&dn->dn_objset->os, dn->dn_object, offset, blksz,
- buf->b_data, tx);
+ dmu_write(os, object, offset, blksz, buf->b_data, tx);
dmu_return_arcbuf(buf);
+ XUIOSTAT_BUMP(xuiostat_wbuf_copied);
}
}
typedef struct {
- dbuf_dirty_record_t *dr;
- dmu_sync_cb_t *done;
- void *arg;
+ dbuf_dirty_record_t *dsa_dr;
+ dmu_sync_cb_t *dsa_done;
+ zgd_t *dsa_zgd;
+ dmu_tx_t *dsa_tx;
} dmu_sync_arg_t;
/* ARGSUSED */
static void
dmu_sync_ready(zio_t *zio, arc_buf_t *buf, void *varg)
{
+ dmu_sync_arg_t *dsa = varg;
+ dmu_buf_t *db = dsa->dsa_zgd->zgd_db;
blkptr_t *bp = zio->io_bp;
- if (!BP_IS_HOLE(bp)) {
- dmu_sync_arg_t *in = varg;
- dbuf_dirty_record_t *dr = in->dr;
- dmu_buf_impl_t *db = dr->dr_dbuf;
- ASSERT(BP_GET_TYPE(bp) == db->db_dnode->dn_type);
- ASSERT(BP_GET_LEVEL(bp) == 0);
- bp->blk_fill = 1;
+ if (zio->io_error == 0) {
+ if (BP_IS_HOLE(bp)) {
+ /*
+ * A block of zeros may compress to a hole, but the
+ * block size still needs to be known for replay.
+ */
+ BP_SET_LSIZE(bp, db->db_size);
+ } else {
+ ASSERT(BP_GET_LEVEL(bp) == 0);
+ bp->blk_fill = 1;
+ }
}
}
+static void
+dmu_sync_late_arrival_ready(zio_t *zio)
+{
+ dmu_sync_ready(zio, NULL, zio->io_private);
+}
+
/* 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_sync_arg_t *dsa = varg;
+ dbuf_dirty_record_t *dr = dsa->dsa_dr;
dmu_buf_impl_t *db = dr->dr_dbuf;
- dmu_sync_cb_t *done = in->done;
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;
+ if (zio->io_error == 0) {
+ dr->dt.dl.dr_overridden_by = *zio->io_bp;
+ dr->dt.dl.dr_override_state = DR_OVERRIDDEN;
+ dr->dt.dl.dr_copies = zio->io_prop.zp_copies;
+ if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by))
+ BP_ZERO(&dr->dt.dl.dr_overridden_by);
+ } else {
+ dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
+ }
cv_broadcast(&db->db_changed);
mutex_exit(&db->db_mtx);
- if (done)
- done(&(db->db), in->arg);
+ dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
- kmem_free(in, sizeof (dmu_sync_arg_t));
+ kmem_free(dsa, sizeof (*dsa));
+}
+
+static void
+dmu_sync_late_arrival_done(zio_t *zio)
+{
+ blkptr_t *bp = zio->io_bp;
+ dmu_sync_arg_t *dsa = zio->io_private;
+
+ if (zio->io_error == 0 && !BP_IS_HOLE(bp)) {
+ ASSERT(zio->io_bp->blk_birth == zio->io_txg);
+ ASSERT(zio->io_txg > spa_syncing_txg(zio->io_spa));
+ zio_free(zio->io_spa, zio->io_txg, zio->io_bp);
+ }
+
+ dmu_tx_commit(dsa->dsa_tx);
+
+ dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
+
+ kmem_free(dsa, sizeof (*dsa));
+}
+
+static int
+dmu_sync_late_arrival(zio_t *pio, objset_t *os, dmu_sync_cb_t *done, zgd_t *zgd,
+ zio_prop_t *zp, zbookmark_t *zb)
+{
+ dmu_sync_arg_t *dsa;
+ dmu_tx_t *tx;
+
+ tx = dmu_tx_create(os);
+ dmu_tx_hold_space(tx, zgd->zgd_db->db_size);
+ if (dmu_tx_assign(tx, TXG_WAIT) != 0) {
+ dmu_tx_abort(tx);
+ return (EIO); /* Make zl_get_data do txg_waited_synced() */
+ }
+
+ dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_PUSHPAGE);
+ dsa->dsa_dr = NULL;
+ dsa->dsa_done = done;
+ dsa->dsa_zgd = zgd;
+ dsa->dsa_tx = tx;
+
+ zio_nowait(zio_write(pio, os->os_spa, dmu_tx_get_txg(tx), zgd->zgd_bp,
+ zgd->zgd_db->db_data, zgd->zgd_db->db_size, zp,
+ dmu_sync_late_arrival_ready, dmu_sync_late_arrival_done, dsa,
+ ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL | ZIO_FLAG_FASTWRITE, zb));
+
+ return (0);
}
/*
* 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.
