diff options
Diffstat (limited to 'module/zfs/dmu.c')
| -rw-r--r-- | module/zfs/dmu.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c index e1dfb41ff..6ed4743ee 100644 --- a/module/zfs/dmu.c +++ b/module/zfs/dmu.c @@ -128,6 +128,26 @@ const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS] = { }; int +dmu_buf_hold_noread_by_dnode(dnode_t *dn, uint64_t offset, + void *tag, dmu_buf_t **dbp) +{ + uint64_t blkid; + dmu_buf_impl_t *db; + + blkid = dbuf_whichblock(dn, 0, offset); + rw_enter(&dn->dn_struct_rwlock, RW_READER); + db = dbuf_hold(dn, blkid, tag); + rw_exit(&dn->dn_struct_rwlock); + + if (db == NULL) { + *dbp = NULL; + return (SET_ERROR(EIO)); + } + + *dbp = &db->db; + return (0); +} +int dmu_buf_hold_noread(objset_t *os, uint64_t object, uint64_t offset, void *tag, dmu_buf_t **dbp) { @@ -155,6 +175,29 @@ dmu_buf_hold_noread(objset_t *os, uint64_t object, uint64_t offset, } int +dmu_buf_hold_by_dnode(dnode_t *dn, uint64_t offset, + void *tag, dmu_buf_t **dbp, int flags) +{ + int err; + int db_flags = DB_RF_CANFAIL; + + if (flags & DMU_READ_NO_PREFETCH) + db_flags |= DB_RF_NOPREFETCH; + + err = dmu_buf_hold_noread_by_dnode(dn, offset, tag, dbp); + if (err == 0) { + dmu_buf_impl_t *db = (dmu_buf_impl_t *)(*dbp); + err = dbuf_read(db, NULL, db_flags); + if (err != 0) { + dbuf_rele(db, tag); + *dbp = NULL; + } + } + + return (err); +} + +int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, void *tag, dmu_buf_t **dbp, int flags) { |