diff options
Diffstat (limited to 'module/zfs/dmu.c')
| -rw-r--r-- | module/zfs/dmu.c | 74 |
1 files changed, 70 insertions, 4 deletions
diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c index 81f434380..7e8328e77 100644 --- a/module/zfs/dmu.c +++ b/module/zfs/dmu.c @@ -1199,8 +1199,8 @@ dmu_write_req(objset_t *os, uint64_t object, struct request *req, dmu_tx_t *tx) return (err); } -int -dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) +static int +dmu_read_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size) { dmu_buf_t **dbp; int numbufs, i, err; @@ -1210,8 +1210,8 @@ dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) * 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_by_dnode(dn, uio->uio_loffset, size, + TRUE, FTAG, &numbufs, &dbp, 0); if (err) return (err); @@ -1253,6 +1253,58 @@ dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) return (err); } +/* + * Read 'size' bytes into the uio buffer. + * From object zdb->db_object. + * Starting at offset uio->uio_loffset. + * + * If the caller already has a dbuf in the target object + * (e.g. its bonus buffer), this routine is faster than dmu_read_uio(), + * because we don't have to find the dnode_t for the object. + */ +int +dmu_read_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size) +{ + 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_read_uio_dnode(dn, uio, size); + DB_DNODE_EXIT(db); + + return (err); +} + +/* + * Read 'size' bytes into the uio buffer. + * From the specified object + * Starting at offset uio->uio_loffset. + */ +int +dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) +{ + dnode_t *dn; + int err; + + if (size == 0) + return (0); + + err = dnode_hold(os, object, FTAG, &dn); + if (err) + return (err); + + err = dmu_read_uio_dnode(dn, uio, size); + + dnode_rele(dn, FTAG); + + return (err); +} + static int dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx) { @@ -1305,6 +1357,15 @@ dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx) return (err); } +/* + * Write 'size' bytes from the uio buffer. + * To object zdb->db_object. + * Starting at offset uio->uio_loffset. + * + * If the caller already has a dbuf in the target object + * (e.g. its bonus buffer), this routine is faster than dmu_write_uio(), + * because we don't have to find the dnode_t for the object. + */ int dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size, dmu_tx_t *tx) @@ -1324,6 +1385,11 @@ dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size, return (err); } +/* + * Write 'size' bytes from the uio buffer. + * To the specified object. + * Starting at offset uio->uio_loffset. + */ int dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size, dmu_tx_t *tx) |