+ * EIO: could not do the I/O.
+ * The caller should do a txg_wait_synced().
*
- * 0: completed. Sets *bp to the blkptr just written.
- * The caller should log this blkptr immediately.
+ * 0: the I/O has been initiated.
+ * The caller should log this blkptr in the done callback.
+ * It is possible that the I/O will fail, in which case
+ * the error will be reported to the done callback and
+ * propagated to pio from zio_done().
*/
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_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd)
{
- 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;
+ blkptr_t *bp = zgd->zgd_bp;
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)zgd->zgd_db;
+ objset_t *os = db->db_objset;
+ dsl_dataset_t *ds = os->os_dsl_dataset;
dbuf_dirty_record_t *dr;
- dmu_sync_arg_t *in;
+ dmu_sync_arg_t *dsa;
zbookmark_t zb;
- writeprops_t wp = { 0 };
- zio_t *zio;
- int err;
+ zio_prop_t zp;
+ dnode_t *dn;
+ ASSERT(pio != NULL);
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);
+ SET_BOOKMARK(&zb, ds->ds_object,
+ db->db.db_object, db->db_level, db->db_blkid);
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
+ dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC, &zp);
+ DB_DNODE_EXIT(db);
/*
- * XXX - would be nice if we could do this without suspending...
+ * If we're frozen (running ziltest), we always need to generate a bp.
*/
- txg_suspend(dp);
+ if (txg > spa_freeze_txg(os->os_spa))
+ return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
/*
- * If this txg already synced, there's nothing to do.
+ * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
+ * and us. If we determine that this txg is not yet syncing,
+ * but it begins to sync a moment later, that's OK because the
+ * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
*/
- if (txg <= tx->tx_synced_txg) {
- txg_resume(dp);
+ mutex_enter(&db->db_mtx);
+
+ if (txg <= spa_last_synced_txg(os->os_spa)) {
/*
- * If we're running ziltest, we need the blkptr regardless.
+ * This txg has already synced. There's nothing to do.
*/
- 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);
- }
+ mutex_exit(&db->db_mtx);
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);
- }
+ if (txg <= spa_syncing_txg(os->os_spa)) {
+ /*
+ * This txg is currently syncing, so we can't mess with
+ * the dirty record anymore; just write a new log block.
+ */
+ mutex_exit(&db->db_mtx);
+ return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
}
dr = db->db_last_dirty;
- while (dr && dr->dr_txg > txg)
+ while (dr && dr->dr_txg != txg)
dr = dr->dr_next;
- if (dr == NULL || dr->dr_txg < txg) {
+
+ if (dr == NULL) {
/*
- * This dbuf isn't dirty, must have been free_range'd.
+ * There's no dr for this dbuf, so it must have been freed.
* 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) {
+ if (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC ||
+ dr->dt.dl.dr_override_state == DR_OVERRIDDEN) {
/*
- * 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
+ * We have already issued a sync write for this buffer,
+ * or 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);
+ return (EALREADY);
}
+ ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN);
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;
+ dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_PUSHPAGE);
+ dsa->dsa_dr = dr;
+ dsa->dsa_done = done;
+ dsa->dsa_zgd = zgd;
+ dsa->dsa_tx = NULL;
- wp.wp_type = db->db_dnode->dn_type;
- wp.wp_level = db->db_level;
- wp.wp_copies = os->os_copies;
- wp.wp_dnchecksum = db->db_dnode->dn_checksum;
- wp.wp_oschecksum = os->os_checksum;
- wp.wp_dncompress = db->db_dnode->dn_compress;
- wp.wp_oscompress = os->os_compress;
+ zio_nowait(arc_write(pio, os->os_spa, txg,
+ bp, dr->dt.dl.dr_data, DBUF_IS_L2CACHEABLE(db),
+ DBUF_IS_L2COMPRESSIBLE(db), &zp, dmu_sync_ready, dmu_sync_done,
+ dsa, ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL | ZIO_FLAG_FASTWRITE, &zb));
