void zfs_sa_symlink(znode_t *zp, char *link, int len, dmu_tx_t *tx) { dmu_buf_t *db = sa_get_db(zp->z_sa_hdl); if (ZFS_OLD_ZNODE_PHYS_SIZE + len <= dmu_bonus_max()) { VERIFY(dmu_set_bonus(db, len + ZFS_OLD_ZNODE_PHYS_SIZE, tx) == 0); if (len) { bcopy(link, (caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE, len); } } else { dmu_buf_t *dbp; zfs_grow_blocksize(zp, len, tx); VERIFY(0 == dmu_buf_hold(zp->z_zfsvfs->z_os, zp->z_id, 0, FTAG, &dbp, DMU_READ_NO_PREFETCH)); dmu_buf_will_dirty(dbp, tx); ASSERT3U(len, <=, dbp->db_size); bcopy(link, dbp->db_data, len); dmu_buf_rele(dbp, FTAG); } }
/* * Increase the file length * * IN: zp - znode of file to free data in. * end - new end-of-file * * RETURN: 0 on success, error code on failure */ static int zfs_extend(znode_t *zp, uint64_t end) { zfs_sb_t *zsb = ZTOZSB(zp); dmu_tx_t *tx; rl_t *rl; uint64_t newblksz; int error; /* * We will change zp_size, lock the whole file. */ rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); /* * Nothing to do if file already at desired length. */ if (end <= zp->z_size) { zfs_range_unlock(rl); return (0); } tx = dmu_tx_create(zsb->z_os); dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); zfs_sa_upgrade_txholds(tx, zp); if (end > zp->z_blksz && (!ISP2(zp->z_blksz) || zp->z_blksz < zsb->z_max_blksz)) { /* * We are growing the file past the current block size. */ if (zp->z_blksz > ZTOZSB(zp)->z_max_blksz) { ASSERT(!ISP2(zp->z_blksz)); newblksz = MIN(end, SPA_MAXBLOCKSIZE); } else { newblksz = MIN(end, ZTOZSB(zp)->z_max_blksz); } dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); } else { newblksz = 0; } error = dmu_tx_assign(tx, TXG_WAIT); if (error) { dmu_tx_abort(tx); zfs_range_unlock(rl); return (error); } if (newblksz) zfs_grow_blocksize(zp, newblksz, tx); zp->z_size = end; VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(ZTOZSB(zp)), &zp->z_size, sizeof (zp->z_size), tx)); zfs_range_unlock(rl); dmu_tx_commit(tx); return (0); }