- ASSERT(BP_IS_HOLE(bp));
-
- zio = arc_write(pio, os->os_spa, &wp, DBUF_IS_L2CACHEABLE(db),
- txg, bp, dr->dt.dl.dr_data, dmu_sync_ready, dmu_sync_done, in,
- ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
- if (pio) {
- zio_nowait(zio);
- err = EINPROGRESS;
- } else {
- err = zio_wait(zio);
- ASSERT(err == 0);
- }
- return (err);
+ return (0);
}
int
dnode_t *dn;
int err;
- err = dnode_hold(os->os, object, FTAG, &dn);
+ err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
err = dnode_set_blksz(dn, size, ibs, tx);
dnode_t *dn;
/* XXX assumes dnode_hold will not get an i/o error */
- (void) dnode_hold(os->os, object, FTAG, &dn);
+ (void) dnode_hold(os, object, FTAG, &dn);
ASSERT(checksum < ZIO_CHECKSUM_FUNCTIONS);
dn->dn_checksum = checksum;
dnode_setdirty(dn, tx);
dnode_t *dn;
/* XXX assumes dnode_hold will not get an i/o error */
- (void) dnode_hold(os->os, object, FTAG, &dn);
+ (void) dnode_hold(os, object, FTAG, &dn);
ASSERT(compress < ZIO_COMPRESS_FUNCTIONS);
dn->dn_compress = compress;
dnode_setdirty(dn, tx);
dnode_rele(dn, FTAG);
}
+int zfs_mdcomp_disable = 0;
+
+void
+dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, zio_prop_t *zp)
+{
+ dmu_object_type_t type = dn ? dn->dn_type : DMU_OT_OBJSET;
+ boolean_t ismd = (level > 0 || DMU_OT_IS_METADATA(type) ||
+ (wp & WP_SPILL));
+ enum zio_checksum checksum = os->os_checksum;
+ enum zio_compress compress = os->os_compress;
+ enum zio_checksum dedup_checksum = os->os_dedup_checksum;
+ boolean_t dedup;
+ boolean_t dedup_verify = os->os_dedup_verify;
+ int copies = os->os_copies;
+
+ /*
+ * Determine checksum setting.
+ */
+ if (ismd) {
+ /*
+ * Metadata always gets checksummed. If the data
+ * checksum is multi-bit correctable, and it's not a
+ * ZBT-style checksum, then it's suitable for metadata
+ * as well. Otherwise, the metadata checksum defaults
+ * to fletcher4.
+ */
+ if (zio_checksum_table[checksum].ci_correctable < 1 ||
+ zio_checksum_table[checksum].ci_eck)
+ checksum = ZIO_CHECKSUM_FLETCHER_4;
+ } else {
+ checksum = zio_checksum_select(dn->dn_checksum, checksum);
+ }
+
+ /*
+ * Determine compression setting.
+ */
+ if (ismd) {
+ /*
+ * XXX -- we should design a compression algorithm
+ * that specializes in arrays of bps.
+ */
+ compress = zfs_mdcomp_disable ? ZIO_COMPRESS_EMPTY :
+ ZIO_COMPRESS_LZJB;
+ } else {
+ compress = zio_compress_select(dn->dn_compress, compress);
+ }
+
+ /*
+ * Determine dedup setting. If we are in dmu_sync(), we won't
+ * actually dedup now because that's all done in syncing context;
+ * but we do want to use the dedup checkum. If the checksum is not
+ * strong enough to ensure unique signatures, force dedup_verify.
+ */
+ dedup = (!ismd && dedup_checksum != ZIO_CHECKSUM_OFF);
+ if (dedup) {
+ checksum = dedup_checksum;
+ if (!zio_checksum_table[checksum].ci_dedup)
+ dedup_verify = 1;
+ }
+
+ if (wp & WP_DMU_SYNC)
+ dedup = 0;
+
+ if (wp & WP_NOFILL) {
+ ASSERT(!ismd && level == 0);
+ checksum = ZIO_CHECKSUM_OFF;
+ compress = ZIO_COMPRESS_OFF;
+ dedup = B_FALSE;
+ }
+
+ zp->zp_checksum = checksum;
+ zp->zp_compress = compress;
+ zp->zp_type = (wp & WP_SPILL) ? dn->dn_bonustype : type;
+ zp->zp_level = level;
+ zp->zp_copies = MIN(copies + ismd, spa_max_replication(os->os_spa));
+ zp->zp_dedup = dedup;
+ zp->zp_dedup_verify = dedup && dedup_verify;
+}
+
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);
+ err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
/*
if (i != TXG_SIZE) {
dnode_rele(dn, FTAG);
txg_wait_synced(dmu_objset_pool(os), 0);
- err = dnode_hold(os->os, object, FTAG, &dn);
+ err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
}
void
dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
{
+ dnode_phys_t *dnp;
+ int i;
+
rw_enter(&dn->dn_struct_rwlock, RW_READER);
mutex_enter(&dn->dn_mtx);
+ dnp = dn->dn_phys;
+
doi->doi_data_block_size = dn->dn_datablksz;
doi->doi_metadata_block_size = dn->dn_indblkshift ?
1ULL << dn->dn_indblkshift : 0;
+ doi->doi_type = dn->dn_type;
+ doi->doi_bonus_type = dn->dn_bonustype;
+ doi->doi_bonus_size = dn->dn_bonuslen;
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;
+ doi->doi_physical_blocks_512 = (DN_USED_BYTES(dnp) + 256) >> 9;
+ doi->doi_max_offset = (dnp->dn_maxblkid + 1) * dn->dn_datablksz;
+ doi->doi_fill_count = 0;
+ for (i = 0; i < dnp->dn_nblkptr; i++)
+ doi->doi_fill_count += dnp->dn_blkptr[i].blk_fill;
mutex_exit(&dn->dn_mtx);
rw_exit(&dn->dn_struct_rwlock);
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);
+ int err = dnode_hold(os, object, FTAG, &dn);
if (err)
return (err);
* 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_db(dmu_buf_t *db_fake, dmu_object_info_t *doi)
{
- dmu_object_info_from_dnode(((dmu_buf_impl_t *)db)->db_dnode, doi);
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
+
+ DB_DNODE_ENTER(db);
+ dmu_object_info_from_dnode(DB_DNODE(db), doi);
+ DB_DNODE_EXIT(db);
}
/*
* This is specifically optimized for zfs_getattr().
*/
void
-dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, u_longlong_t *nblk512)
+dmu_object_size_from_db(dmu_buf_t *db_fake, uint32_t *blksize,
+ u_longlong_t *nblk512)
{
- dnode_t *dn = ((dmu_buf_impl_t *)db)->db_dnode;
+ dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
+ dnode_t *dn;
+
+ DB_DNODE_ENTER(db);
+ dn = DB_DNODE(db);
*blksize = dn->dn_datablksz;
/* add 1 for dnode space */
*nblk512 = ((DN_USED_BYTES(dn->dn_phys) + SPA_MINBLOCKSIZE/2) >>
SPA_MINBLOCKSHIFT) + 1;
+ DB_DNODE_EXIT(db);
}
void
void
dmu_init(void)
{
- dbuf_init();
+ zfs_dbgmsg_init();
+ sa_cache_init();
+ xuio_stat_init();
+ dmu_objset_init();
dnode_init();
- arc_init();
+ dbuf_init();
+ zfetch_init();
+ dmu_tx_init();
l2arc_init();
+ arc_init();
}
void
dmu_fini(void)
{
arc_fini();
- dnode_fini();
- dbuf_fini();
l2arc_fini();
+ dmu_tx_fini();
+ zfetch_fini();
+ dbuf_fini();
+ dnode_fini();
+ dmu_objset_fini();
+ xuio_stat_fini();
+ sa_cache_fini();
+ zfs_dbgmsg_fini();
}
+
+#if defined(_KERNEL) && defined(HAVE_SPL)
+EXPORT_SYMBOL(dmu_bonus_hold);
+EXPORT_SYMBOL(dmu_buf_hold_array_by_bonus);
+EXPORT_SYMBOL(dmu_buf_rele_array);
+EXPORT_SYMBOL(dmu_prefetch);
+EXPORT_SYMBOL(dmu_free_range);
+EXPORT_SYMBOL(dmu_free_long_range);
+EXPORT_SYMBOL(dmu_free_object);
+EXPORT_SYMBOL(dmu_read);
+EXPORT_SYMBOL(dmu_write);
+EXPORT_SYMBOL(dmu_prealloc);
+EXPORT_SYMBOL(dmu_object_info);
+EXPORT_SYMBOL(dmu_object_info_from_dnode);
+EXPORT_SYMBOL(dmu_object_info_from_db);
+EXPORT_SYMBOL(dmu_object_size_from_db);
+EXPORT_SYMBOL(dmu_object_set_blocksize);
+EXPORT_SYMBOL(dmu_object_set_checksum);
+EXPORT_SYMBOL(dmu_object_set_compress);
+EXPORT_SYMBOL(dmu_write_policy);
+EXPORT_SYMBOL(dmu_sync);
+EXPORT_SYMBOL(dmu_request_arcbuf);
+EXPORT_SYMBOL(dmu_return_arcbuf);
+EXPORT_SYMBOL(dmu_assign_arcbuf);
+EXPORT_SYMBOL(dmu_buf_hold);
+EXPORT_SYMBOL(dmu_ot);
+
+module_param(zfs_mdcomp_disable, int, 0644);
+MODULE_PARM_DESC(zfs_mdcomp_disable, "Disable meta data compression");
+#endif
git://git.camperquake.de / zfs.git / blobdiff